Multi-section silencer
By designing a multi-segment silencer, utilizing a multi-layered silencing structure and resonant cavity, the problem of poor silencing effect in PSA nitrogen generators is solved, achieving efficient noise reduction and exhaust gas discharge, ensuring a safe working environment and convenient installation.
Patent Information
- Application Number
- CN202423143537.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-19
AI Technical Summary
Existing silencers are not effective at reducing noise in PSA nitrogen generators, especially in large equipment. Traditional silencers are prone to damage or blockage after long-term operation, resulting in poor noise reduction.
Design a multi-stage silencer comprising an intake chamber, a silencer chamber, and an exhaust chamber, with multiple layers of silencer structure and a resonant cavity. Use a combination of silencer materials and resonant cavities. Gas passes through multiple layers of silencer treatment, including a flow guide plate and a Helmholtz resonant cavity, combined with sound-absorbing cotton and sound insulation panels to achieve multi-stage silencer.
It effectively reduces the noise of PSA nitrogen generator exhaust, improves the silencing effect, ensures a safe working environment, and discharges exhaust gas through the exhaust pipe. It has a compact structure, occupies little space, and is easy to install.
Smart Images
Figure CN223842620U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of silencer technology, specifically to a multi-stage silencer. Background Technology
[0002] PSA nitrogen generators generate noise during operation, especially during gas compression and release, where the noise is particularly noticeable. Therefore, an external silencer is typically used in PSA nitrogen generation to reduce noise and ensure a comfortable and safe working environment. Traditional silencers come in two main forms: purely resistive silencers and orifice silencers. Purely resistive silencers have limited noise reduction capabilities, and the sound-absorbing material can dissipate over time, affecting their effectiveness. Orifice silencers, on the other hand, are prone to clogging after prolonged use, resulting in poor noise reduction. Currently available silencers specifically designed for PSA nitrogen generators are adequate for small PSA units, but their effectiveness needs improvement for larger equipment. Summary of the Invention
[0003] The purpose of this invention is to provide a multi-stage silencer that can effectively reduce the noise of PSA nitrogen generators during exhaust and venting, thereby improving the noise reduction effect.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] A multi-stage muffler is disclosed, comprising an air inlet chamber, a silencing chamber, and an air outlet chamber arranged from top to bottom. An air inlet pipe is inserted into the air inlet chamber. The silencing chamber includes an upper chamber and a lower chamber. A first muffler cylinder is housed in the upper chamber, and a first silencing chamber is located within the first muffler cylinder. A second muffler cylinder is housed in the lower chamber, and a second silencing chamber is located within the second muffler cylinder. The upper opening of the first silencing chamber communicates with the lower opening of the air inlet pipe. The first silencing chamber contains... The system comprises a first tube, the upper end of which is closed, and multiple first through holes on the side wall of the first tube. A second tube is provided in the second anechoic chamber, and the side wall of the second tube is connected to multiple rows of Helmholtz resonant cavities. The upper opening of the second tube is connected to the lower opening of the first tube. A third tube is provided in the air outlet chamber, and multiple second through holes are provided on the side wall of the third tube. The upper opening of the third tube is connected to the lower opening of the second tube. The lower end of the third tube is closed. An air outlet pipe is connected to the bottom of the air outlet chamber.
[0006] In this embodiment of the invention, the air inlet pipe, the first pipe body, the second pipe body, the third pipe body, and the air outlet pipe are coaxial.
[0007] In this embodiment of the invention, the inner diameters of the first tube, the second tube, and the third tube are equal.
[0008] In this embodiment of the present invention, the first anechoic chamber includes a first part whose inner diameter gradually increases from top to bottom and a second part whose inner diameter remains unchanged. The maximum inner diameter of the first part is equal to the inner diameter of the second part. The upper end of the first tube is provided with a flow guide cover plate, which has a tapered structure with an inner diameter gradually increasing from top to bottom. The flow guide cover plate is located in the first part.
[0009] In this embodiment of the invention, a plurality of first through holes are provided at intervals along the axial direction parallel to the first tube body and along the circumference of the first tube body.
[0010] In this embodiment of the invention, the multiple rows of Helmholtz resonant cavities are distributed circumferentially along the second tube, and each row of Helmholtz resonant cavities includes multiple Helmholtz resonant cavity units distributed in parallel along the axial direction parallel to the second tube.
[0011] In this embodiment of the invention, a plurality of second through holes are provided at intervals along the axial direction parallel to the third tube and along the circumference of the third tube.
[0012] In this embodiment of the utility model, the side wall of the third tube is provided with sound-absorbing cotton, and the lower end of the third tube is provided with a sound insulation board.
[0013] In this embodiment of the utility model, the multi-segment muffler is provided with a first partition, a second partition, and a third partition for dividing the interior of the multi-segment muffler into an air intake chamber, an upper chamber, a lower chamber, and an air outlet chamber. The middle portions of the first partition, the second partition, and the third partition are respectively provided with a mesh structure. The lower opening of the air intake pipe coincides with the area of the mesh structure on the first partition. The lower opening of the first pipe and the upper opening of the second pipe coincide with the area of the mesh structure on the second partition. The upper opening of the third pipe coincides with the area of the mesh structure on the third partition.
[0014] In this embodiment of the invention, the inner walls of the air intake chamber, the silencing chamber, and the air outlet chamber are all covered with a layer of sound-absorbing material, such as sound-absorbing cotton. Preferably, the inner walls of the first and second silencing chambers are both provided with composite wave cotton.
[0015] In this embodiment of the invention, the air inlet chamber, the silencing chamber, and the air outlet chamber are filled with sound-absorbing materials, such as sound-absorbing cotton.
[0016] In this embodiment of the invention, the air inlet pipe and the air outlet pipe are connected by flanges or flange plates.
[0017] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:
[0018] The multi-segment silencing structure provided by this utility model effectively reduces the noise of the PSA nitrogen generator during exhaust and venting, and the exhaust gas can be discharged outdoors through the flange at the outlet pipe, further ensuring the safety of the staff. Attached Figure Description
[0019] Figure 1 This is a schematic cross-sectional view of the multi-section muffler in Example 1;
[0020] Figure 2 This is a schematic cross-sectional view of the first silencing chamber in the multi-segment silencer of Example 1.
[0021] Figure 3 This is a cross-sectional view of the second silencing chamber in the multi-segment silencer of Example 1.
[0022] Figure 4 This is a schematic diagram of the structure of the first partition in the multi-segment silencer of Example 1;
[0023] Figure 5 This is a simulation diagram of gas flow in the multi-segment silencer of Example 1.
[0024] In the attached diagrams above, 11 is the intake chamber; 111 is the intake pipe; 121 is the upper chamber; 122 is the lower chamber; 13 is the exhaust chamber; 131 is the exhaust pipe; 21 is the first muffler body; 211 is the first silencer chamber; 22 is the second muffler body; 221 is the second silencer chamber; 31 is the first pipe body; 311 is the first through hole; 312 is the guide cover; 32 is the second pipe body; 321 is the Helmholtz resonant cavity; 33 is the third pipe body; 331 is the second through hole; 332 is the sound insulation board; 41 is the first partition; 42 is the second partition; 43 is the third partition; 5 is the sound-absorbing cotton; 6 is the flange; and 7 is the flange plate. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.
[0026] In the description of this utility model, it should be understood that the use of directional terms such as "upper," "lower," "inner," "outer," "axial," and "circumferential" is merely for the convenience of describing the embodiments of this utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of this utility model.
[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.
[0028] In the description of this utility model, "multiple" refers to two or more.
[0029] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.
[0030] Example 1
[0031] like Figures 1 to 4 As shown, this embodiment provides a multi-segment muffler, which has an air intake chamber 11, a silencing chamber, and an air outlet chamber 13 arranged sequentially from top to bottom. Specifically, the multi-segment muffler of this embodiment includes a cylindrical muffler housing. Inside the housing, a first partition 41, a second partition 42, and a third partition 43 are arranged sequentially from top to bottom, dividing the interior of the housing into an air intake chamber 11, an upper chamber 121 of the silencing chamber, a lower chamber 122 of the silencing chamber, and an air outlet chamber 13. The middle portions of the first partition 41, the second partition 42, and the third partition 43 are respectively provided with a mesh structure, which can connect the above-mentioned chambers. The upper chamber 121 contains a first muffler cylinder 21, which contains a first silencing chamber 211. The lower chamber 122 contains a second muffler cylinder 22, which contains a second silencing chamber 221. The upper opening of the first silencing chamber 211 is connected to the lower opening of the intake pipe 111. The first silencing chamber 211 contains a first pipe 31, the upper end of which is closed. The side wall of the first pipe 31 has multiple first through holes 311. The anechoic chamber 221 is provided with a second tube 32, the side wall of which is connected to multiple rows of Helmholtz resonant cavities 321. The upper opening of the second tube 32 is connected to the lower opening of the first tube 31. The vent chamber 13 is provided with a third tube 33, the side wall of which is provided with multiple second through holes 331. The upper opening of the third tube 33 is connected to the lower opening of the second tube 32. The lower end of the third tube 33 is closed. The bottom of the vent chamber 13 is connected to an vent pipe 131.
[0032] In this embodiment, the first anechoic chamber 211 includes a first part with an inner diameter that gradually increases from top to bottom and a second part with an inner diameter that remains constant. The maximum inner diameter of the first part is equal to the inner diameter of the second part. A flow guide cover 312 is provided at the upper end of the first tube 31. The flow guide cover 312 has a tapered structure with an inner diameter that gradually increases from top to bottom and is located in the first part. The first through holes 311 are spaced apart along the axial direction parallel to the first tube 31 and along the circumference of the first tube 31. Multiple rows of Helmholtz resonant cavities 321 are spaced apart along the circumference of the second tube. Each row of Helmholtz resonant cavities 321 includes multiple Helmholtz resonant cavity units that are distributed in parallel along the axial direction parallel to the second tube 32. The second through holes 331 are spaced apart along the axial direction parallel to the third tube 33 and along the circumference of the third tube 33.
[0033] In this embodiment, the intake pipe 111, the first pipe body 31, the second pipe body 32, the third pipe body 33, and the exhaust pipe 131 are coaxial. The inner diameters of the first pipe body 31, the second pipe body 32, and the third pipe body 33 are equal. The lower opening of the intake pipe 111 coincides with the area where the mesh structure is located on the first partition 41. The lower opening of the first pipe body 31 and the upper opening of the second pipe body 32 coincide with the area where the mesh structure is located on the second partition 42. The upper opening of the third pipe body 33 coincides with the area where the mesh structure is located on the third partition 43.
[0034] In this embodiment, the side wall of the third tube 33 is provided with sound-absorbing cotton, and the lower end of the third tube 33 is welded with a sound insulation plate 332.
[0035] In this embodiment, the inner walls of the air inlet chamber 11, the silencing chamber, and the air outlet chamber 13 are all covered with sound-absorbing cotton 5. The inner walls of the first silencing chamber 211 and the second silencing chamber 221 are both provided with composite corrugated cotton. In addition, sound-absorbing cotton is also provided on the first partition 41, the second partition 42, and the third partition 43, so as to improve the noise reduction and sound insulation effect. A flange 6 is welded at the air inlet pipe 111 to facilitate connection to the PSA nitrogen generator. A flange 7 is welded at the air outlet pipe 131 to facilitate workers to discharge gas outside the plant by connecting pipes.
[0036] like Figure 5 As shown in the diagram, the arrows represent the simulated process of gas entering through the intake pipe 111 and exiting through the exhaust pipe 131.
[0037] Gas enters the silencer through the intake pipe 111 at the connecting flange. During the process of entering, the gas is first silenced by the sound-absorbing cotton in the intake chamber 11, and then enters the first silencer chamber 211 through the small hole on the first partition 41.
[0038] After the gas enters the first silencing chamber 211, it is first diverted by the guide cover plate 312. After diversion, the gas enters the first pipe body 31 through the first through hole 311, causing the gas to collide in the pipe. During the collision process, the airflow speed gradually decreases and the noise is reduced. Then, it enters the second silencing chamber 221 through the mesh structure on the second partition plate 42.
[0039] After being silenced by diversion and counter-current, the gas enters the second tube 32, which is located in the second silencing chamber 221, through the small holes on the second partition 42. The gas is then depressurized and silenced again through the Helmholtz resonant cavity 321, and enters the third tube 33 through the mesh structure on the third partition 43.
[0040] The third tube 33 has thickened corrugated sound-absorbing cotton to silence the gas. The gas enters the exhaust chamber 13 through the mesh structure on the third tube 33. Due to the increased space, the flow rate slows down, thus performing the final silencing treatment on the gas. Finally, the gas is discharged from the exhaust pipe 131.
[0041] The multi-stage silencer in this embodiment improves noise reduction and reduces noise pollution. It not only meets the high noise reduction requirements of PSA nitrogen generators but also allows gas to be discharged outdoors via pipelines, further ensuring worker safety. The multi-stage silencer in this embodiment has a compact structure, occupies little space, and is easier to install and connect to external exhaust pipelines.
[0042] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. A multi-stage silencer, characterized in that, The multi-section muffler has an intake chamber (11), a silencer chamber, and an exhaust chamber (13) arranged from top to bottom. An intake pipe (111) is inserted into the intake chamber (11). The silencer chamber includes an upper chamber (121) located above and a lower chamber (122) located below. A first muffler cylinder (21) is located in the upper chamber (121), and a first silencer chamber (211) is located within the first muffler cylinder. A second muffler cylinder (22) is located in the lower chamber (122), and a second silencer chamber (221) is located within the second muffler cylinder. The top of the first silencer chamber (211) is connected to the intake pipe (111), and a first pipe (31) is located within the first silencer chamber (211). The upper end of the first tube (31) is closed, and the side wall of the first tube (31) is provided with a plurality of first through holes (311). The second anechoic chamber (221) is provided with a second tube (32), and the side wall of the second tube (32) is connected to a plurality of rows of Helmholtz resonant cavities (321). The upper opening of the second tube (32) is connected to the lower opening of the first tube (31). The air outlet chamber (13) is provided with a third tube (33), and the side wall of the third tube (33) is provided with a plurality of second through holes (331). The upper opening of the third tube (33) is connected to the lower opening of the second tube (32). The lower end of the third tube (33) is closed. The bottom of the air outlet chamber (13) is connected to an air outlet pipe (131).
2. The multi-segment silencer according to claim 1, characterized in that, The air intake pipe (111), the first pipe body (31), the second pipe body (32), the third pipe body (33), and the air outlet pipe (131) are coaxial; And / or, the inner diameters of the first tube (31), the second tube (32), and the third tube (33) are equal.
3. The multi-segment silencer according to claim 1, characterized in that, The first anechoic chamber (211) includes a first part whose inner diameter gradually increases from top to bottom and a second part whose inner diameter remains unchanged. The upper end of the first tube (31) is provided with a flow guide cover (312), which has a tapered structure with an inner diameter gradually increasing from top to bottom. The flow guide cover (312) is located in the first part.
4. The multi-segment silencer according to claim 1, characterized in that, Multiple first through holes (311) are provided at intervals along the axis parallel to the first tube body (31) and along the circumference of the first tube body (31).
5. The multi-segment silencer according to claim 1, characterized in that, The multiple rows of Helmholtz resonant cavities (321) are distributed circumferentially along the second tube (32), and each row of Helmholtz resonant cavities (321) includes multiple Helmholtz resonant cavity units distributed in parallel along the axis parallel to the second tube (32).
6. The multi-segment silencer according to claim 1, characterized in that, Multiple second through holes (331) are provided at intervals along the axial direction parallel to the third tube (33) and along the circumference of the third tube (33).
7. The multi-segment silencer according to claim 1, characterized in that, The side wall of the third tube is provided with sound-absorbing cotton, and the lower end of the third tube is provided with a sound insulation plate (332).
8. The multi-segment silencer according to claim 1, characterized in that, The multi-segment muffler is internally provided with a first partition (41), a second partition (42), and a third partition (43) for dividing the interior of the multi-segment muffler into the air intake chamber (11), the upper chamber (121), the lower chamber (122), and the air outlet chamber (13). The middle part of the first partition (41), the second partition (42), and the third partition (43) are respectively provided with a mesh structure. The lower end opening of the air intake pipe (111) coincides with the area of the mesh structure on the first partition (41). The lower end opening of the first pipe body (31) and the upper end opening of the second pipe body (32) coincide with the area of the mesh structure on the second partition (42). The upper end opening of the third pipe body (33) coincides with the area of the mesh structure on the third partition (43).
9. The multi-stage silencer according to claim 1, characterized in that, The inner walls of the air intake chamber (11), the silencing chamber and the air outlet chamber (13) are all covered with a layer of sound-absorbing material; and / or, the air intake chamber (11), the silencing chamber and the air outlet chamber (13) are filled with sound-absorbing material.
10. The multi-stage silencer according to claim 1, characterized in that, The air inlet pipe (111) and the air outlet pipe (131) are connected by flanges (6) or flanges (7).