CN118881847B - A composite silencer for gas pipeline - Google Patents
A composite silencer for gas pipeline Download PDFInfo
- Publication number
- CN118881847B CN118881847B CN202411388777.XA CN202411388777A CN118881847B CN 118881847 B CN118881847 B CN 118881847B CN 202411388777 A CN202411388777 A CN 202411388777A CN 118881847 B CN118881847 B CN 118881847B
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- China
- Prior art keywords
- pipe
- silencer
- shell
- fixedly connected
- fixed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000003584 silencer Effects 0.000 title claims abstract description 32
- 239000002131 composite material Substances 0.000 title claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 8
- 239000011358 absorbing material Substances 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 230000000087 stabilizing effect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000030279 gene silencing Effects 0.000 description 33
- 239000011148 porous material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000001743 silencing effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/0336—Noise absorbers by means of sound-absorbing materials
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Exhaust Silencers (AREA)
Abstract
本发明涉及消音器领域，具体为一种气体管道复合型消音器，包括进气管，所述进气管的一端贯穿并固定连接法兰一，另一端贯穿并固定连接外壳，且外壳远离进气管的一端贯穿并固定连接法兰二，外壳为钟状结构，且外壳的内壁上固定有管壁吸音网，且管壁吸音网是由多层金属编织网组成的吸音材料；外壳内设置有消音管和消音孔板，所述消音管的一端进气管相连通，且消音管的周壁上开设有多个小孔，所述消音管远离进气管的一端固定有堵盖，所述消音孔板位于外壳内侧靠近法兰二的一端处。该种气体管道复合型消音器，起到对气流的分流和稳流的作用，实现在确保管道输送流量不变的情况下，降低管道气体流动速度、吸附声音降低噪声外传，起到很好的消音效果。
The present invention relates to the field of silencers, specifically a composite silencer for gas pipelines, including an air intake pipe, one end of the air intake pipe penetrates and is fixedly connected to flange 1, the other end penetrates and is fixedly connected to a shell, and the end of the shell away from the air intake pipe penetrates and is fixedly connected to flange 2, the shell is a bell-shaped structure, and a pipe wall sound-absorbing net is fixed on the inner wall of the shell, and the pipe wall sound-absorbing net is a sound-absorbing material composed of multiple layers of metal woven nets; a silencer pipe and a silencer orifice plate are arranged in the shell, one end of the silencer pipe is connected to the air intake pipe, and a plurality of small holes are opened on the peripheral wall of the silencer pipe, a plugging cover is fixed on the end of the silencer pipe away from the air intake pipe, and the silencer orifice plate is located at one end of the inner side of the shell near flange 2. This composite silencer for gas pipelines plays the role of diverting and stabilizing the flow of airflow, and reduces the flow velocity of pipeline gas, absorbs sound and reduces noise transmission while ensuring that the pipeline delivery flow rate remains unchanged, thereby achieving a good silencer effect.
Description
Technical Field
The invention relates to the field of silencers, in particular to a composite silencer for a gas pipeline.
Background
When the gas is conveyed through the pipeline, in order to reduce the conveying cost, high-pressure conveying is adopted, the gas is conveyed to a destination and then is subjected to pressure reduction and pressure stabilization by a gas pressure reducing valve, and a stable gas source with lower pressure is obtained by using gas equipment. The gas pressure reducing valve can reduce and stabilize pressure and generate noise, so that noise pollution is generated, and the gas pressure reducing valve is unacceptable.
Disclosure of Invention
The invention aims to provide a composite silencer for a gas pipeline, which aims to solve the problems in the prior art. The invention provides a gas pipeline composite silencer which comprises a gas inlet pipe, wherein one end of the gas inlet pipe penetrates through and is fixedly connected with a first connecting flange, the other end of the gas inlet pipe penetrates through and is fixedly connected with a shell, one end of the shell, which is far away from the gas inlet pipe, penetrates through and is fixedly connected with a second connecting flange, the shell is of a bell-shaped structure, a pipe wall sound absorbing net is fixed on the inner wall of the shell, and the pipe wall sound absorbing net is made of a sound absorbing material formed by multiple layers of metal woven meshes;
Be provided with muffler pipe and amortization orifice plate in the shell, the one end intake pipe of muffler pipe is linked together, and has seted up a plurality of apertures on the perisporium of muffler pipe, the one end that the intake pipe was kept away from to the muffler pipe is fixed with the blanking cap, the amortization orifice plate is located the one end department that is close to flange two in the shell inboard.
Preferably, the one end that the blanking cover was kept away from to the amortization pipe is integrated fixed connection with the intake pipe, pass through bolt assembly fixed connection between the center of blanking cover and the center of amortization orifice plate, and the outer peripheral wall of amortization orifice plate is laminated with the inner wall of shell, the pipe wall is inhaled the sound net and is located one side of amortization orifice plate towards the amortization pipe.
Preferably, the end face of one end of the silencing pipe far away from the blanking cover is coaxially and fixedly connected with a turntable bearing, an impeller is fixed on the inner wall of the end, the central position of one side of the blanking cover far away from the silencing pipe is vertical and fixedly connected with a reciprocating screw rod, and the other end of the reciprocating screw rod is fixedly connected to a silencing pore plate in a rotating mode.
Preferably, the inner wall of the shell is fixed with a ring boss, the silencing orifice plate is fixed on the ring boss through a plurality of screws, and the silencing orifice plate and the pipe wall sound absorbing net are positioned on two sides of the ring boss.
Preferably, the silencing orifice plate is vertical to one side of the reciprocating screw rod and fixedly connected with a plurality of sliding rods, and the sliding rods are arranged at equal intervals along the circumferential direction.
Preferably, the included angle between the jet direction of the small hole and the central axis of the silencing pipe is 45-135 degrees.
Preferably, the air inlet pipe is arranged on the outer peripheral wall of one end of the inner part of the shell in a sleeved mode and fixedly connected with a ring plate, a plurality of grooves are formed in one side, facing the silencing orifice plate, of the ring plate, the grooves are in one-to-one correspondence with the sliding rods, the opening structure of each groove is in an outward-expanding conical mode, and one end, far away from the silencing orifice plate, of each sliding rod is inserted into the corresponding groove.
Preferably, the reciprocating screw rod is sleeved with a sliding sleeve in a matched sliding connection manner, a plurality of supporting rods are fixed on the peripheral wall of the sliding sleeve, and the supporting rods and the sliding rods are arranged in one-to-one correspondence.
Preferably, a push-pull rod is fixed at one end of the support rod far away from the sliding sleeve, the push-pull rod and the sliding rod are arranged in parallel, a sliding block is fixed at one end of the push-pull rod far away from the support rod, and the sliding block is connected to the corresponding sliding rod in a sliding manner.
Preferably, the fixed shaft on the push-pull rod is rotationally connected with a plurality of shaft rods, the shaft rods are perpendicular to the central axis of the silencing pipe, one ends of the shaft rods, which are directed to the silencing pipe, are coaxially and fixedly connected with the fan wheel, the other ends of the silencing pipe are coaxially and fixedly connected with the gear, the side wall of the slide rod is provided with a tooth structure along the length direction, and the gear is meshed and connected with the corresponding tooth structure.
Compared with the prior art, the invention has the beneficial effects that:
According to the invention, the silencing pipe, the pipe wall sound absorbing net and the silencing pore plate are arranged in the shell, so that the pipe diameter is enlarged after the air flow is discharged into the shell through each small hole on the peripheral wall of the silencing pipe, the air flow speed is slowed down, the small holes play a role in splitting and stabilizing the air flow, and therefore vibration and noise of the air flow are greatly reduced, the noise is absorbed through the sound absorbing material pipe wall sound absorbing net formed by the multi-layer metal woven net, the silencing effect is improved, the air flow in the shell is subjected to silencing and noise reduction again through the holes on the silencing pore plate, and the effects of reducing the air flow speed of the pipeline and absorbing the sound to reduce the noise from being transmitted outwards are achieved under the condition that the pipeline conveying flow is unchanged.
Drawings
FIG. 1 is a schematic diagram of the sectional structure of the assembly of the present invention;
FIG. 2 is a schematic diagram of a cross-sectional structure of a final assembly of the present invention;
FIG. 3 is an enlarged schematic view of the structure of FIG. 1 at A;
fig. 4 is a schematic structural view of a sound-deadening orifice plate according to the present invention.
In the figure, 1, a flange I; 2, an air inlet pipe, 3, a shell, 4, a second flange, 5, a sound absorption pipe, 6, a pipe wall sound absorption net, 7, a blocking cover, 8, a sound absorption pore plate, 9, a bolt component, 10, a small hole, 11, a ring boss, 12, a screw, 13, a reciprocating screw rod, 14, a sliding sleeve, 15, a supporting rod, 16, a sliding rod, 17, an impeller, 18, a turntable bearing, 19, a sliding rod, 20, a ring plate, 21, a groove, 22, a tooth structure, 23, a shaft lever, 24, a gear, 25, a fan wheel, 26 and a sliding block.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are obtained by a worker of ordinary skill in the art without creative efforts, are within the protection scope of the present invention based on the embodiments of the present invention.
Example 1
Referring to fig. 1 and 4, the present invention provides a technical solution, including an air inlet pipe 2, wherein one end of the air inlet pipe 2 penetrates through and is fixedly connected with a first flange 1, the other end penetrates through and is fixedly connected with a housing 3, one end of the housing 3 far away from the air inlet pipe 2 penetrates through and is fixedly connected with a second flange 4, the housing 3 has a bell-shaped structure, a pipe wall sound absorbing net 6 is fixed on the inner wall of the housing 3, and the pipe wall sound absorbing net 6 is made of a sound absorbing material composed of a plurality of layers of metal woven meshes;
Be provided with muffler 5 and amortization orifice plate 8 in the shell 3, the one end intake pipe 2 of muffler 5 is linked together, and has seted up a plurality of apertures 10 on the perisporium of muffler 5, the one end that intake pipe 2 was kept away from to muffler 5 is fixed with blanking cover 7, amortization orifice plate 8 is located the inboard one end department that is close to flange two 4 of shell 3.
In this embodiment, the one end that blanking pipe 5 kept away from blanking cover 7 and intake pipe 2 integration fixed connection, pass through bolt assembly 9 fixed connection between the center of blanking cover 7 and the center of amortization orifice plate 8, and the outer peripheral wall of amortization orifice plate 8 is laminated with the inner wall of shell 3, pipe wall sound absorbing net 6 is located one side of amortization orifice plate 8 towards blanking pipe 5.
The working principle and the advantages of the invention are that when the gas pipeline composite silencer is used, the working process is as follows:
As shown in fig. 1 and 4, the silencing orifice plate 8 is fixed on the blocking cover 7 of the silencing pipe 5 through the bolt assembly 9, the flange 1 is connected and fixed on the air outlet port of the pressure reducing valve, the flange 4 is connected with the air outlet pipe, the air which is depressurized and stabilized by the pressure reducing valve enters the air inlet pipe 2 and is conveyed into the silencing pipe 5, and then is discharged into the shell 3 through each small hole 10 on the peripheral wall of the silencing pipe 5, at the moment, the pipe diameter is enlarged, the air flow speed is slowed down, and each small hole 10 on the peripheral wall of the silencing pipe 5 plays a role in shunting and stabilizing the air flow, so that the vibration and the noise of the air flow are greatly reduced, the noise is absorbed through the sound absorbing material pipe wall sound absorbing net 6 consisting of the multi-layer metal woven mesh, the silencing effect is improved, and the air flow in the shell 3 is silenced again through the holes on the silencing orifice plate 8, so that the air flow speed of the pipeline is reduced (the noise is reduced or the air flow resistance is reduced to the minimum) is ensured, and the noise is reduced.
Example 2
Referring to fig. 2 to 4, the present invention provides a technical solution, including an air inlet pipe 2, wherein one end of the air inlet pipe 2 penetrates through and is fixedly connected with a first flange 1, the other end penetrates through and is fixedly connected with a housing 3, one end of the housing 3 far away from the air inlet pipe 2 penetrates through and is fixedly connected with a second flange 4, the housing 3 has a bell-shaped structure, a pipe wall sound absorbing net 6 is fixed on the inner wall of the housing 3, and the pipe wall sound absorbing net 6 is made of a sound absorbing material composed of a plurality of layers of metal woven meshes;
Be provided with muffler 5 and amortization orifice plate 8 in the shell 3, the one end intake pipe 2 of muffler 5 is linked together, and has seted up a plurality of apertures 10 on the perisporium of muffler 5, the one end that intake pipe 2 was kept away from to muffler 5 is fixed with blanking cover 7, amortization orifice plate 8 is located the inboard one end department that is close to flange two 4 of shell 3.
In this embodiment, coaxial fixed connection turntable bearing 18 on the end face of the one end that the blanking tube 5 kept away from blanking cover 7, and be fixed with impeller 17 on this end inner wall, blanking cover 7 deviates from the one side central point that the blanking tube 5 put perpendicular and fixed connection reciprocating screw rod 13, and reciprocating screw rod 13's the other end dead axle rotation is connected on the amortization orifice plate 8, the direction of spraying of aperture 10 is 45 ~135 with the central axis contained angle of blanking tube 5, is fixed with the protruding 11 of ring on the inner wall of shell 3, and amortization orifice plate 8 passes through a plurality of screws 12 to be fixed on protruding 11 of ring, and amortization orifice plate 8 and pipe wall sound absorbing net 6 are located the both sides of protruding 11 of ring.
In this embodiment, the amortization orifice plate 8 is perpendicular and many slide bars 16 of fixed connection towards one side of reciprocating screw 13, and many slide bars 16 along circumference trend equidistant setting, cover establishes and fixedly connected with annular plate 20 on the inside one end peripheral wall of intake pipe 2 is located shell 3, a plurality of recesses 21 have been seted up towards one side of amortization orifice plate 8 to annular plate 20, and a plurality of recess 21 and a plurality of slide bars 16 one-to-one set up, the opening structure of recess 21 is the toper that expands outward, and the opening structure of recess 21 helps guiding the tip of slide bar 16, reduces the installation degree of difficulty, and the one end that slide bar 16 kept away from amortization orifice plate 8 is pegged graft in the recess 21 that corresponds.
In this embodiment, the sliding sleeve 14 is sleeved and adapted on the reciprocating screw rod 13, a plurality of struts 15 are fixed on the peripheral wall of the sliding sleeve 14, a plurality of struts 15 are arranged in one-to-one correspondence with a plurality of sliding rods 16, a push-pull rod 19 is fixed at one end of the struts 15 far away from the sliding sleeve 14, the push-pull rod 19 and the sliding rods 16 are arranged in parallel, a sliding block 26 is fixed at one end of the push-pull rod 19 far away from the struts 15, the sliding block 26 is slidingly connected on the corresponding sliding rods 16, a plurality of shafts 23 are fixedly connected on the push-pull rod 19 in a rotating manner, the shafts 23 are perpendicular to the central axis of the silencing tube 5, one end of the shaft 23 pointing to the silencing tube 5 is coaxially and fixedly connected with a sector 25, the other end of the silencing tube 5 is coaxially and fixedly connected with a gear 24, a tooth structure 22 is arranged on the side wall of the sliding rod 16 along the length direction, and the gear 24 is in meshed connection with the corresponding tooth structure 22.
The working principle and the advantages of the invention are that when the gas pipeline composite silencer is used, the working process is as follows:
As shown in fig. 2 to 4, the silencing orifice plate 8 is fixed on the annular protrusion 11 through the screw 12, the turntable bearing 18 is buckled on the end face of the air inlet pipe 2, one end of the sliding rod 16 away from the silencing orifice plate 8 is spliced in the corresponding groove 21 and then is connected and fixed on the air outlet port of the pressure reducing valve through the flange one 1, the flange two 4 is connected with the air outlet pipe, the air which is depressurized and stabilized by the pressure reducing valve enters the air inlet pipe 2 and is conveyed into the silencing pipe 5, then is discharged into the shell 3 through each small hole 10 on the peripheral wall of the silencing pipe 5, at the moment, the pipe diameter is enlarged, the air flow speed is slowed down, the spraying angles of the small holes 10 enable the directions of the air flow after entering the shell 3 to be different, and the impeller 17 is pushed in the process of the air flow entering the silencing pipe 5, so that the air flow drives the silencing pipe 5 to rotate, namely, the air is discharged by the small holes 10 and simultaneously rotated, the effect of diversion and steady flow of air flow is greatly improved, the vibration and noise of air flow are greatly reduced, the noise is absorbed through the sound absorbing net 6 formed by the multi-layer metal woven net, the silencing effect is improved, the reciprocating screw rod 13 is driven to synchronously rotate through the blanking cover 7 while the silencing pipe 5 rotates, the sliding sleeve 14 drives the corresponding push-pull rod 19 to reciprocate through the supporting rod 15, the push-pull rod 19 drives the shaft rod 23 and the fan wheel 25 thereon to synchronously reciprocate, the air sprayed out from the small holes 10 is stirred, the shaft rod 23 moves and drives the gear 24 to rotate on the tooth structure 22 on the corresponding sliding rod 16, the shaft rod 23 drives the fan wheel 25 to rotate, the steady flow effect on air flow is improved, the working process uses the air flow kinetic energy to do work, and the air flow speed is further reduced, then, the air flow in the shell 3 is subjected to noise reduction through the holes on the noise reduction pore plate 8, so that the effect of reducing the flow speed of the pipeline air (reducing noise) and the noise transmission by absorbing the sound is achieved under the condition that the pipeline conveying flow is ensured to be unchanged (no air flow resistance or the air flow resistance is reduced to be very small), and a good noise reduction effect is achieved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
In the description of the present invention, unless otherwise indicated, the meaning of "plurality" is two or more, and the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected" and "connected" are to be construed broadly, and for example, they may be fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411388777.XA CN118881847B (en) | 2024-10-08 | 2024-10-08 | A composite silencer for gas pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411388777.XA CN118881847B (en) | 2024-10-08 | 2024-10-08 | A composite silencer for gas pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118881847A CN118881847A (en) | 2024-11-01 |
| CN118881847B true CN118881847B (en) | 2025-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411388777.XA Active CN118881847B (en) | 2024-10-08 | 2024-10-08 | A composite silencer for gas pipeline |
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| Country | Link |
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| CN (1) | CN118881847B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202284702U (en) * | 2012-03-08 | 2012-06-27 | 吕瀛 | Fuel gas pipeline silencer |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101753537B1 (en) * | 2016-11-15 | 2017-07-05 | 김창주 | Apparatus for gas flow checking of gas pipe |
| CN210890577U (en) * | 2019-11-14 | 2020-06-30 | 故城山水水泥有限公司 | Silencing pipeline |
| CN216555938U (en) * | 2021-09-29 | 2022-05-17 | 启东市海信机械有限公司 | Pipe silencer |
| CN216952206U (en) * | 2021-12-28 | 2022-07-12 | 河南庆安化工高科技股份有限公司 | Positive pressure silencing device |
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2024
- 2024-10-08 CN CN202411388777.XA patent/CN118881847B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202284702U (en) * | 2012-03-08 | 2012-06-27 | 吕瀛 | Fuel gas pipeline silencer |
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| CN118881847A (en) | 2024-11-01 |
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