Waste gas exhaust back pressure silencer

Abstract

The utility model provides a waste gas exhaust back pressure silencer which comprises a first-stage silencing assembly communicated with an exhaust port of a pneumatic tool and a second-stage silencing assembly connected to the other side of the first-stage silencing assembly. The first-stage silencing assembly comprises a connecting body and a first shell arranged on the outer side of the connecting body in a sleeving mode, a pressure return cavity is formed between the first shell and the connecting body, and a channel communicated with the exhaust port is formed in the connecting body. The second-stage silencing assembly comprises a second shell connected to the connecting body and a plurality of flow dividing bases arranged in the axial direction of the shell, and a first silencing piece is arranged in a hole between every two adjacent flow dividing bases. An inner cavity is formed in the second shell, the channel communicates with the inner cavity, and second silencing pieces are arranged on the two sides of the flow dividing base correspondingly. According to the utility model, layer-by-layer silencing is carried out through the first silencing piece, and meanwhile, the two second silencing pieces are respectively arranged at the two ends of the second shell, so that the silencing purpose is achieved, the influence of noise on the environment when the pneumatic tool exhausts is met, and the comfort level of operators and the environmental safety are improved.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic tool technology, and in particular to an exhaust backpressure silencer. Background Technology

[0002] Pneumatic tools generate significant noise and vibration during operation. High-frequency noise is produced due to the friction and collision between the blades and stator inside the pneumatic motor. Furthermore, the rapid expansion of compressed air on the exhaust side of the pneumatic motor causes gas vibration, generating strong exhaust noise. This not only affects the quality of the working environment but may also damage the hearing health of workers. Pneumatic tool silencers can significantly reduce the noise generated by pneumatic tools through absorption.

[0003] Existing pneumatic tool silencers typically require considerable space for installation and layout, which limits their application in compact devices and affects the tool's portability and ease of use. Furthermore, existing silencers, by directly placing sound-absorbing cotton within the air outlet chamber, increase airflow resistance, causing a sudden drop in air pressure and impacting the tool's performance and efficiency. Utility Model Content

[0004] In view of this, the present invention aims to provide an exhaust backpressure silencer with a simple and compact structure, suitable for various specifications of pneumatic motors, effectively reducing exhaust noise, and ensuring the performance and efficiency of pneumatic tools.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] An exhaust backpressure silencer includes a primary silencer assembly connected to the exhaust port of a pneumatic tool, and a secondary silencer assembly connected to the other side of the primary silencer assembly.

[0007] The primary noise reduction assembly includes a connector and a first housing sleeved on the outside of the connector. A back pressure cavity is formed between the first housing and the connector. A channel communicating with the exhaust port is formed inside the connector. The channel is arranged through the connector along the axial direction.

[0008] The secondary noise reduction assembly includes a second housing connected to the connector and a plurality of diverter seats arranged along the axial direction of the housing, wherein a first noise reduction element is provided in the gap between each diverter seat;

[0009] The second housing has an inner cavity formed inside, the channel communicates with the inner cavity, and a second silencer is provided on both sides of the diverter seat.

[0010] Furthermore, the connector includes a connecting section and a back pressure section;

[0011] The diameter of the back pressure section is adapted to the inner diameter of the first housing. Two opposing arc grooves are formed on the back pressure section, so that the back pressure section forms two parallel forming planes.

[0012] The arc groove forms a first back pressure space, and the back pressure section is formed with a connecting groove arranged radially thereon, the connecting groove connecting the upper and lower first back pressure spaces;

[0013] The end of the back pressure section and the end of the second housing form a second back pressure space;

[0014] The first back pressure space is connected to the second back pressure space, and the channel is intersected with the connecting groove.

[0015] Furthermore, the connecting segment includes a connecting portion located in the middle and threaded portions located at both ends of the connecting portion;

[0016] The two threaded portions are respectively screwed into the first housing and the second housing.

[0017] Furthermore, the diverter seat includes a conical portion and a cylindrical portion arranged sequentially;

[0018] An annular partition plate is connected to the outer side of the cylindrical portion;

[0019] The outer side of the annular partition plate abuts against the inner wall of the second housing, and the gap between two adjacent diverter seats forms a buffer cavity.

[0020] Furthermore, the two spaced-apart partitions are fitted over the outer side of the cylindrical portion;

[0021] A plurality of buffer holes are provided radially along the cylindrical portion, and the buffer holes are located between the two partition plates; one end of the tapered portion is provided with a vent hole arranged axially, and the vent hole communicates with the buffer cavity;

[0022] The two partition plates, the cylindrical portion, and the second housing form a flow divider cavity, and a third noise-reducing component is provided inside the flow divider cavity.

[0023] Furthermore, the second housing is provided with at least one diversion hole, which communicates with the diversion cavity.

[0024] Furthermore, the diameter of the cylindrical portion near the tapered portion is adapted to the inner diameter of the flow cavity.

[0025] Furthermore, a cylindrical block is provided at one end of the first housing away from the second housing, and a through hole is provided inside the cylindrical block, which communicates with the second back pressure space.

[0026] Furthermore, a connecting pipe is provided inside the through hole, with one end of the connecting pipe located inside the channel and the other end connected to the exhaust port.

[0027] Furthermore, the cylindrical block is provided with a first fastener evenly distributed in the radial direction, and the connecting body is provided with a second fastener evenly distributed in the radial direction. The first fastener and the second fastener are used to lock the connecting pipe.

[0028] Compared with the prior art, this utility model has the following advantages:

[0029] The exhaust backpressure silencer of this utility model, through the setting of a primary silencing component, establishes a backpressure chamber between the first housing and the connecting body. Gas from the pneumatic tool's exhaust port is partially dispersed into the backpressure chamber through the channel, thereby slowing down the gas flow rate and achieving silencing through backpressure. Simultaneously, a flow divider is set within the second housing. Airflow entering the inner cavity from the channel continues to move and is sequentially divided by several flow dividers, dispersing the airflow into the space within each flow divider. The first silencing component further reduces noise layer by layer. Additionally, two second silencing components are set at each end of the second housing, further enhancing silencing and reducing the impact of pneumatic tool exhaust noise on the environment, improving operator comfort and environmental safety.

[0030] Secondly, by setting a connecting body and a back pressure chamber formed by the first housing at the exhaust port, the gas discharge resistance is not increased by directly using sound-absorbing cotton to silence the exhaust port. After back-pressurizing the airflow at the exhaust port, the airflow that will continue to be discharged will be diverted and silenced, further achieving silence and improving the silencing effect while ensuring the performance and efficiency of the pneumatic tool. Attached Figure Description

[0031] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0032] Figure 1 This is a three-dimensional structural diagram of the exhaust gas backpressure silencer described in an embodiment of the present utility model;

[0033] Figure 2 This is a three-dimensional structural diagram of the exhaust gas backpressure silencer described in this embodiment of the utility model, excluding the first and second housings.

[0034] Figure 3 This is a right-side view of the exhaust gas backpressure silencer described in an embodiment of this utility model;

[0035] Figure 4 for Figure 3 Sectional view at point AA;

[0036] Figure 5 for Figure 3 Sectional view at point BB.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Primary silencing component; 2. Secondary silencing component; 3. First silencing element; 4. Second silencing element; 5. Third silencing element; 6. Cylindrical block; 7. Through hole; 8. Connecting pipe; 9. First fastener; 10. Second fastener; 11. Plug;

[0039] 101. Connector; 102. First housing; 103. Back pressure chamber; 104. Channel;

[0040] 201. Second housing; 202. Diverter seat;

[0041] 1011. Connecting section; 1012. Back pressure section; 1013. Forming plane; 1014. First back pressure space; 1015. Connecting groove; 1016. Second back pressure space;

[0042] 2011, Inner cavity; 2012, Diversion orifice; 2013, Limiting ring;

[0043] 2021. Conical section; 2022. Cylindrical section; 2023. Annular partition plate; 2024. Buffer chamber; 2025. Buffer hole; 2026. Vent hole; 2027. Diverter chamber;

[0044] 10111, Connecting part; 10112, Threaded part. Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0046] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "back," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0048] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0049] This embodiment relates to an exhaust backpressure silencer, which, as a whole, is as follows: Figures 1 to 5 As shown, the exhaust backpressure silencer includes a primary silencer assembly 1 connected to the exhaust port of a pneumatic tool, and a secondary silencer assembly 2 connected to the other side of the primary silencer assembly 1. The primary silencer assembly 1 includes a connector 101 and a first housing 102 sleeved on the outside of the connector 101. A backpressure chamber 103 is formed between the first housing 102 and the connector 101. A channel 104 connected to the exhaust port is formed inside the connector 101.

[0050] The secondary noise reduction assembly 2 includes a second housing 201 connected to the connector 101, and a plurality of diverter seats 202 arranged along the axial direction of the housing. A first noise reduction element 3 is provided in the gap between each diverter seat 202. An inner cavity 2011 is formed inside the second housing 201, and a channel 104 communicates with the inner cavity 2011. A second noise reduction element 4 is provided on both sides of the diverter seat 202.

[0051] The exhaust backpressure silencer of this embodiment uses a primary silencer component 1 and a backpressure chamber 103 between the first housing 102 and the connecting body 101. Gas from the pneumatic tool's exhaust port is partially dispersed into the backpressure chamber 103 through the channel 104, slowing the gas flow rate and achieving noise reduction through backpressure. Simultaneously, a second silencer component is connected to the rear end of the first silencer component. A flow divider 202 is provided inside the second housing 201. Airflow entering the inner cavity 2011 from the channel 104 continues to move and is sequentially divided by several flow dividers 202, dispersing the airflow into the surrounding space. Noise is then gradually reduced by the first silencer component 3. Additionally, two second silencers 4 are provided at both ends of the second housing 201, further enhancing noise reduction and mitigating the environmental impact of pneumatic tool exhaust noise, thus improving operator comfort and environmental safety.

[0052] Secondly, by setting the back pressure chamber 103 formed by the connector 101 and the first housing 102 at the exhaust port, the gas discharge resistance is not increased by directly using sound-absorbing cotton to silence the exhaust port. After the airflow at the exhaust port is back-pressurized, the airflow that will continue to be discharged will be diverted and silenced, thereby further achieving silence and improving the silencing effect while ensuring the performance and efficiency of the pneumatic tool.

[0053] Based on the above overall introduction, an exemplary structure of the exhaust backpressure silencer in this embodiment is as follows: Figures 1 to 5 As shown, in this embodiment, both the first housing 102 and the second housing 201 adopt a rotary structure. Both the first housing 102 and the second housing 201 are screwed and fixed to the connecting body 101, thereby forming a long column, which is convenient to connect with pneumatic tools and does not require a large space. The shape can be adapted to various pneumatic tools of different specifications, which will not be described in detail here.

[0054] like Figures 1 to 5 As shown, to increase the sealing performance of the muffler, a plug 11 is provided at the open end of the second housing 201. The plug 11 is threadedly connected to the second housing 201, and a round hole is provided on the plug 11 for airflow. A second muffler 4 is provided between the plug 11 and the flow divider 202. In addition, to facilitate limiting the axial displacement of the multiple flow dividers 202, a limiting ring 2013 is formed inside the second housing 201 to block their axial movement.

[0055] As a preferred embodiment, such as Figures 1 to 5 As shown, the connector 101 includes a connecting section 1011 and a backpressure section 1012. The diameter of the backpressure section 1012 is adapted to the inner diameter of the first housing 102. Two opposing arc grooves are formed on the backpressure section 1012, creating two parallel forming planes 1013. The arc grooves form a first backpressure space 1014. A connecting groove 1015 is formed on the backpressure section 1012, arranged radially therein, connecting the upper and lower first backpressure spaces 1014. The end of the backpressure section 1012 and the end of the second housing 201 form a second backpressure space 1016. The first backpressure space 1014 and the second backpressure space 1016 are connected, and the channel 104 intersects with the connecting groove. The connector 101 is connected both in the middle and outside, achieving balanced and stable air pressure, effectively reducing vibrations generated by pneumatic tools and improving their performance.

[0056] As mentioned above, by setting two vertically arranged arc grooves on the back pressure section 1012, so that the back pressure section 1012 has two parallel forming planes 1013, when the connecting body 101 is connected to the second housing 201, the connecting body 101 can be limited by a wrench and then tightened, thereby improving the connection tightness between the second housing and the connecting body 101.

[0057] In addition, such as Figure 2 As shown, in this embodiment, three interconnecting grooves 1015 are provided at intervals along the axial direction of the back pressure section 1012. The interconnecting grooves 1015 are formed from one plane to another. In this embodiment, each interconnecting groove 1015 is shaped into a rectangle. In other embodiments, the shape of the interconnecting groove 1015 can be, for example, cylindrical, stepped, or irregular groove, etc., which is not limited here.

[0058] Preferably, such as Figures 1 to 5 As shown, the channel 104 on the connector 101 passes through the connector 101 and communicates with the inner cavity 2011. The channel 104 is intersected with the connecting groove 1015 so that the airflow first flows through the channel 104 and then flows through the three connecting grooves 1015 to the two first back pressure spaces 1014, thereby achieving the effect of quickly reducing the gas flow rate and reducing the pressure. This can effectively ensure the normal use of pneumatic tools and avoid the defect of the prior art that the use of sound-absorbing cotton directly causes a large resistance to air pressure.

[0059] like Figure 2 As shown, the connecting section 1011 includes a connecting portion 10111 in the middle and threaded portions 10112 at both ends of the connecting portion 10111. The two threaded portions 10112 are screwed to the first housing 102 and the second housing 201, respectively. In this embodiment, the outer diameter of the connecting portion 10111 is equal to the outer diameter of the first housing 102 and the second housing 201. After screwing and fixing, it is easy to form an integral cylindrical structure, which facilitates installation and meets the requirements of aesthetic appearance.

[0060] As a preferred embodiment, such as Figures 3 to 5 As shown, the diverter seat 202 includes a conical portion 2021 and a cylindrical portion 2022 arranged sequentially. An annular partition plate 2023 is connected to the outer side of the cylindrical portion 2022. The outer side of the annular partition plate 2023 abuts against the inner wall of the second housing 201. The gap between two adjacent diverter seats 202 forms a buffer cavity 2024. By setting the diverter seats 202 and forming multiple buffer cavities 2024 within several diverter seats 202, a step-by-step noise reduction effect is achieved.

[0061] It should be noted that since the main noise of pneumatic tools comes from periodic exhaust noise, mechanical noise caused by parts imbalance, and intake noise generated during the intake process, the use of a step-by-step silencing setting can reduce exhaust speed and power through damping or wind damping, thereby achieving the purpose of reducing noise.

[0062] Furthermore, such as Figures 2 to 5 As shown, two spaced partition plates are sleeved on the outside of the cylindrical part 2022. Several buffer holes 2025 are provided radially along the cylindrical part 2022. The buffer holes 2025 are located between the two partition plates. One end of the tapered part 2021 is provided with an axially arranged vent hole 2026. The vent hole 2026 communicates with the buffer cavity 2024. The two partition plates, the cylindrical part 2022, and the second shell 201 form a diversion cavity 2027. A third sound-absorbing component 5 is provided in the diversion cavity 2027.

[0063] In this embodiment, not only are silencing components arranged axially for noise reduction, but buffer holes 2025 are also arranged radially on the cylindrical portion 2022. When gas enters each buffer chamber 2024, the airflow also enters the diversion chamber 2027 through the buffer holes 2025. This embodiment provides three buffer holes 2025 evenly distributed circumferentially on the cylindrical portion 2022 to facilitate uniform gas release. A third silencing component 5 is arranged within the annular diversion chamber 2027, ensuring not only gradual gas dispersion but also effective noise reduction. In this embodiment, the first silencing component 3, the second silencing component 4, and the third silencing component 5 are made of sound-absorbing cotton.

[0064] In addition, such as Figures 2 to 5 As shown, the second housing 201 is provided with at least one diversion hole 2012, which communicates with the diversion cavity 2027. By providing the diversion hole 2012, gas can flow out radially from the second housing 201, thereby increasing the flow channel and relieving gas pressure.

[0065] Furthermore, such as Figures 3 to 5 As shown, in order to better connect each branch seat 202, the diameter of the cylindrical portion 2022 near the tapered portion 2021 is adapted to the inner diameter of the flow cavity.

[0066] In addition, such as Figures 1 to 5 As shown, a cylindrical block 6 is provided at one end of the first housing 102 away from the second housing 201. The cylindrical block 6 has a through hole 7 inside, which communicates with the second back pressure space 1016.

[0067] To facilitate the connection between the silencer and the exhaust port of the pneumatic tool, a connecting pipe 8 is provided inside the through hole 7. One end of the connecting pipe 8 is located inside the channel 104, and the other end is connected to the exhaust port. The diameter of the connecting pipe 8 can be adjusted according to the specifications of the exhaust port of the pneumatic tool.

[0068] Preferably, such as Figures 1 to 5 As shown, the cylindrical block 6 is provided with a first fastener 9 evenly distributed in the radial direction, and the connecting body 101 is provided with a second fastener 10 evenly distributed in the radial direction. The first fastener 9 and the second fastener 10 are used to lock the connecting pipe 8.

[0069] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waste gas backpressure silencer, characterized in that: It includes a primary silencer assembly (1) connected to the exhaust port of the pneumatic tool, and a secondary silencer assembly (2) connected to the other side of the primary silencer assembly (1). The primary noise reduction assembly (1) includes a connector (101) and a first housing (102) sleeved on the outside of the connector (101). A back pressure cavity (103) is formed between the first housing (102) and the connector (101). A channel (104) communicating with the exhaust port is formed inside the connector (101). The channel (104) is arranged to pass through the connector (101) along the axial direction. The secondary noise reduction assembly (2) includes a second housing (201) connected to the connector (101) and a plurality of diverter seats (202) arranged along the axial direction of the housing, wherein a first noise reduction element (3) is provided in the gap between each diverter seat (202); The second housing (201) has an inner cavity (2011) formed inside, the channel (104) communicates with the inner cavity (2011), and the diverter seat (202) is provided with a second silencing component (4) on both sides.

2. The exhaust gas backpressure silencer according to claim 1, characterized in that: The connector (101) includes a connecting section (1011) and a back pressure section (1012); The diameter of the back pressure section (1012) is adapted to the inner diameter of the first housing (102). Two opposing arc grooves are formed on the back pressure section (1012), so that the back pressure section (1012) forms two parallel forming planes (1013). The arc groove forms a first back pressure space (1014), and the back pressure section (1012) is formed with a connecting groove (1015) arranged radially thereon, the connecting groove (1015) connecting the upper and lower first back pressure spaces (1014). The end of the back pressure section (1012) and the end of the second housing (201) form a second back pressure space (1016). The first back pressure space (1014) is connected to the second back pressure space (1016), and the channel (104) is intersected with the connecting groove (1015).

3. The exhaust gas backpressure silencer according to claim 2, characterized in that: The connecting section (1011) includes a connecting part (10111) in the middle and threaded parts (10112) at both ends of the connecting part (10111). The two threaded portions (10112) are respectively screwed into the first housing (102) and the second housing (201).

4. The exhaust gas backpressure silencer according to claim 3, characterized in that: The diverter seat (202) includes a tapered portion (2021) and a cylindrical portion (2022) arranged sequentially. An annular partition plate (2023) is connected to the outside of the cylindrical part (2022). The outer side of the annular partition plate (2023) abuts against the inner wall of the second housing (201), and the gap between two adjacent diverter seats (202) forms a buffer cavity (2024).

5. The exhaust gas backpressure silencer according to claim 4, characterized in that: Two spaced-apart partitions are fitted over the outside of the cylindrical portion (2022); A plurality of buffer holes (2025) are provided radially along the cylindrical portion (2022), and the buffer holes (2025) are located between the two partition plates; one end of the tapered portion (2021) is provided with a vent hole (2026) arranged axially, and the vent hole (2026) communicates with the buffer cavity (2024); The two partition plates, the cylindrical part (2022), and the second housing (201) form a flow divider cavity (2027), and a third sound-absorbing component (5) is provided in the flow divider cavity (2027).

6. The exhaust gas backpressure silencer according to claim 5, characterized in that: The second housing (201) is provided with at least one diversion hole (2012), which is connected to the diversion cavity (2027).

7. The exhaust gas backpressure silencer according to claim 6, characterized in that: The diameter of the cylindrical portion (2022) near the conical portion (2021) is adapted to the inner diameter of the buffer cavity (2024).

8. The exhaust gas backpressure silencer according to claim 7, characterized in that: A cylindrical block (6) is provided at one end of the first housing (102) away from the second housing (201). The cylindrical block (6) has a through hole (7) inside, which is connected to the second back pressure space (1016).

9. The exhaust gas backpressure silencer according to claim 8, characterized in that: A connecting pipe (8) is provided inside the through hole (7). One end of the connecting pipe (8) is located inside the channel (104), and the other end is connected to the exhaust port.

10. The exhaust gas backpressure silencer according to claim 9, characterized in that: The cylindrical block (6) is provided with a first fastener (9) evenly distributed in the radial direction, and the connecting body (101) is provided with a second fastener (10) evenly distributed in the radial direction. The first fastener (9) and the second fastener (10) are used to lock the connecting pipe (8).

Images