CN210624871U - Broadband noise reduction device for fresh air equipment - Google Patents
Broadband noise reduction device for fresh air equipment Download PDFInfo
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- CN210624871U CN210624871U CN201921573446.8U CN201921573446U CN210624871U CN 210624871 U CN210624871 U CN 210624871U CN 201921573446 U CN201921573446 U CN 201921573446U CN 210624871 U CN210624871 U CN 210624871U
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Abstract
The utility model provides a broadband noise reduction device for new trend equipment, the controller of making an uproar falls in the multichannel initiative including a plurality of modules of making an uproar and falling, a plurality of modules of making an uproar one-to-ones of falling are installed in a plurality of wind gaps department of new trend equipment, every module of making an uproar of falling all falls and all falls the tuber pipe of making an uproar, collection system and emitter, fall the tuber pipe one end of making an uproar and be linked together with the wind gap, it is equipped with the sound absorbing material layer to fall the tuber pipe inner wall of making an uproar, collection system installs in fall the inside wind gap one side of just being close to of tuber pipe of making an uproar. The utility model discloses a device of making an uproar falls in broadband is through falling the noise and falling the technique of making an uproar with the initiative passively, realizes that the advantage is complementary, and extension operating band satisfies the volume of making an uproar that falls greatly, leads to the air volume greatly, the broadband demand of making an uproar, solves the problem of mutual interference between the different sound generating mechanism sound fields through multichannel initiative noise reduction system, also can effectively reduce cost.
Description
Technical Field
The utility model belongs to the technical field of the noise control, concretely relates to a broadband noise reduction device for new trend equipment.
Background
The fresh air equipment plays an extremely important role in improving the indoor air quality, and is widely popularized in recent years in China from commercial use to civil use; fresh air equipment has also brought the noise pollution of certain degree when improving indoor air quality to user experience has been reduced. From the source, the noise of the fresh air equipment has two types of motor rotation noise and aerodynamic noise, and most of the noise is transmitted to a user sensitive area through an air pipe.
The existing noise control measures of the fresh air equipment are two types: firstly, passive noise reduction is realized, and measures such as vibration reduction, selection of a motor with lower noise, wrapping of a sound insulation material outside an air pipe, addition of a silencer at an air port and the like are commonly adopted; secondly, active noise reduction is performed, in which a series of opposite-phase sound waves are emitted through a loudspeaker to cancel noise (for example, patent document CN 201820956799.5). The former reduces noise radiation from noise sources (such as vibration reduction, motor replacement and the like) and propagation ways (a silencer and an optimized air duct) through special materials and structures, and the latter reduces noise by using a destructive interference principle of a sound field through an electronic device. An active noise reduction system includes three basic components: a controller responsible for analysis and calculation, a sensor for collecting noise, and a speaker for transmitting sound waves.
Aiming at the problems that the traditional passive noise reduction technology of the fresh air equipment is mostly used for wrapping sound insulation materials outside air pipes or installing silencers at air ports, the former method is complicated, the engineering cost is high, the noise reduction effect is poor, and the flow resistance of the latter is high; the traditional noise reduction is limited by material bottleneck, the medium and low frequency effect is poor, and the contradiction between the noise reduction amount and the ventilation amount is prominent.
The active noise reduction device disclosed in patent document CN201820956799.5 describes a basic active noise reduction system frame, but has the disadvantages that ① is only suitable for a single air port, when one device has multiple air inlets and air outlets, multiple active noise reduction devices and multiple independent controllers need to be installed in a one-to-one correspondence manner, which is high in cost, on the other hand, even if multiple independent controllers are used, noise reduction sound waves emitted by each active noise reduction device are independent from each other, and mutual interference of sound fields among multiple active noise reduction devices is not considered, so that the system cannot reach an optimal state, ② is only using an active noise reduction technology, but the existing active noise reduction technology is only suitable for medium and low frequencies, and is poor in high frequency effect, so that the device cannot meet the noise reduction requirement of a wide frequency band, and ③ is that when a sensor in the device is attached to a pipe wall, a large reflection exists when the sound field propagates in the pipe, so that the nonlinearity of the sound field near the pipe wall is obvious, and the noise reduction effect is affected.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not enough to prior art exists, the utility model provides a device of making an uproar falls in broadband for new trend equipment, this device of making an uproar falls in broadband falls the initiative of traditional passive technique of making an uproar and forward position and falls the technique of making an uproar, realizes that the advantage is complementary, and extension operating band satisfies the demand of making an uproar that falls of big noise reduction volume, big ventilation volume, broadband, solves the problem of mutual interference between the different sound generating mechanism sound fields through multichannel initiative noise reduction system, also can effectively reduce cost.
The utility model discloses a following technical scheme realizes:
a broadband noise reduction device for fresh air equipment is provided with a plurality of air ports for air inlet and air exhaust, and comprises a plurality of noise reduction modules;
the noise reduction modules are correspondingly arranged at a plurality of air inlets of the fresh air equipment one by one, each noise reduction module comprises a noise reduction air pipe, an acquisition device and an emission device, and the number of the noise reduction modules forming the broadband noise reduction device can be adjusted according to the number of the air inlet and the air outlet of the fresh air equipment;
one end of the noise reduction air pipe is communicated with the air opening, the inner wall of the noise reduction air pipe is fixedly provided with a sound absorption material layer, the sound absorption material layer can absorb most of high-frequency noise, the length and the shape (such as a square pipe) of the noise reduction air pipe can be selected and adjusted according to the noise of fresh air equipment, the flow field characteristics, the installation requirements and the like, and the thickness and the type of the sound absorption material layer can be selected and adjusted according to the frequency spectrum characteristics of actual noise and the environmental protection requirements;
the collecting device is arranged in the noise reduction air pipe and close to one side of the air port and used for acquiring noise signals, wherein the collecting device needs to have certain windproof capacity, and the installation position of the collecting device can be selected and adjusted according to the noise and flow field characteristics of fresh air equipment;
the transmitting device is arranged on the side wall of the noise reduction air pipe and far away from the air port and is used for transmitting noise reduction sound waves into the noise reduction air pipe, and the mounting position of the transmitting device can be selected and adjusted according to the noise and flow field characteristics of the fresh air equipment;
the broadband noise reduction device also comprises a multi-channel active noise reduction controller, wherein the acquisition device and the transmitting device of each noise reduction module are respectively and electrically connected with the multi-channel active noise reduction controller, the electrical connection can be wired electrical connection or wireless electrical connection, the multi-channel active noise reduction controller is used for simultaneously receiving and processing noise signals acquired by a plurality of acquisition devices and simultaneously transmitting a plurality of optimized noise reduction signals to the plurality of transmitting devices in a one-to-one correspondence manner, and the multi-channel active noise reduction controller respectively transmits noise reduction signals capable of matching and offsetting the noise signals to the corresponding transmitting devices according to the noise signals received by each acquisition device so as to avoid mutual interference of sound fields among the plurality of noise reduction modules;
when the fresh air equipment runs, noise generated by the fresh air equipment is transmitted to each air inlet and air outlet, each acquisition device of a plurality of noise reduction modules connected with the air inlets converts sound pressure signals into electric signals and transmits the electric signals to a multi-channel active noise reduction controller, the multi-channel active noise reduction controller simultaneously receives the electric signals transmitted by the acquisition devices corresponding to the noise reduction modules, the noise reduction signals are simultaneously transmitted to a plurality of transmitting devices in a one-to-one correspondence mode after data synthesis and processing calculation, each transmitting device converts the electric signals into noise reduction waves after receiving the electric signals transmitted by the multi-channel active noise reduction controller, noise reduction sound waves transmitted by each transmitting device are transmitted into the interior of each noise reduction air pipe, and when the noise is transmitted from the fresh air equipment and transmitted along the noise reduction air pipes, part of high-frequency noise is absorbed by sound absorption material layers arranged on the inner walls of the noise, the other part of noise and noise reduction sound waves emitted by the emitting device are superposed at the outlet end of the noise reduction air pipe and generate destructive interference, so that most of middle and low frequency noise can be actively reduced and absorbed, and the noise reduction process is carried out in the noise reduction air pipe of each noise reduction module, so that the outward transmission of the noise of the fresh air equipment can be greatly reduced by the mode;
the broadband noise reduction device has the advantages that the advantages are complemented through the traditional passive noise reduction technology and the active noise reduction technology at the front edge, the working frequency is expanded, the noise reduction requirements of large noise reduction amount, large ventilation amount and broadband are met, the problem of mutual interference between sound fields of different transmitting devices is solved through a multi-channel active noise reduction system, and the cost is effectively reduced.
Furthermore, every wind gap department all is equipped with the flange of being convenient for connect the tuber pipe of making an uproar that falls, fall the one end and the flange fixed connection of tuber pipe of making an uproar, the other end connection user's tuber pipe, the user's tuber pipe can be the air inlet tuber pipe or the tuber pipe of airing exhaust of new trend equipment.
Further, inhale the cotton layer of sound material for inhaling the cotton layer of sound, inhale the cotton layer of sound and fix the inner wall at the tuber pipe of making an uproar that falls, inhale the cotton layer of sound and can absorb most high frequency noise.
Further, collection system includes fixed bolster and microphone, and the top fixed mounting of fixed bolster falls the inner wall of the tuber pipe of making an uproar, and microphone fixed mounting is in the bottom of fixed bolster, and the microphone is located the center axis of the tuber pipe of making an uproar that falls, can improve noise signal collection efficiency and stability, can obtain the more superior performance of making an uproar of initiatively falling.
Further, emitter includes speaker, box base and box upper cover, the installing port has been seted up to the lateral wall of falling the tuber pipe of making an uproar, and speaker fixed mounting is inside the box base, and the speaker is used for launching the sound wave opposite with noise signal phase place, the frequency is the same, and box base fixed mounting falls tuber pipe outside wall mounting mouth department of making an uproar, and the cone of speaker just to the installing port, and the sound wave of making an uproar that falls that enables the speaker transmission gets into the inside of falling the tuber pipe of making an uproar through the installing port, and the box upper cover is installed on the box base and is closed with.
Furthermore, the multichannel active noise reduction controller is fixedly installed inside a control box of the fresh air device, it should be noted here that the fresh air device and the control box are both in the prior art, the control box includes a control circuit of the fresh air device, and the detailed structures of the fresh air device and the control box are not repeated here, and the multichannel active noise reduction controller is a device in the prior art or can be manufactured by the prior art, such as a central processing unit disclosed in CN201820956799.5, an active noise reduction system and method disclosed in CN105025419B, an active noise reduction controller disclosed in CN203840513U, and an active noise reduction system developed and produced by high technology thereof.
Furthermore, the fresh air equipment is provided with four air ports which are respectively an outdoor air inlet port, an outdoor air outlet port, an indoor air inlet port and an indoor air outlet port, the number of the noise reduction modules is four, the four noise reduction modules are respectively an outdoor air inlet noise reduction module, an outdoor air outlet noise reduction module, an indoor air inlet noise reduction module and an indoor air outlet noise reduction module, the four noise reduction modules are respectively and correspondingly installed at the four air ports, and the noise reduction device consisting of the four noise reduction modules and the multi-channel active noise reduction controller can effectively reduce noise generated when a broadband operates the fresh air machine; it should be noted here that the number of the noise reduction modules can be selected according to the number of the air inlet and the air outlet of the fresh air device.
According to the above technical scheme, the utility model provides a pair of a device of making an uproar falls in broadband for new trend equipment, beneficial effect lies in:
①, the broadband noise reduction device comprises a multi-channel active noise reduction system, a noise reduction module with an active noise reduction function is arranged between each air port and a flange, each noise reduction module can be driven by a signal from a multi-channel active noise reduction controller, the multi-channel active noise reduction system can reduce the whole noise of the fresh air equipment instead of the noise transmitted from a single air port, and the mutual influence among the noise reduction modules is eliminated;
②, the noise reduction module is fixed with sound absorption material layer on the inner wall of the noise reduction air pipe, and the sound absorption material layer and the noise reduction air pipe form a simple passive noise elimination pipeline, so that the noise reduction module has the advantages of active noise reduction and passive noise reduction, and the broadband noise processing capability is obtained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic view of the assembly structure of the present invention.
Fig. 2 is a side view of the present invention.
Fig. 3 is a sectional view taken along a line a-a in fig. 2.
In the drawings: 1-fresh air equipment, 2-flange, 3-noise reduction air pipe, 4-collecting device, 41-fixed support, 42-microphone, 5-emitting device, 51-loudspeaker, 52-box base, 53-box upper cover, 6-sound absorption material layer, 7-multichannel active noise reduction controller, 81-outdoor air inlet noise reduction module, 82-outdoor air exhaust noise reduction module, 83-indoor air inlet noise reduction module, 84-indoor air exhaust noise reduction module and 9-control box.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
In the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 3, a broadband noise reduction device for a fresh air device, wherein the fresh air device 1 is a fresh air machine, the fresh air machine is provided with four air ports, the four air ports are respectively an outdoor air inlet port, an outdoor air outlet port, an indoor air inlet port and an indoor air outlet port, and the broadband noise reduction device comprises four noise reduction modules and a multi-channel active noise reduction controller 7;
the four noise reduction modules are respectively an outdoor air inlet noise reduction module 81, an outdoor air outlet noise reduction module 82, an indoor air inlet noise reduction module 83 and an indoor air outlet noise reduction module 84, the four noise reduction modules are correspondingly arranged at four air inlets of the fresh air equipment 1 one by one, specifically, the outdoor air inlet noise reduction module 81 is arranged at the outdoor air inlet of the fresh air equipment 1, the outdoor air outlet noise reduction module 82 is arranged at the outdoor air outlet, the indoor air inlet noise reduction module 83 is arranged at the indoor air inlet, and the indoor air outlet noise reduction module 84 is arranged at the indoor air outlet;
each noise reduction module comprises a noise reduction air pipe 3, a collection device 4 and a transmitting device 5;
the inner wall of the noise reduction air pipe 3 is fixedly provided with a sound absorption material layer 6, the sound absorption material layer 6 can absorb most of high-frequency noise, it needs to be explained here that the length of the noise reduction air pipe 3 can be selected and adjusted according to the noise of the fresh air equipment 1, the flow field characteristics, the installation requirements and the like, and the thickness and the type of the sound absorption material layer 6 can be selected and adjusted according to the frequency spectrum characteristics of actual noise and the environmental protection requirements;
the collecting device 4 is arranged inside the noise reduction air pipe 3 and close to one side of the air port and used for acquiring noise signals, wherein the collecting device 4 needs to have certain windproof capacity, and the installation position of the collecting device can be selected and adjusted according to the noise and flow field characteristics of the fresh air equipment 1;
the emitting device 5 is installed on the side wall of the noise reduction air pipe 3 and on the side far away from the air port, and is used for emitting noise reduction sound waves into the noise reduction air pipe 3, and it needs to be explained here that the installation position of the emitting device 5 can be selected and adjusted according to the noise and flow field characteristics of the fresh air equipment 1;
the acquisition device 4 and the transmitting device 5 of each noise reduction module are respectively and electrically connected with a multi-channel active noise reduction controller 7, the multi-channel active noise reduction controller 7 is used for simultaneously receiving and processing noise signals acquired by the acquisition devices 4 and simultaneously transmitting the noise reduction signals to the transmitting devices 5 in a one-to-one correspondence manner, and the acquisition devices, the transmitting devices and the multi-channel active noise reduction controller form a multi-channel active noise reduction system;
this broadband noise reduction device realizes the advantage complementation through the technique of making an uproar and the initiative of falling of leading edge of traditional passive falling, expands operating frequency, satisfies the volume of making an uproar demand of making an uproar that falls greatly, the volume of ventilating greatly, broadband, solves the problem of mutual interference between the different sound generating mechanism sound fields through multichannel initiative noise reduction system, effectively the cost is reduced.
In this embodiment, every wind gap department all is equipped with the flange 2 of being convenient for connect the tuber pipe 3 of making an uproar that falls, fall the one end and the flange 2 fixed connection of tuber pipe 3 of making an uproar, the other end connection user's tuber pipe, the user's tuber pipe can be the air inlet tuber pipe or the tuber pipe of airing exhaust of new trend equipment 1.
In this embodiment, sound absorbing material layer 6 is the cotton layer of sound absorption, and the cotton layer of sound absorption is pasted and is fixed at the inner wall of the tuber pipe 3 of making an uproar that falls, and the cotton layer of sound absorption can absorb the most high frequency noise.
In this embodiment, collection system 4 includes fixed bolster 41 and microphone 42, the top fixed mounting of fixed bolster 41 falls the inner wall of the tuber pipe 3 of making an uproar at the inner wall of falling, microphone 42 fixed mounting is in the bottom of fixed bolster 41, and microphone 42 is located the center axis of falling the tuber pipe 3 of making an uproar, noise signal collection efficiency and stability can be improved, can obtain the more superior initiative performance of making an uproar, it needs to explain here, the top of fixed bolster 41 can with fall the lateral wall threaded connection of the tuber pipe 3 of making an uproar, if microphone 42 and multichannel initiative fall the controller 7 of making an uproar and adopt wired electricity to be connected, then fixed bolster 41 is inside to leave the required passageway of interlude circuit line.
In this embodiment, emitter 5 includes speaker 51, box base 52 and box upper cover 53, the installing port has been seted up to the lateral wall of the tuber pipe of making an uproar 3, speaker 51 fixed mounting is inside box base 52, speaker 51 is used for launching the sound wave opposite with the noise signal phase place, the frequency is the same, box base 52 fixed mounting is in the outer wall installing port department of the tuber pipe of making an uproar 3 that falls, and speaker 51's cone is just to the installing port, the sound wave of making an uproar that falls that enables speaker 51 transmission passes through the inside that the installing port got into the tuber pipe of making an uproar 3 that falls, box upper cover 53 is installed on box base 52 and is closed with box base 52 lid, it needs to explain here, if speaker 51 and multichannel initiative noise reduction controller 7 adopt wired electricity to be connected, then box upper cover 53 leaves.
In this embodiment, the multichannel active noise reduction controller 7 is fixedly installed inside the control box 9 of the fresh air device 1, it should be noted herein that the fresh air device 1 and the control box 9 are both in the prior art, the control box 9 includes a control circuit of the fresh air device 1, and specific structures of the fresh air device 1 and the control box 9 are not repeated herein, and the multichannel active noise reduction controller 7 is a device in the prior art or can be manufactured by the prior art, such as a central processing unit disclosed in CN201820956799.5, an active noise reduction system and method disclosed in CN105025419B, an active noise reduction controller disclosed in CN203840513U, and an active noise reduction system developed and produced by high technology thereof.
The working principle of the embodiment is as follows: when the emitting device 5 is assembled, the loudspeaker 51 is fixedly arranged inside the box body base 52, then the box body base 52 is fixedly arranged at the mounting opening on the outer side wall of the noise reduction air pipe 3, and finally the box body upper cover 53 is arranged on the box body base 52 and is covered with the box body base 52; after each noise reduction module is assembled, four noise reduction air pipes 3 are respectively connected between the flange 2 and the user air pipe, and the acquisition device 4 and the transmitting device 5 of each noise reduction module are respectively and electrically connected with a multi-channel active noise reduction controller 7; when the fresh air equipment 1 is operated, noise generated by the fresh air equipment 1 is transmitted outwards through the air pipes of users, the noise is firstly picked up by the microphone 42 close to one end of the flange 2, the microphone 42 converts sound pressure signals into electric signals and transmits the electric signals to the multi-channel active noise reduction controller 7, the multi-channel active noise reduction controller 7 simultaneously receives the electric signals transmitted by the microphone 42 corresponding to each noise reduction module, the electric signals are simultaneously transmitted to the loudspeakers 51 in a one-to-one correspondence manner after data synthesis and processing calculation, the electric signals transmitted by the multi-channel active noise reduction controller 7 are respectively converted into noise reduction waves after the loudspeakers 51 respectively receive the electric signals transmitted by the multi-channel active noise reduction controller 7, noise reduction sound waves transmitted by the loudspeakers 51 enter the noise reduction air pipes 3 through the corresponding mounting ports, and the multi-channel active noise reduction controller 7 can obtain the strength according to the noise signals received by each, the noise reduction signal that can match and offset noise signal is sent to corresponding emitter 5 respectively, can avoid the sound field mutual interference between a plurality of noise reduction modules, when the noise sent from new trend equipment 1 and propagated along falling the tuber pipe 3 of making an uproar, some high frequency noise is absorbed by the cotton layer of inhaling of the 3 inner walls installation of each noise reduction tuber pipe, the sound wave of making an uproar is superimposed at the exit end of falling the tuber pipe 3 of making an uproar to another part noise and speaker 51 transmission, and produce destructive interference, thereby most well low frequency noise can be fallen "absorption" by the initiative, the process of making an uproar takes place at every noise reduction module department, consequently can reduce new trend equipment 1 noise outwards propagation through this kind of mode by a wide margin.
In the specification of the present invention, a large number of specific details are explained. It is understood, however, that the practice of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.
Claims (7)
1. The utility model provides a device of making an uproar falls in broadband for new trend equipment, new trend equipment (1) is equipped with a plurality of wind gaps that are used for the air inlet and exhaust, its characterized in that: comprises a plurality of noise reduction modules;
the noise reduction modules are correspondingly arranged at a plurality of air inlets of the fresh air equipment (1) one by one, and each noise reduction module comprises a noise reduction air pipe (3), an acquisition device (4) and a transmitting device (5); one end of the noise reduction air pipe (3) is communicated with the air port, and the inner wall of the noise reduction air pipe (3) is fixedly provided with a sound absorption material layer (6); the collecting device (4) is arranged inside the noise reduction air pipe (3) and close to one side of the air port and is used for acquiring a noise signal; the transmitting device (5) is arranged on the side wall of the noise reduction air pipe (3) and far away from one side of the air port and is used for transmitting noise reduction sound waves into the noise reduction air pipe (3);
the noise reduction device is characterized by further comprising a multi-channel active noise reduction controller (7), wherein the acquisition devices (4) and the transmitting devices (5) of each noise reduction module are respectively and electrically connected with the multi-channel active noise reduction controller (7), and the multi-channel active noise reduction controller (7) is used for simultaneously receiving and processing noise signals acquired by the acquisition devices (4) and simultaneously sending the noise signals to the transmitting devices (5) in a one-to-one correspondence manner.
2. The broadband noise reduction device for fresh air equipment according to claim 1, wherein: every wind gap department all is equipped with flange (2) of being convenient for connect the tuber pipe (3) of making an uproar, the one end and the flange (2) fixed connection of tuber pipe (3) of making an uproar fall.
3. The broadband noise reduction device for fresh air equipment according to claim 1 or 2, wherein: the sound absorbing material layer (6) is a sound absorbing cotton layer which is fixed on the inner wall of the noise reduction air pipe (3).
4. The broadband noise reduction device for fresh air equipment according to claim 1 or 2, wherein: collection system (4) are including fixed bolster (41) and microphone (42), and the top fixed mounting of fixed bolster (41) falls the inner wall of wind pipe (3) of making an uproar, and microphone (42) fixed mounting is in the bottom of fixed bolster (41), and microphone (42) are located the central axis of falling the wind pipe (3) of making an uproar.
5. The broadband noise reduction device for fresh air equipment according to claim 1 or 2, wherein: emitter (5) include speaker (51), box base (52) and box upper cover (53), the installing port has been seted up to the lateral wall of falling the tuber pipe of making an uproar (3), speaker (51) fixed mounting is inside box base (52), speaker (51) are used for launching with noise signal opposite phase, the same sound wave of frequency, box base (52) fixed mounting falls tuber pipe (3) outside wall mounting mouth department of making an uproar, and the cone of speaker (51) is just to the installing port, box upper cover (53) are installed on box base (52) and are closed with box base (52) lid.
6. The broadband noise reduction device for fresh air equipment according to claim 1 or 2, wherein: the multichannel active noise reduction controller (7) is fixedly installed inside a control box (9) of the fresh air equipment (1).
7. The broadband noise reduction device for fresh air equipment according to claim 1, wherein: the fresh air equipment is provided with four air ports which are respectively an outdoor air inlet port, an outdoor air exhaust port, an indoor air inlet port and an indoor air exhaust port, the noise reduction modules are four, the four noise reduction modules are respectively an outdoor air inlet noise reduction module (81), an outdoor air exhaust noise reduction module (82), an indoor air inlet noise reduction module (83) and an indoor air exhaust noise reduction module (84), and the four noise reduction modules are respectively and correspondingly installed at the four air ports.
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| CN201921573446.8U CN210624871U (en) | 2019-09-20 | 2019-09-20 | Broadband noise reduction device for fresh air equipment |
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| CN201921573446.8U CN210624871U (en) | 2019-09-20 | 2019-09-20 | Broadband noise reduction device for fresh air equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111765619A (en) * | 2020-07-03 | 2020-10-13 | 深圳市旷世伟业工程有限公司 | Central air conditioner noise reduction structure and method thereof |
| CN112484289A (en) * | 2020-11-20 | 2021-03-12 | 珠海格力电器股份有限公司 | Noise reduction device, fresh air fan and noise reduction method |
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2019
- 2019-09-20 CN CN201921573446.8U patent/CN210624871U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111765619A (en) * | 2020-07-03 | 2020-10-13 | 深圳市旷世伟业工程有限公司 | Central air conditioner noise reduction structure and method thereof |
| CN112484289A (en) * | 2020-11-20 | 2021-03-12 | 珠海格力电器股份有限公司 | Noise reduction device, fresh air fan and noise reduction method |
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