Multi-channel reducing silencer

Abstract

The utility model discloses a multi-channel reducing silencer which comprises a reducing pipe, an air inlet and an air outlet are formed in the two ends of the reducing pipe respectively, an inlet flange is arranged at the position of the air inlet, an outlet flange is arranged at the position of the air outlet, and an air inlet and an air outlet are formed in the reducing pipe. The inner diameter of the end, close to the air inlet, of the reducer pipe is smaller than the inner diameter of the end, close to the air outlet, of the reducer pipe. The first filtering assembly is arranged in the inlet flange; the second filtering assembly is arranged in the reducer pipe; the rectifying plate assembly is arranged on the side, close to the outlet flange, of the second filtering assembly; the fixing rod assembly is arranged in the reducer pipe, and the first filtering assembly, the second filtering assembly, the rectifying plate assembly and the reducer pipe are detachably connected through the fixing rod assembly. The multi-stage silencer has a multi-stage silencing function, is compact in overall structure, small in size and capable of being installed in the variable-diameter pipe behind the valve, the valve does not need to be disassembled when the silencer is replaced, and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas transmission and distribution equipment, and further relates to a multi-channel variable-diameter silencer. Background Art

[0002] In the natural gas transmission and distribution system, a pressure regulating valve is needed to reduce the pressure of natural gas. During the process of reducing the natural gas pressure, the original potential energy of the fluid at the throttling point is converted, the gas flow rate is accelerated and accompanied by a certain temperature drop, thereby reducing the gas pressure. The increase in gas flow rate and the change in flow state at the throttling point cause vibration, which generates a higher frequency and sound power of sound waves, resulting in increased noise. The noise pollution caused by the pressure regulating system inevitably causes trouble to the lives of users, so the pressure regulating system needs to be noise-reduced.

[0003] The existing means of noise reduction in the pressure regulating system are usually to set up silencers inside and cover the outer surface of the pipe with sound insulation materials, etc. These treatment methods all have shortcomings: for example, if there is a built-in silencer, first of all, it is necessary to ensure that the valve of the pressure regulator or the regulating valve has a noise reduction structure design. Even if there is a noise reduction design, it is difficult to achieve a good noise reduction effect due to the limited internal space; another example is to cover the surface of the pipe with sound insulation materials, which are usually sound-absorbing cotton. Since the coating thickness cannot be infinitely controlled, the thin sound-absorbing cotton coating layer can only have a limited noise reduction effect. In addition, gas facilities belong to explosion zone I, and sound-absorbing cotton usually does not meet the requirements of Class A fire protection standards, which is prone to fire hazards. In terms of maintenance, the replacement of the internal silencer of the pressure regulator is also relatively troublesome. The pressure regulator needs to be disassembled and the silencer replaced, which has high on-site replacement and maintenance costs. The disassembly and assembly of the pressure regulator needs to be carried out by more professional assemblers, which increases the manufacturing cost and lacks versatility.

[0004] Therefore, it is necessary to design a multi-channel variable diameter silencer to solve the above problems. Summary of the invention

[0005] In response to the above technical problems, the purpose of the utility model is to provide a multi-channel variable diameter silencer, which has a multi-stage silencer function, a compact overall structure, a small size, and can be installed in a variable diameter pipe behind a valve. The silencer can be replaced without disassembling the valve, thereby reducing maintenance costs.

[0006] In order to achieve the above object, the utility model provides a multi-channel variable diameter silencer, comprising:

[0007] A reducer, wherein an air inlet and an air outlet are respectively arranged at both ends of the reducer, an inlet flange is arranged at the air inlet, an outlet flange is arranged at the air outlet, and the inner diameter of the reducer near the air inlet is smaller than the inner diameter of the reducer near the air outlet;

[0008] A first filter assembly is disposed in the inlet flange, and the first filter assembly is used to divide and disrupt the airflow;

[0009] A second filter assembly is disposed in the reducer, and the second filter assembly is used to divide the disrupted airflow into a plurality of small airflows;

[0010] A rectifier plate assembly, arranged on a side of the second filter assembly close to the outlet flange;

[0011] A fixing rod assembly is disposed in the reducer, and the fixing rod assembly detachably connects the first filter assembly, the second filter assembly, the rectifier plate assembly and the reducer.

[0012] In some embodiments, the first filtering component includes:

[0013] A first filter plate is disposed in the inlet flange, and the first filter plate is located on a side of the inlet flange close to the air inlet;

[0014] A second filter plate is disposed in the inlet flange and spaced apart from the first filter plate, the second filter plate being located on a side of the inlet flange away from the air inlet;

[0015] An elastic filler is arranged in the inlet flange, and the elastic filler is located between the first filter plate and the second filter plate.

[0016] In some embodiments, the first filtering component further includes:

[0017] A connecting plate, arranged around the elastic filler, and used to connect the first filter plate, the second filter plate, and the elastic filler into one;

[0018] One end of the connecting plate is fixedly connected to the first filter plate, and the other end of the connecting plate is detachably connected to the second filter plate;

[0019] Or, one end of the connecting plate is detachably connected to the first filter plate, and the other end of the connecting plate is fixedly connected to the second filter plate;

[0020] Alternatively, one end of the connecting plate is detachably connected to the first filter plate, and the other end of the connecting plate is detachably connected to the second filter plate.

[0021] In some embodiments, the first filter plate is provided with a plurality of first strip-shaped holes arranged in parallel and at intervals;

[0022] The second filter plate is provided with a plurality of second strip holes which are arranged in parallel and spaced apart from each other, and the second strip holes are arranged in parallel with the first strip holes.

[0023] In some embodiments, the second filtering component includes:

[0024] A cylindrical body, wherein a plurality of first filtering holes and a plurality of second filtering holes are arranged on the cylindrical body, and the plurality of first filtering holes and the plurality of second filtering holes are staggered and interconnected;

[0025] A plurality of the first filtering holes are arranged at intervals along the length direction of the cylindrical body and penetrate through both ends of the cylindrical body;

[0026] A plurality of the second filtering holes are arranged at intervals along the circumferential direction of the cylindrical body and penetrate through both sides of the cylindrical body.

[0027] In some embodiments, the second filtering component further comprises:

[0028] An annular boss is disposed at the end of the cylindrical body, and the outer diameter of the annular boss is greater than the outer diameter of the cylindrical body;

[0029] A first limiting boss is provided at one end of the reducer near the air inlet, and the size of the first limiting boss is larger than the inner diameter of the end of the reducer near the air inlet, so that when the annular boss abuts against the first limiting boss, the first limiting boss can limit the movement of the second filter assembly towards the direction close to the outlet flange.

[0030] In some embodiments, the rectifying plate assembly comprises:

[0031] A first rectifying plate, arranged in the outlet flange, wherein a plurality of first through holes evenly spaced are arranged on the first rectifying plate, and the first through holes are arranged along the flow direction of the airflow;

[0032] A second limiting boss is provided in the outlet flange, and the size of the second limiting boss is larger than the inner diameter of the cavity on the side close to the inlet flange, so that when the first rectifying plate abuts against the second limiting boss, the second limiting boss can limit the movement of the first rectifying plate towards the direction close to the inlet flange.

[0033] In some embodiments, the rectifier plate assembly further comprises:

[0034] A second rectifying plate is arranged in the reducer, and a plurality of second through holes are arranged at even intervals on the second rectifying plate, and the second through holes are arranged along the flow direction of the airflow;

[0035] A third limiting boss is arranged in the reducer, and the size of the third limiting boss is larger than the inner diameter of the cavity on the side close to the inlet flange, so that when the second rectifying plate abuts against the third limiting boss, the third limiting boss can limit the movement of the second rectifying plate towards the direction close to the inlet flange.

[0036] In some embodiments, the fixed rod assembly includes:

[0037] A fixed screw rod, the fixed screw rod sequentially passes through the first filter assembly, the second filter assembly, and the rectifier plate assembly;

[0038] A first fixing nut, threadedly connected to the fixing screw, wherein the first fixing nut is located at a side of the first filter component away from the second filter component;

[0039] A second fixing nut, threadedly connected to the fixing screw, wherein the second fixing nut is located on a side of the first filter component close to the second filter component;

[0040] An adjusting sleeve, which is sleeved on the fixed screw rod, and the adjusting sleeve is located between the second filter assembly and the rectifier plate assembly;

[0041] A third fixing nut is threadedly connected to the fixing screw, and the third fixing nut is located on a side of the rectifier plate assembly away from the second filter assembly.

[0042] In some embodiments, the rectifier plate assembly includes a first rectifier plate and a second rectifier plate arranged at intervals, and the second rectifier plate is located between the second filter assembly and the first rectifier plate;

[0043] The adjusting sleeve comprises a first adjusting sleeve and a second adjusting sleeve, wherein the first adjusting sleeve and the second adjusting sleeve are both sleeved on the fixed screw rod;

[0044] The first adjustment sleeve is located between the first rectifying plate and the second rectifying plate, and two ends of the first adjustment sleeve are respectively abutted against the first rectifying plate and the second rectifying plate;

[0045] The second adjustment sleeve is located between the second rectifier plate and the second filter assembly, and two ends of the second adjustment sleeve are respectively abutted against the second rectifier plate and the second filter assembly.

[0046] Compared with the prior art, the multi-channel variable diameter silencer provided by the utility model has the following beneficial effects:

[0047] In the utility model, the multi-stage silencer assembly is installed in the reducer behind the valve. While having the multi-stage silencer function, the overall structure is compact, the size is small, the space occupied is extremely small, and it is easy to install and maintain. There is no requirement for the valve structure, the versatility is stronger, and the silencer does not need to be disassembled to replace the valve, thereby reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.

[0049] Figure 1 It is a structural schematic diagram of a multi-channel variable-diameter silencer according to a preferred embodiment of the utility model;

[0050] Figure 2 It is a structural schematic diagram of the first filter component of the preferred embodiment of the utility model;

[0051] Figure 3 It is a structural schematic diagram of the first filter component of the preferred embodiment of the utility model from another perspective.

[0052] Description of Figure Numbers:

[0053] Reducer 1, air inlet 11, air outlet 12, inlet flange 13, outlet flange 14, lifting eye screw 15, first filter assembly 2, first filter plate 21, first strip hole 211, second filter plate 22, elastic filler 23, connecting plate 24, second filter assembly 3, cylindrical body 31, annular boss 32, rectifier plate assembly 4, first rectifier plate 41, second rectifier plate 42, fixing rod assembly 5, fixing screw 51, first fixing nut 52, second fixing nut 53, third fixing nut 54, first adjusting sleeve 55, second adjusting sleeve 56. DETAILED DESCRIPTION

[0054] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0055] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0056] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0057] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0058] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0059] In one embodiment, the reference specification Figure 1 The utility model provides a multi-channel variable-diameter silencer, comprising: a variable-diameter pipe 1, a first filter assembly 2, a second filter assembly 3, a rectifier plate assembly 4 and a fixing rod assembly 5. The two ends of the variable-diameter pipe 1 are respectively provided with an air inlet 11 and an air outlet 12. An inlet flange 13 is provided at the air inlet 11, and screw holes and eye screws 15 can be provided on the inlet flange 13 for easy installation. An outlet flange 14 is provided at the air outlet 12, and screw holes and eye screws 15 can also be provided on the inlet flange 13 for easy installation. The inner diameter of the end of the variable-diameter pipe 1 close to the air inlet 11 is smaller than the inner diameter of the end of the variable-diameter pipe 1 close to the air outlet 12. The first filter assembly 2 is arranged in the inlet flange 13, and the first filter assembly 2 is used to divide and disrupt the airflow. The second filter assembly 3 is arranged in the variable-diameter pipe 1, and the second filter assembly 3 is used to divide the disrupted airflow into multiple small airflows. The rectifier plate assembly 4 is arranged on one side of the second filter assembly 3 close to the outlet flange 14; the fixing rod assembly 5 is arranged in the reducer 1, and the fixing rod assembly 5 detachably connects the first filter assembly 2, the second filter assembly 3, the rectifier plate assembly 4 and the reducer 1.

[0060] In this embodiment, the multi-stage silencer assembly is installed in the reducer behind the valve. While having the multi-stage silencer function, the overall structure is compact, the size is small, and the space occupied is extremely small. It is easy to install and maintain, has no requirements for the valve structure, is more versatile, and the silencer does not need to be disassembled to reduce maintenance costs.

[0061] In one embodiment, the reference specification Figures 1 to 3The first filter assembly 2 includes: a first filter plate 21, a second filter plate 22 and an elastic filler 23. The first filter plate 21 is arranged in the inlet flange 13, and the first filter plate 21 is located on the side of the inlet flange 13 close to the air inlet 11; the second filter plate 22 is arranged in the inlet flange 13 and is spaced apart from the first filter plate 21, and the second filter plate 22 is located on the side of the inlet flange 13 away from the air inlet 11; the elastic filler 23 is arranged in the inlet flange 13, and the elastic filler 23 is located between the first filter plate 21 and the second filter plate 22.

[0062] When passing through the first filter plate 21, the airflow is divided into multiple small airflows by the first filter plate 21. After the multiple small airflows enter the space of the elastic filler 23, they are further divided and disrupted by the elastic filler 23, so that the multiple airflows collide with each other and consume the potential energy of the fluid; at the same time, the elastic filler 23 itself also increases the friction force to further consume the potential energy of the fluid, and finally flows out through the second filter plate 22. This structure can reduce the noise of the airflow and minimize the restriction effect of the gas pipeline silencer on the airflow.

[0063] Specifically, the first filter plate 21 is provided with a plurality of first strip holes 211 arranged in parallel and spaced apart; the second filter plate 22 is provided with a plurality of second strip holes arranged in parallel and spaced apart, and the second strip holes are arranged in parallel with the first strip holes. The elastic filler 23 can be set as a light spring, and its spiral structure forms a curved gas channel. The plurality of light springs change the flow direction of the gas entering the gas pipeline silencer in multiple directions, while allowing the gas to flow through, which can reduce the noise of the airflow and minimize the restrictive effect of the gas pipeline silencer on the airflow. Of course, the elastic filler 23 can also be set as other common silencing materials in the field, such as glass fiber wool, foamed silicone board, polyurethane foam plastic, industrial rubber and plastic board, etc.

[0064] Furthermore, the first filter assembly 2 also includes: a connecting plate 24, which is arranged around the elastic filler 23, and the connecting plate 24 is used to connect the first filter plate 21, the second filter plate 22, and the elastic filler 23 as a whole, so that the use and installation of the first filter assembly 2 are more convenient. The connection relationship between the three is in the following form: one end of the connecting plate 24 is fixedly connected to the first filter plate 21, and the other end of the connecting plate 24 is detachably connected to the second filter plate 22; or, one end of the connecting plate 24 is detachably connected to the first filter plate 21, and the other end of the connecting plate 24 is fixedly connected to the second filter plate 22; or, one end of the connecting plate 24 is detachably connected to the first filter plate 21, and the other end of the connecting plate 24 is detachably connected to the second filter plate 22. Of course, the first filter plate 21, the second filter plate 22, and the elastic filler 23 can also be set as a split structure, which is respectively installed inside the inlet flange 13.

[0065] It should be pointed out that the specific structure of the first filter component 2 is described in accordance with the drawings in the specification. In actual use, other noise reduction devices may also be used as long as they can achieve the above functions. This is only for better illustrating the present invention and should not constitute a limitation to the present invention.

[0066] In one embodiment, the reference specification Figure 1 The second filtering component 3 includes: a cylindrical body 31, on which a plurality of first filtering holes and a plurality of second filtering holes are arranged, and the plurality of first filtering holes and the plurality of second filtering holes are staggered and interconnected; the plurality of first filtering holes are arranged at intervals along the length direction of the cylindrical body 31 and pass through both ends of the cylindrical body 31; the plurality of second filtering holes are arranged at intervals along the circumferential direction of the cylindrical body 31 and pass through both sides of the cylindrical body 31.

[0067] Furthermore, the second filter component 3 also includes: an annular boss 32, which is arranged at the end of the cylindrical body 31, and the outer diameter of the annular boss 32 is larger than the outer diameter of the cylindrical body 31; a first limiting boss is arranged at the end of the reducer 1 close to the air inlet 11, and the size of the first limiting boss is larger than the inner diameter of the end of the reducer 1 close to the air inlet 11, so that when the annular boss 32 abuts against the first limiting boss, the first limiting boss can limit the movement of the second filter component 3 towards the direction close to the outlet flange.

[0068] In this embodiment, the airflow flowing out through the second filter plate 22 and entering the second filter component 3 is divided into multiple small airflows by using the multi-channel small holes on the second filter component 3. As the gas flows through the small aperture, the frequency of the noise will increase, and the frequency of the noise is in the range insensitive to the human ear; in conjunction with the first filter component 2, multiple filtering is achieved, so that the vibration frequency of the noise sound wave obtains multiple wave frequency migrations, effectively reducing the sound waves that can be received by the human ear, thereby achieving noise reduction.

[0069] It should be pointed out that the specific structure of the second filter component 3 is described in accordance with the drawings in the specification. In actual use, other noise reduction devices can also be used as long as they can achieve the above functions. This is only for better explanation of the present invention and should not constitute a limitation to the present invention.

[0070] In one embodiment, the reference specification Figure 1The rectifying plate assembly 4 includes: a first rectifying plate 41, which is arranged in the outlet flange 14, and is provided with a plurality of first through holes evenly spaced, and the first through holes are arranged along the flow direction of the airflow. A second limiting boss is arranged in the outlet flange 14, and the size of the second limiting boss is larger than the inner diameter of the cavity on the side close to the inlet flange 14, so that when the first rectifying plate 41 abuts against the second limiting boss, the second limiting boss can limit the movement of the first rectifying plate 41 in the direction close to the inlet flange.

[0071] Furthermore, the rectifying plate assembly 4 further includes: a second rectifying plate 42, the second rectifying plate 42 is arranged in the reducer 1, and a plurality of second through holes evenly spaced are arranged on the second rectifying plate 42, and the second through holes are arranged along the flow direction of the airflow. A third limiting boss is arranged in the reducer 1, and the size of the third limiting boss is larger than the inner diameter of the cavity on the side close to the inlet flange 13, so that when the second rectifying plate 42 abuts against the third limiting boss, the third limiting boss can limit the movement of the second rectifying plate 42 in the direction close to the inlet flange.

[0072] In this embodiment, a double-layer rectifier plate structure is designed after the first filter component 2 and the second filter component 3, and the inner diameters of the two rectifier plates are successively enlarged, so that the sound waves diffuse in the enlarged diameter space. The sound intensity and sound pressure are further consumed during the diffusion process, thereby reducing the sound power and producing a noise reduction effect; high-frequency noise is more easily absorbed by the pipeline and valve body and is not easy to penetrate the pipe wall. At the same time, the two-stage rectification design gradually unifies the airflow direction to the horizontal direction, so that the airflow after noise reduction is stable, which is conducive to gas transportation.

[0073] In one embodiment, the reference specification Figure 1 , Figure 2 The fixed rod assembly 5 includes: a fixed screw 51, a first fixed nut 52, a second fixed nut 53, a third fixed nut 54 and an adjustment sleeve. The fixed screw 51 passes through the first filter assembly 2, the second filter assembly 3, and the rectifier plate assembly 4 in sequence. The first fixed nut 52 is threadedly connected to the fixed screw 51, and the first fixed nut 52 is located on the side of the first filter assembly 2 away from the second filter assembly 3. The second fixed nut 53 is threadedly connected to the fixed screw 51, and the second fixed nut 53 is located on the side of the first filter assembly 2 close to the second filter assembly 3. The adjustment sleeve is sleeved on the fixed screw 51, and the adjustment sleeve is located between the second filter assembly 3 and the rectifier plate assembly 4. The third fixed nut 54 is threadedly connected to the fixed screw 51, and the third fixed nut 54 is located on the side of the rectifier plate assembly 4 away from the second filter assembly 3.

[0074] Further, the rectifier plate assembly 4 includes a first rectifier plate 41 and a second rectifier plate 42 arranged at intervals, and the second rectifier plate 42 is located between the second filter assembly 3 and the first rectifier plate 41. The adjustment sleeve includes a first adjustment sleeve 55 and a second adjustment sleeve 56, and the first adjustment sleeve 55 and the second adjustment sleeve 56 are both sleeved on the fixed screw rod 51; the first adjustment sleeve 55 is located between the first rectifier plate 41 and the second rectifier plate 42, and the two ends of the first adjustment sleeve 55 are respectively abutted on the first rectifier plate 41 and the second rectifier plate 42; between the second rectifier plate 42 and the second filter assembly 3, and the two ends of the second adjustment sleeve 56 are respectively abutted on the second rectifier plate 42 and the second filter assembly 3.

[0075] When assembling the multi-channel variable-diameter silencer, first, one end of the fixed screw rod 51 is passed through the second filter plate 22, the elastic filler 23, and the first filter plate 21 in sequence, and then threadedly connected with the first fixing nut 52, and the other end is threadedly connected with the second fixing nut 53. The two nuts clamp and fix the second filter plate 22, the elastic filler 23, and the first filter plate 21, so as to achieve the fixed connection between the first filter component 2 and the fixed screw rod 51; after the other end of the fixed screw rod 51 is passed through the second filter component 3, the fixed screw rod 51, the first filter component 2, and the second filter component 3 are inserted into the reducer 1 from the air inlet 12 as a whole until the annular boss 32 abuts against the first limit boss; finally, the second adjustment sleeve 56, the second rectifier plate 42, the first adjustment sleeve 55, and the first rectifier plate 41 are sequentially sleeved on the fixed screw rod 51 from the air outlet 12, and then tightened and fixed with the third fixing nut 54, so as to achieve the overall assembly of the multi-channel variable-diameter silencer. During installation, the inlet flange 13 is connected to the front connecting flange of the gas pipeline, and the outlet flange 14 is connected to the rear connecting flange of the gas pipeline.

[0076] When in use, the high-pressure gas enters the reducer 1 from the air inlet 11, enters the space of the elastic filler 23 through the first filter plate 21, flows out from the second filter plate 22, enters the reducer 1 through the second filter assembly 3, and flows out from the air outlet 12 after being rectified by the second rectifier plate 42 and the first rectifier plate 41. When passing through the first filter plate 21, the airflow is divided into multiple small airflows by the first filter plate 21. After entering the space of the elastic filler 23, the airflow is further divided and disrupted by the elastic filler 23, so that the multiple airflows collide with each other and consume the potential energy of the fluid; at the same time, the elastic filler 23 itself also increases the friction force to further consume the potential energy of the fluid, flows out through the second filter plate 22 and enters the second filter assembly 3, and the multi-channel small holes on the second filter assembly 3 are used to divide the gas into multiple small airflows. As the gas flows through the small aperture, the frequency of the noise will increase. The frequency of the noise is in the insensitive range of the human ear. After three filtering, the vibration frequency of the noise sound wave obtains a three-way wave frequency migration, which effectively reduces the sound wave that can be received by the human ear and realizes noise reduction.

[0077] In addition, a double-layer rectifier plate structure is designed after the first filter component 2 and the second filter component 3, and the inner diameters of the two rectifier plates are successively expanded to allow the sound waves to diffuse in the expanded diameter space. During the diffusion process, the sound intensity and sound pressure are further consumed, thereby reducing the sound power and producing a noise reduction effect; high-frequency noise is more easily absorbed by the pipeline and valve body and is not easy to penetrate the pipe wall. At the same time, the two-stage rectification design gradually unifies the airflow direction to the horizontal direction, so that the airflow after noise reduction is stable, which is conducive to gas transportation.

[0078] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims

1. A multi-channel variable diameter silencer, characterized in that: include: A reducer, wherein an air inlet and an air outlet are respectively arranged at both ends of the reducer, an inlet flange is arranged at the air inlet, an outlet flange is arranged at the air outlet, and the inner diameter of the reducer near the air inlet is smaller than the inner diameter of the reducer near the air outlet; A first filter assembly is disposed in the inlet flange, and the first filter assembly is used to divide and disrupt the airflow; A second filter assembly is disposed in the reducer, and the second filter assembly is used to divide the disrupted airflow into a plurality of small airflows; A rectifier plate assembly, arranged on a side of the second filter assembly close to the outlet flange; A fixing rod assembly is disposed in the reducer, and the fixing rod assembly detachably connects the first filter assembly, the second filter assembly, the rectifier plate assembly and the reducer.

2. The multi-channel variable diameter silencer according to claim 1, characterized in that: The first filtering component comprises: A first filter plate is disposed in the inlet flange, and the first filter plate is located on a side of the inlet flange close to the air inlet; A second filter plate is disposed in the inlet flange and spaced apart from the first filter plate, the second filter plate being located on a side of the inlet flange away from the air inlet; An elastic filler is arranged in the inlet flange, and the elastic filler is located between the first filter plate and the second filter plate.

3. The multi-channel variable diameter silencer according to claim 2, characterized in that: The first filtering component also includes: A connecting plate, arranged around the elastic filler, and used to connect the first filter plate, the second filter plate, and the elastic filler into one; One end of the connecting plate is fixedly connected to the first filter plate, and the other end of the connecting plate is detachably connected to the second filter plate; Or, one end of the connecting plate is detachably connected to the first filter plate, and the other end of the connecting plate is fixedly connected to the second filter plate; Alternatively, one end of the connecting plate is detachably connected to the first filter plate, and the other end of the connecting plate is detachably connected to the second filter plate.

4. The multi-channel variable diameter silencer according to claim 2, characterized in that: The first filter plate is provided with a plurality of first strip-shaped holes arranged in parallel and at intervals; The second filter plate is provided with a plurality of second strip holes which are arranged in parallel and spaced apart from each other, and the second strip holes are arranged in parallel with the first strip holes.

5. The multi-channel variable diameter silencer according to claim 1, characterized in that: The second filtering component comprises: A cylindrical body, wherein a plurality of first filtering holes and a plurality of second filtering holes are arranged on the cylindrical body, and the plurality of first filtering holes and the plurality of second filtering holes are staggered and interconnected; A plurality of the first filtering holes are arranged at intervals along the length direction of the cylindrical body and penetrate through both ends of the cylindrical body; A plurality of the second filtering holes are arranged at intervals along the circumferential direction of the cylindrical body and penetrate through both sides of the cylindrical body.

6. The multi-channel variable diameter silencer according to claim 5, characterized in that: The second filtering component also includes: An annular boss is disposed at the end of the cylindrical body, and the outer diameter of the annular boss is greater than the outer diameter of the cylindrical body; A first limiting boss is provided at one end of the reducer near the air inlet, and the size of the first limiting boss is larger than the inner diameter of the end of the reducer near the air inlet, so that when the annular boss abuts against the first limiting boss, the first limiting boss can limit the movement of the second filter assembly towards the direction close to the outlet flange.

7. The multi-channel variable diameter silencer according to claim 1, characterized in that: The rectifier plate assembly comprises: A first rectifying plate, arranged in the outlet flange, wherein a plurality of first through holes evenly spaced are arranged on the first rectifying plate, and the first through holes are arranged along the flow direction of the airflow; A second limiting boss is provided in the outlet flange, and the size of the second limiting boss is larger than the inner diameter of the cavity on the side close to the inlet flange, so that when the first rectifying plate abuts against the second limiting boss, the second limiting boss can limit the movement of the first rectifying plate towards the direction close to the inlet flange.

8. The multi-channel variable diameter silencer according to claim 7, characterized in that: The rectifier plate assembly also includes: A second rectifying plate is arranged in the reducer, and a plurality of second through holes are arranged at even intervals on the second rectifying plate, and the second through holes are arranged along the flow direction of the airflow; A third limiting boss is arranged in the reducer, and the size of the third limiting boss is larger than the inner diameter of the cavity on the side close to the inlet flange, so that when the second rectifying plate abuts against the third limiting boss, the third limiting boss can limit the movement of the second rectifying plate towards the direction close to the inlet flange.

9. The multi-channel variable diameter silencer according to any one of claims 1 to 8, characterized in that: The fixing rod assembly comprises: A fixed screw rod, the fixed screw rod sequentially passes through the first filter assembly, the second filter assembly, and the rectifier plate assembly; A first fixing nut, threadedly connected to the fixing screw, wherein the first fixing nut is located at a side of the first filter component away from the second filter component; A second fixing nut, threadedly connected to the fixing screw, wherein the second fixing nut is located on a side of the first filter component close to the second filter component; An adjusting sleeve, which is sleeved on the fixed screw rod, and the adjusting sleeve is located between the second filter assembly and the rectifier plate assembly; A third fixing nut is threadedly connected to the fixing screw, and the third fixing nut is located on a side of the rectifier plate assembly away from the second filter assembly.

10. The multi-channel variable diameter silencer according to claim 9, characterized in that: The rectifier plate assembly comprises a first rectifier plate and a second rectifier plate arranged at intervals, wherein the second rectifier plate is located between the second filter assembly and the first rectifier plate; The adjusting sleeve comprises a first adjusting sleeve and a second adjusting sleeve, wherein the first adjusting sleeve and the second adjusting sleeve are both sleeved on the fixed screw rod; The first adjustment sleeve is located between the first rectifying plate and the second rectifying plate, and two ends of the first adjustment sleeve are respectively abutted against the first rectifying plate and the second rectifying plate; The second adjustment sleeve is located between the second rectifier plate and the second filter assembly, and two ends of the second adjustment sleeve are respectively abutted against the second rectifier plate and the second filter assembly.

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