JPH08248965A - Control part temperature adjusting structure for active muffler - Google Patents

Abstract

PURPOSE: To properly maintain its peripheral temp. even while protecting a control part from a very bad environmental condition such as dust, etc., for an active muffler whose control part is constituted integrally with a duct. CONSTITUTION: A control unit 12 is housed and arranged in the space E of a nearly sealed state and constituted of a housing member 11 and an outer side surface of a muffling vessel 6 for the active muffler 1 provided in the roofspace integrally with the duct 5. A communicating hole 6c on the outer side surface of the muffling vessel 6, and a discharge port 11b on the housing member 11 are provided respectively, and the temp. of the control unit 12 is adjusted properly by introducing a part of air-conditioned air flowing through duct inside space C to the space E by a pressure difference between the space C and the roof-space B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control structure for a control section of an active silencer, and more particularly to a control device for silencing noise propagating inside an air-conditioning duct disposed in a space above the ceiling. The present invention relates to a structure for appropriately adjusting the ambient temperature.

[0002]

2. Description of the Related Art Conventionally, as an example of an active silencer for detecting noise in a duct space as a fluid passage and reducing the noise, there has been known one disclosed in Japanese Patent Laid-Open No. 5-323974. This type of active silencer includes a detection microphone, an adaptive FIR (Finite I)
A control unit having an npulse response filter and a speaker are provided. Then, after generating an inverted sound signal having the same amplitude and an opposite phase with respect to the noise signal based on the noise in the duct detected by the detection microphone by the adaptive FIR filter, the inverted sound signal is input to the speaker to generate the noise in the duct. The reverse sound that cancels out is radiated to the sound dead space in the duct.

Further, a monitor microphone is arranged at a predetermined observation point in the sound dead space, and the monitor microphone detects the synthesized sound of the noise in the duct and the reversal sound at the observation point as the noise in the duct. Then, this synthesized sound signal is fed back to the adaptive FIR filter, and the filter coefficient of the adaptive FIR filter is sequentially updated so that the synthesized sound signal level becomes smaller, thereby reducing the sound pressure level at the observation point. ing.

[0004]

By the way, in the above-described active muffler, since the control section is provided with a plurality of electronic parts, they generate heat and the ambient temperature of the control section rises. Cooling of electronic components is desired because they may adversely affect the electronic components and hinder their operation. Then, when the control unit is installed at a position away from the duct and the speaker or the like is remotely operated, the control unit can be cooled well by adopting a structure with high heat dissipation. That is, high heat dissipation can be obtained by means such as forming a large number of ventilation holes in the casing that houses each electronic component of the control unit.

However, when the control unit is constructed integrally with the duct, the control unit is arranged in the space above the ceiling or the like. Then, in this case, in order to prevent the dust in the space above the ceiling from adversely affecting the control unit, it is necessary to store the control unit in a closed container.

However, in this case, especially in the summer, the heat generated from the electronic components is accumulated in the closed container without being radiated, and there is a concern that the above-mentioned heat may adversely affect the electronic components.

On the contrary, even if the ambient temperature of the electronic component is too low (for example, -5 ° C.), the operation thereof may be hindered. Especially in cold regions, there is a concern that such a situation may occur.

From these points, in order to operate this electronic component satisfactorily, it is necessary to always stably maintain the ambient temperature of the control unit at an appropriate temperature.

The present invention has been made in view of the above-mentioned problems, and an active muffling apparatus in which a control unit is integrally formed with a duct is provided while protecting the control unit from bad environmental conditions such as dust. Also aims to maintain the ambient temperature appropriately.

[0010]

In order to achieve the above object, in the present invention, the temperature of the control section is adjusted by the conditioned air flowing in the duct. Specifically, claim 1
As shown in FIG. 4, the invention described above is provided integrally with a passage member (5, 6) in which a fluid passage (C) through which a fluid of a predetermined temperature flows is formed, and a substantially sealed internal space. The microphone is housed in the housing member (11) having (E).
A reversing sound signal having the same phase and an opposite phase with respect to the noise signal of the noise in the fluid passage (C) detected by (8) is generated, and the reversing sound signal is transmitted to the speaker (9). It is premised on an active muffling device equipped with a control unit (12) that radiates a reversal sound based on the reversal sound signal from 9) to the fluid passage (C) to muffle noise in the fluid passage (C). A temperature adjusting means (20) for adjusting the temperature of the control section (12) within a predetermined range by the fluid flowing through the fluid passage (C) is provided.

According to a second aspect of the present invention, there is provided the control part temperature adjusting structure of the active silencer according to the first aspect,
The temperature adjusting means (20) is provided in the passage member (6) and the fluid passage is provided.
An introduction passage (6c) for introducing the fluid of (C) into the internal space (E) of the containing member (11), and is introduced into the internal space (E) of the containing member (11) provided in the containing member (11). Outside the storage member (11)
It is configured to have a discharge passage (11b) for discharging to (B).

According to a third aspect of the present invention, there is provided the control part temperature adjusting structure for the active silencer according to the second aspect.
The control unit (12) is provided with a plurality of electronic devices (12a, 12b), and the internal space (E) of the housing member (11) is replaced with the electronic device housing space (G) in which the electronic devices (12a, 12b) are housed. And a temperature control space (H) in which the introduction path (6c) and the discharge path (11b) are opened are partitioned by a partition plate (21) having thermal conductivity.

According to a fourth aspect of the present invention, as shown in FIG. 7, in the control part temperature adjusting structure of the active muffler according to the third aspect, one end is introduced into the temperature adjusting space (H) at the introduction path (6c). And a guide tube (22) which is opened so that the other end faces the partition plate (21).

According to a fifth aspect of the present invention, as shown in FIG. 8, in the control part temperature adjusting structure of the active silencer according to the third or fourth aspect, the electronic device (12b) is partitioned by a partition plate.
It is configured to be in contact with (21) so that heat can be transferred.

According to a sixth aspect of the present invention, as shown in FIG. 10, in the temperature control structure of the control section of the active silencer according to the second aspect, in the internal space (E) of the housing member (11),
A temperature adjusting pipe (23) is provided, one end of which is connected to the introduction path (6c) and the other end of which is connected to the discharge path (11b).

According to a seventh aspect of the present invention, as shown in FIG. 12, in the control part temperature adjusting structure of the active muffler according to the first aspect, the temperature adjusting means (20) is provided with a passage member.
Internal space of fluid passage (C) and storage member (11) provided in (6)
A pair of communication passages (6c, 6d) communicating with (E), and a temperature control pipe (23) having one end communicating with one communication passage (6c) and the other end communicating with the other communication passage (6d). It is configured to include.

According to an eighth aspect of the present invention, as shown in FIG. 14, in the control part temperature adjusting structure of the active muffler according to the first aspect, the temperature adjusting means (20) has a housing member (11) at one end. ) Internal space (E) with the other end
The heat exchange member (24) located at (C) is used.

According to a ninth aspect of the present invention, there is provided a control part temperature adjusting structure for an active silencer according to the eighth aspect.
The control unit (12) is provided with a plurality of electronic devices (12a, 12b), and the electronic device (12b) is in contact with the heat exchange member (24) so as to be able to transfer heat.

The invention according to claim 10 is the above-mentioned claim 1,
In the control part temperature adjusting structure of the active silencer according to 2, 3, 4, 5, 6, 7, 8 or 9, the passage member is
It is composed of an air conditioning duct (5) located in the space above the ceiling (B).

The invention according to claim 11 is the above-mentioned claim 1,
In the control part temperature adjusting structure of the active silencer according to 2, 3, 4, 5, 6, 7, 8, 9 or 10, the control part
(12) is equipped with an adaptive FIR filter (13) that changes the filter coefficient so as to generate an inverted sound signal of the same amplitude in antiphase with respect to the noise signal from the microphone (8). ) Is provided with a monitor microphone (10) for detecting a reduced sound level and feeding the reduced sound signal back to the adaptive FIR filter (13) at a predetermined observation point on the downstream side of the speaker in the noise propagation direction. Then, the adaptive FI
The R filter (13) is configured to update the filter coefficient so as to reduce the sound pressure level around the observation point based on the feedback reduced sound signal.

[0021]

With the above construction, the following effects can be obtained in the present invention. According to the first aspect of the present invention, the noise in the fluid passage (C) is detected by the microphone (8) during the silencing operation of the noise in the fluid passage (C).
A noise signal is transmitted from (8) to the control unit (12). The control unit (12) also generates an inverted sound signal having the same amplitude and an opposite phase with respect to the received noise signal, and outputs the inverted sound signal to the speaker.
Send to (9). Further, the speaker (9) receiving this inverted sound signal produces an inverted sound based on this inverted sound signal in the fluid passage (C).
Radiates to, which silences the noise in the fluid passage (C). During such a silencing operation, the control unit (1
The temperature of 2) is controlled by the temperature control means (20).
It is adjusted within the specified range by the fluid flowing through (C). Therefore, even if the control unit (12) is housed in the substantially sealed space (E) to avoid the adverse effects of dust and the like, it is possible to suppress the adverse effects of temperature due to heat generation, etc. Occurrence of defects is avoided.

According to the second aspect of the invention, as the temperature adjusting operation of the control section (12), a part of the fluid in the fluid passage (C) is introduced from the introduction passage (6c) into the internal space (E) of the accommodating member (11). ) Is introduced into the internal space (E) to perform heat exchange with the control unit (12), and then the fluid is discharged from the discharge passage (11b) to the outside of the containing member (11).
It will be discharged to (B). That is, the fluid and the control unit (1
The temperature of the control part (12) is adjusted by direct contact with the (2).

According to the third aspect of the present invention, a part of the fluid in the fluid passage (C) is introduced into the temperature adjusting space (H) from the introduction passage (6c) and the electronic equipment accommodating space via the partition plate (21). After exchanging heat with (G), the heat is discharged from the discharge passage (11b) to the outside (B) of the containing member (11). Therefore, when the control unit (12) is cooled by the cold air, the cold air is not blown directly to the control unit (12).
The occurrence of dew condensation in (12) is suppressed, and the occurrence of malfunction is avoided.

According to the fourth aspect of the invention, the fluid introduced into the guide pipe (22) from the introduction passage (6c) is supplied from the open end of the guide pipe (22) toward the partition plate (21). Become this partition board
By heat exchange between (21) and the electronic equipment housing space (G),
The temperature of the control unit (12) is effectively adjusted.

According to the invention of claim 5, the electronic device (12b)
Since heat is directly exchanged between the partition plate (21) and the partition plate (21),
The electronic device (12b) can be surely adjusted to an appropriate temperature.

In the invention of claim 6, a part of the fluid in the fluid passage (C) is introduced into the temperature adjusting pipe (23) from the introducing passage (6c), and the pipe wall of the temperature adjusting pipe (23) is introduced. Heat exchange with the internal space (E) of the housing member (11) via the
b) is discharged from. Also in this case, when the control unit (12) is being cooled, the cool air is not blown directly to the control unit (12), so that the occurrence of dew condensation in the control unit (12) is suppressed.

In the invention according to claim 7, the fluid introduced from the fluid passageway (C) to the temperature adjustment pipe (23) through the one communication passageway (6c) passes through the pipe wall of the temperature adjustment pipe (23). Via receiving member (11)
After exchanging heat with the internal space (E), the other communication passage (6d) is returned to the fluid passage (C). Therefore, the flow rate of the fluid in the fluid passage (C) does not decrease, and it is not necessary to form a hole in the containing member (11).

In the invention according to claim 8, the heat exchange member is provided between the internal space (E) of the containing member (11) and the fluid passage (C).
The heat transfer is performed by (24), and the internal space of the containing member (11)
The temperature of (E) is adjusted appropriately.

According to the invention of claim 9, the electronic device (12b)
Since heat is directly exchanged between the heat exchange member (24) and the heat exchange member (24), the electronic device (12b) can be reliably adjusted to an appropriate temperature.

According to a tenth aspect of the invention, an air conditioning duct
(5) The control part (12) is adjusted to an appropriate temperature by the conditioned air flowing inside, and the control part (12) is housed in the housing member (11) so that the space above the ceiling (B) is There is no adverse effect due to dust.

According to the eleventh aspect of the invention, the adaptive FIR filter (1) is based on the noise signal from the microphone (8).
The inverted sound signal generated by 3) is input to the speaker (9), and the inverted sound is radiated from the speaker (9) to the fluid passage (C). Further, the monitor microphone (10) detects the reduced sound level at a predetermined observation point, feeds back the reduced sound signal to the adaptive FIR filter (13), and based on this, the adaptive FIR filter
The filter coefficient of the filter (13) is updated to reduce the sound pressure level around the observation point. Since such a silencing operation is performed, the sound pressure level in the fluid passage (C) is optimally reduced when the filter coefficient converges.

[0032]

【Example】

(First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings. Further, in this example, a case will be described in which the active silencer according to the present invention is used to reduce noise in the air conditioning duct.

FIG. 1 shows an overall view of the air conditioning system according to this example, and FIG. 2 shows the overall configuration of the active silencer (1). In FIG. 1, (2) is an air conditioner main body that generates conditioned air, and (3) is a supply unit that supplies conditioned air to the indoor space (A) with the lower surface having an outlet facing the room. . The air conditioner body (2) and the supply unit (3) are connected to the structure (beam) (4) in the space above the ceiling (B).
The air conditioning air generated in the air conditioner body (2) is hung from the supply unit (3) through the duct (5) and is connected to the room through the duct (5). It is designed to be blown out into the space (A).

In the middle of the duct (5), the duct generated in the air conditioner body (2) is directed toward the supply unit (3).
(5) An active silencer (1) is provided to reduce the noise propagating inside. This silencer (1) is shown in FIG.
As also shown, a box-type sound-deadening container (6) having a passage area larger than that of the duct (5) and forming a part of the passage member,
The sound absorbing container (6) is provided with a reversal sound generating portion (7) integrally attached to the outer surface thereof, and the sound absorbing container (6) is suspended and supported by the beam (4) (see FIG. 1). Also, as shown in FIG.
A glass wool (6a) of a specified thickness is attached to the entire inner wall surface of this sound deadening container (6), and it is provided between the duct internal space (C) as a fluid passage and the space above the ceiling (B). The heat exchange is suppressed to make the conditioned air less susceptible to the temperature in the space above the ceiling (B), and the reflection of sound in the space inside the duct (C) is prevented, and the sound is silenced by the active silencer (1). We are trying to improve performance. The same glass wool is also attached to the inner wall surface of the duct (5).

This silencer (1) is a silencer container.
A detection microphone (8) that is placed in the duct (5) at the upstream end of (6) and detects the noise that is generated in the air conditioner body (2) and propagates in the duct internal space (C); A speaker (9) that is provided in the generator (7) and radiates a reversal sound having the same amplitude and a phase opposite to that of the noise at the position downstream of the detection microphone (8) to the duct internal space (C), and a muffling container.
The synthesized sound of the noise propagating in the duct internal space (C), which is placed in the duct (5) at the downstream end of (6), and the reversal sound emitted from the speaker (9), is generated on the downstream side of the speaker (9). It is equipped with a monitor microphone (10) that detects at the observation point.

Further, the structure of the inversion sound generation unit (7) will be described in detail. The inversion sound generation unit (7) will be described with reference to FIGS.
As shown in Fig. 2, a part of the accommodating member with an open U-shape
(11) is attached to the outer side surface of the sound deadening container (6), and a closed space is formed between the housing member (11) and the sound deadening container (6). In addition, the inside of this closed space is partitioned by a partition plate (11a) extending in a direction orthogonal to the extension direction of the duct (5), and the first and second spaces (D, E) are independent from each other.
It is divided into The speaker (9) is housed in the first space (D) (the space on the left side in FIGS. 3 and 4) located on the downstream side in the air flow direction of the two spaces, while in the air flow direction. In the second space (E) (the space on the right side in FIGS. 3 and 4) as the accommodation member internal space located on the upstream side, the control unit (12) as the control unit that generates the radiated sound emitted by the speaker (9). ) Is housed. In this control unit (12), electronic parts such as an arithmetic chip (12a) and a speaker driving IC amplifier (12b) are printed circuit board (1
2c) It is made up of multiple pieces arranged on top. In addition, the printed circuit board (12c) has legs (12d, 1) on the back surface in order to avoid the back surface from directly contacting the outer surface of the sound deadening container (6).
2d), and the legs (12d, 12d) are attached to the outer surface of the sound deadening container (6). For this reason, the printed circuit board (12c)
A slight space (F) is formed between the sound absorbing container and the outer surface of the sound absorbing container (6). In addition, the speaker (9) in the silencer container (6)
An opening (not shown) is formed in the portion corresponding to the installation position of the glass wool (6a) in order to propagate the sound emitted from the speaker (9) to the duct internal space (C). An opening (6b) is also formed in a part.

Further, as shown in FIG. 2, the control unit (12) has an adaptive FIR filter (1) which receives the output signals of the detection microphone (8) and the monitor microphone (10).
It has 3). This adaptive FIR filter (13) has a muffling filter (13a) and an adjusting section (13b) for adaptive control, and the muffling filter (13a) is basically a noise signal received from the detection microphone (8). An inverted sound signal having the opposite phase and the same amplitude is generated. The adjusting part (13b)
The adaptive control is performed by a least mean square method (LMS; Least Mean Square) algorithm. That is, based on the noise signal received from the detection microphone (8) and the synthetic sound signal fed back from the monitor microphone (10), the LMS is arranged to reduce the sound pressure level at the observation point in the sound deadening container (6). Update the filter coefficient of the silence filter (13a) as the control parameter of
The inverted sound signal in 3a) is adaptively controlled and corrected. The inverted sound signal generated by the sound deadening filter (13a) is input to the speaker (9).

Next, the characteristic configuration of this example will be described. As shown in FIG. 4, the duct inner space is provided in the wall of the sound deadening container (6) and the glass wool (6a) corresponding to the second space (E) in which the control unit (12) is housed.
Communication hole as an introduction path that connects (C) and the second space (E)
(6c) is formed to penetrate. Further, a part of the housing member (11) corresponding to the second space (E) (upper surface part in FIG. 4) is provided with a discharge path for communicating the second space (E) with the space above the ceiling (B). The exhaust hole (11b) is formed. That is, the duct inner space (C) is in communication with the ceiling space (B) through the second space (E) by the communication hole (6c) and the exhaust hole (11b). In addition, the communication hole (6c) and the exhaust hole (11b) have dust in the space above the ceiling (B) in the second space.
It consists of a small-diameter opening that does not enter the (E) or the duct internal space (C). By forming such holes (6c, 11b), when the conditioned air is flowing through the duct internal space (C) during air conditioning operation, this duct internal space
Since the pressure in (C) becomes higher than the pressure in the space above the ceiling (B), part of the conditioned air in the space inside the duct (C) becomes the second space.
It is designed to flow toward the above-ceiling space (B) via (E). The temperature adjusting means (20) is configured in this way.

Next, the silencing operation for silencing the noise in the duct (5) using the above active silencing device (1) will be described. First, ducts generated from the air conditioner body (2)
(5) The noise propagating inside is detected by the detection microphone (8). Then, a noise signal based on the detected noise is input from the detection microphone (8) to the adaptive FIR filter (13). Then, the adaptive FIR filter (1
The mute filter (13a) in 3) generates an inverted sound signal having the same amplitude as the noise signal in the opposite phase, and the inverted sound signal is input to the speaker (9) and the inverted sound signal is output from the speaker (9). Is radiated into the muffler container (6). This allows the duct
The noise inside (5) is well reduced by the reversal sound radiated from the speaker (9).

Further, the reduced noise level is detected by the monitor microphone (10), and the reduced noise signal, that is, the reduced sound signal is applied to the adaptive FIR filter (13).
Is fed back to the adjusting section (13b) of the LMS and the muffler filter (13) of the LMS control parameter is based on the reduced sound signal.
The filter coefficient of a) is updated sequentially. For this reason, the reversal sound signal is generated by the sound deadening filter (13a) with respect to the noise in the duct (5) with high accuracy over time, and when the filter coefficient converges, the sound in the duct (5) is generated. The pressure level is best reduced.

The operation characteristic of this example is as follows.
This is the temperature adjustment operation of the peripheral portion of the control unit (12) during the above-described operation. Specifically, when conditioned air is flowing through the duct internal space (C), this duct internal space (C)
Is higher than the pressure in the space above the ceiling (B),
Due to this pressure difference, part of the conditioned air in the duct internal space (C) flows into the second space (E) through the communication hole (6c), and then this air passes through the exhaust hole (11b) and above the ceiling space. It is discharged to (B). In other words, during the cooling operation of the air conditioner main body (2), cold air enters the second space (E) from the duct internal space (C) once during the heating operation, and each device of the control unit (12).
Heat will be exchanged with (12a, 12b) and the heat will be discharged into the space above the ceiling (B). That is, the second space (E) inside the containing member (11)
Temperature is almost equal to the set temperature in the room (for example, 20
It will be adjusted to (° C) and each device (1
2a, 12b) are cooled, and each device (12a, 12b) during heating operation
Is heated. As a result, the ambient temperature of each device (12a, 12b) is always maintained appropriately and stably.

As described above, according to this example, the control unit is effectively utilized by utilizing a part of the conditioned air in the duct internal space (C).
The ambient temperature of each device (12a, 12b) in (12) can be appropriately adjusted, and each device (12a, 12b) is suppressed from being adversely affected by the ambient temperature, and the device (12a, 12b) Occurrence of malfunction is avoided, and the control reliability of the control unit (12) is sufficiently ensured. Also, the accommodating member (11) has a small-diameter exhaust hole.
(11b) is only formed, and the control unit (1
Since 2) is stored in the substantially sealed space by this storage member (11), invasion of dust into the second space (E) is avoided, and each device (12a, 12b) is It is not adversely affected by dust, and this also ensures sufficient control reliability of the control unit (12). Therefore, the performance of this active silencer (1) is fully demonstrated and
The quietness of (A) can be satisfactorily obtained.

In this example, a communication hole (6c) extending from the glass wool (6a) to the outer surface of the sound deadening container (6) is used as an air introduction path.
However, a small-diameter pipe may be inserted into the communication hole (6c) to ensure the introduction path for the glass wool (6a).

(Second Embodiment) Next, a second embodiment according to the present invention will be described. In addition, this example is a modification of the second space (E) and its peripheral portion, and other configurations are the same as those of the above-described first embodiment, so only the characteristic part thereof will be described here.

As shown in FIG. 5, in this example, the second space
(E) is the extension direction of the duct (5) (left and right in Fig. 5)
A partition plate (21) made of a material with a relatively high thermal conductivity, such as copper or aluminum, extending vertically along the control unit accommodates the control unit accommodation space (G) and the temperature adjustment space (H) as the electronic equipment accommodation space. It is partitioned. And, while the control unit (12) is housed in the control unit housing space (G),
The temperature control space (H) communicates with the duct internal space (C) through the communication hole (6c) and the ceiling space (B) through the exhaust hole (11b).

According to this structure, the air introduced into the temperature control space (H) through the communication hole (6c) is discharged into the space above the ceiling (B) through the exhaust hole (11b). Therefore, the temperature adjusting air and the control unit accommodating space (G) are heat-exchanged with each other through the partition plate (21), whereby the ambient temperature of the control unit (12) is appropriately set. And, especially in the case of this example, during the cooling operation, air (cold air) is supplied to the control unit.
Since it is not sprayed directly on (12), the control unit
The occurrence of dew condensation at (12) is suppressed, and the problem of control failure of the control unit (12) due to this dew condensation is avoided, and the active silencer
The reliability of the silencing performance of (1) can be improved.

(Third Embodiment) Next, a third embodiment according to the present invention will be described. Also, in this example, only the characteristic part will be described.

As shown in FIG. 7, in the present example, the second space (E) is divided by the partition plate (21) into the control unit accommodating space (G) and the temperature adjusting space (H) as in the second embodiment. ) And Then, in the communication hole (6c), the air introduced from the communication hole (6c) is substantially L so as to be blown toward the partition plate (21).
A guide tube (22) bent into the mold is connected. That is,
One end of the guide pipe (22) is connected to the communication hole (6c) and the other end is open so as to face the partition plate (21).

According to this structure, the air introduced from the communication hole (6c) is guided by the guide pipe (22) and is guided by the partition plate (21).
The partition plate (21) is temperature-adjusted and then discharged from the exhaust hole (11b) to the space above the ceiling (B). Therefore, the heat exchange between the partition plate (21) and the control unit accommodating space (G) is favorably performed, and the control unit (1
It is possible to improve the cooling property of the control unit (12) while suppressing the occurrence of dew condensation in (2).

(Fourth Embodiment) Next, a fourth embodiment according to the present invention will be described. This example has the same basic configuration as that of the third example described above, and the IC amplifier of the control unit (12) is
It is a modification of the arrangement state of (12b). Specifically, as shown in FIG. 8, the IC amplifier (12b) has a partition plate (2
It is housed in the control unit housing space (G) while being attached to 1).

This is because each electronic device (1
Among the 2a, 12b), the IC amplifier (12b) has a large amount of heat generation. Therefore, by attaching this to the partition plate (21), the cooling performance is improved during cooling operation, and the control unit accommodation space is increased. (G) It is a structure for surely lowering the overall temperature.

In the second to fourth embodiments described above, the partition plate (21) is used to control the control unit accommodation space (G) and the temperature adjustment space.
The partition plate (21)
In the control unit (12), an opening is formed at a position where air is not blown directly to the control unit accommodation space.
Air may also be introduced into (G).

(Fifth Embodiment) Next, a fifth embodiment according to the present invention will be described. As shown in FIGS. 9 and 10,
In this example, a temperature adjusting tube (23) for circulating temperature adjusting air is arranged in a space (F) between the printed circuit board (12c) and the outer surface of the sound deadening container (6). Specifically, the temperature control pipe (23) is made of copper or aluminum and has the above space.
In (F), it is bent at multiple points, and its upstream end is connected to the communication hole (6c), and its downstream end is connected to the exhaust hole (11b) formed on the side surface of the housing member (11). ing. The temperature adjusting means (20) is configured in this way. Therefore, during the air conditioning operation, the ambient temperature of the control unit (12) is adjusted via the space (F) by the air flowing through the temperature adjusting pipe (23). According to such a configuration,
It is possible to avoid the occurrence of dew condensation of the control unit (12) during the cooling operation without partitioning the second space (E) with the partition plate.

(Sixth Embodiment) Next, a sixth embodiment according to the present invention will be described. This example has the same basic configuration as that of the fifth example described above, and is a modification of the downstream end side of the temperature adjusting pipe (23). Specifically, as shown in FIGS. 11 and 12, the downstream end of the temperature control pipe (23) communicates with the duct internal space (C). That is, the communication holes (6c, 6d) are formed at two locations on the outer surface of the sound deadening container (6), and the upstream end and the downstream end of the temperature control pipe (23) are connected to each of them.

According to this structure, the air flowing in the duct internal space (C) can be once introduced into the temperature adjusting pipe (23) in the second space (E) and then returned to the duct internal space (C) again. As a result, the amount of air blown out into the indoor space (A) does not decrease, and since it is not necessary to form holes in the accommodation member (11), it is possible to ensure the entry of dust into the space above the ceiling (B). Can be prevented.

(Seventh Embodiment) Next, a seventh embodiment according to the present invention will be described. As shown in FIGS. 13 and 14, in this example, a heat exchange plate (24) is provided as a heat exchange member extending from the second space (E) to the duct internal space (C). Specifically, the heat exchange plate (24) is made of copper or aluminum, and extends vertically in parallel with the partition plate (11a) and has a lower end portion facing the duct internal space (C), and a vertical plate portion (24a), The horizontal plate portion (24b) is attached to the lower end of the vertical plate portion (24a) and extends in the horizontal direction. The temperature adjusting means (20) is configured in this way. Then, the IC amplifier (1 of the control unit (12)
2b) is housed in the second space (E) with its rear surface attached to the vertical plate portion (24a).

According to this structure, heat is exchanged between the duct internal space (C) and the second space (E) inside the accommodating member (11) via the heat exchange plate (24). In particular, during cooling operation, the heat generated from the IC amplifier (12b), which generates a large amount of heat, passes through the vertical plate part (24a) and the horizontal plate part (24b) of the heat exchange plate (24) and becomes the space inside the duct. The heat is dissipated in (C), which cools the IC amplifier (12b) well.

In each of the above-mentioned embodiments, the active silencer is used to reduce the noise in the air conditioning duct, but the present invention is not limited to this, and a space in which a fluid (air) of a predetermined temperature flows. The present invention can be applied to various devices that muffle the sound.

[0059]

As described above, according to the present invention, the following effects are exhibited. According to the first aspect of the present invention, there is provided an active muffling device that muffles noise in a fluid passage through which a fluid of a predetermined temperature flows, wherein a control section housed in a substantially sealed space is integrally provided in the passage member. On the other hand, since the temperature adjusting means for adjusting the temperature of the control unit within a predetermined range by the fluid flowing through the fluid passage is provided, it is possible to prevent the control unit from being adversely affected by the temperature and avoid the occurrence of malfunction thereof. As a result, the reliability of control is sufficiently ensured. Therefore, while protecting the control unit from bad environmental conditions such as dust, the ambient temperature can be appropriately maintained, and the performance of the active silencer can be fully exerted.

According to the second aspect of the present invention, the passage member is provided with the introduction passage, and the accommodation member is provided with the discharge passage. After introducing the fluid of the fluid passage from the introduction passage into the internal space of the accommodation member,
Since the fluid is discharged to the outside of the housing member through the discharge path, the temperature of the control section can be adjusted by direct contact between the fluid and the control section, and the highly efficient temperature adjustment operation can be performed.

According to the third aspect of the present invention, the internal space of the housing member is partitioned into the electronic equipment housing space and the temperature adjusting space by the partition plate, and air for temperature adjustment is introduced into the temperature adjusting space and controlled by cold air. When the parts are cooled, the cold air is not blown directly to the control part, so the occurrence of dew condensation in the control part is suppressed, the occurrence of malfunctions is avoided, and the control of the active silencer is reliable. It is possible to improve the sex.

According to the fourth aspect of the invention, since the temperature adjusting space is provided with the guide tube for supplying the temperature adjusting air toward the partition plate, the space between the partition plate and the electronic equipment accommodating space is provided. The heat exchange is effectively performed, and the temperature of the control unit is quickly adjusted.

According to the fifth aspect of the present invention, the electronic device is brought into contact with the partition plate so that heat can be transferred, and heat is directly exchanged between the electronic device and the partition plate. The temperature can be surely adjusted to an appropriate temperature, and the reliability can be further improved.

According to the sixth aspect of the invention, since the temperature adjusting tube through which the temperature adjusting fluid flows is provided in the internal space of the accommodating member, this configuration also allows cool air to flow to the control section when the control section is cooled. Since it is not directly sprayed, the occurrence of dew condensation in the control unit is suppressed, and the occurrence of malfunction can be avoided.

According to the seventh aspect of the present invention, since the temperature adjusting pipe whose both ends are open to the fluid passage is provided, the fluid that has exchanged heat with the control section in the internal space of the housing member can be returned to the fluid passage. Therefore, the flow rate of the fluid in the fluid passage does not decrease. Further, it is not necessary to form a hole in the housing member, and it is possible to reliably prevent dust and the like from entering the internal space of the housing member.

According to the invention described in claim 8, since the heat exchange member for performing a heat exchanger is provided between the internal space of the containing member and the fluid passage, the temperature of the internal space of the containing member can be controlled with a simple structure. It can be adjusted appropriately.

According to the ninth aspect of the invention, the electronic device is brought into contact with the heat exchange member so as to be able to transfer heat, and the heat exchange efficiency of the electronic device is improved. Therefore, the electronic device is surely adjusted to an appropriate temperature. Therefore, the reliability can be further improved.

According to the tenth aspect of the invention, since the fluid passage is the internal space of the air conditioning duct, it is possible to surely muffle noise propagating into the room connected to the air conditioning duct, and the ceiling. It is possible to avoid adverse effects on the control unit due to dust in the back space.

According to the eleventh aspect of the present invention, the adaptive FIR filter provided in the control unit is arranged to reduce the sound pressure level around the observation point based on the reduced sound signal fed back from the monitor microphone. Therefore, the sound deadening performance of the active sound deadening device can be improved.

[Brief description of drawings]

FIG. 1 is an overall view of an air conditioning system according to an embodiment.

FIG. 2 is a diagram showing a schematic configuration of the entire active silencer.

FIG. 3 is a partially cutaway perspective view showing the active silencer of the first embodiment.

FIG. 4 is a sectional view showing an active silencer of the first embodiment.

FIG. 5 is a cross-sectional view showing the inside of a reflected sound generator in the second embodiment.

6 is a cross-sectional view of a portion corresponding to line VI-VI in FIG.

FIG. 7 is a view corresponding to FIG. 6 in the third embodiment.

FIG. 8 is a view corresponding to FIG. 6 in the fourth embodiment.

FIG. 9 is a view corresponding to FIG. 5 in the fifth embodiment.

FIG. 10 is a sectional view of a portion corresponding to line XX in FIG.

FIG. 11 is a view corresponding to FIG. 9 in the sixth embodiment.

FIG. 12 is a view corresponding to FIG. 10 in the sixth embodiment.

FIG. 13 is a view corresponding to FIG. 4 in the seventh embodiment.

FIG. 14 is a perspective view showing a control unit and its peripheral portion in a seventh embodiment.

[Explanation of symbols]

 (1) Active silencer (5) Duct (passage member) (6) Silence container (passage member) (6c, 6d) Communication hole (introduction passage) (8) Detection microphone (9) Speaker (10) Monitor microphone (11) ) Housing member (11b) Exhaust hole (exhaust path) (12) Control unit (control section) (12a) Computing chip (electronic device) (12b) IC amplifier (electronic device) (13) Adaptive FIR filter (20) Temperature control means (21) Partition plate (22) Guide tube (23) Temperature control tube (24) Heat exchange plate (heat exchange member) (B) Ceiling space (external) (C) Duct internal space (fluid passage) ( E) Second space (inner space of accommodation member) (G) Control unit accommodation space (electronic equipment accommodation space) (H) Temperature adjustment space

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // H03H 21/00 G10K 11/16 B

Claims (11)

[Claims] 1. A fluid passage in which a fluid having a predetermined temperature flows.
A housing member (11) that is provided integrally with the passage member (5, 6) in which (C) is formed and that has a substantially sealed internal space (E).
Is housed in the speaker, and generates a reversal sound signal of the same amplitude in antiphase with respect to the noise signal of the noise in the fluid passage (C) detected by the microphone (8), and the reversal sound signal is generated by the speaker (9).
To the fluid passageway (C) by transmitting the sound to the fluid passageway (C) from the loudspeaker (9) to the fluid passageway (C) to silence the noise in the fluid passageway (C). In the above, the temperature of the control part of the active silencer is characterized in that temperature control means (20) for adjusting the temperature of the control part (12) within a predetermined range by the fluid flowing through the fluid passage (C) is provided. Adjustment structure. 2. The temperature adjusting means (20) is provided in the passage member (6) and stores the fluid in the fluid passage (C) in the internal space (E) of the containing member (11).
The discharge passage (6c) to be introduced into the housing member (11) and the fluid introduced into the internal space (E) of the housing member (11) to the outside (B) of the housing member (11) The control part temperature adjusting structure of the active muffler according to claim 1, further comprising: a path (11b). 3. The control unit (12) includes a plurality of electronic devices (12a, 12b).
The interior space (E) of the accommodation member (11) has an electronic equipment accommodation space (G) in which the electronic equipment (12a, 12b) is accommodated, an introduction path (6c), and an ejection path (11b). The control part temperature adjusting structure of the active muffler according to claim 2, characterized in that the temperature adjusting space (H) to be opened is partitioned by a partition plate (21) having heat conductivity. 4. The temperature control space (H) has an introduction path (6) at one end.
The control part temperature adjusting structure of the active muffler according to claim 3, further comprising a guide pipe (22) connected to c) and having the other end opened so as to face the partition plate (21). . 5. The electronic device (12b) is in contact with the partition plate (21) in a heat-transferable manner.
The temperature control structure for the control unit of the described active silencer. 6. An internal space (E) of the housing member (11) is provided with a temperature adjusting pipe (23), one end of which is connected to the introduction path (6c) and the other end of which is connected to the discharge path (11b). The control part temperature adjusting structure of the active muffler according to claim 2, wherein 7. A pair of communication passages (6c, 6d) provided in the passage member (6) for communicating the fluid passage (C) with the internal space (E) of the containing member (11). ) And one end is a communicating passage
The control part temperature adjusting structure for an active silencer according to claim 1, characterized in that the (6c) is provided with a temperature adjusting pipe (23), the other end of which communicates with the other communicating passage (6d). 8. The temperature adjusting means (20) has a housing member at one end.
Control of the active muffler according to claim 1, characterized in that it comprises a heat exchange member (24) located in the internal space (E) of the (11) and the other end of which is located in the fluid passage (C). Part temperature adjustment structure. 9. The control unit (12) includes a plurality of electronic devices (12a, 12b).
9. The control part temperature adjusting structure for an active silencer according to claim 8, wherein the electronic device (12b) is in contact with the heat exchange member (24) so that heat can be transferred. 10. The passage member comprises an air-conditioning duct (5) arranged in the space above the ceiling (B), as claimed in claim 1, 2, 3, 4, 5, 6, 7, 8. The temperature control structure for the control unit of the active silencer according to 8 or 9. 11. The control unit (12) includes an adaptive FIR filter (13) for changing a filter coefficient so as to generate an inverted sound signal having the same amplitude and an opposite phase with respect to the noise signal from the microphone (8). A monitor microphone (10) that is provided and detects the reduced sound level and feeds the reduced sound signal back to the adaptive FIR filter (13) at a predetermined observation point on the downstream side of the speaker in the direction of noise propagation in the fluid passage (C). The adaptive FIR filter (13) updates the filter coefficient so as to reduce the sound pressure level around the observation point based on the fed back reduced sound signal. Item 1. A control part temperature adjusting structure for an active silencer according to items 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.