Silencing device and suction device

Abstract

The application discloses a sound attenuation device and a suction equipment. The sound attenuation device comprises a first sound attenuation pipe, a second sound attenuation pipe, first sound attenuation cotton and second sound attenuation cotton. The first sound attenuation pipe is provided with a first through hole and a plurality of first sound attenuation holes. The first through hole penetrates through opposite ends of the first sound attenuation pipe in the extending direction, and the plurality of first sound attenuation holes respectively penetrate through the pipe wall of the first sound attenuation pipe. The second sound attenuation pipe is provided with a second through hole and a plurality of second sound attenuation holes. The second through hole penetrates through opposite ends of the second sound attenuation pipe in the extending direction, the second sound attenuation pipe is accommodated in the first through hole, the first sound attenuation pipe surrounds the second sound attenuation pipe, and the plurality of second sound attenuation holes respectively penetrate through the pipe wall of the second sound attenuation pipe. The first sound attenuation cotton is accommodated in the first through hole and located between the first sound attenuation pipe and the second sound attenuation pipe. The second sound attenuation cotton is accommodated in the second through hole. Air flow successively passes through the second sound attenuation cotton, the second sound attenuation hole, the first sound attenuation cotton and the first sound attenuation hole, and energy is attenuated layer by layer to realize a four-layer sound attenuation effect.

Description

Technical Field

[0001] This application relates to the field of noise reduction technology, and more specifically, to a noise reduction device and a suction device. Background Technology

[0002] In vacuum suction processes, for fragile workpieces, the suction device uses negative pressure to fix them instead of mechanical clamping, avoiding workpiece deformation or damage. During processing, the suction device quickly creates negative pressure by using a vacuum generator, allowing the workpiece to be suctioned and fixed; after processing, the vacuum device releases the workpiece by venting air through the exhaust port of the vacuum generator. During suction and exhaust, the airflow friction with the surrounding air generates noise, causing significant noise pollution. Therefore, a silencer is usually installed at the exhaust port to reduce noise.

[0003] In traditional silencer designs, the silencer works by having airflow impact the steel plates of the silencer, forcibly deflecting the airflow and dispersing its kinetic energy to reduce noise. However, when the airflow impacts the steel plates, excessively high and concentrated airflow velocity can cause resonance during exhaust, generating noise. Utility Model Content

[0004] This application provides a silencing device and an absorption device.

[0005] In a first aspect, this application provides a noise reduction device, comprising a first noise reduction pipe, a second noise reduction pipe, a first noise reduction cotton, and a second noise reduction cotton. The first noise reduction pipe has a first through hole. The first through hole penetrates both ends of the first noise reduction pipe in its extending direction. The first noise reduction pipe also has a plurality of first noise reduction holes, each penetrating the wall of the first noise reduction pipe. The second noise reduction pipe has a second through hole. The second through hole penetrates both ends of the second noise reduction pipe in its extending direction. The second noise reduction pipe is housed within the first through hole, and the first noise reduction pipe surrounds the second noise reduction pipe. The second noise reduction pipe also has a plurality of second noise reduction holes, each penetrating the wall of the second noise reduction pipe. The first noise reduction cotton is housed within the first through hole and located between the first and second noise reduction pipes. The second noise reduction cotton is housed within the second through hole.

[0006] In some embodiments, the flow-cutting area of ​​the first silencing hole is smaller than that of the second silencing hole.

[0007] In some embodiments, the plurality of first silencing holes are divided into multiple groups, and each group of first silencing holes is located at different positions in the extension direction of the first silencing pipe. In the projection plane of the unfolded pipe wall of the first silencing pipe, the plurality of first silencing holes are arranged in a staggered array, in which rows and columns intersect perpendicularly.

[0008] In some embodiments, the plurality of first silencing holes are divided into multiple groups, and each group of first silencing holes is located at different positions in the extension direction of the first silencing pipe. In the projection plane of the pipe wall after the first silencing pipe is unfolded, the plurality of first silencing holes are arranged in a staggered array, in which rows intersect with columns at an angle.

[0009] In some embodiments, a plurality of the first silencing holes are arranged in a spiral pattern on the wall of the first silencing pipe along the extension direction of the first silencing pipe.

[0010] In some embodiments, a plurality of second silencing holes are arranged in a spiral pattern on the wall of the second silencing pipe along its extension direction.

[0011] In some embodiments, in the extending direction of the second silencer tube, the inner wall of the second through hole includes an adjacent threaded area and a non-threaded area. The threaded area is provided with an internal thread for connection with the exhaust connector of the vacuum generator, and the second silencer hole is disposed in the non-threaded area, at least the non-threaded area is provided with the second silencer cotton.

[0012] In some embodiments, the wall thickness of the first silencer is greater than the wall thickness of the second silencer.

[0013] In some embodiments, the length of the first sound-absorbing cotton is greater than the length of the second sound-absorbing cotton in the extending direction of the first sound-absorbing tube.

[0014] In some embodiments, the length of the first sound-absorbing cotton is greater than the length of the second sound-absorbing tube in the extending direction of the first sound-absorbing tube, so that the first sound-absorbing cotton completely covers the second sound-absorbing tube.

[0015] Secondly, this application also provides a suction device, which includes a vacuum generator and a silencing device as described in any of the above embodiments. The vacuum generator includes a vacuum generating box, an inlet connector, an exhaust connector, and an adjusting connector. The vacuum generating box has a cavity, the inlet connector has an air inlet, the exhaust connector has an exhaust outlet, and the adjusting connector has an adjusting port. The cavity communicates with the air inlet, the exhaust outlet, and the adjusting port, with the air inlet located between the exhaust outlet and the adjusting port. The silencing device is connected to the exhaust connector, and the exhaust outlet communicates with the silencing device.

[0016] In some embodiments, the suction device further includes a first muffler. The first muffler is housed within the exhaust port and connected to the exhaust connector.

[0017] In some embodiments, the vacuum generator is further provided with a pressure relief connector, the pressure relief connector is provided with a pressure relief port, the exhaust port and the pressure relief port are located at opposite ends of the vacuum generator, the pressure relief port is provided at the end of the vacuum generator where the adjustment port is provided, and the suction device is further provided with a second silencer, the second silencer is provided at the pressure relief port and communicates with the cavity.

[0018] In the silencing device and absorption equipment of this application, the second silencing cotton has a large number of interconnected micropores inside. After the airflow enters the second silencing cotton, it will undergo multiple reflections and scatterings in the micropores, and the energy will gradually attenuate, thereby performing the first layer of silencing. The airflow diffuses to the second silencing cotton through multiple second silencing holes. The multiple first silencing holes can disperse the airflow, reduce the airflow speed, and reduce airflow resonance, forming the second layer of silencing. The first silencing cotton is located between the first silencing pipe and the second silencing pipe. After the airflow diffuses to the first silencing cotton, the energy of the airflow is further attenuated and diffused in the first silencing cotton, forming the third layer of silencing. Finally, the airflow diffuses to the multiple first silencing holes through the first silencing cotton. The airflow undergoes multiple reflections and energy attenuation in the first silencing holes, thereby forming the fourth layer of silencing effect.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein: Figure 1 This is a schematic plan view of the suction device according to some embodiments of this application; Figure 2 yes Figure 1 A schematic cross-sectional view of the silencer device of the suction equipment shown; Figure 3 yes Figure 1 The diagram shows a three-dimensional exploded view of the silencer device of the suction equipment. Figure 4 yes Figure 2 A plan view of one embodiment of the silencer tube of the silencer device shown; Figure 5 yes Figure 2 A plan view showing another embodiment of the silencer tube of the silencer device shown.

[0021] Explanation of key component symbols: Suction device 100; Silencing device 10; First silencing pipe 11; First through hole 111; First silencing hole 113; Second silencing pipe 13; Second through hole 131; Second silencing hole 133; Threaded area 135; Non-threaded area 137; First silencing cotton 15; Second silencing cotton 17; Compressor 20; Vacuum generator 30; Vacuum generator box 31; Cavity 311; Inlet connector 33; Air inlet 331; Exhaust connector 35; Exhaust port 351; Adjusting connector 37; Adjusting port 371; Pressure relief port 39; Suction cup 40; First silencer 50; Second silencer 70. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0023] In the description of this application, it should be understood that the terms "center", "length", "upper", "lower", "top", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] Please see Figure 1 The suction device 100 includes a silencer 10 and a vacuum generator 30. The vacuum generator 30 includes a vacuum generating box 31, an inlet connector 33, an exhaust connector 35, and an adjusting connector 37. The vacuum generating box 31 has a cavity 311, the inlet connector 33 has an air inlet 331, the exhaust connector 35 has an exhaust outlet 351, and the adjusting connector 37 has an adjusting port 371. The cavity 311 communicates with the air inlet 331, the exhaust outlet 351, and the adjusting port 371, with the air inlet 331 located between the exhaust outlet 351 and the adjusting port 371. The silencer 10 is connected to the exhaust connector 35, and the exhaust outlet 351 communicates with the silencer 10.

[0028] The suction device 100 is a device that uses a vacuum generator 30 to create a vacuum at the inlet connector 33, thereby adsorbing materials. The suction device 100 enables rapid material grabbing and handling, improving production efficiency and product quality. During the vacuuming process, compressed air generated by the compressor 20 enters the cavity 311 of the vacuum generator box 31 through the regulating port 371 of the regulating connector 37 and flows out through the exhaust port 351 of the exhaust connector 35. The airflow forms a high-speed flow within the cavity 311, creating a low-pressure zone and thus forming a vacuum at the air inlet 331. This vacuum is then adsorbed and grabbed by the suction cup 40 connected to the inlet connector 33. When it is necessary to release the vacuum, the suction device 100 can control the pressure change within the cavity 311 by adjusting the opening degree of the regulating port 371. When the regulating port 371 is opened, the low-pressure zone within the cavity 311 is broken, and the air inlet 331 returns to its normal level, no longer creating a vacuum. The exhaust port 351 is connected to the silencer 10, which is used to reduce the noise generated when the gas passes through the exhaust port 351.

[0029] Please see Figures 1 to 3The silencing device 10 includes a first silencing pipe 11, a second silencing pipe 13, a first silencing cotton 15, and a second silencing cotton 17. The first silencing pipe 11 has a first through hole 111. The first through hole 111 passes through both ends of the first silencing pipe 11 in the Z-direction. The first silencing pipe 11 also has multiple first silencing holes 113, which pass through the wall of the first silencing pipe 11. The second silencing pipe 13 has a second through hole 131. The second through hole 131 passes through both ends of the second silencing pipe 13 in the Z-direction. The second silencing pipe 13 is housed in the first through hole 111, and the first silencing pipe 11 surrounds the second silencing pipe 13. The second silencing pipe 13 also has multiple second silencing holes 133, which pass through the wall of the second silencing pipe 13. The first silencing cotton 15 is housed in the first through hole 111 and is located between the first silencing pipe 11 and the second silencing pipe 13. The second sound-absorbing cotton 17 is housed within the second through hole 131.

[0030] Specifically, the second sound-absorbing cotton 17 is the inner layer structure of the sound-absorbing device 10. The second sound-absorbing cotton 17 is opposite to the exhaust port 351 and located on the gas discharge path. The second sound-absorbing cotton 17 is housed within the second through hole 131. The second sound-absorbing cotton 17 can be a single piece or multiple pieces. In this application, the second sound-absorbing cotton 17 is a cylindrical structure matching the size and shape of the second through hole 131. The second sound-absorbing cotton 17 can be installed in the second through hole 131 by means of adhesion, etc. The second sound-absorbing cotton 17 is usually made of high-density porous materials, such as aluminum foam or polyurethane foam, etc., without limitation. The material used to make the second sound-absorbing cotton 17 has a large number of interconnected micropores, which can absorb and attenuate the energy in the airflow. When the airflow enters the second sound-absorbing cotton 17, the micropores will reflect and scatter the airflow multiple times, causing the energy in the airflow to gradually attenuate, thereby absorbing energy, reducing noise, and also making the airflow more uniform when passing through the second sound-absorbing cotton 17, reducing the concentrated impact of the airflow, and avoiding noise generated by airflow resonance.

[0031] The second silencer pipe 13 is sleeved outside the second silencer cotton 17 and connected to the exhaust connector 35. The second silencer pipe 13 further diffuses and silences the airflow through the second silencer pipe 13 on the pipe wall. For example, the second silencer pipe 13 is made of a lightweight and high-strength metal material, such as aluminum alloy. Aluminum alloy can reduce the weight of the silencer device 10. In other embodiments of this application, the second silencer pipe 13 can be made of other materials. The second through hole 131 penetrates the opposite ends of the second silencer pipe 13 in the extension direction Z, and the second silencer cotton 17 can be accommodated in the second through hole 131. The second silencer pipe 13 is also provided with a plurality of second silencer holes 133. The second silencer holes 133 penetrate the pipe wall of the second silencer pipe 13 and are used to diffuse the airflow from the internal second silencer cotton 17 to enter the first silencer cotton 15. The second silencer holes 133 form a plurality of airflow channels, and the airflow can pass through different second silencer holes 133, thereby dispersing the airflow, reducing the airflow velocity, reducing airflow resonance, and preventing airflow resonance from generating noise.

[0032] The first sound-absorbing cotton 15 is fitted over the second sound-absorbing pipe 13 and located between the first sound-absorbing pipe 11 and the second sound-absorbing pipe 13. The first sound-absorbing cotton 15 is typically made of high-density fiber material, such as glass fiber or polyester fiber. The material used to make the first sound-absorbing cotton 15 has a large number of interconnected micropores, which can absorb and attenuate the energy in the airflow. When the airflow enters the first sound-absorbing cotton 15 through the second sound-absorbing hole 133 of the second sound-absorbing pipe 13, the micropores inside the first sound-absorbing cotton 15 will rub and collide with the airflow multiple times, causing the energy in the airflow to gradually attenuate. Furthermore, the first sound-absorbing cotton 15 can further diffuse the airflow, making it more uniform as it passes through the first sound-absorbing hole 113, reducing the concentrated impact of the airflow. The first silencer pipe 11 is the outer structure of the silencer device 10. The first sound-absorbing cotton 15, the second silencer pipe 13, and the second sound-absorbing cotton 17 are all housed within the first silencer pipe 11. The first silencer pipe 11 is typically made of high-strength metal materials, such as aluminum alloy or stainless steel, giving it good mechanical strength, the ability to withstand airflow impact, and good corrosion resistance and durability. The first silencer pipe 11 has a first through hole 111, which penetrates both ends of the first silencer pipe 11 in the Z-direction. The first sound-absorbing cotton 15 is housed within the first through hole 111. The first silencer pipe 11 also has multiple first silencer holes 113, which penetrate the pipe wall of the first silencer pipe 11. These first silencer holes 113 form multiple airflow channels, allowing airflow to pass through different first silencer holes 113, thereby dispersing the airflow, reducing airflow velocity, minimizing airflow resonance, and preventing noise generation from airflow resonance.

[0033] In the silencing device 10 of this application, the second silencing cotton 17 has a large number of interconnected micropores inside. After the airflow enters the second silencing cotton 17, it will undergo multiple reflections and scatterings in the micropores, and the energy will gradually attenuate, thus performing the first layer of silencing. The airflow diffuses to the second silencing cotton 17 through multiple second silencing holes 133. Multiple first silencing holes 113 can disperse the airflow, reduce the airflow speed, and reduce airflow resonance, thus forming the second layer of silencing. The first silencing cotton 15 is located between the first silencing pipe 11 and the second silencing pipe 13. The airflow diffuses to the first silencing cotton 15 and its energy is further attenuated and diffused in the first silencing cotton 15, forming the third layer of silencing. Finally, the airflow diffuses to the multiple first silencing holes 113 through the first silencing cotton 15. The airflow undergoes multiple reflections and energy attenuation in the first silencing holes 113, thus forming the fourth layer of silencing effect.

[0034] Please see Figure 3 In some embodiments, the flow-cutting area S1 of the first silencing hole 113 is smaller than the flow-cutting area S2 of the second silencing hole 133.

[0035] Specifically, the first silencing hole 113 includes a first end and a second end, with the first end of the first silencing hole 113 being closer to the first silencing cotton 15 than the second end. Gas enters the first silencing hole 113 from the first end and exits to the outside from the second end. The second silencing hole 133 also includes a first end and a second end, with the first end of the second silencing hole 133 being closer to the second silencing cotton 17 than the second end. Gas enters the first silencing hole 113 from the first end and exits to the outside from the second end. The flow-cutting area S1 of the first silencing hole 113 is the area obtained by a cross-section perpendicular to the direction from the first end to the second end of the first silencing hole 113. The flow-cutting area S2 of the second silencing hole 133 is the area obtained by a cross-section perpendicular to the direction from the first end to the second end of the second silencing hole 133.

[0036] The second silencer hole 133 has a large cross-sectional area S2, which allows for better diffusion of the airflow when it passes through the second silencer hole 133, thus rapidly reducing the flow velocity and dispersing the airflow. The first silencer hole 113 has a small cross-sectional area S1, which allows the airflow to undergo more reflections within the first silencer hole 113, resulting in better energy attenuation.

[0037] Please see Figure 4 In some embodiments, the multiple first silencing holes 113 are divided into multiple groups, and each group of first silencing holes 113 is located at different positions in the extension direction Z of the first silencing pipe 11. In the projection plane of the pipe wall of the first silencing pipe 11 after it is unfolded, the multiple first silencing holes 113 are arranged in a cross-shaped array, and in the array, the rows and columns intersect perpendicularly.

[0038] Specifically, in Figure 3 In the arrangement, the multiple first silencer holes 113 are divided into 6 groups, or 6 columns (M1, M2, M3, M4, M5, and M6), with each group including 3 silencer holes. The first silencer holes 113 of different groups form rows (N1, N2, and N3) in the extension direction Z of the first silencer pipe 11, with the rows and columns intersecting perpendicularly. The array arrangement of the rows and columns perpendicularly intersecting ensures that the airflow is evenly dispersed when passing through the first silencer holes 113. After entering the first silencer pipe 11, the airflow is evenly divided into multiple small airflows by the first silencer holes 113. The evenly distributed airflow can reduce the concentrated impact of the airflow, reduce the airflow velocity, thereby reducing airflow resonance and thus reducing the noise generated when the airflow passes through.

[0039] Please see Figure 5 In some embodiments, the multiple first silencing holes 113 are divided into multiple groups, and each group of first silencing holes 113 is located at different positions in the extension direction Z of the first silencing pipe 11. In the projection plane after the pipe wall of the first silencing pipe 11 is unfolded, the multiple first silencing holes 113 are arranged in a cross-shaped array, and in the array, the rows are inclined to intersect the columns.

[0040] Specifically, in Figure 4 In the arrangement, the multiple first silencer holes 113 are divided into 4 groups (M1, M2, M3, and M4), i.e., 4 columns. Each group includes 5 silencer holes. The first silencer holes 113 of different groups are arranged in 5 rows (N1, N2, N3, N4, and N5) at an inclination relative to the extension direction Z of the first silencer pipe 11. The rows and columns intersect perpendicularly. The inclined array ensures that the first silencer holes 113 are evenly distributed on the pipe wall of the first silencer pipe 11, ensuring that the airflow diffuses synchronously within the first silencer pipe 11 and eliminating local high-speed airflow.

[0041] Please see Figure 3 In some embodiments, a plurality of first silencing holes 113 are spirally arranged on the wall of the first silencing pipe 11 along the extending direction Z. In some embodiments, a plurality of second silencing holes 133 are spirally arranged on the wall of the second silencing pipe 13 along the extending direction Z.

[0042] Specifically, when airflow enters the second silencing pipe 13 from the second silencing cotton 17, the spirally arranged silencing holes cause the airflow to move along a spiral path, thereby generating a swirling flow. This swirling flow allows the airflow to diffuse more evenly into the first silencing cotton 15 after passing through the second silencing holes 133, reducing the concentrated impact of the airflow and thus lowering the noise generated by the airflow. Multiple first silencing holes 113 are spirally arranged on the wall of the first silencing pipe 11, enabling the airflow to swirl. This rotation further enhances the airflow diffusion effect. When airflow enters the first silencing pipe 11 from the first silencing cotton 15, the spirally arranged silencing holes cause the airflow to move along a spiral path, thereby generating a swirling flow. This swirling flow allows the airflow to diffuse more evenly to the outside after passing through the first silencing holes 113, reducing the concentrated impact of the airflow and thus lowering the noise generated by the airflow.

[0043] Please see Figure 3 In some embodiments, along the Z-direction of the second silencing tube 13, the inner wall of the second through hole 131 includes a threaded area 135 and a non-threaded area 137. The threaded area 135 is provided with an internal thread for connection with the exhaust connector 35 of the vacuum generator 30. The second silencing hole 133 is located in the non-threaded area 137, and at least the non-threaded area 137 is provided with a second silencing cotton 17.

[0044] Specifically, the threaded area 135 has an internal thread for connecting to the exhaust connector 35 of the vacuum generator 30, thereby fixing the silencer 10 to the exhaust connector 35. The second silencer pipe 13 connects to the exhaust connector 35 using its own structure without the need for additional connectors, saving components and reducing the complexity of the assembly process. In addition, the threaded connection provides good sealing performance, preventing airflow leakage and ensuring the normal operation of the silencer 10. The second sound-absorbing cotton 17 is close to the vacuum generator 30 in the threaded area 135, and at least the non-threaded area 137 is provided with the second sound-absorbing cotton 17, so that the airflow enters quickly after passing through the threaded area 135 and enters the second sound-absorbing cotton 17, shortening the path of the airflow from the exhaust port 351 to the second sound-absorbing cotton 17, thereby quickly passing through the silencer 10 and reducing the noise generated by the airflow.

[0045] Please see Figure 2 In some embodiments, the wall thickness H1 of the first silencer 11 is greater than the wall thickness H2 of the second silencer 13.

[0046] Specifically, the ratio (H2 / H1) of the wall thickness H2 of the second silencer 13 to the wall thickness H1 of the first silencer 11 can be 0.95, 0.91, 0.87, 0.86, 0.81, 0.78, 0.75, 0.7, 0.65, or 0.6, etc. If the wall thickness H1 of the first silencer 11 is less than or equal to the wall thickness H2 of the second silencer 13, the structural strength of the first silencer 11 is insufficient, and the first silencer 11 is prone to deformation. The thicker wall of the first silencer 11 can extend the airflow movement distance within the first silencer hole 113, allowing the airflow to undergo more reflections within the first silencer hole 113, resulting in better energy attenuation and maintaining the structural strength of the entire silencer device 10. The thinner wall of the second silencer 13 can reduce the occupation of radial space, leaving more filling thickness for the second silencer cotton 13 and the first silencer cotton 15.

[0047] Please see Figure 2 In some embodiments, in the extending direction Z of the first silencing tube 11, the length L1 of the first silencing cotton 15 is greater than the length L2 of the second silencing cotton 17.

[0048] Specifically, the thickness ratio (L2 / L1) of the length L2 of the second sound-absorbing cotton 17 and the length L1 of the first sound-absorbing cotton 15 can be 0.95, 0.91, 0.87, 0.86, 0.81, 0.78, 0.75, 0.7, 0.65, or 0.6, etc. If the length L1 of the first sound-absorbing cotton 15 is less than or equal to the length L2 of the second sound-absorbing cotton 17, the airflow diffused from the second sound-absorbing pipe 13 may exceed the coverage area of ​​the first sound-absorbing cotton 15, and the insufficiently treated airflow may generate additional noise in the first sound-absorbing pipe 11, reducing the sound absorption effect.

[0049] When the length L1 of the first sound-absorbing cotton 15 is greater than that of the second sound-absorbing cotton 17, the first sound-absorbing cotton 15 can absorb more energy from the airflow diffused from the second silencer pipe 13, ensuring that the first sound-absorbing cotton 15 covers the range of the diffused airflow and guaranteeing the sound-absorbing effect of the first sound-absorbing cotton 15. The longer length of the first sound-absorbing cotton 15 can provide a larger contact area, allowing the airflow to have more opportunities to contact the first sound-absorbing cotton 15 when passing through it, thereby further attenuating the sound energy in the airflow. In addition, the longer first sound-absorbing cotton 15 can also reduce the direct impact of the airflow in the first silencer pipe 11, reduce airflow resonance, and further improve the sound-absorbing effect.

[0050] Please see Figure 2 In some embodiments, in the extending direction Z of the first silencing tube 11, the length L1 of the first silencing cotton 15 is greater than the length L3 of the second silencing tube 13, so that the first silencing cotton 15 completely wraps the second silencing tube 13.

[0051] Specifically, when the airflow diffuses out from the second silencer hole 133 of the second silencer pipe 13, the first silencer cotton 15 fully wraps around the second silencer pipe 13, ensuring that the airflow makes full contact with the first silencer cotton 15 before entering the first silencer pipe 11. This allows the airflow to be more evenly distributed after passing through the second silencer hole 133, reducing concentrated airflow impact. Evenly distributed airflow effectively reduces airflow velocity and airflow resonance, thereby improving the silencing effect. Please see Figure 1 In some embodiments, the suction device 100 further includes a first muffler 50. The first muffler 50 is housed within an exhaust port 351 and connected to an exhaust connector 35.

[0052] Specifically, the first silencer 50 is housed within the exhaust port 351 and connected to the exhaust connector 35. Before the gas enters the silencer device 10, the first silencer 50 reduces the initial noise generated at the exhaust port 351, reduces airflow turbulence and impact, and provides more stable airflow conditions for the silencer device 10. There may be one or more first silencers 50. Exemplarily, this application includes one first silencer 50. Exemplarily, the first silencer 50 may be a copper silencer. Copper silencers have good thermal conductivity and mechanical strength, effectively absorbing and dispersing heat in the airflow, thereby reducing the airflow temperature and minimizing airflow instability caused by high temperatures. Furthermore, the high density and good acoustic performance of copper silencers enable them to more effectively absorb and attenuate sound waves, further enhancing the noise reduction effect. Thus, the first silencer 50 can reduce the load on the silencer device 10 and extend its lifespan.

[0053] Please see Figure 1 In some embodiments, the vacuum generator 30 is further provided with a pressure relief connector 39, the pressure relief connector 39 is provided with a pressure relief port 391, the exhaust port 351 and the pressure relief port 391 are located at opposite ends of the vacuum generator 30, the pressure relief port 391 is provided at the end of the vacuum generator 30 provided with the adjustment port 371, and the suction device 100 is further provided with a second silencer 70, the second silencer 70 is provided at the pressure relief port 391 and communicates with the cavity 311.

[0054] Specifically, the pressure relief port 391 is used to relieve pressure when the gas flow pressure is too high. When it is necessary to release the vacuum, the adjustment port 371 of the adjustment connector 37 is opened, the low-pressure area in the cavity 311 is broken, and the gas pressure gradually returns to the normal level. At this time, the pressure relief port 391 can quickly discharge the gas in the cavity 311, accelerating the process of releasing the vacuum.

[0055] The second silencer 70 is located at the pressure relief port 391 and communicates with the cavity 311. The second silencer 70 is used to reduce the noise generated by the gas discharged through the pressure relief port 391. Exemplarily, the second silencer 70 is a copper pneumatic silencer. Copper material has excellent acoustic properties, enabling it to more effectively absorb and attenuate sound waves, thereby achieving better noise reduction. Furthermore, copper's high density and good mechanical strength allow it to withstand high airflow impacts, ensuring stable operation of the second silencer 70 under high pressure and high flow conditions. The copper pneumatic silencer also has a long service life and high corrosion resistance, enabling it to adapt to various harsh working environments and ensuring the long-term stable operation of the silencing system.

[0056] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. Furthermore, other implementation methods can be derived from the above embodiments, allowing for structural and logical substitutions and changes without departing from the scope of this disclosure.

[0057] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A noise reduction device, characterized in that, include: The first silencer pipe is provided with a first through hole, which penetrates the opposite ends of the first silencer pipe in the extension direction. The first silencer pipe is also provided with a plurality of first silencer holes, which respectively penetrate the pipe wall of the first silencer pipe. The second silencer tube is provided with a second through hole, which passes through the opposite ends of the second silencer tube in the extension direction. The second silencer tube is housed in the first through hole, and the first silencer tube surrounds the second silencer tube. The second silencer tube is also provided with a plurality of second silencer holes, which respectively pass through the tube wall of the second silencer tube. The first sound-absorbing cotton is housed in the first through hole and located between the first sound-absorbing tube and the second sound-absorbing tube; and The second sound-absorbing cotton is placed inside the second through hole.

2. The silencing device according to claim 1, characterized in that, The flow-cutting area of ​​the first silencing hole is smaller than that of the second silencing hole.

3. The silencing device according to claim 2, characterized in that, The first silencing holes are divided into multiple groups, and each group of first silencing holes is located at a different position in the extension direction of the first silencing tube. In the projection plane of the tube wall after the first silencing tube is unfolded, the multiple first silencing holes are arranged in a crisscross array. In the array, rows and columns intersect perpendicularly; or, In the array, rows intersect at an angle relative to columns.

4. The silencing device according to claim 2, characterized in that, Along the extending direction of the first silencer pipe, a plurality of the first silencer holes are arranged in a spiral pattern on the pipe wall of the first silencer pipe; and / or, Along the extension direction of the second silencer pipe, a plurality of second silencer holes are arranged in a spiral pattern on the pipe wall of the second silencer pipe.

5. The silencing device according to claim 2, characterized in that, In the extending direction of the second silencer tube, the inner wall of the second through hole includes a threaded area and a non-threaded area. The threaded area is provided with an internal thread for connection with the exhaust connector of the vacuum generator. The second silencer hole is located in the non-threaded area, and at least the non-threaded area is provided with the second silencer cotton.

6. The silencing device according to claim 1, characterized in that, The wall thickness of the first silencer is greater than that of the second silencer.

7. The silencing device according to claim 1, characterized in that, In the extending direction of the first silencer: The length of the first sound-absorbing cotton is greater than the length of the second sound-absorbing cotton; and / or, The length of the first sound-absorbing cotton is greater than the length of the second sound-absorbing tube, so that the first sound-absorbing cotton completely covers the second sound-absorbing tube.

8. A suction device, characterized in that, include: A vacuum generator includes a vacuum generating box, an inlet connector, an exhaust connector, and an adjustment connector. The vacuum generating box has a cavity, the inlet connector has an air inlet, the exhaust connector has an exhaust outlet, and the adjustment connector has an adjustment port. The cavity is connected to the air inlet, the exhaust outlet, and the adjustment port, and the air inlet is located between the exhaust outlet and the adjustment port. and The muffler according to any one of claims 1-7, wherein the muffler is connected to the exhaust connector and the exhaust port is in communication with the muffler.

9. The suction device according to claim 8, characterized in that, The suction device also includes: The first muffler is housed within the exhaust port and connected to the exhaust connector.

10. The suction device according to claim 8, characterized in that, The vacuum generator is also equipped with a pressure relief connector, which has a pressure relief port. The exhaust port and the pressure relief port are located at opposite ends of the vacuum generator. The pressure relief port is located at the end of the vacuum generator where the adjustment port is located. The suction device is also equipped with a second silencer, which is located at the pressure relief port and communicates with the cavity.

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