CN212615633U

CN212615633U - Silencer and silencing device

Info

Publication number: CN212615633U
Application number: CN202020883934.5U
Authority: CN
Inventors: 邬锋华; 谭剑辉
Original assignee: Dongguan Viper Cleaning Equipment Co Ltd
Current assignee: Dongguan Viper Cleaning Equipment Co Ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2021-02-26
Anticipated expiration: 2030-05-22

Abstract

The utility model belongs to the technical field of the silencing equipment technique and specifically relates to indicate a muffler, including last cavity, lower cavity and apron, go up the cavity and be equipped with the aviation baffle, first fresh air inlet and cavity, go up the aviation baffle and be circular-arc or heliciform and lie in the cavity, go up the aviation baffle and enclose with the cavity and establish into circular-arc or heliciform upper noise channel, upper noise channel's head end is equipped with the last air inlet, first air intake has been seted up to the top surface of lower cavity, the bottom of lower cavity is equipped with circuitous lower noise channel, lower noise channel's tail end is equipped with first air outlet. The utility model prolongs the path stroke of the airflow, the noise generated by the airflow can be lost or offset due to turning interference and the like in the flowing process, and the flow velocity of the airflow is reduced, thereby achieving the purposes of noise reduction and noise reduction; still provide a silencing device with muffler, its induced draft produced air current separates with the heat dissipation air current, has reduced the noise that the air current disturbed the production, has guaranteed the radiating effect.

Description

Silencer and silencing device

Technical Field

The utility model belongs to the technical field of the silencing equipment technique and specifically relates to indicate a muffler and silencing device.

Background

At present, although different structures of silencers exist, the defects of complex structure, poor manufacturing manufacturability and high cost generally exist, and in addition, the existing silencers have the defect of poor silencing effect because the inherent defect exists in the structure, and the damping space and the diffusion space through which airflow passes in an effective space are generally limited. Therefore, the drawbacks are obvious, and a solution is needed.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, an object of the present invention is to provide a silencer and a silencer, which has a simple structure and a low cost, and can greatly prolong the path stroke of the air flow flowing through the upper air duct, the upper silencing passage and the lower silencing passage in turn, and the noise generated by the air flow can be lost or offset due to turning interference in the flowing process, thereby achieving the silencing and noise reduction effects; the air flow generated by air suction is separated from the heat dissipation air flow, so that the noise generated by air flow interference is reduced, and the heat dissipation effect is ensured.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a silencer comprises an upper cavity, a lower cavity connected to the bottom of the upper cavity and a cover plate connected to the lower cavity, wherein the cover plate is used for covering the bottom of the lower cavity, the upper cavity is provided with an upper air deflector, a first air inlet and a cavity, the first air inlet is communicated with the top of the cavity, the upper air deflector is arc-shaped or spiral and is located in the cavity, an upper silencing channel which is arc-shaped or spiral is enclosed by the upper air deflector and the cavity, an upper air inlet is formed in the head end of the upper silencing channel, a first lower air inlet is formed in the top surface of the lower cavity, a circuitous lower silencing channel is arranged at the bottom of the lower cavity, the first lower air inlet is used for communicating the tail end of the upper silencing channel and the head end of the lower silencing channel, and a first lower air outlet is formed in the tail end of the lower silencing.

Further, a first sealing ring is arranged between the bottom of the upper cavity and the top surface of the lower cavity and used for sealing a gap between the upper cavity and the lower cavity, and a first through hole communicated with the first lower air inlet is formed in the first sealing ring.

Further, the middle part of cavity is provided with the installation core down, the bottom of installation core is located the central point that the noise elimination passageway put down, the lateral wall of installation core encloses with the inside wall of noise elimination passageway down and establishes into the heat dissipation passageway that has air outlet under the second, the middle part of installation core is concave to be equipped with the installation cavity, the louvre with heat dissipation passageway intercommunication is seted up to the lateral wall of installation cavity, the diapire of installation cavity is provided with air intake under the second, the apron is provided with the second fresh air inlet with air intake intercommunication under the second.

Further, the second lower air inlet is provided with a filter element, a first sealing ring is arranged between the filter element and the installation cavity, and the first sealing ring is used for sealing a gap between the filter element and the installation cavity.

Further, a second sealing ring is arranged between the cover plate and the bottom of the lower cavity and used for sealing a gap between the cover plate and the lower cavity, and a second through hole communicated with the second air inlet hole is formed in the second sealing ring.

The utility model also provides an silencing device, including suction motor and foretell muffler, the end that induced drafts of suction motor suddenly extends to the cavity and is located the central point that the sound channel was put on, and the end that induced drafts of suction motor encloses with the inside wall of last sound channel and establishes into the wind channel, go up the last air inlet intercommunication of wind channel and last sound channel, the heat dissipation end of suction motor suddenly extends to the installation intracavity, and the heat dissipation end of suction motor encloses with the inside wall of installation cavity and establishes into down the wind channel, wind channel and louvre intercommunication down, the import and the first fresh air inlet intercommunication of induced drafting of the end that induced drafts of suction motor, the heat dissipation import and the second of the heat dissipation end of suction motor are air intake intercommunication down.

Furthermore, the top of the installation core protrudes into the cavity, a positioning ring is arranged in the middle of the cavity and is located at the center of the upper air deflector, the top of the installation core abuts against the bottom face of the air suction end of the suction motor, and the positioning ring is used for positioning the air suction end of the suction motor.

Furthermore, a second sealing ring is arranged between the air suction end of the suction motor and the positioning ring, and a second sealing ring is arranged between the bottom surface of the air suction end of the suction motor and the mounting core.

Furthermore, the heat dissipation end of the suction motor is convexly provided with a limiting portion, and the inner side wall of the installation cavity is concavely provided with a limiting groove for accommodating the limiting portion.

The utility model also provides a silencing device, including aspirator and foretell muffler, the aspirator is located the cavity, the convulsions import and the first fresh air inlet intercommunication of aspirator, the lateral wall of aspirator and the inside wall of last sound channel enclose and establish into the wind channel, the last wind inlet of last sound channel and the convulsions export of aspirator all communicate with last wind channel.

The utility model has the advantages that: the utility model has the advantages of simple and compact structure, reasonable design, and low cost, through with the air current in proper order at upper air duct, go up the sound channel and the interior rotation flow of sound channel that disappears down, prolonged the route stroke that the air current flows greatly, the air current can be because of loss such as turn interference or offset in the process of flowing to reach the effect of amortization noise reduction, the noise reduction effect is obvious, and the flow of air current is stable, has prevented the indiscriminate noise of extra wadding from producing, has reduced the velocity of flow of air current, has reached the purpose of amortization noise reduction; the air flow generated by air suction is separated from the heat dissipation air flow, so that the noise generated by air flow interference is reduced, and the heat dissipation effect is ensured.

Drawings

Fig. 1 is a schematic perspective view of the silencer of the present invention.

Fig. 2 is a schematic perspective view of another viewing angle of the silencer according to the present invention.

Fig. 3 is a schematic view of an exploded structure of the silencer according to the present invention.

Fig. 4 is an exploded view of another perspective of the silencer of the present invention.

Fig. 5 is a schematic perspective view of the upper chamber of the present invention.

Fig. 6 is a schematic perspective view of the lower chamber of the present invention.

Fig. 7 is a schematic perspective view of another perspective view of the lower chamber according to the present invention.

Description of reference numerals:

1. an upper chamber; 11. an upper air deflector; 12. a first air inlet hole; 13. a cavity; 14. an upper vent channel; 15. an upper inlet; 16. a second seal ring; 17. a positioning ring; 2. a lower chamber; 20. a limiting groove; 21. a first lower air inlet; 22. a lower muffling channel; 23. a first lower air outlet; 24. installing a core; 25. a second lower air outlet; 26. a heat dissipation channel; 27. a mounting cavity; 28. heat dissipation holes; 29. a second lower air inlet; 3. a cover plate; 31. locking lugs; 32. a second air inlet hole; 33. a filter element; 34. a first seal ring; 35. a second seal ring; 4. a first seal ring; 41. a first through hole; 42. a positioning column; 43. positioning holes; 44. positioning a groove; 45. a second through hole; 5. a suction motor; 51. an air suction end; 53. an air suction inlet; 54. an air suction outlet; 55. a heat dissipation end; 57. a heat dissipation inlet; 58. a heat dissipation outlet; 59. a limiting part.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

As shown in fig. 1 to 7, the utility model provides a silencer, which comprises an upper chamber 1, a lower chamber 2 connected to the bottom of the upper chamber 1, and a cover plate 3 connected to the lower chamber 2, wherein the cover plate 3 is used for covering the bottom of the lower chamber 2, the upper chamber 1 is provided with an upper air deflector 11, a first air inlet 12 and a cavity 13, the first air inlet 12 is coaxially arranged with the cavity 13, the first air inlet 12 is communicated with the top of the cavity 13, the upper air deflector 11 is arc-shaped or spiral and is located in the cavity 13, the upper air deflector 11 and the cavity 13 enclose an upper silencing channel 14 which is arc-shaped or spiral, the head end of the upper silencing channel 14 is provided with an upper air inlet 15, the top surface of the lower chamber 2 is provided with a first lower air inlet 21, the bottom of the lower chamber 2 is provided with a circuitous lower silencing channel 22, the first lower air inlet 21 is used for communicating the tail end of the upper silencing channel 14 with the head end of the lower silencing channel 22, and a first lower air outlet 23 is arranged at the tail end of the lower silencing channel 22. In this embodiment, it is described that the suction motor 5 is installed in the cavity 13, the suction inlet 53 of the suction motor 5 is communicated with the first air inlet 12, the suction end 51 of the suction motor 5 and the inner side wall of the upper sound channel 14 are enclosed to form an upper air duct, the upper air inlet 15 and the suction outlet 54 of the suction motor 5 are both communicated with the upper air duct, and the upper sound channel 14 is a one-turn or multi-turn air flow channel.

In actual operation, the air suction inlet 53 of the suction motor 5 sucks air into the external structure through the first air inlet hole 12, so that the external structure is in a vacuum state, the air suction outlet 54 of the suction motor 5 discharges air into the upper air duct, the air flows along the path of the upper air duct in a rotating manner, when the air flows to the upper air inlet 15, the air flows into the upper silencing channel 14 through the upper air inlet 15, so that the air flows along the path of the upper silencing channel 14 in a rotating manner, and when the air flows to the tail end of the upper silencing channel 14, the air flows to the lower silencing channel 22 through the first lower air inlet 21, so that the air flows circuitously along the path of the lower silencing channel 22 until the air flows out of the first lower air outlet 23. The utility model has the advantages of simple structure and compactness, reasonable in design, manufacturing process is good, and is low in cost, through with the air current in proper order at last wind channel, go up sound channel 14 and the interior rotation flow of lower sound channel 22, make the air current from inside to outside rotatory flow, then from the top down flow, the outside to inside rotatory flow at last, the route stroke that the air current flows has been prolonged greatly, the air current can interfere the isoloss or offset because of the turn at the in-process that flows, thereby reach the effect that the amortization was fallen and the noise was fallen, the noise cancelling effect is obvious, and the flow of air current is stable, the indiscriminate noise of extra wadding has been prevented and has been produced, the velocity of flow of air. The utility model discloses be particularly suitable for applying to in the floor cleaning machine.

Specifically, go up cavity 1 and lower cavity 2 and all can adopt sound absorbing material to make, further improved the utility model discloses an effect of noise reduction.

Specifically, apron 3 is connected with the bottom detachably of lower cavity 2, the circumference of apron 3 is provided with a plurality of lock ears 31, through setting up lock ears 31, is convenient for with the utility model discloses locking is installed externally structurally.

In this embodiment, a first sealing ring 4 is disposed between the bottom of the upper chamber 1 and the top surface of the lower chamber 2, the first sealing ring 4 is used to seal a gap between the upper chamber 1 and the lower chamber 2, the first sealing ring 4 is provided with a first through hole 41 communicated with the first lower air inlet 21, and the first through hole 41 is disposed corresponding to the first lower air inlet 21. The gap between the upper chamber 1 and the lower chamber 2 is sealed by adding the first sealing ring 4, so that noise caused by air flow leakage in the upper sound absorbing channel 14 can be avoided, and the air tightness between the upper chamber 1 and the lower chamber 2 is improved.

Specifically, the upper chamber 1 and the lower chamber 2 may be fixedly connected by screws, or may be connected by fastening, covering, or screwing.

Specifically, the top surface of the lower chamber 2 is provided with a positioning column 42, the first seal ring 4 is provided with a positioning hole 43, the positioning column 42 penetrates through the positioning hole 43, and the positioning column 42 is matched with the positioning hole 43 to position the first seal ring 4, so that the first seal ring 4 is convenient to mount, the position accuracy and stability of the first seal ring 4 are improved, and the phenomenon of air leakage caused by the deviation of the first seal ring 4 is avoided; the concave constant head tank 44 that is equipped with of top surface of cavity 2 down, first sealing washer 4 holds and locates in constant head tank 44 for go up the compact structure between cavity 1, first sealing washer 4 and the lower cavity 2, the inner wall of constant head tank 44 is contradicted spacingly to the lateral wall of first sealing washer 4, has further improved first sealing washer 4's stability, and has avoided going up cavity 1 and lower cavity 2 and extrude first sealing washer 4 and make first sealing washer 4 warp inefficacy, guarantees to go up the gas tightness between cavity 1 and the lower cavity 2.

In this embodiment, the middle of the lower chamber 2 is provided with an installation core 24, the bottom of the installation core 24 is located at the center of the lower muffling channel 22, the outer side wall of the installation core 24 and the inner side wall of the lower muffling channel 22 are surrounded to form a heat dissipation channel 26 with a second lower air outlet 25, the middle of the installation core 24 is concavely provided with an installation cavity 27, the side wall of the installation cavity 27 is provided with a heat dissipation hole 28 communicated with the heat dissipation channel 26, the bottom wall of the installation cavity 27 is provided with a second lower air inlet 29, and the cover plate 3 is provided with a second air inlet 32 communicated with the second lower air inlet 29; the suction end 51 of the suction motor 5 protrudes into the cavity 13 and is located at the center of the upper sound-absorbing channel 14, the suction end 51 of the suction motor 5 and the inner side wall of the upper sound-absorbing channel 14 are surrounded to form an upper air duct, the upper air duct is communicated with the upper air inlet 15 of the upper sound-absorbing channel 14, the heat dissipation end 55 of the suction motor 5 protrudes into the installation cavity 27, the heat dissipation end 55 of the suction motor 5 and the inner side wall of the installation cavity 27 are surrounded to form a lower air duct, the lower air duct is communicated with the heat dissipation holes 28, the suction inlet 53 of the suction end 51 of the suction motor 5 is communicated with the first air inlet 12, the heat dissipation inlet 57 of the heat dissipation end 55 of the suction motor 5 is communicated with the second lower air inlet 29, and the heat dissipation outlet 58 of the heat dissipation end 55 of the suction motor 5 is communicated with the lower.

During the process of evacuating the external structure by the air suction end 51 of the suction motor 5, the air in the external environment will enter the heat dissipation end 55 of the suction motor 5 through the second lower air inlet 29 and the heat dissipation inlet 57 of the heat dissipation end 55 of the suction motor 5 to form a heat dissipation airflow, the heat dissipation airflow in the heat dissipation end 55 of the suction motor 5 will flow into the lower air duct through the heat dissipation outlet 58 of the heat dissipation end 55 of the suction motor 5, the heat dissipation airflow will flow along the path of the lower air duct, when the heat dissipation airflow enters the heat dissipation channel 26 through the heat dissipation holes 28, the heat dissipation airflow will rotate along the path of the heat dissipation channel 26 until the heat dissipation airflow is discharged from the second lower air outlet 25, thereby dissipating the heat of the suction motor 5 is dissipated, the heat dissipation effect is good, and the flow path of the heat dissipation airflow is extended, so that the noise generated by the flow of the heat dissipation airflow will be lost or offset due to turning interference and the like during the flow process, thereby reach the effect of making an uproar that falls in the amortization, the noise cancelling effect is obvious, and the flow of heat dissipation air current is stable, has prevented that extra random noise from producing, has reduced the velocity of flow of heat dissipation air current, has reached the mesh of making an uproar that falls in the amortization. The heat dissipation airflow is separated from the airflow generated by the air suction, so that the noise generated by the airflow interference is reduced, and the heat dissipation effect of the suction motor 5 is ensured.

Specifically, the first lower air outlet 23 and the second lower air outlet 25 are both opened on the side wall of the lower chamber 2.

In this embodiment, the second lower air inlet 29 is provided with the filter element 33, and the air in the external environment is filtered through the filter element 33, so as to prevent impurities (such as dust and the like) from entering the suction motor 5, the lower air duct or/and the heat dissipation channel 26, and prevent the occurrence of a blocking phenomenon, thereby reducing the failure probability and prolonging the service life of the utility model, the first sealing ring 34 is arranged between the filter element 33 and the installation cavity 27, and the first sealing ring 34 is used for sealing the gap between the filter element 33 and the installation cavity 27, so that the air tightness between the filter element 33 and the installation cavity 27 is improved, and the air leakage phenomenon is avoided.

In this embodiment, a second sealing ring 35 is disposed between the cover plate 3 and the bottom of the lower chamber 2, the second sealing ring 35 is used for sealing a gap between the cover plate 3 and the lower chamber 2, and the second sealing ring 35 is provided with a second through hole 45 communicated with the second air inlet hole 32; this structural design has improved the gas tightness between the bottom of apron 3 and lower cavity 2, avoids the air current to leak and produce the noise from the clearance between the bottom of apron 3 and lower cavity 2, and second sealing washer 35 has certain elasticity moreover, plays buffering and absorbing effect.

In this embodiment, the top lateral wall cover of going up cavity 1 is equipped with second sealing ring 16, and will the utility model discloses install when structural externally, second sealing ring 16 is used for the sealed clearance of going up between cavity 1's the top and the external structure, avoids appearing the phenomenon of gas leakage, guarantees the effect of amortization.

The utility model provides a pair of silencing device, including suction motor 5 and foretell muffler, suction motor 5 induced draft end 51 stretches to cavity 13 in and is located upper silencing passageway 14's central point and puts, and suction motor 5 induced draft end 51 encloses with upper silencing passageway 14's inside wall and establishes into the wind channel, go up wind channel and upper silencing passageway 14's last wind inlet 15 intercommunication, suction motor 5's heat dissipation end 55 stretches to the installation cavity 27 in, and suction motor 5's heat dissipation end 55 encloses with the inside wall of installation cavity 27 and establishes into down the wind channel, wind channel and louvre 28 intercommunication down, suction motor 5's the import 53 that induced drafts end 51 and first fresh air inlet 12 intercommunication, air intake 29 intercommunication under suction motor 5's heat dissipation end 55 heat dissipation import 57 and the second. The silencer has all the beneficial effects of the silencer, and the details are not repeated.

In this embodiment, the top of the mounting core 24 protrudes into the cavity 13, the middle of the cavity 13 is provided with a positioning ring 17, the positioning ring 17 is located at the center of the upper air deflector 11, the top of the mounting core 24 abuts against the bottom surface of the air suction end 51 of the suction motor 5, and the positioning ring 17 is used for positioning the air suction end 51 of the suction motor 5, so as to ensure the position accuracy and stability of the suction motor 5, and facilitate the assembly of the suction motor 5 and the upper chamber 1.

In this embodiment, the second sealing ring 16 is arranged between the air suction end 51 of the suction motor 5 and the positioning ring 17, and the second sealing ring 16 seals the gap between the air suction end 51 of the suction motor 5 and the positioning ring 17, so that the air tightness is good, and the air leakage phenomenon is avoided; the second sealing ring 16 is arranged between the bottom surface of the air suction end 51 of the suction motor 5 and the installation core 24, the second sealing ring 16 seals a gap between the bottom surface of the air suction end 51 of the suction motor 5 and the installation core 24, the communication between an upper air duct and a lower air duct is avoided, the air tightness is improved, and the upper air duct and the lower air duct are guaranteed not to be influenced by each other.

In this embodiment, the heat dissipating end 55 of the suction motor 5 is provided with a protruding limiting portion 59, and the inner sidewall of the mounting cavity 27 is provided with a concave limiting groove 20 for accommodating the limiting portion 59. Through the cooperation of spacing groove 20 and spacing portion 59, the lateral wall of spacing groove 20 is spacing to spacing portion 59 to guarantee the position accuracy and the stability of suction motor 5.

The utility model also provides a pair of silencing device, including aspirator and foretell muffler, the aspirator is located cavity 13, the convulsions import and the 12 intercommunication of first fresh air inlet of aspirator, the lateral wall of aspirator and the inside wall of last sound channel 14 enclose and establish into the wind channel, go up the interior wind gap 15 of sound channel 14 and the convulsions export of aspirator all communicate with last wind channel, the middle part of cavity 13 is provided with holding ring 17, holding ring 17 is used for fixing a position the aspirator, be provided with second sealing ring 16 between the top of aspirator and the holding ring 17. The silencer has all the beneficial effects of the silencer, and the details are not repeated.

All the technical features in the embodiment can be freely combined according to actual needs.

The above-mentioned embodiment is the utility model discloses the implementation scheme of preferred, in addition, the utility model discloses can also realize by other modes, any obvious replacement is all within the protection scope of the utility model under the prerequisite that does not deviate from this technical scheme design.

Claims

1. A muffler characterized by: the improved air conditioner is characterized by comprising an upper cavity, a lower cavity connected to the bottom of the upper cavity and a cover plate connected to the lower cavity, wherein the cover plate is used for covering the bottom of the lower cavity, the upper cavity is provided with an upper air deflector, a first air inlet and a cavity, the first air inlet is communicated with the top of the cavity, the upper air deflector is arc-shaped or spiral and is positioned in the cavity, the upper air deflector and the cavity are surrounded to form an arc-shaped or spiral upper silencing channel, an upper air inlet is formed in the head end of the upper silencing channel, a first lower air inlet is formed in the top surface of the lower cavity, a circuitous lower silencing channel is arranged at the bottom of the lower cavity, the first lower air inlet is used for communicating the tail end of the upper silencing channel and the head end of the lower silencing channel, and a first lower air outlet.

2. A muffler according to claim 1 wherein: a first sealing ring is arranged between the bottom of the upper cavity and the top surface of the lower cavity and used for sealing a gap between the upper cavity and the lower cavity, and a first through hole communicated with the first lower air inlet is formed in the first sealing ring.

3. A muffler according to claim 1 wherein: the middle part of cavity is provided with the installation core down, the bottom of installation core is located the central point of lower amortization passageway and puts, the lateral wall of installation core encloses with the inside wall of lower amortization passageway and establishes into the heat dissipation channel who has air outlet under the second, the concave installation cavity that is equipped with in middle part of installation core, the louvre with heat dissipation channel intercommunication is seted up to the lateral wall of installation cavity, the diapire of installation cavity is provided with air intake under the second, the apron is provided with the second fresh air inlet with air intake intercommunication under the second.

4. A muffler according to claim 3, wherein: the air inlet department has installed the filter core under the second, be provided with first sealing ring between filter core and the installation cavity, first sealing ring is used for the sealed clearance of crossing between filter core and the installation cavity.

5. A muffler according to claim 3, wherein: and a second sealing ring is arranged between the cover plate and the bottom of the lower chamber and used for sealing a gap between the cover plate and the lower chamber, and a second through hole communicated with the second air inlet hole is formed in the second sealing ring.

6. A silencing apparatus, characterized in that: the silencer comprises a suction motor and the silencer according to any one of claims 3 to 5, wherein a suction end of the suction motor extends into a cavity and is positioned in the center of an upper silencing channel, the suction end of the suction motor and the inner side wall of the upper silencing channel are enclosed to form an upper air channel, the upper air channel is communicated with an upper air inlet of the upper silencing channel, a heat dissipation end of the suction motor extends into an installation cavity in an protruding mode, a heat dissipation end of the suction motor and the inner side wall of the installation cavity are enclosed to form a lower air channel, the lower air channel is communicated with heat dissipation holes, a suction inlet of the suction end of the suction motor is communicated with a first air inlet hole, and a heat dissipation inlet of the heat dissipation end of the suction motor is communicated with a.

7. The acoustic abatement apparatus of claim 6, wherein: the top of the installation core protrudes into the cavity, a positioning ring is arranged in the middle of the cavity and is located at the center of the upper air deflector, the top of the installation core abuts against the bottom face of the air suction end of the suction motor, and the positioning ring is used for positioning the air suction end of the suction motor.

8. The acoustic abatement apparatus of claim 7, wherein: a second sealing ring is arranged between the air suction end of the suction motor and the positioning ring, and a second sealing ring is arranged between the bottom surface of the air suction end of the suction motor and the mounting core.

9. The acoustic abatement apparatus of claim 6, wherein: the heat dissipation end of the suction motor is convexly provided with a limiting portion, and the inner side wall of the installation cavity is concavely provided with a limiting groove for accommodating the limiting portion.

10. A silencing apparatus, characterized in that: the silencer comprises an air extractor and the silencer as claimed in any one of claims 1 to 5, wherein the air extractor is located in the cavity, an air suction inlet of the air extractor is communicated with the first air inlet hole, an upper air channel is formed by the outer side wall of the air extractor and the inner side wall of the upper sound channel in an enclosing mode, and the upper air inlet of the upper sound channel and an air suction outlet of the air extractor are communicated with the upper air channel.