WO2012017575A1

WO2012017575A1 - Air conditioner

Info

Publication number: WO2012017575A1
Application number: PCT/JP2011/002005
Authority: WO
Inventors: 聡道籏; 山田　彰二; 智哉福井; 健一迫田; 加賀　邦彦; 森　剛; 仁一鈴木; 輝高守; 琢也向山; 代田　光宏; 谷川　喜則
Original assignee: 三菱電機株式会社
Priority date: 2010-08-04
Filing date: 2011-04-04
Publication date: 2012-02-09
Also published as: JP5430763B2; EP2602566A1; CN103052851A; CN103052851B; JPWO2012017575A1; EP2602566A4

Abstract

Provided is an air conditioner which produces less noise. The indoor unit (100) of an air conditioner is provided with: a casing (1) having a suction opening (2) which is formed in the upper part thereof and also having a discharge opening (3) which is formed on the lower side of the front surface thereof; axial-flow or mixed-flow fans (20) provided side by side downstream of the suction opening (2); a heat exchanger (50) provided at a position downstream of the fans (20) and upstream of the discharge opening (3); noise detection microphones (161, 162) for detecting the noise emitted from the fans (20); control speakers (181, 182) for outputting a control sound for reducing the noise; noise deadening effect detection microphones (191, 192) for detecting the noise deadening effect achieved by the control sound; signal processing devices (201, 202) for causing the control speakers (181, 182) to output the control sound on the basis of the result of the detection by the noise detection microphones (161, 162) and by the noise deadening effect detection microphones (191, 192); and a control device (281) for individually controlling the rotational speed of the fans.

Description

Air conditioner

The present invention relates to an air conditioner in which a fan and a heat exchanger are housed in a casing, and relates to an air conditioner including a silencer unit (speaker and microphone) for silencing sound generated by the fan. is there.

Conventionally, there exists an air conditioner in which a fan and a heat exchanger are housed in a casing. As such, “an air conditioner comprising a main body casing having an air inlet and an air outlet, and a heat exchanger disposed in the main body casing, wherein the air outlet includes a plurality of small propellers. There has been proposed an “air conditioner in which a fan unit having a fan arranged in the width direction of the air outlet is disposed” (see, for example, Patent Document 1). This air conditioner is provided with a fan unit at the air outlet to facilitate airflow direction control, and a fan unit having the same configuration is also provided at the suction port to improve the heat exchanger performance due to an increase in the air volume. I am doing so.

Japanese Patent Laying-Open No. 2005-3244 (paragraphs 0012, 0013, 0018 to 0021, FIGS. 5 and 6)

The air conditioner like patent document 1 is provided with the heat exchanger in the upstream of the fan unit (blower). For this reason, since the movable fan unit is provided on the air outlet side, the air flow is changed due to the movement of the fan and the instability of the flow due to the asymmetric suction causes a decrease in the air volume and a reverse flow. Furthermore, the air whose flow is disturbed flows into the fan unit.
Therefore, in an air conditioner like Patent Document 1, the flow of air flowing into the outer peripheral part of the wing part (propeller) of the fan unit whose flow rate is high is disturbed, and the fan unit itself becomes a noise source (noise deterioration). There was a problem that

Therefore, in order to solve the above-mentioned problem, the applicant has described, “A casing in which a suction port is formed in the upper part and a blower outlet is formed in the lower part of the front part, and an axial flow provided on the downstream side of the suction port in the casing. Type or mixed flow type blower and air provided on the downstream side of the blower in the casing and upstream of the blower outlet, and a heat exchanger for exchanging heat between the air blown from the blower and the refrigerant An international application has been filed for “indoor unit of harmony machine” (international application number PCT / JP2009 / 67265).

The present invention provides an air conditioner that can further suppress noise by providing a silencer unit (speaker and microphone) at a suitable position of an air conditioner equipped with an axial flow type or mixed flow type blower (fan). The aim is to get a chance.

The air conditioner according to the present invention has a casing in which an inlet is formed in the upper part and an outlet is formed in the lower part of the front surface, and a plurality of axial flow types provided in parallel on the downstream side of the inlet in the casing or A mixed flow type fan, a heat exchanger provided downstream of the fan in the casing and upstream of the air outlet, and heat exchanged between the air blown out from the fan and the refrigerant and radiated from the fan The detection results of the noise detection device for detecting noise, the control sound output device for outputting the control sound for reducing the noise, the silencing effect detection device for detecting the silencing effect by the control sound, and the noise detection device and the silencing effect detection device An air conditioner comprising: a control sound generation device that outputs a control sound to a control sound output device; and a control device that individually controls the rotational speed for a plurality of fans. Radiated from Based on the silencing effect when causing interference control tone to sound, and controls the rotational speed of the plurality of fans.

Further, the air conditioner according to the present invention has a casing in which a suction port is formed in the upper part and a blower outlet is formed in the lower part of the front surface, and a plurality of axial flows provided in parallel on the downstream side of the suction port in the casing. Type or mixed flow type fan, a heat exchanger provided on the downstream side of the fan in the casing and upstream of the outlet, and for exchanging heat between the air blown from the fan and the refrigerant, and radiation from the fan Based on the detection result of the control sound output device that outputs the control sound that reduces the generated noise, the noise / silence effect detection device that detects the noise and detects the silencing effect of the control sound, and the noise / silence effect detection device An air conditioner comprising: a control sound generating device that outputs a control sound to a control sound output device; and a control device that individually controls the rotational speed of a plurality of fans. Against radiated noise Based on the silencing effect when caused to interfere the control sound Te, and controls the rotational speed of the plurality of fans.

Further, the air conditioner according to the present invention has a casing in which a suction port is formed in the upper part and a blower outlet is formed in the lower part of the front surface, and a plurality of axial flows provided in parallel on the downstream side of the suction port in the casing. Type or mixed flow type fan, a heat exchanger provided on the downstream side of the fan in the casing and upstream of the outlet, and for exchanging heat between the air blown from the fan and the refrigerant, and radiation from the fan Detection device for detecting generated noise, control sound output device for outputting control sound for reducing noise, silence effect detection device for detecting silence effect by control sound, detection of noise detection device and silence effect detection device Based on the result, a control sound generating device that outputs a control sound to the control sound output device, and a control device that individually controls the rotational speed for a plurality of fans, the control devices are arranged at both ends of the casing. Fan Rotational speed control to increase the rotational speed, and is performed at least one of the rotational speed control of the rotational speed control to decrease the rotational speed of the fan than fan disposed at opposite ends of the casing.

Further, the air conditioner according to the present invention has a casing in which a suction port is formed in the upper part and a blower outlet is formed in the lower part of the front surface, and a plurality of axial flows provided in parallel on the downstream side of the suction port in the casing. Type or mixed flow type fan, a heat exchanger provided on the downstream side of the fan in the casing and upstream of the outlet, and for exchanging heat between the air blown from the fan and the refrigerant, and radiation from the fan Based on the detection result of the control sound output device that outputs the control sound that reduces the generated noise, the noise / silence effect detection device that detects the noise and detects the silencing effect of the control sound, and the noise / silence effect detection device A control sound generation device that outputs a control sound to the control sound output device, and a control device that individually controls the rotational speed of the plurality of fans, and the control device includes fans disposed at both ends of the casing. Increase rotation speed That the rotation speed control, and is performed at least one of the rotational speed control of the rotational speed control to decrease the rotational speed of the fan than fan disposed at opposite ends of the casing.

The air conditioner according to the present invention includes a “noise reduction device including a noise detection device, a control sound output device, a noise reduction effect detection device, and a control sound generation device”, or “a control sound output device, a noise / noise reduction effect detection device, and A muffler mechanism including a control sound generator is provided. Furthermore, the air conditioner according to the present invention includes a plurality of blower fans and a control device that individually controls the rotational speed of the blower fans. For this reason, the noise of an air conditioner can be reduced by controlling the rotation speed of each blower fan based on the silencing effect.

It is a longitudinal cross-sectional view which shows the indoor unit of the air conditioner which concerns on Embodiment 1 of this invention. It is an external appearance perspective view which shows the indoor unit of the air conditioner which concerns on Embodiment 1 of this invention. It is the perspective view which looked at the indoor unit which concerns on Embodiment 1 of this invention from the front right side. It is the perspective view which looked at the indoor unit which concerns on Embodiment 1 of this invention from the back right side. It is the perspective view which looked at the indoor unit which concerns on Embodiment 1 of this invention from the front left side. It is a perspective view which shows the drain pan which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the dew condensation generation | occurrence | production position of the indoor unit which concerns on Embodiment 1 of this invention. It is a block diagram which shows the signal processing apparatus which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows another example of the indoor unit of the air conditioner which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the indoor unit which concerns on Embodiment 2 of this invention. It is a block diagram which shows the signal processing apparatus which concerns on Embodiment 2 of this invention. It is a wave form diagram for demonstrating the method of calculating the noise which wants to mute from the sound after interference. It is a block diagram for demonstrating the method of estimating the control sound of Embodiment 2 of this invention. It is a longitudinal cross-sectional view which shows another example of the indoor unit which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional view which shows the indoor unit which concerns on Embodiment 3 of this invention. It is the characteristic figure which showed the coherence characteristic between both microphones by the installation position of a noise detection microphone and a silencing effect detection microphone. It is a longitudinal cross-sectional view which shows the indoor unit which concerns on Embodiment 4 of this invention. It is a longitudinal cross-sectional view which shows the indoor unit which concerns on Embodiment 5 of this invention. It is a bottom view (figure seen from the lower side of Drawing 18) of a fan concerning Embodiment 5 of the present invention. FIG. 20 is a cross-sectional view taken along the line MM in FIG. It is a block diagram which shows the signal processing apparatus which concerns on Embodiment 5 of this invention. It is a figure of the experimental result which visualized the airflow which blows off from the fan in Embodiment 5 of this invention. It is a block diagram which shows the circuit of the weighting means which concerns on Embodiment 5 of this invention. This is a coherence characteristic between the detection sound of the noise detection microphone 161 and the detection sound of the mute effect detection microphone 191 when the noise detection microphone 161 is installed outside the cylindrical region S and the fan 20 is operated. This is a coherence characteristic between the detection sound of the noise detection microphone 161 and the detection sound of the mute effect detection microphone 191 when the fan 20 is operated inside the cylindrical region S. It is a longitudinal cross-sectional view which shows another example of the indoor unit which concerns on Embodiment 5 of this invention. It is a longitudinal cross-sectional view which shows another example of the indoor unit which concerns on Embodiment 5 of this invention. It is sectional drawing which shows another example of attachment of the noise detection microphone in Embodiment 5 of this invention. It is a longitudinal cross-sectional view which shows the indoor unit which concerns on Embodiment 6 of this invention. It is a longitudinal cross-sectional view which shows another example of the indoor unit which concerns on Embodiment 6 of this invention. It is a longitudinal cross-sectional view which shows another example of the indoor unit which concerns on Embodiment 6 of this invention. It is sectional drawing which shows another example of attachment of the noise detection microphone in this Embodiment 6. It is a longitudinal cross-sectional view which shows the indoor unit which concerns on Embodiment 7 of this invention. It is a block diagram which shows the signal processing apparatus which concerns on Embodiment 7 of this invention. It is a front view which shows the indoor unit which concerns on Embodiment 8 of this invention. It is a side view which shows the indoor unit which concerns on Embodiment 8 of this invention. It is a block diagram which shows the control apparatus which concerns on Embodiment 8 of this invention. It is a front view which shows another example of the indoor unit which concerns on Embodiment 8 of this invention. It is a left view of the indoor unit shown in FIG. It is a front view of the indoor unit which concerns on Embodiment 9 of this invention. It is a block diagram which shows the control apparatus which concerns on Embodiment 9 of this invention. It is a front view which shows another example of the indoor unit which concerns on Embodiment 9 of this invention. It is a left view of the indoor unit shown in FIG. It is a front view which shows another example of the indoor unit which concerns on Embodiment 9 of this invention. It is a front view which shows the indoor unit which concerns on Embodiment 10 of this invention. It is a block diagram which shows the control apparatus which concerns on Embodiment 10 of this invention. It is a front view which shows the indoor unit which concerns on Embodiment 11 of this invention. It is a front view which shows another example of the indoor unit which concerns on Embodiment 11 of this invention. It is a left view of the indoor unit shown in FIG. It is a front view which shows the indoor unit which concerns on Embodiment 12 of this invention. It is a front view which shows another example of the indoor unit which concerns on Embodiment 12 of this invention. It is a left view of the indoor unit shown in FIG. It is a front view which shows another example of the indoor unit which concerns on Embodiment 12 of this invention. It is a front view which shows the indoor unit which concerns on Embodiment 15 of this invention. It is a block diagram which shows the control apparatus which concerns on Embodiment 15 of this invention. It is a block diagram which shows the silence volume calculation means which concerns on Embodiment 15 of this invention. It is a front view which shows the indoor unit which concerns on Embodiment 16 of this invention.

Hereinafter, specific embodiments of the air conditioner according to the present invention (more specifically, the indoor unit of the air conditioner) will be described. In the first embodiment, a basic configuration of each unit constituting the indoor unit of the air conditioner will be described. In the second and subsequent embodiments, the detailed configuration of each unit or another example will be described. In each of the following embodiments, the present invention will be described by taking a wall-mounted indoor unit as an example. In the drawings shown in each embodiment, the shape and size of each unit (or a constituent member of each unit) may be partially different.

Embodiment 1 FIG.
<Basic configuration>
FIG. 1 is a longitudinal sectional view showing an indoor unit (referred to as an indoor unit 100) of an air conditioner according to Embodiment 1 of the present invention. FIG. 2 is an external perspective view showing the indoor unit. In the first embodiment and the embodiments described later, the left side in FIG. 1 will be described as the front side of the indoor unit 100. Hereinafter, the configuration of the indoor unit 100 will be described with reference to FIGS. 1 and 2.

(overall structure)
The indoor unit 100 supplies conditioned air to an air-conditioning target area such as a room by using a refrigeration cycle that circulates a refrigerant. The indoor unit 100 is mainly accommodated in a casing 1 in which a suction port 2 for sucking indoor air into the interior and a blower outlet 3 for supplying conditioned air to an air-conditioning target area are formed. The fan 20 sucks room air from the suction port 2 and blows out the conditioned air from the blower outlet 3 and the air passage from the fan 20 to the blower outlet 3, and exchanges heat between the refrigerant and the room air for conditioned air. And a heat exchanger 50 for producing And the air path (arrow Z) is connected in the casing 1 by these components. The suction port 2 is formed in the upper part of the casing 1. The blower outlet 3 has an opening formed in the lower part of the casing 1 (more specifically, on the lower side of the front part of the casing 1). The fan 20 is disposed on the downstream side of the suction port 2 and on the upstream side of the heat exchanger 50, and is configured by, for example, an axial flow fan or a diagonal flow fan.

Further, the indoor unit 100 includes a control device 281 that controls the rotation speed of the fan 20 and the directions (angles) of the upper and lower vanes 70 and the left and right vanes, which will be described later. Note that the controller 281 may not be shown in the drawings shown in the first embodiment and each embodiment described later.

In the indoor unit 100 configured as described above, the fan 20 is provided on the upstream side of the heat exchanger 50, so that it is compared with a conventional air conditioner indoor unit in which the fan 20 is provided at the outlet 3. The generation of the swirling flow of the air blown from the outlet 3 and the variation in the wind speed distribution can be suppressed. For this reason, comfortable ventilation to an air-conditioning object area is attained. Further, since there is no complicated structure such as a fan at the air outlet 3, it is easy to take measures against condensation that occurs at the boundary between warm air and cold air during cooling operation. Furthermore, since the fan motor 30 is not exposed to cold air or warm air that is air-conditioned air, a long operating life can be provided.

(fan)
In general, an indoor unit of an air conditioner has a limited installation space, and thus often cannot have a large fan. For this reason, in order to obtain a desired air volume, a plurality of fans having an appropriate size are arranged in parallel. As shown in FIG. 2, the indoor unit 100 according to Embodiment 1 includes three fans 20 arranged in parallel along the longitudinal direction of the casing 1 (in other words, the longitudinal direction of the air outlet 3). Yes. In order to obtain a desired heat exchanging capacity in the dimensions of a current general air conditioner indoor unit, approximately two to four fans 20 are preferable. In the indoor unit according to the first embodiment, all the fans 20 are configured in the same shape, and almost the same amount of air flow can be obtained by all the fans 20 by operating all the operation rotational speeds equally.

By configuring in this way, the optimum fan design corresponding to the indoor unit 100 of various specifications can be achieved by combining the number, shape, size, and the like of the fans 20 according to the required air volume and the ventilation resistance inside the indoor unit 100. Is possible.

(Bellmouth)
In the indoor unit 100 according to the first embodiment, a bell mouth 5 on a duct is disposed around the fan 20. The bell mouth 5 is for smoothly guiding the intake and exhaust of air to the fan. As shown in FIG. 1, the bell mouth 5 according to the first embodiment has a substantially circular shape in plan view. In the longitudinal section, the bell mouth 5 according to the first embodiment has the following shape. The upper part 5a has a substantially arc shape whose end part widens upward. The central portion 5b is a straight portion where the diameter of the bell mouth is constant. The lower part 5c has a substantially arc shape whose end part extends downward. And the suction inlet 2 is formed in the edge part (arc part of the suction side) of the upper part 5a of the bellmouth 5. FIG.
The bell mouth 5 shown in FIG. 1 of the first embodiment has a duct shape configured higher than the height of the impeller of the fan 20, but is not limited thereto, and the height of the bell mouth 5 is not limited thereto. A semi-open bellmouth configured lower than the height of the impeller of the fan 20 may be used. Furthermore, the bell mouth 5 may not be provided with the straight portion 5b shown in FIG. 1 but may be constituted only by the

end portions

5a and 5c.

The bell mouth 5 may be formed integrally with the casing 1, for example, in order to reduce the number of parts and improve the strength. Further, for example, the bell mouth 5, the fan 20, the fan motor 30, and the like may be modularized, and the casing 1 may be attached and detached to improve maintenance.

In the first embodiment, the end of the upper portion 5a of the bell mouth 5 (arc portion on the suction side) is configured in a uniform shape with respect to the circumferential direction of the opening surface of the bell mouth 5. In other words, the bell mouth 5 has no structure such as a notch or a rib with respect to the rotation direction about the rotation axis 20a of the fan 20, and has a uniform shape having axial symmetry.

By configuring the bell mouth 5 in this way, the end of the upper portion 5a of the bell mouth 5 (the arc portion on the suction side) has a uniform shape with respect to the rotation of the fan 20. A uniform flow is realized as a flow. For this reason, the noise which generate | occur | produces by the drift of the suction flow of the fan 20 can be reduced.

(Partition plate)
As shown in FIG. 2, in the indoor unit 100 according to the first embodiment, a partition plate 90 is provided between adjacent fans 20. These partition plates 90 are installed between the heat exchanger 50 and the fan 20. That is, the air path between the heat exchanger 50 and the fan 20 is divided into a plurality of air paths (three in the first embodiment). Since the partition plate 90 is installed between the heat exchanger 50 and the fan 20, the end on the side in contact with the heat exchanger 50 has a shape along the heat exchanger 50. More specifically, as shown in FIG. 1, the heat exchanger 50 includes a longitudinal section from the front side to the rear side of the indoor unit 100 (that is, a longitudinal section when the indoor unit 100 is viewed from the right side. Are arranged in a substantially Λ shape. For this reason, the heat exchanger 50 side end part of the partition plate 90 is also substantially [Lambda] type.

The position of the end portion of the partition plate 90 on the fan 20 side may be determined as follows, for example. When the adjacent fans 20 are sufficiently separated from each other on the suction side so as not to affect each other, the end of the partition plate 90 on the fan 20 side may be extended to the outlet surface of the fan 20. However, when the adjacent fans 20 are close enough to influence each other on the suction side, and the shape of the end of the upper portion 5a of the bell mouth 5 (arc portion on the suction side) can be formed sufficiently large, The end of the plate 90 on the fan 20 side extends to the upstream side (suction side) of the fan 20 so as not to affect the adjacent air path (so that the adjacent fans 20 do not affect each other on the suction side). It may be extended.

Further, the partition plate 90 can be formed of various materials. For example, the partition plate 90 may be formed of a metal such as steel or aluminum. For example, the partition plate 90 may be formed of resin or the like. However, since the heat exchanger 50 becomes a high temperature during the heating operation, when the partition plate 90 is formed of a low melting point material such as a resin, the heat exchanger 50 is slightly between the partition plate 90 and the heat exchanger 50. A good space should be formed. When the partition plate 90 is made of a material having a high melting point such as aluminum or steel, the partition plate 90 may be disposed in contact with the heat exchanger 50. When the heat exchanger 50 is, for example, a fin tube type heat exchanger, a partition plate 90 may be inserted between the fins of the heat exchanger 50.

As described above, the air path between the heat exchanger 50 and the fan 20 is divided into a plurality of air paths (three in the first embodiment). A noise absorbing material can be provided in this air passage, that is, in the partition plate 90 and the casing 1 to reduce noise generated in the duct.

Further, these divided air paths are formed in a substantially square shape with one side being L1 and L2 in a plan view. That is, the width of the divided air path is L1 and L2. For this reason, for example, the amount of air generated by the fan 20 installed inside the substantially square shape formed by L1 and L2 is reliably transferred to the heat exchanger 50 in the region surrounded by L1 and L2 downstream of the fan 20. pass.

Thus, by dividing the air passage in the casing 1 into a plurality of air passages, the air blown from each fan 20 is blown into the indoor unit 100 even if the flow field created downstream by the fan 20 has a swirling component. Cannot move freely in the longitudinal direction (the direction perpendicular to the plane of FIG. 1). For this reason, the air blown out by the fan 20 can be passed through the heat exchanger 50 in the region surrounded by L1 and L2 downstream of the fan 20. As a result, variation in the air volume distribution in the longitudinal direction of the indoor unit 100 flowing into the entire heat exchanger 50 (in the direction orthogonal to the plane of FIG. 1) can be suppressed, and high heat exchange performance can be achieved. Further, by dividing the inside of the casing 1 with the partition plate 90, interference between the adjacent fans 20 and the swirl flow generated by the adjacent fans 20 can be prevented. For this reason, the loss of fluid energy due to the interference between the swirling flows can be suppressed, and the pressure loss of the indoor unit 100 can be reduced together with the improvement of the wind speed distribution. In addition, each partition plate 90 does not need to be formed with a single plate, and may be formed with a plurality of plates. For example, the partition plate 90 may be divided into two parts on the front side heat exchanger 51 side and the back side heat exchanger 55 side. Needless to say, it is preferable that there is no gap at the joint between the plates constituting the partition plate 90. By dividing the partition plate 90 into a plurality of parts, the assembling property of the partition plate 90 is improved.

(fan motor)
The fan 20 is rotationally driven by a fan motor 30. The fan motor 30 used may be an inner rotor type or an outer rotor type. In the case of the outer rotor type fan motor 30, a structure in which the rotor is integrated with the boss 21 of the fan 20 (the boss 21 is provided with a rotor) is also used. Further, by making the size of the fan motor 30 smaller than the size of the boss 21 of the fan 20, it is possible to prevent loss of the airflow generated by the fan 20. Further, by arranging a motor inside the boss 21, the axial dimension can be reduced. By making the fan motor 30 and the fan 20 easy to attach and detach, the maintainability is also improved.

The use of a relatively expensive DC brushless motor as the fan motor 30 can improve efficiency, extend the service life, and improve the controllability. However, even if other types of motors are used, air conditioning It goes without saying that the primary function of the machine is satisfied. Further, the circuit for driving the fan motor 30 may be integrated with the fan motor 30 or may be configured externally to take dust and fire prevention measures.

The fan motor 30 is attached to the casing 1 by a motor stay 16. Further, the fan motor 30 is a box type (fan 20, housing, fan motor 30, bell mouth 5, motor stay 16 and the like are integrated into a module) used for CPU cooling and the like, and is detachable from the casing 1. If the structure is possible, the maintainability is improved and the accuracy of the chip clearance of the fan 20 can be increased. In general, a narrow tip clearance is preferable because of high air blowing performance.

In addition, the drive circuit of the fan motor 30 may be configured inside the fan motor 30 or may be outside.

(Motor stay)
The motor stay 16 includes a fixing member 17 and a support member 18. The fixing member 17 is to which the fan motor 30 is attached. The support member 18 is a member for fixing the fixing member 17 to the casing 1. The support member 18 is, for example, a rod-like member, and extends from the outer peripheral portion of the fixing member 17, for example, radially. As shown in FIG. 1, the support member 18 according to the first embodiment extends approximately in the horizontal direction. In addition, the support member 18 may provide a stationary blade effect as a blade shape or a plate shape.

(Heat exchanger)
The heat exchanger 50 of the indoor unit 100 according to Embodiment 1 is arranged on the leeward side of the fan 20. As the heat exchanger 50, for example, a fin tube heat exchanger or the like may be used. As shown in FIG. 1, the heat exchanger 50 is divided by a symmetry line 50a in the right vertical section. The symmetry line 50a divides the installation range of the heat exchanger 50 in this cross section in the left-right direction at a substantially central portion. That is, the front side heat exchanger 51 is on the front side (left side in FIG. 1) with respect to the symmetry line 50a, and the rear side heat exchanger 55 is on the back side (right side in FIG. 1) with respect to the symmetry line 50a. Each is arranged. The front-side heat exchanger 51 and the rear-side heat exchanger 55 are arranged so that the distance between the front-side heat exchanger 51 and the rear-side heat exchanger 55 widens with respect to the air flow direction, that is, the right-side longitudinal section. The heat exchanger 50 is arranged in the casing 1 so that the cross-sectional shape of the heat exchanger 50 is substantially Λ-shaped. That is, the front side heat exchanger 51 and the back side heat exchanger 55 are arranged so as to be inclined with respect to the flow direction of the air supplied from the fan 20.

Furthermore, the heat exchanger 50 is characterized in that the air passage area of the rear heat exchanger 55 is larger than the air passage area of the front heat exchanger 51. That is, in the heat exchanger 50, the air volume of the back side heat exchanger 55 is larger than the air volume of the front side heat exchanger 51. In the first embodiment, the longitudinal length of the back side heat exchanger 55 is longer than the longitudinal length of the front side heat exchanger 51 in the right vertical section. Thereby, the air path area of the back surface side heat exchanger 55 is larger than the air path area of the front surface side heat exchanger 51. The other configurations (such as the length in the depth direction in FIG. 1) of the front side heat exchanger 51 and the back side heat exchanger 55 are the same. That is, the heat transfer area of the back side heat exchanger 55 is larger than the heat transfer area of the front side heat exchanger 51. Moreover, the rotating shaft 20a of the fan 20 is installed above the symmetry line 50a.

By configuring the heat exchanger 50 in this manner, the generation of a swirling flow of the air blown from the blower outlet 3 and the distribution of the wind speed are compared with a conventional air conditioner indoor unit in which a fan is provided at the blower outlet. Occurrence can be suppressed. In addition, by configuring the heat exchanger 50 in this manner, the air volume of the back side heat exchanger 55 is larger than the air volume of the front side heat exchanger 51. And when the air which passed each of the front side heat exchanger 51 and the back side heat exchanger 55 merges by this air volume difference, this merged air will bend to the front side (blower outlet 3 side). For this reason, it is no longer necessary to bend the airflow rapidly in the vicinity of the outlet 3, and the pressure loss in the vicinity of the outlet 3 can be reduced.

Moreover, in the indoor unit 100 according to the first embodiment, the flow direction of the air flowing out from the back side heat exchanger 55 is the flow from the back side to the front side. For this reason, the indoor unit 100 according to the first embodiment bends the flow of air after passing through the heat exchanger 50, as compared with the case where the heat exchanger 50 is arranged in a substantially v shape in the right vertical section. It becomes easy.

The indoor unit 100 has a plurality of fans 20 and thus tends to be heavy. When the indoor unit 100 becomes heavy, the strength of the wall surface for installing the indoor unit 100 is required, which is a restriction on installation. For this reason, it is preferable to reduce the weight of the heat exchanger 50. Moreover, since the indoor unit 100 arrange | positions the fan 20 in the upstream of the heat exchanger 50, the height dimension of the indoor unit 100 becomes large and tends to become restrictions on installation. For this reason, it is preferable to reduce the weight of the heat exchanger 50. Moreover, it is preferable to reduce the size of the heat exchanger 50.

Therefore, in the first embodiment, a fin tube heat exchanger is used as the heat exchanger 50 (the front side heat exchanger 51 and the back side heat exchanger 55), and the heat exchanger 50 is downsized. More specifically, the heat exchanger 50 according to the first embodiment includes a plurality of fins 56 stacked via a predetermined gap, and a plurality of heat transfer tubes 57 penetrating the fins 56. In the first embodiment, the fins 56 are stacked in the left-right direction of the casing 1 (the direction orthogonal to the plane of FIG. 1). That is, the heat transfer tube 57 passes through the fin 56 along the left-right direction of the casing 1 (the direction orthogonal to the plane of FIG. 1). In Embodiment 1, in order to improve the heat exchange efficiency of the heat exchanger 50, two rows of heat transfer tubes 57 are arranged in the ventilation direction of the heat exchanger 50 (the width direction of the fins 56). These heat transfer tubes 57 are arranged in a substantially zigzag shape in the right vertical section.

Further, the heat transfer tube 57 is formed by a thin tube (diameter of about 3 mm to 7 mm) and the refrigerant flowing through the heat transfer tube 57 (the refrigerant used in the indoor unit 100 and the air conditioner equipped with the indoor unit 100) is R32. Thus, the heat exchanger 50 is reduced in size. That is, the heat exchanger 50 exchanges heat between the refrigerant flowing in the heat transfer tube 57 and the room air via the fins 56. For this reason, when the heat transfer tube 57 is made thin, the pressure loss of the refrigerant becomes large at the same refrigerant circulation amount as compared with a heat exchanger having a large heat transfer tube diameter. However, R32 has a larger latent heat of vaporization at the same temperature than R410A, and can exhibit the same ability with a smaller amount of refrigerant circulation. For this reason, by using R32, the amount of refrigerant to be used can be reduced, and the pressure loss in the heat exchanger 50 can be reduced. Therefore, the heat exchanger 50 can be reduced in size by configuring the heat transfer tube 57 as a thin circular tube and using R32 as the refrigerant.

Also, in the heat exchanger 50 according to the first embodiment, the heat exchanger 50 is reduced in weight by forming the fins 56 and the heat transfer tubes 57 from aluminum or an aluminum alloy. In addition, when the weight of the heat exchanger 50 does not become an installation-like restriction | limiting, of course, you may comprise the heat exchanger tube 57 with copper.

(Finger guard & filter)
In the indoor unit 100 according to the first embodiment, the finger guard 15 and the filter 10 are provided at the suction port 2. The finger guard 15 is installed for the purpose of preventing the rotating fan 20 from being touched. For this reason, the shape of the finger guard 15 is arbitrary as long as the hand cannot be touched to the fan 20. For example, the shape of the finger guard 15 may be a lattice shape, or may be a circular shape formed of a large number of different rings. In addition, the finger guard 15 may be made of a material such as a resin or a metal material. However, when strength is required, the finger guard 15 is preferably made of a metal. In addition, the finger guard 15 is preferably as thin and strong as possible from the viewpoint of lowering ventilation resistance and maintaining strength. The filter 10 is provided to prevent dust from flowing into the indoor unit 100. The filter 10 is detachably provided on the casing 1. Moreover, although not shown in figure, the indoor unit 100 which concerns on this Embodiment 1 may be provided with the automatic cleaning mechanism which cleans the filter 10 automatically.

(Wind direction control vane)
Moreover, the indoor unit 100 which concerns on this Embodiment 1 is provided in the blower outlet 3 with the up-and-down vane 70 and the right-and-left vane (not shown) which are mechanisms which control the blowing direction of airflow.

(Drain pan)
FIG. 3 is a perspective view of the indoor unit according to Embodiment 1 of the present invention as viewed from the front right side. FIG. 4 is a perspective view of the indoor unit as viewed from the rear right side. FIG. 5 is a perspective view of the indoor unit as viewed from the front left side. FIG. 6 is a perspective view showing the drain pan according to Embodiment 1 of the present invention. In order to facilitate understanding of the shape of the drain pan, in FIGS. 3 and 4, the right side of the indoor unit 100 is shown in cross section, and in FIG. 5, the left side of the indoor unit 100 is shown in cross section.

A front side drain pan 110 is provided below a lower end portion of the front side heat exchanger 51 (a front side end portion of the front side heat exchanger 51). A back side drain pan 115 is provided below the lower end portion of the back side heat exchanger 55 (the back side end of the back side heat exchanger 55). In the first embodiment, the back side drain pan 115 and the back portion 1b of the casing 1 are integrally formed. The back side drain pan 115 is provided with connection ports 116 to which the drain hose 117 is connected at both the left end and the right end. In addition, it is not necessary to connect the drain hose 117 to both the connection ports 116, and the drain hose 117 may be connected to one of the connection ports 116. For example, when the drain hose 117 is to be pulled out to the right side of the indoor unit 100 during the installation work of the indoor unit 100, the drain hose 117 is connected to the connection port 116 provided at the right end of the back side drain pan 115, and the back side The connection port 116 provided at the left end of the drain pan 115 may be closed with a rubber cap or the like.

The front side drain pan 110 is disposed at a position higher than the back side drain pan 115. Further, between the front side drain pan 110 and the back side drain pan 115, a drainage channel 111 serving as a drain moving path is provided at both the left end and the right end. The drainage channel 111 has a front end connected to the front drain pan 110 and is provided so as to incline downward from the front drain pan 110 toward the rear drain pan 115. In addition, a tongue portion 111 a is formed at the end of the drainage channel 111 on the back side. The rear end of the drainage channel 111 is disposed so as to cover the upper surface of the back side drain pan 115.

During the cooling operation, when the indoor air is cooled by the heat exchanger 50, condensation occurs in the heat exchanger 50. The dew adhering to the front side heat exchanger 51 is dropped from the lower end portion of the front side heat exchanger 51 and collected by the front side drain pan 110. The dew adhering to the back side heat exchanger 55 drops from the lower end of the back side heat exchanger 55 and is collected by the back side drain pan 115.
In the first embodiment, the front-side drain pan 110 is provided at a position higher than the back-side drain pan 115, so that the drain collected by the front-side drain pan 110 is directed toward the back-side drain pan 115 toward the drainage channel 111. Flowing. Then, the drain is dropped from the tongue 111 a of the drainage channel 111 to the back side drain pan 115 and collected by the back side drain pan 115. The drain collected by the back side drain pan 115 passes through the drain hose 117 and is discharged to the outside of the casing 1 (indoor unit 100).

By providing the front-side drain pan 110 at a position higher than the back-side drain pan 115 as in the first embodiment, the drain collected by both drain pans is disposed on the back-side drain pan 115 (most rear side of the casing 1). Can be collected in the drain pan). For this reason, by providing the connection port 116 of the drain hose 117 in the back side drain pan 115, the drain collected by the front side drain pan 110 and the back side drain pan 115 can be discharged to the outside of the casing 1. Therefore, when performing maintenance (such as cleaning the heat exchanger 50) of the indoor unit 100 by opening the front surface of the casing 1, it is not necessary to attach or detach the drain pan to which the drain hose 117 is connected. Improves.

Further, since the drainage channels 111 are provided at both the left end and the right end, even if the indoor unit 100 is installed in an inclined state, the drain collected by the front side drain pan 110 can be surely received from the back side drain pan. 115. In addition, since the connection ports for connecting the drain hose 117 are provided at both the left end and the right end, the hose pull-out direction can be selected according to the installation conditions of the indoor unit 100, and the indoor unit 100 The workability when installing is improved. In addition, since the drainage channel 111 is disposed so as to cover the backside drain pan 115 (that is, a connection mechanism is not required between the drainage channel 111 and the backside drain pan 115), the front side drain pan 110 is disposed. It becomes easy to attach and detach, and the maintainability is further improved.

It should be noted that the drainage channel 111 may be disposed so that the rear side end of the drainage channel 111 is connected to the rear side drain pan 115 and the front side drain pan 110 covers the drainage channel 111. Even in such a configuration, it is possible to obtain the same effect as the configuration in which the drainage channel 111 is disposed so as to cover the back side drain pan 115. Further, the front-side drain pan 110 does not necessarily need to be higher than the rear-side drain pan 115. Even if the front-side drain pan 110 and the rear-side drain pan 115 have the same height, the drain collected by both drain pans is connected to the rear-side drain pan 115. The drainage hose can be discharged.

(nozzle)
Further, the indoor unit 100 according to Embodiment 1 has an opening length d1 on the entrance side of the nozzle 6 in the right vertical section (between the drain pans defined between the front-side drain pan 110 and the back-side drain pan 115 portion. The throttle length d1) is configured to be larger than the opening length d2 on the outlet side of the nozzle 6 (the length of the outlet 3). That is, the nozzle 6 of the indoor unit 100 satisfies d1> d2 (see FIG. 1).

The reason why the nozzle 6 satisfies d1> d2 is as follows. In addition, since d2 affects the reachability of the airflow, which is one of the basic functions of the indoor unit, in the following, d2 of the indoor unit 100 according to the first embodiment is approximately the same as the air outlet of the conventional indoor unit. It will be described as being length.

By making d1> d2 the shape of the nozzle 6 in the longitudinal section, the air passage becomes larger and the angle A of the heat exchanger 50 arranged on the upstream side (the front side heat on the downstream side of the heat exchanger 50). It is possible to increase the angle formed by the exchanger 51 and the back side heat exchanger 55. For this reason, the wind speed distribution generated in the heat exchanger 50 is relaxed, and the air path downstream of the heat exchanger 50 can be formed large, so that the pressure loss of the entire indoor unit 100 can be reduced. Furthermore, the deviation of the wind speed distribution that has occurred near the inlet of the nozzle 6 can be made uniform by the effect of contraction and guided to the outlet 3.

For example, in the case of d1 = d2, the deviation of the wind speed distribution generated near the inlet of the nozzle 6 (for example, the flow biased toward the back side) becomes the deviation of the wind speed distribution at the outlet 3 as it is. That is, in the case of d1 = d2, air is blown out from the outlet 3 in a state where the wind speed distribution is uneven. For example, in the case of d1 <d2, when the air that has passed through the front-side heat exchanger 51 and the rear-side heat exchanger 55 merges in the vicinity of the inlet of the nozzle 6, the contraction loss increases. For this reason, in the case of d1 <d2, if the diffusion effect of the outlet 3 is not obtained, a loss corresponding to the contraction loss occurs.

(ANC)
In addition, the indoor unit 100 according to Embodiment 1 is provided with an active silencing mechanism as shown in FIG.

More specifically, the silencing mechanism of the indoor unit 100 according to the first embodiment includes a noise detection microphone 161, a control speaker 181, a silencing effect detection microphone 191, and a signal processing device 201. The noise detection microphone 161 is a noise detection device that detects the operation sound (noise) of the indoor unit 100 including the blowing sound of the fan 20. The noise detection microphone 161 is disposed between the fan 20 and the heat exchanger 50. In the first embodiment, it is provided on the front surface in the casing 1. The control speaker 181 is a control sound output device that outputs a control sound for noise. The control speaker 181 is disposed below the noise detection microphone 161 and above the heat exchanger 50. In this Embodiment 1, it is provided in the front part in the casing 1 so that it may face the center of an air path. The silencing effect detection microphone 191 is a silencing effect detection device that detects the silencing effect by the control sound. The muffler effect detection microphone 191 is provided in the vicinity of the air outlet 3 in order to detect noise coming from the air outlet 3. Further, the muffler effect detection microphone 191 is attached at a position avoiding the wind flow so as not to hit the blown air coming out of the blowout port 3. The signal processing device 201 is a control sound generation device that causes the control speaker 181 to output a control sound based on the detection results of the noise detection microphone 161 and the silencing effect detection microphone 191. The signal processing device 201 is accommodated in the control device 281, for example.

FIG. 8 is a block diagram showing the signal processing apparatus according to Embodiment 1 of the present invention. Electric signals input from the noise detection microphone 161 and the muffler effect detection microphone 191 are amplified by the microphone amplifier 151 and converted from an analog signal to a digital signal by the A / D converter 152. The converted digital signal is input to the FIR filter 158 and the LMS algorithm 159. The FIR filter 158 generates a control signal that has been corrected so that the noise detected by the noise detection microphone 161 has the same amplitude and opposite phase as the noise when the noise reduction effect detection microphone 191 is installed. After being converted from a digital signal to an analog signal by the D / A converter 154, it is amplified by the amplifier 155 and emitted from the control speaker 181 as a control sound.

As shown in FIG. 7, when the air conditioner is in a cooling operation, the temperature of the region B between the heat exchanger 50 and the outlet 3 is lowered by the cold air, so that water vapor in the air appears as water droplets. Condensation occurs. For this reason, the indoor unit 100 is provided with a water receptacle or the like (not shown) for preventing water droplets from coming out of the air outlet 3 in the vicinity of the air outlet 3. In addition, since the area | region where the noise detection microphone 161 and the control speaker 181 which are upstream of the heat exchanger 50 are arrange | positioned is upstream of the area | region cooled with cold air | atmosphere, dew condensation does not arise.

Next, a method for suppressing the operation sound of the indoor unit 100 will be described. The operation sound (noise) including the blowing sound of the fan 20 in the indoor unit 100 is detected by the noise detection microphone 161 attached between the fan 20 and the heat exchanger 50, and the microphone amplifier 151 and the A / D converter 152 are detected. And is input to the FIR filter 158 and the LMS algorithm 159.

The tap coefficients of the FIR filter 158 are sequentially updated by the LMS algorithm 159. In the LMS algorithm 159, the tap coefficient is updated according to the equation 1 (h (n + 1) = h (n) + 2 · μ · e (n) · x (n)), and the optimum tap is set so that the error signal e approaches zero. The coefficient is updated.
Note that h is a filter tap coefficient, e is an error signal, x is a filter input signal, and μ is a step size parameter. The step size parameter μ controls a filter coefficient update amount for each sampling.

Thus, the digital signal that has passed through the FIR filter 158 whose tap coefficient has been updated by the LMS algorithm 159 is converted to an analog signal by the D / A converter 154, amplified by the amplifier 155, and the fan 20 and heat exchanger. 50 is emitted as a control sound from the control speaker 181 attached between the indoor unit 100 and the air passage in the indoor unit 100.

On the other hand, at the lower end of the indoor unit 100, the sound is transmitted from the fan 20 through the air path to the muffler effect detection microphone 191 attached in the direction of the outer wall of the air outlet 3 so that the wind emitted from the air outlet 3 does not hit. The sound after the control sound emitted from the control speaker 181 interferes with the noise coming out from the blow outlet 3 is detected. Since the sound detected by the muffling effect detection microphone 191 is input to the error signal of the LMS algorithm 159 described above, the tap coefficient of the FIR filter 158 is updated so that the sound after the interference approaches zero. become. As a result, noise in the vicinity of the air outlet 3 can be suppressed by the control sound that has passed through the FIR filter 158.

As described above, in the indoor unit 100 to which the active silencing method is applied, the noise detection microphone 161 and the control speaker 181 are arranged between the fan 20 and the heat exchanger 50, and the silencing effect detection microphone 191 is connected to the blower outlet 3. It is installed in the place where the wind current does not hit. For this reason, since it is not necessary to attach a member that requires active silencing to the region B where condensation occurs, water droplets are prevented from adhering to the control speaker 181, the noise detecting microphone 161, and the silencing effect detecting microphone 191, and the silencing performance is deteriorated. The failure of the speaker and microphone can be prevented.

Note that the mounting positions of the noise detection microphone 161, the control speaker 181 and the mute effect detection microphone 191 shown in the first embodiment are merely examples. For example, as shown in FIG. 9, the noise reduction effect detection microphone 191 may be disposed between the fan 20 and the heat exchanger 50 together with the noise detection microphone 161 and the control speaker 181. Further, although the microphone has been exemplified as a means for detecting the silencing effect after the noise is canceled by the noise or the control sound, it may be configured by an acceleration sensor or the like that detects the vibration of the casing. Alternatively, the sound may be regarded as air flow disturbance, and the noise reduction effect after the noise is canceled by noise or control sound may be detected as air flow disturbance. That is, a flow rate sensor, a hot wire probe, or the like that detects an air flow may be used as a means for detecting a silencing effect after noise is canceled by noise or control sound. It is also possible to detect the air flow by increasing the gain of the microphone.

In the first embodiment, the FIR filter 158 and the LMS algorithm 159 are used in the signal processing device 201. However, any adaptive signal processing circuit that brings the sound detected by the mute effect detection microphone 191 close to zero may be active. Alternatively, a filtered-X algorithm that is generally used in the dynamic silencing method may be used. Further, the signal processing device 201 may be configured to generate the control sound by a fixed tap coefficient instead of the adaptive signal processing. Further, the signal processing device 201 may be an analog signal processing circuit instead of digital signal processing.

Further, in the first embodiment, the case where the heat exchanger 50 that cools the air so that condensation occurs is described, but the present invention is applicable even when the heat exchanger 50 that does not cause condensation is disposed. Therefore, it is possible to prevent performance deterioration of the noise detection microphone 161, the control speaker 181, the silencing effect detection microphone 191, and the like without considering the presence or absence of dew condensation due to the heat exchanger 50.

Embodiment 2. FIG.
In the following, another embodiment of the active silencing method will be described. In the second embodiment, the same functions and configurations as those in the first embodiment will be described using the same reference numerals.

FIG. 10 is a longitudinal sectional view showing the indoor unit according to Embodiment 2 of the present invention. In FIG. 10, the right side of the figure is the front side of the indoor unit 100.
The indoor unit 100 described in the second embodiment is different from the indoor unit 100 according to the first embodiment in that the indoor unit 100 described in the first embodiment has a noise detection microphone 161 and a mute for active silencing. Although the control sound is generated by the signal processing device 201 using the two microphones of the effect detection microphone 191, in the indoor unit 100 of the second embodiment, these are one microphone and the noise / silence effect detection is performed. The microphone 211 has been replaced. Accordingly, since the signal processing method is different, the contents of the signal processing device 204 are different.

A control speaker 181 that outputs a control sound for noise is disposed on the lower wall portion of the fan 20 so as to face the center of the air path from the wall, and further on the lower side of the fan 20 through the air path. A noise / muffling effect detection microphone 211 for detecting a sound after propagating the control sound emitted from the control speaker 181 to the noise that propagates and exits from the air outlet 3 is disposed. The control speaker 181 and the noise / silence effect detection microphone 211 are attached between the fan 20 and the heat exchanger 50.

The output signal of the noise / muffling effect detection microphone 211 is input to a signal processing device 204 which is a control sound generating means for generating a signal (control sound) for controlling the control speaker 181.

FIG. 11 is a block diagram showing a signal processing apparatus according to Embodiment 2 of the present invention. The block diagram of the signal processing apparatus 204 is shown. The electrical signal converted from the sound signal by the noise / muffling effect detection microphone 211 is amplified by the microphone amplifier 151 and converted from an analog signal to a digital signal by the A / D converter 152. The converted digital signal is input to the LMS algorithm 159, and a difference signal from the signal obtained by convolving the FIR filter 160 with the output signal of the FIR filter 158 is input to the FIR filter 158 and the LMS algorithm 159. Next, the difference signal is subjected to a convolution operation by the tap coefficient calculated by the LMS algorithm 159 by the FIR filter 158, converted from a digital signal to an analog signal by the D / A converter 154, and amplified by the amplifier 155. The sound is emitted from the control speaker 181 as a control sound.

Next, a method for suppressing the operation sound of the indoor unit 100 will be described. The sound after the control sound output from the control speaker 181 interferes with the operation sound (noise) including the blowing sound of the fan 20 in the indoor unit 100 is attached between the fan 20 and the heat exchanger 50. It is detected by the noise / silence effect detection microphone 211 and converted into a digital signal via the microphone amplifier 151 and the A / D converter 152.

In order to perform a suppression method equivalent to the driving sound suppression method described in the first embodiment, noise to be silenced is input to the FIR filter 158, and an input signal is input to the LMS algorithm 159 as shown in Equation 1 as well. It is necessary to input the sound after the interference between the noise to be silenced and the control sound as an error signal. However, since the noise / muffling effect detection microphone 211 can only detect the sound after the control sound interferes with it, it is necessary to create noise to be muffled from the sound detected by the noise / muffling effect detection microphone 211.

FIG. 12 shows a sound waveform (a in FIG. 12), a control sound waveform (b in FIG. 12), and a noise waveform (c in FIG. 12) after interference between the noise and the control sound. It is. Since b + c = a from the principle of sound superposition, in order to obtain c from a, c can be obtained by taking the difference between a and b. That is, it is possible to create noise to be silenced from the difference between the interference sound detected by the noise / silence effect detection microphone 211 and the control sound.

FIG. 13 shows a path in which the control signal output from the FIR filter 158 is output as a control sound and output from the control speaker 181, and then detected by the noise / silence effect detection microphone 211 and input to the signal processing device 204. It is a figure. It passes through a D / A converter 154, an amplifier 155, a path from the control speaker 181 to the noise / silence effect detection microphone 211, a noise / silence effect detection microphone 211, a microphone amplifier 151, and an A / D converter 152.

Suppose that the transfer characteristic of this route is H, the FIR filter 160 in FIG. 11 estimates the transfer characteristic H. By convolving the FIR filter 160 with the output signal of the FIR filter 158, the control sound can be estimated as the signal b detected by the noise / silence effect detection microphone 211, and after the interference detected by the noise / silence effect detection microphone 211 The noise c to be silenced is generated by taking the difference from the sound a.

The noise c to be silenced generated in this way is supplied as an input signal to the LMS algorithm 159 and the FIR filter 158. The digital signal that has passed through the FIR filter 158 whose tap coefficient has been updated by the LMS algorithm 159 is converted into an analog signal by the D / A converter 154, amplified by the amplifier 155, and between the fan 20 and the heat exchanger 50. Control sound is emitted from the attached control speaker 181 to the air passage in the indoor unit 100.

On the other hand, the noise / muffling effect detection microphone 211 attached to the lower side of the control speaker 181 propagates through the air path from the fan 20 and is emitted from the control speaker 181 to the noise coming out from the air outlet 3. The sound after the control sound is made to interfere is detected. Since the sound detected by the noise / silencing effect detection microphone 211 is input to the error signal of the LMS algorithm 159 described above, the tap coefficient of the FIR filter 158 is updated so that the sound after the interference approaches zero. Will be. As a result, noise in the vicinity of the air outlet 3 can be suppressed by the control sound that has passed through the FIR filter 158.

As described above, in the indoor unit 100 to which the active silencing method is applied, the noise / silencing effect detection microphone 211 and the control speaker 181 are arranged between the fan 20 and the heat exchanger 50, so that a dew condensation occurs in the region B. Since it is not necessary to attach a member necessary for active silencing, it is possible to prevent water droplets from adhering to the control speaker 181 and the noise / silencing effect detection microphone 211, thereby preventing deterioration of the silencing performance and failure of the speaker and microphone.

In the second embodiment, the noise / muffling effect detection microphone 211 is arranged on the upstream side of the heat exchanger 50. However, as shown in FIG. It may be installed in a location where it does not hit (a position avoiding wind flow). Further, although the microphone has been exemplified as a means for detecting the silencing effect after the noise is canceled by the noise or the control sound, it may be configured by an acceleration sensor or the like that detects the vibration of the casing. Alternatively, the sound may be regarded as air flow disturbance, and the noise reduction effect after the noise is canceled by noise or control sound may be detected as air flow disturbance. That is, a flow rate sensor, a hot wire probe, or the like that detects an air flow may be used as a means for detecting a silencing effect after noise is canceled by noise or control sound. It is also possible to detect the air flow by increasing the gain of the microphone.

In the second embodiment, the FIR filter 158 and the LMS algorithm 159 are used as the adaptive signal processing circuit of the signal processing device 204. However, the adaptive signal processing circuit that brings the sound detected by the noise / silencing effect detection microphone 211 close to zero. Any filter-X algorithm that is generally used in the active silencing method may be used. Further, the signal processing device 204 may be configured to generate the control sound by a fixed tap coefficient instead of the adaptive signal processing. Further, the signal processing device 204 may be an analog signal processing circuit instead of digital signal processing.

Further, in the second embodiment, the case where the heat exchanger 50 that cools the air so that condensation occurs is described, but the present invention is applicable even when the heat exchanger 50 that does not cause condensation is disposed. Therefore, it is possible to prevent the performance deterioration of the noise / silencing effect detection microphone 211, the control speaker 181 and the like without considering the presence / absence of condensation due to the heat exchanger 50.

Embodiment 3 FIG.
For example, a silencer mechanism may be installed at the following position. In the third embodiment, the same functions and configurations as those in the first and second embodiments will be described using the same reference numerals.

In Embodiment 3 of the present invention, among the components of the silencer mechanism, a noise detection microphone 161 (corresponding to a noise detection device), a control speaker 181 (corresponding to a control sound output device), and a silencing effect detection microphone 191 (silence effect detection) (Corresponding to the apparatus) is provided downstream of the heat exchanger 50. For this reason, it is possible to reduce the influence of the turbulence of the airflow generated by the fan 20 on the muffler effect detection microphone 191 and to shorten the path until the control sound emitted from the control speaker 181 reaches the control point. Therefore, the indoor unit 100 according to the third embodiment can perform highly accurate noise control by the silencer mechanism. Furthermore, the indoor unit according to Embodiment 3 can also reduce the cost of the signal processing circuit.

This will be described in more detail below.
FIG. 15 is a longitudinal sectional view showing an indoor unit according to Embodiment 3 of the present invention. FIG. 15 shows the left side of the figure as the front side of the indoor unit 100 as in FIG. 1. Based on FIG. 15, the configuration of the indoor unit 100 will be described.
The configuration of the indoor unit 100 is different from that of FIG. 1 in the arrangement of a noise detection microphone 161 and a control speaker 181 that are silencers, and the other configuration is the same as that of the indoor unit 100 according to the first embodiment.

The indoor unit 100 includes a noise reduction mechanism including a noise detection microphone 161, a control speaker 181, a noise reduction effect detection microphone 191, and a signal processing device 201. The noise detection microphone 161 is attached to the downstream side of the heat exchanger 50. The muffler effect detection microphone 191 is attached in the vicinity of the air outlet 3 on the downstream side of the heat exchanger 50 (for example, the nozzle 6 portion forming the air outlet 3). In addition, the control speaker 181 is provided on the side surface of the casing 1 (more specifically, on the lower side of the heat exchanger 50 and near the muffler effect detection microphone 191). Further, the control speaker 181 and the muffler effect detection microphone 191 are arranged so as to face the center of the air path from the wall of the casing 1.

It should be noted that the installation position of the muffler effect detection microphone 191 is not limited to the nozzle 6 portion of the air outlet 3 and may be an opening portion of the air outlet 3. For example, the muffling effect detection microphone 191 may be attached to the lower part or the side part of the air outlet 3. In the third embodiment, the control speaker 181 is attached to the side surface of the casing 1, but the control speaker 181 may be attached to the front surface or the back surface of the casing 1. Further, the noise detection microphone 161 is not necessarily provided on the downstream side of the heat exchanger 50, and the control speaker 181 and the silencing effect detection microphone 191 may be provided on the downstream side of the heat exchanger 50.

Also, the output signals of the noise detection microphone 161 and the silencing effect detection microphone 191 are input to the signal processing device 201 for generating a signal (control sound) for controlling the control speaker 181. The configuration of the signal processing device 201 is exactly the same as that of the indoor unit 100 in the first embodiment.

Here, in order for the silencing mechanism according to the third embodiment to obtain a high silencing effect, it is necessary that the sound detected by the noise detection microphone 161 and the sound detected by the silencing effect detection microphone 191 have high coherence. However, a noise detection microphone 161 and a silencing effect detection microphone 191 are provided in a region where the airflow turbulence occurs due to the rotation of the impeller 25 of the fan 20 (for example, the air path between the fan 20 and the heat exchanger 50 in the indoor unit 100). When the is installed, a pressure fluctuation component due to airflow turbulence, which is a component other than the original noise, is detected, and the coherence between the two microphones decreases.

Therefore, in the indoor unit 100 according to the third embodiment, the noise detection microphone 161 and the silencing effect detection microphone 191 are installed on the downstream side of the heat exchanger 50. Since the indoor unit 100 has the fan 20 installed on the upstream side of the heat exchanger 50, the heat exchanger 50 can be installed between the noise detection microphone 161 and the muffler effect detection microphone 191 and the fan 20. When the noise detection microphone 161 and the silencing effect detection microphone 191 are installed in this way, the airflow turbulence generated in the fan 20 is suppressed by passing between the fins 56 of the heat exchanger 50. Therefore, the noise detection microphone 161 and the silencing effect detection are detected. The microphone 191 can reduce the influence of air current disturbance. Therefore, the coherence between the noise detection microphone 161 and the silencing effect detection microphone 191 increases, and a high silencing effect can be obtained.

FIG. 16 is a characteristic diagram showing the coherence characteristics between the two microphones depending on the installation positions of the noise detection microphone and the silencing effect detection microphone. Here, FIG. 16A shows both microphones when the noise detection microphone 161 and the muffling effect detection microphone 191 are provided upstream of the heat exchanger 50 (more specifically, between the fan 20 and the heat exchanger 50). It is the characteristic view which showed the coherence characteristic between. FIG. 16B is a characteristic diagram showing the coherence characteristics between the microphones when the noise detection microphone 161 and the silencing effect detection microphone 191 are provided on the downstream side of the heat exchanger 50. Comparing FIG. 16A and FIG. 16B, in the indoor unit 100 in which the fan 20 is on the upstream side of the heat exchanger 50, the noise detection microphone 161 and the silencing effect detection microphone 191 are connected to the heat exchanger 50. It can be seen that the coherence between the two microphones increases by providing it on the downstream side.

Also, the silence effect is affected by the distance from the installation position of the control speaker 181 to the installation position (control point) of the silencer detection microphone 191. That is, the length of the transmission path until the control sound emitted from the control speaker 181 reaches the control point (the installation position of the silence effect detection microphone 191) also affects the noise reduction effect. More specifically, the amplitude characteristic and the phase characteristic of the control sound emitted from the control speaker 181 change in the transmission path until it reaches the control point (installation position of the muffling effect detection microphone 191). If the amplitude characteristic and the phase characteristic change in the transmission path and the control sound does not have the same amplitude and opposite phase as the noise, the silencing effect is reduced.

In order to suppress a decrease in the silencing effect due to such a transmission path, in the general Filtered-X algorithm, the transmission path of the control sound is obtained in advance, and correction is performed in the process of generating the control sound. The problem of is solved. However, if the transmission path becomes longer, the number of filter taps of the required transmission path becomes longer, and the calculation processing increases. Furthermore, if the transmission path is long, such as when the sound speed changes due to changes in temperature or the like, the error between the determined transmission path and the actual transmission path becomes large, and the silencing effect is reduced.

For this reason, in order to suppress a decrease in the silencing effect due to the transmission path, it is preferable to install the control speaker 181 and the silencing effect detection microphone 191 close to each other. By installing the control speaker 181 and the muffling effect detection microphone 191 in this way, the transmission distance of the control sound can be shortened, and changes in the amplitude characteristic and the phase characteristic can be suppressed to a small level. In other words, by installing the control speaker 181 and the silencing effect detection microphone 191 close to each other, it becomes possible to superimpose highly accurate sound waves, so that a high silencing effect can be obtained. Therefore, in the indoor unit 100 according to the third embodiment, the control speaker 181 is provided on the downstream side of the heat exchanger 50 that is the installation position of the silencing effect detection microphone 191. For this reason, the transmission path | route until the control sound discharge | released from the control speaker 181 arrives at a control point (installation position of the silencing effect detection microphone 191) can be shortened, and a high silencing effect can be acquired.

Moreover, since the indoor unit 100 can install the fan 20 on the upstream side of the heat exchanger 50, the fan 20 serving as a noise source can be installed above the casing 1. For this reason, the noise transmission path until the noise from the fan 20 is emitted from the blower outlet 3 can be lengthened. For this reason, by installing the control speaker 181 on the downstream side of the heat exchanger 50, the distance between the noise detection microphone 161 and the control speaker 181 can be increased. That is, it is possible to take a long calculation time until the control sound is generated for the sound detected by the noise detection microphone 161, so that it is not necessary to increase the calculation speed. Therefore, since the indoor unit 100 according to the first embodiment can reduce the specifications of the A / D converter 152 and the digital signal processor that performs signal processing, the cost can be reduced.

In addition, when the noise detection microphone 161, the control speaker 181 and the muffler effect detection microphone 191 are provided on the downstream side of the heat exchanger 50, there is a possibility that condensation may occur due to direct contact with the cold air. May be used.

As described above, the indoor unit 100 according to the third embodiment includes at least the control speaker 181 and the silencing effect detection microphone 191 on the downstream side of the heat exchanger 50 among the components of the silencing mechanism. Therefore, the indoor unit 100 can reduce the influence of the turbulence of the airflow generated by the fan 20 on the silencing effect detection microphone 191, and the control sound emitted from the control speaker 181 is controlled by the control point (installation position of the silencing effect detection microphone 191). It is possible to shorten the route to reach. For this reason, the indoor unit 100 can perform highly accurate noise control by the silencer mechanism.

In the indoor unit 100 according to the third embodiment, the noise detection microphone 161 is also provided on the downstream side of the heat exchanger 50. For this reason, since the influence which the disturbance of the airflow which generate | occur | produced in the fan 20 has on the noise detection microphone 161 and the silencing effect detection microphone 191 can be reduced and the coherence between both microphones can be raised, a high silencing effect can be obtained. .

Moreover, in the indoor unit 100 according to the third embodiment, the fan 20 can be provided on the upstream side of the heat exchanger 50 and above the casing 1. For this reason, the transmission path of the noise from the fan 20 can be lengthened, and the distance between the noise detection microphone 161 and the control speaker 181 can be increased. For this reason, since it is not necessary to increase the speed of the arithmetic processing, the cost of the indoor unit 100 can be reduced.

Embodiment 4 FIG.
Even if the following silencing mechanism is used, the same silencing effect as in the third embodiment can be obtained. In Embodiment 4, items that are not particularly described are the same as those in Embodiments 1 to 3, and the same functions and configurations are described using the same reference numerals.

FIG. 17 is a longitudinal sectional view showing an indoor unit according to Embodiment 4 of the present invention.
The difference between the indoor unit 100 according to the fourth embodiment and the indoor unit 100 according to the third embodiment is that a microphone used for active silencing is different. More specifically, the indoor unit 100 according to Embodiment 3 uses two microphones (noise detection microphone 161 and mute effect detection microphone 191), and the signal processing device 201 generates control sound. On the other hand, in the indoor unit 100 of the fourth embodiment, the noise detection microphone 161 and the silencing effect detection microphone 191 are replaced with a noise / silencing effect detection microphone 211 which is one microphone. Further, since the signal processing method differs depending on the microphone used for dynamic silencing, the indoor unit 100 according to the fourth embodiment is different from the signal processing device 201 of the indoor unit 100 according to the third embodiment. A processing device 204 is used.

That is, the indoor unit 100 according to the fourth embodiment includes a silencer mechanism including a control speaker 181, a noise / silence effect detection microphone 211, and a signal processing device 204.

More specifically, the noise / silencing effect detection microphone 211 is attached in the vicinity of the air outlet 3 downstream of the heat exchanger 50 (for example, the nozzle 6 portion forming the air outlet 3). The noise / silencing effect detection microphone 211 detects sound after the control sound emitted from the control speaker 181 interferes with the operation sound (noise) of the indoor unit 100 including the blowing sound of the fan 20. In addition, a control speaker 181 that outputs a control sound for noise is provided on the side surface of the casing 1 (more specifically, on the lower side of the heat exchanger 50 and near the noise / silencing effect detection microphone 211). In addition, the control speaker 181 and the noise / silence effect detection microphone 211 are arranged below the heat exchanger 50 so as to face the center of the air path from the wall of the casing 1.

In addition, the installation position of the noise / silencing effect detection microphone 211 is not limited to the nozzle 6 portion of the air outlet 3, but may be an opening portion of the air outlet 3. For example, the noise / muffling effect detection microphone 211 may be attached to the lower part or the side part of the air outlet 3. In the fourth embodiment, the control speaker 181 is attached to the side surface of the casing 1, but the control speaker 181 may be attached to the front surface or the back surface of the casing 1.

Further, the output signal of the noise / muffling effect detection microphone 211 is input to the signal processing device 204 for generating a signal (control sound) for controlling the control speaker 181. Note that the configuration of the signal processing device 204 is exactly the same as that of the indoor unit 100 in the second embodiment.

Here, in order for the silencing mechanism according to the fourth embodiment to obtain a high silencing effect, it is necessary that the sound detected by the noise / silencing effect detection microphone 211 does not detect a pressure fluctuation component due to airflow turbulence. .

Therefore, in the indoor unit 100 according to the fourth embodiment, the noise / silencing effect detection microphone 211 is installed on the downstream side of the heat exchanger 50. In the indoor unit 100, since the fan 20 is installed on the upstream side of the heat exchanger 50, the heat exchanger 50 can be installed between the noise / silencing effect detection microphone 211 and the fan 20. When the noise / silence effect detecting microphone 211 is installed in this way, airflow turbulence generated in the fan 20 is suppressed by passing between the fins 56 of the heat exchanger 50. For this reason, the noise / silencing effect detection microphone 211 can obtain a high silencing effect by reducing the influence of airflow turbulence.

Also, the noise reduction effect is affected by the distance from the installation position of the control speaker 181 to the installation position (control point) of the noise / silence effect detection microphone 211. That is, the length of the transmission path until the control sound emitted from the control speaker 181 reaches the control point (the installation position of the noise / silence effect detection microphone 211) also affects the silencing effect. More specifically, the amplitude characteristic and the phase characteristic of the control sound emitted from the control speaker 181 change in the transmission path until it reaches the control point (the installation position of the noise / muffling effect detection microphone 211). If the amplitude characteristic and the phase characteristic change in the transmission path and the control sound does not have the same amplitude and opposite phase as the noise, the silencing effect is reduced.

Therefore, in order to suppress a decrease in the silencing effect due to the transmission path, it is preferable to install the control speaker 181 and the noise / silencing effect detecting microphone 211 close to each other. By installing the control speaker 181 and the noise / silencing effect detection microphone 211 in this way, the transmission distance of the control sound can be shortened, and changes in the amplitude characteristic and the phase characteristic can be suppressed to be small. In other words, by installing the control speaker 181 and the noise / silencing effect detection microphone 211 close to each other, it is possible to superimpose highly accurate sound waves, and thus a high silencing effect can be obtained.

Therefore, in the indoor unit 100 according to the fourth embodiment, the control speaker 181 is provided on the downstream side of the heat exchanger 50 where the noise / silencing effect detection microphone 211 is installed. For this reason, the transmission path | route until the control sound discharge | released from the control speaker 181 arrives at a control point (installation position of the noise and the silencing effect detection microphone 211) can be shortened, and a high silencing effect can be acquired.

In addition, when the control speaker 181 and the noise / silencing effect detection microphone 211 are provided on the downstream side of the heat exchanger 50, condensation may occur due to direct contact with the cold air. Also good.

As described above, in the indoor unit 100 according to the fourth embodiment, the heat exchanger 50 is provided on the downstream side of the fan 20. Furthermore, the indoor unit 100 includes at least a control speaker 181 and a noise / silencing effect detection microphone 211 on the downstream side of the heat exchanger 50 among the components of the silencing mechanism. For this reason, the indoor unit 100 can reduce the influence of the turbulence of the airflow generated by the fan 20 on the noise / silencing effect detection microphone 211, and the control sound generated from the control speaker 181 is controlled by the control point (noise / silence effect detection microphone 211). It is possible to shorten the route to reach the installation position. For this reason, the indoor unit 100 can perform highly accurate noise control by the silencer mechanism.

Embodiment 5 FIG.
(A noise detection microphone is installed on the boss.)
For example, a silencer mechanism may be installed at the following position. In the fifth embodiment, the same functions and configurations as those in the first to fourth embodiments are described using the same reference numerals.

FIG. 18 is a longitudinal sectional view showing the indoor unit according to Embodiment 5 of the present invention. FIG. 18 shows the right side of the drawing as the front side of the indoor unit 100.

In the indoor unit 100 according to the fifth embodiment, the heat exchanger 50 is fixed in the casing 1 by the heat exchanger fixing bracket 58. As indicated by the white arrow in FIG. 18, when the fan 20 is activated, indoor air is sucked into the air passage in the indoor unit 100 from the suction port 2, and the intake air is sucked into the heat exchanger 50 below the fan 20. After cooling or heating, the air is blown out from the air outlet 3 into the room.

FIG. 19 is a bottom view of the fan according to Embodiment 5 of the present invention (viewed from the lower side of FIG. 18). 20 is a cross-sectional view of the fan 20 shown in FIG.
In the fifth embodiment, a fan in which the fan 20, fan motor, bell mouth, motor stay 16 and the like are modularized is used. This is because if the structure is detachable from the casing 1, the maintainability is improved and the accuracy of the chip clearance of the fan 20 can be improved. The fan 20 includes an impeller 25 called a moving blade. A fan motor serving as a power source for the impeller 25 is provided in the fixing member 17 of the motor stay 16. The fixing member 17 is connected to a modularized fan housing or the like via a support member 18. A shaded portion in FIG. 19 indicates a portion corresponding to the inner periphery of the blade of the fan 20 (that is, an inscribed circle in contact with the inner periphery of the blade of the impeller 25). In addition, the support member 18 may provide a stationary blade effect as a blade shape or a plate shape.

The fan motor that is the power source of the impeller 25 and the boss 21 of the impeller 25 are connected by a rotating shaft 20a. Thereby, rotation of a fan motor is transmitted to the impeller 25 via the rotating shaft 20a, and the impeller 25 rotates. As the impeller 25 rotates, air flows (blows) in the direction indicated by the white arrow in FIG. In FIG. 20, a hatched portion indicates a portion that rotates when the fan 20 operates. In addition, a portion without hatching indicates a portion that does not rotate even when the fan 20 is operating (that is, a non-moving member). Further, a portion corresponding to the inner periphery of the blade of the fan 20 (that is, an inscribed circle in contact with the inner periphery of the blade of the impeller 25) is an outer periphery of the boss 21. In the fifth embodiment, the diameter of the fixing member 17 is substantially the same as the diameter of the boss 21.

18 again, the fixing member 17 corresponding to the inner periphery of the blade of the fan 20 has a noise detection microphone as a noise detection device for detecting the operation sound (noise) of the indoor unit 100 including the blowing sound of the fan 20. 161 is attached. That is, the noise detection microphone 161 is disposed in a cylindrical region (hereinafter referred to as a cylindrical region S) in which an inscribed circle that is in contact with the inner peripheral portion of the blade of the impeller 25 extends in the direction of the rotation axis of the impeller 25. . The fixing member 17 is configured to be independent of the rotating impeller 25 and not to rotate when the fan 20 is operated, as shown in FIG. For this reason, the noise detection microphone 161 does not rotate when the fan 20 operates. Further, a control speaker 181 is disposed below the noise detection microphone 161 as a control sound output device that outputs a control sound for noise from the wall of the casing 1 toward the center of the air path.

Furthermore, a muffler effect detection microphone 191 is attached to the lower wall of the indoor unit 100 as a muffler effect detection device for detecting a noise coming out of the outlet 3 and detecting a muffler effect, for example, at the top of the outlet 3. ing. The silencing effect detection microphone 191 is attached in the direction opposite to the flow path. Note that the installation position of the muffler effect detection microphone 191 is not limited to the upper part of the air outlet 3 but may be an opening of the air outlet 3. For example, the muffling effect detection microphone 191 may be attached to the lower part or the side part of the air outlet 3. Further, the silencing effect detection microphone 191 does not need to be provided in the direction opposite to the flow path accurately. The silencing effect detection microphone 191 only needs to be provided toward the outside of the indoor unit 100 (casing). That is, the silencing effect detection microphone 191 may be installed at a position where noise radiated indoors can be detected.

The output signals of the noise detection microphone 161 and the mute effect detection microphone 191 are input to a signal processing device 207 that is a control sound generation device for generating a signal (control sound) for controlling the control speaker 181. The silencing mechanism of the indoor unit 100 includes the noise detection microphone 161, the control speaker 181, the silencing effect detection microphone 191, and the signal processing device 207.

Next, the operation of the indoor unit 100 will be described. When the indoor unit 100 is operated, the impeller 25 of the fan 20 rotates, air in the room is sucked from the upper side of the fan 20, and air is generated by being sent to the lower side of the fan 20. Along with this, an operating sound (noise) is generated in the vicinity of the air outlet of the fan 20, and the sound propagates downstream.

In the vicinity of the blower outlet 3 of the fan 20, airflow turbulence occurs due to the rotation of the impeller 25. Moreover, since the air blown out from the fan 20 is blown outward from the blower outlet of the fan 20, the air hits the side wall of the casing 1 of the indoor unit 100, and further air turbulence is caused. For this reason, in the side wall of the casing 1, the pressure fluctuation due to the airflow turbulence becomes large. In contrast, in the region inside the inner periphery of the blades of the fan 20 (cylindrical region S), the turbulence of the airflow is small, and the pressure fluctuation due to the airflow is also small.

In order to support this, FIG. 22 shows the results of an experiment in which the airflow blown from the fan 20 was visualized. FIG. 22 is a photograph when the fan 20 is operated after the fan 20 is attached to the right end of the duct-shaped cylinder and white smoke is retained in the duct. Focusing on the vicinity of the blower outlet of the fan 20, it can be seen that in the area excluding the vicinity of the fixing member 17 and the cylindrical area S, the smoke staying in white is thin, and the white smoke is swept away by the airflow. On the other hand, in the vicinity of the fixing member 17 of the fan 20 and the cylindrical region S, white smoke remains and the influence of the airflow is small. In other words, it can be seen that the vicinity of the fixing member 17 of the fan 20 and the columnar region S are not easily affected by the airflow, and the pressure fluctuation due to the airflow turbulence is small.

The air sent by the fan 20 passes through the air path and is sent to the heat exchanger 50. For example, in the case of cooling operation, the heat exchanger 50 is supplied with refrigerant from a refrigerant pipe connected to an outdoor unit (not shown). The air sent to the heat exchanger 50 is cooled by the refrigerant flowing through the heat exchanger 50 to become cold air, and is directly discharged into the room from the outlet 3.

Next, a method for suppressing the operation sound of the indoor unit 100 will be described.
FIG. 21 is a block diagram showing a signal processing apparatus according to Embodiment 5 of the present invention.
The operation sound (noise) including the blowing sound of the fan 20 in the indoor unit 100 is detected by the noise detection microphone 161 attached to the fixing member 17 of the fan 20. Noise detected by the noise detection microphone 161 becomes a digital signal via the microphone amplifier 151 and the A / D converter 152 and is input to the FIR filter 158 and the LMS algorithm 159.

The tap coefficient of the FIR filter 158 is sequentially updated by the LMS algorithm 159. In the LMS algorithm 159, the error signal e approaches zero according to (h (n + 1) = h (n) + 2 · μ · e (n) · x (n)), similar to Equation 1 of the first embodiment. The optimal tap coefficient is updated.

In this way, the digital signal having the tap coefficient updated by the LMS algorithm 159 and passing through the FIR filter 158 is converted to an analog signal by the D / A converter 154, amplified by the amplifier 155, and sent as control sound from the control speaker 181. It is discharged to the air path in the indoor unit 100.

On the other hand, noise that propagates through the air path from the fan 20 and is emitted from the air outlet 3 into the room is transmitted to the muffler effect detection microphone 191 that is attached to the upper part of the air outlet 3 of the indoor unit 100 in the direction opposite to the flow path. In addition, the sound after the control sound emitted from the control speaker 181 interferes is detected. The signal detected by the silencing effect detection microphone 191 is converted into a digital signal and averaged by the weighting means 153.

FIG. 23 is a block diagram showing a circuit of weighting means according to the fifth embodiment of the present invention. The weighting unit 153 includes an integrator including a multiplier 121 that multiplies an input signal by a weighting coefficient, an adder 122, a delay element 123 for one sampling, and a multiplier 124.

In the fifth embodiment, the weighting coefficient of the multiplier 121 can be set from the outside depending on the installation environment or the like.
For example, in an environment where the disturbance is large and the operation is unstable, the weighting coefficient of the multiplier 121 may be set small. Conversely, in an environment where the disturbance is small, the weighting coefficient of the multiplier 121 may be set large. Thereby, the sensitivity with respect to an environmental change can be changed. Here, the averaging by the weighting unit 153 may not be performed until the LMS algorithm 159 is stabilized. This is because the noise cannot be sufficiently reduced while the LMS algorithm 159 is not stable, and the output value of the weighting means 153 may run away. Further, resetting may be performed when the output value of the weighting means 153 exceeds a certain value.

The signal averaged in this way is treated as the error signal e of the LMS algorithm 159 described above. Then, feedback control is performed so that the error signal e approaches zero, and the tap coefficient of the FIR filter 158 is appropriately updated. As a result, noise in the vicinity of the air outlet 3 can be suppressed by the control sound that has passed through the FIR filter 158.

Since the noise from the indoor unit 100 felt by humans is the noise after being released into the room from the air outlet 3, it is emitted into the room by directing the muffler effect detection microphone 191 toward the room on the opposite side of the flow path. Noise can be detected. That is, by attaching the muffling effect detection microphone 191 to the upper part of the air outlet 3 in the direction opposite to the flow path, it is possible to detect noise emitted into the room and sound with high coherence. Further, the muffler effect detection microphone 191 does not detect wind noise due to the airflow because the airflow is not directly applied. On the other hand, when the muffling effect detection microphone 191 is directed into the flow path, noise in the flow path is detected. For this reason, since the change of the characteristic of the sound in the place discharged | emitted from a blower outlet cannot be detected, the sound detected by the muffling effect detection microphone 191 differs from the noise in the room. Therefore, the coherence between the sound detected by the mute effect detection microphone 191 and the sound emitted into the room is reduced. Furthermore, since the airflow directly hits the muffler effect detection microphone 191, the muffler effect detection microphone 191 detects wind noise and further reduces coherence.

In addition, since the sound other than the noise generated from the fan 20 is included in the room, the stability of the feedback control is impaired by the sound other than the noise. For this reason, sounds other than noise are averaged by arranging the weighting means 153 in the previous stage of the feedback control. Thereby, sound components other than uncorrelated noise can be canceled, and feedback control can be stably operated. That is, the coherence between the noise detection microphone 161 and the silencing effect detection microphone 191 can be increased.

And in this Embodiment 5, since the noise detection microphone 161 is attached to the fixing member 17 of the fan 20, the airflow does not directly hit the noise detection microphone 161. For this reason, it can reduce that the noise detection microphone 161 detects the pressure fluctuation component by airflow disturbance. Therefore, the noise detection microphone 161 can detect noise that is the operation sound of the fan 20 and sound with high coherence. Further, since the muffler effect detection microphone 191 is attached to the upper part of the air outlet 3 in the direction opposite to the flow path, the muffler effect detection microphone 191 is not directly exposed to the airflow, and the muffler effect detection microphone 191 is not affected by the airflow. . Furthermore, since the silencing effect detection microphone 191 can detect only the noise emitted into the room, the silencing effect detection microphone 191 can detect noise actually heard by a person in the room and noise with high coherence. it can. Furthermore, since the sound detected by the muffling effect detection microphone 191 is averaged by the weighting means 153 and feedback control is performed, components other than noise from the indoor unit 100 included in the sound detected by the muffling effect detection microphone 191 Can be canceled out. For this reason, high coherence can be obtained for the detection sounds of the noise detection microphone 161 and the silencing effect detection microphone 191. Therefore, high coherence is obtained among the noise generated from the fan 20, the detection sound of the noise detection microphone 161, the detection sound of the mute effect detection microphone 191, and the indoor noise radiated from the indoor unit 100. And a high silencing effect can be obtained.

An experimental result of measuring the coherence between the noise detection microphone 161 and the silencing effect detection microphone 191 when the noise detection microphone 161 is actually attached to the inner side of the inner periphery (cylindrical region S) of the fan 20 will be described.

FIG. 24 shows the coherence characteristics between the detection sound of the noise detection microphone 161 and the detection sound of the mute effect detection microphone 191 when the noise detection microphone 161 is installed outside the cylindrical region S and the fan 20 is operated. Next, FIG. 25 shows coherence characteristics between the detection sound of the noise detection microphone 161 and the detection sound of the mute effect detection microphone 191 when the fan 20 is operated inside the cylindrical region S. Comparing FIG. 24 and FIG. 25, it can be seen that the coherence is clearly higher when the noise detection microphone 161 is installed inside the cylindrical region S.

Furthermore, by attaching the noise detection microphone 161 to the fixing member 17 of the fan 20, the noise detection microphone 161 can be easily attached without newly increasing the number of parts, and a precise attachment mechanism becomes unnecessary. Further, by installing the noise detection microphone 161 on the fixing member 17 of the fan 20, the distance between the fan 20 and the noise detection microphone 161 can be shortened, so that the height of the indoor unit 100 can be shortened.

In the fifth embodiment, the noise detection microphone 161 is installed on the fixed member 17, but inherent mechanical vibration accompanying the rotation of the fan 20 is transmitted to the fixed member 17, and the noise detection microphone 161 detects the vibration. There is a case. In this case, the coherence between the noise detection microphone 161 and the silencing effect detection microphone 191 may locally deteriorate. In such a case, the noise detection microphone 161 may be installed in a portion other than the fixed member 17 in the cylindrical region S. For example, as shown in FIG. 26, the noise detection microphone 161 may be installed on the heat exchanger 50 in the range within the cylindrical region S. Further, for example, as shown in FIG. 27, a noise detection microphone 161 may be installed under the heat exchanger fixing bracket 58 in a range within the cylindrical region S. By installing the noise detection microphone 161 in this way, the coherence between the noise detection microphone 161 and the silencing effect detection microphone 191 can be further increased and higher than when the noise detection microphone 161 is installed on the fixed member 17. A silencing effect can be obtained.

In addition, as shown in FIG. 28, the noise detection microphone 161 may be covered with a wall member 270. Since the air current can be blocked from the wall member, it is less affected by the air current, and a higher silencing effect can be obtained. In FIG. 28, the wall member 270 is formed in a substantially cylindrical shape, but the shape of the wall member 270 is arbitrary.
Even when the noise detection microphone 161 is attached to the heat exchanger 50 or the heat exchanger fixing bracket 58, the noise detection microphone 161 may be covered with the wall member 270. It is less affected by the airflow, and a higher silencing effect can be obtained.
Further, the muffler effect detection microphone 191 attached to the upper part of the air outlet 3 in the direction opposite to the flow path may be covered with a wall member. Since the airflow can be blocked, the noise reduction effect detecting microphone 191 is not affected by the airflow, and a higher noise reduction effect can be obtained.

In the fifth embodiment, the FIR filter 158 and the LMS algorithm 159 are used for the signal processing device 207. However, any adaptive signal processing circuit that brings the sound detected by the mute effect detection microphone 191 close to zero may be used. A filtered-X algorithm generally used in the mute method may be used. Further, the weighting means 153 does not have to be an integrator, and may be any means that can average. Further, the signal processing device 207 does not need to be configured to perform adaptive signal processing, and may be configured to generate a control sound using a fixed tap coefficient. Further, the signal processing device 207 does not have to be a digital signal processing circuit, but may be an analog signal processing circuit.

As described above, in the indoor unit 100 according to the fifth embodiment, the noise detection microphone 161 that is a noise detection device is provided in the cylindrical region S and on the stationary member of the fan 20. For this reason, since the influence of the airflow from the blower outlet of the fan 20 can be reduced and a sound with high noise and coherence can be detected, active silencing with high accuracy can be performed. Further, since the noise detection microphone 161 can be installed without changing the mechanism of the fan 20 and without increasing the number of parts of the indoor unit 100, the indoor unit 100 having a high degree of freedom in installation can be realized.
The immovable member of the fan 20 is not limited to the fixed member 17. If there is a stationary member in which at least a part of the components of the fan 20 is disposed in the cylindrical region S, the noise detection microphone 161 may be provided in a range that is in the cylindrical region S of the stationary member.

In the indoor unit 100 according to the fifth embodiment, the noise detection microphone 161 that is a noise detection device is provided in the cylindrical region S and on the downstream side of the fan 20. For this reason, since the influence of the airflow from the blower outlet of the fan 20 can be reduced and a sound with high noise and coherence can be detected, active silencing with high accuracy can be performed. Further, since the noise detection microphone 161 can be installed without changing the mechanism of the fan 20 and without increasing the number of parts of the indoor unit 100, the indoor unit 100 having a high degree of freedom in installation can be realized. Furthermore, since the mechanical vibration inherent to the rotation of the fan 20 is not detected by the noise detection microphone 161, active noise reduction can be performed with higher accuracy than when the noise detection microphone 161 is provided on the stationary member of the fan 20. .

In the case where the noise detection microphone 161 is provided on the downstream side of the fan 20, the components for providing the noise detection microphone 161 are not limited to the heat exchanger 50 or the heat exchanger fixing bracket 58. If there is a component that is at least partially in the cylindrical region S and disposed on the downstream side of the fan 20, the noise detection microphone 161 may be provided in a range that is in the cylindrical region S of the component.

Further, in the indoor unit 100 according to the fifth embodiment, a muffler effect detection microphone 191 that is a muffler effect detection device is provided at the opening of the air outlet 3 and is disposed toward the outside of the indoor unit 100. For this reason, the noise emitted into the room can be detected without being influenced by the airflow. Therefore, high coherence can be obtained for the indoor noise radiated from the indoor unit 100 and the sound detected by the muffler effect detection microphone 191. For this reason, it is possible to perform active silencing with high accuracy with respect to indoor noise radiated from the indoor unit 100.

In the indoor unit 100 according to the fifth embodiment, the signal processing device 207 that is the control sound generation device weights the detection result detected by the mute effect detection microphone 191 that is the mute effect detection device, and provides feedback. A circuit for performing control is provided. For this reason, it can cancel by averaging sounds other than the noise of the indoor unit 100 detected by the muffler effect detection microphone 191. Therefore, a high coherence sound can be detected between the noise detection microphone 161 and the silencing effect detection microphone 191, and more accurate active silencing can be performed.

Further, in the indoor unit 100 according to the fifth embodiment, the noise detection microphone 161 is installed in a range that is in the cylindrical region S in the fixing member 17 of the fan 20. For this reason, since the influence of the airflow from the blower outlet of the fan 20 can be reduced and a sound with high noise and coherence can be detected, active silencing with high accuracy can be performed. Moreover, since the noise detection microphone 161 can be installed without changing the mechanism of the fan 20 and without increasing the number of parts of the air conditioner, the indoor unit 100 with a high degree of installation freedom can be realized.

In the indoor unit 100 according to the fifth embodiment, the noise detection microphone 161 is provided in a range that is in the cylindrical region S of the heat exchanger 50. For this reason, since the influence of the airflow from the blower outlet of the fan 20 can be reduced and a sound with high noise and coherence can be detected, active silencing with high accuracy can be performed. Moreover, since the noise detection microphone 161 can be installed without changing the mechanism of the fan 20 and without increasing the number of parts of the air conditioner, the indoor unit 100 with a high degree of installation freedom can be realized. Furthermore, since the mechanical vibration inherent to the rotation of the fan 20 is not detected by the noise detection microphone 161, active noise reduction can be performed with higher accuracy than when the noise detection microphone 161 is provided on the stationary member of the fan 20. .

In the indoor unit 100 according to the fifth embodiment, the noise detection microphone 161 is provided in a range that is within the cylindrical region S of the heat exchanger fixing bracket 58. For this reason, since the influence of the airflow from the blower outlet of the fan 20 can be reduced and a sound with high noise and coherence can be detected, active silencing with high accuracy can be performed. Moreover, since the noise detection microphone 161 can be installed without changing the mechanism of the fan 20 and without increasing the number of parts of the air conditioner, the indoor unit 100 with a high degree of installation freedom can be realized. Furthermore, since the mechanical vibration inherent to the rotation of the fan 20 is not detected by the noise detection microphone 161, active noise reduction can be performed with higher accuracy than when the noise detection microphone 161 is provided on the stationary member of the fan 20. .

Further, in the indoor unit 100 according to the fifth embodiment, the noise detection microphone 161 is covered with the wall member 270. By blocking the air flow, the noise detection microphone 161 is less affected by the air flow, so that a higher silencing effect can be obtained.

Further, in the indoor unit 100 according to the fifth embodiment, the silencing effect detection microphone 191 is covered with a wall member. By blocking the air flow, the muffler effect detection microphone 191 is less affected by the air flow, so that a higher sound deadening effect can be obtained.

Embodiment 6 FIG.
In the sixth embodiment, the indoor unit 100 in which the noise / muffling effect detection microphone 211 is arranged as a noise / muffling effect detection device that integrates the noise detection microphone 161 and the muffling effect detection microphone 191 in the fifth embodiment will be described. . In the sixth embodiment, items not particularly described are the same as those in the fifth embodiment, and the same functions and configurations are described using the same reference numerals.

FIG. 29 is a longitudinal sectional view showing the indoor unit according to Embodiment 6 of the present invention. FIG. 29 shows the right side of the drawing as the front side of the indoor unit 100.

In the indoor unit 100 according to the sixth embodiment, the heat exchanger 50 is fixed in the casing 1 by the heat exchanger fixing bracket 58. As indicated by the white arrow in FIG. 29, when the fan 20 is activated, indoor air is sucked into the air passage in the indoor unit 100 from the suction port 2, and the intake air is sucked into the heat exchanger 50 below the fan 20. After cooling or heating, the air is blown out from the air outlet 3 into the room.

The difference between the indoor unit 100 according to the sixth embodiment and the indoor unit 100 according to the fifth embodiment is as follows. That is, the indoor unit 100 according to Embodiment 5 generates control sound by the signal processing device 207 using two microphones, a noise detection microphone 161 and a silencing effect detection microphone 191 for active silencing. It was. On the other hand, in the indoor unit 100 according to the sixth embodiment, these are replaced with a noise / silencing effect detection microphone 211 which is one microphone. Accordingly, since the signal processing method is different, the contents of the signal processing device 204 are different. On the side wall of the casing 1 of the indoor unit 100, a control speaker 181 that outputs a control sound for noise is disposed so as to face the center of the air path from the wall. Further, in the range within the cylindrical region S of the fixing member 17, the sound after the control sound emitted from the control speaker 181 interferes with the operation sound (noise) of the indoor unit 100 including the blowing sound of the fan 20. A noise / muffling effect detection microphone 211 for detecting the noise is disposed.

The fixing member 17 is configured so that the rotating impeller 25 is independent and does not rotate when the fan 20 operates. For this reason, the noise / silencing effect detection microphone 211 does not rotate when the fan 20 operates. The output signal of the noise / muffling effect detection microphone 211 is input to a signal processing device 204 which is a control sound generation device for generating a signal (control sound) for controlling the control speaker 181. The silencer mechanism of the indoor unit 100 includes the noise / silencer effect detection microphone 211, the control speaker 181, and the signal processing device 204. The signal processing device 204 has the same configuration as that of FIG. 11 described in the second embodiment.

Next, the operation of the indoor unit 100 will be described. When the indoor unit 100 is operated, the impeller 25 of the fan 20 rotates, air in the room is sucked from the upper side of the fan 20, and air is generated by being sent to the lower side of the fan 20. Along with this, an operating sound (noise) is generated in the vicinity of the air outlet of the fan 20, and the sound propagates downstream. In the vicinity of the blower outlet of the fan 20, air current turbulence occurs due to the rotation of the impeller 25, as in the fifth embodiment. Moreover, since the air blown out from the fan 20 is blown outward from the blower outlet of the fan 20, the air hits the side wall of the casing of the indoor unit 100, and further air turbulence is caused. For this reason, pressure fluctuation due to airflow turbulence increases on the side wall of the indoor unit 100. In contrast, in the region (cylindrical region S) inside the inner periphery of the blades of the fan 20, the turbulence of the airflow is small, and the pressure fluctuation due to the airflow is also small.

The method for suppressing the operation sound of the indoor unit 100 is exactly the same as the method described in the second embodiment, and the control sound is output so that the noise detected by the noise / silence effect detection microphone 211 approaches zero, and as a result The noise / silence effect detection microphone 211 operates to suppress noise.

As described above, in the sixth embodiment, in the indoor unit 100 to which the active silencing method is applied, the noise / silencing effect detection microphone 211 is attached in a range that is within the cylindrical region S of the fixed member 17, and thus the air flow Is not directly hit, and detection of pressure fluctuation components due to airflow turbulence can be reduced. For this reason, the noise which is the driving | running | working sound of the fan 20, and a sound with high coherence can be detected, and a high silencing effect can be acquired.

Furthermore, by attaching the noise / silence effect detection microphone 211 to the fixing member 17 of the fan 20, the noise / silence effect detection microphone 211 can be easily attached without increasing the number of parts, and a precise attachment mechanism is provided. It becomes unnecessary. Further, by installing the noise / silence effect detection microphone 211 on the fixing member 17 of the fan 20, the distance between the fan 20 and the noise / silence effect detection microphone 211 can be shortened, so the height of the indoor unit 100 is shortened. be able to.

In the sixth embodiment, the noise / silencing effect detection microphone 211 is installed on the fixed member 17, but the inherent mechanical vibration accompanying the rotation of the fan 20 is transmitted to the noise / silencing effect detection microphone 211, and the vibration is regarded as noise. The mute effect detection microphone 211 may detect. For this reason, the silencing effect may be reduced. In such a case, the noise / muffling effect detection microphone 211 may be installed in a portion other than the fixed member 17 in the cylindrical region S. For example, as shown in FIG. 30, a noise / silencing effect detection microphone 211 may be installed on the heat exchanger 50 in a range within the cylindrical region S. For example, as shown in FIG. 31, a noise / silencing effect detection microphone 211 may be installed under the heat exchanger fixing bracket 58 in a range within the cylindrical region S. By installing the noise / silence effect detecting microphone 211 in this way, a higher silencing effect can be obtained than when the noise / silence effect detecting microphone 211 is installed on the fixed member 17.

Further, as shown in FIG. 32, the noise / silencing effect detection microphone 211 may be covered with a wall member 270. Since the air flow can be blocked from the wall member 270, the influence of the air flow is further lessened, and a higher silencing effect can be obtained. In FIG. 32, the wall member 270 is formed in a substantially cylindrical shape, but the shape of the wall member 270 is arbitrary. Further, even when the noise / silencing effect detecting microphone 211 is attached to the heat exchanger 50 or the heat exchanger fixing bracket 58, the noise / silencing effect detecting microphone 211 may be covered with the wall member 270. It is less affected by the airflow, and a higher silencing effect can be obtained.

As described above, in the indoor unit 100 according to the sixth embodiment, the noise / silence effect detection microphone 211 that is a noise / silence effect detection device is provided in the cylindrical region S and on the stationary member of the fan 20. For this reason, since the influence of the airflow from the blower outlet of the fan 20 can be reduced and a sound with high noise and coherence can be detected, active silencing with high accuracy can be performed. In addition, since the noise / silencing effect detection microphone 211 can be installed without increasing the number of parts of the indoor unit 100, the indoor unit 100 having a high degree of freedom in installation can be realized.

In the sixth embodiment, the FIR filter 158 and the LMS algorithm 159 are used for the signal processing device 204. However, any adaptive signal processing circuit that brings the sound detected by the noise / silence effect detection microphone 211 close to zero may be used. A filtered-X algorithm generally used in the active silencing method may be used. Further, the signal processing device 204 need not be configured to perform adaptive signal processing, and may be configured to generate a control sound using a fixed tap coefficient. Further, the signal processing device 204 does not have to be a digital signal processing circuit, but may be an analog signal processing circuit.

Further, in the indoor unit 100 according to the sixth embodiment, the noise / silence effect detection microphone 211 that is a noise / silence effect detection device is provided in the cylindrical region S and on the downstream side of the fan 20. For this reason, since the influence of the airflow from the blower outlet of the fan 20 can be reduced and a sound with high noise and coherence can be detected, active silencing with high accuracy can be performed. In addition, since the noise / silencing effect detection microphone 211 can be installed without changing the mechanism of the fan 20 and without increasing the number of parts of the indoor unit 100, the indoor unit 100 having a high degree of freedom in installation can be realized. Furthermore, since the inherent mechanical vibration associated with the rotation of the fan 20 is not detected by the noise / silencing effect detection microphone 211, the noise / silence effect detection microphone 211 is more accurately active than when the noise / silence effect detection microphone 211 is provided on the stationary member of the fan 20. It can mute.

Further, in the indoor unit 100 according to the sixth embodiment, the noise / muffling effect detection microphone 211 is installed in a range within the cylindrical region S of the fixing member 17 of the fan 20. For this reason, since the influence of the airflow from the blower outlet of the fan 20 can be reduced and a sound with high noise and coherence can be detected, active silencing with high accuracy can be performed. In addition, since the noise / silencing effect detection microphone 211 can be installed without changing the mechanism of the fan 20 and without increasing the number of parts of the air conditioner, the indoor unit 100 having a high degree of freedom in installation can be realized.

Further, in the indoor unit 100 according to the sixth embodiment, the noise / silencing effect detection microphone 211 is provided in a range that is within the cylindrical region S of the heat exchanger 50. For this reason, since the influence of the airflow from the blower outlet of the fan 20 can be reduced and a sound with high noise and coherence can be detected, active silencing with high accuracy can be performed. In addition, since the noise / silencing effect detection microphone 211 can be installed without changing the mechanism of the fan 20 and without increasing the number of parts of the air conditioner, the indoor unit 100 having a high degree of freedom in installation can be realized. Furthermore, since the inherent mechanical vibration associated with the rotation of the fan 20 is not detected by the noise / silencing effect detection microphone 211, the noise / silence effect detection microphone 211 is more accurately active than when the noise / silence effect detection microphone 211 is provided on the stationary member of the fan 20. It can mute.

Further, in the indoor unit 100 according to the sixth embodiment, the noise / silencing effect detection microphone 211 is provided in a range that is within the cylindrical region S of the heat exchanger fixing bracket 58. For this reason, since the influence of the airflow from the blower outlet of the fan 20 can be reduced and a sound with high noise and coherence can be detected, active silencing with high accuracy can be performed. In addition, since the noise / silencing effect detection microphone 211 can be installed without changing the mechanism of the fan 20 and without increasing the number of parts of the air conditioner, the indoor unit 100 having a high degree of freedom in installation can be realized. Furthermore, since the inherent mechanical vibration associated with the rotation of the fan 20 is not detected by the noise / silencing effect detection microphone 211, the noise / silence effect detection microphone 211 is more accurately active than when the noise / silence effect detection microphone 211 is provided on the stationary member of the fan 20. It can mute.

Further, in the indoor unit 100 according to the sixth embodiment, the noise / muffling effect detection microphone 211 is covered with the wall member 270. By blocking the air flow, the noise / silence effect detection microphone 211 is less affected by the air flow, so that a higher silencing effect can be obtained.

Embodiment 7 FIG.
In the seventh embodiment, a description will be given of an indoor unit 100 in which a noise / silencing effect detection microphone 211 is installed on the upper part of the air outlet 3 so as to face the opposite side of the flow path. In Embodiment 7, items not particularly described are the same as those in Embodiment 5 or Embodiment 6, and the same functions and configurations are described using the same reference numerals.

FIG. 33 is a longitudinal sectional view showing the indoor unit according to Embodiment 7 of the present invention. FIG. 33 shows the right side of the figure as the front side of the indoor unit 100.

The indoor unit 100 according to the seventh embodiment is different from the indoor unit 100 according to the sixth embodiment in that a noise / silencing effect detection microphone 211 is arranged above the air outlet 3 so as to face the opposite side of the flow path. This is the point. Accordingly, the configuration of the signal processing device 208 is also different. Even when the noise / silence effect detection microphone 211 is attached to the upper part of the air outlet 3 in the direction opposite to the flow path, the noise / silence effect detection microphone 211 is newly added without increasing the number of parts as in the sixth embodiment. It can be easily installed, eliminating the need for a precise mounting mechanism. On the side wall of the casing 1 of the indoor unit 100, a control speaker 181 that outputs a control sound for noise is disposed so as to face the center of the air path from the wall. In addition, a noise / silencing effect detection microphone 211 that detects sound after the control sound emitted from the control speaker 181 interferes with the operation sound (noise) of the indoor unit 100 including the blowing sound of the fan 20 is provided at the outlet. 3 is arranged so as to face the opposite side of the flow path. The output signal of the noise / muffling effect detection microphone 211 is input to a signal processing device 208 which is a control sound generation device for generating a signal (control sound) for controlling the control speaker 181.

FIG. 34 shows a configuration diagram of the signal processing device 208. A difference from the signal processing device 204 shown in FIG. 11 is that weighting means 153 is arranged between the output of the A / D converter 152 and the input of the LMS algorithm 159. Other configurations are the same as those of the signal processing device 204 of the second embodiment.

Next, the operation of the indoor unit 100 will be described. When the indoor unit 100 is operated, the impeller 25 of the fan 20 is rotated, indoor air is sucked from the upper side of the fan 20, and air is generated by being sent to the lower side of the fan 20. Along with this, an operating sound (noise) is generated in the vicinity of the air outlet of the fan 20, and the sound propagates downstream. In the vicinity of the blower outlet of the fan 20, air current turbulence occurs due to the rotation of the impeller 25, as in the fifth and sixth embodiments. Moreover, since the air blown out from the fan 20 is blown outward from the blower outlet of the fan 20, the air hits the side wall of the casing of the indoor unit 100, and further air turbulence is caused. For this reason, pressure fluctuation due to airflow turbulence increases on the side wall of the indoor unit 100.

However, in the seventh embodiment, the noise / silencing effect detection microphone 211 is arranged on the upper part of the air outlet 3 in the direction opposite to the flow path. In the vicinity of the air outlet 3, the distance from the air outlet of the fan 20 having a large airflow turbulence is sufficiently larger than the vicinity of the fan 20. Further, near the air outlet 3, the air turbulence is rectified by the heat exchanger 50. For this reason, the turbulence of the air current in the vicinity of the noise / silencing effect detection microphone 211 is small. Furthermore, since the airflow is not directly applied to the area where the noise / silence effect detection microphone 211 is provided, the noise / silence effect detection microphone 211 is hardly affected by the airflow turbulence. Furthermore, since the noise from the indoor unit 100 that humans feel is the noise after being released from the outlet 3 into the room, the noise / silence effect detection microphone 211 is directed to the room on the opposite side of the flow path. The noise emitted into the room can be detected. That is, by attaching the noise / muffling effect detection microphone 211 to the upper part of the air outlet 3 in the direction opposite to the flow path, it is possible to detect noise emitted into the room and sound with high coherence.

Next, a method for suppressing the operation sound of the indoor unit 100 will be described. The control sound generation method of the seventh embodiment is the same as the method described in the second embodiment. The control sound generation method of the seventh embodiment is different from the method described in the second embodiment in that the weighting means 153 performs averaging on the signal input as an error signal to the LMS algorithm 159. . When the noise / silencing effect detection microphone 211 is disposed on the upper portion of the air outlet 3 in the direction opposite to the flow path, the noise detected by the noise / silence effect detection microphone 211 includes sound other than the noise generated from the fan 20. Maybe included. For this reason, the stability of feedback control is impaired by sounds other than these noises. Therefore, in the seventh embodiment, sounds other than noise are averaged by arranging the weighting means 153 in the previous stage of feedback control. Thereby, sound components other than uncorrelated noise can be canceled, and feedback control can be stably operated. That is, it is possible to increase the coherence between the noise after being discharged from the blowout port 3 into the room and the noise / silence effect detection microphone 211.

As in the fifth embodiment, the averaging by the weighting unit 153 may not be performed until the LMS algorithm 159 is stabilized. This is because the noise cannot be sufficiently reduced while the LMS algorithm 159 is not stable, and the output value of the weighting means 153 may run away. Further, resetting may be performed when the output value of the weighting means 153 exceeds a certain value. Further, the noise / muffling effect detection microphone 211 may be covered with a wall member 270 so as not to be further affected by the airflow. Since the air current can be blocked by the wall member, it is less affected by the air current, and a higher silencing effect can be obtained.

Further, the installation position of the noise / muffling effect detection microphone 211 is not limited to the upper part of the air outlet 3, but may be an opening of the air outlet 3. For example, the noise / muffling effect detection microphone 211 may be attached to the lower part or the side part of the air outlet 3. Further, the noise / muffling effect detection microphone 211 does not have to be provided in the direction opposite to the flow path accurately. The noise / muffling effect detection microphone 211 may be provided toward the outside of the indoor unit 100 (housing). That is, the noise / muffling effect detection microphone 211 may be installed at a position where noise radiated indoors can be detected.

In the seventh embodiment, the FIR filter 158 and the LMS algorithm 159 are used for the signal processing device 208. However, any adaptive signal processing circuit may be used as long as the sound detected by the noise / muffling effect detection microphone 211 approaches zero. A filtered-X algorithm generally used in the active silencing method may be used. Further, the weighting means 153 does not have to be an integrator, and may be any means that can average. Further, the signal processing device 208 does not need to be configured to perform adaptive signal processing, and may be configured to generate control sound using a fixed tap coefficient. Further, the signal processing device 208 does not need to be a digital signal processing circuit, and may be an analog signal processing circuit.

As described above, in the indoor unit 100 according to the seventh embodiment, the noise / silencing effect detection microphone 211 that is a noise / silencing effect detection device is provided at the opening of the air outlet 3 and is arranged toward the outside of the indoor unit 100. is doing. For this reason, the noise emitted into the room can be detected without being influenced by the airflow. Therefore, high coherence can be obtained for the indoor noise radiated from the indoor unit 100 and the detection sound of the noise / silence effect detection microphone 211. For this reason, it is possible to perform active silencing with high accuracy with respect to indoor noise radiated from the indoor unit 100.

In the indoor unit 100 according to the seventh embodiment, the signal processing device 208 as the control sound generation device weights the detection result detected by the noise / silence effect detection microphone 211 as the noise / silence effect detection device. And a circuit for performing feedback control. For this reason, the sound other than the noise of the indoor unit 100 detected by the noise / silencing effect detection microphone 211 can be canceled by averaging. Therefore, it is possible to perform active silencing with higher accuracy. In the indoor unit 100 according to the seventh embodiment, the noise / silencing effect detection microphone 211 is covered with the wall member 270. By blocking the air flow, the noise / silence effect detection microphone 211 is less affected by the air flow, so that a higher silencing effect can be obtained.

Embodiment 8 FIG.
(Fan individual control)
By individually controlling the rotation speed of each fan 20 provided in the indoor unit 100, the silencing effect of the active silencing mechanism is further improved. In the eighth embodiment, the same functions and configurations as those in the first to seventh embodiments will be described using the same reference numerals.

FIG. 35 is a front view showing an indoor unit according to Embodiment 8 of the present invention. FIG. 36 is a side view showing the indoor unit shown in FIG. FIG. 36 is a view of the indoor unit 100 shown in FIG. 35 as seen from the direction of the shaded arrows in FIG. 35, and shows the side wall of the casing 1 of the indoor unit 100 in a transparent manner. In FIG. 36, the remote controller 280, the control device 281 and the motor drivers 282A to 282C shown in FIG. 35 are not shown.

The indoor unit 100 shown in FIGS. 35 and 36 is formed with an inlet 2 in the upper part of the indoor unit 100 (more specifically, the casing 1 of the indoor unit 100). An opening 3 is formed at the lower end of the casing 1). That is, in the indoor unit 100, an air passage that communicates the suction port 2 and the air outlet 3 is formed. A plurality of fans 20 each having an impeller 25 are provided along the left-right direction (longitudinal direction) below the suction port 2 in the air passage. In the eighth embodiment, three fans (fans 20A to 20C) are provided. These fans 20A to 20C are provided such that the rotational axis center of the impeller 25 is in a substantially vertical direction. Each of these fans 20A to 20C is connected to the blower fan control means 171 of the control device 281 via motor drivers 282A to 282C. Details of the control device 281 will be described later.

Below the fans 20A to 20C, there is disposed a heat exchanger 50 that heats and cools or heats the air. As indicated by the white arrows in FIG. 35, when the fans 20A to 20C are activated, the indoor air is sucked into the air passages in the indoor unit 100 from the suction port 2, and the intake air is heated by the heat below the fans 20A to 20C. After cooling or heating with the exchanger 50, the air is blown out into the room from the air outlet 3.

In addition, the indoor unit 100 according to the eighth embodiment is provided with a silencing mechanism used for active silencing. The silencing mechanism of the indoor unit 100 according to the eighth embodiment includes

noise detection microphones

161 and 162,

control speakers

181 and 182, silencing

effect detection microphones

191 and 192, and

signal processing devices

201 and 202. That is, the silencing mechanism of the indoor unit 100 according to Embodiment 8 includes two noise detection microphones, two control speakers, and two silencing effect detection microphones. Hereinafter, the mute mechanism including the noise detection microphone 161, the control speaker 181, the mute effect detection microphone 191, and the signal processing device 201 is referred to as a mute mechanism A. Further, a silencing mechanism including the noise detection microphone 162, the control speaker 182, the silencing effect detection microphone 192, and the signal processing device 202 is referred to as a silencing mechanism B.

The

noise detection microphones

161 and 162 are noise detection devices that detect the operation sound (noise) of the indoor unit 100 including the blowing sound of the fans 20A to 20C (noise emitted from the fans 20A to 20C). The

noise detection microphones

161 and 162 are provided at positions downstream of the fans 20A to 20C (for example, between the fans 20A to 20C and the heat exchanger 50). The noise detection microphone 161 is provided on the left side surface of the indoor unit 100, and the noise detection microphone 162 is provided on the right side surface of the indoor unit 100.

Control speakers

181 and 182 are control sound output devices that output a control sound for noise. The

control speakers

181 and 182 are provided at positions downstream of the noise detection microphones 161 and 162 (for example, downstream of the heat exchanger 50). The control speaker 181 is provided on the left side surface of the indoor unit 100, and the control speaker 182 is provided on the right side surface of the indoor unit 100.

Control speakers

181 and 182 are arranged so as to face the center of the air path from the wall surface of casing 1 of indoor unit 100.

The silencing

effect detection microphones

191 and 192 are silencing effect detection devices that detect the silencing effect by the control sound. The mute

effect detection microphones

191 and 192 are provided at positions on the downstream side of the

control speakers

181 and 182. Further, the muffling effect detection microphone 191 is provided, for example, on an approximately extension line of the rotation axis of the fan 20A, and the mute effect detection microphone 192 is provided, for example, on an extension line of the rotation axis of the fan 20C. In the eighth embodiment, the mute

effect detection microphones

191 and 192 are provided on the nozzle 6 that forms the air outlet 3. That is, the silencing

effect detection microphones

191 and 192 detect the noise coming out from the air outlet 3 and detect the silencing effect.

The configuration of the

signal processing devices

201 and 202 is exactly the same as the configuration shown in FIG. 8 described in the first embodiment.

FIG. 37 is a block diagram showing a control apparatus according to Embodiment 8 of the present invention.
Various operations and means described below are performed by executing a program incorporated in the control device 281 included in the indoor unit 100. The control device 281 mainly includes an input unit 130 for inputting a signal from an external input device such as the remote controller 280, a CPU 131 for performing calculations according to an embedded program, and a memory 132 for storing data and programs. Further, the CPU 131 includes a blower fan control unit 171.

The blower fan control means 171 includes the same rotation speed determination means 133, a fan individual control rotation speed determination means 134, and a plurality of SWs 135 (the same number as the fan 20). The rotation speed determination means 133 determines the rotation speed when all the fans 20A to 20C are operated at the same rotation speed based on the operation information input from the remote controller 280. The operation information input from the remote controller 280 is, for example, operation mode information such as a cooling operation mode, a heating operation mode, and a dehumidifying operation mode, and air volume information such as strong, medium, and weak. The fan individual control rotation speed determination means 134 determines the rotation speed when individually controlling the rotation speeds of the fans 20A to 20C. The SW 135 switches the rotation control signals of the fans 20A to 20C sent to the motor drivers 282A to 282C, for example, based on a signal input from the remote controller 280. That is, the SW 135 switches between operating all the fans 20A to 20C at the same rotational speed or operating the fans 20A to 20C at individual rotational speeds.

Next, the operation of the indoor unit 100 will be described.
When the indoor unit 100 operates, the impellers of the fans 20A to 20C rotate, the indoor air is sucked from the upper side of the fans 20A to 20C, and the air is sent to the lower side of the fans 20A to 20C, thereby generating an air flow. . Along with this, a driving sound (noise) is generated in the vicinity of the air outlets of the fans 20A to 20C, and the sound propagates downstream. The air sent by the fans 20A to 20C passes through the air path and is sent to the heat exchanger 50. For example, in the case of cooling operation, low-temperature refrigerant is sent to the heat exchanger 50 from a pipe connected to an outdoor unit (not shown). The air sent to the heat exchanger 50 is cooled by the refrigerant flowing through the heat exchanger 50 to become cold air, and is directly discharged into the room from the outlet 3.

The operations of the silencing mechanism A and the silencing mechanism B are exactly the same as in the first embodiment, and a control sound is output so that the noise detected by the silencing

effect detection microphones

191 and 192 approaches zero. The

effect detection microphones

191 and 192 operate to suppress noise.
In the active silencing method, the control sound is output from the

control speakers

181 and 182 so that the phase is opposite to the noise at the installation locations (control points) of the silencing

effect detection microphones

191 and 192. For this reason, the silencing effect becomes high in the vicinity of the silencing

effect detection microphones

191, 192, but the phase of the control sound changes as the distance from the point increases. Therefore, at a location away from the muffler

effect detection microphones

191 and 192, the phase shift between the noise and the control sound is increased, and the muffler effect is reduced.

Next, a control method for individually controlling the rotation speeds of the fans 20A to 20C (hereinafter also referred to as fan individual control) will be described.
Operation information selected by the remote controller 280 is input to the control device 281. The operation information is, for example, operation mode information such as a cooling operation mode, a heating operation mode, and a dehumidifying operation mode. Further, the air volume information such as strong, medium, and weak is similarly input as operation information from the remote controller 280 to the control device 281. The operation information input to the control device 281 is input to the rotation speed determination unit 133 via the input unit 130. The same rotation speed determination means 133 to which the operation information is input determines the rotation speed when the fans 20A to 20C are all operated at the same rotation speed from the input operation information. When the individual fan control is not performed, all of the fans 20A to 20C are controlled at the same rotational speed (hereinafter also referred to as the same rotational speed control).

The information on the rotational speed (the rotational speed at the same rotational speed control) determined by the same rotational speed determination means 133 is input to the fan individual control rotational speed determination means 134. On the other hand, the fan individual control rotation speed determination means 134 reads out the blower fan information stored in advance in the memory 132 at the time of product shipment. The blower fan information is information of the fan 20 that emits noise with a high noise reduction effect when the control sound is interfered. That is, the blower fan information is information on the fan 20 that is highly related to the muffler

effect detection microphones

191 and 192. These identification numbers are assigned to each silencing effect detection microphone. In the eighth embodiment, the identification number of the fan 20 that is the closest (highly related) to the muffler

effect detection microphones

191 and 192 is used as the blower fan information. Specifically, the identification number of the fan 20A closest to the muffler effect detection microphone 191 and the identification number of the fan 20C closest to the muffler effect detection microphone 192 are shown.

The fan individual control rotation speed determination means 134 determines the rotation speed of each fan 20 when performing individual fan control based on the rotation speed information determined by the rotation speed determination means 133 and the blower fan information read from the memory 132. To do. Specifically, the fan individual control rotational speed determination means 134 increases the rotational speed of the

fans

20A and 20C that are closest to the silencing

effect detection microphones

191 and 192, and the distance from the silencing

effect detection microphones

191 and 192 increases. The rotational speed of the fan 20B is reduced. At this time, the rotation speeds of the fans 20A to 20C may be determined so that the air volume obtained in the individual fan control is the same as that in the same rotation speed control. Since the air volume and the rotation speed are in a proportional relationship, for example, in the case of the configuration shown in FIG. 35, if the rotation speed of the fan 20A and the fan 20C is increased by 10%, the rotation speed of the fan 20B is decreased by 20%. It becomes.

When an operation information signal for performing individual fan control (for example, a signal for the silent mode) is input from the remote controller 280, the rotation control signal for the same speed control is changed to the rotation control signal for the individual fan control by switching the SW 135. The rotation control signal is output from the control device 281 to the fans 20A to 20C. The rotation control signal output from the control device 281 is input to the motor drivers 282A to 282C, and the fans 20A to 20C are controlled to the number of rotations according to the rotation control signal.

As described above, when active silencing is performed, the silencing

effect detection microphones

191 and 192 that serve as control points for noise control and the surrounding silencing effects are enhanced, but from the

control speakers

181 and 182 at locations away from the control points. The phase shift between the radiated control sound and noise is increased, and the silencing effect is reduced. However, in the eighth embodiment, the indoor unit 100 is provided with a plurality of fans 20A to 20C, so that the

fans

20A and 20C (the silencing effect is close to the silencing

effect detection microphones

191 and 192 having a high silencing effect). The number of rotations of the fan 20B (fan that emits noise with a low noise reduction effect) far from the noise reduction

effect detection microphones

191 and 192 can be reduced.

As a result, in the indoor unit 100 according to the eighth embodiment, the region where the silencing effect is high further increases the silencing effect, and the region where the silencing effect is low reduces noise. Therefore, the indoor unit or fan using a single fan Compared with an indoor unit that does not perform individual control, noise radiated from the entire outlet 3 can be reduced. Further, by controlling the rotational speeds of the plurality of fans 20A to 20C so that the air volume becomes constant, it can be realized without deterioration of aerodynamic performance.

Furthermore, as shown in FIGS. 38 and 39, the silencing effect can be further improved by dividing the air path of the indoor unit 100 into a plurality of regions.

FIG. 38 is a front view showing another example of the indoor unit according to Embodiment 8 of the present invention. FIG. 39 is a left side view of the indoor unit shown in FIG. Note that FIG. 39 shows the side wall of the casing 1 of the indoor unit 100 in a transparent manner. The indoor unit 100 shown in FIGS. 38 and 39 divides the air path with the

partition plates

90 and 90a, thereby allowing the air blown out by the fan 20A, the region through which the air blown out by the fan 20B passes, and the air blown out by the fan 20C. It is divided into the areas where. And the noise detection microphone 161, the control speaker 181 and the silencing effect detection microphone 191 of the silencing mechanism A are arranged in a region through which the air blown out by the fan 20A passes. Further, the noise detection microphone 162, the control speaker 182 and the noise reduction effect detection microphone 192 of the silencer mechanism B are arranged in a region through which air blown out by the fan 20C passes.

By configuring the indoor unit 100 in this way, the noise radiated from the fans 20A to 20C can be separated into the respective regions, and the silencing mechanism A reduces only the noise radiated from the fan 20A. B reduces only the noise radiated from the fan 20C. Therefore, it is possible to prevent the

noise detection microphones

161 and 162 and the silencing

effect detection microphones

191 and 192 from detecting the noise radiated from the fan 20B, and thus the

noise detection microphones

161 and 162 and the silencing

effect detection microphones

191 and 192. The crosstalk noise component of becomes smaller.

Furthermore, noise can be captured in one dimension because the air path is closer to the duct structure. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced, so that the silencing effect is further enhanced. On the other hand, by reducing the rotational speed of the fan 20B that is not provided with the silencing mechanism, the noise in the area where the silencing mechanism is not provided is reduced. Therefore, by configuring the indoor unit 100 as shown in FIGS. 38 and 39, noise can be further reduced compared to the configuration of FIG. In FIGS. 38 and 39, a partition plate is inserted in the entire air path. However, a part of the air path is separated by a partition plate, for example, only on the upstream side of the heat exchanger 50 or only on the downstream side of the heat exchanger 50. You may make it delimit.

In the eighth embodiment, the

noise detection microphones

161 and 162 are installed on both side surfaces of the indoor unit 100. However, the

noise detection microphones

161 and 162 may be installed anywhere on the upstream side of the

control speakers

181 and 182. Further, in the eighth embodiment, the

control speakers

181 and 182 are arranged on both side surfaces of the indoor unit 100. However, if the

control speakers

181 and 182 are arranged on the downstream side of the

noise detection microphones

161 and 162 and the upstream side of the silencing

effect detection microphones

191 and 192, respectively. The installation positions of the

control speakers

181 and 182 may be anywhere. Furthermore, in the eighth embodiment, the muffling

effect detection microphones

191 and 192 are arranged almost on the extension line of the rotation axes of the

fans

20A and 20C. The installation position of 192 may be anywhere. Furthermore, in the eighth embodiment, two noise detection microphones, control speakers, muffler effect detection microphones, and signal processing devices are disposed, but the present invention is not limited to this.

In the eighth embodiment, the blower fan control unit 171 is configured by the CPU 131 in the control device 281. However, the blower fan control unit 171 is implemented by hardware such as LSI (Large Scale Integration) or FPGA (Field Programmable Gate Array). May be configured. Further, the configuration of the blower fan control means 171 is not limited to the configuration shown in FIG.

Further, in the eighth embodiment, the blower fan control means 171 increases the rotational speed of the

fans

20A and 20C that are close to the silencing

effect detection microphones

191 and 192, and decreases the rotational speed of the fan 20B that is far away. However, it may be configured to perform either one of them.

As described above, in the indoor unit 100 according to the eighth embodiment, the plurality of fans 20A to 20C are arranged, and the control device 281 (more specifically, the blower fan control means 171) controls the rotational speed of the fans 20A to 20C individually. ) Is provided. The blower fan control means 171 controls the

fan

20A, 20C blowing to the area near the muffler

effect detection microphones

191, 192, which is a high noise reduction area, to increase the rotational speed, and the area where the noise reduction effect is low. The rotational speed control is performed so as to reduce the rotational speed of the fan 20B that is blowing air to a region far from the muffler

effect detection microphones

191 and 192. For this reason, the region where the silencing effect is high has a higher silencing effect, and the region where the silencing effect is low has less noise. For this reason, a high noise reduction effect can be obtained as compared with an indoor unit that uses a single fan with the silencer mechanism having the same configuration or an indoor unit that does not perform individual fan control.

Further, the blower fan control means 171 controls the rotational speeds of the fans 20A to 20C so that the amount of air radiated from the air outlet 3 is the same when the same rotational speed control is performed as when the individual fan control is performed. Therefore, noise can be reduced without deteriorating the aerodynamic performance.

Furthermore, by dividing the air path of the indoor unit 100 into a plurality of regions by the

partition plates

90 and 90a, the noise radiated from the fans 20A to 20C can be separated, respectively, and the silencing mechanism A is radiated from the fan 20A. The noise reduction mechanism B reduces only the noise radiated from the fan 20C. For this reason, the crosstalk noise component by the noise radiated | emitted from the fan 20B becomes small.

Furthermore, by dividing the air passage of the indoor unit 100 into a plurality of regions by the

partition plates

90 and 90a, the air passage is brought closer to the duct structure, so that noise can be captured in one dimension. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced. Further, by reducing the rotation speed of the fan 20B not provided with the silencer mechanism, the noise in the area where the silencer mechanism is not provided is reduced, and a higher noise reduction effect can be obtained compared to the configuration of FIG. it can.

Embodiment 9 FIG.
In addition to the configuration of the eighth embodiment, individual fan control may be performed based on the silencing effect detected by the silencing effect detection microphone. In the ninth embodiment, differences from the above-described eighth embodiment will be mainly described, and the same parts as those in the eighth embodiment are denoted by the same reference numerals.

FIG. 40 is a front view of the indoor unit according to Embodiment 9 of the present invention.
The indoor unit 100 according to the ninth embodiment is different from the indoor unit 100 according to the eighth embodiment in that a silencing mechanism C (a noise detection microphone 163, a control speaker 183, a silencing effect detection microphone 193, and a signal processing device 203) is provided. This is the point. The configuration of the signal processing device 203 is exactly the same as that of the

signal processing devices

201 and 202. Note that the noise detection microphone 163, the control speaker 183, and the silencing effect detection microphone 193 are attached to the noise detection microphone 163, the control speaker 183, and the silencing effect detection microphone 193 in order from the downstream side of the fan 20B, as in the eighth embodiment. Should just be installed.

Further, in addition to the indoor unit 100 of the eighth embodiment, a signal line (signal line for sending signals S1, S2, S3) connected from the signal processing devices 201 to 203 to the blower fan control means 172 is provided. Different. For this reason, the structure of the blower fan control means 172 is also different from the structure of the blower fan control means 171 according to the eighth embodiment. Specifically, the signals S1, S2, and S3 sent from the signal processing devices 201 to 203 to the blower fan control means 172 are A / D converted from the signals input from the mute effect detection microphones 191 to 193 via the microphone amplifier 151. The signal is digitally converted by the device 152. That is, the signals S1, S2, and S3 are digital values of sound pressure levels detected by the mute effect detection microphones 191 to 193.

Next, the configuration of the blower fan control means 172 will be described.
FIG. 41 is a block diagram showing a control apparatus according to Embodiment 9 of the present invention. Various operations and means described below are performed by executing a program incorporated in the control device 281 included in the indoor unit 100. Similar to the configuration described in the eighth embodiment, the control device 281 mainly stores an input unit 130 for inputting a signal from an external input device such as the remote controller 280, a CPU 131 for performing calculations in accordance with an embedded program, and stores data and programs. A memory 132 is provided. Further, the CPU 131 includes a blower fan control unit 172.

The blower fan control means 172 includes the same rotation speed determination means 133, a plurality of averaging means 136 (the same number as the mute effect detection microphone), a fan individual control rotation speed determination means 134A, and a plurality of SWs 135 (the same number as the fan 20). Yes. The rotation speed determination means 133 determines the rotation speed when all the fans 20A to 20C are operated at the same rotation speed based on the operation information input from the remote controller 280. The operation information input from the remote controller 280 is, for example, operation mode information such as a cooling operation mode, a heating operation mode, and a dehumidifying operation mode, and air volume information such as strong, medium, and weak. The averaging means 136 receives the digital values S1, S2 and S3 of the sound pressure levels detected by the muffler effect detection microphones 191 to 193, and averages these S1, S2 and S3 signals for a certain period of time. To do.

The individual fan control rotation speed determination means 134A determines the fans 20A to 20C based on the rotation speed information inputted from the same rotation speed determination means 133 and the signals S1, S2 and S3 averaged by the averaging means 136. The number of rotations for individual fan control is determined. The SW 135 switches the rotation control signals of the fans 20A to 20C sent to the motor drivers 282A to 282C, for example, based on a signal input from the remote controller 280. That is, the SW 135 switches whether the fans 20A to 20C are all operated at the same rotational speed (whether the same rotational speed is controlled) or whether the fans 20A to 20C are respectively operated at individual rotational speeds (whether the fan is individually controlled). Is.

Next, the operation of the indoor unit 100 will be described.
As in the eighth embodiment, when the indoor unit 100 operates, the impellers of the fans 20A to 20C rotate, the indoor air is sucked from the upper side of the fans 20A to 20C, and the air is sent to the lower side of the fans 20A to 20C. Airflow is generated. Along with this, a driving sound (noise) is generated in the vicinity of the air outlets of the fans 20A to 20C, and the sound propagates downstream. The air sent by the fans 20A to 20C passes through the air path and is sent to the heat exchanger 50. For example, in the case of cooling operation, low-temperature refrigerant is sent to the heat exchanger 50 from a pipe connected to an outdoor unit (not shown). The air sent to the heat exchanger 50 is cooled by the refrigerant flowing through the heat exchanger 50 to become cold air, and is directly discharged into the room from the outlet 3.

Also, the operations of the silencing mechanisms A to C are exactly the same as in the eighth embodiment, and the control sound is output so that the noise detected by the silencing effect detection microphones 191 to 193 approaches zero, and as a result, the silencing effect detection The microphones 191 to 193 operate to suppress noise.

In the case of the indoor unit 100 according to the ninth embodiment, the noise reduction effect detection microphone 193 includes noise radiated from the

adjacent fans

20A and 20C (crosstalk noise component) in addition to the noise radiated from the fan 20B. ) Also comes in. On the other hand, the crosstalk noise component detected by the silencing

effect detection microphones

191 and 192 is smaller than the crosstalk noise component detected by the silencing effect detection microphone 193. This is because the silencing

effect detection microphones

191 and 192 have only one adjacent fan 20 (fan 20B). For this reason, the silencing effect of the silencing mechanisms A and B is higher than that of the silencing mechanism C.

Next, individual fan control of the fans 20A to 20C according to the ninth embodiment will be described.
Operation information selected by the remote controller 280 is input to the control device 281. As described above, the operation information is, for example, operation mode information such as a cooling operation mode, a heating operation mode, and a dehumidifying operation mode. Further, the air volume information such as strong, medium, and weak is similarly input as operation information from the remote controller 280 to the control device 281. The operation information input to the control device 281 is input to the rotation speed determination unit 133 via the input unit 130. The same rotation speed determining means 133 to which the operation information is input determines the rotation speed when the fans 20A to 20C are controlled at the same rotation speed from the input operation information.

On the other hand, S1 to S3 (digital values of sound pressure levels detected by the mute effect detection microphones 191 to 193) input from the signal processing devices 201 to 203 to the averaging means 136 are averaged by the averaging means 136 for a certain period. Averaged.

The sound pressure level value obtained by averaging each of these S1 to S3 and the information on the rotational speed determined by the same rotational speed determining means 133 (the rotational speed at the same rotational speed control) are the fan individual control rotational speed determining means 134A. Is input. Based on these pieces of information, the individual fan control rotation speed determination means 134A determines the rotation speed of each fan 20 when performing individual fan control. Specifically, the muffler effect detection with a small averaged sound pressure level value is detected by increasing the number of rotations of the fan that is close to (highly related to) the microphone with a small sound pressure level value and having a large averaged sound pressure level value. The rotation speed of the fan is determined so as to reduce the rotation speed of the fan that is close to the microphone (highly related). At this time, the rotation speeds of the fans 20A to 20C may be determined so that the air volume obtained in the individual fan control is the same as that in the same rotation speed control.

For example, in the indoor unit 100 according to the ninth embodiment, the average value of the noise level detected by the silencing effect detection microphone 191 is 45 dB, the average value of the noise level detected by the silencing effect detection microphone 192 is 45 dB, and the silencing effect detection When the average value of the noise level detected by the microphone 193 is 50 dB, the fan individual control rotation speed determination means 134A increases the rotation speed of the

fans

20A and 20C and decreases the rotation speed of the fan 20B. Determine the number of revolutions. Since the air volume and the rotation speed are in a proportional relationship, for example, in the case of the configuration shown in FIG. 40, if the rotation speed of the fan 20A and the fan 20C is increased by 10%, the rotation speed of the fan 20B is decreased by 20%. It becomes.

Note that the above-described method for determining the rotational speed of the fans 20A to 20C is merely an example. For example, the average value of the noise level detected by the silencing effect detection microphone 191 is 45 dB, the average value of the noise level detected by the silencing effect detection microphone 192 is 47 dB, and the average value of the noise level detected by the silencing effect detection microphone 193 is 50 dB. In such a case, the rotational speed of each fan 20 may be determined such that the rotational speed of the fan 20A is increased, the rotational speed of the fan 20B is decreased, and the rotational speed of the fan 20C is left as it is. That is, the rotation speed of the fan 20A close to the noise reduction effect detection microphone 191 with the lowest detected noise level is increased, and the rotation speed of the fan 20B close to the noise reduction effect detection microphone 193 with the highest detected noise level is decreased. However, the rotational speed of each fan 20 may be determined so that the rotational speed of the fan 20C that is neither of them is left as it is.

As described above, in the indoor unit 100 according to the ninth embodiment, the silencing effect detection microphone is compared with the region near the silencing effect detection microphone 193 due to the magnitude of the crosstalk noise component from the adjacent fan. The area near 191 and 192 has a higher noise reduction effect. In other words, in the case of the indoor unit 100 according to the ninth embodiment, the noise level detected in the area near the silencing

effect detection microphones

191 and 192 is smaller than the area near the silencing effect detection microphone 193. On the other hand, the silencing effect is low in the area near the silencing effect detection microphone 193. Therefore, in the indoor unit 100 according to the ninth embodiment provided with a plurality of fans 20A to 20C, the detected noise level average value among the average values of the noise level values detected by the silencing effect detection microphones 191 to 193. The rotational speeds of the

fans

20A and 20C close to the sound deadening

effect detection microphones

191 and 192 are increased, and the rotational speed of the fan 20B close to the sound deadening effect detection microphone 193 having a large average noise level detected is decreased. Yes.

As a result, the indoor unit 100 according to the ninth embodiment has a higher silencing effect in a region where the silencing effect is high, and noise is small in a region where the silencing effect is low. Therefore, the indoor unit or fan using a single fan Compared with an indoor unit that does not perform individual control, noise radiated from the entire outlet 3 can be reduced.

Furthermore, as shown in FIGS. 42 and 43, the silencing effect can be further improved by dividing the air path of the indoor unit 100 into a plurality of regions.

FIG. 42 is a front view showing another example of the indoor unit according to Embodiment 9 of the present invention. FIG. 43 is a left side view of the indoor unit shown in FIG. FIG. 43 shows the side wall of the casing 1 of the indoor unit 100 in a transparent manner. The indoor unit 100 shown in FIGS. 42 and 43 divides the air path with the

partition plates

90 and 90a, thereby allowing the air blown by the fan 20A to pass through, the air passing through the fan 20B, and the air blown out by the fan 20C. It is divided into areas that pass. And the noise detection microphone 161, the control speaker 181 and the silencing effect detection microphone 191 of the silencing mechanism A are arranged in a region through which the air blown out by the fan 20A passes. Further, the noise detection microphone 162, the control speaker 182 and the noise reduction effect detection microphone 192 of the silencer mechanism B are arranged in a region through which air blown out by the fan 20C passes. Further, the noise detection microphone 163, the control speaker 183, and the noise reduction effect detection microphone 193 of the silencer mechanism C are arranged in a region through which the air blown out by the fan 20B passes.

By configuring the indoor unit 100 in this way, the noise radiated from the fans 20A to 20C can be separated into the respective regions, and the silencing mechanism A reduces only the noise radiated from the fan 20A. B reduces only the noise radiated from the fan 20C, and the silencing mechanism C reduces only the noise radiated from the fan 20B. For this reason, the crosstalk noise components (noise radiated from the fans provided in the adjacent flow paths) detected by the noise detection microphones 161 to 163 and the silencing effect detection microphones 191 to 193 are reduced.

Furthermore, noise can be captured in one dimension because the air path is closer to the duct structure. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced, so that the silencing effect is further enhanced. Therefore, by configuring the indoor unit 100 as shown in FIGS. 42 and 43, noise can be further reduced as compared with the configuration of FIG. 42 and 43, a partition plate is inserted in the entire air path. However, a part of the air path is separated by a partition plate, for example, only on the upstream side of the heat exchanger 50 or only on the downstream side of the heat exchanger 50. You may make it delimit. Similarly to the eighth embodiment, even when there is a fan 20 that is not provided with a silencing mechanism as shown in FIG. 44 (the fan 20B is not provided with a silencing mechanism C in FIG. 44), By reducing the number of revolutions, the noise in the area where the silencing mechanism is not provided is reduced, and a similar silencing effect can be obtained.

The installation positions of the noise detection microphones 161 to 163 may be anywhere upstream of the control speakers 181 to 183. Further, the installation positions of the control speakers 181 to 183 may be anywhere as long as they are downstream of the noise detection microphones 161 to 163 and upstream of the silencing effect detection microphones 191 to 193. Further, in the ninth embodiment, the silencing effect detection microphones 191 to 193 are arranged on substantially the extension line of the rotation shafts of the fans 20A to 20C, but the silencing effect detection microphones 191 to 191 are provided on the downstream side of the control speakers 181 to 183. The installation position of 193 may be anywhere. Furthermore, in the ninth embodiment, two to three noise detection microphones, control speakers, muffler effect detection microphones, and signal processing devices are arranged, but the present invention is not limited to this.

In the ninth embodiment, the blower fan control unit 172 is configured by the CPU 131 in the control device 281, but may be configured by hardware such as LSI (Large Scale Integration) or FPGA (Field Programmable Gate Array). . Further, the configuration of the blower fan control means 172 is not limited to the configuration shown in FIG.

In the ninth embodiment, the blower fan control means 172 increases the number of rotations of the

fans

20A and 20C that are close to the noise reduction

effect detection microphones

191 and 192 having a low noise level and has a high noise level. Although the configuration is such that the rotational speed of the fan 20B close to the detection microphone 193 is low, it may be configured to perform either one of them.

As described above, in the indoor unit 100 according to the ninth embodiment, the plurality of fans 20A to 20C are arranged, and the control device 281 (more specifically, the blower fan control means 172) that individually controls the rotational speed of the fans 20A to 20C. ) Is provided. The blower fan control means 172 performs control so as to increase the rotational speed of the fan whose distance is close to the muffler effect detection microphone having a small detected noise level among the average values of the noise levels detected by the muffler effect detection microphones 191 to 193. Then, the rotational speed control is performed so as to reduce the rotational speed of the fan that is close to the muffler effect detection microphone having a large detected noise level. For this reason, the region where the silencing effect is high (that is, the noise level is small) is further enhanced, and the region where the silencing effect is low (that is, the noise level is large) is low. For this reason, noise can be further reduced as compared with an indoor unit that uses a single fan with a silencing mechanism having the same configuration, or an indoor unit that does not perform individual fan control.

Further, the blower fan control means 172 controls the rotational speeds of the fans 20A to 20C so that the amount of air radiated from the air outlet 3 is the same when the rotational speed control is the same as when performing individual fan control. Therefore, noise can be reduced without deteriorating the aerodynamic performance.

partition plates

90 and 90a, the noise radiated from the fans 20A to 20C can be separated, respectively, and the silencing mechanism A is radiated from the fan 20A. The noise reduction mechanism B reduces only the noise emitted from the fan 20C, and the noise reduction mechanism C reduces only the noise emitted from the fan 20B. For this reason, in each area | region, the crosstalk noise component by the noise radiated | emitted to the adjacent area | region becomes small.

partition plates

90 and 90a, the air passage is brought closer to the duct structure, so that noise can be captured in one dimension. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced, so that a higher noise reduction effect can be obtained compared to the configuration of FIG. . Further, even when there is a fan 20 that is not provided with a silencing mechanism as shown in FIG. 44, by reducing the rotation speed of the fan 20, the noise in the area where the silencing mechanism is not provided is reduced, and the same silencing effect is obtained. Can be obtained.

Embodiment 10 FIG.
When performing individual fan control according to the silencing effect detected by the silencing effect detection microphone, for example, the individual fan control may be performed as follows. In the tenth embodiment, differences from the above-described eighth or ninth embodiment will be mainly described, and the same reference numerals are given to the same portions as those in the eighth or ninth embodiment. is doing.

FIG. 45 is a front view showing an indoor unit according to Embodiment 10 of the present invention.
The indoor unit 100 according to the tenth embodiment is different from the indoor unit 100 according to the ninth embodiment in that signal lines (signals T1, T2, T3) connected from the signal processing devices 201 to 203 to the blower fan control means 173 are different. Is further provided with a signal line). For this reason, the structure of the ventilation fan control means 173 is also different from the structure of the ventilation fan control means 172 according to the ninth embodiment. Specifically, the signals S1, S2, and S3 sent from the signal processing devices 201 to 203 to the blower fan control means 173 are the signals input from the mute effect detection microphones 191 to 193, as in the ninth embodiment. This signal is digitally converted by the A / D converter 152 through the amplifier 151. That is, the signals S1, S2, and S3 are digital values of sound pressure levels detected by the mute effect detection microphones 191 to 193. The newly added signals T1, T2, and T3 are signals obtained by digitally converting the signals input from the noise detection microphones 161 to 163 through the microphone amplifier 151 by the A / D converter 152. That is, the signals T1, T2, and T3 are digital values of sound pressure levels detected by the noise detection microphones 161 to 163.

Next, the configuration of the blower fan control means 173 will be described.
FIG. 46 is a block diagram showing a control apparatus according to Embodiment 10 of the present invention. Various operations and means described below are performed by executing a program incorporated in the control device 281 included in the indoor unit 100. Similar to the configuration described in the ninth embodiment, the control device 281 mainly stores an input unit 130 for inputting a signal from an external input device such as the remote controller 280, a CPU 131 for performing an operation according to a built-in program, and data and programs. A memory 132 is provided. Further, the CPU 131 includes a blower fan control unit 173.

The blower fan control means 173 includes the same rotation speed determination means 133, a plurality of coherence calculation means 137 (the same number as the silencing effect detection microphone), a fan individual control rotation speed determination means 134B, and a plurality of SW 135 (the same number as the fan 20). Yes. The rotation speed determination means 133 determines the rotation speed when all the fans 20A to 20C are operated at the same rotation speed based on the operation information input from the remote controller 280. The operation information input from the remote controller 280 is, for example, operation mode information such as a cooling operation mode, a heating operation mode, and a dehumidifying operation mode, and air volume information such as strong, medium, and weak. The coherence calculating means 137 includes digital values S1, S2, S3 of sound pressure levels detected by the mute effect detection microphones 191 to 193 and digital values T1, T2, T3 of sound pressure levels detected by the noise detection microphones 161 to 163. Is input. The coherence calculating means 137 calculates the coherence of S1 and T1, S2 and T2, and S3 and T3.

Based on the coherence value calculated by the coherence calculating unit 137 and the rotation number information input from the same rotation number determining unit 133, the fan individual control rotation number determining unit 134B controls each of the fans 20A to 20C when performing individual fan control. The number of revolutions is determined. The SW 135 switches the rotation control signals of the fans 20A to 20C sent to the motor drivers 282A to 282C, for example, based on a signal input from the remote controller 280. That is, the SW 135 switches whether the fans 20A to 20C are all operated at the same rotational speed (whether the same rotational speed is controlled) or whether the fans 20A to 20C are respectively operated at individual rotational speeds (whether the fan is individually controlled). Is.

Next, the operation of the indoor unit 100 will be described.
As in the ninth embodiment, when the indoor unit 100 operates, the impellers of the fans 20A to 20C rotate, the indoor air is sucked from the upper side of the fans 20A to 20C, and the air is sent to the lower side of the fans 20A to 20C. Airflow is generated. Along with this, a driving sound (noise) is generated in the vicinity of the air outlets of the fans 20A to 20C, and the sound propagates downstream. The air sent by the fans 20A to 20C passes through the air path and is sent to the heat exchanger 50. For example, in the case of cooling operation, low-temperature refrigerant is sent to the heat exchanger 50 from a pipe connected to an outdoor unit (not shown). The air sent to the heat exchanger 50 is cooled by the refrigerant flowing through the heat exchanger 50 to become cold air, and is directly discharged into the room from the outlet 3.

Also, the operations of the silencing mechanisms A to C are exactly the same as in the ninth embodiment, and the control sound is output so that the noise detected by the silencing effect detection microphones 191 to 193 approaches zero, and as a result, the silencing effect detection The microphones 191 to 193 operate to suppress noise.

Generally, the silencing effect due to active silencing is greatly influenced by the coherence values of the noise detection microphones 161 to 163 and the silencing effect detection microphones 191 to 193. That is, the noise reduction effect cannot be expected unless the coherence between the noise detection microphones 161 to 163 and the noise reduction effect detection microphones 191 to 193 is high. Conversely, the silencing effect can be predicted from the coherence values of the noise detection microphones 161 to 163 and the silencing effect detection microphones 191 to 193.

Therefore, the indoor unit 100 according to the tenth embodiment (more specifically, the blower fan control means 173 of the control device 281) is based on the coherence values of the noise detection microphones 161 to 163 and the silencing effect detection microphones 191 to 193. The rotation speeds of the fans 20A to 20C are controlled so as to increase the rotation speed of the fan in the area where the silencing effect is estimated to be high and to decrease the rotation speed of the fan in the area where the silencing effect is estimated to be low.

Next, individual fan control of the fans 20A to 20C according to the tenth embodiment will be described.
Operation information selected by the remote controller 280 is input to the control device 281. As described above, the operation information is, for example, operation mode information such as a cooling operation mode, a heating operation mode, and a dehumidifying operation mode. Further, the air volume information such as strong, medium, and weak is similarly input as operation information from the remote controller 280 to the control device 281. The operation information input to the control device 281 is input to the rotation speed determination unit 133 via the input unit 130. The same rotation speed determining means 133 to which the operation information is input determines the rotation speed when the fans 20A to 20C are controlled at the same rotation speed from the input operation information.

On the other hand, the digital values S1 to S3 of the sound pressure levels detected by the mute effect detection microphones 191 to 193 and the digital values of the sound pressure levels detected by the noise detection microphones 161 to 163, which are input from the signal processing devices 201 to 203. From T1 to T3, a coherence value between the respective microphones is obtained by the coherence calculating means 137.

Information on the coherence value calculated by the coherence calculating means 137 and the rotational speed determined by the rotational speed determining means 133 (the rotational speed at the same rotational speed control) is input to the fan individual control rotational speed determining means 134B. . Based on these pieces of information, the individual fan control rotation speed determination means 134B determines the rotation speed of each fan when performing individual fan control. Specifically, the fan speed is close (highly related) to the muffler effect detection microphone with a high coherence value, and the fan is close (highly related) to the noise reduction effect detection microphone with a low coherence value. The number of rotations of the fan is determined so as to reduce the number of rotations. At this time, the rotation speeds of the fans 20A to 20C may be determined so that the air volume obtained in the individual fan control is the same as that in the same rotation speed control.

For example, in the indoor unit 100 according to Embodiment 10, the coherence value between the noise detection microphone 161 and the silencing effect detection microphone 191 is 0.8, and the coherence between the noise detection microphone 162 and the silencing effect detection microphone 192 is When the value is 0.8 and the coherence value between the noise detection microphone 163 and the muffler effect detection microphone 193 is 0.5, the fan individual control rotation speed determination unit 134B increases the rotation speed of the

fans

20A and 20C. Then, the rotational speed of each fan is determined so as to reduce the rotational speed of the fan 20B. Since the air volume and the rotational speed are in a proportional relationship, for example, in the case of the configuration shown in FIG. 45, if the rotational speed of the fan 20A and the fan 20C is increased by 10%, the rotational speed of the fan 20B is decreased by 20%. It becomes.

Note that the above-described method for determining the rotational speed of the fans 20A to 20C is merely an example. For example, the coherence value between the noise detection microphone 161 and the silencing effect detection microphone 191 is 0.8, the coherence value between the noise detection microphone 162 and the silencing effect detection microphone 192 is 0.7, and the noise detection microphone 163 When the coherence value with the muffler effect detection microphone 193 is 0.5, the rotational speed of the fan 20A is increased, the rotational speed of the fan 20B is decreased, and the rotational speed of the fan 20C is left as it is. You may determine the rotation speed of a fan. That is, the rotation speed of the fan 20A whose distance is close to the silencing effect detection microphone 191 having the highest coherence value is increased, and the rotation speed of the fan 20B whose distance is closest to the silencing effect detection microphone 193 having the lowest coherence value is decreased. However, the rotational speed of each fan may be determined so that the rotational speed of the fan 20C remains unchanged.

As described above, when active silencing is used, the expected silencing effect varies depending on the coherence values of the noise detection microphones 161 to 163 and the silencing effect detection microphones 191 to 193. That is, it can be inferred that the muffling effect detection microphone with a high coherence value has a high silencing effect, and the silencing effect detection microphone with a low coherence value has a low silencing effect. Therefore, in the indoor unit 100 according to the tenth embodiment provided with a plurality of fans 20A to 20C, the number of rotations of a fan close to the silencing effect detection microphone with a high coherence value is increased, and the silencing effect detection with a low coherence value is detected. The fan speed close to the microphone is reduced.

As a result, in the indoor unit 100 according to the tenth embodiment, the region where the silencing effect is estimated to be higher has a higher silencing effect, and the region where the silencing effect is estimated to be lower has less noise. For this reason, the noise radiated | emitted from the blower outlet 3 whole can be reduced compared with the indoor unit which uses a single fan, and the indoor unit which does not perform fan separate control. Furthermore, the indoor unit 100 according to the tenth embodiment has aerodynamic performance degradation by individually controlling the rotational speeds of the plurality of fans 20A to 20C so that the airflow is constant when the rotational speed control is performed. Can be suppressed.

Furthermore, as shown in FIGS. 42 and 43 of the ninth embodiment, the silencing effect can be further improved by dividing the air path of the indoor unit 100 into a plurality of regions. In other words, the noise radiated from the fans 20A to 20C can be separated into the respective areas, the silencing mechanism A reduces only the noise radiated from the fan 20A, and the silencing mechanism B only the noise radiated from the fan 20C. The silencing mechanism C can reduce only the noise radiated from the fan 20B. Therefore, crosstalk noise components (noise radiated from fans provided in adjacent flow paths) detected by the noise detection microphones 161 to 163 and the silencing effect detection microphones 191 to 193 are reduced.

Furthermore, noise can be captured in one dimension because the air path is closer to the duct structure. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced, so that the silencing effect is further enhanced. Therefore, by dividing the air path of the indoor unit 100 into a plurality of regions, noise can be further reduced compared to the configuration of FIG. Similarly to FIG. 44 of the ninth embodiment, when there is a fan that is not provided with the silencing mechanism, the noise in the area where the silencing mechanism is not provided is reduced by lowering the rotational speed of the fan 20, A similar silencing effect can be obtained.

Note that the installation positions of the noise detection microphones 161 to 163 according to the tenth embodiment may be anywhere upstream of the control speakers 181 to 183. Further, the installation positions of the control speakers 181 to 183 may be anywhere as long as they are downstream of the noise detection microphones 161 to 163 and upstream of the silencing effect detection microphones 191 to 193. Further, in the tenth embodiment, the muffler effect detection microphones 191 to 193 are arranged on substantially the extension line of the rotation shafts of the fans 20A to 20C, but the muffler effect detection microphones 191 to 193 are provided downstream of the control speakers 181 to 183. The installation position of can be anywhere. Further, in the tenth embodiment, three noise detection microphones, control speakers, muffler effect detection microphones, and signal processing devices are arranged, but the present invention is not limited to this.

In the tenth embodiment, the blower fan control unit 173 is configured by the CPU 131 in the control device 281, but may be configured by hardware such as LSI (Large Scale Integration) or FPGA (Field Programmable Gate Array). . Further, the configuration of the blower fan control means 173 is not limited to the configuration shown in FIG.

Further, in the tenth embodiment, the blower fan control means 173 increases the number of rotations of the

fans

20A and 20C that are close to the silencing

effect detection microphones

191 and 192 having a large coherence value and the silencing effect that has a small coherence value. Although the configuration is such that the rotational speed of the fan 20B close to the detection microphone 193 is low, it may be configured to perform either one of them.

As described above, in the indoor unit 100 according to the tenth embodiment, a plurality of fans 20A to 20C are arranged, and the control device 281 (more specifically, the blower fan control means 173) that individually controls the rotational speed of the fans 20A to 20C. ) Is provided. The blower fan control means 173 calculates coherence values between the noise detection microphones 161 to 163 and the silencing effect detection microphones 191 to 193, and the rotation speed of the fan that is close to the silencing effect detection microphone having a high coherence value with the noise detection microphone. And the rotational speed control is performed so as to reduce the rotational speed of the fan that is close to the muffler effect detection microphone having a low coherence value with the noise detection microphone. As a result, the region where a high silencing effect can be expected has a higher silencing effect, and the region where no silencing effect can be expected has less noise. For this reason, noise can be further reduced as compared with an indoor unit that uses a single fan with a silencing mechanism having the same configuration, or an indoor unit that does not perform individual fan control.

The blower fan control means 173 controls the rotational speeds of the fans 20A to 20C so that the amount of air radiated from the air outlet 3 is the same when the rotational speed control is the same as when the individual fan control is performed. Therefore, noise can be reduced without deteriorating the aerodynamic performance.

partition plates

90 and 90a, the air passage is brought closer to the duct structure, so that noise can be captured in one dimension. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced, so that a higher noise reduction effect can be obtained compared to the configuration of FIG. . Further, even when there is a fan 20 that is not provided with a silencing mechanism, by reducing the rotation speed of the fan 20, noise in a region where the silencing mechanism is not provided is reduced, and a similar silencing effect can be obtained. .

Furthermore, in the indoor unit 100 according to the tenth embodiment, the number of revolutions is controlled based on the coherence values of the noise detection microphone and the silencing effect detection microphone. Since the theoretical silencing effect can be estimated from the coherence value, the rotation speed of the fan can be controlled more optimally and finely based on the coherence value of each silencing effect detection microphone. For this reason, the indoor unit 100 which concerns on this Embodiment 10 can acquire a higher noise reduction effect compared with the structure of Embodiment 8 and Embodiment 9. FIG.

Embodiment 11 FIG.
The silencing mechanism for carrying out the present invention is not limited to the silencing mechanism shown in the eighth to tenth embodiments. For example, an air conditioner having effects similar to those of the eighth to tenth embodiments can be obtained even if a silencer mechanism different from the above is used. In the eleventh embodiment, an example in which a different silencing mechanism is used for the air conditioner according to the eighth embodiment will be described. In the eleventh embodiment, differences from the above-described eighth to tenth embodiments will be mainly described, and the same parts as those in the eighth to tenth embodiments are denoted by the same reference numerals. is doing.

FIG. 47 is a front view showing the indoor unit according to Embodiment 11 of the present invention.
The difference between the indoor unit 100 according to the eleventh embodiment and the indoor unit 100 according to the eighth embodiment is the configuration of the silencer mechanism. Specifically, in the silencing mechanism A of the indoor unit 100 according to Embodiment 8, two microphones (noise detection microphone 161 and silencing effect detection microphone 191) are used for active silencing. On the other hand, the silencing mechanism D used in the indoor unit 100 according to Embodiment 11 as the silencing mechanism corresponding to the silencing mechanism A is the two microphones of the silencing mechanism A (noise detection microphone 161 and silencing effect detection microphone 191). Is replaced with one microphone (noise / silencing effect detection microphone 211). Similarly, in the silencing mechanism B of the indoor unit 100 according to Embodiment 8, two microphones (noise detection microphone 162 and silencing effect detection microphone 192) are used for active silencing. On the other hand, the silencing mechanism E used in the indoor unit 100 according to Embodiment 11 as the silencing mechanism corresponding to the silencing mechanism B is the two microphones of the silencing mechanism B (noise detection microphone 162 and silencing effect detection microphone 192). Is replaced with one microphone (noise / muffling effect detection microphone 212). In addition, since the signal processing method differs accordingly, the indoor unit 100 according to Embodiment 11 is provided with

signal processing devices

204 and 205 instead of the

signal processing devices

201 and 202. Note that the configuration of the

signal processing devices

204 and 205 is exactly the same as the configuration described in the second embodiment.

The method for suppressing the operation sound of the indoor unit 100 is exactly the same as in the second embodiment, and the control sound is output so that the noise detected by the noise / silence

effect detection microphones

211 and 212 approaches zero. The noise / silencing

effect detection microphones

211 and 212 operate to suppress noise.

As described in the eighth embodiment, in the active silencing method, the control sound from the

control speakers

181 and 182 is set so that the noise and the silencing

effect detection microphones

211 and 212 are opposite in phase to the noise at the installation locations (control points). Is output. For this reason, the silencing effect is high in the vicinity of the noise / silencing

effect detection microphones

211 and 212, but the phase of the control sound changes as the distance from the point increases. Therefore, at a location away from the noise / silence

effect detection microphones

211 and 212, the phase shift between the noise and the control sound becomes large and the silencing effect becomes low.

Note that the individual fan control of the fans 20A to 20C according to the eleventh embodiment is the same control as the blower fan control unit 171 described in the eighth embodiment.

As described above, in the indoor unit 100 including the plurality of fans 20A to 20C, the rotation speed of the

fans

20A and 20C, which are close to the noise / silence

effect detection microphones

211 and 212, is increased, and the noise / silence effect detection microphone 211 is obtained. , 212 and the fan 20B far away from each other, the noise and the silencing effect detection by the active silencing are increased. The noise near the

microphones

211 and 212 is increased, and the silencing effect by the active silencing is reduced. Noise reduction effect detection area The noise in a region away from the

microphones

211 and 212 can be reduced.

In other words, when active silencing is used, as described above, the noise / silencing

effect detection microphones

211 and 212 that serve as the control points for noise control and the surrounding silencing effects are enhanced, but the control speakers are located away from the control points. The phase shift between the control sound and noise radiated from 181 and 182 becomes large, and the silencing effect is lowered. However, in the eleventh embodiment, the indoor unit 100 is provided with a plurality of fans 20A to 20C, so that the

fans

20A and 20C that are close to the noise / silencing effect detection microphones 211 and 212 (noise with a high silencing effect). The number of rotations of the fan 20B (the fan that emits noise with a low noise reduction effect) far from the noise / silencing

effect detection microphones

211 and 212 can be reduced.

As a result, in the indoor unit 100 according to the eleventh embodiment, the region where the silencing effect is high further increases the silencing effect, and the region where the silencing effect is low reduces noise. Therefore, the indoor unit or fan using a single fan Compared with an indoor unit that does not perform individual control, noise radiated from the entire outlet 3 can be reduced. Furthermore, the indoor unit 100 according to the eleventh embodiment has aerodynamic performance degradation by individually controlling the rotational speeds of the fans 20A to 20C so that the airflow is constant when the rotational speed control is performed. Can be suppressed.

Further, as shown in FIGS. 48 and 49, the silencing effect can be further improved by dividing the air path of the indoor unit 100 into a plurality of regions.

FIG. 48 is a front view showing another example of the indoor unit according to Embodiment 11 of the present invention. FIG. 49 is a left side view of the indoor unit shown in FIG. FIG. 49 shows the side wall of the casing 1 of the indoor unit 100 in a transparent manner. The indoor unit 100 shown in FIGS. 48 and 49 divides the air path with the

partition plates

90 and 90a, thereby allowing the air blown by the fan 20A to pass through, the air passing through the fan 20B, and the air blown out by the fan 20C. It is divided into the areas where. The control speaker 181 and the noise / silencing effect detection microphone 211 of the silencing mechanism D are arranged in a region through which the air blown by the fan 20A passes. Further, the control speaker 182 and the noise / silencing effect detection microphone 212 of the silencing mechanism E are arranged in a region through which the air blown out by the fan 20C passes.

By configuring the indoor unit 100 in this way, the noise radiated from the fans 20A to 20C can be separated into the respective regions, and the silencing mechanism D reduces only the noise radiated from the fan 20A, and the silencing mechanism E reduces only the noise radiated from the fan 20C. For this reason, it is possible to prevent the noise emitted from the fan 20B from being detected by the noise / muffling

effect detection microphones

211 and 212, so that the crosstalk noise components of the noise / muffling

effect detection microphones

211 and 212 are reduced.

Furthermore, noise can be captured in one dimension because the air path is closer to the duct structure. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced, so that the silencing effect is further enhanced. Therefore, by configuring the indoor unit 100 as shown in FIGS. 48 and 49, noise can be further reduced compared to the configuration of FIG. 48 and 49, a partition plate is inserted in the entire air path. However, a part of the air path is separated by a partition plate, for example, only on the upstream side of the heat exchanger 50 or only on the downstream side of the heat exchanger 50. You may make it delimit.

In the eleventh embodiment, the noise / silence

effect detection microphones

211 and 212 are installed on the downstream side of the

control speakers

181 and 182, but the noise / silence

effect detection microphones

211 and 212 on the upstream side of the

control speakers

181 and 182. May be installed. Furthermore, in the eleventh embodiment, two control speakers, noise / muffling effect detection microphones, and two signal processing devices are arranged, but the present invention is not limited to this.

In the eleventh embodiment, the blower fan control means 171 is configured by the CPU 131 in the control device 281, but is configured by hardware such as LSI (Large Scale Integration) or FPGA (Field Programmable Gate Array). Also good. Further, the configuration of the blower fan control means 171 is not limited to the configuration shown in FIG. 37 as in the eighth embodiment.

Further, in the eleventh embodiment, the blower fan control means 171 increases the rotational speed of the

fans

20A and 20C that are close to the noise / silence

effect detection microphones

211 and 212 and the rotational speed of the fan 20B that is far away. Although it is configured to be lowered, it may be configured to perform either one of them.

As described above, in the indoor unit 100 according to the eleventh embodiment, the plurality of fans 20A to 20C are arranged, and the control device 281 (more specifically, the blower fan control means 171) controls the rotational speed of the fans 20A to 20C individually. ) Is provided. The blower fan control means 171 controls the

fan

20A, 20C blowing to the area in the vicinity of the noise / silence

effect detection microphones

211, 212, which is the area where the noise reduction effect is high, to increase the rotation speed, and the noise reduction effect is low. Rotational speed control is performed so as to reduce the rotational speed of the fan 20B that is blowing air to a region far from the noise / silence

effect detection microphones

211 and 212, which are regions. For this reason, the region where the silencing effect is high further increases the silencing effect, and the region where the silencing effect is low has low noise. For this reason, noise can be further reduced as compared with an indoor unit that uses a single fan with a silencing mechanism having the same configuration, or an indoor unit that does not perform individual fan control.

Further, the blower fan control means 171 controls the rotational speed of the fans 20A to 20C so that the amount of air radiated from the air outlet 3 is the same when the rotational speed control is the same as when the individual fan control is performed. Noise can be reduced without degrading aerodynamic performance.

partition plates

90 and 90a, the noise radiated from the fans 20A to 20C can be separated, respectively, and the silencing mechanism D is radiated from the fan 20A. The noise reduction mechanism E reduces only the noise radiated from the fan 20C. For this reason, the crosstalk noise component by the noise radiated | emitted from the fan 20B becomes small.

partition plates

90 and 90a, the air passage is brought closer to the duct structure, so that noise can be captured in one dimension. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced. Further, by reducing the rotational speed of the fan 20B not provided with the silencing mechanism, the noise in the area where the silencing mechanism is not provided is reduced, and a high noise reduction effect can be obtained as compared with the configuration of FIG. .

Furthermore, in the eleventh embodiment, since the

noise detection microphones

161 and 162 and the silencing

effect detection microphones

191 and 192 are integrated into the noise / silencing

effect detection microphones

211 and 212, the number of microphones can be reduced. Since the number of points can be reduced, the cost can be further reduced.

Embodiment 12 FIG.
Of course, the silencing mechanism shown in the eleventh embodiment may be used for the indoor unit shown in the ninth embodiment. In the twelfth embodiment, differences from the above-described eighth to eleventh embodiments will be mainly described, and the same parts as those in the eighth to eleventh embodiments are denoted by the same reference numerals. is doing.

FIG. 50 is a front view showing an indoor unit according to Embodiment 12 of the present invention.
The indoor unit 100 according to the twelfth embodiment is different from the indoor unit 100 according to the eleventh embodiment in that a silencing mechanism F (a control speaker 183, a noise / silencing effect detection microphone 213, and a signal processing device 206) is provided. Is a point. The configuration of the signal processing device 206 is exactly the same as that of the

signal processing devices

204 and 205.

Further, as in the ninth embodiment, a signal line (signal line for sending signals S1, S2, S3) connected from the signal processing devices 204 to 206 to the blower fan control means 172 is also provided. This is different from the indoor unit 100 of the form 11. Signals S 1, S 2, and S 3 sent from the signal processing devices 204 to 206 to the blower fan control means 172 are signals input from the noise / silence effect detection microphones 211 to 213 through the microphone amplifier 151 to the A / D converter 152. This is a digitally converted signal. That is, the signals S1, S2, and S3 are digital values of sound pressure levels detected by the noise / silence effect detection microphones 211 to 213.

The configuration of the blower fan control means 172 is the same as the configuration described in the ninth embodiment, and is the configuration shown in FIG. The blower fan control means 172 includes the same rotation speed determination means 133, a plurality of averaging means 136 (the same number as the mute effect detection microphone), a fan individual control rotation speed determination means 134A, and a plurality of SWs 135 (the same number as the fan 20). Yes. The rotation speed determination means 133 determines the rotation speed when all the fans 20A to 20C are operated at the same rotation speed based on the operation information input from the remote controller 280. The operation information input from the remote controller 280 is, for example, operation mode information such as a cooling operation mode, a heating operation mode, and a dehumidifying operation mode, and air volume information such as strong, medium, and weak. The averaging means 136 receives the digital values S1, S2 and S3 of the sound pressure levels detected by the muffler effect detection microphones 191 to 193, and averages these S1, S2 and S3 signals for a certain period of time. To do.

Next, the operation of the indoor unit 100 will be described.
The difference from the eleventh embodiment is only the operation of the blower fan control means 172. The operation of the blower fan control means 172 is as described in the ninth embodiment. That is, the digital values S1 to S3 of the sound pressure levels detected by the noise / silence effect detecting microphones 211 to 213 are averaged by the averaging means 136 for a certain period. Based on the averaged sound pressure level value and the rotation speed determined by the rotation speed determination means 133, the fan individual control rotation speed determination means 134A determines the rotation speed of each fan when performing fan individual control. To do. Specifically, the muffler effect detection with a small averaged sound pressure level value is detected by increasing the number of rotations of the fan that is close to (highly related to) the microphone with a small sound pressure level value and having a large averaged sound pressure level value. The rotation speed of the fan is determined so as to reduce the rotation speed of the fan that is close to the microphone (highly related). At this time, the rotation speeds of the fans 20A to 20C may be determined so that the air volume obtained in the individual fan control is the same as that in the same rotation speed control.

For example, in the indoor unit 100 according to the twelfth embodiment, the average value of the noise level detected by the noise / silence effect detection microphone 211 is 45 dB, the average value of the noise level detected by the noise / silence effect detection microphone 212 is 45 dB, When the average value of the noise level detected by the noise / silencing effect detection microphone 213 is 50 dB, the fan individual control rotation speed determination means 134A increases the rotation speed of the

fans

20A and 20C and decreases the rotation speed of the fan 20B. The number of rotations of each fan is determined as follows. Since the air volume and the rotational speed are in a proportional relationship, for example, in the case of the configuration shown in FIG. 50, if the rotational speed of the fan 20A and the fan 20C is increased by 10%, the rotational speed of the fan 20B is decreased by 20%. It becomes.

Note that the above-described method for determining the rotational speed of the fans 20A to 20C is merely an example. For example, the average value of the noise level detected by the noise / silence effect detection microphone 211 is 45 dB, the average value of the noise level detected by the noise / silence effect detection microphone 212 is 47 dB, and the noise detected by the noise / silence effect detection microphone 213 If the average value of the levels is 50 dB, the rotational speed of each fan is determined so that the rotational speed of the fan 20A is increased, the rotational speed of the fan 20B is decreased, and the rotational speed of the fan 20C is left as it is. Good. That is, the rotation speed of the fan 20A whose distance is close to the noise / silencing effect detection microphone 211 with the smallest detected noise level is increased, and the fan 20B whose distance is close to the noise / silence effect detection microphone 213 with the largest detected noise level. The rotational speed of each fan may be determined so that the rotational speed is lowered and the rotational speed of the fan 20C that is neither of them is left as it is.

When an operation information signal for performing individual fan control (for example, a signal such as a silent mode) is input from the remote controller 280, the rotational speed of each fan is individually controlled. That is, when an operation information signal for performing individual fan control (for example, a signal such as a silent mode) is input from the remote controller 280, the rotation control in the individual fan control is performed from the rotation control signal of the same rotation speed control by switching the SW 135. The rotation control signal is output from the control device 281 to the fans 20A to 20C. The rotation control signal output from the control device 281 is input to the motor drivers 282A to 282C, and the fans 20A to 20C are controlled to the number of rotations according to the rotation control signal.

Here, in the case of the indoor unit 100 according to the twelfth embodiment, as in the ninth embodiment, the magnitude of the crosstalk noise component from the adjacent fan is larger than that in the vicinity of the noise / silencing effect detection microphone 213 due to the magnitude of the crosstalk noise component. Thus, the noise reduction effect is enhanced in the area near the noise / silence

effect detection microphones

211 and 212. That is, the noise level detected in the area near the noise / silence

effect detection microphones

211 and 212 is smaller than that in the area near the noise / silence effect detection microphone 213. On the other hand, in the area near the noise / silence effect detection microphone 213, the noise reduction effect is low. Therefore, in the indoor unit 100 according to the twelfth embodiment having the plurality of fans 20A to 20C, the detected noise level among the average values of the noise level values detected by the noise / silence effect detecting microphones 211 to 213 is detected. The rotation speed of the

fans

20A, 20C close to the noise / silence

effect detection microphones

211, 212 having a small average value is increased, and the detected noise / silence effect detection microphone 213 having a large average noise level is detected. The rotation speed is lowered.

As a result, in the indoor unit 100 according to the twelfth embodiment, the region where the silencing effect is high further increases the silencing effect, and the region where the silencing effect is low reduces noise. Therefore, the indoor unit or fan using a single fan Compared with an indoor unit that does not perform individual control, noise radiated from the entire outlet 3 can be reduced. Furthermore, the indoor unit 100 according to the twelfth embodiment has aerodynamic performance degradation by individually controlling the rotational speeds of the fans 20A to 20C so that the airflow is constant when the rotational speed control is performed. Can be suppressed.

Furthermore, as shown in FIG. 51 and FIG. 52, the silencing effect can be further improved by dividing the air path of the indoor unit 100 into a plurality of regions.

FIG. 51 is a front view showing another example of the indoor unit according to Embodiment 12 of the present invention. FIG. 52 is a left side view of the indoor unit shown in FIG. FIG. 52 shows the side wall of the casing 1 of the indoor unit 100 in a translucent manner. The indoor unit 100 shown in FIGS. 51 and 52 divides the air path with the

partition plates

90 and 90a, thereby allowing the air blown by the fan 20A to pass through, the air passing through the fan 20B, and the air blown out by the fan 20C. It is divided into the areas where. The control speaker 181 and the noise / silencing effect detection microphone 211 of the silencing mechanism D are arranged in a region through which the air blown by the fan 20A passes. Further, the control speaker 182 and the noise / silencing effect detection microphone 212 of the silencing mechanism E are arranged in a region through which the air blown out by the fan 20C passes. Further, the control speaker 183 and the noise / silencing effect detection microphone 213 of the silencing mechanism F are arranged in a region through which the air blown out by the fan 20B passes.

By configuring the indoor unit 100 in this way, the noise radiated from the fans 20A to 20C can be separated into the respective regions, and the silencing mechanism D reduces only the noise radiated from the fan 20A, and the silencing mechanism E reduces only the noise radiated from the fan 20C, and the silencing mechanism F reduces only the noise radiated from the fan 20B. For this reason, the crosstalk noise component (noise radiated from the fan provided in the adjacent flow path) detected by the noise / silencing effect detection microphones 211 to 213 is reduced.

Furthermore, noise can be captured in one dimension because the air path is closer to the duct structure. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced, so that the silencing effect is further enhanced. Therefore, by configuring the indoor unit 100 as shown in FIGS. 51 and 52, noise can be further reduced compared to the configuration of FIG. 51 and 52, a partition plate is inserted in the entire air path. However, a part of the air path is separated by a partition plate, for example, only on the upstream side of the heat exchanger 50 or only on the downstream side of the heat exchanger 50. You may make it delimit. Similarly to the eleventh embodiment, even when there is a fan 20 that is not provided with a silencing mechanism as shown in FIG. 53, the noise in the area where the silencing mechanism is not provided by reducing the rotation speed of the fan 20. Can be reduced, and a similar silencing effect can be obtained.

In the twelfth embodiment, the noise / silencing effect detection microphones 211 to 213 are installed on the downstream side of the control speakers 181 to 183, but the noise / silence effect detection microphones 211 to 213 are installed on the upstream side of the control speakers 181 to 183. May be installed. Furthermore, in the twelfth embodiment, two to three control speakers, noise / muffling effect detection microphones, and signal processing devices are arranged, but the present invention is not limited to this.

In the twelfth embodiment, the blower fan control unit 172 is configured by the CPU 131 in the control device 281, but is configured by hardware such as LSI (Large Scale Integration) or FPGA (Field Programmable Gate Array). Also good. Further, the configuration of the blower fan control means 172 is not limited to the configuration shown in FIG. 41 as in the ninth embodiment.

In the twelfth embodiment, the blower fan control means 172 increases the number of rotations of a fan that is close to the noise / silence effect detection microphone with a low noise level and also has a noise / silence effect detection microphone with a large noise level. Although the configuration is such that the number of rotations of a fan with a short distance is reduced, it may be configured to perform either one of them.

As described above, in the indoor unit 100 according to the twelfth embodiment, the plurality of fans 20A to 20C are arranged, and the control device 281 for controlling the rotational speed of the fans 20A to 20C individually (more specifically, the blower fan control means 172). ) Is provided. The blower fan control means 172 increases the rotation speed of the fan whose distance is close to the noise / silence effect detection microphone having a small detected noise level among the average values of the noise levels detected by the noise / silence effect detection microphones 211 to 213. Thus, the rotational speed control is performed so as to reduce the rotational speed of the blower fan that is close to the noise / silencing effect detection microphone having a large detected noise level. For this reason, the region where the silencing effect is high (that is, the noise level is small) is further enhanced, and the region where the silencing effect is low (that is, the noise level is large) is low. For this reason, noise can be further reduced as compared with an indoor unit that uses a single fan with a silencing mechanism having the same configuration, or an indoor unit that does not perform individual fan control.

Further, the blower fan control means 172 controls the rotational speed of the fans 20A to 20C so that the amount of air radiated from the blowout port 3 is the same when the same rotational speed control is performed as when the individual fan control is performed. Noise can be reduced without degrading aerodynamic performance.

partition plates

90 and 90a, the noise radiated from the fans 20A to 20C can be separated, respectively, and the silencing mechanism D is radiated from the fan 20A. The noise reduction mechanism E reduces only the noise emitted from the fan 20C, and the noise reduction mechanism F reduces only the noise emitted from the fan 20B. For this reason, in each area | region, the crosstalk noise component by the noise radiated | emitted to the adjacent area | region becomes small.

partition plates

90 and 90a, the air passage is brought closer to the duct structure, so that noise can be captured in one dimension. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced. Therefore, the silencing effect in the noise / silencing effect detection microphones 211 to 213 is increased, and noise can be further reduced as compared with the configuration of FIG. Further, even when there is a fan 20 that is not provided with a silencing mechanism, by reducing the rotation speed of the fan 20, noise in a region where the silencing mechanism is not provided is reduced, and a similar silencing effect can be obtained. .

Further, in the twelfth embodiment, since the noise detection microphones 161 to 163 and the silencing effect detection microphones 191 to 193 are integrated into the noise / silencing effect detection microphones 211 to 213, the number of microphones can be reduced, and the parts can be reduced. The number of points can be reduced and the cost can be further reduced.

Embodiment 13 FIG.
In the eighth to twelfth embodiments, a noise releasing effect detection microphone or a noise / silence effect detection microphone that emits highly relevant noise (that is, the silence effect detection microphone or the noise / silence effect detection microphone has a silence effect). The fan that emits noise that can be easily exerted is a fan that is close to the mute effect detection microphone or the noise / mute effect detection microphone. Not limited to this, a fan that emits noise that is highly relevant to the mute effect detection microphone or the noise / mute effect detection microphone (that is, the mute effect detection microphone or the noise / mute effect detection microphone emits noise that can easily exert a mute effect) Fan) may be the following fan. In the thirteenth embodiment, an air conditioner according to the eighth embodiment will be described as an example. In the thirteenth embodiment, differences from the above-described eighth to twelfth embodiments will be mainly described, and the same parts as those in the eighth to twelfth embodiments are denoted by the same reference numerals. is doing.

As described above, the basic configuration of the indoor unit 100 according to the thirteenth embodiment is the same as that of FIG. 35 described in the eighth embodiment. The indoor unit 100 according to the thirteenth embodiment is different from the indoor unit 100 according to the eighth embodiment in that the blower fan information input to the memory 132 of the control device 281 is different. That is, the indoor unit 100 according to the thirteenth embodiment is different from the indoor unit 100 according to the eighth embodiment in that the blower fan information input from the memory 132 to the fan individual control rotation speed determining means 134 is different.

Further, although the detailed installation configuration of the

control speakers

181 and 182 on the side surface of the indoor unit 100 has not been described in the eighth embodiment, in the thirteenth embodiment, the

control speakers

181 and 182 are installed as follows. It is installed on 100 sides.
Since the

control speakers

181 and 182 have a certain thickness, if they are installed on the front surface or the rear surface of the indoor unit 100, the air passage is blocked, leading to deterioration of aerodynamic performance. For this reason, in the thirteenth embodiment,

control speakers

181 and 182 are arranged in a machine box (a box in which a control board or the like is stored, not shown) provided on both side portions of the casing 1. By arranging the

control speakers

181 and 182 in this way, the

control speakers

181 and 182 can be prevented from protruding into the air path.

More specifically, in the eighth embodiment, the identification number of the fan 20 that is close to the mute

effect detection microphones

191 and 192 is used as the blower fan information. On the other hand, in Embodiment 13, the identification numbers of the fans 20 installed at both ends of the casing 1 of the indoor unit 100 are used as the blower fan information. That is, as can be seen from FIG. 35, the blower fan information in the thirteenth embodiment is the identification number of the fan 20A and the fan 20C.

The operation in the indoor unit 100 is the same as the operation described in the eighth embodiment. Therefore, hereinafter, individual fan control of the fans 20A to 20C will be described.

Similarly to the eighth embodiment, the fan individual control rotation speed determination means 134 of the blower fan control means 171 is based on the rotation speed information determined by the rotation speed determination means 133 and the blower fan information read from the memory 132. The number of rotations of each fan 20 when performing individual control is determined. Specifically, the fan individual control rotation speed determination means 134 increases the rotation speed of the

fans

20A and 20C whose identification number is input to the memory 132, and the rotation speed of the fan 20B whose identification number is not input to the memory 132. Lower. As a result, the fan individual control rotation speed determining means 134 increases the rotation speed of the

fans

20A and 20C installed at both ends of the casing 1 of the indoor unit 100, and is installed at other than both ends of the casing 1 of the indoor unit 100. The rotation speed of the fan 20B is reduced. At this time, the rotation speeds of the fans 20A to 20C may be determined so that the air volume obtained in the individual fan control is the same as that in the same rotation speed control.

Crosstalk noise when detecting noise from the

fans

20A and 20C at both ends is actively silenced when noise from the fans 20B other than both ends is actively silenced. The ingredients are different. This is because when noise radiated from the fan 20B is detected, noise radiated from the

adjacent fans

20A and 20C also enters as a crosstalk noise component. For this reason, in the thirteenth embodiment, the indoor unit 100 is configured to include a plurality of fans 20A to 20C, and at the time of noise detection, the rotational speeds of the

fans

20A and 20C at both ends having a small crosstalk noise component are increased to detect noise. Sometimes the rotational speed of the fan 20B other than both ends where the crosstalk noise component is large is lowered.

As a result, the indoor unit 100 according to the thirteenth embodiment has a higher silencing effect in a region where the silencing effect is high, and noise is small in a region where the silencing effect is low. Therefore, the indoor unit or fan using a single fan Compared with an indoor unit that does not perform individual control, noise radiated from the entire outlet 3 can be reduced. Furthermore, the indoor unit 100 according to the thirteenth embodiment has aerodynamic performance degradation by individually controlling the rotational speeds of the plurality of fans 20A to 20C so that the airflow is constant when the rotational speed is controlled. Can be suppressed.

Furthermore, in the thirteenth embodiment, the

control speakers

181 and 182 are installed on both side surfaces of the indoor unit 100 so that the

control speakers

181 and 182 do not protrude into the air path. For this reason, it is possible to prevent pressure loss caused by the

control speakers

181 and 182 protruding into the air path, and to prevent aerodynamic performance deterioration.

Furthermore, in the indoor unit 100 according to the thirteenth embodiment, as with the indoor unit 100 shown in FIGS. 38 and 39 in the eighth embodiment, the air path of the indoor unit 100 is divided into a plurality of regions. Further, the silencing effect can be further improved.

That is, by dividing the air path of the indoor unit 100 into a plurality of regions by the

partition plates

90 and 90a, the noise radiated from the fans 20A to 20C can be separated into the respective regions, and the silencing mechanism A is used in the fan 20A. Only the noise radiated from the fan 20C is reduced, and the silencing mechanism B reduces only the noise radiated from the fan 20C. Therefore, it is possible to prevent the

noise detection microphones

161 and 162 and the silencing

effect detection microphones

191 and 192 from detecting the noise radiated from the fan 20B, and thus the

noise detection microphones

161 and 162 and the silencing

effect detection microphones

191 and 192. The crosstalk noise component of becomes smaller.

Furthermore, noise can be captured in one dimension because the air path is closer to the duct structure. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced, so that the silencing effect is further enhanced. On the other hand, by reducing the rotational speed of the fan 20B that is not provided with the silencing mechanism, the noise in the area where the silencing mechanism is not provided is reduced. Therefore, also in the indoor unit 100 according to the thirteenth embodiment, by dividing the air path of the indoor unit 100 into a plurality of regions, noise can be further reduced compared to the configuration of FIG. Note that the partition plate does not need to be provided in the entire air path, and a part of the air path may be partitioned by the partition plate, for example, only on the upstream side of the heat exchanger 50 or only on the downstream side of the heat exchanger 50. Good.

In the thirteenth embodiment, the

noise detection microphones

161 and 162 are installed on both sides of the indoor unit 100. However, the

noise detection microphones

161 and 162 may be installed anywhere as long as they are upstream of the

control speakers

181 and 182. Furthermore, in the thirteenth embodiment, the silencing

effect detection microphones

191 and 192 are arranged on substantially the extension lines of the rotation axes of the

fans

20A and 20C, but the silencing

effect detection microphones

191 and 191 are provided on the downstream side of the

control speakers

181 and 182. The installation position of 192 may be anywhere. Furthermore, in the thirteenth embodiment, two noise detection microphones, control speakers, muffler effect detection microphones, and signal processing devices are arranged, but the present invention is not limited to this.

In the thirteenth embodiment, the blower fan control means 171 is configured by the CPU 131 in the control device 281. However, the blower fan control means 171 is implemented by hardware such as LSI (Large Scale Integration) or FPGA (Field Programmable Gate Array). May be configured. Further, the configuration of the blower fan control means 171 is not limited to the configuration shown in FIG.

Further, in the thirteenth embodiment, the blower fan control means 171 is configured to increase the rotation speed of the

fans

20A and 20C at both ends of the indoor unit 100 and to decrease the rotation speed of the fan 20B other than both ends. However, you may comprise so that either one may be performed.

As described above, in the indoor unit 100 according to the thirteenth embodiment, the plurality of fans 20A to 20C are arranged, and the blower fan control means 171 for individually controlling the rotation speed of the fans 20A to 20C is provided. The blower fan control means 171 controls the

fan

20A, 20C installed at both ends of the indoor unit 100 to increase the rotation speed, and reduces the rotation speed of the fan 20B installed outside the both ends of the indoor unit 100. Rotational speed control is performed as follows. For this reason, the region where the crosstalk noise component from the adjacent fan is small and the silencing effect is high further increases the silencing effect, and the region where the crosstalk noise component is large and the silencing effect is low decreases the noise. For this reason, a high noise reduction effect can be obtained as compared with an indoor unit that uses a single fan with the silencer mechanism having the same configuration or an indoor unit that does not perform individual fan control.

Furthermore, the

control speakers

partition plates

Embodiment 14 FIG.
Of course, the blower fan information shown in the thirteenth embodiment may be used for the indoor unit according to the eleventh embodiment. In the fourteenth embodiment, differences from the above-described eighth to thirteenth embodiments will be mainly described, and the same parts as those in the eighth to thirteenth embodiments are denoted by the same reference numerals. is doing.

The basic configuration of the indoor unit 100 according to Embodiment 14 is the same as that in FIG. 47 described in Embodiment 11. The indoor unit 100 according to the fourteenth embodiment is different from the indoor unit 100 according to the eleventh embodiment in that the blower fan information input to the memory 132 of the control device 281 is different. More specifically, in the fourteenth embodiment, the identification numbers of the fans 20 installed at both ends of the casing 1 of the indoor unit 100 are used as the blower fan information. That is, as can be seen from FIG. 47, the blower fan information in the fourteenth embodiment is the identification number of the fan 20A and the fan 20C.

Although the eleventh embodiment does not describe the detailed installation configuration of the

control speakers

181 and 182 on the side surface of the indoor unit 100, in the fourteenth embodiment, the

control speakers

181 and 182 are connected as follows. It is installed on 100 sides.
Since the

control speakers

181 and 182 have a certain thickness, if they are installed on the front surface or the rear surface of the indoor unit 100, the air passage is blocked, leading to deterioration of aerodynamic performance. For this reason, in the fourteenth embodiment,

control speakers

181 and 182 in this way, the

control speakers

181 and 182 can be prevented from protruding into the air path.

The operation in the indoor unit 100 is the same as the operation described in the eleventh embodiment. Therefore, hereinafter, individual fan control of the fans 20A to 20C will be described.

The fan individual control rotation speed determination means 134 of the blower fan control means 171 is based on the rotation speed information determined by the rotation speed determination means 133 and the blower fan information read from the memory 132, as in the eleventh embodiment. The number of rotations of each fan when performing individual control is determined. Specifically, the fan individual control rotation speed determination means 134 increases the rotation speed of the

fans

Crosstalk noise when detecting noise from the

fans

adjacent fans

20A and 20C also enters as a crosstalk noise component. For this reason, in the fourteenth embodiment, the indoor unit 100 is provided with a plurality of fans 20A to 20C, and the rotational speeds of the

fans

20A and 20C at both ends having a small crosstalk noise component are increased during noise detection to detect noise. Sometimes the rotational speed of the fan 20B other than both ends where the crosstalk noise component is large is lowered.

As a result, in the indoor unit 100 according to the fourteenth embodiment, an area with a high silencing effect has a higher silencing effect, and an area with a low silencing effect has a low noise level. Therefore, an indoor unit or fan that uses a single fan. Compared with an indoor unit that does not perform individual control, noise radiated from the entire outlet 3 can be reduced. Furthermore, in the indoor unit 100 according to Embodiment 14, the aerodynamic performance is deteriorated by individually controlling the rotational speeds of the fans 20A to 20C so that the airflow is constant when the rotational speed is controlled. Can be suppressed.

Further, in the fourteenth embodiment, the

control speakers

Furthermore, in the indoor unit 100 according to the fourteenth embodiment, as with the indoor unit 100 shown in FIGS. 48 and 49 of the eleventh embodiment, the air path of the indoor unit 100 is divided into a plurality of regions. Further, the silencing effect can be further improved.

partition plates

90 and 90a, the noise radiated from the fans 20A to 20C can be separated into the respective regions, and the silencing mechanism D is used in the fan 20A. Only the noise radiated from the fan 20C is reduced, and the silencing mechanism E reduces only the noise radiated from the fan 20C. For this reason, it is possible to prevent the noise / silencing

effect detection microphones

211 and 212 emitted from the fan 20B from being detected, so that the crosstalk noise component of the noise / silence

effect detection microphones

211 and 212 is reduced.

Furthermore, noise can be captured in one dimension because the air path is closer to the duct structure. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced, so that the silencing effect is further enhanced. On the other hand, by reducing the rotational speed of the fan 20B that is not provided with the silencing mechanism, the noise in the area where the silencing mechanism is not provided is reduced. Therefore, also in the indoor unit 100 according to the fourteenth embodiment, by dividing the air path of the indoor unit 100 into a plurality of regions, noise can be further reduced compared to the configuration of FIG. Note that the partition plate does not need to be provided in the entire air path, and a part of the air path may be partitioned by the partition plate, for example, only on the upstream side of the heat exchanger 50 or only on the downstream side of the heat exchanger 50. Good.

In the fourteenth embodiment, the noise / silence

effect detection microphones

211 and 212 are installed on the downstream side of the

control speakers

181 and 182, but the noise / silence

effect detection microphones

211 and 212 on the upstream side of the

control speakers

181 and 182. May be installed. Furthermore, in the fourteenth embodiment, two control speakers, noise / muffling effect detection microphones, and two signal processing devices are arranged, but the present invention is not limited to this.

In the fourteenth embodiment, the blower fan control means 171 is configured by the CPU 131 in the control device 281, but is configured by hardware such as LSI (Large Scale Integration) or FPGA (Field Programmable Gate Array). Also good. Further, the configuration of the blower fan control means 171 is not limited.

In the fourteenth embodiment, the blower fan control means 171 is configured to increase the rotational speed of the

fans

20A and 20C at both ends of the indoor unit 100 and to decrease the rotational speed of the fan 20B other than both ends. However, you may comprise so that either one may be performed.

As described above, in the indoor unit 100 according to the fourteenth embodiment, the plurality of fans 20A to 20C are arranged, and the blower fan control means 171 for individually controlling the rotational speed of the fans 20A to 20C is provided. The blower fan control means 171 controls the

fan

20A, 20C installed at both ends of the indoor unit 100 to increase the rotation speed, and reduces the rotation speed of the fan 20B installed outside the both ends of the indoor unit 100. Rotational speed control is performed as follows. For this reason, the region where the crosstalk noise from the adjacent fan is small and the silencing effect is high is further enhanced, and the region where the crosstalk noise is large and the silencing effect is low is low. For this reason, noise can be further reduced as compared with an indoor unit that uses a single fan with a silencing mechanism having the same configuration, or an indoor unit that does not perform individual fan control.

Furthermore, the

control speakers

partition plates

Furthermore, in the fourteenth embodiment, since the

noise detection microphones

161 and 162 and the silencing

effect detection microphones

191 and 192 are integrated into the noise / silencing

effect detection microphones

Embodiment 15 FIG.
When performing individual fan control according to the silencing effect of the silencing effect detection microphone or the noise / silencing effect detection microphone, for example, the individual fan control may be performed as follows. In the fifteenth embodiment, differences from the above-described eighth to fourteenth embodiments will be mainly described, and the same parts as those in the eighth to fourteenth embodiments are denoted by the same reference numerals. is doing.

FIG. 54 is a front view showing an indoor unit according to Embodiment 15 of the present invention.
The indoor unit 100 according to the fifteenth embodiment is different from the indoor unit 100 according to the ninth embodiment only in the configuration of the blower fan control means 174.

The blower fan control means 174 according to the fifteenth embodiment will be described.
FIG. 55 is a block diagram showing a control apparatus according to Embodiment 15 of the present invention. Various operations and means described below are performed by executing a program incorporated in the control device 281 included in the indoor unit 100. Similar to the configuration described in the eighth to fourteenth embodiments, the control device 281 mainly includes an input unit 130 for inputting a signal from an external input device such as the remote controller 280, a CPU 131 for performing an operation according to an embedded program, A memory 132 for storing data and programs is provided. Furthermore, the CPU 131 according to the fifteenth embodiment includes a blower fan control unit 174.

The blower fan control means 174 includes the same rotation speed determination means 133, a plurality of silence volume calculation means 138 (the same number as the silencing effect detection microphone), a fan individual control rotation speed determination means 134C, and a plurality of SW 135 (the same number as the fan 20). ing. The rotation speed determination means 133 determines the rotation speed when all the fans 20A to 20C are operated at the same rotation speed based on the operation information input from the remote controller 280. The operation information input from the remote controller 280 is, for example, operation mode information such as a cooling operation mode, a heating operation mode, and a dehumidifying operation mode, and air volume information such as strong, medium, and weak. The muffling volume calculation means 138 receives the digital values S1, S2 and S3 of the sound pressure levels detected by the muffling effect detection microphones 191 to 193, and calculates the muffling volume from these S1, S2 and S3 signals. To do.

The individual fan control rotation speed determination means 134C is based on the silence volume calculated by the silence volume calculation means 138 and the blower fan information stored in the memory 132, and each revolution speed when the fans 20A to 20C are individually controlled. Is to determine. The blower fan information is information on the fan 20 that is highly related to the muffler effect detection microphones 191 to 193. The SW 135 switches the rotation control signals of the fans 20A to 20C sent to the motor drivers 282A to 282C, for example, based on a signal input from the remote controller 280. That is, the SW 135 switches whether the fans 20A to 20C are all operated at the same rotational speed (whether the same rotational speed is controlled) or whether the fans 20A to 20C are respectively operated at individual rotational speeds (whether the fan is individually controlled). Is.

FIG. 56 is a block diagram showing a muffled sound level calculation means according to Embodiment 15 of the present invention.
The muffled sound volume calculating means 138 averages the input signal (S1, S2 or S3), and the pre-control sound pressure level for storing the sound pressure level before starting the active mute control. A storage unit 139 and a differentiator 140 are provided.

In the indoor unit 100 according to the fifteenth embodiment, the silencing effect detection microphone 193 also includes noise (crosstalk noise component) radiated from the

adjacent fans

20A and 20C in addition to the noise radiated from the fan 20B. Come in. On the other hand, the crosstalk noise component detected by the silencing

effect detection microphones

191 and 192 have only one adjacent fan (fan 20B). For this reason, the silencing effect of the silencing mechanisms A and B is higher than that of the silencing mechanism C.

Next, individual fan control of the fans 20A to 20C according to the fifteenth embodiment will be described.
Operation information selected by the remote controller 280 is input to the control device 281. As described above, the operation information is, for example, operation mode information such as a cooling operation mode, a heating operation mode, and a dehumidifying operation mode. Further, the air volume information such as strong, medium, and weak is similarly input as operation information from the remote controller 280 to the control device 281. The operation information input to the control device 281 is input to the rotation speed determination unit 133 via the input unit 130. The same rotation speed determining means 133 to which the operation information is input determines the rotation speed when the fans 20A to 20C are controlled at the same rotation speed from the input operation information. When the individual fan control is not performed, all the fans 20A to 20C are controlled at the same rotational speed.

On the other hand, S1 to S3 (the digital value of the sound pressure level detected by the mute effect detection microphones 191 to 193) is input from the signal processing devices 201 to 203 to the averaging unit 136 to the mute volume calculation unit 138. Further, the sound dead volume calculating means 138 averages the sound pressure level detected by the sound deadening effect detecting microphones 191 to 193 for a certain period of time before performing the active sound deadening control, and the averaged sound pressure level is averaged. This is stored in the pre-control sound pressure level storage means 139. Next, the silence volume calculation means 138 averages the sound pressure levels detected by the silence effect detection microphones 191 to 193 during the active silence control by the averaging means 136 for a certain period.

Then, the muffled sound volume calculation means 138 reads “the sound pressure level obtained by averaging the sound pressure levels detected by the mute effect detection microphones 191 to 193 during the active mute control for a certain period of time by the averaging means 136” and “active mute control. Difference from “the sound pressure level obtained by averaging the sound pressure levels detected by the muffler effect detection microphones 191 to 193 before being performed by the averaging means 136 for a certain period” (stored in the pre-control sound pressure level storage means 139) From the above, the silence volume is calculated. The silence volume calculated by the silence volume calculation means 138 is input to the fan individual control rotation speed determination means 134C.

The memory 132 stores air blower information. The blower fan information is information on the fan 20 that emits noise most relevant to the sound detected by the muffler effect detection microphones 191 to 193. These identification numbers are assigned to each silencing effect detection microphone. In the fifteenth embodiment, the identification number serving as the blower fan information is obtained as follows. For example, it is confirmed which sound detected by the muffler effect detection microphone 191 is most relevant to which of the noises radiated from the fans 20A to 20C. When the sound detected by the silencing effect detection microphone 191 is most relevant to the noise emitted from the fan 20A, the blower fan information corresponding to the silencing effect detection microphone 191 is an identification number indicating the fan 20A. Similarly, corresponding blowing fan information is determined for the silencing

effect detection microphones

192 and 193 and stored in the memory 132 in advance.

The determination of the blower fan information may be performed as follows, for example. For example, the noise detected from the fans 20A to 20C is detected by a microphone that accurately detects the fans 20A to 20C in a state in which the fans 20A to 20C are operated before product shipment. Then, the coherence value between the sound detected by these microphones and the sound detected by the mute effect detection microphone 191 is measured. Thereafter, the microphone of the detection value having the highest coherence value with respect to the detection value of the muffler effect detection microphone 191 is determined. The identification number of the fan 20 that emits noise detected by the microphone is the blower fan information corresponding to the silencing effect detection microphone 191. The blower fan information corresponding to the silencing

effect detection microphones

192 and 193 may be determined in the same manner.

Further, the determination of the blower fan information may be performed as follows, for example. Coherence calculation means 137 as shown in the tenth embodiment is mounted on the blower fan control means 174 of the indoor unit 100. Then, during operation after product shipment, the coherence value between the detection values of the noise detection microphones 161 to 163 and the detection values of the silencing effect detection microphones 191 to 193 is measured. The identification number of the fan 20 that is closest to the noise detection microphone having the highest coherence value for each of the mute effect detection microphones 191 to 193 may be used as the blower fan information.

Note that the method of determining the blower fan information is not limited to the above method. Any method can be used as long as it can identify the fan that emits the noise most closely related to the sound detected by the muffler effect detection microphones 191 to 193.

The silence volume calculated by the silence volume calculation means 138 and the blower fan information stored in the memory 132 are input to the fan individual control rotation speed determination means 134C. Based on these pieces of information, the individual fan control rotation speed determination means 134C determines the rotation speed of each fan when performing individual fan control. Specifically, the fan that is highly relevant to the sound detected by the muffler effect detection microphone with a high mute volume is increased, and the fan that is highly relevant to the sound detected by the muffler effect detection microphone with a low muffler volume is set. The number of rotations of the fan is determined so as to reduce the number of rotations. At this time, the rotation speeds of the fans 20A to 20C may be determined so that the air volume obtained in the individual fan control is the same as that in the same rotation speed control.

For example, in the indoor unit 100 according to the fifteenth embodiment, the fan 20A that radiates noise most highly relevant to the sound detected by the muffler effect detection microphone 191 is the fan 20A, and is detected by the muffler effect detection microphone 192. It is assumed that the fan radiating the noise most relevant to the sound is the fan 20C, and the fan radiating the noise most relevant to the sound detected by the mute effect detection microphone 193 is the fan 20B. It is assumed that the muffled sound volume in the muffling effect detection microphone 191 is -5 dB, the muffled sound volume in the muffling effect detection microphone 192 is -5 dB, and the muffled sound volume in the muffling effect detection microphone 193 is -2 dB. In this case, the fan individual control rotation speed determination means 134C determines the rotation speed of each fan so as to increase the rotation speed of the

fans

20A and 20C and decrease the rotation speed of the fan 20B. Since the air volume and the rotational speed are in a proportional relationship, for example, in the case of the configuration shown in FIG. 54, if the rotational speed of the fan 20A and the fan 20C is increased by 10%, the rotational speed of the fan 20B is decreased by 20%. It becomes.

Note that the above-described method for determining the rotational speed of the fans 20A to 20C is merely an example. For example, in the indoor unit 100 according to the fifteenth embodiment, the fan 20A that radiates noise most highly relevant to the sound detected by the muffler effect detection microphone 191 is the fan 20A, and is detected by the muffler effect detection microphone 192. It is assumed that the fan radiating the noise most relevant to the sound is the fan 20C, and the fan radiating the noise most relevant to the sound detected by the mute effect detection microphone 193 is the fan 20B. Then, it is assumed that the muffled sound volume in the muffling effect detection microphone 191 is −5 dB, the muffled sound volume in the muffling effect detection microphone 192 is −3 dB, and the muffled sound volume in the muffling effect detection microphone 193 is −2 dB. In this case, the rotational speed of each fan may be determined such that the rotational speed of the fan 20A is increased, the rotational speed of the fan 20B is decreased, and the rotational speed of the fan 20C is left as it is. That is, the rotation speed of the fan 20A having high relevance to the muffler effect detection microphone 191 having the highest muffle volume is increased, and the rotation speed of the fan 20B having high relevance to the muffler effect detection microphone 193 having the lowest muffle volume is decreased. The rotation speed of each fan may be determined so that the rotation speed of the fan 20C which is neither of them is left as it is.

As described above, in the case of the indoor unit 100 according to the fifteenth embodiment, the silencing effect detection microphone is compared with the region near the silencing effect detection microphone 193 due to the magnitude of the crosstalk noise component from the adjacent fan. The area near 191 and 192 has a large amount. On the other hand, in the area near the silencing effect detection microphone 193, the silencing volume is small. Therefore, in the indoor unit 100 according to the fifteenth embodiment provided with a plurality of fans 20A to 20C, the

fans

20A and 20C that radiate highly relevant noise to the silencing

effect detection microphones

191 and 192 having a large silencing level. , And the rotation speed of the fan 20B that emits highly relevant noise to the muffler effect detection microphone 193 with a low muffled sound volume is lowered.

As a result, in the indoor unit 100 according to the fifteenth embodiment, an area with a high silencing effect has a higher silencing effect, and an area with a low silencing effect has less noise. Compared with an indoor unit that does not perform individual control, noise radiated from the entire outlet 3 can be reduced. Furthermore, in the indoor unit 100 according to the fifteenth embodiment, aerodynamic performance is degraded by individually controlling the rotational speeds of the plurality of fans 20A to 20C so that the airflow is constant when the rotational speed control is performed. Can be suppressed.

Furthermore, in the indoor unit 100 according to the fifteenth embodiment, as with the indoor unit 100 shown in FIGS. 42 and 43 of the ninth embodiment, the air path of the indoor unit 100 is divided into a plurality of regions. Further, the silencing effect can be further improved.

partition plates

90 and 90a, the noise radiated from the fans 20A to 20C can be separated into the respective regions, and the silencing mechanism A is used in the fan 20A. Only the noise radiated from the fan 20C is reduced, the silencer mechanism B reduces only the noise radiated from the fan 20C, and the silencer mechanism C reduces only the noise radiated from the fan 20B. For this reason, the crosstalk noise components (noise radiated from the fans provided in the adjacent flow paths) detected by the noise detection microphones 161 to 163 and the silencing effect detection microphones 191 to 193 are reduced.

Furthermore, noise can be captured in one dimension because the air path is closer to the duct structure. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced, so that the silencing effect is further enhanced. Therefore, also in the indoor unit 100 according to the fifteenth embodiment, by dividing the air path of the indoor unit 100 into a plurality of regions, noise can be further reduced compared to the configuration of FIG. On the other hand, when there is a fan that is not provided with a silencing mechanism, noise in an area where the silencing mechanism is not provided is reduced by lowering the rotation speed of the fan 20, and the same effect can be obtained. 42 and 43, a partition plate is inserted in the entire air path. However, a part of the air path is separated by a partition plate, for example, only on the upstream side of the heat exchanger 50 or only on the downstream side of the heat exchanger 50. You may make it delimit.

In the fifteenth embodiment, the muffling effect detection microphones 191 to 193 are arranged almost on the extension line of the rotation axis of the fans 20A to 20C. The installation position of 193 may be anywhere. Furthermore, in the fifteenth embodiment, three noise detection microphones, control speakers, muffler effect detection microphones, and signal processing devices are arranged, but the present invention is not limited to this.

In the fifteenth embodiment, the blower fan control means 174 is configured by the CPU 131 in the control device 281, but may be configured by hardware such as LSI (Large Scale Integration) or FPGA (Field Programmable Gate Array). . Further, the configuration of the blower fan control means 174 is not limited to the configuration shown in FIGS. 55 and 56.

Further, in the fifteenth embodiment, the blower fan control means 174 increases the rotation speed of the fan that emits noise highly relevant to the sound detected by the muffler effect detection microphone having a high muffing volume, and mute the sound. Although the configuration is such that the number of rotations of the fan emitting noise that is highly relevant to the sound detected by the muffler effect detection microphone with a small amount is reduced, it may be configured to perform either one of them.

In the fifteenth embodiment, the muffling volume in the muffler effect detection microphones 191 to 193 is used as a parameter for controlling the rotational speed of the fan. However, other parameters may be used as the parameter for controlling the rotational speed of the fan. Of course. For example, the average value of the sound pressure level detected by each of the muffler effect detection microphones 191 to 193 is calculated, and noise that is highly relevant to the sound detected by the muffler effect detection microphone having the largest average value of the sound pressure level is emitted. The number of rotations of the fan may be lowered. Further, for example, the average value of the sound pressure level detected by each of the muffler effect detection microphones 191 to 193 is calculated, and the noise that is highly relevant to the sound detected by the muffler effect detection microphone having the smallest average sound pressure level is radiated. The number of rotations of the fan being used may be increased. Of course, both may be performed.

Further, as parameters for controlling the rotation speed of the fan, the noise detection microphone 161 and the silencing effect detection microphone 191, the noise detection microphone 162 and the silencing effect detection microphone 192, and the coherence values of the noise detection microphone 163 and the silencing effect detection microphone 193 are used. May be. For example, the rotational speed of a fan that emits noise highly relevant to the sound detected by the muffler effect detection microphone having the smallest coherence value may be reduced. Further, for example, the rotational speed of the fan that emits noise highly relevant to the sound detected by the muffler effect detection microphone having the largest coherence value may be increased. Of course, both may be performed.

As described above, in the indoor unit 100 according to the fifteenth embodiment, the plurality of fans 20A to 20C are arranged, and the control device 281 for controlling the rotational speed of the fans 20A to 20C individually (more specifically, the blower fan control means 174). ) Is provided. The blower fan control means 174 increases the rotation speed of the fan that emits noise that is highly relevant to the sound detected by the muffler effect detection microphone having a high mute level among the mute levels of the muffler effect detection microphones 191 to 193. Thus, the rotational speed control is performed so as to reduce the rotational speed of the fan that emits noise having high relevance to the sound detected by the muffler effect detection microphone having a low muffled sound volume. For this reason, the noise reduction effect is further enhanced by increasing the number of rotations in a region where the volume level is low, and the noise in that region is reduced by reducing the number of rotations in a region where the level level is low. For this reason, noise can be further reduced as compared with an indoor unit that uses a single fan with a silencing mechanism having the same configuration, or an indoor unit that does not perform individual fan control.

Further, in the indoor unit 100 according to the fifteenth embodiment, since the fan that emits noise that is highly relevant to the sound detected by the muffler effect detection microphone having a high muffled volume is specified, the emitted sound is Even when a plurality of fans 20A to 20C having different pressure levels are used, the rotational speed can be accurately controlled.

Further, the blower fan control means 174 controls the rotational speed of each of the fans 20A to 20C so that the amount of air radiated from the blowout port 3 is the same when the same rotational speed control is performed as when the individual fan control is performed. Therefore, noise can be reduced without deteriorating the aerodynamic performance.

partition plates

90 and 90a, the air passage is brought closer to the duct structure, so that noise can be captured in one dimension. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced, so that a higher noise reduction effect can be obtained compared to the configuration of FIG. . On the other hand, when there is a region where the silencing mechanism is not provided, by reducing the rotational speed of the fan not equipped with the silencing mechanism, the noise in that region is reduced, and a silencing effect can be obtained similarly.

Embodiment 16 FIG.
The individual fan control shown in the fifteenth embodiment (the individual fan control using information on the fan 20 that is highly relevant to the muffler effect detection microphone) is an air conditioner equipped with a silencing mechanism different from the silencing mechanism according to the fifteenth embodiment. It can also be implemented in the machine. Hereinafter, the case where the individual fan control shown in the fifteenth embodiment is adopted in the indoor unit according to the twelfth embodiment will be described. In the sixteenth embodiment, differences from the above-described eighth to fifteenth embodiments will be mainly described, and the same parts as those in the eighth to fifteenth embodiments are denoted by the same reference numerals. is doing.

FIG. 57 is a front view showing an indoor unit according to Embodiment 16 of the present invention.
The difference between the indoor unit 100 according to the sixteenth embodiment and the indoor unit 100 according to the twelfth embodiment is only the configuration of the blower fan control means 174. The structure of the blower fan control means 174 is exactly the same as the structure shown in FIG. 55 of the fifteenth embodiment.

Next, the operation of the indoor unit 100 will be described.
As in the twelfth embodiment, when the indoor unit 100 operates, the impellers of the fans 20A to 20C rotate, the indoor air is sucked from the upper side of the fans 20A to 20C, and the air is sent to the lower side of the fans 20A to 20C. Airflow is generated. Along with this, a driving sound (noise) is generated in the vicinity of the air outlets of the fans 20A to 20C, and the sound propagates downstream. The air sent by the fans 20A to 20C passes through the air path and is sent to the heat exchanger 50. For example, in the case of cooling operation, low-temperature refrigerant is sent to the heat exchanger 50 from a pipe connected to an outdoor unit (not shown). The air sent to the heat exchanger 50 is cooled by the refrigerant flowing through the heat exchanger 50 to become cold air, and is directly discharged into the room from the outlet 3.

Also, the operation of the silencer mechanisms D to F is exactly the same as in the twelfth embodiment, and a control sound is output so that the noise detected by the noise / silence effect detection microphones 211 to 213 approaches zero, and as a result, the noise The noise reduction effect detection microphones 211 to 213 operate to suppress noise.

In the indoor unit 100 according to the sixteenth embodiment, in addition to the noise from the fan 20B, the noise (crosstalk noise component) radiated from the

adjacent fans

20A and 20C is also included in the noise / silencing effect detection microphone 213. Come in. On the other hand, the crosstalk noise component detected by the noise / silence

effect detection microphones

211 and 212 is smaller than the crosstalk noise component detected by the noise / silence effect detection microphone 213. This is because the noise / silencing

effect detection microphones

211 and 212 have only one adjacent fan (fan 20B). For this reason, the silencing effect of the silencing mechanisms D and E is higher than that of the silencing mechanism F.

The fan individual control of the fans 20A to 20C is almost the same as the contents described in the fifteenth embodiment. The individual fan control of the sixteenth embodiment is different from the individual fan described in the fifteenth embodiment in that the sounds detected by the noise / silence effect detecting microphones 211 to 213 in S1 to S3 input to the muffling volume calculation means 138 are as follows. This is a digital value of the pressure level. Also, the individual fan control of the sixteenth embodiment differs from the individual fan control described in the fifteenth embodiment, in that the fan information stored in the memory 132 is detected by the noise / silence effect detection microphones 211 to 213. This is the identification number of the fan 20 that emits the noise most relevant to the generated sound.

For this reason, the fan individual control rotation speed determination means 134C of the blower fan control means 174 is based on the silence volume calculated by the silence volume calculation means 138 and the blower fan information stored in the memory 132. Increase the fan speed, which is highly related to the sound detected by the mute effect detection microphone, and decrease the fan speed, which is highly related to the sound detected by the noise / silence effect detection microphone, which has a low mute level. Determine the fan speed. At this time, the rotation speeds of the fans 20A to 20C may be determined so that the air volume obtained in the individual fan control is the same as that in the same rotation speed control.

For example, in the indoor unit 100 according to the sixteenth embodiment, the fan 20A is the fan that emits the noise most closely related to the sound detected by the noise / silence effect detection microphone 211, and the noise / silence effect detection microphone. The fan radiating the noise most closely related to the sound detected at 212 is the fan 20C, and the fan radiating the noise most relevant to the sound detected by the noise / silencing effect detection microphone 213 is the fan. Suppose that it was 20B. It is assumed that the noise reduction level in the noise / silence effect detection microphone 211 is −5 dB, the noise reduction level in the noise / silence effect detection microphone 212 is −5 dB, and the noise reduction level in the noise / silence effect detection microphone 213 is −2 dB. In this case, the fan individual control rotation speed determination means 134C determines the rotation speed of each fan so as to increase the rotation speed of the

fans

20A and 20C and decrease the rotation speed of the fan 20B. Since the air volume and the rotational speed are in a proportional relationship, for example, in the case of the configuration shown in FIG. 57, if the rotational speed of the fan 20A and the fan 20C is increased by 10%, the rotational speed of the fan 20B is decreased by 20%. It becomes.

Note that the above-described method for determining the rotational speed of the fans 20A to 20C is merely an example. In the indoor unit 100 according to the sixteenth embodiment, the fan 20A that radiates the noise most closely related to the sound detected by the noise / silence effect detection microphone 211 is the fan 20A, and the noise / silence effect detection microphone 212 is the fan. The fan radiating noise most relevant to the detected sound is the fan 20C, and the fan radiating noise most relevant to the sound detected by the noise / muffling effect detection microphone 213 is the fan 20B. Suppose there was. It is assumed that the noise reduction level in the noise / silence effect detection microphone 211 is −5 dB, the noise reduction level in the noise / silence effect detection microphone 212 is −3 dB, and the noise reduction level in the noise / silence effect detection microphone 213 is −2 dB. In this case, the rotational speed of each fan may be determined such that the rotational speed of the fan 20A is increased, the rotational speed of the fan 20B is decreased, and the rotational speed of the fan 20C is left as it is. That is, the rotation speed of the fan 20A having high relevance to the muffler effect detection microphone 191 having the highest muffle volume is increased, and the rotation speed of the fan 20B having high relevance to the muffler effect detection microphone 193 having the lowest muffle volume is decreased. The rotation speed of each fan may be determined so that the rotation speed of the fan 20C which is neither of them is left as it is.

As described above, in the case of the indoor unit 100 according to the sixteenth embodiment, the noise / noise reduction effect detection microphone 213 is compared with the noise / silence effect detection microphone 213 due to the magnitude of the crosstalk noise component from the adjacent fan. In the area near the silencing

effect detection microphones

211 and 212, the silencing volume increases. On the other hand, in the area near the noise / silencing effect detection microphone 213, the silencing volume is small. Therefore, in the indoor unit 100 according to the sixteenth embodiment provided with a plurality of fans 20A to 20C, the

fans

20A and 20C that radiate noise highly relevant to the muffler

effect detection microphones

191 and 192 having a large muffled sound volume. , And the rotation speed of the fan 20B that emits highly relevant noise to the muffler effect detection microphone 193 with a low muffled sound volume is lowered.

As a result, the indoor unit 100 according to the sixteenth embodiment has a higher silencing effect in a region where the silencing effect is high, and noise is small in a region where the silencing effect is low. Therefore, the indoor unit or fan using a single fan Compared with an indoor unit that does not perform individual control, noise radiated from the entire outlet 3 can be reduced. Furthermore, the indoor unit 100 according to the sixteenth embodiment has aerodynamic performance degradation by individually controlling the rotational speeds of the plurality of fans 20A to 20C so that the airflow is constant when the rotational speed control is performed. Can be suppressed.

Furthermore, in the indoor unit 100 according to the sixteenth embodiment as well, as with the indoor unit 100 shown in FIGS. 51 and 52 of the twelfth embodiment, the air path of the indoor unit 100 is divided into a plurality of regions. Further, the silencing effect can be further improved.

partition plates

90 and 90a, the noise radiated from the fans 20A to 20C can be separated into the respective regions, and the silencing mechanism D is used in the fan 20A. Only the noise radiated from the fan 20C is reduced, the silencing mechanism E reduces only the noise radiated from the fan 20C, and the silencing mechanism F reduces only the noise radiated from the fan 20B. For this reason, the crosstalk noise component (noise radiated from the fan provided in the adjacent flow path) detected by the noise / silencing effect detection microphones 211 to 213 is reduced.

Furthermore, noise can be captured in one dimension because the air path is closer to the duct structure. For this reason, the phase of the noise transmitted through the interior of the indoor unit 100 becomes uniform, and the phase error when the control sound interferes is reduced, so that the silencing effect is further enhanced. Therefore, also in the indoor unit 100 according to the sixteenth embodiment, by dividing the air path of the indoor unit 100 into a plurality of regions, noise can be further reduced compared to the configuration of FIG. On the other hand, when there is a fan that is not provided with a silencing mechanism, noise in an area where the silencing mechanism is not provided is reduced by lowering the rotation speed of the fan 20, and the same effect can be obtained. 51 and 52, the partition plate is inserted in the entire air path. However, a part of the air path is formed by the partition plate, for example, only on the upstream side of the heat exchanger 50 or only on the downstream side of the heat exchanger 50. You may make it delimit.

In the sixteenth embodiment, the noise / silencing effect detection microphones 211 to 213 are installed on the downstream side of the control speakers 181 to 183, but the noise / silence effect detection microphones 211 to 213 are installed on the upstream side of the control speakers 181 to 183. May be installed. Furthermore, in the sixteenth embodiment, three control speakers, noise / muffling effect detection microphones, and three signal processing devices are arranged, but the present invention is not limited to this.

In the sixteenth embodiment, the blower fan control means 174 is configured by the CPU 131 in the control device 281, but is configured by hardware such as LSI (Large Scale Integration) or FPGA (Field Programmable Gate Array). Also good. Further, the configuration of the blower fan control means 174 is not limited to the configuration shown in FIG.

Further, in the sixteenth embodiment, the blower fan control means 174 increases the rotation speed of the fan that emits noise highly relevant to the sound detected by the muffler effect detection microphone having a high muffing volume, and mute the sound. Although the configuration is such that the number of rotations of the fan that emits noise that is highly relevant to the sound detected by the microphone and the noise detected by the microphone is low, it may be configured to perform either one of them. .

In the sixteenth embodiment, the noise reduction level in the noise / silencing effect detection microphones 211 to 213 is used as a parameter for controlling the rotational speed of the fan, but other parameters are used as parameters for controlling the rotational speed of the fan. Of course. For example, the average value of the sound pressure level detected by each of the noise / silence effect detection microphones 211 to 213 is calculated, and is highly relevant to the sound detected by the noise / silence effect detection microphone having the largest average sound pressure level. The rotational speed of the fan that emits noise may be lowered. In addition, for example, the average value of the sound pressure level detected by each of the noise / silence effect detection microphones 211 to 213 is calculated, and the average value of the sound pressure level is related to the sound detected by the noise / silence effect detection microphone. The rotational speed of the fan emitting high noise may be increased. Of course, both may be performed.

As described above, in the indoor unit 100 according to the sixteenth embodiment, the plurality of fans 20A to 20C are arranged, and the control device 281 (more specifically, the blower fan control means 174) that individually controls the rotational speed of the fans 20A to 20C. ) Is provided. The blower fan control means 174 rotates the fan that emits noise that is highly relevant to the sound detected by the noise / silencing effect detection microphone having a high silencing level among the noise reduction levels of the noise / silencing effect detection microphones 211 to 213. The number of revolutions is controlled to be high, and the number of revolutions of the fan that emits noise that is highly relevant to the sound detected by the noise / noise-reduction effect detection microphone with low muffled sound volume is reduced. For this reason, the silencing effect is further enhanced in a region where the volume level is high, and noise is reduced in a region where the volume level is small. For this reason, noise can be further reduced as compared with an indoor unit that uses a single fan with a silencing mechanism having the same configuration, or an indoor unit that does not perform individual fan control.

Further, in the indoor unit 100 according to the sixteenth embodiment, since the fan that emits noise that is highly relevant to the sound detected by the noise / noise-reduction effect detection microphone having a high noise reduction level is identified, the fan is radiated. Even when a plurality of fans 20A to 20C having different sound pressure levels are used, the rotational speed can be accurately controlled.

partition plates

Furthermore, in the sixteenth embodiment, since the noise detection microphones 161 to 163 and the silencing effect detection microphones 191 to 193 are integrated into the noise / silencing effect detection microphones 211 to 213, the number of microphones can be reduced and the number of parts can be reduced. Can be further reduced.

1 casing, 1b back surface, 2 inlet, 3 outlet, 5 bell mouth, 5a upper part, 5b central part, 5c lower part, 6 nozzle, 10 filter, 15 finger guard, 16 motor stay, 17 fixing member, 18 supporting member 20 (20A to 20C) fan, 20a rotating shaft, 21 boss, 25 impeller, 30 fan motor, 50 heat exchanger, 50a symmetry line, 51 front side heat exchanger, 55 back side heat exchanger, 56 fins, 57 heat transfer tube, 58 heat exchanger fixing bracket, 70 upper and lower vanes, 90 partition plate, 90a partition plate, 100 indoor unit, 110 front side drain pan, 111 drainage channel, 111a tongue, 115 back side drain pan, 116 connection port, 117 Drain hose, 121 multiplier, 122 adder, 1 3 delay element, 124 multiplier, 130 input unit, 131 CPU, 132 memory, 133 same rotation speed determination means, 134 (134A, 134B, 134C) fan individual control rotation speed determination means, 135 SW, 136 averaging means, 137 Coherence calculation means, 138 mute volume calculation means, 139 pre-control sound pressure level storage means, 140 differencer, 151 microphone amplifier, 152 A / D converter, 153 weighting means, 154 D / A converter, 155 amplifier, 158, 160 FIR filter, 159 LMS algorithm, 161 to 163, noise detection microphone, 171 to 174, blower fan control means, 181 to 183 control speaker, 191 to 193, silencing effect detection microphone, 201 to 208, signal processing device, 211 213 noise and silencing effect detection microphone, 270 wall member 280 remote 281 control unit, 282A ~ 282C motor driver.

Claims

A casing in which a suction port is formed in the upper part and a blower outlet is formed in the lower part of the front part,
A plurality of blower fans provided in parallel on the downstream side of the suction port in the casing;
A heat exchanger that is provided on the downstream side of the fan in the casing and upstream of the outlet, and exchanges heat between the air blown out of the fan and the refrigerant;
A noise detection device for detecting noise radiated from the fan;
A control sound output device for outputting a control sound for reducing the noise;
A mute effect detecting device for detecting a mute effect by the control sound;
A control sound generation device that outputs the control sound to the control sound output device based on detection results of the noise detection device and the silencing effect detection device;
A controller that individually controls the rotational speed of the plurality of fans, and an air conditioner comprising:
The said control apparatus controls the rotation speed of the said some fan based on the silencing effect when the said control sound is made to interfere with the noise radiated | emitted from the said fan, The air conditioner characterized by the above-mentioned.
The control device changes the number of rotations of the fan based on the silencing effect detected by the silencing effect detecting device, according to the relationship between the sound detected by the silencing effect detecting device and the fan. The air conditioner according to claim 1.
The control device includes a rotational speed control for increasing the rotational speed of the fan that emits noise having the highest relevance to the sound detected by the noise reduction effect detection device having a large detected noise reduction effect, and the noise reduction effect. 3. The rotational speed control of at least one of the rotational speed controls for reducing the rotational speed of the fan that emits noise having the least relevance to the sound detected by the detection device. Air conditioner as described in.
The control device performs a rotational speed control for reducing a rotational speed of the fan that emits noise having the highest relevance to the sound detected by the silencing effect detection device having a small detected silencing effect. The air conditioner according to claim 2 or 3.
A plurality of the silencing effect detection devices, wherein the control device detects sound detected by the silencing effect detection device having the smallest detected sound pressure level based on the sound pressure levels detected by the plurality of silencing effect detection devices; Rotational speed control that increases the rotational speed of the fan that emits the most relevant noise, and the sound that is most relevant to the sound detected by the silencing effect detection device with the highest detected sound pressure level The air conditioner according to claim 2, wherein at least one of the rotational speed controls for reducing the rotational speed of the fan that emits noise is controlled.
Comprising a plurality of the noise detection devices and the silencing effect detection device,
The control device calculates a coherence value between the detection value of the noise detection device and the detection value of the silencing effect detection device, and is most relevant to the sound detected by the silencing effect detection device having the largest coherence value. Rotational speed control for increasing the rotational speed of the fan that radiates high noise, and the fan that radiates the noise most closely related to the sound detected by the muffler effect detection device having the smallest coherence value The air conditioner according to claim 2, wherein at least one of the rotational speed controls for lowering the rotational speed is controlled.
The control device includes a memory that stores the fan that is close to the silencing effect detection device, and a rotational speed control that increases the rotational speed of the fan that is close to the silencing effect detection device stored in the memory; And at least one of the rotational speed controls for lowering the rotational speeds of the fans other than the fan that is close to the silencing effect detection device stored in the memory. Or the air conditioner of Claim 2.
The control device includes a memory for storing the fan close to the silencing effect detection device, and a rotational speed control for reducing the rotational speed of the fan close to the silencing effect detection device having a high detected sound pressure level. And at least one of the rotational speed controls for increasing the rotational speed of the fan that is close to the silencing effect detecting device having a low detected sound pressure level. Item 3. An air conditioner according to Item 2.
The control device includes a memory that stores the fan that is close to the silencing effect detection device, calculates a coherence value between the detection value of the noise detection device and the detection value of the silencing effect detection device, and the coherence value is A rotation speed control for decreasing the rotation speed of the fan close to the low silencing effect detection apparatus, and a rotation speed control for increasing the rotation speed of the fan close to the silencing effect detection apparatus having a high coherence value. The air conditioner according to claim 1 or 2, wherein at least one rotation speed control is performed.
The air conditioner according to any one of claims 1 to 9, wherein the casing is divided into a plurality of regions by a partition plate.
When the control device individually controls the rotational speed of the plurality of fans, the control device reduces the rotational speed of the fan provided in the region where the muffler effect detection device is not provided among the plurality of regions. The air conditioner according to claim 10, wherein the rotational speed control is performed.
When the control device individually controls the rotational speed of the plurality of fans, the control device increases the rotational speed of the fan provided in the region where the silencing effect detecting device is provided among the plurality of regions. The air conditioner according to claim 10 or 11, wherein the rotational speed control is performed.
The control device individually controls the rotational speeds of the plurality of fans so that the airflow is equal to the airflow before the rotational speed control is performed when the rotational speed is individually controlled for the plurality of fans. The air conditioner according to any one of claims 1 to 12, wherein:
A casing in which a suction port is formed in the upper part and a blower outlet is formed in the lower part of the front part,
A plurality of blower fans provided in parallel on the downstream side of the suction port in the casing;
A heat exchanger that is provided on the downstream side of the fan in the casing and upstream of the outlet, and exchanges heat between the air blown out of the fan and the refrigerant;
A control sound output device for outputting a control sound for reducing noise radiated from the fan;
A noise / muffling effect detection device for detecting the noise and detecting a silencing effect of the control sound;
Based on the detection result of the noise / muffling effect detection device, a control sound generation device that causes the control sound output device to output the control sound;
A control device that individually controls the rotational speed of the plurality of fans;
An air conditioner equipped with
The said control apparatus controls the rotation speed of the said some fan based on the silencing effect when the said control sound is made to interfere with the noise radiated | emitted from the said fan, The air conditioner characterized by the above-mentioned.
The control device changes the rotational speed of the fan based on the relationship between the sound detected by the noise / silencing effect detection device and the fan based on the silencing effect detected by the noise / silencing effect detection device. The air conditioner according to claim 14, wherein the air conditioner is used.
The control device has a rotational speed control for increasing the rotational speed of the fan that emits noise having the highest relevance to the sound detected by the noise / silencing effect detection device having a large detected silencing effect, and Performing at least one rotational speed control among rotational speed controls for reducing the rotational speed of the fan that emits noise having the least relevance to the sound detected by the noise / silencing effect detecting device. The air conditioner according to claim 15.
The control device performs rotational speed control for reducing the rotational speed of the fan that emits noise having the highest relevance to the sound detected by the noise / silencing effect detection device having a small detected silencing effect. The air conditioner of Claim 15 or Claim 16 characterized by these.
A plurality of the noise / silencing effect detection devices, wherein the control device is based on the sound pressure level detected by the plurality of noise / silence effect detection devices, and has the smallest detected sound pressure level. Rotation speed control for increasing the rotation speed of the fan that radiates the noise most closely related to the sound detected by the sound, and the noise / silence effect detecting device having the highest detected sound pressure level. 16. The air conditioner according to claim 15, wherein at least one of the rotational speed controls for reducing the rotational speed of the fan that emits the noise most closely related to the noise is performed. .
The control device includes a memory for storing the fan that is close to the noise / silence effect detection device, and increases the rotational speed of the fan that is close to the noise / silence effect detection device stored in the memory. Performing at least one rotational speed control among rotational speed control and rotational speed control for lowering the rotational speed of the fans other than the fan that is close to the noise / silencing effect detection device stored in the memory. The air conditioner according to claim 14 or 15, wherein the air conditioner is characterized.
The control device includes a memory for storing the fan that is close to the noise / silence effect detection device, and reduces the rotational speed of the fan that is close to the noise / silence effect detection device having a high detected sound pressure level. At least one of the rotational speed control and the rotational speed control for increasing the rotational speed of the fan that is close to the noise / silence effect detecting device having a low detected sound pressure level. The air conditioner according to claim 14 or 15.
The air conditioner according to any one of claims 14 to 20, wherein the inside of the casing is divided into a plurality of regions by a partition plate.
When the control device individually controls the number of rotations of the plurality of fans, the number of rotations of the fan provided in the region where the noise / silence effect detection device is not provided among the plurality of regions. The air conditioner according to claim 21, wherein the number of revolutions is controlled so as to lower the value.
When the control device individually controls the number of rotations of the plurality of fans, the number of rotations of the fan provided in the region where the noise / silence effect detection device is provided among the plurality of regions. The air conditioner according to claim 21 or 22, wherein the rotation speed control for increasing the frequency is performed.
The control device individually controls the rotational speeds of the plurality of fans so that the airflow is equal to the airflow before the rotational speed control is performed when the rotational speed is individually controlled for the plurality of fans. The air conditioner according to any one of claims 14 to 23, wherein:
A casing in which a suction port is formed in the upper part and a blower outlet is formed in the lower part of the front part,
A plurality of blower fans provided in parallel on the downstream side of the suction port in the casing;
A heat exchanger that is provided on the downstream side of the fan in the casing and upstream of the outlet, and exchanges heat between the air blown out of the fan and the refrigerant;
A noise detection device for detecting noise radiated from the fan;
A control sound output device for outputting a control sound for reducing the noise;
A mute effect detecting device for detecting a mute effect by the control sound;
A control sound generation device that outputs the control sound to the control sound output device based on detection results of the noise detection device and the silencing effect detection device;
A control device that individually controls the rotational speed of the plurality of fans,
The control device includes a rotational speed control for increasing the rotational speed of the fan disposed at both ends of the casing, and a rotational speed control for decreasing the rotational speed of the fans other than the fan disposed at both ends of the casing. An air conditioner characterized by performing rotation speed control of at least one of them.
The air conditioner according to claim 25, wherein the inside of the casing is divided into a plurality of regions by a partition plate.
When the control device individually controls the rotational speed of the plurality of fans, the control device reduces the rotational speed of the fan provided in the region where the muffler effect detection device is not provided among the plurality of regions. 27. The air conditioner according to claim 26, wherein the rotational speed control is performed.
When the control device individually controls the rotational speed of the plurality of fans, the control device increases the rotational speed of the fan provided in the region where the silencing effect detecting device is provided among the plurality of regions. The air conditioner according to claim 26 or 27, wherein the rotational speed control is performed.
The control device individually controls the rotational speeds of the plurality of fans so that the airflow is equal to the airflow before the rotational speed control is performed when the rotational speed is individually controlled for the plurality of fans. The air conditioner according to any one of claims 25 to 28, wherein:
A casing in which a suction port is formed in the upper part and a blower outlet is formed in the lower part of the front part,
A plurality of blower fans provided in parallel on the downstream side of the suction port in the casing;
A heat exchanger that is provided on the downstream side of the fan in the casing and upstream of the outlet, and exchanges heat between the air blown out of the fan and the refrigerant;
A control sound output device for outputting a control sound for reducing noise radiated from the fan;
A noise / muffling effect detection device for detecting the noise and detecting a silencing effect of the control sound;
Based on the detection result of the noise / muffling effect detection device, a control sound generation device that outputs the control sound to the control sound output device;
A control device that individually controls the rotational speed of the plurality of fans;
The control device comprises:
At least one of a rotational speed control for increasing the rotational speed of the fan disposed at both ends of the casing and a rotational speed control for decreasing the rotational speed of the fans other than the fan disposed at both ends of the casing. An air conditioner characterized by performing rotation speed control.
The air conditioner according to claim 30, wherein the casing is divided into a plurality of regions by a partition plate.
When the control device individually controls the number of rotations of the plurality of fans, the number of rotations of the fan provided in the region where the noise / silence effect detection device is not provided among the plurality of regions. 32. The air conditioner according to claim 31, wherein the rotational speed control is performed to lower the value.
When the control device individually controls the number of rotations of the plurality of fans, the number of rotations of the fan provided in the region where the noise / silence effect detection device is provided among the plurality of regions. The air conditioner according to claim 31 or claim 32, wherein the rotation speed control for increasing the frequency is performed.
The control device individually controls the rotational speeds of the plurality of fans so that the airflow is equal to the airflow before the rotational speed control is performed when the rotational speed is individually controlled for the plurality of fans. The air conditioner according to any one of claims 30 to 33, wherein: