CN210984264U - General active noise reduction silencer - Google Patents

Abstract

The utility model provides a silencer of making an uproar falls in general initiative, including casing, collection system, emitter and the controller of making an uproar falls in the initiative, the casing both ends are equipped with air inlet and gas outlet respectively, the casing inside wall is equipped with sound absorbing material layer, sound absorbing material layer inside wall is equipped with the perforated plate, collection system installs in the perforated plate inboard and be close to air inlet one end, be used for acquireing noise signal, emitter installs between casing inside wall and perforated plate and be close to gas outlet one end, be used for to the casing internal transmission sound wave of making an uproar falls, collection system and emitter are equallyd divide do not to fall with the controller electricity of making an uproar is connected with the initiative, the controller of making an. The utility model discloses a silencer can increase the ventilation runner cross-section, reduce the flow resistance, improves the operating efficiency, falls passively and falls the technique of making an uproar and realize that the advantage is complementary with the initiative, increases substantially silencer noise reduction, and the bandwidth of making an uproar, application scope are fallen in the extension extensively.

Description

General active noise reduction silencer

Technical Field

The utility model belongs to the technical field of noise control, concretely relates to general silencer of making an uproar falls in initiative.

Background

Conventional mufflers include resistive mufflers, reactive mufflers, and hybrid mufflers, which are implemented by sound absorbing materials or resonant sound absorbing structures.

Patent document Z L201520343949.1 discloses an active noise reduction composite muffler applied to a nuclear power station, which has the technical core idea that the waveform phase is adjusted by changing the length of a gas pipe, so that a fixed phase difference exists between sound waves in a gas inlet pipe and sound waves in a gas outlet pipe, and the purpose of noise reduction is achieved after two rows of sound waves are superposed.

①, the traditional resistive muffler needs to lengthen a pipeline, increase the number of noise reduction sheets and reduce the equivalent diameter of a pipe opening to obtain larger noise reduction amount, ②, the reactive muffler has better low-frequency characteristic but utilizes the resonance sound absorption principle, so the silencer has better noise reduction characteristic only near the resonance frequency, has narrower bandwidth, is limited by the expansion ratio, and has larger expansion ratio when needing larger noise reduction amount, so the silencer has huge appearance size and lower space utilization rate, ③, the composite muffler combining the resistive muffler and the reactive muffler is better than the single resistive muffler and the reactive muffler in terms of bandwidth and noise reduction amount, but the muffler is generally formed by connecting a plurality of sections in series to increase the flow resistance and the length size, ④, the active noise reduction method disclosed by patent document Z L201520343949.1 can realize noise reduction, but the realization method is very similar to resonance, and the application of a sound source in single-frequency application can realize the increase of the length of a sound source air pipe, so that the noise reduction method can not realize the noise reduction by using a wide-frequency sound source air pipe, and can not realize the noise reduction by using a self-reducing material with different noise reduction characteristics (the noise reduction characteristics, and the noise reduction material can not be easily adapted to the noise reduction material once the noise reduction material has the problem of the noise reduction material.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model provides a silencer of making an uproar falls in general initiative.

The utility model discloses a following technical scheme realizes:

a general active noise reduction silencer comprises a shell, wherein an air inlet and an air outlet are respectively arranged at two ends of the shell, when the silencer is installed, the air inlet is communicated with an air port of a ventilation device, the air outlet is communicated with a gas transmission pipeline, a sound absorption material layer is fixedly arranged on the inner side wall of the shell and can absorb most of high-frequency noise, and the length and the shape of the shell can be adjusted according to the space requirement, the noise reduction requirement and the noise spectrum characteristic in practical application, the shell can be made into a cylindrical shape, a square shape and the like, and the thickness and the type of the sound absorption material layer can be selected and adjusted according to the spectrum characteristic and the environmental protection requirement of the practical noise; the inner side wall of the sound-absorbing material layer is provided with a perforated plate, specifically, the perforated plate is made of a galvanized plate, a plurality of through holes penetrating through two side faces are formed in the galvanized plate, noise can enter the sound-absorbing material layer through the perforated plate, and the perforated plate can protect and fix the sound-absorbing material layer;

the device comprises a perforated plate, a shell, a wind-proof device, an active noise reduction controller and a control device, wherein the perforated plate is provided with a central axis, the shell is provided with a central axis, the central axis is arranged on the inner side of the central axis, the active noise reduction controller is arranged on the inner side of the perforated plate, the central axis is arranged on the inner side of the shell, the active noise reduction controller is arranged on the outer side of the perforated plate, the wind-proof device is arranged on the inner side of the perforated; the transmitting device is arranged between the inner side wall of the shell and the perforated plate and close to one end of the air outlet and is used for transmitting noise reduction sound waves into the shell, and the mounting position of the transmitting device can be selected and adjusted according to the characteristics of noise and a flow field; the 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 in high technology thereof;

when the silencer is arranged at the air port connected with the ventilation equipment, the noise generated by the ventilation equipment enters the shell through the air port, and spread along the interior of the shell, the sound pressure signal is converted into an electric signal by the collecting device and transmitted to the active noise reduction controller, the active noise reduction controller receives and processes the noise signal, then the noise reduction signal is sent to the transmitting device, the transmitting device converts the electric signal into noise reduction sound waves, the noise reduction sound waves penetrate through the perforated plate and enter a central flow passage in the shell, when noise is sent from the ventilation equipment and propagates along the interior of the shell, one part of high-frequency noise is absorbed by a sound absorption material layer arranged in the shell, the other part of noise and the noise reduction sound waves transmitted by the transmitting device are superposed at one end of an air outlet of the shell, because two rows of noise have the same frequency and opposite phases, destructive interference is generated, and most of the middle and low frequency noise is actively reduced and absorbed; the silencer increases the section of a ventilation flow channel, reduces flow resistance, effectively improves the operation efficiency, reduces low-frequency and medium-frequency noise by using an active noise reduction technology, breaks through the difficulty in absorbing low frequency of the sound absorbing material of the traditional resistive silencer, and can be adjusted in real time according to the actual noise volume and the spectrum characteristics by using an active noise reduction system consisting of the acquisition device, the active noise reduction controller and the transmitting device, so that the silencer can obtain better noise reduction effect in different application occasions and has self-adaptability.

Further inject, air inlet and air outlet all are fixed to be equipped with the flange on the casing, are convenient for this silencer erection joint to in the pipeline.

Further inject, inhale the cotton layer of sound material for inhaling the cotton layer of sound, inhale the cotton layer of sound and can absorb most high frequency noise.

Further inject, collection system includes fixed bolster and microphone, and the bottom fixed mounting of fixed bolster is at the inside wall of perforated plate, and microphone fixed mounting is on the top of fixed bolster, and the microphone is located the inside central axis of casing, can improve noise signal collection efficiency and stability, can obtain the more superior initiative and fall the performance of making an uproar.

Further inject, emitter includes box and speaker, the box install between casing inside wall and perforated plate and with casing inside wall fixed connection, be close to perforated plate one side on the box and be equipped with the opening, speaker fixed mounting is in the box, and the cone of speaker just to the opening, is equipped with a plurality of bee holes with the corresponding department of cone on the perforated plate, and the sound wave of making an uproar of falling that the speaker of being convenient for sent pierces through the perforated plate from a plurality of bee holes and gets into the inside center runner of casing.

Further, the active noise reduction controller is fixedly arranged in the box body, so that batch production is facilitated.

According to the above technical scheme, the utility model provides a pair of general silencer of making an uproar falls in initiative, beneficial effect lies in:

①, compared with the traditional resistance muffler, the muffler has the advantages that the muffler is not internally provided with the muffling sheet, the section of the ventilation flow channel is increased, the flow resistance is reduced, and the operation efficiency is effectively improved;

②, the active noise reduction technology is used for reducing the middle and low frequency noise, and the obstacle that the traditional resistive muffler sound absorption material is difficult to absorb at low frequency is broken through;

③, the silencer improves the medium and low frequency characteristics by using the active noise reduction technology, and replaces the traditional resonance sound absorption structure, thereby enabling the silencer to be smaller in size and increasing the volume utilization rate;

④, an active noise reduction system composed of the acquisition device, the active noise reduction controller and the emission device is utilized to make the silencer real-time adjustable according to the actual noise volume and the spectrum characteristics, thereby ensuring that the silencer can obtain better noise reduction effect in different application occasions and has self-adaptability;

⑤ the silencer can be used in ventilation equipment such as fresh air equipment and central air conditioner.

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 perspective view of the present invention.

Fig. 2 is a front view of the present invention.

Fig. 3 is a right side view of the present invention.

Fig. 4 is a sectional view taken along a-a in fig. 2.

Fig. 5 is a sectional view taken along the line B-B in fig. 3.

In the drawings: 1-shell, 2-air inlet, 3-air outlet, 4-sound-absorbing material layer, 5-perforated plate, 6-collecting device, 61-fixed support, 62-microphone, 7-transmitting device, 71-box, 72-loudspeaker, 8-active noise reduction controller, and 9-flange.

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 5, a general active noise reduction muffler includes a housing 1, a collecting device 6, an emitting device 7, and an active noise reduction controller 8;

the silencer is characterized in that an air inlet 2 and an air outlet 3 are respectively arranged at two ends of the shell 1, when the silencer is installed, the air inlet 2 is communicated with an air port of ventilation equipment, the air outlet 3 is communicated with a gas transmission pipeline, a sound absorption material layer 4 is fixedly arranged on the inner side wall of the shell 1, and the sound absorption material layer 4 can absorb most of high-frequency noise; the inner side wall of the sound-absorbing material layer 4 is provided with a perforated plate 5, specifically, the perforated plate 5 is made of a galvanized plate, a plurality of through holes penetrating through two side faces are formed in the galvanized plate, noise can enter the sound-absorbing material layer 4 through the perforated plate 5, and the perforated plate 5 can protect and fix the sound-absorbing material layer 4;

the collecting device 6 is mounted on the inner side of the perforated plate 5 and close to one end of the air inlet 2, and is used for acquiring a noise signal, wherein it needs to be described that one side close to the central axis inside the shell 1 is the inner side; the transmitting device 7 is arranged between the inner side wall of the shell 1 and the perforated plate 5 and close to one end of the air outlet 3 and is used for transmitting noise reduction sound waves into the shell 1; the acquisition device 6 and the transmitting device 7 are respectively electrically connected with an active noise reduction controller 8, the electrical connection can be wired electrical connection or wireless electrical connection, and the active noise reduction controller 8 is used for receiving and processing noise signals acquired by the acquisition device 6 and transmitting the noise reduction signals to the transmitting device 7;

the silencer increases the section of a ventilation flow channel, reduces flow resistance, effectively improves the operation efficiency, reduces low-frequency and medium-frequency noise by using an active noise reduction technology, breaks through the difficulty in absorbing low frequency of the sound absorbing material of the traditional resistive silencer, and can be adjusted in real time according to the actual noise volume and the spectrum characteristics by using an active noise reduction system consisting of the acquisition device 6, the active noise reduction controller 8 and the transmitting device 7, so that the silencer can obtain a better noise reduction effect in different application occasions and has self-adaptability.

In this embodiment, the inlet 2 and the outlet 3 on the casing 1 are both fixedly provided with flanges 9, which is convenient for the muffler to be installed and connected to the pipeline.

In this embodiment, the sound-absorbing material layer 4 is a sound-absorbing cotton layer, and the sound-absorbing cotton layer can absorb most of high-frequency noise.

In this embodiment, the collecting device 6 includes a fixed support 61 and a microphone 62, the bottom end of the fixed support 61 is fixedly mounted on the inner side wall of the perforated plate 5, the microphone 62 is fixedly mounted on the top end of the fixed support 61, and the microphone 62 is located on the central axis inside the casing 1, so that the noise signal collecting efficiency and stability can be improved, and the superior active noise reduction performance can be obtained.

In this embodiment, emitter 7 includes box 71 and speaker 72, box 71 install between casing 1 inside wall and perforated plate 5 and with casing 1 inside wall fixed connection, be close to perforated plate 5 one side on the box 71 and be equipped with the opening, speaker 72 fixed mounting is in box 71, and speaker 72's cone just to the opening, is equipped with a plurality of bee holes with the corresponding department of cone on the perforated plate 5, and the sound wave of making an uproar falls that is convenient for speaker 72 to send pierces through perforated plate 5 from a plurality of bee holes and gets into the inside center runner of casing 1.

In this embodiment, controller 8 of making an uproar falls in initiative is fixed mounting in box 71, the mass production of being convenient for, it needs to explain here that, the bottom of fixed bolster 61 can with perforated plate 5 threaded connection, if microphone 62 and controller 8 of making an uproar fall in the initiative adopt wired electricity to connect, then the inside required passageway of circuit line that leaves of fixed bolster 61 alternates, leaves the required hole of circuit line that alternates on the box 71.

The working principle of the embodiment is as follows: the silencer is installed and connected at an air port of the ventilation equipment, when the ventilation equipment runs, noise generated by the ventilation equipment enters the shell 1 through the air port and is transmitted along a central flow passage in the shell 1, the noise is firstly picked up by the microphone 62 close to one end of the air inlet of the shell 1, the microphone 62 converts sound pressure signals into electric signals and transmits the electric signals to the active noise reduction controller 8, the active noise reduction controller 8 receives and processes the noise signals and then transmits the noise reduction signals to the loudspeaker 72, the loudspeaker 72 converts the electric signals into noise reduction sound waves, the noise reduction sound waves pass through the perforated plate 5 and enter the central flow passage in the shell 1, the active noise reduction controller 8 can send noise reduction signals capable of matching and offsetting the noise signals to the loudspeaker 72 according to the strength of the noise signals received by the microphone 62, when the noise is sent from the ventilation equipment and is transmitted along the interior of the shell 1, part of high-, the other part of low-frequency noise is superposed with the noise reduction sound wave emitted by the loudspeaker 72 at one end of the air outlet 3 of the shell 1, and because the two rows of noise have the same frequency and opposite phases, destructive interference can be generated, so that most of the low-frequency noise in the middle and the low-frequency noise can be actively reduced and absorbed, and the outward transmission of the noise generated by the ventilation equipment can be greatly reduced through the silencer.

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 (6)

1. A general active noise reduction muffler is characterized in that: the sound absorption device comprises a shell (1), wherein an air inlet (2) and an air outlet (3) are respectively arranged at two ends of the shell (1), a sound absorption material layer (4) is fixedly arranged on the inner side wall of the shell (1), a perforated plate (5) is arranged on the inner side wall of the sound absorption material layer (4), and the perforated plate (5) is used for protecting and fixing the sound absorption material layer (4);

still include collection system (6), emitter (7) and initiatively fall controller (8) of making an uproar, collection system (6) are installed in perforated plate (5) inboard and are close to air inlet (2) one end for acquire the noise signal, emitter (7) are installed between casing (1) inside wall and perforated plate (5) and are close to gas outlet (3) one end for to the casing (1) internal transmission fall the sound wave of making an uproar, collection system (6) and emitter (7) are equallyd divide and are do not fallen controller (8) electricity with the initiative and are connected, and controller (8) of making an uproar is used for receiving and handling the noise signal that collection system (6) acquireed and will fall the signal transmission of making an uproar and will fall and send to emitter (7).

2. A universal active noise reduction muffler according to claim 1 wherein: and flanges (9) are fixedly arranged at the air inlet (2) and the air outlet (3) on the shell (1).

3. A universal active noise reduction muffler according to claim 1 wherein: the sound-absorbing material layer (4) is a sound-absorbing cotton layer.

4. A universal active noise reduction muffler according to claim 1 wherein: collection system (6) are including fixed bolster (61) and microphone (62), and the bottom fixed mounting of fixed bolster (61) is at the inside wall of perforated plate (5), and microphone (62) fixed mounting is on the top of fixed bolster (61), and microphone (62) are located the inside central axis of casing (1).

5. A universal active noise reduction muffler according to claim 1 wherein: emitter (7) include box (71) and speaker (72), box (71) install between casing (1) inside wall and perforated plate (5) and with casing (1) inside wall fixed connection, be close to perforated plate (5) one side on box (71) and be equipped with the opening, speaker (72) fixed mounting is in box (71), and the cone of speaker (72) is just to the opening, be equipped with a plurality of bee holes with the corresponding department of cone on perforated plate (5).

6. A universal active noise reduction muffler according to claim 1 wherein: the active noise reduction controller (8) is fixedly arranged in the box body (71).

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