Noise reduction and shock absorption mounting assembly for central air conditioner

By designing adjustable bottom and side vibration damping mounting mechanisms, combined with a shielding and noise reduction structure, the problems of inflexible installation and poor vibration and noise reduction effects of central air conditioning outdoor units have been solved, achieving stable installation and all-round vibration and noise reduction for outdoor units of different specifications.

CN224065668UActive Publication Date: 2026-03-31BEIJING ZHENXING HUALONG REFRIGERATION ENG GRP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-05-08
Publication Date
2026-03-31

AI Technical Summary

Technical Problem

Existing central air conditioning mounting brackets cannot be flexibly adjusted, can only install outdoor units of one size, and have poor vibration damping and noise reduction effects, making them prone to being loosely fixed.

Method used

An installation assembly was designed, which includes bottom and side vibration damping mounting mechanisms as well as a noise reduction and shielding mechanism. Through adjustable sliders, screws, and rubber vibration damping seats, a stable installation and all-round vibration damping and noise reduction of the outdoor unit of a central air conditioner can be achieved.

Benefits of technology

It enables stable installation of outdoor units of different specifications, improves vibration reduction and noise reduction effects, and avoids noise affecting the indoor environment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of central air conditioner installation, and particularly relates to a central air conditioner noise reduction and shock absorption installation assembly which comprises an installation plate fixedly connected to an outer wall, two bottom shock absorption installation mechanisms are arranged on one side of the installation plate, and a central air conditioner outdoor unit is arranged at the tops of the two bottom shock absorption installation mechanisms. Two side damping mounting mechanisms are arranged on one side of the mounting plate, and the central air conditioner outdoor unit is arranged between the two side damping mounting mechanisms. The central air conditioner outdoor unit is reasonable in structural design, the central air conditioner outdoor unit can be comprehensively installed and fixed through the arrangement of the bottom damping installation mechanism and the side damping installation mechanism, the installation stability is improved, meanwhile, the damping and noise reduction effects are better through side face damping and bottom damping, and the noise reduction effect is better through the arrangement of the upper sound insulation board and the side sound insulation board. And the noise reduction effect can be further improved, and the indoor living environment is prevented from being affected by too large noise.
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Description

Technical Field

[0001] This utility model relates to the field of central air conditioning installation technology, and in particular to a noise reduction and vibration damping installation component for central air conditioning. Background Technology

[0002] A central air conditioning system consists of one or more cold / heat source systems and multiple air conditioning systems. Unlike traditional refrigerant-based air conditioners (such as stand-alone units or VRV systems), which centrally process air to achieve comfort requirements, this system uses the principle of liquid vaporization refrigeration to provide the necessary cooling capacity to offset the heat load of the indoor environment. The heating system provides the necessary heat to offset the heating / cooling load of the indoor environment. Currently, traditional central air conditioning outdoor units need to be installed outdoors.

[0003] A search revealed a portable central air conditioning mounting bracket with authorization announcement number CN216790499U, comprising a mounting bracket and a wall. The mounting bracket is slidably connected to the wall. The mounting bracket has a shock absorption and noise reduction component on its inner side, bolts on its outer side, and a sealing component on its inner side, which includes a limit rod and a push plate.

[0004] However, the aforementioned central air conditioning mounting brackets have shortcomings in use. The mounting brackets are relatively fixed and inconvenient to adjust, which means they can only be used to install and reduce vibration and noise of a central air conditioning outdoor unit of one size, greatly reducing the practicality of the device. Moreover, installing vibration and noise reduction only from the bottom not only makes it easy for the device to be not securely fixed, but also reduces the effect of vibration and noise reduction. Therefore, we propose a noise reduction and vibration damping installation component for central air conditioning to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to solve the above-mentioned shortcomings and to propose a noise reduction and vibration damping installation component for central air conditioning.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A noise reduction and vibration damping installation assembly for a central air conditioning system includes a mounting plate fixedly connected to an exterior wall. Two bottom vibration damping mounting mechanisms are provided on one side of the mounting plate, and a central air conditioning outdoor unit is provided on top of the two bottom vibration damping mounting mechanisms. Two side vibration damping mounting mechanisms are provided on one side of the mounting plate, and the central air conditioning outdoor unit is disposed between the two side vibration damping mounting mechanisms. A noise reduction and shielding mechanism is provided between the mounting plate and the central air conditioning outdoor unit.

[0008] As a preferred embodiment of this utility model, the bottom shock-absorbing mounting mechanism includes a slide rail fixedly connected to one side of the mounting plate, a reinforcing plate fixedly connected between the mounting plate and the slide rail, a plurality of threaded grooves on the top of the slide rail, two sliders slidably fitted inside the slide rail, a fixing plate fixedly connected to the top of the sliders, four screws threadedly connected to the top of the fixing plate, each screw threaded into a corresponding threaded groove, a rubber shock-absorbing seat fixedly connected to the top of the fixing plate, a cylinder fixedly connected to the top of the rubber shock-absorbing seat, two rubber pads slidably fitted inside the cylinder, a common shock-absorbing spring fixedly connected between the two rubber pads, a sliding rod fixedly connected to the top of the upper rubber pad, a connecting plate fixedly connected to the top of the sliding rod, and the connecting plate fixedly connected to the bottom of the central air conditioning outdoor unit by two screws.

[0009] As a preferred embodiment of this utility model, the same guide rod is fixedly connected to the inner walls of both sides of the slide rail, and both sliders are slidably sleeved inside the guide rod.

[0010] As a preferred embodiment of this utility model, a support plate is fixedly connected to the bottom of the lower rubber pad, and a pull rod is fixedly connected to both sides of the support plate. Nuts are threaded on the outer side of the pull rods, and the two nuts are respectively movably abutting against the two sides of the cylinder. Elongated holes are opened on both sides of the cylinder, and the two pull rods are respectively slidably sleeved in the corresponding elongated holes.

[0011] As a preferred embodiment of this utility model, the mounting plate has multiple upper threaded grooves on one side, the side shock-absorbing mounting mechanism includes a shock-absorbing pad, a side plate is fixedly connected to the front side of the shock-absorbing pad, a frame is fixedly connected to one side of the side plate, two movable plates are slidably sleeved in the frame, a threaded rod is threadedly connected to the front side of the movable plate, a pressure plate is fixedly connected to the rear end of the threaded rod, a rubber plate is fixedly connected to the inner side of the pressure plate, and two screws are threadedly connected to one side of the side plate, with the two screws respectively threaded into the corresponding upper threaded grooves.

[0012] As a preferred embodiment of this invention, a knob is fixedly connected to the front end of the threaded rod.

[0013] As a preferred embodiment of this utility model, limit grooves are provided on the upper and lower inner walls of the frame, and two limit blocks are slidably sleeved in the limit grooves. The four limit blocks are respectively fixedly connected to the upper and lower surfaces of the corresponding moving plates.

[0014] As a preferred embodiment of this utility model, the noise reduction and shielding mechanism includes a groove formed on the top of the mounting plate, an upper sound insulation plate slidably sleeved in the groove, two side sound insulation plates fixedly connected to the bottom of the upper sound insulation plate, two screws threadedly connected to one side of the mounting plate, and the upper sound insulation plate fixedly connected to the groove by the two screws.

[0015] In this utility model, a noise reduction and vibration damping installation component for central air conditioning is described. Based on the size of the outdoor unit of the central air conditioning unit, screw one is loosened so that it extends out of the lower threaded groove, thus not fixing the fixing plate. At this point, the positions of the slider and cylinder can be adjusted. After adjustment, screw one is tightened so that it screws into the corresponding lower threaded groove, thus fixing the fixing plate. Then, the outdoor unit of the central air conditioning unit is fixed to the four connecting plates. Based on the height of the outdoor unit, screw two is screwed into the corresponding upper threaded groove, thus fixing the side plate and frame. Based on the left and right length of the outdoor unit, the sliding plate can be adjusted to change the distance between the two sliding plates, allowing for clamping and fixing of outdoor units of different lengths. Then, the threaded rod is tightened, causing the threaded rod to move the pressure plate and rubber plate inward and abut against the front and rear sides of the outdoor unit. Finally, the upper sound insulation plate is fixed to the mounting plate and the top of the outdoor unit using two screws three.

[0016] In this utility model, a noise reduction and vibration damping installation component for central air conditioning is described. When the outdoor unit of the central air conditioning unit vibrates during operation, the rubber pads, damping springs, and rubber damping seats can dampen the bottom of the outdoor unit. When the elasticity of the damping spring weakens after long-term use, the two nuts can be loosened so that the pull rod and support plate are not fixed. Pulling the pull rod and support plate upwards can compress the damping spring, allowing the spring to regain its elasticity and ensuring the damping effect. Finally, the nuts are tightened so that they are firmly against the outside of the cylinder. The damping pads and rubber plates can dampen the outdoor unit from the side, greatly improving the damping and noise reduction effect and enabling the outdoor unit to operate stably. The upper sound insulation plate can provide sun and rain protection for the outdoor unit. At the same time, the upper and side sound insulation plates can isolate the sound emitted by the outdoor unit, achieving a noise reduction effect and preventing excessive noise from affecting the indoor living environment.

[0017] This utility model has a reasonable structural design. With the bottom shock-absorbing installation mechanism and the side shock-absorbing installation mechanism, the central air conditioning outdoor unit can be installed and fixed in a comprehensive manner, improving the stability of the installation. At the same time, the side and bottom shock absorption makes the shock absorption and noise reduction effect better. With the setting of the upper sound insulation plate and the side sound insulation plate, the noise reduction effect can be further improved, avoiding excessive noise from affecting the indoor living environment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a noise reduction and vibration damping installation component for a central air conditioning system proposed in this utility model;

[0019] Figure 2 This is a partial cross-sectional view of a slide rail for a noise reduction and vibration damping installation component for a central air conditioning system, as proposed in this utility model.

[0020] Figure 3 for Figure 2 A schematic diagram of the structure of part A;

[0021] Figure 4 This is a schematic diagram of the side vibration damping installation mechanism for a noise reduction and vibration damping installation component for a central air conditioning system, as proposed in this utility model.

[0022] Figure 5 This is a schematic diagram of the structure of a noise reduction and damping mechanism for a central air conditioning noise reduction and vibration damping installation component proposed in this utility model.

[0023] In the diagram: 1. Mounting plate; 2. Bottom vibration damping mounting mechanism; 3. Central air conditioning outdoor unit; 4. Side vibration damping mounting mechanism; 5. Noise reduction and shielding mechanism; 201. Reinforcing plate; 202. Slide rail; 203. Lower threaded groove; 204. Guide rod; 205. Slider; 206. Fixing plate; 207. Screw 1; 208. Rubber vibration damping seat; 209. Connecting plate; 210. Slide rod; 211. Cylinder body; 212. 213. Long hole; 214. Pull rod; 215. Nut; 216. Support plate; 217. Rubber pad; 218. Shock-absorbing spring; 40. Rubber plate; 41. Upper threaded groove; 42. Shock-absorbing pad; 43. Side plate; 44. Screw two; 45. Frame; 46. Threaded rod; 47. Moving plate; 48. Limiting block; 49. Pressure plate; 51. Groove; 52. Screw three; 53. Upper sound insulation plate; 54. Side sound insulation plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Reference Figures 1-5 A noise reduction and vibration damping installation component for a central air conditioning unit includes a mounting plate 1 fixedly connected to an exterior wall. Two bottom vibration damping mounting mechanisms 2 are provided on one side of the mounting plate 1. A central air conditioning unit 3 is provided on the top of the two bottom vibration damping mounting mechanisms 2. Two side vibration damping mounting mechanisms 4 are provided on one side of the mounting plate 1. The central air conditioning unit 3 is located between the two side vibration damping mounting mechanisms 4. A noise reduction and shielding mechanism 5 is provided between the mounting plate 1 and the central air conditioning unit 3.

[0026] Furthermore, the bottom shock-absorbing mounting mechanism 2 includes a slide rail 202 fixedly connected to one side of the mounting plate 1. A reinforcing plate 201 is fixedly connected between the mounting plate 1 and the slide rail 202. The top of the slide rail 202 has several threaded grooves 203. Two sliders 205 are slidably sleeved inside the slide rail 202. A fixing plate 206 is fixedly connected to the top of the sliders 205. Four screws 207 are threadedly connected to the top of the fixing plate 206. The screws 207 are threaded into the corresponding threaded grooves 203. A rubber shock absorber 208 is fixedly connected to the top of the fixed plate 206. A cylinder 211 is fixedly connected to the top of the rubber shock absorber 208. Two rubber pads 216 are slidably sleeved inside the cylinder 211. The same shock-absorbing spring 217 is fixedly connected between the two rubber pads 216. A slide rod 210 is fixedly connected to the top of the upper rubber pad 216. A connecting plate 209 is fixedly connected to the top of the slide rod 210. The connecting plate 209 is fixedly connected to the bottom of the central air conditioning outdoor unit 3 by two screws.

[0027] Using the above method: Loosen screw 207 so that screw 207 is unscrewed from the lower threaded groove 203, thus not fixing the fixing plate 206. At this time, the positions of slider 205 and cylinder 211 can be adjusted. After adjustment, tighten screw 207 so that screw 207 is screwed into the corresponding lower threaded groove 203, thus fixing the fixing plate 206. Then fix the central air conditioner outdoor unit 3 on the four connecting plates 209. Through the setting of rubber pad 216, shock-absorbing spring 217 and rubber shock-absorbing seat 208, the bottom of the central air conditioner outdoor unit 3 can be damped.

[0028] Furthermore, the same guide rod 204 is fixedly connected to the inner walls on both sides of the slide rail 202, and the two sliders 205 are slidably sleeved in the guide rod 204 to facilitate the guidance of the sliders 205.

[0029] Furthermore, a support plate 215 is fixedly connected to the bottom of the lower rubber pad 216. A pull rod 213 is fixedly connected to both sides of the support plate 215. Nuts 214 are threaded on the outer side of the pull rod 213. The two nuts 214 are respectively movably abutting against the two sides of the cylinder 211. The cylinder 211 has elongated holes 212 on both sides. The two pull rods 213 are respectively slidably fitted into the corresponding elongated holes 212. When the elasticity of the shock-absorbing spring 217 weakens after long-term use, the two nuts 214 can be loosened so that the pull rod 213 is not fixed to the support plate 215. Pulling the pull rod 213 and the support plate 215 upward will compress the shock-absorbing spring 217, so that the elasticity of the shock-absorbing spring 217 is restored, ensuring the shock absorption effect. Finally, tighten the nuts 214 so that the nuts 214 are firmly abutting against the outer side of the cylinder 211.

[0030] Furthermore, refer to Figure 1 , Figure 4 and Figure 5 The mounting plate 1 has multiple upper threaded grooves 41 on one side. The side shock-absorbing mounting mechanism 4 includes a shock-absorbing pad 42. The front side of the shock-absorbing pad 42 is fixedly connected to a side plate 43. One side of the side plate 43 is fixedly connected to a frame 45. Two movable plates 47 are slidably sleeved inside the frame 45. The front side of the movable plate 47 is threadedly connected to a threaded rod 46. The rear end of the threaded rod 46 is fixedly connected to a pressure plate 49. The inner side of the pressure plate 49 is fixedly connected to a rubber plate 40. One side of the side plate 43 is threadedly connected to two screws 44. The two screws 44 are respectively threaded into the corresponding upper threaded grooves 41.

[0031] Using the above scheme: Based on the height of the central air conditioning outdoor unit 3, screw 44 is screwed into the upper threaded groove 41 of the corresponding height, thereby fixing the side plate 43 to the frame 45. Based on the left and right length of the central air conditioning outdoor unit 3, the sliding plate 47 is slidable to adjust the distance between the two sliding plates 47, so as to clamp and fix central air conditioning outdoor units 3 of different lengths. Then, the threaded rod 46 is tightened, so that the threaded rod 46 drives the pressure plate 49 and the rubber plate 40 to move inward and abut against the front and rear sides of the central air conditioning outdoor unit 3. Finally, the upper sound insulation plate 53 is fixed to the top of the mounting plate 1 and the central air conditioning outdoor unit 3 by two screws 52. Through the setting of the shock-absorbing pad 42 and the rubber plate 40, the central air conditioning outdoor unit 3 can be shock-absorbing from the side, greatly improving the effect of shock absorption and noise reduction.

[0032] Furthermore, a knob is fixedly connected to the front end of the threaded rod 46 to facilitate the rotation of the threaded rod 46.

[0033] Furthermore, limit grooves are provided on the upper and lower inner walls of the frame 45, and two limit blocks 48 are slidably sleeved in the limit grooves. The four limit blocks 48 are respectively fixedly connected to the upper and lower surfaces of the corresponding moving plates 47, so as to facilitate the guidance of the moving plates 47 and make their movement more stable.

[0034] Furthermore, refer to Figure 1 and Figure 5 The noise reduction and shielding mechanism 5 includes a groove 51 on the top of the mounting plate 1. An upper sound insulation plate 53 is slidably sleeved in the groove 51. Two side sound insulation plates 54 are fixedly connected to the bottom of the upper sound insulation plate 53. Two screws 52 are threadedly connected to one side of the mounting plate 1. The upper sound insulation plate 53 is fixedly connected to the groove 51 by the two screws 52.

[0035] The above solution is adopted: by setting the upper sound insulation panel 53, the central air conditioner outdoor unit 3 can be shaded and protected from rain. At the same time, by setting the upper sound insulation panel 53 and the side sound insulation panel 54, the sound emitted by the central air conditioner outdoor unit 3 can be isolated, which can reduce noise and prevent excessive noise from affecting the indoor living environment.

[0036] In this invention, based on the size of the central air conditioning outdoor unit 3, loosen screw 207 so that it extends out of the lower threaded groove 203, thus not fixing the fixing plate 206. At this point, the positions of the slider 205 and the cylinder 211 can be adjusted. After adjustment, tighten screw 207 so that it screws into the corresponding lower threaded groove 203, thus fixing the fixing plate 206. Then, fix the central air conditioning outdoor unit 3 onto the four connecting plates 209. Based on the height of the central air conditioning outdoor unit 3, screw 44 into the corresponding connecting plate. The upper threaded groove 41 of the appropriate height is used to fix the side plate 43 and the frame 45. According to the left and right length of the central air conditioning outdoor unit 3, the sliding moving plate 47 can be adjusted to adjust the distance between the two moving plates 47 so as to clamp and fix the central air conditioning outdoor unit 3 of different lengths. Then tighten the threaded rod 46, so that the threaded rod 46 drives the pressure plate 49 and the rubber plate 40 to move inward and abut against the front and rear sides of the central air conditioning outdoor unit 3. Finally, the upper sound insulation plate 53 is fixed to the top of the mounting plate 1 and the central air conditioning outdoor unit 3 by two screws 52.

[0037] When the outdoor unit 3 of the central air conditioner vibrates during operation, the bottom of the outdoor unit 3 can be damped by the rubber pad 216, the shock-absorbing spring 217, and the rubber shock-absorbing seat 208. After prolonged use, when the elasticity of the shock-absorbing spring 217 weakens, the two nuts 214 can be loosened to prevent them from fixing the pull rod 213 and the support plate 215. Pulling the pull rod 213 and the support plate 215 upwards will compress the shock-absorbing spring 217, restoring its elasticity and ensuring the damping effect. Finally, tighten the nuts 216 and 208. 14, so that the nut 214 is firmly abutted against the outside of the cylinder 211. Through the setting of the shock-absorbing pad 42 and the rubber plate 40, the central air conditioner outdoor unit 3 can be shock-absorbing from the side, which greatly improves the effect of shock absorption and noise reduction, so that the central air conditioner outdoor unit 3 can operate stably. Through the setting of the upper sound insulation plate 53, the central air conditioner outdoor unit 3 can be shaded and rainproofed. At the same time, through the setting of the upper sound insulation plate 53 and the side sound insulation plate 54, the sound emitted by the central air conditioner outdoor unit 3 can be isolated, which has the effect of noise reduction and avoids excessive noise from affecting the indoor living environment.

Claims

1. A noise reduction and shock absorption mounting assembly for central air conditioning, characterized in that, The application relates to a central air conditioner outer machine fixing device, which comprises a mounting plate (1) fixedly connected to an outer wall, two bottom damping mounting mechanisms (2) arranged on one side of the mounting plate (1), a central air conditioner outer machine (3) arranged on the top of the two bottom damping mounting mechanisms (2), two side damping mounting mechanisms (4) arranged on one side of the mounting plate (1), and a shielding and noise reduction mechanism (5) arranged between the mounting plate (1) and the central air conditioner outer machine (3).

2. The noise reduction and vibration damping mounting assembly for a central air conditioner of claim 1, wherein, The bottom damping mounting mechanism (2) comprises a slide rail (202) fixedly connected to one side of the mounting plate (1), a reinforcing plate (201) fixedly connected between the mounting plate (1) and the slide rail (202), a plurality of lower threaded grooves (203) formed in the top of the slide rail (202), two slide blocks (205) slidably sleeved in the slide rail (202), a fixed plate (206) fixedly connected to the top of the slide block (205), four screws (207) threadedly connected to the top of the fixed plate (206), the screws (207) being threadedly connected into the corresponding lower threaded grooves (203), a rubber damping seat (208) fixedly connected to the top of the fixed plate (206), a cylinder (211) fixedly connected to the top of the rubber damping seat (208), two rubber pads (216) slidably sleeved in the cylinder (211), a damping spring (217) fixedly connected between the two rubber pads (216), a slide rod (210) fixedly connected to the top of the upper rubber pad (216), a connecting plate (209) fixedly connected to the bottom of the central air conditioner outer machine (3) through two screw rods, and the connecting plate (209) being fixedly connected to the top of the slide rod (210).

3. The noise reduction and vibration dampening mounting assembly for a central air conditioner of claim 2, wherein, The two side inner walls of the slide rail (202) are fixedly connected with a same guide rod (204), and the two slide blocks (205) are slidably sleeved in the guide rod (204).

4. The noise reduction and vibration dampening mounting assembly for a central air conditioner of claim 2, wherein, The bottom of the lower rubber pad (216) is fixedly connected with a supporting disc (215), the two sides of the supporting disc (215) are fixedly connected with pull rods (213), the outer sides of the pull rods (213) are threadedly sleeved with nuts (214), the two nuts (214) are respectively movably abutted against the two sides of the cylinder (211), the two sides of the cylinder (211) are provided with long strip holes (212), and the two pull rods (213) are slidably sleeved in the corresponding long strip holes (212).

5. The noise reduction and vibration dampening mounting assembly for a central air conditioner of claim 1, wherein, The side of the mounting plate (1) is provided with a plurality of upper threaded grooves (41), the side damping mounting mechanism (4) comprises a damping pad (42), the front side of the damping pad (42) is fixedly connected with a side plate (43), one side of the side plate (43) is fixedly connected with a frame (45), two movable plates (47) are slidably sleeved in the frame (45), the front side of the movable plate (47) is threadedly connected with a threaded rod (46), the rear end of the threaded rod (46) is fixedly connected with a pressing plate (49), the inner side of the pressing plate (49) is fixedly connected with a rubber plate (40), one side of the side plate (43) is threadedly connected with two screws two (44), and the two screws two (44) are respectively threadedly connected in the corresponding upper threaded grooves (41).

6. The noise reduction and vibration dampening mounting assembly for a central air conditioner of claim 5, wherein, The front end of the threaded rod (46) is fixedly connected with a knob.

7. The noise reduction and vibration dampening mounting assembly for a central air conditioner of claim 5, wherein, The upper and lower inner walls of the frame (45) are provided with limiting grooves, two limiting blocks (48) are slidably sleeved in the limiting grooves, and four limiting blocks (48) are respectively fixedly connected to the upper and lower surfaces of the corresponding movable plates (47).

8. The noise reduction and vibration dampening mounting assembly for a central air conditioner of claim 1, wherein, The shielding and noise reduction mechanism (5) comprises a groove (51) formed in the top of the mounting plate (1), an upper sound insulation plate (53) is slidably sleeved in the groove (51), the bottom of the upper sound insulation plate (53) is fixedly connected with two side sound insulation plates (54), one side of the mounting plate (1) is threadedly connected with two screws three (52), and the upper sound insulation plate (53) is fixedly connected in the groove (51) through the two screws three (52).