Silencer for airtight exhaust

Abstract

The utility model discloses a silencer for airtight exhaust and belongs to the technical field of silencers, the silencer comprises a shell, an exhaust pipe is fixedly mounted on the shell, an air hole is formed in the outer wall of the exhaust pipe and located in the shell, and a silencing structure is arranged on the outer wall of the air hole and located in the shell in a sleeving mode. The silencing structure comprises a first silencing cotton layer arranged on the outer wall of the exhaust pipe in a sleeving mode. By arranging a silencing structure and the like, after high-pressure compressed air sequentially passes through an exhaust pipe and a plurality of air holes, pressure begins to be dispersed in a large-diameter shell, a first silencing cotton layer, a first filter screen layer, a second silencing cotton layer, a second filter screen layer and the like are used in cooperation, air collides with one another and counteracts one another, the pressure is gradually reduced, and noise is also gradually reduced; therefore, the problem that after an existing airtight test is finished, compressed air in an air cylinder is directly discharged through a pipeline, and ears of people are directly injured is solved, and the body health of people is protected.

Description

Technical Field

[0001] This application relates to the technical field of mufflers, and specifically to a muffler for airtight exhaust. Background Art

[0002] An airtight test, also known as a leak tightness test or leak detection, mainly aims to verify the sealing performance of a pressure vessel or other closed system to ensure no gas leakage. The airtight test is widely used in various industrial fields, including but not limited to chemical industry, petroleum, natural gas, aerospace, and automobile manufacturing, etc.

[0003] During the existing airtight test, compressed air of 2.1 - 2.3 MPA is filled in the gas cylinder. When the experiment is over, the compressed air in the gas cylinder is directly discharged through the pipeline. The instantaneous noise during discharge can reach 110 - 120 decibels, which can directly damage people's ears and cause harm to people's bodies.

[0004] Therefore, this application provides a muffler for airtight exhaust to solve the above problems. Utility Model Content

[0005] This application provides a muffler for airtight exhaust, aiming to solve the problems that when the existing airtight test is over and the compressed air in the gas cylinder is directly discharged through the pipeline, it will directly damage people's ears and cause harm to people's bodies as mentioned in the background art.

[0006] To achieve the above object, this application provides the following technical solution: A muffler for airtight exhaust, including a housing, an exhaust pipe is fixedly installed on the housing, air holes are opened on the outer wall of the exhaust pipe and inside the housing, and a sound absorption structure is sleeved on the outer wall of the air holes and inside the housing;

[0007] The sound absorption structure includes a first sound absorption cotton layer sleeved on the outer wall of the exhaust pipe, a first filter screen layer is adhered to the outer wall of the first sound absorption cotton layer, a second sound absorption cotton layer is adhered to the first filter screen layer, and a second filter screen layer is adhered to the outer wall of the second sound absorption cotton layer. By setting the sound absorption structure, etc., using the first sound absorption cotton layer, the first filter screen layer, the second sound absorption cotton layer, and the second filter screen layer in cooperation, the air collides with each other and cancels each other out, the pressure gradually decreases, and the noise also gradually decreases, thus avoiding the problem that when the existing airtight test is over and the compressed air in the gas cylinder is directly discharged through the pipeline, it will directly damage people's ears.

[0008] Preferably, a front cover plate is installed on the port of the housing, an installation hole is opened at the center position of the front cover plate, and one end of the exhaust pipe passes through the installation hole and extends to the outside of the housing and is fixedly connected to the front cover plate.

[0009] Preferably, a plurality of air holes are provided, and the plurality of air holes are distributed on the exhaust pipe in a circumferential array along the transverse direction of the exhaust pipe.

[0010] Preferably, a rear cover plate is installed at one end of the exhaust pipe away from the front cover plate, and the rear cover plate is respectively connected to one ends of the first sound-absorbing cotton layer, the first filter screen layer, the second sound-absorbing cotton layer and the second filter screen layer away from the front cover plate.

[0011] Preferably, a sealing net is installed at the port of the housing away from the front cover plate, and the sealing net is connected to the rear cover plate.

[0012] Preferably, the first sound-absorbing cotton layer, the first filter screen layer, the second sound-absorbing cotton layer and the second filter screen layer are arranged in a cylindrical structure.

[0013] Beneficial effects: By setting a sound-absorbing structure, etc., after the high-pressure compressed air passes through the exhaust pipe and a plurality of air holes in sequence, the pressure begins to disperse in the large-diameter housing. With the combined use of the first sound-absorbing cotton layer, the first filter screen layer, the second sound-absorbing cotton layer and the second filter screen layer, the air collides with each other and cancels each other out, the pressure gradually decreases, and the noise also gradually decreases. Thus, it avoids the problem that when the compressed air in the gas cylinder is directly discharged through the pipeline after the existing airtight test experiment, it will directly damage people's ears, and protects people's physical health. Description of the Drawings

[0014] Figure 1 It is a schematic cross-sectional structure diagram of a muffler for airtight exhaust;

[0015] Figure 2 It is a schematic southeast isometric structure diagram of a muffler for airtight exhaust;

[0016] Figure 3 It is a schematic partial cross-sectional and disassembled structure diagram of a muffler for airtight exhaust;

[0017] Figure 4 It is a schematic northwest isometric structure diagram of a muffler for airtight exhaust;

[0018] Figure 5 It is a schematic structure diagram of the exhaust pipe and air holes of a muffler for airtight exhaust.

[0019] In the figure: 1. Housing; 11. Front cover plate; 111. Mounting hole; 2. Exhaust pipe; 3. Air hole; 4. Sound-absorbing structure; 41. First sound-absorbing cotton layer; 42. First filter screen layer; 43. Second sound-absorbing cotton layer; 44. Second filter screen layer; 5. Rear cover plate; 6. Sealing net. Detailed Embodiments

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0021] Embodiment 1

[0022] This embodiment provides a silencer for airtight exhaust, as Figures 1-5 shown. The silencer includes a housing 1, an exhaust pipe 2 is fixedly installed on the housing 1, air holes 3 are opened on the outer wall of the exhaust pipe 2 and inside the housing 1, and a silencing structure 4 is sleeved on the outer wall of the air holes 3 and inside the housing 1;

[0023] The silencing structure 4 includes a first sound-absorbing cotton layer 41 sleeved on the outer wall of the exhaust pipe 2, a first filter screen layer 42 is adhered to the outer wall of the first sound-absorbing cotton layer 41, a second sound-absorbing cotton layer 43 is adhered to the first filter screen layer 42, and a second filter screen layer 44 is adhered to the outer wall of the second sound-absorbing cotton layer 43.

[0024] During use, the exhaust silencer is connected to the inflation port of the gas cylinder through a valve. When it is necessary to inflate and test the gas cylinder, the exhaust end is closed; after the gas cylinder test is completed, the inflation valve is closed and the exhaust valve is opened for exhaust. During exhaust, high-pressure compressed air enters the silencer through the exhaust pipe 2. After passing through a number of air holes 3 on the exhaust pipe 2, the pressure begins to disperse inside the large-diameter housing 1. During the process of passing through the first sound-absorbing cotton layer 41, the first filter screen layer 42, the second sound-absorbing cotton layer 43, and the second filter screen layer 44, the air collides with each other and cancels each other out, and the instantaneous noise is reduced to below 80 decibels. The pressure gradually decreases, and the noise also gradually decreases. Thus, it avoids the problem that when the compressed air in the gas cylinder is directly discharged through the pipeline after the existing airtight test experiment, it will directly damage people's ears and protects people's physical health.

[0025] In this embodiment, a front cover plate 11 is installed on the port of the housing 1. An installation hole 111 is opened at the center position of the front cover plate 11. One end of the exhaust pipe 2 passes through the installation hole 111 and extends to the outside of the housing 1 and is fixedly connected to the front cover plate 11; a number of air holes 3 are provided, and the number of air holes 3 are distributed in a circumferential array along the transverse direction of the exhaust pipe 2 on the exhaust pipe 2;

[0026] Among them, through the distribution of a number of air holes 3 in a circumferential array along the transverse direction of the exhaust pipe 2 on the exhaust pipe 2, the high-pressure compressed air in the exhaust pipe 2 can quickly disperse the pressure through a number of air holes 3 after passing through the number of air holes 3, realizing a fast silencing function and better silencing effect;

[0027] In this embodiment, a rear cover plate 5 is installed at one end of the exhaust pipe 2 away from the front cover plate 11, and the rear cover plate 5 is respectively connected to one ends of the first sound-absorbing cotton layer 41, the first filter screen layer 42, the second sound-absorbing cotton layer 43 and the second filter screen layer 44 away from the front cover plate 11;

[0028] Among them, by installing the rear cover plate 5 at one end of the exhaust pipe 2 away from the front cover plate 11, the lateral position of the sound-absorbing structure 4 can be fixed, avoiding the sound-absorbing structure 4 running during the sound-absorbing process when it is impacted by strong compressed air, ensuring the stable sound-absorbing and noise-reducing effects of the muffler;

[0029] In this embodiment, a sealing net 6 is installed at the port of the housing 1 away from the front cover plate 11, the sealing net 6 is connected to the rear cover plate 5, and the first sound-absorbing cotton layer 41, the first filter screen layer 42, the second sound-absorbing cotton layer 43 and the second filter screen layer 44 are arranged in a cylindrical structure;

[0030] Among them, by arranging the first sound-absorbing cotton layer 41, the first filter screen layer 42, the second sound-absorbing cotton layer 43 and the second filter screen layer 44 in a cylindrical structure, the sound-absorbing structure 4 can completely wrap a plurality of air holes 3 on the exhaust pipe 2. When the compressed air is dispersed into the interior of the housing 1 through the plurality of air holes 3, the sound-absorbing structure 4 can comprehensively reduce the pressure of the compressed air dispersed by the plurality of air holes 3, achieving the functions of effective noise reduction and effect.

[0031] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application, according to the technical solution and its concept of the present application, makes equivalent substitutions or changes, and should be covered by the protection scope of the present application.

Claims

1. A silencer for airtight exhaust, comprising a housing (1), characterized in that: An exhaust pipe (2) is fixedly mounted on the outer shell (1); an air hole (3) is provided on the outer wall of the exhaust pipe (2) and located inside the outer shell (1); and a silencer structure (4) is mounted on the outer wall of the air hole (3) and located inside the outer shell (1); The noise reduction structure (4) comprises a first noise reduction cotton layer (41) sleeved on the outer wall of the exhaust pipe (2), a first filter mesh layer (42) adhered to the outer wall of the first noise reduction cotton layer (41), a second noise reduction cotton layer (43) adhered to the first filter mesh layer (42), and a second filter mesh layer (44) adhered to the outer wall of the second noise reduction cotton layer (43).

2. The muffler for airtight exhaust according to claim 1, characterized in that: A front cover plate (11) is installed on the port of the housing (1), a mounting hole (111) is provided at the center of the front cover plate (11), and one end of the exhaust pipe (2) passes through the mounting hole (111) and extends to the outside of the housing (1) and is fixedly connected to the front cover plate (11).

3. The muffler for airtight exhaust according to claim 1, characterized in that: A plurality of the air holes (3) are provided, and the plurality of the air holes (3) are distributed on the exhaust pipe (2) in a circular array along the transverse direction of the exhaust pipe (2).

4. The muffler for airtight exhaust according to claim 2, characterized in that: A rear cover plate (5) is installed at one end of the exhaust pipe (2) away from the front cover plate (11), and the rear cover plate (5) is respectively connected to the first sound-absorbing cotton layer (41), the first filter mesh layer (42), the second sound-absorbing cotton layer (43), and one end of the second filter mesh layer (44) away from the front cover plate (11).

5. The muffler for airtight exhaust according to claim 2, characterized in that: A sealing net (6) is installed at a port of the housing (1) away from the front cover plate (11), and the sealing net (6) is connected to the rear cover plate (5).

6. The muffler for airtight exhaust according to claim 1, characterized in that: The first sound-absorbing cotton layer (41), the first filter mesh layer (42), the second sound-absorbing cotton layer (43) and the second filter mesh layer (44) are arranged in a cylindrical structure.

Images