Back cavity micro-perforated sound absorption device with shock absorption and noise reduction functions

Abstract

The invention relates to the technical field of noise control, in particular to a back cavity micro-perforated sound absorption device with shock absorption and noise reduction, which comprises an outer wall, an adjusting mechanism is arranged on one side of the outer wall, a shock absorption plate is slidably arranged in the outer wall, and the shock absorption plate is arranged on one side of the outer wall. And the adjusting mechanism comprises a first adjusting plate fixedly connected with the damping plate, an extrusion plate is arranged at the bottom of the first adjusting plate in a sliding mode, the outer side of the extrusion plate is sleeved with an inflator pump, and one side of the inflator pump communicates with an air storage cylinder. And a third extrusion column moves to drive a moving plate to slide in an observation cylinder, and when the moving plate is stable, whether the interior of the cavity is sealed or not can be detected by observing whether the moving plate continues to move or not, so that the sealing performance of the interior of the cavity is conveniently detected, and the situation that the noise reduction effect of the device is affected due to the fact that the device is damaged in the long-time use process is avoided.

Description

Technical Field

[0001] This invention relates to the field of noise control technology, specifically to a back cavity micro-perforated sound-absorbing device with vibration reduction and noise reduction capabilities. Background Technology

[0002] In recent years, my country's new energy vehicle industry has shown a vigorous development trend, bringing significant convenience to public travel. However, this development has also been accompanied by increasingly prominent vehicle noise problems. With the continuous improvement of people's quality of life, noise pollution has gradually become an important issue of widespread social concern. Noise pollution has had a profound and irreversible negative impact on people's production and life. Numerous studies have confirmed that the effects of noise on humans and animals have multifaceted characteristics. Existing back cavity micro-perforated sound absorption devices may experience sealing failure in the internal cavity during long-term use, and it is inconvenient to check the sealing of the cavity during use, thus affecting the normal operation of the device. Summary of the Invention

[0003] The purpose of this invention is to provide a back cavity micro-perforated sound absorption device with shock absorption and noise reduction. The device uses a movable disc to move a third extrusion column, which in turn causes a movable plate to slide inside an observation cylinder. When the movable plate is stable, the device can detect whether the cavity is sealed by observing whether the movable plate continues to move. This facilitates the detection of the cavity's sealing performance and prevents damage to the device during long-term use, which would affect the device's noise reduction effect.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a back cavity micro-perforated sound absorption device with vibration reduction and noise reduction, comprising an outer wall, an adjustment mechanism provided on one side of the outer wall, and a vibration damping plate sliding inside the outer wall; The adjustment mechanism includes a first adjustment plate fixedly connected to the shock absorber plate, a compression plate slidingly at the bottom of the first adjustment plate, an air cylinder sleeved on the outside of the compression plate, an air storage cylinder connected to one side of the air cylinder, a second air supply pipe connected to one end of the air storage cylinder, a baffle provided inside the second air supply pipe, and a detection mechanism provided on one side of the outer wall. The detection mechanism includes a second adjusting plate that moves along one side of the outer wall. One end of the second adjusting plate penetrates the outer wall. A telescopic plate is provided at the bottom of the second adjusting plate. One end of the telescopic plate is connected to a shock-absorbing plate. A first movable sleeve is provided inside the outer wall. A second extrusion column slides inside the first movable sleeve. A rack is provided at one end of the second extrusion column. A gear is provided at the upper end of the air storage cylinder. One end of the gear is connected to a baffle. A second movable sleeve is also provided inside the outer wall. A third extrusion column slides inside the second movable sleeve. An observation cylinder is provided on the outside of the second movable sleeve. A movable plate is fixed at one end of the third extrusion column.

[0005] Preferably, a first micro-perforated plate is provided at the top of the outer wall, two sets of inclined plates are provided at the bottom of the first micro-perforated plate, and a second micro-perforated plate is provided at the bottom of the inclined plates.

[0006] Preferably, the damping plate is provided with multiple sets of damping inside, one end of the first adjusting plate passes through the outer wall and is connected to the damping plate, and a sealing plate is provided at the point where the first adjusting plate passes through the outer wall, and the sealing plate is sealed to the outer wall.

[0007] Preferably, a base plate is provided on one side of the outer wall, the bottom of the air cylinder is connected to the base plate, two sets of first connecting columns are provided at the bottom of the first adjusting plate, the bottom of the two sets of first connecting columns pass through the air cylinder and are connected to the extrusion plate, an air suction pipe is provided on the air cylinder, a first one-way valve is provided inside the air suction pipe, a first air delivery pipe is connected to the bottom of the air cylinder, a second one-way valve is provided inside the first air delivery pipe, and one end of the first air delivery pipe is connected to the air storage cylinder and the second air delivery pipe respectively.

[0008] Preferably, the outer wall has a groove inside, and one end of the second adjusting plate is inserted into the groove when it slides.

[0009] Preferably, one end of the second extrusion column is provided with a first extrusion column, the first extrusion column is disposed in a groove inside the outer wall, a first spring is sleeved on the outside of the second extrusion column, the other end of the second extrusion column is connected to a third connecting column, one end of the first spring is connected to the second extrusion column, and the other end of the first spring is connected to the inner wall of the first movable sleeve.

[0010] Preferably, one end of the third connecting post is connected to the rack, the rack meshes with the gear, the bottom of the gear is connected to the second connecting post, the second connecting post passes through the second air supply pipe and is connected to the baffle, and a protective shell is fitted on the outside of the gear.

[0011] Preferably, a movable disc is provided at one end of the third extrusion column, a second spring is provided on the outside of the third extrusion column, and a movable plate is provided at the other end of the third extrusion column. The movable plate slides inside the observation cylinder. The observation cylinder is made of transparent material and is provided with graduations.

[0012] Preferably, one end of the second spring is connected to the third compression column, and the other end of the second spring is connected to the inner wall of the second movable sleeve.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes the movement of a movable disc to drive the movement of a third extrusion column. The movement of the third extrusion column causes a movable plate to slide inside the observation cylinder. When the movable plate is stable, by observing whether the movable plate continues to move, it is possible to detect whether the cavity is sealed. This facilitates the detection of the sealing performance inside the cavity, preventing damage to the device during long-term use and thus affecting the noise reduction effect of the device.

[0014] 2. This invention moves the first adjusting plate to drive the damping plate to move, thereby adjusting the depth between the second micro-perforated plate and the damping plate, thus adjusting the depth of the cavity, and changing the resonant frequency of the system. This achieves the shift of the sound absorption peak frequency, ensuring that the device absorbs sound waves of different frequencies in different environments and improving the practicality of the device.

[0015] 3. The present invention enables the operator to move the telescopic plate by pushing the second adjusting plate, and at the same time the telescopic plate is connected to the damping plate. The movement of the damping plate causes the telescopic plate to extend and retract, thereby changing the shape of the cavity on the damping plate, and then changing the resonant frequency of the system again, further improving the absorption of sound waves of different frequencies by the device. Attached Figure Description

[0016] Figure 1 This is one of the overall structural schematic diagrams of the present invention; Figure 2 This is a second schematic diagram of the overall structure of the present invention; Figure 3 This is one of the structural schematic diagrams of the adjustment mechanism of the present invention; Figure 4 This is a second schematic diagram of the adjustment mechanism of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of section A in the middle; Figure 6 This is a partial structural diagram of the detection mechanism of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of section B; Figure 8 For the present invention Figure 6 Enlarged view of section C.

[0017] In the diagram: 1. Outer wall; 11. First micro-perforated plate; 12. Inclined plate; 13. Second micro-perforated plate; 14. Shock-absorbing plate; 2. Adjustment mechanism; 21. First adjustment plate; 22. First connecting column; 23. Extrusion plate; 24. Air cylinder; 25. Base plate; 26. First air supply pipe; 27. Inhalation pipe; 29. ​​Second air supply pipe; 210. Baffle; 211. Second connecting column; 212. Sealing plate; 213. Air storage cylinder; 3. Detection mechanism; 31. Second adjustment plate; 32. Telescopic plate; 33. First extrusion column; 34. Third connecting column; 35. First movable sleeve; 36. Second extrusion column; 37. First spring; 38. Rack; 39. Gear; 310. Observation cylinder; 311. Moving plate; 312. Movable disc; 313. Third extrusion column; 314. Second spring; 315. Second movable sleeve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] See Figures 1 to 8 As shown, the present invention provides a back cavity micro-perforated sound absorption device with shock absorption and noise reduction, including an outer wall 1, an adjustment mechanism 2 provided on one side of the outer wall 1, and a shock-absorbing plate 14 sliding inside the outer wall 1. The adjustment mechanism 2 includes a first adjustment plate 21 fixedly connected to the shock absorber 14. A compression plate 23 slides at the bottom of the first adjustment plate 21. An air cylinder 24 is sleeved on the outside of the compression plate 23. An air storage cylinder 213 is connected to one side of the air cylinder 24. A second air supply pipe 29 is connected to one end of the air storage cylinder 213. One end of the second air supply pipe 29 is connected to the inside of the outer wall 1. A baffle 210 is provided inside the second air supply pipe 29. A detection mechanism 3 is also provided on one side of the outer wall 1. The testing mechanism 3 includes a second adjusting plate 31 that moves on one side of the outer wall 1. One end of the second adjusting plate 31 passes through the outer wall 1. A telescopic plate 32 is provided at the bottom of the second adjusting plate 31. One end of the telescopic plate 32 is connected to the shock-absorbing plate 14. A first movable sleeve 35 is provided inside the outer wall 1. A second extrusion column 36 slides inside the first movable sleeve 35. A rack 38 is provided at one end of the second extrusion column 36. A gear 39 is provided at the upper end of the air storage cylinder 213. One end of the gear 39 is connected to the baffle 210. A second movable sleeve 315 is also provided inside the outer wall 1. A third extrusion column 313 slides inside the second movable sleeve 315. An observation cylinder 310 is provided on the outside of the second movable sleeve 315. A movable plate 311 is fixed at one end of the third extrusion column 313.

[0020] When sound waves are incident on the first micro-perforated plate 11, the air in the first micro-perforated plate 11 is transmitted to the interior of the outer wall 1. When the air moves back and forth at high speed in the extremely small holes, it will generate intense friction with the hole wall. At the same time, due to the viscosity of the air, eddies will be generated. This friction and viscosity will effectively convert sound energy into heat energy, thereby achieving sound absorption. Meanwhile, the inclined plate 12 makes the area on the second micro-perforated plate 13 form a frustum shape, which works together with the area at the bottom of the second micro-perforated plate 13 to enhance the sound absorption effect of the device.

[0021] At the same time, when the sound wave is transmitted to the damping plate 14, the transmitted vibration is reduced by the damping inside the damping plate 14.

[0022] Meanwhile, the staff moved the first adjusting plate 21 to move the damping plate 14, adjusting the depth between the second micro-perforated plate 13 and the damping plate 14, thereby adjusting the depth of the cavity and changing the resonant frequency of the system. This resulted in the shift of the sound absorption peak frequency, ensuring that the device could absorb sound waves of different frequencies in different environments and improving the practicality of the device.

[0023] Simultaneously, when the first adjusting plate 21 moves, it drives the first connecting column 22 to move. The movement of the first connecting column 22 drives the extrusion plate 23 to move. When the extrusion plate 23 moves, it discharges the gas in the inflation cylinder 24 into the storage cylinder 213 through the first air supply pipe 26. At the same time, since the second air supply pipe 29 is equipped with a baffle 210 and the first air supply pipe 26 is equipped with a second one-way valve, the gas is stored inside the storage cylinder 213. Meanwhile, when the extrusion plate 23 moves, it draws the outside gas into the inflation cylinder 24 through the second one-way valve inside the suction pipe 27, thereby inflating the storage cylinder 213 during adjustment.

[0024] At the same time, the staff pushes the second adjustment plate 31 to move, which in turn moves the telescopic plate 32. The telescopic plate 32 is connected to the damping plate 14. The movement of the damping plate 14 causes the telescopic plate 32 to extend and retract, thereby changing the shape of the cavity on the damping plate 14, and thus changing the resonant frequency of the system again, further improving the absorption of sound waves of different frequencies by the device.

[0025] After working for a period of time, the operator pushes the second adjusting plate 31 into the groove inside the outer wall 1, forming a sealed cavity at the upper end of the shock-absorbing plate 14. Simultaneously, as the second adjusting plate 31 moves, it presses against the first pressing column 33. The movement of the first pressing column 33 drives the second pressing column 36 to move, thereby pushing the third connecting column 34 to move. The movement of the third connecting column 34 drives the rack 38 to move, which in turn drives the gear 39 to rotate. The rotation of the gear 39 drives the second connecting column 211 to rotate, which in turn drives the baffle 210 to rotate. The rotation of the baffle 210 connects the second air supply pipe 29 to the outer wall 1. The gas in the gas storage cylinder 213 enters the sealed cavity inside the outer wall 1 through the second gas supply pipe 29, increasing the air pressure inside the cavity and squeezing the movable disc 312. The movement of the movable disc 312 drives the third extrusion column 313 to move. The movement of the third extrusion column 313 drives the moving plate 311 to slide inside the observation cylinder 310. When the inside of the moving plate 311 is stable, by observing whether the moving plate 311 continues to move, it is possible to detect whether the inside of the cavity is sealed, thereby detecting the sealing performance of the cavity and preventing damage and leakage during long-term use of the device, which would affect the noise reduction effect of the device.

[0026] Simultaneously, after the test is completed, the staff manually pulls the second adjusting plate 31 to move it, so that the second adjusting plate 31 resets. When the second adjusting plate 31 resets, the elastic force of the first spring 37 pushes the second extrusion column 36 to move, which in turn moves the first extrusion column 33, the third connecting column 34, and the rack 38, thereby driving the gear 39 to reset, so that the outer wall 1 is disconnected from the second air supply pipe 29 to avoid affecting the next operation. At the same time, after the second adjusting plate 31 resets, the gas inside the cavity is discharged through the second micro-perforated plate 13, which reduces the air pressure inside the cavity. The second spring 314 squeezes the first extrusion column 33 to move, which in turn moves the moving plate 311 and the movable plate 312 to facilitate the next monitoring.

[0027] In an optional embodiment, a first micro-perforated plate 11 is provided at the top of the outer wall 1, two sets of inclined plates 12 are provided at the bottom of the first micro-perforated plate 11, and a second micro-perforated plate 13 is provided at the bottom of the inclined plates 12.

[0028] It should be noted that when the sound wave is incident on the first micro-perforated plate 11, the air in the first micro-perforated plate 11 is transmitted to the interior of the outer wall 1. When the air moves back and forth at high speed in the extremely small holes, it will generate intense friction with the hole wall. At the same time, due to the viscosity of the air, eddies will be generated. This friction and viscosity will effectively convert sound energy into heat energy, thereby achieving sound absorption. Meanwhile, the inclined plate 12 makes the area on the second micro-perforated plate 13 form a frustum shape, which works together with the area at the bottom of the second micro-perforated plate 13 to enhance the sound absorption effect of the device.

[0029] In an optional embodiment, the damping plate 14 is provided with multiple sets of damping. One end of the first adjusting plate 21 passes through the outer wall 1 and is connected to the damping plate 14. A sealing plate 212 is provided at the point where the first adjusting plate 21 passes through the outer wall 1, and the sealing plate 212 seals with the outer wall 1.

[0030] It should be noted that when the sound wave is transmitted to the damping plate 14, the vibration transmitted is reduced by the damping inside the damping plate 14. At the same time, when the first adjusting plate 21 moves, it drives the sealing plate 212 to move, ensuring that the gas inside the outer wall 1 will not leak.

[0031] In an optional embodiment, a base plate 25 is provided on one side of the outer wall 1, the bottom of the air cylinder 24 is connected to the base plate 25, the bottom of the first adjusting plate 21 is provided with two sets of first connecting columns 22, the bottom of the two sets of first connecting columns 22 are connected to the extrusion plate 23 through the air cylinder 24, the air cylinder 24 is provided with an air suction pipe 27, the air suction pipe 27 is provided with a first one-way valve, the bottom of the air cylinder 24 is connected to a first air delivery pipe 26, the first air delivery pipe 26 is provided with a second one-way valve, and one end of the first air delivery pipe 26 is connected to the air storage cylinder 213 and the second air delivery pipe 29 respectively.

[0032] It should be noted that when the first adjusting plate 21 moves, it drives the first connecting column 22 to move. The movement of the first connecting column 22 drives the extrusion plate 23 to move. When the extrusion plate 23 moves, it discharges the gas in the inflation cylinder 24 into the storage cylinder 213 through the first air supply pipe 26. At the same time, since the second air supply pipe 29 is equipped with a baffle 210 and the first air supply pipe 26 is equipped with a second one-way valve, the gas is stored in the storage cylinder 213. Meanwhile, when the extrusion plate 23 moves, it draws the outside gas into the inflation cylinder 24 through the second one-way valve inside the suction pipe 27, thereby inflating the storage cylinder 213 during adjustment.

[0033] In an optional embodiment, a groove is provided inside the outer wall 1, and one end of the second adjusting plate 31 is inserted into the groove when it slides.

[0034] It should be noted that the second adjusting plate 31 is inserted into the groove inside the outer wall 1, so that a sealed cavity is formed at the upper end of the shock-absorbing plate 14.

[0035] In an optional embodiment, a first extrusion post 33 is provided at one end of the second extrusion post 36. The first extrusion post 33 is disposed in a groove inside the outer wall 1. A first spring 37 is sleeved on the outside of the second extrusion post 36. A third connecting post 34 is connected to the other end of the second extrusion post 36. One end of the first spring 37 is connected to the second extrusion post 36, and the other end of the first spring 37 is connected to the inner wall of the first movable sleeve 35.

[0036] It should be noted that when the second adjusting plate 31 moves, it presses the first pressing column 33. The movement of the first pressing column 33 drives the second pressing column 36 to move, thereby pushing the third connecting column 34 to move. At the same time, when the second adjusting plate 31 resets, the elastic force of the first spring 37 pushes the second pressing column 36 to move, which in turn drives the first pressing column 33 and the third connecting column 34 to move.

[0037] In an optional embodiment, one end of the third connecting post 34 is connected to the rack 38, the rack 38 meshes with the gear 39, the bottom of the gear 39 is connected to the second connecting post 211, the second connecting post 211 passes through the second air supply pipe 29 and is connected to the baffle 210, and a protective shell is fitted on the outside of the gear 39.

[0038] It should be noted that the movement of the third connecting column 34 causes the rack 38 to move, the movement of the rack 38 causes the gear 39 to rotate, the rotation of the gear 39 causes the second connecting column 211 to rotate, the rotation of the second connecting column 211 causes the baffle 210 to rotate, and the rotation of the baffle 210 causes the second air supply pipe 29 to connect with the outer wall 1, and the gas in the air storage cylinder 213 enters the sealed cavity inside the outer wall 1 through the second air supply pipe 29.

[0039] In an optional embodiment, a movable disc 312 is provided at one end of the third extrusion column 313, a second spring 314 is provided on the outside of the third extrusion column 313, and a movable plate 311 is provided at the other end of the third extrusion column 313. The movable plate 311 slides inside the observation cylinder 310. The observation cylinder 310 is made of transparent material and is provided with a scale.

[0040] It should be noted that the increased air pressure inside the cavity compresses the movable disc 312, and the movement of the movable disc 312 causes the third extrusion column 313 to move. The movement of the third extrusion column 313 causes the movable plate 311 to slide inside the observation cylinder 310.

[0041] In an optional embodiment, one end of the second spring 314 is connected to the third compression post 313, and the other end of the second spring 314 is connected to the inner wall of the second movable sleeve 315.

[0042] It should be noted that the gas inside the cavity is discharged through the second micro-perforated plate 13, which reduces the air pressure inside the cavity. The second spring 314 squeezes the first extrusion column 33 to move, which in turn moves the moving plate 311 and the movable disk 312 to reset.

[0043] Working principle: When sound waves are incident on the first micro-perforated plate 11, the air in the first micro-perforated plate 11 is transmitted to the interior of the outer wall 1. When the air moves back and forth at high speed in the extremely small holes, it will generate intense friction with the hole wall. At the same time, due to the viscosity of the air, eddies will be generated. This friction and viscosity will effectively convert sound energy into heat energy.

[0044] Meanwhile, the staff moved the first adjusting plate 21 to move the damping plate 14, adjusting the depth between the second micro-perforated plate 13 and the damping plate 14, thereby adjusting the depth of the cavity.

[0045] Simultaneously, when the first adjusting plate 21 moves, it drives the first connecting column 22 to move. The movement of the first connecting column 22 drives the extrusion plate 23 to move. When the extrusion plate 23 moves, it discharges the gas in the inflation cylinder 24 into the storage cylinder 213 through the first air supply pipe 26. At the same time, since the second air supply pipe 29 is equipped with a baffle 210 and the first air supply pipe 26 is equipped with a second one-way valve, the gas is stored inside the storage cylinder 213. Meanwhile, when the extrusion plate 23 moves, it draws the outside gas into the inflation cylinder 24 through the second one-way valve inside the suction pipe 27, thereby inflating the storage cylinder 213 during adjustment.

[0046] At the same time, the staff pushes the second adjusting plate 31 to move, which in turn moves the telescopic plate 32. The telescopic plate 32 is connected to the shock absorber plate 14. The movement of the shock absorber plate 14 causes the telescopic plate 32 to extend and retract, thereby changing the shape of the cavity on the shock absorber plate 14.

[0047] After working for a period of time, the staff pushes the second adjusting plate 31 to insert into the groove inside the outer wall 1, so that the upper end of the shock-absorbing plate 14 forms a sealed cavity. At the same time, when the second adjusting plate 31 moves, it squeezes the first squeezing column 33. The movement of the first squeezing column 33 drives the second squeezing column 36 to move, thereby pushing the third connecting column 34 to move. The movement of the third connecting column 34 drives the rack 38 to move. The movement of the rack 38 drives the gear 39 to rotate. The rotation of the gear 39 drives the second connecting column 211 to rotate. The rotation of the second connecting column 211 drives the baffle 210 to rotate. The rotation of the baffle 210 connects the second air supply pipe 29 to the outer wall 1. The gas in the air storage cylinder 213 enters the sealed cavity inside the outer wall 1 through the second air supply pipe 29, which increases the air pressure inside the cavity and squeezes the movable plate 312. The movement of the movable plate 312 drives the third squeezing column 313 to move. The movement of the third squeezing column 313 drives the movable plate 311 to slide inside the observation cylinder 310. When the inside of the movable plate 311 is stable, observe whether the movable plate 311 continues to move.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A back cavity micro-perforated sound-absorbing device with vibration reduction and noise reduction, comprising an outer wall (1), characterized in that, An adjustment mechanism (2) is provided on one side of the outer wall (1), and a shock-absorbing plate (14) slides inside the outer wall (1). The adjustment mechanism (2) includes a first adjustment plate (21) fixedly connected to the shock absorber plate (14). A compression plate (23) slides on the bottom of the first adjustment plate (21). An air cylinder (24) is sleeved on the outside of the compression plate (23). An air storage cylinder (213) is connected to one side of the air cylinder (24). A second air supply pipe (29) is connected to one end of the air storage cylinder (213). One end of the second air supply pipe (29) is connected to the inside of the outer wall (1). A baffle (210) is provided inside the second air supply pipe (29). A detection mechanism (3) is also provided on one side of the outer wall (1). The detection mechanism (3) includes a second adjusting plate (31) that moves on one side of the outer wall (1). One end of the second adjusting plate (31) passes through the outer wall (1). A telescopic plate (32) is provided at the bottom of the second adjusting plate (31). One end of the telescopic plate (32) is connected to the shock-absorbing plate (14). A first movable sleeve (35) is provided inside the outer wall (1). A second extrusion column (36) slides inside the first movable sleeve (35). A rack (38) is provided at one end of the second extrusion column (36). A gear (39) is provided at the upper end of the air storage cylinder (213). One end of the gear (39) is connected to the baffle (210). A second movable sleeve (315) is also provided inside the outer wall (1). A third extrusion column (313) slides inside the second movable sleeve (315). An observation cylinder (310) is provided on the outside of the second movable sleeve (315). A movable plate (311) is fixed at one end of the third extrusion column (313).

2. The back cavity micro-perforated sound absorption device with vibration reduction and noise reduction according to claim 1, characterized in that, The top of the outer wall (1) is provided with a first micro-perforated plate (11), the bottom of the first micro-perforated plate (11) is provided with two sets of inclined plates (12), and the bottom of the inclined plates (12) is provided with a second micro-perforated plate (13).

3. The back cavity micro-perforated sound absorption device with vibration reduction and noise reduction according to claim 1, characterized in that, The damping plate (14) is provided with multiple sets of damping. One end of the first adjusting plate (21) passes through the outer wall (1) and is connected to the damping plate (14). A sealing plate (212) is provided at the point where the first adjusting plate (21) passes through the outer wall (1). The sealing plate (212) is sealed to the outer wall (1).

4. The back cavity micro-perforated sound absorption device with vibration reduction and noise reduction according to claim 1, characterized in that, A base plate (25) is provided on one side of the outer wall (1). The bottom of the air cylinder (24) is connected to the base plate (25). Two sets of first connecting columns (22) are provided at the bottom of the first adjusting plate (21). The bottom of the two sets of first connecting columns (22) passes through the air cylinder (24) and is connected to the extrusion plate (23). An air suction pipe (27) is provided on the air cylinder (24). A first one-way valve is provided inside the air suction pipe (27). A first air delivery pipe (26) is connected to the bottom of the air cylinder (24). A second one-way valve is provided inside the first air delivery pipe (26). One end of the first air delivery pipe (26) is connected to the air storage cylinder (213) and the second air delivery pipe (29) respectively.

5. The back cavity micro-perforated sound absorption device with vibration reduction and noise reduction according to claim 1, characterized in that, The outer wall (1) has a groove inside, and one end of the second adjusting plate (31) is inserted into the groove when it slides.

6. The back cavity micro-perforated sound absorption device with vibration reduction and noise reduction according to claim 1, characterized in that, The second extrusion column (36) has a first extrusion column (33) at one end, the first extrusion column (33) is located in a groove inside the outer wall (1), the second extrusion column (36) is sleeved with a first spring (37) on the outside, the second extrusion column (36) is connected to a third connecting column (34) at the other end, one end of the first spring (37) is connected to the second extrusion column (36), and the other end of the first spring (37) is connected to the inner wall of the first movable sleeve (35).

7. A back cavity micro-perforated sound-absorbing device with vibration reduction and noise reduction according to claim 6, characterized in that, One end of the third connecting post (34) is connected to the rack (38), the rack (38) meshes with the gear (39), the bottom of the gear (39) is connected to the second connecting post (211), the second connecting post (211) passes through the second air supply pipe (29) and is connected to the baffle (210), and the gear (39) is covered with a protective shell.

8. The back cavity micro-perforated sound absorption device with vibration reduction and noise reduction according to claim 1, characterized in that, One end of the third extrusion column (313) is provided with a movable disc (312), a second spring (314) is provided on the outside of the third extrusion column (313), and a movable plate (311) is provided on the other end of the third extrusion column (313). The movable plate (311) slides inside the observation cylinder (310). The observation cylinder (310) is made of transparent material and is provided with a scale.

9. A back cavity micro-perforated sound-absorbing device with vibration reduction and noise reduction according to claim 8, characterized in that, One end of the second spring (314) is connected to the third extrusion column (313), and the other end of the second spring (314) is connected to the inner wall of the second movable sleeve (315).

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