Fresh air system pipeline silencer

Abstract

The invention relates to a fresh air system pipeline silencing device, and relates to the technical field of pipeline silencing, the fresh air system pipeline silencing device comprises an air pipe and a damping block, the damping block is provided with a mounting assembly, the mounting assembly is used for mounting the damping block on a wall, the damping block is slidably provided with a damping plate, the damping block is provided with a damping spring, and the damping spring is arranged on the damping plate. The damping spring is arranged between the damping plate and the damping block and connected with the damping plate, the damping plate is connected with the air pipe, and the air pipe is provided with sound absorption cotton. The fresh air system has the effects of reducing the noise of the fresh air system pipeline and improving the indoor living experience.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline silencing, and in particular to a pipeline silencing device for a fresh air system. Background Art

[0002] As people pay more and more attention to air pollution, fresh air systems have begun to enter people's field of vision and are widely used in residential areas, office places and other places. At present, domestic fresh air systems are mainly divided into one-way flow fresh air systems, two-way flow fresh air systems, heat exchange fresh air systems and floor air supply fresh air systems.

[0003] Although the fresh air system can purify the indoor air, the operation of the fan will cause a lot of noise, affecting the indoor living experience. The existing technology has designed silent fans to reduce the noise generated by the fan, but during the use of the fresh air ducts arranged around the room, the vibration generated by the air flowing in the ducts will also cause noise, thus affecting the indoor living experience. Summary of the invention

[0004] In order to reduce the noise of the fresh air system duct and improve the indoor living experience, the present application provides a fresh air system duct silencing device.

[0005] The present application provides a fresh air system duct silencing device adopts the following technical solution: A duct silencer for a fresh air system comprises an air duct and a shock absorbing block, wherein the shock absorbing block is provided with a mounting assembly, and the mounting assembly is used to mount the shock absorbing block on a wall, the shock absorbing block is slidably provided with a shock absorbing plate, the shock absorbing block is provided with a shock absorbing spring, the shock absorbing spring is provided between the shock absorbing plate and the shock absorbing block and is connected to the shock absorbing plate, the shock absorbing plate is connected to the air duct, and the air duct is provided with sound absorbing cotton.

[0006] By adopting the above technical solution, the sound-absorbing cotton in the air duct absorbs the noise generated by the air flow. At the same time, the installation component installs the shock-absorbing block on the wall, and the air duct is installed on the shock-absorbing plate on which the shock-absorbing block is slidably set. The shock-absorbing spring is used for buffering to reduce the vibration of the shock-absorbing plate and the air duct, thereby reducing the noise generated by the rotation of the air duct driven by the flow of airflow, thereby reducing the noise of the fresh air system pipe, realizing the sound-absorbing function, and improving the indoor living experience.

[0007] Preferably, the mounting assembly comprises a mounting plate and mounting bolts, the mounting plate being arranged on the shock absorbing block, and the mounting bolts being used to mount the mounting plate on the wall.

[0008] By adopting the above technical solution, the mounting plate is installed on the wall by installing bolts, and the shock-absorbing block is installed on the wall, thereby completing the installation of the fresh air system pipeline. The operation is simple and convenient, and the installation and removal of the air duct is convenient.

[0009] Preferably, the air duct includes a first pipe and a second pipe, an assembly component is arranged between the first pipe and the second pipe, the assembly component is used to assemble the first pipe and the second pipe, the first pipe and the second pipe are both provided with installation grooves, and the sound-absorbing cotton is arranged in the installation grooves.

[0010] By adopting the above technical solution, the air duct is assembled through multiple pipes and assembled through assembly components, which is convenient for repair and replacement when problems occur in the air duct. At the same time, the sound-absorbing cotton is arranged in the installation groove. On the one hand, the possibility of the sound-absorbing cotton being damaged by collision is reduced, and on the other hand, the sound-absorbing cotton itself has a certain elasticity, which cushions the pipes on both sides in the installation groove, thereby reducing the vibration of the pipe itself, thereby reducing noise and assisting in silencing.

[0011] Preferably, the assembly component comprises a first assembly block, a second assembly block and an assembly plug-in block, the first assembly block is arranged at one end of the first pipe or the second pipe, the second assembly block is arranged on the other end of the first pipe or the second pipe, the first assembly block can be abutted against the second assembly block, the assembly plug-in block is arranged on the second assembly block, the first assembly block is provided with an assembly slot, the assembly plug-in block is inserted into the assembly slot and can rotate in the assembly slot, the assembly plug-in block is provided with a stopping block, the first assembly block is provided with a first stopping groove communicating with the assembly slot, the inner wall of the assembly slot is provided with a second stopping groove communicating with the first stopping groove, the stopping block can pass through the first stopping groove, be inserted into the second stopping groove and move in the second stopping groove.

[0012] By adopting the above technical solution, when assembling the first pipe and the second pipe, the first assembly block and the second assembly block are symmetrically fitted together, so that the assembly plug block is inserted into the assembly slot, and at the same time, the locking block is inserted into the second locking slot through the first locking slot, and the second pipe is rotated to drive the locking block to move and rotate in the second locking slot, so that the first assembly block and the second assembly block are assembled together to complete the assembly, which is simple and convenient to operate and convenient for assembly and disassembly of the air duct.

[0013] Preferably, the first assembly block is provided with a first fixing block, the second assembly block is provided with a second fixing block, the shock absorbing plate is provided with a fixing hole, the first fixing block can be abutted against the second fixing block, and the first fixing block and the second fixing block can be inserted into the fixing hole.

[0014] By adopting the above technical solution, the second pipe is rotated during assembly, so that the second fixing block is rotated to abut against and close to the first fixing block. At this time, the shock-absorbing plate is pushed to compress the shock-absorbing spring and then the second fixing block and the first fixing block are inserted into the fixing hole of the shock-absorbing plate, thereby completing the connection and installation of the air duct and the shock-absorbing plate. The first fixing block and the second fixing block are limited by the fixing hole, so that the first assembly block and the second assembly block cannot rotate relative to each other, thereby improving the stability of the assembly. At the same time, the first fixing block and the second fixing block abut against the inner wall of the fixing hole, reducing the possibility of the air duct sliding up and down and front and back, thereby improving the stability of the air duct installation.

[0015] Preferably, the shock-absorbing block is provided with an auxiliary plate, a rotating block is rotatably provided on the shock-absorbing plate, the rotating block passes through the shock-absorbing plate and is slidably and rotatably connected to the shock-absorbing plate, the fixing hole is provided on the rotating block, the shock-absorbing spring is provided between the auxiliary plate and the shock-absorbing plate, the first fixing block and the second fixing block are inserted into the fixing hole and are threadedly connected to the fixing hole.

[0016] By adopting the above technical solution, the first fixing block and the second fixing block are closed and inserted into the fixing hole. At this time, the rotating block is rotated so that the first fixing block and the second fixing block are threadedly connected to the fixing hole, thereby reducing the possibility of the first fixing block and the second fixing block withdrawing from the fixing hole and improving the stability of the air duct assembly.

[0017] Preferably, the shock absorbing spring is sleeved on the rotating block.

[0018] By adopting the above technical solution, the shock-absorbing spring is sleeved on the rotating block, and the shock-absorbing spring is positioned and limited by the rotating block, thereby reducing the possibility of leakage or damage of the shock-absorbing spring due to excessive pressure, and improving durability.

[0019] Preferably, the first assembly block is slidingly provided with a limit rod, the first fixed block is provided with a first limit groove, the second fixed block is provided with a second limit groove, the limit rod can be inserted into the first limit groove and the second limit groove, and the first assembly block is provided with a driving component, and the driving component is used to drive the limit rod to move.

[0020] By adopting the above technical solution, the limiting rod is moved and inserted into the first limiting groove and the second limiting groove by the driving component, so that the first fixed block and the second fixed block are limited after assembly, thereby reducing the possibility of relative displacement between the first fixed block and the second fixed block during the use of the air duct, improving the stability of the docking between the first pipe and the second pipe, and improving the stability of the assembly.

[0021] Preferably, the drive assembly includes a main drive gear, a first drive gear, a second drive gear and a drive internal gear. The first assembly block is provided with a drive groove communicating with the second locking groove. The first drive gear, the second drive gear and the drive internal gear are all rotatably arranged in the drive groove. The second drive gear is meshed between the first drive gear and the drive internal gear. The center of the main drive gear passes through and is rotatably arranged in the second locking groove. The main drive gear is inserted into the drive groove and meshes with the first drive gear. The limit rod is connected to the drive internal gear. The main drive gear is provided with a third locking groove, and the locking block can be inserted into the third locking groove.

[0022] By adopting the above technical solution, during assembly, the locking block is inserted into the third locking groove simultaneously when inserted into the second locking groove. When the second pipe is rotated, the locking block pushes the main driving gear to rotate in the second locking groove. The engagement of the first driving gear and the second driving gear drives the driving internal gear to rotate, thereby driving the limiting rod to rotate and insert into the first limiting groove and the limiting groove. The operation is simple, convenient and easy to use.

[0023] Preferably, the first assembly block is provided with a first connecting groove communicated with the driving groove, the limiting rod is provided with a connecting rod, the connecting rod passes through the first connecting groove and is connected to the driving internal gear, and the first fixing block is provided with a second connecting groove communicated with both the first limiting groove and the first connecting groove, and the connecting rod can be inserted into the second connecting groove.

[0024] By adopting the above technical solution, when the driving internal gear rotates, the connecting rod moves in the first connecting groove to drive the limit rod to move, and is inserted into the second connecting groove, thereby completing the insertion of the limit rod. The operation is simple and convenient. By setting the connecting rod and the first connecting groove, the area of ​​the driving internal gear exposed is reduced, thereby reducing the possibility of the driving internal gear being damaged by collision and improving durability.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. By setting up air ducts, shock-absorbing blocks, mounting components, shock-absorbing plates, shock-absorbing springs and sound-absorbing cotton, the shock-absorbing blocks are installed at the installation location of the fresh air system pipe using the mounting components. Sound-absorbing cotton is installed in the air duct to absorb the sound of the air flow. At the same time, the vibration of the air duct during use is reduced by the shock-absorbing plates and shock-absorbing springs, thereby reducing the noise of the fresh air system, performing silencing and improving the indoor living experience; 2. By providing a first pipe, a second pipe, a first assembly block, a second assembly block, an assembly plug block, an assembly slot, a locking block, a first locking groove and a second locking groove, when assembling the first pipe and the second pipe, the first assembly block is attached to the second assembly block, so that the assembly plug block is inserted into the assembly slot, and the locking block passes through the first locking groove and enters the second locking groove, and the second pipe is rotated so that the locking block rotates a certain angle in the second locking groove, thereby locking the first assembly block and the second assembly block, and the assembly of the first pipe and the second pipe is completed, which is simple and convenient to operate and easy to assemble; 3. By setting the first fixed block, the second fixed block, the fixing hole, the auxiliary plate and the rotating block, when the second assembly block is rotated so that the first assembly block and the second assembly block are locked and assembled together, the second fixed block is rotated and closed with the first fixed block. At this time, the first fixed block and the second fixed block are inserted into the fixing hole of the shock-absorbing plate, and the rotating block on the auxiliary plate is rotated so that the first fixed block and the second fixed block are threadedly connected with the fixing hole, and the inner wall of the fixing hole is against the first fixed block and the second fixed block, thereby reducing the possibility of the air duct sliding up and down and front and back. At the same time, through the threaded connection, the possibility of the first fixed block and the second fixed block exiting the fixing hole is reduced, thereby improving the stability of the air duct assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an overall schematic diagram of a fresh air system duct silencing device provided in an embodiment of the present application.

[0027] Figure 2 It is a cross-sectional view used to show the connection relationship between the assembly components and the shock absorbing plate.

[0028] Figure 3 It is a schematic diagram used to show the positional relationship of the air duct and assembly components.

[0029] Figure 4 It is a cross-sectional view used to illustrate the internal structure of the first assembly block.

[0030] Description of reference numerals: 1, air duct; 11, first pipe; 12, second pipe; 13, mounting slot; 14, sound-absorbing cotton; 2, shock-absorbing block; 21, auxiliary plate; 22, shock-absorbing plate; 23, shock-absorbing spring; 24, rotating block; 241, fixing hole; 3, mounting assembly; 31, mounting plate; 32, mounting bolt; 4, assembly assembly; 41, first assembly block; 411, assembly slot; 412, first retaining slot; 413, second retaining slot; 414 , driving groove; 415, first connecting groove; 42, second assembly block; 43, assembly plug-in block; 431, locking block; 44, first fixed block; 441, first limiting groove; 442, second connecting groove; 45, second fixed block; 451, second limiting groove; 5, limiting rod; 51, connecting rod; 6, driving assembly; 61, main driving gear; 611, third locking groove; 62, first driving gear; 63, second driving gear; 64, driving internal gear. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 This application is described in further detail.

[0032] The present application embodiment discloses a duct silencing device for a fresh air system. Figure 1 to Figure 2 , which includes an air duct 1 and a pair of shock-absorbing blocks 2. The shock-absorbing blocks 2 are provided with a mounting assembly 3 for mounting the shock-absorbing blocks 2 on a wall. The mounting assembly 3 includes a mounting plate 31 and a plurality of mounting bolts 32. The shock-absorbing blocks 2 are fixedly arranged on the mounting plate 31. The mounting bolts 32 are used to mount the mounting plate 31 on the wall. An auxiliary plate 21 extending out of the top wall of the shock-absorbing blocks 2 is fixedly arranged on the opposite side of the two shock-absorbing blocks 2. A shock-absorbing plate 22 is slidably arranged on the top wall of the shock-absorbing blocks 2. A shock-absorbing spring 23 is arranged between the shock-absorbing plate 22 and the auxiliary plate 21. The two ends of the shock-absorbing spring 23 are respectively tightly fixed on the shock-absorbing plate 22 and the auxiliary plate 21. The air duct 1 is arranged between the two shock-absorbing plates 22. A mounting groove 13 is arranged through the side wall of the air duct 1. The mounting groove 13 is adapted to be filled with sound-absorbing cotton 14. The sound-absorbing cotton 14 is fixed to the side walls on both sides of the mounting groove 13 by gluing. The vibration of the shock absorbing plate 22 and the air duct 1 is reduced by the shock absorbing spring 23, and the noise of the fresh air system duct is reduced with the sound-absorbing cotton, thereby improving the indoor living experience. For easy maintenance and replacement, refer to Figure 2 and Figure 3The air duct 1 includes a first pipe 11 and a second pipe 12. An assembly component 4 for assembly is arranged between the first pipe 11 and the second pipe 12. The assembly component 4 includes a first assembly block 41, a second assembly block 42 and an assembly plug block 43. The first assembly block 41 and the second assembly block 42 are both annular and are fixedly arranged at both ends of the first pipe 11 or the second pipe 12 respectively. The first assembly block 41 can be abutted against the second assembly block 42, the assembly plug-in block 43 is annular and fixedly arranged on the side wall of the second assembly block 42 close to the first assembly block 41, the side wall of the first assembly block 41 is provided with an assembly slot 411 communicated with the inner wall, the assembly plug-in block 43 can be adapted to be inserted into the assembly slot and rotate in the assembly slot 411, a pair of locking blocks 431 are fixedly arranged on the side wall of the assembly plug-in block 43, the first assembly block 41 is provided with a first locking slot 412 communicated with the assembly slot 411, and the inner wall of the assembly slot 411 is provided with an annular second locking slot 413 communicated with the first locking slot 412, the locking block 431 can pass through the first locking slot 412 and then be inserted into the second locking slot 413 and rotate and move in the second locking slot 413. The first assembly block 41 and the second assembly block 42 are fitted together so that the assembly plug block 43 is inserted into the assembly slot 411, and the locking block 431 passes through the first locking groove 412 and is inserted into the second locking groove 413. The second pipe 12 is rotated so that the locking block 431 moves in the second locking groove 413, and the assembly is completed, which facilitates the disassembly of the air duct 1 for maintenance and replacement.

[0033] To improve the stability of the installation, refer to Figure 2 and Figure 3 A pair of semi-cylindrical first fixing blocks 44 are fixedly provided on the outer wall of the first assembly block 41, and a pair of semi-cylindrical second fixing blocks 45 are fixedly provided on the outer wall of the second assembly block 42. The first fixing block 44 can be abutted against and fitted with the second fixing block 45 to form a cylinder. A cylindrical rotating block 24 is rotatably provided on the shock absorbing plate 22. One end of the rotating block 24 passes through the shock absorbing plate 22, and the other end of the rotating block 24 passes through the auxiliary plate 21. The shock absorbing spring 23 is sleeved on the rotating block 24. The rotating block 24 can rotate on the shock absorbing plate 22, and the rotating block 24 can rotate and move on the auxiliary plate 21. A circular fixing hole 241 is provided on one end of the rotating block 24 close to the shock absorbing plate 22. The first fixing block 44 and the second fixing block 45 can be inserted into the fixing hole 241 and threadedly connected with the fixing hole 241. After assembling the first pipe 11 and the second pipe 12, the first fixing block 44 and the second fixing block 45 are combined into a cylinder, and the first fixing block 44 and the second fixing block 45 are inserted into the fixing hole 241, and the rotating block 24 is rotated so that the first fixing block 44 and the second fixing block 45 are threadedly connected with the fixing hole 241, thereby fixing the air duct 1, and the fixing hole 241 limits the first fixing block 44 and the second fixing block 45, thereby improving the stability of the installation and fixation of the air duct 1.

[0034] To improve the stability of the assembly, refer to Figures 2 to 4The outer wall of the first assembly block 41 is provided with an arc-shaped first connecting groove 415, a connecting rod 51 is slidably provided in the first connecting groove 415, a limiting rod 5 is fixedly provided at the top of the connecting rod 51, the side wall of the first fixed block 44 is provided with a first limiting groove 441 and a second connecting groove 442 which are in communication, and the side wall of the second fixed block 45 away from the first limiting groove 441 is provided with a second limiting groove 451, the connecting rod 51 can be inserted into the second connecting groove 442, and the limiting rod 5 can be inserted into the first limiting groove 441 and the second limiting groove 451. The first assembly block 41 is provided with a driving assembly 6, and the driving assembly 6 is used to drive the limiting rod 5 to move. When assembling the air duct 1, the driving assembly 6 drives the limiting rod 5 to move and insert into the first limiting groove 441 and the second limiting groove 451. The limiting rod 5 moves between the first fixing block 44 and the second fixing block 45, and the moving speed of the limiting rod 5 is slightly smaller than that of the second fixing block 45. The limiting rod 5 is clamped from both ends by the first fixing block 44 and the second fixing block 45. The limiting rod 5 cooperates with the first fixing block 44 and the second fixing block 45 to limit the possibility of the first fixing block 44 and the second fixing block 45 moving, thereby reducing the possibility of the first fixing block 44 and the second fixing block 45 moving, and also reducing the pressure on the outer wall threads of the first fixing block 44 and the second fixing block 45, thereby improving the stability of the assembly.

[0035] For ease of use, refer to Figure 3 and Figure 4 The driving assembly 6 includes a main driving gear 61, a first driving gear 62, a second driving gear 63 and a driving inner gear 64. A driving groove 414 is provided inside the first assembly block 41, which is connected to the second retaining groove 413 and the first connecting groove 415. The first driving gear 62, the second driving gear 63 and the driving inner gear 64 are all rotatably arranged in the driving groove 414, and the outer wall of the driving inner gear 64 is fixedly connected to the connecting rod 51. The second driving gear 63 is meshed and arranged between the first driving gear 62 and the driving inner gear 64, and the number of teeth of the second driving gear 63 is greater than the number of teeth of the first driving gear 62. The center of the main driving gear 61 passes through and is adapted and rotatably arranged in the second retaining groove 413 by means of a clamping connection. The main driving gear 61 is inserted into the driving groove 414 and meshes with the first driving gear 62. The main driving gear 61 is penetrated and provided with a third retaining groove 611 communicating with the inner wall for the retaining block 431 to be adapted and inserted. When the locking block 431 is inserted into the second locking groove 413, the locking block 431 is synchronously inserted into the third locking groove 611. At this time, the second pipe 12 is rotated to push the main driving gear 61 to rotate through the locking block 431. Through the transmission of the first driving gear 62 and the second driving gear 63, the driving internal gear 64 is driven to rotate at a speed slightly slower than the main driving gear 61, thereby driving the limiting rod 5 to rotate, so that after the limiting rod 5 is inserted into the first limiting groove 441, the second limiting groove 451 is sleeved on the limiting rod 5, so that when the first fixed block 44 and the second fixed block 45 are closed, the limiting rod 5 is stuck between the first fixed block 44 and the second fixed block 45.

[0036] The implementation principle of a duct silencer device for a fresh air system in an embodiment of the present application is as follows: during assembly, the first duct 11 is brought close to the second duct 12, so that the first assembly block 41 fits the second assembly block 42, and the locking block 431 passes through the first locking groove 412 and is inserted into the second locking groove 413. At this time, the second duct 12 is rotated, so that the main driving gear 61 is pushed to rotate in the second locking groove 413 through the locking block 431, thereby driving the limiting rod 5 between the first fixing block 44 and the second fixing block 45 to rotate and move at a speed slightly slower than that of the second duct 12 through gear transmission, so that the limiting rod 5 is inserted into the first limiting groove 441 and the second limiting groove 451, and the first fixing block 44 and the second fixing block 45 fit together to form a cylinder, at this time, the shock absorbing plate 22 is pushed to move and compress the shock absorbing spring 23, the first fixing block 44 and the second fixing block 45 are inserted into the fixing hole 241, and the rotating rod is rotated so that the first fixing block 44 and the second fixing block 45 are threadedly connected with the fixing hole 241 to complete the assembly. The sound-absorbing cotton 14 inside the air duct 1 is used to reduce the sound during use. At the same time, the shock-absorbing spring 23 is used for buffering to reduce the vibration of the shock-absorbing plate 22 and the air duct 1, thereby reducing the noise generated by the rotation of the air duct 1 driven by the flow of airflow, thereby reducing the noise of the fresh air system pipeline, achieving the silencing function, and improving the indoor living experience.

[0037] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A silencing device for a fresh air system duct, characterized in that: The invention comprises an air duct (1) and a shock absorbing block (2), wherein the shock absorbing block (2) is provided with a mounting assembly (3), wherein the mounting assembly (3) is used to mount the shock absorbing block (2) on a wall, wherein the shock absorbing block (2) is slidably provided with a shock absorbing plate (22), wherein the shock absorbing block (2) is provided with a shock absorbing spring (23), wherein the shock absorbing spring (23) is arranged between the shock absorbing plate (22) and the shock absorbing block (2) and is connected to the shock absorbing plate (22), wherein the shock absorbing plate (22) is connected to the air duct (1), and wherein the air duct (1) is provided with sound absorbing cotton (14).

2. A fresh air system duct silencing device according to claim 1, characterized in that: The mounting assembly (3) comprises a mounting plate (31) and mounting bolts (32); the mounting plate (31) is arranged on the shock absorbing block (2); and the mounting bolts (32) are used to mount the mounting plate (31) on a wall.

3. A fresh air system duct silencing device according to claim 1, characterized in that: The air duct (1) comprises a first pipe (11) and a second pipe (12); an assembly component (4) is arranged between the first pipe (11) and the second pipe (12); the assembly component (4) is used to assemble the first pipe (11) and the second pipe (12); the first pipe (11) and the second pipe (12) are both provided with a mounting groove (13); and the sound-absorbing cotton (14) is arranged in the mounting groove (13).

4. A fresh air system duct silencing device according to claim 3, characterized in that: The assembly component (4) comprises a first assembly block (41), a second assembly block (42) and an assembly plug-in block (43); the first assembly block (41) is arranged at one end of the first pipe (11) or the second pipe (12); the second assembly block (42) is arranged at the other end of the first pipe (11) or the second pipe (12); the first assembly block (41) can abut against the second assembly block (42); the assembly plug-in block (43) is arranged on the second assembly block (42); the first assembly block (41) is provided with an assembly slot (411); The insert block (43) is inserted into the assembly slot (411) and can rotate in the assembly slot (411); the assembly insert block (43) is provided with a locking block (431); the first assembly block (41) is provided with a first locking groove (412) communicating with the assembly slot (411); the inner wall of the assembly slot (411) is provided with a second locking groove (413) communicating with the first locking groove (412); the locking block (431) can pass through the first locking groove (412) and be inserted into the second locking groove (413) and move in the second locking groove (413).

5. A fresh air system duct silencing device according to claim 4, characterized in that: The first assembly block (41) is provided with a first fixing block (44), the second assembly block (42) is provided with a second fixing block (45), the shock absorbing plate (22) is provided with a fixing hole (241), the first fixing block (44) can be abutted against the second fixing block (45), and the first fixing block (44) and the second fixing block (45) can be inserted into the fixing hole (241).

6. A fresh air system duct silencing device according to claim 5, characterized in that: The shock absorbing block (2) is provided with an auxiliary plate (21); a rotating block (24) is rotatably provided on the shock absorbing plate (22); the rotating block (24) penetrates the shock absorbing plate (22) and is slidably and rotatably connected to the shock absorbing plate (22); the fixing hole (241) is provided on the rotating block (24); the shock absorbing spring (23) is provided between the auxiliary plate (21) and the shock absorbing plate (22); the first fixing block (44) and the second fixing block (45) are inserted into the fixing hole (241) and are threadedly connected to the fixing hole (241).

7. A fresh air system duct silencing device according to claim 6, characterized in that: The damping spring (23) is sleeved on the rotating block (24).

8. A fresh air system duct silencing device according to claim 5, characterized in that: The first assembly block (41) is slidably provided with a limiting rod (5), the first fixing block (44) is provided with a first limiting groove (441), the second fixing block (45) is provided with a second limiting groove (451), the limiting rod (5) can be inserted into the first limiting groove (441) and the second limiting groove (451), the first assembly block (41) is provided with a driving component (6), and the driving component (6) is used to drive the limiting rod (5) to move.

9. A fresh air system duct silencing device according to claim 8, characterized in that: The driving assembly (6) comprises a main driving gear (61), a first driving gear (62), a second driving gear (63) and a driving internal gear (64); the first assembly block (41) is provided with a driving groove (414) communicating with the second locking groove (413); the first driving gear (62), the second driving gear (63) and the driving internal gear (64) are all rotatably arranged in the driving groove (414); the second driving gear (63) is meshedly arranged between the first driving gear (62) and the driving internal gear (64); the center of the main driving gear (61) passes through and is rotatably arranged in the second locking groove (413); the main driving gear (61) is inserted into the driving groove (414) and meshes with the first driving gear (62); the limiting rod (5) is connected to the driving internal gear (64); the main driving gear (61) is provided with a third locking groove (611); the locking block (431) can be inserted into the third locking groove (611).

10. A fresh air system duct silencing device according to claim 9, characterized in that: The first assembly block (41) is provided with a first connecting groove (415) communicating with the driving groove (414); the limiting rod (5) is provided with a connecting rod (51); the connecting rod (51) passes through the first connecting groove (415) and is connected to the driving internal gear (64); the first fixing block (44) is provided with a second connecting groove (442) communicating with the first limiting groove (441) and the first connecting groove (415); the connecting rod (51) can be inserted into the second connecting groove (442).

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