Silencer

Abstract

The utility model discloses a silencer. The silencer comprises a shell, an end cover, a tail cover, a silencing pipe and a sound absorption assembly. The shell is tubular, the shell is provided with an air inlet end and an air outlet end, a flow guide body is arranged in the shell, and one side, facing the air inlet end, of the flow guide body is provided with a conical part. The end cover is used for covering the air inlet end and provided with an air inlet hole. The tail cover is used for covering the air outlet end. The silencing pipe is coaxially arranged in the shell, one end of the silencing pipe is connected with the flow guide body, and the tail cover is connected to the other end of the silencing pipe in a sleeved mode. The sound absorption assembly is arranged in the shell and connected to the flow guide body and the silencing pipe in a sleeving mode. According to the silencer, the air flow is guided to the sound absorption assembly through the flow guide body, the air flow flows into the silencing pipe from the sound absorption assembly and is exhausted through the air outlet, and therefore noise reduction is achieved, and meanwhile the risk that noise is generated and diffused outwards due to the fact that the air flow makes contact with the inner side wall of the shell is reduced.

Description

Technical Field

[0001] This application relates to the field of noise cancellation equipment technology, and more particularly to a silencer. Background Technology

[0002] A vacuum generator is a device that uses a positive pressure gas source to generate negative pressure. Through the guiding effect of the positive pressure airflow, the air in the evacuated environment is discharged along with the positive pressure airflow.

[0003] However, due to the high velocity of the positive pressure airflow, the air noise of the vacuum generator is also relatively high. It is usually necessary to install a silencer at the outlet of the vacuum generator. However, the sound reduction effect of conventional silencers such as brass sintered silencers and plastic injection molded integrated silencers is poor and cannot meet the sound reduction requirements of the high-noise vacuum generator. Utility Model Content

[0004] In view of this, this application provides a muffler to solve the problem of poor noise reduction effect of existing mufflers.

[0005] This application provides a muffler, including: a housing, an end cap, a tail cap, a muffler tube, and a sound-absorbing component. The housing is tubular, having an inlet end and an outlet end axially opposite each other. A guide fluid is disposed within the housing, and a tapered portion is formed between the guide fluid and the housing in the radial direction, with the side of the guide fluid facing the inlet end having a tapered portion. The end cap is connected to the housing and configured to cover the inlet end, with an inlet hole extending through the housing along its axis. The tail cap is connected to the housing and configured to cover the outlet end. The muffler tube is coaxially disposed within the housing, with one end connected to the guide fluid, and the tail cap fitted onto the other end of the muffler tube. The sound-absorbing component is disposed within the housing and fitted onto the outside of the guide fluid and the muffler tube. The tapered portion guides the airflow entering through the inlet hole to the sound-absorbing component.

[0006] In the above embodiments, a guide fluid is used to direct the airflow to the sound-absorbing component, thereby reducing the risk of noise generation and outward diffusion caused by the airflow contacting the inner wall of the housing. At the same time, the airflow is silenced sequentially by the sound-absorbing component and the silencer pipe, which helps to improve the silencer's silencing effect.

[0007] In some embodiments, the sound-absorbing assembly includes a first sound-absorbing element and a second sound-absorbing element spaced apart, the first sound-absorbing element being coaxially sleeved on the fluid guide. The second sound-absorbing element is coaxially sleeved on the silencer pipe.

[0008] In the above embodiment, by setting two sound-absorbing components at intervals, the first sound-absorbing component buffers and initially absorbs the airflow entering the main body, thereby reducing the impact of the airflow on the second sound-absorbing component and the silencer pipe, which helps to reduce noise generation and reduces the risk of deformation of the second sound-absorbing component due to the impact of the airflow.

[0009] In some embodiments, the housing further includes a connecting rib connected to the fluid guide, the connecting rib being located between the first sound-absorbing element and the second sound-absorbing element. The connecting rib is configured to contact the side of the first sound-absorbing element facing the second sound-absorbing element.

[0010] In the above embodiments, the connecting ribs fix the fluid guide and support the first sound-absorbing component, thereby reducing the risk of deformation of the first sound-absorbing component due to airflow impact.

[0011] In some embodiments, the two ends of the second sound-absorbing member along the axial direction of the housing contact the connecting rib and the tail cap, respectively.

[0012] In the above embodiments, fixing both ends of the second sound-absorbing component with connecting ribs and tail caps helps to reduce the risk of deformation of the second sound-absorbing component.

[0013] In some embodiments, the first sound-absorbing element and / or the second sound-absorbing element are in contact with the inner sidewall of the housing, respectively.

[0014] In the above embodiments, the inner and outer walls of the first sound-absorbing component are surrounded by a housing and a fluid guide, or the inner and outer walls of the second sound-absorbing component are surrounded by a housing and a silencer tube, which helps to reduce the risk of deformation of the first and second sound-absorbing components.

[0015] In some embodiments, the fluid guide is provided with a mounting groove for accommodating a portion of the first sound-absorbing element.

[0016] In the above embodiments, fixing the first sound-absorbing component by means of the mounting groove helps to improve the stability of the first sound-absorbing component.

[0017] In some embodiments, the first sound-absorbing element and / or the second sound-absorbing element are made of honeycomb-shaped sound-absorbing cotton.

[0018] In the above embodiments, the honeycomb-shaped sound-absorbing cotton helps to increase the space for airflow through the first and second sound-absorbing components and improve the shape stability of the first and second sound-absorbing components.

[0019] In some embodiments, the tapered portion is conical, and the extension line of the generatrix of the tapered portion intersects with the side of the sound-absorbing component facing the air inlet end along the axial direction of the housing.

[0020] In the above embodiments, it helps to improve the accuracy of the conical portion in guiding airflow to the sound-absorbing component.

[0021] In some embodiments, the cone angle of the tapered portion is 40° to 60°.

[0022] In the above embodiments, a smaller taper helps to reduce the resistance of the tapered portion to airflow.

[0023] In some embodiments, the muffler further includes a connecting structure, through which the end cap and / or tail cap are detachably connected to the housing. The muffler also includes a seal disposed between the end cap and the housing and / or between the tail cap and the housing.

[0024] In the above embodiments, the end caps and tail caps are detachably connected to the housing to facilitate the replacement of the muffler and sound-absorbing components. Furthermore, the sealing components help improve the housing's sealing performance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a muffler according to an embodiment of this application.

[0026] Figure 2 for Figure 1 An exploded view of the muffler.

[0027] Figure 3 for Figure 1 A schematic diagram of the muffler after being cut along section line Ⅲ-Ⅲ.

[0028] Figure 4 for Figure 1 A schematic diagram of the shell after being cut along section line Ⅲ-Ⅲ.

[0029] Explanation of main component symbols

[0030] 10. Muffler; 11. Housing; 111. Inlet end; 112. Outlet end; 114. Connecting rib; 12. End cap; 121. Inlet hole; 13. Tail cap; 131. Outlet hole; 14. Muffler pipe; 15. Sound absorption assembly; 151. First sound absorption component; 152. Second sound absorption component; 153. Gap; 16. Fluid guide; 161. Conical part; 162. Mounting groove; 163. Groove; 17. Connecting structure; 171. Hook; 172. Slot; 18. Seal; X, First direction. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0032] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "above," "below," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0033] The terms “first”, “second”, etc., are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implying the quantity, specific order, or primary and secondary relationship of the indicated technical features.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0035] This application provides a muffler, including: a housing, an end cap, a tail cap, a muffler pipe, and a sound-absorbing component. The housing has an inlet end and an outlet end arranged axially opposite each other. A guide fluid is concentrically arranged within the housing, and a tapered portion is provided on the side of the guide fluid facing the inlet end in the radial direction of the housing. The end cap is connected to the housing and configured to cover the inlet end; an inlet hole is provided through the end cap along the axis of the housing. The tail cap is connected to the housing and configured to cover the outlet end. The muffler pipe is coaxially disposed within the housing, one end of the muffler pipe is connected to the guide fluid, and the tail cap is sleeved on the other end of the muffler pipe. The sound-absorbing component is disposed within the housing and sleeved on the outside of the guide fluid and the muffler pipe. The tapered portion is configured to guide the airflow entering through the inlet hole to the sound-absorbing component.

[0036] In the above embodiments, a guide fluid is used to direct the airflow to the sound-absorbing component, thereby reducing the risk of noise generation and outward diffusion caused by the airflow contacting the inner wall of the housing. At the same time, the airflow is silenced sequentially by the sound-absorbing component and the silencer pipe, which helps to improve the silencer's silencing effect.

[0037] Some embodiments of this application will now be described with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0038] Please see Figures 1 to 3This application provides a muffler 10, including: a housing 11, an end cap 12, a tail cap 13, a muffler pipe 14, and a sound-absorbing component 15. The housing 11 is tubular and has an inlet end 111 and an outlet end 112 arranged axially opposite each other. The end cap 12 is connected to the housing 11 and covers the inlet end 111; an inlet hole 121 is provided through the end cap 12 along the axis of the housing 11. The tail cap 13 is connected to the housing 11 and covers the outlet end 112; an outlet hole 131 is provided through the tail cap 13 along the axis of the housing 11. The muffler pipe 14 is coaxially disposed within the housing 11, with one end of the muffler pipe 14 communicating with the outlet hole 131, and the outer side wall of the muffler pipe 14 contacting the inner side wall of the outlet hole 131. The sound-absorbing component 15 is sleeved on the muffler pipe 14. When the airflow flows into the housing 11 along the first direction X through the air inlet 121, the airflow passes through the sound-absorbing component 15 along the first direction X, so that the sound-absorbing component 15 first silences the airflow. The airflow flowing through the sound-absorbing component 15 along the first direction X is blocked by the tail cover 13. The airflow then flows from the sound-absorbing component 15 into the muffler 14 along the radial direction of the housing 11, so that the muffler 14 silences the airflow. Finally, the airflow flows out from the muffler 14 along the air outlet 131, thereby realizing the muffler 10's silencer function.

[0039] The first direction X is parallel to the axis of the housing 11.

[0040] In some embodiments, the end cap 12 is used to communicate with the outlet of a gas source such as the outlet of a vacuum generator.

[0041] In some embodiments, the vent 131 is a stepped vent, and the diameter of the portion of the vent 131 away from the air inlet 111 is smaller than the diameter of the portion near the air inlet 111.

[0042] In some embodiments, please refer to Figure 2 and Figure 3 The sound-absorbing component 15 includes a first sound-absorbing element 151 and a second sound-absorbing element 152. A gap 153 exists between the first sound-absorbing element 151 and the second sound-absorbing element 152 along a first direction X. The first sound-absorbing element 151 is closer to the air inlet end 111 than the second sound-absorbing element 152. When airflow enters the housing 11 through the air inlet hole 121, the airflow first passes through the first sound-absorbing element 151. The first sound-absorbing element 151 buffers the airflow and provides initial noise reduction, thereby reducing the risk of the airflow impacting the second sound-absorbing element 152 and causing deformation, which would reduce the sound absorption effect of the second sound-absorbing element 152. Simultaneously, it reduces the risk of noise generated by direct contact and collision between the airflow and the second sound-absorbing element 152.

[0043] It is understandable that even if the airflow directly contacts the first sound-absorbing element 151 and generates noise, this noise can be absorbed by the second sound-absorbing element 152 and the silencer 14 located behind the first sound-absorbing element 151 along the airflow direction, thereby reducing the risk of additional noise generated when the airflow passes through the silencer 10.

[0044] In some embodiments, please refer to Figure 2 The first sound-absorbing element 151 and / or the second sound-absorbing element 152 are made of sound-absorbing cotton. Furthermore, the sound-absorbing cotton has a honeycomb structure, which helps increase the space for airflow through the first sound-absorbing element 151 and the second sound-absorbing element 152, thereby reducing the risk of airflow being blocked by the first and second sound-absorbing elements 151 and 152 and colliding with the inner wall of the housing 11. At the same time, the honeycomb structure helps improve the structural stability of the first and second sound-absorbing elements 151 and 152.

[0045] In some embodiments, please refer to Figure 3 The outer side wall of the first sound-absorbing component 151 and / or the outer side wall of the second sound-absorbing component 152 respectively contact the inner side wall of the housing 11 to reduce the risk of airflow colliding and rubbing against the inner side wall of the housing 11.

[0046] In some embodiments, the silencer 14 is a sintered structural component. The porous structure formed after sintering enables the silencer 14 to reduce noise.

[0047] In some embodiments, the muffler 14 is made of a high-strength resin material such as composite PE, so that while maintaining a certain strength, the muffler 14 can reduce its cost compared to metal.

[0048] In some embodiments, the diameter of the silencer 14 is 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm, and the length is 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, or 50mm. For example, the silencer 14 has a diameter of 14mm and a length of 43.6mm.

[0049] In some embodiments, please refer to Figure 3 and Figure 4The muffler 10 also includes a guide fluid 16 disposed within the housing 11. From the air inlet 111 to the air outlet 112, the guide fluid 16 is sequentially connected to the muffler pipe 14. A first sound-absorbing element 151 is sleeved on the outside of the guide fluid 16, and a second sound-absorbing element 152 is sleeved on the outside of the muffler pipe 14. The guide fluid 16 has a tapered portion 161 facing the air inlet 121, and the tapered portion 161, the air inlet 121, and the housing 11 are all coaxially arranged. When airflow enters the housing 11 along the air inlet 121, the airflow contacts the conical surface of the tapered portion 161 and is guided radially by the tapered portion 161 to the first sound-absorbing element 151, so that the airflow can be guided by the tapered portion 161 and then flow evenly through the annular first sound-absorbing element 151 and the second sound-absorbing element 152.

[0050] Meanwhile, the airflow is directly guided to the first sound-absorbing member 151 through the tapered portion 161, which helps to reduce the risk of noise generated by the airflow colliding with the inner wall of the housing 11.

[0051] In some embodiments, please refer to Figure 3 The end of the muffler 14 away from the air outlet 131 is connected to the guide fluid 16, so that the guide fluid 16 seals the end face of the muffler 14, thereby reducing the risk of airflow flowing from the muffler 14 into the muffler 14 along the gap 153 towards the end face of the guide fluid 16.

[0052] In some embodiments, please refer to Figure 4 A circular groove 163 is provided on the side of the fluid guide 16 away from the conical part 161. The silencer 14 is inserted into the groove 163 to connect the silencer 14 and the fluid guide 16.

[0053] In some embodiments, please refer to Figure 3 The conical part 161 is conical, and the extension line of the generatrix of the conical part 161 intersects the side of the first sound-absorbing member 151 facing the air inlet end 111, so that the airflow can flow along the conical surface of the conical part 161 to the first sound-absorbing member 151, which helps to improve the accuracy of the conical part 161 in guiding the airflow.

[0054] Furthermore, the extension line of the generatrix of the tapered portion 161 intersects with the portion of the end face of the first sound absorber 151 near the fluid guide 16, so that the tapered portion 161 directs most of the airflow to the portion of the first sound absorber 151 away from the inner wall of the housing 11.

[0055] In some embodiments, the taper of the conical portion 161 is 40° to 60°. When the taper of the conical portion 161 is less than 40°, the resistance of the conical portion 161 to airflow increases, posing a risk of airflow colliding with the conical portion 161. When the taper of the conical portion 161 is greater than 60°, the conical portion 161 easily guides the airflow to the inner wall of the housing 11, posing a risk of airflow colliding with the housing 11. Exemplarily, the taper of the conical portion 161 is 45°, which helps to create suitable resistance to airflow, allowing the airflow to flow smoothly and precisely to the first sound-absorbing member 151.

[0056] In some embodiments, please refer to Figure 3 and Figure 4 The guide fluid 16 is provided with a mounting groove 162, which is located in the middle of the guide fluid 16 along the axial direction of the housing 11 and is arranged towards the inner side wall of the housing 11 along the radial direction of the housing 11. The first sound-absorbing member 151 is embedded in the mounting groove 162, which helps to improve the fixation of the first sound-absorbing member 151.

[0057] In some embodiments, please refer to Figure 3 and Figure 4 The housing 11 is also provided with a plurality of connecting ribs 114, which are radially distributed and connected to the inner sidewall of the housing 11 and the guide fluid 16 respectively, so as to fix the guide fluid 16 and allow the airflow to flow through the space between the two connecting ribs 114 along the first direction X.

[0058] In some embodiments, please refer to Figure 3 and Figure 4 The connecting rib 114 is located between the first sound-absorbing component 151 and the second sound-absorbing component 152. The connecting rib 114 contacts the side of the first sound-absorbing component 151 away from the air inlet end 111. The connecting rib 114 supports the first sound-absorbing component 151, thereby reducing the risk of the first sound-absorbing component 151 being deformed by airflow impact.

[0059] In some embodiments, the two ends of the second sound-absorbing member 152 along the first direction X contact the connecting rib 114 and the tail cap 13 respectively, so that the tail cap 13 and the connecting rib 114 jointly position the two ends of the second sound-absorbing member 152, thereby reducing the risk of deformation or displacement of the second sound-absorbing member 152.

[0060] In some embodiments, please refer to Figure 2 and Figure 3 The muffler 10 also includes a connecting structure 17, and the end cap 12 and / or the tail cap 13 are detachably connected to the housing 11 through the connecting structure 17, so as to replace the first sound-absorbing component 151, the second sound-absorbing component 152 or the muffler tube 14 inside the housing 11 by removing the end cap 12 or the tail cap 13.

[0061] In some embodiments, please refer to Figure 2 The connecting structure 17 includes a slot 172 and a hook 171. The hook 171 is respectively disposed on the outer side wall of the end cap 12 and the tail cap 13, and the slot 172 is respectively disposed on both ends of the housing 11. The end cap 12 and / or the tail cap 13 are detachably connected to the housing 11 by the hook 171 and the slot 172.

[0062] In some embodiments, the connection structure 17 further includes threaded structures corresponding to the end cap 12 and the housing 11, or the tail cap 13 and the housing 11.

[0063] In some embodiments, please refer to Figure 2 and Figure 3 The muffler 10 also includes a seal 18, which is disposed between the outer wall of the end cap 12 and the inner wall of the housing 11 to seal the end cap 12 and the housing 11. The seal 18 is also disposed between the outer wall of the tail cap 13 and the inner wall of the housing 11 to seal the tail cap 13 and the housing 11. This helps to improve the sealing performance of the housing 11 and reduce the risk that airflow will be discharged directly along the gap between the end cap 12 and the housing 11 or along the gap between the tail cap 13 and the housing 11 without being silenced and further generating noise.

[0064] In some embodiments, the seal 18 is a sealing ring or a sealing gasket, and the seal 18 is detachably mounted on the end cap 12 and / or the tail cap 13.

[0065] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the substantive scope of this application fall within the scope of this application.

Claims

1. A silencer, characterized in that, include: The housing has an air inlet and an air outlet arranged opposite each other along the axial direction. A guide fluid is concentrically arranged inside the housing, and the side of the guide fluid facing the air inlet has a tapered portion. An end cap is connected to the housing and is configured to cover the air inlet end. An air inlet hole is provided through the end cap along the axis of the housing. A tail cap, which is connected to the housing and configured to close onto the vent end; A muffler is coaxially disposed within the housing, with one end of the muffler connected to the fluid guide and the tail cap sleeved over the other end of the muffler. A sound-absorbing component is disposed inside the housing and sleeved on the outside of the fluid guide and the silencer tube; The tapered portion is used to guide the airflow entering along the air inlet to the sound-absorbing component.

2. The silencer according to claim 1, characterized in that: The sound-absorbing component includes a first sound-absorbing element and a second sound-absorbing element arranged at intervals, wherein the first sound-absorbing element is coaxially sleeved on the guide fluid. The second sound-absorbing component is coaxially sleeved on the silencer pipe.

3. The silencer according to claim 2, characterized in that: The housing also includes a connecting rib connected to the fluid guide, and the connecting rib is located between the first sound-absorbing element and the second sound-absorbing element; The connecting rib is configured to contact the side of the first sound-absorbing element facing the second sound-absorbing element.

4. The silencer according to claim 3, characterized in that: The second sound-absorbing component contacts the connecting rib and the tail cap at both ends along the axial direction of the housing, respectively.

5. The silencer according to claim 2, characterized in that: The first sound-absorbing element and / or the second sound-absorbing element respectively contact the inner sidewall of the housing.

6. The silencer according to claim 2, characterized in that: The fluid guide is provided with a mounting groove for accommodating a portion of the first sound-absorbing component.

7. The silencer according to claim 2, characterized in that: The first sound-absorbing component and / or the second sound-absorbing component are made of honeycomb-shaped sound-absorbing cotton.

8. The silencer according to claim 1, characterized in that: The tapered portion is conical, and the extension line of the generatrix of the tapered portion intersects the side of the sound-absorbing component facing the air intake end along the axial direction of the housing.

9. The silencer according to claim 1, characterized in that: The cone angle of the tapered portion is 40° to 60°.

10. The silencer according to claim 1, characterized in that: The muffler also includes a connecting structure, wherein the end cap and / or the tail cap are detachably connected to the housing via the connecting structure; The muffler also includes a seal disposed between the end cap and the housing and / or between the tail cap and the housing.

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