JPH09184499A - Cross-flow fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely reduce noise at an arbitrary position by providing a control means for outputting a control sound signal to a speaker in order to radiating predetermined control sound against sound caused by rotation of a fan body. SOLUTION: An air-conditioning device 10 incorporates a plurality of microphones 30, and two speakers 40. The plurality of microphones 30 include two reference microphones 31 and the remaining number of monitor microphones 32. Further, the speakers 40 are provided to at least one plate 23. Provided is a control means 50 with outputs a control sound signal to the speakers 40 so as to radiate predetermined control sound against sound generated by rotation of a fan 20. With this arrangement, it is possible to reduce noise at an arbitrary position distant from the fan 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross flow fan, and more particularly to noise reduction measures.

[0002]

2. Description of the Related Art Conventionally, some cross flow fans are provided in a casing of an air conditioner. In this cross-flow fan, abnormal noise (hereinafter referred to as NZ sound) generated at the frequency of the product of the number of revolutions (N) and the number of blades (Z) due to interference with the flow-through vortex or tongue during rotation, and pressure. There has been a problem that various noises such as broadband noise generated due to fluctuations are generated.

As a reducing device for actively reducing this noise, as disclosed in JP-A-63-140897, a flat speaker is provided in an air passage, and JP-A-6-43884 is disclosed. As disclosed, one provided with speakers on both side walls of the air outlet, or JP-A-7-
As disclosed in Japanese Patent No. 295788, there is a speaker provided on the end face of the tongue.

Specifically, for example, as shown in FIG.
The heat exchanger (b) is provided in the casing (a), and the cross flow fan (d) is provided close to the air outlet (c).
While the microphone (f) is attached to the tongue (e).
The flat speaker (h) is provided on the lower surface of the air passage (g) below the tongue (e). And
An inverted sound having a phase opposite to that of the noise detected by the microphone (f) is emitted from the speaker (h) to reduce the noise.

[0005]

In the above-described cross flow fan, the speaker is provided in the air passage, the side wall, or the tongue, so that there is a problem that the noise reducing effect is small.

That is, the noise generated from the cross flow fan is a dipole sound source and has directivity, while this noise is generated from the entire circumference of the fan body (22). On the other hand, when the speaker is installed in the air passage as in the conventional case, the noise reduction effect at the specific position can be obtained because the speaker is located away from the crossflow fan, but at any other position. However, there was a problem that the noise reduction effect could not be obtained.

The present invention has been made in view of the above points, and an object thereof is to reliably realize noise reduction at an arbitrary position.

[0008]

[Means for Solving the Problems]

-Summary of the Invention-The present invention is to provide a speaker on the plate of the fan body (22) so as to radiate an inverted sound of an abnormal sound from the vicinity of the sound source, and reduce or mask the abnormal sound. Is.

-Specific items of invention- Specifically, the means taken by the invention according to claim 1 is as follows.
A plurality of fan units (21, 21, ...) Are continuously arranged in the rotation axis direction to form a fan body (22). Further, the fan unit (21, 21, ...) is composed of a plurality of blades (24, 24, ...) Arranged in the circumferential direction extending from the plate (23) orthogonal to the rotation axis in the rotation axis direction. At the same time, the plate (23) is arranged on both sides of the fan body (22), and the fan body (22) is installed in the air passage (1A) and is assumed to be a crossflow fan that conveys air. A speaker (40) provided on at least one plate (23) is provided. In addition, a control means (50) for outputting a control sound signal to the speaker (40) so that the speaker (40) emits a predetermined control sound with respect to the sound generated by the rotation of the fan body (22). It is provided.

Further, the means taken by the invention according to claim 2 is, as shown in FIG. 9, the position of the blades (24, 24, ...) Of the fan body (22) in the invention according to claim 1 above. The position detecting means (60) for detecting and outputting the position signal is provided, while the control means (50) controls the speaker (40) of the fan body (22) based on the position signal of the position detecting means (60). A reversed sound signal is output to the speaker (40) so as to emit a reversed sound having a phase opposite to that of the abnormal sound generated by the rotation.

Further, in the invention described in claim 3,
The means taken by the invention according to claim 1 is the position detecting means (6
0) is a rotation angle sensor for electrically or optically detecting the position of the blades (24, 24, ...), and the means devised by the invention according to claim 4 is the position detecting means (60). , Wings (24,2
The vibration wave sensor detects vibration waves corresponding to positions (4, ...).

Further, the means taken by the invention according to claim 5 detects the sound generated by the rotation of the fan body (22) in the invention according to claim 1, as shown in FIGS. 5 and 8. The microphones (30, 30, ...) And the control means (50) generate an inversion signal so that the speaker (40) emits an inversion sound having a phase opposite to the detection sound detected by the microphones (30, 30, ...). It is configured to output to the speaker (40).

Further, the means taken by the invention according to claim 6 is the invention according to claim 5, wherein the microphones (30, 30, ...) Are the reference microphones (31) and the monitor microphones (32, 32 ,. ) And while
The control means (50) outputs a reverse sound signal to the speaker (40) so that the speaker (40) emits a reverse sound having a phase opposite to that of the reference sound detected by the reference microphone (31). 53), the reference sound detected by the reference microphone (31) and the monitor microphone (32, 32, ...).
An adaptive circuit (5) that adaptively controls the reverse sound output circuit (53) so that the reverse sound signal is corrected based on the monitor sound detected by
4) and is provided.

The means of the invention according to claim 7 is the microphone according to claim 5, wherein the microphones (30, 30, ...) Are a plurality of microphones for detecting both the reference sound and the monitor sound. It is composed.

The means taken by the invention according to claim 8 is the control means (50) in the invention according to claim 5 above.
However, among the detection sounds detected by the microphones (30, 30, ...), an inverted sound signal relating to an abnormal sound generated by the rotation of the fan body (22) is output.

Further, in the invention described in claim 1,
The means taken by the invention according to claim 9 is a speaker (40).
11. A pair is provided so as to face two plates (23) provided at both ends of the fan body (22), and
The means taken by the invention according to claim 1 is one plate (23) in which the speaker (40) is provided at one end of the fan body (22).
The means provided by the invention according to claim 11 is provided only for one plate (23) and one speaker (4
0) is provided, and the means implemented by the invention according to claim 12 is such that one plate (23) has a plurality of speakers (4).
0, 40, ...) are provided.

Further, in the invention described in claim 12, in the means implemented by the invention according to claim 13, a plurality of speakers (40, 40, ...) Are arranged along the outer peripheral edge of the plate (23). Further, the means taken by the invention according to claim 13 is that the plurality of speakers (40, 40, ...) Is a plate (23).
Are arranged in a matrix.

The means taken by the invention according to claim 15 is the invention according to any one of claims 9 to 12,
The speaker (40) is a piezoelectric element.

The means taken by the invention according to claim 16 is the control means (50) in the invention according to claim 1 above.
Is a control sound signal to the speaker (40) so that the speaker (40) emits a control sound for masking an abnormal sound generated by the rotation of the fan main body (22) according to the rotation speed of the fan main body (22). It is configured to output.

-Operation- Due to the above-mentioned matters specifying the invention, in the invention according to claim 1,
When the fan body (22) is driven to rotate, for example, indoor air is sucked into the casing, and heat is exchanged with the refrigerant in the heat exchanger to become conditioned air of warm air or cold air, which conditioned air passes through the fan body (22). Is blown out indoors.

Air flows through the fan body (22), but the blades (24, 24, 24,
...) generate NZ sound when passing, or vortex is generated inside the fan body (22), and NZ sound is generated when the blades (24, 24, ...) pass through this vortex. .

On the other hand, the plate (23) of the fan body (22)
The speaker (40) provided in the fan receives the control sound signal from the control means (50) and emits the control sound to the fan body (22). Specifically, in the inventions according to claim 5 and claim 6,
The noise generated by the rotation of the fan body (22) is detected by the reference microphone (31), and the reference microphone (31) outputs the reference sound signal to the inverted sound output circuit (53). The inverted sound output circuit (53) generates and outputs an inverted sound signal having a phase opposite to that of the reference sound. Then, the speaker (40) emits an inverted sound having a phase opposite to that of the reference sound.

Further, the noise is detected by a plurality of monitor microphones (32, 32, ...) And a monitor sound signal is output. Based on the monitor sound signal and the reference sound signal of the reference microphone (31), the noise is adapted. The circuit (54) adaptively controls the inverted sound output circuit (53) so that the error between the reference sound and the monitor sound is reduced. By this adaptive control, the inversion sound output circuit (53) outputs an inversion sound signal corresponding to noise,
The speaker (40) emits a reverse sound adapted to noise to reduce the noise.

In the invention according to claim 15, the speaker (40) comprises the speaker (40), while in the invention according to claim 15,
In the invention according to claim 1, the plates (23, 23) on both sides of the fan body (22) are provided to emit a reversal sound, and in the invention according to claim 10, the plate is provided on one plate (23) and is inverted. In the invention according to claim 11, which emits sound,
It is provided on all plates (23, 23, ...) and emits a reverse sound.

Further, the speaker (40) is characterized in that:
In the invention according to claim 13 and a plurality of them are provided along the outer peripheral edge of the plate (23), and in the invention according to claim 14, the plate (23) is provided in a matrix and emits a reversal sound. .

Further, in the invention according to claim 7, each microphone (30, 30, ...) Detects the reference sound and the monitor sound so that the detection sound of each microphone (30, 30, ..) is reduced. The inverted sound will be emitted from the speaker (40).

In the invention according to claim 2, the position detecting means (60) detects the position of the blades (24, 24, ...) And outputs a position signal. Specifically, the invention according to claim 3 Then, the rotation angle sensor outputs the position signal, and in the invention according to claim 4, the vibration wave sensor outputs the position signal. Then, based on the position signal, the speaker (40) emits a reversal sound having a phase opposite to that of the abnormal sound.

Further, in the sixteenth aspect of the present invention, the control means (50) outputs a control sound signal for masking an abnormal noise generated by the rotation of the fan body (22) to the speaker (40), and the speaker (40). The (40) emits a control sound signal according to the rotation speed of the fan body (22), that is, a peak noise is prevented.

[0029]

Therefore, according to the present invention, since the speaker (40) is provided on the plate (23) of the fan body (22) to emit the control sound, the speaker (40) is provided near the noise source. ) Can be positioned, so noise can be reliably reduced at any position away from the fan body (22).

That is, the noise generated from the fan body (22) is a dipole sound source and has directivity, while this noise is generated from the entire circumference of the fan body (22). On the other hand, since the speaker (40) is arranged near the noise source, the noise reduction effect can be obtained not only at the specific position but also at any other position. In particular, according to the invention of claim 8, since the speaker (40) radiates a reversal sound having a phase opposite to that of the noise, it is possible to reduce annoying NZ sound, so that a comfortable space is surely realized. can do.

The speaker (40) is connected to the plate (2
Since it is provided on almost the entire surface of 3), it is possible to surely reduce not only the noise due to the vortex AV but also various noises.

According to the second aspect of the present invention, the control means (50) receives the position signal of the rotation angle sensor (60) and outputs a reverse sound signal having a phase opposite to the NZ sound of the cross flow fan (20). Is generated and output, and the speaker (40) radiates an inverted sound having a phase opposite to that of the abnormal sound, so that the abnormal sound can be quickly and reliably reduced.

According to the invention of claim 6, the reference microphone (31) and the monitor microphone (32, 3).
2, ...) are provided for adaptive control, various noises can be dealt with, and more reliable noise reduction can be achieved.

According to the invention of claim 7, the plurality of microphones (30, 30, ...) Are respectively the reference microphone (31) and the monitor microphone (32, 32, ...).
Since it has the functions of and, it is possible to omit the reference microphone (31) and reduce noise.
The configuration can be simplified.

According to the ninth aspect of the invention, since the speaker (40) is provided on the plates (23, 23) on both sides, the inverted sound is surely propagated to the entire fan body (22). Therefore, noise can be reduced more reliably.

According to the invention of claim 12, 1
Multiple speakers (40, 40, ...) on one plate (23)
Because of the provision of multiple speakers (40, 40,
..) can output inverted sounds of a plurality of types of frequencies, it is possible to reliably reduce various noises.

According to the fifteenth aspect of the invention, since the speaker (40) is composed of the piezoelectric element, the mounting space can be reduced, which leads to an increase in the size of the fan body (22). It is possible to surely reduce noise.

Further, according to the sixteenth aspect of the present invention, since the abnormal noise is masked, the peak-like abnormal noise is eliminated, and the abnormal noise can be made hard to hear, so that comfort is improved. It is possible to improve.

[0039]

Embodiment 1 of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the wall-mounted air conditioner (10) has a substantially inverted V-shaped heat exchanger (in the air passage (1A) formed in the casing (11). 12) and a cross flow fan (20). In the casing (11), a suction port (13) is formed from the upper part of the front surface to the upper surface, and a blowout port (14) is formed in the lower part of the front surface so that heat is exchanged in the vicinity of the suction port (13). The device (12) has a cross flow fan (20) arranged near the air outlet (14).

Further, inside the casing (11),
A tongue (15) that partitions the inside of the casing (11) into a low-pressure side and a high-pressure side is formed near the crossflow fan (20). Then, when the cross flow fan (20) is rotated, room air is sucked into the casing (11) from the suction port (13) and exchanges heat with the refrigerant in the heat exchanger (12) to produce conditioned air of warm air or cool air. The conditioned air is blown into the room from the outlet (14) through the cross flow fan (20). In addition, in the above-mentioned outlet (14),
A plurality of vertical flaps (16, 16, ...) And two horizontal flaps (17, 17) are provided.

As shown in FIG. 3, the cross flow fan (20) has a fan body (22) composed of a plurality of fan units (21, 21, ...) Which form a so-called series. The fans (21, 21, ...) Are arranged in the direction of the rotation axis. Each fan above (21, 21, ...)
Is composed of a plate (23) orthogonal to the rotation axis direction and a plurality of blades (24, 24, ...) Extending from the plate (23) in the rotation axis direction and arranged in the circumferential direction. .

Plates (23, 23) are arranged on both sides of the fan body (22), and the plurality of blades (24, 24,
...) form a blade row between two adjacent plates (23, 23). Also, the fan body (22)
A rotary shaft (22) is provided on the plates (23, 23) on both sides of, and a motor is connected to the rotary shaft (22) (not shown).

The blades (24, 24) of the above fan alone (21, 21, ...)
24, ...) are arranged, for example, at unequal pitches with different pitches, and have a twisted shape that is twisted about the rotation axis from one side end surface of the blade (24, 24, ...) to the other side end surface. The airfoil formed in the twisted blade and having a cross section orthogonal to the rotation axis is formed to have the same shape with respect to the rotation axis at any cross-section position. In other words, the wings (24, 24,
...) is twisted in a spiral shape around the axis of rotation. The blades (24, 24, ...) In addition to the above-mentioned twisted blades, they may be straight blades parallel to the rotation axis direction or inclined blades that are linearly inclined with respect to the rotation axis center.

-Means for Noise Reduction- On the other hand, when the crossflow fan (20) is rotationally driven, air flows through the crossflow fan (20) as shown by the airflow AF in FIG. , Tongue (1
When the blades (24, 24, ...) pass near 5), NZ sound is generated or vortex AV is generated in the cross flow fan (20).
When the wing (24, 24, ...) Passes through this vortex AV, an NZ sound, which is an abnormal sound, is generated. In addition, broadband noise such as aerodynamic noise is generated due to pressure fluctuations in the air flow AF.

Therefore, as a feature of the present invention, as shown in FIG. 5, a plurality of microphones (30, 30, ...) Are installed in the air conditioner (10) and two speakers (40) are provided. is set up. The plurality of microphones (3
0, 30, ...) is composed of two reference microphones (31) and a plurality of monitor microphones (32, 32, ...).

The reference microphone (31) is attached to the center of the plate (23) arranged on both sides of the fan body (22) so as to detect the noise generated by the rotation of the crossflow fan (20). It is configured. The monitor microphones (32, 32, ...) Have a tongue (15),
It is attached to an air passage wall of the casing on the upstream side of the cross flow fan (20) and an air passage wall of the casing on the downstream side of the cross flow fan (20) close to the air outlet, and surrounds the cross flow fan (20). Is configured to detect noise.

As shown in FIGS. 6 and 7, the speaker (40) is composed of a disk-shaped piezoelectric element, and is attached to plates (23) arranged on both sides of the fan body (22). There is. The pair of speakers (40) are attached to the inner surface of the plate (23) so as to face each other,
Moreover, it is provided almost all over the plate (23).
That is, except for the plates (23) on both sides,
23, ...) are formed in the shape of a donut, the speaker (40) is provided so that the sound emitted from the speaker (40) propagates toward the center of the inside of the fan body (22). Has been. The speaker (40) has a rotating shaft (25).
It is connected to the lead wire (41) through a slip ring provided on the.

The reference microphone (31) and the monitor microphones (32, 32, ...) Are connected to the control means (50), which controls the arithmetic circuit (51) and the amplifier circuit (52). ) And the arithmetic circuit (51) further comprises
The reverse sound output circuit (53) and the adaptation circuit (54) are provided. The inversion sound output circuit (53) is configured to generate and output an inversion sound signal having a phase opposite to that of the reference sound, based on the reference sound detected and output by the reference microphone (31). .

The adaptive circuit (54) includes a reference sound of the reference microphone (31) and a monitor microphone (32, 32,
..), the correction signal is output to the inversion sound output circuit (53) so as to reduce the error.
That is, the adaptive circuit (54) is the reverse sound output circuit (53).
The filter coefficient of is updated so that the error between the reference sound and the monitor sound is reduced, and the inverted sound output circuit (53) is adaptively controlled.

The amplifier circuit (52) receives the inverted sound signal of the inverted sound output circuit (53) and amplifies the speaker (40) so that the speaker (40) emits an inverted sound having a phase opposite to that of the noise. The reverse sound signal is being output.

The inversion sound output circuit (53) may generate an inversion sound signal of the NZ sound so as to reduce only the NZ sound which is an abnormal sound. A reversal sound signal of the noise may be generated so as to reduce the noise including the broadband noise.

-Noise Reduction Operation- Next, the noise reduction operation of the cross flow fan (20) will be described.

When the cross flow fan (20) is driven to rotate, room air is sucked into the casing (11) through the suction port (13) as shown by the air flow AF in FIG. Heat is exchanged with the refrigerant to become conditioned air of warm air or cold air, and this conditioned air passes through the crossflow fan (20) and is blown out into the room through the air outlet (14).

Air flows through the cross flow fan (20) (see air flow AF in FIG. 4), but the blades (24, 24, ...) Pass near the tongue (15). The NZ sound is generated when the vortex AV is generated, or the vortex AV is generated in the cross flow fan (20), and the NZ sound is generated when the blades (24, 24, ...) Pass through the vortex AV.

The noise generated by the rotation of the cross flow fan (20) is detected by the reference microphones (31) provided on the plates (23) on both sides of the fan body (22), and the reference microphones (31) are detected. 31)
Outputs the reference sound signal to the inverted sound output circuit (53). The inverted sound output circuit (53) generates and outputs an inverted sound signal having a phase opposite to that of the reference sound, and the amplification circuit (52) amplifies and outputs the inverted sound signal to the speaker (40). Then, the speaker (4
0) will emit a reversal sound that is in anti-phase with the reference sound,
That is, a reversal sound is radiated from the plates (23) on both sides of the fan body (22), and the reversal sound propagates toward the center of the inside of the fan body (22) and at the same time the cross flow fan (20) It propagates to the surroundings and reduces noise.

Further, the noise around the cross flow fan (20) is caused by a plurality of monitor microphones (32, 32,
...) to output a monitor sound signal, and based on this monitor sound signal and the reference sound signal of the reference microphone (31), the adaptive circuit (54) reduces the error between the reference sound and the monitor sound. The filter coefficient of the inverted sound output circuit (53) is updated. The reversal sound output circuit (53) outputs the reversal sound signal adapted to the noise of the crossflow fan (20) by updating the filter coefficient, and the speaker (40) radiates the reversal sound corresponding to the noise to generate the noise. Reduce.

-Effects of First Embodiment- As described above, according to the first embodiment, the speakers (40) are provided on the plates (23, 23) on both sides of the fan main body (22) to have a phase opposite to that of noise. Since the speaker (40) can be positioned in the vicinity of the noise source because the reversal sound is radiated, noise reduction can be reliably achieved at any position away from the fan body (22).

That is, the noise generated from the fan body (22) is a dipole sound source and has directivity, while this noise is generated from the entire circumference of the fan body (22). On the other hand, since the speaker (40) is arranged near the noise source, the noise reduction effect can be obtained not only at the specific position but also at any other position. Especially N that is jarring
Since the Z sound can be reduced, a comfortable space can be surely realized.

Further, since the speaker (40) is composed of the piezoelectric element, the mounting space can be reduced, so that the noise can be surely reduced without increasing the size of the fan body (22). it can.

Further, since the speaker (40) is provided on the plates (23, 23) on both sides, the inverted sound can be surely propagated to the entire fan body (22), and the noise can be reduced more surely. Can be achieved.

The speaker (40) is connected to the plate (2
Since it is provided on almost the entire surface of 3), it is possible to surely reduce not only the noise due to the vortex AV but also various noises.

Further, since the reference microphone (31) and the monitor microphones (32, 32, ...) Are provided for adaptive control, various noises can be dealt with, and more reliable noise reduction is achieved. be able to.

[0064]

Second Embodiment The second embodiment is an embodiment of the invention according to claim 7, and as shown in FIG. 8, the reference microphone (31) and the monitor microphone (32, 32,…) and two types of microphones (3
0, 30, ...) are provided instead of a plurality of microphones (30, 30, ...) Each being a reference microphone (31).
And a monitor microphone (32, 32, ...).

The plurality of microphones (30, 30, ...)
Is attached to the tongue (15) and the air passage wall of the casing on the downstream side of the cross flow fan (20) close to the air outlet (14), and detects noise around the cross flow fan (20). Is configured.

On the other hand, the inverted sound output circuit (53) in the control means (50) receives the detected sound of each microphone (30, 30, ...) And generates and outputs an inverted sound signal having a phase opposite to the detected sound. Will be done. Further, the adaptive circuit (54) of the control means (50) updates the filter coefficient of the inverted sound output circuit (53) so that the detected sound of each microphone (30, 30, ...) Is reduced.

Therefore, according to the second embodiment, noise can be reduced by omitting the reference microphone (31), so that the structure can be simplified. Other configurations and operational effects are similar to those of the first embodiment.

[0068]

Third Embodiment A third embodiment of the present invention is an embodiment of the invention according to claims 2 and 3, and as shown in FIG. 9, a reference microphone (31) and a monitor of the first embodiment. A rotation angle sensor (60) is provided in place of the microphones (32, 32, ...).

Specifically, the rotation angle sensor (60) is position detecting means (60) for detecting the positions of the blades (24, 24, ...) Of the fan body (22), and the fan body (22) Is configured to detect the rotational position of a motor connected to the rotary shaft of the. That is, the rotation angle sensor (60) electrically detects the rotation of the magnet or the like to derive the rotation position,
It is composed of an electrical or optical sensor such as one that derives a rotational position by an optical sensor or the like.

On the other hand, the arithmetic circuit (51) of the control means (50)
Is configured to receive the position signal of the rotation angle sensor (60) and generate and output a reversal sound signal having a phase opposite to that of the NZ sound which is the abnormal sound of the cross flow fan (20). And
The amplifier circuit (52) amplifies and outputs the inverted sound signal, and the speaker (40) emits an inverted sound having a phase opposite to that of the NZ sound. That is, the NZ sound of the cross flow fan (20) is
4, 24, ...) are generated when the tongue portion (15) passes, and the like, so that the NZ sound can be clarified in advance. Therefore, the arithmetic circuit (51) is configured to output a reversal sound signal having a phase opposite to that of the NZ sound based on the position signal of the rotation angle sensor (60).

Therefore, according to the third embodiment, the control means (50) receives the position signal of the rotation angle sensor (60) and generates an inverted sound signal having a phase opposite to the NZ sound of the cross flow fan (20). Then, the speaker (40) emits an inverted sound having a phase opposite to that of the NZ sound, and the NZ sound is reduced. As a result, the NZ sound can be reduced quickly and reliably. Other configurations and operational effects are similar to those of the first embodiment.

In the third embodiment, the rotation angle sensor (60) is applied as the position detecting means, but the embodiment of claim 4 corresponds to the position of the blade (24, 24, ...). The position detecting means may be configured by a vibration wave sensor that detects a vibration wave. Specifically, pressure fluctuations caused by passage of the blades (24, 24, ...) Are measured by the microphone (30,
30,…) or pressure sensor to detect the wing (24, 24,
The position of () may be derived.

[0073]

Embodiment 4 of the present invention will be described with reference to FIGS.
4 is another embodiment showing how the speaker (40) is attached to the fan body (22).

First, FIG. 10 shows an embodiment of claim 10 in which one speaker (40) is provided on the plate (23) located on one side of the fan body (22). . Therefore, in the present embodiment, the reversal sound radiated from one speaker (40) propagates from one side portion to the other side portion of the fan body (22) to reduce noise.

FIG. 11 shows an embodiment of claim 11 in which one speaker (40) is provided on each of the inner surfaces of all the plates (23, 23, ...) Of the fan main body (22). is there. That is, one fan (21) is provided with one speaker (40). Therefore, in the present embodiment, the reversal sound radiated from each speaker (40) propagates from one side part to the other side part of each fan unit (21, 21, ...) And reduces noise. .

In FIG. 12, one speaker (40) is provided on every other plate (23) of the fan body (22).
Is provided. Specifically, in the cross flow fan (20) of FIG. 12, the left four fan units (21,
21,…) 1 for 2 fans (21, 21)
Two speakers (40) are provided. Therefore, in the present embodiment, the reversal sound radiated from each speaker (40) propagates over the two fan units (21, 21) to reduce noise.

FIG. 13 shows that all the plates (23, 23, ...) Of the fan main body (22) are provided with speakers (40) respectively, and the plates (23, 23, 23,
...) is provided with speakers (40) on both sides. That is, one fan (21) is provided with two speakers (40, 40). Therefore, in the present embodiment, the reversal sound radiated from each speaker (40, 40, ...) From the both side parts of each fan unit (21, 21, ...) To the central part of each fan unit (21, 21 ,. Will be propagated over the course of time and will reduce noise.

FIG. 14 is an embodiment according to claim 12, wherein a plurality of speakers (40) are provided on the plates (23, 23, ...) Of the fan body (22). That is, as in FIG. 13, the plates (23, 23, ...) In the central portion except both sides are provided with the speakers (40) on both sides, and each plate (23, 23 ,. A plurality of speakers (40, 40, ...) Are provided. Therefore, in the present embodiment, the reversal sound radiated from each speaker (40, 40, ...) Extends from both side parts of the fan unit (21, 21, ...) To the center part of the fan unit (21, 21 ,. Propagated,
It will reduce noise. Specifically, as shown in FIG. 15, the reversing sound is radiated from both sides of the wings (24, 24, ...),
The noise will be canceled. In particular, since a plurality of speakers (40, 40, ...) Can output inverted sounds of a plurality of types of frequencies, various noises can be reliably reduced.

[0079]

Fifth Embodiment of the Invention The fifth embodiment is shown in FIGS.
As shown in Fig. 3, the speaker (4
It is another embodiment showing a mounting state of (0).

First, in FIG. 16, one speaker (40) is provided in the central portion of the plate (23). That is, the speaker (40) shown in FIG. 7 of the first embodiment.
Is provided on almost the entire surface of the plate (23), but the speaker (40) of FIG. 16 is provided only on the central portion of the plate (23). Therefore, the speaker (40)
Will emit a reversal sound from the center of the plate (23).

In FIG. 17, one circular speaker (40) is provided on the outer peripheral portion of the plate (23). Therefore, the speaker (40) includes the plate (23).
As a result of the rotation, the circular motion is performed, and the reverse sound is emitted while performing the circular motion.

FIG. 18 shows that the outer peripheral edge of the plate (23) is
Two donut-shaped speakers (40) are provided. Therefore, the speaker (40) emits a reversal sound from the outer peripheral portion of the plate (23).

FIG. 19 shows an embodiment of claim 13 in which a plurality of speakers (40, 40, ...) Are arranged on the donut board along the outer peripheral edge of the plate (23). is there. Therefore, the speaker (40, 40, ...)
Inversion sound is emitted from the outer peripheral portion of the plate (23). In particular, since a plurality of speakers (40, 40, ...) Can output inverted sounds of a plurality of types of frequencies, various noises can be reliably reduced. Moreover, since the inverted sound is emitted from the central portion and the outer peripheral portion of the plate (23), the effect of reducing the NZ sound due to the vortex AV shown in FIG. 4 is exerted.

In FIG. 20, a plurality of circular speakers (40, 40, ...) Are arranged along the outer peripheral edge of the plate (23). Therefore, the speaker (40)
Emits a reversal sound from the outer peripheral portion of the plate (23), like the speakers (40, 40, ...) In FIG. In particular, since multiple speakers (40, 40, ...) Can output inverted sounds of multiple types of frequencies, it is possible to reliably reduce various types of noise and also to reduce NZ sounds. Will be done.

In FIG. 21, a plurality of circular speakers (40, 40, ...) Are arranged at a plurality of locations on the plate (23). Therefore, the speaker (40, 40, ...)
Will emit reversal sound from multiple points on the plate (23). In particular, since multiple speakers (40, 40, ...) Can output inverted sounds of multiple types of frequencies,
Various noises can be surely reduced. Moreover, since the inverted sound is emitted from the central portion and the outer peripheral portion of the plate (23), the NZ sound due to the vortex AV shown in FIG.
The effect of reducing various noises such as NZ sound when passing through the vehicle is exhibited.

FIG. 22 shows an embodiment according to a twenty-second aspect, in which a plurality of speakers (40, 40, ...) Are arranged in a matrix on the plate (23). Therefore, the speaker (40, 40, ...) Is connected to the plate (23).
Inverted sound will be emitted from multiple locations. In particular, like the speakers (40, 40, ...) In FIG. 21, various noises can be reliably reduced, and in addition to the NZ sound due to the vortex AV, the NZ sound due to the tongue (15), etc. The reduction effect will be exhibited.

In FIG. 23, a plurality of speakers (40, 40, ...) Are arranged in a divided manner on the entire surface of the plate (23). Therefore, the speaker (40, 40, ...)
Emits a plurality of types of inversion sounds from almost the entire surface of the plate (23). In particular, the speaker (40, 4 in FIG.
Similarly to 0, ..., It is possible to reliably reduce various noises, and to exert a reducing effect not only on the NZ sound due to the vortex AV but also on the NZ sound due to the tongue (15).

[0088]

Embodiment 6 In Embodiment 6, as shown in FIG. 24, a cone speaker (40) is used in place of the piezoelectric element speaker (40) used in Embodiments 1 to 6. Used. Specifically, storage boxes (27) for the speakers (40) are provided on both sides of the fan body (22) instead of the plates (23). Other configurations and operational effects are similar to those of the first embodiment.

[0089]

Other Embodiments In the first to sixth embodiments, the noise is reduced. However, as an embodiment of claim 16, the noise of the cross flow fan (20) is NZ.
The sound may be masked. That is, the control means (50) controls the NZ generated by the rotation of the fan body (22).
The speaker (40) emits a control sound signal such that noise other than sound is emitted by the speaker (40) according to the rotation speed of the fan body (22).
0) is output. As a result, the peak NZ sound disappears, and the NZ sound is less likely to be heard perceptually, so that the comfort is improved.

In addition, in each of the embodiments, the air conditioner (1
0) has been described, the cross flow fan (20) of the present invention can be applied as various blowers.

[Brief description of the drawings]

FIG. 1 is a front view showing an air conditioner of the present invention.

FIG. 2 is a cross-sectional view showing an air conditioner.

FIG. 3 is a front view showing a cross flow fan.

FIG. 4 is a schematic sectional view of an air conditioner showing an air flow.

FIG. 5 is a schematic cross-sectional perspective view of an air conditioner showing a noise reduction mechanism.

FIG. 6 is a schematic view of a cross flow fan showing a mounting state of a speaker.

FIG. 7 is a partially omitted perspective view showing a main part of a single fan.

FIG. 8 is a schematic cross-sectional perspective view of the air conditioning apparatus showing the noise reduction mechanism of the second embodiment.

FIG. 9 is a schematic cross-sectional perspective view of an air conditioner showing a noise reduction mechanism according to a third embodiment.

FIG. 10 is a schematic front view of a crossflow fan showing a mounting state of another speaker of the fourth embodiment.

FIG. 11 is a schematic front view of a crossflow fan showing a mounting state of another speaker of the fourth embodiment.

FIG. 12 is a schematic front view of a crossflow fan showing a mounting state of another speaker of the fourth embodiment.

FIG. 13 is a schematic front view of a crossflow fan showing a mounting state of another speaker of the fourth embodiment.

FIG. 14 is a schematic front view of a crossflow fan showing a mounting state of another speaker of the fourth embodiment.

15 is a schematic front view showing an operating state of the cross flow fan of FIG.

FIG. 16 is a schematic perspective view of a main part of a fan alone showing another speaker arrangement according to the fifth embodiment.

FIG. 17 is a schematic perspective view of a main part of a fan alone showing an arrangement state of another speaker of the fifth embodiment.

FIG. 18 is a schematic perspective view of a main part of a fan alone showing an arrangement state of another speaker of the fifth embodiment.

FIG. 19 is a schematic perspective view of a main part of a fan alone showing an arrangement state of another speaker of the fifth embodiment.

FIG. 20 is a schematic perspective view of an essential part of a fan showing another arrangement of speakers according to the fifth embodiment.

FIG. 21 is a schematic perspective view of a main part of a fan showing another arrangement of speakers according to the fifth embodiment.

FIG. 22 is a schematic perspective view of an essential part of a fan showing another arrangement of speakers according to the fifth embodiment.

FIG. 23 is a schematic perspective view of a main part of a fan showing another arrangement of speakers according to the fifth embodiment.

FIG. 24 is a schematic front view of a crossflow fan showing a sixth embodiment.

FIG. 25 is a schematic cross-sectional perspective view of an air conditioner showing a conventional noise reduction mechanism.

[Explanation of symbols]

 10 Air conditioner 11 Casing 12 Heat exchanger 13 Inlet 14 Outlet 15 Tongue 20 Cross flow fan 21 Fan alone 22 Fan body 23 Plate 24 Blade 25 Rotating shaft 26 Motor 30 Microphone 31 Reference microphone 32 Monitor microphone 40 Speaker 50 Control Means 51 Arithmetic circuit 52 Amplification circuit 53 Inverted sound output circuit 54 Adaptive circuit 60 Rotation angle sensor (position detection means)

Claims (16)

[Claims] 1. A fan body (22) is configured by arranging a plurality of fan units (21, 21, ...) In succession in a direction of a rotation axis, and the fan units (21, 21, ...) Are rotated. A plurality of blades (24, 24, ...) extending in the direction of the rotation axis from a plate (23) orthogonal to the axis are arranged in the circumferential direction, and at the same time,
In the cross-flow fan in which the plates (23) are arranged on both sides of the fan body (22) and the fan body (22) is installed in the air passage (1A) to convey air, at least one plate (23) is provided. A speaker (40) provided, and outputs a control sound signal to the speaker (40) so that the speaker (40) emits a predetermined control sound with respect to the sound generated by the rotation of the fan body (22). A cross-flow fan comprising: a control means (50). 2. The cross flow fan according to claim 1, further comprising position detecting means (60) for detecting the position of the blades (24, 24, ...) Of the fan body (22) and outputting a position signal. The control means (50), based on the position signal of the position detection means (60), causes the speaker (40) to emit a reversal sound of opposite phase to that of the abnormal sound generated by the rotation of the fan body (22). A crossflow fan that outputs a signal to a speaker (40). 3. The cross flow fan according to claim 2, wherein the position detecting means (60) is a rotation angle sensor for electrically or optically detecting the positions of the blades (24, 24, ...). And cross flow fan. 4. The cross flow fan according to claim 2, wherein the position detecting means (60) is a vibration wave sensor for detecting a vibration wave corresponding to the position of the blades (24, 24, ...). A cross flow fan. 5. The crossflow fan according to claim 1, wherein the microphone (30, 30, ...) For detecting the sound generated by the rotation of the fan body (22) and the control means (50) are the microphone (30, 30). A cross-flow fan, which outputs a reversed sound signal to the speaker (40) so that the speaker (40) emits a reversed sound having a phase opposite to that of the detected sound detected by (30, ...). 6. The cross flow fan according to claim 5, wherein the microphone (30, 30, ...) Is composed of a reference microphone (31) and a monitor microphone (32, 32, .. And 50) a reverse sound output circuit (53) for outputting a reverse sound signal to the speaker (40) so that the speaker (40) emits a reverse sound having a phase opposite to that of the reference sound detected by the reference microphone (31). , The reference sound detected by the reference microphone (31) and the monitor microphone (32, 32, ...)
An adaptive circuit (5) that adaptively controls the reverse sound output circuit (53) so that the reverse sound signal is corrected based on the monitor sound detected by
4) A cross flow fan characterized by having and. 7. The crossflow fan according to claim 5, wherein the microphones (30, 30, ...) Are composed of a plurality of microphones that detect both a reference sound and a monitor sound. fan. 8. The cross-flow fan according to claim 5, wherein the control means (50) reverses an abnormal sound generated by the rotation of the fan body (22) among the detection sounds detected by the microphones (30, 30, ...). A cross-flow fan that outputs a sound signal. 9. The cross flow fan according to claim 1, wherein the speaker (40) is provided in a pair so as to face two plates (23) provided at both ends of the fan body (22). Characteristic cross flow fan. 10. The cross flow fan according to claim 1, wherein the speaker (40) is provided only on one plate (23) provided at one end of the fan body (22). A cross flow fan. 11. The cross flow fan according to claim 1, wherein one plate (23) is provided with one speaker (40). 12. The cross flow fan according to claim 1, wherein one plate (23) has a plurality of speakers (40, 40,
...) is provided, a cross flow fan. 13. The cross flow fan according to claim 12, wherein the plurality of speakers (40, 40, ...) Are arranged along the outer peripheral edge of the plate (23). 14. The cross flow fan according to claim 12, wherein the plurality of speakers (40, 40, ...) Are arranged in a matrix on the plate (23). 15. The crossflow fan according to any one of claims 9 to 12, wherein the speaker (40) is a piezoelectric element. 16. The cross flow fan according to claim 1, wherein the control means (50) outputs a control sound for masking an abnormal sound generated by the rotation of the fan body (22) to the speaker (40).
A cross flow fan, wherein a control sound signal is output to a speaker (40) so that the fan radiates according to the number of rotations of the fan body (22).