Air inlet silencing assembly and air compressor assembly

Abstract

The utility model relates to an air inlet silencing assembly and an air compressor assembly. The assembly comprises an air inlet box, the air inlet box comprises an air inlet used for air inlet, an air outlet used for air outlet and an air flow channel communicated with the air inlet and the air outlet, the air flow channel is arranged in a bent mode, and the circulation cross section of at least one bent position of the air flow channel is arranged to be a gradually-changed cross section. And at least one part of the air inlet box is arranged at the topmost part of the air inlet silencing assembly. The assembly can effectively save space, noise is reduced, and pressure loss can be reduced at the same time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sound elimination and noise reduction, in particular to an air intake sound elimination assembly and an air compressor assembly. BACKGROUND

[0002] In order to meet the needs of various industries, new low-pressure air compressor and blower product series have been continuously launched in recent years, but the air intake noise problem seriously affects the industrial application experience, therefore, a corresponding air intake sound elimination device needs to be designed to reduce the aerodynamic noise transmitted from the air suction port of the main machine.

[0003] The traditional air intake tank occupies a lot of space of the machine set, and can only have certain noise reduction capacity in the high frequency area. In addition, the air intake pressure loss and noise of the machine set need to be well balanced, for example, the labyrinth type noise reduction channel will cause a large pressure loss, and the straight-through noise reduction channel has poor noise reduction capacity, and the space saving, wide frequency noise reduction and low pressure loss have important influence on the noise performance of the whole machine and the performance of the main machine. SUMMARY

[0004] The present application provides an air intake sound elimination assembly and an air compressor assembly, which can effectively save space and reduce pressure loss while reducing noise.

[0005] An air intake sound elimination assembly, comprising an air intake tank, the air intake tank comprising an air inlet for air intake, an air outlet for air exhaust, and an air flow channel communicating the air inlet and the air outlet, the air flow channel being arranged in a curved manner, the flow passage cross section of at least one curved portion of the air flow channel being arranged in a gradually changing cross section, and at least a part of the air intake tank being arranged at the topmost part of the air intake sound elimination assembly.

[0006] Optionally, the air flow channel is formed with an expansion zone, the flow passage cross section of the air flow channel of the expansion zone being larger than the flow passage cross section of the air flow channel of the air intake side of the expansion zone.

[0007] Optionally, the air intake tank comprises a first tank body and a second tank body in communication, the first tank body being formed with the air inlet, the second tank body being formed with the air outlet, the second tank body being arranged at the topmost part of the air intake sound elimination assembly, the expansion zone being arranged at the communication part of the first tank body and the second tank body, and the air flow channel being further curved at the communication part of the first tank body and the second tank body.

[0008] Optionally, the air inlet box further comprises a connecting plate, the second box body comprises a top plate located at the topmost position and a bottom plate oppositely arranged with the top plate, a space between the top plate and the bottom plate is an air flow channel of the second box body, the bottom plate is provided with the air outlet, the first box body comprises a first side plate and a second side plate oppositely arranged, a space between the first side plate and the second side plate is an air flow channel of the first box body, the first side plate is connected with the top plate, the second side plate is connected with the bottom plate through the connecting plate, the connecting plate is arranged as an arc-shaped plate or an inclined flat plate which is convex to the connection between the top plate and the first side plate, and the air flow channel forms the expansion zone at the connecting plate.

[0009] Optionally, the connecting plate is arranged as an inclined flat plate, and an inclination angle of the connecting plate relative to the second side plate is 30-60 degrees; or

[0010] The connecting plate is arranged as an arc-shaped plate which is convex to the connection between the top plate and the first side plate, one end of the connecting plate connected with the second side plate is a first end, one end of the connecting plate connected with the bottom plate is a second end, and an inclination angle of a line connecting the first end and the second end relative to the second side plate is 30-60 degrees.

[0011] Optionally, the first box body is arranged as a square box body with equal flow cross sections, and a length of the line connecting the first end of the connecting plate connected with the second side plate and the second end of the connecting plate connected with the bottom plate is greater than an equivalent diameter of the flow cross section of the first box body.

[0012] Optionally, an area of the largest flow cross section of the second box body is greater than 2 times of an area of the flow cross section of the first box body.

[0013] Optionally, the air flow channel of the first box body is provided with a perforated plate with eyelets; and / or

[0014] The air flow channel of the first box body is provided with a baffle plate without eyelets, the baffle plate extends from an inner wall of the first box body and leaves a gap between the baffle plate and an opposite inner wall.

[0015] Optionally, the air flow channel further forms a contraction zone, the contraction zone is arranged at an air outlet side of the expansion zone, a flow cross section of the contraction zone gradually decreases along an air outlet direction, an inner surface of the contraction zone is arranged as an arc surface in a concave shape, and a smallest end of the contraction zone is formed as the air outlet, and the air flow channel is further bent at the contraction zone.

[0016] An air compressor assembly, comprising:

[0017] An air compressor, comprising an air inlet end;

[0018] As described in any of the above-mentioned intake muffler assembly, the intake end is located directly below the exhaust port of the intake muffler assembly.

[0019] This application provides an intake muffler assembly and an air compressor assembly, wherein at least a portion of the intake box is located on the top of the intake muffler assembly. This allows for the utilization of the space at the top of the intake muffler assembly, ensuring that this portion of the intake box does not occupy space within the intake muffler assembly or the entire unit, and also allows for a greater extension of the airflow channel, improving the noise reduction capability of the intake muffler assembly. Furthermore, the airflow channel is curved, and at least one bend has a gradually changing cross-section. The gradually changing cross-section prevents excessive airflow impact and effectively reduces pressure loss. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an intake muffler assembly shown in an exemplary embodiment of this application;

[0021] Figure 2 yes Figure 1 The cross-sectional view of the air intake box shown in the figure;

[0022] Figure 3 yes Figure 1 Another cross-sectional view of the air intake box shown in the image;

[0023] Figure 4 This is a noise transmission loss diagram for each frequency band.

[0024] Explanation of reference numerals in the attached figures:

[0025] 10-Intake box; 101-Intake port; 102-Exhaust port; 103-Air flow channel; 104-Expansion zone; 105-Contraction zone; 1050-Inner surface; 11-First box; 12-Second box; 13-Connecting plate; 120-Top plate; 122-Bottom plate; 110-First side plate; 112-Second side plate; 20-Air filter; 30-Pipe connector. Detailed Implementation

[0026] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0027] If the application embodiments involve directional indications or positional relationships (for example, up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between components in a certain posture (as shown in the drawings); if the posture changes, the directional indications or positional relationships will also change accordingly. In addition, the terms "first", "second", etc. in the application embodiments are only used for convenience of description, and cannot be understood as indicating or implying relative importance.

[0028] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic view of an air intake muffling assembly 100 according to an example embodiment of the application. Figure 2 is Figure 1 is a sectional view of the air intake box 10 shown in

[0029] The application provides an air intake muffling assembly 100 (hereinafter referred to as assembly 100), which comprises an air intake box 10, an air filter 20 and a pipe joint 30 connected in sequence. The air intake box 10 is used for noise reduction and muffling, the air filter 20 is used for filtering impurities in the air, and the pipe joint 30 is used for connecting with the air inlet end of an air compressor. In an embodiment, the pipe joint 30 can be provided as a stepped pipe joint, the large end of the pipe joint 30 is connected with the air filter 20, and the small end of the pipe joint 30 is used for connecting with the air inlet end of the air compressor, so as to adapt to air filters 20 and air inlet ends of air compressors of different diameters. The pipe joint 30 can adopt a tapered pipe and a main machine air inlet pipe connected detachably.

[0030] The air intake box 10 comprises an air inlet 101, an air outlet 102 and an air flow channel 103 communicating the air inlet 101 and the air outlet 102. Air enters from the air inlet 101, flows through the air flow channel 103 to the air outlet 102. The shape of the air inlet 101 is not limited, including but not limited to polygonal or circular. The air flow channel 103 is curvedly arranged, so that the airflow can change direction at the curved part of the air flow channel 103. The flow passage cross section of at least one curved part of the air flow channel 103 is provided as a tapered cross section, and at least a part of the air intake box 10 is arranged at the topmost part of the air intake muffling assembly 100. Figure 2 The direction of the arrow in

[0031] According to the above description, at least part of the air intake tank 10 is arranged at the top of the air intake muffling assembly 100, which makes the space at the top of the air intake muffling assembly 100 available, and thus the part of the air intake tank 10 does not occupy the space inside the air intake muffling assembly 100 and the entire unit, and can further lengthen the air flow channel 103 to improve the noise reduction and muffling capacity of the assembly 100. Moreover, the air flow channel 103 is arranged in a curved manner, and the flow cross section of at least one curved portion is arranged in a gradually changing manner, which can effectively reduce the pressure loss caused by the gradually changing flow cross section.

[0032] In one embodiment, the air flow channel 103 is formed with an expansion zone 104, and the flow cross section of the air flow channel 103 at the expansion zone 104 is larger than the flow cross section of the air flow channel 103 at the air intake side of the expansion zone 104. The air intake side of the expansion zone 104 refers to the side of the expansion zone 104 close to the air inlet 101. In this way, the volume at the expansion zone 104 is increased, the flow rate of the air entering the expansion zone 104 is reduced, and thus the noise is low. Here, the "flow cross section" refers to the cross section of the expansion zone 104 and the first tank 11 obtained by using a plane perpendicular to the flow direction.

[0033] In this embodiment, the air intake tank 10 includes a first tank 11 and a second tank 12 connected in communication, the first tank 11 is formed with the air inlet 101, the second tank 12 is formed with the air outlet 102, the second tank 12 is arranged at the top of the air intake muffling assembly 100, the expansion zone 104 is arranged at the communication between the first tank 11 and the second tank 12, and the air flow channel is further curved at the communication between the first tank 11 and the second tank 12. In this way, the flow direction of the air flow changes when passing through the communication between the first tank 11 and the second tank 12, and the flow rate is reduced at the same time, which reduces the noise and reduces the pressure loss.

[0034] In one embodiment, the first tank 11 can be arranged at the side of the air intake muffling assembly 100, such as the leftmost side, the rightmost side, the frontmost side or the rearmost side, and the second tank 12 is connected to the top of the first tank 11. The first tank 11 and the second tank 12 can be arranged as square tanks, but are not limited thereto.

[0035] In one embodiment, as shown in FIG. 1, the air intake muffling assembly 100 includes a first tank 11 and a second tank 12 connected in communication, the first tank 11 is formed with the air inlet 101, the second tank 12 is formed with the air outlet 102, the second tank 12 is arranged at the top of the air intake muffling assembly 100, the expansion zone 104 is arranged at the communication between the first tank 11 and the second tank 12, and the air flow channel is further curved at the communication between the first tank 11 and the second tank 12. Figure 2As shown, the air inlet box 10 further comprises a connecting plate 13, the second box 12 comprises a top plate 120 located at the topmost part and a bottom plate 122 opposite to the top plate 120, the space between the top plate 120 and the bottom plate 122 is the air flow channel 103, and the bottom plate is provided with the air outlet 102. The first box 11 comprises a first side plate 110 and a second side plate 112 oppositely arranged, the space between the first side plate 110 and the second side plate 112 is the air flow channel 103, the first side plate 110 is connected with the top plate 120, and the second side plate 112 is connected with the bottom plate 112 through the connecting plate 13. The connecting plate 13 is arranged as an arc-shaped plate or an inclined flat plate protruding towards the joint of the top plate 120 and the first side plate 110, so as to form a gradually expanding expansion area 104 at the joint of the first box 11 and the second box 12. In this scheme, the arrangement of the connecting plate 13 makes the formation of the expansion area 104 more simple. Moreover, the arc-shaped plate or the inclined flat plate can avoid the formation of a sudden change at the expansion area 104, thereby avoiding a large impact of the air flow at this position and reducing the pressure loss.

[0036] In one embodiment, the connecting plate 13 is arranged as an inclined flat plate, and the inclination angle a of the connecting plate 13 relative to the second side plate 112 is 30-60 degrees. For example, the inclination angle a can be 30°, 35°, 40°, 45°, 50°, 60°, but is not limited thereto. In an alternative embodiment, the inclination angle a is 45°.

[0037] In another embodiment, the connecting plate 13 is arranged as an arc-shaped plate protruding towards the joint of the top plate 120 and the first side plate 110, one end of the connecting plate 13 connected with the second side plate 112 is a first end, and the other end of the connecting plate 13 connected with the bottom plate 122 is a second end. The inclination angle a of the line connecting the first end and the second end relative to the second side plate 112 is 30-60 degrees. For example, the inclination angle a can be 30°, 35°, 40°, 45°, 50°, 60°, but is not limited thereto. In an alternative embodiment, the inclination angle a is 45°.

[0038] In this embodiment, the first side plate 110 is provided with the air inlet 101, which is a square port, but is not limited thereto. The air inlet 101 can be arranged at the bottommost end of the first side plate 110, so that the air flow channel 103 in the first box 11 is all located above the air inlet 101. Of course, the air inlet 101 can be higher than the bottommost end of the first side plate 110, so that part of the air flow channel 103 in the first box 11 is located above the air inlet 101, and the other part of the air flow channel 103 is located below the air inlet 101. In actual application scenarios, the air inlet speed at the air inlet 101 can be set to 5-20 m / s.

[0039] Please refer to Figure 3 , Figure 3 is another sectional view of the air inlet box 10.

[0040] In one embodiment, the first box 11 is set as a square box with equal flow cross sections. The length L of the line connecting the first end where the connecting plate 13 connects with the second side plate 112 and the second end where the connecting plate 13 connects with the bottom plate 122 is greater than the equivalent diameter of the flow cross section of the first box 11, so as to ensure that the air flow can be smoothly transferred into the second box 12. The "equivalent diameter of the flow cross section of the first box 11" refers to the diameter of a circle with an area equal to that of the flow cross section of the first box 11.

[0041] In one embodiment, the area of the flow cross section of the second box 12 is set to be more than twice the area of the largest flow cross section of the first box 11. In this way, the volume of the air flow passage 103 in the second box 12 is large, and the noise reduction effect is better. The second box 12 can be set as a square box with equal flow cross sections, but is not limited to this, and can also be a polygonal box such as a rhombic box.

[0042] In one embodiment, a perforated plate with holes (not shown in the figure) can be fixedly arranged in the air flow passage 103 of the first box 11. The perforated plate can change the acoustic cavity mode and prevent the generation of acoustic cavity resonance in the air flow passage 103.

[0043] In another embodiment, a baffle plate without holes is fixed in the air flow passage 103 of the first box 11. The baffle plate extends from the inner wall of the first box 11 and leaves a gap with the opposite inner wall. The baffle plate is used to change the path of the air flow passage 103, so as to change the acoustic cavity mode and avoid the generation of acoustic cavity resonance.

[0044] In one embodiment, sound-absorbing cotton can be attached to the inner wall of the second box 12. The sound-absorbing cotton can absorb noise and achieve noise reduction.

[0045] Please refer to Figure 2In one embodiment, the airflow channel 103 further includes a contraction zone 105 located on the exhaust side of the expansion zone 104. The flow cross-section of the contraction zone 105 gradually decreases along the exhaust direction. The inner surface 1050 of the contraction zone 105 is configured as an inwardly concave arc surface. The smallest end of the contraction zone 105 forms the exhaust port 102. The airflow channel 103 is also bent at the contraction zone 105. This configuration prevents excessive airflow impact due to abrupt changes and reduces pressure loss. The exhaust side of the expansion zone 104 refers to the side of the expansion zone 104 closest to the exhaust port 102.

[0046] Please refer to Figure 4 , Figure 4 This is a noise transmission loss diagram for each frequency band.

[0047] Depend on Figure 4 As can be seen, the component 100 in this application, by setting the expansion region 104 and the contraction region 105, not only improves the noise reduction in the low-frequency band (300Hz~500Hz) (noise reduction of about 40dB), but also achieves the effect of wide-band (300Hz~2700Hz) noise reduction, while improving the noise reduction across the entire frequency band. This application also provides an air compressor assembly (not shown in the accompanying drawings), which includes an air compressor and the aforementioned intake silencer component 100. The air compressor includes an intake end, and the exhaust port of the intake silencer component 100 is connected to the intake end of the air compressor. The intake end is located directly below the exhaust port 102, which minimizes the bending and distance of the air compressor's intake end.

[0048] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An air intake silencing assembly, comprising: The air intake box comprises an air intake port for air intake, an air exhaust port for air exhaust, and an air flow channel connecting the air intake port and the air exhaust port, the air flow channel is arranged in a curved manner, the flow cross section of at least one curved portion of the air flow channel is arranged in a gradually changing manner, and at least a portion of the air intake box is arranged at the topmost portion of the air intake muffling assembly.

2. The air intake silencing assembly of claim 1, wherein, The air flow channel is formed with an expansion zone, and the flow cross section of the air flow channel of the expansion zone is greater than the flow cross section of the air flow channel on the air intake side of the expansion zone.

3. The air intake silencing assembly of claim 2, wherein, The air intake box comprises a first box body and a second box body connected in communication, the first box body is formed with the air intake port, the second box body is formed with the air exhaust port, the second box body is arranged at the topmost portion of the air intake muffling assembly, the expansion zone is arranged at the communication portion of the first box body and the second box body, and the air flow channel is further curved at the communication portion of the first box body and the second box body.

4. The air intake silencing assembly of claim 3, wherein, The air intake box further comprises a connecting plate, the second box body comprises a top plate at the topmost portion and a bottom plate arranged opposite to the top plate, the space between the top plate and the bottom plate is the air flow channel of the second box body, the bottom plate is provided with the air exhaust port, the first box body comprises a first side plate and a second side plate arranged opposite to each other, the space between the first side plate and the second side plate is the air flow channel of the first box body, the first side plate is connected with the top plate, the second side plate is connected with the bottom plate through the connecting plate, the connecting plate is arranged as an arc-shaped plate or an inclined flat plate which is convex to the connection portion of the top plate and the first side plate, and the air flow channel forms the expansion zone at the connecting plate.

5. The air intake silencing assembly of claim 4, wherein, The connecting plate is arranged as an inclined flat plate, and the inclination angle of the connecting plate relative to the second side plate is 30-60 degrees; or The connecting plate is arranged as an arc-shaped plate which is convex to the connection portion of the top plate and the first side plate, one end of the connecting plate connected with the second side plate is a first end, one end of the connecting plate connected with the bottom plate is a second end, and the inclination angle of the line connecting the first end and the second end relative to the second side plate is 30-60 degrees.

6. The air intake silencing assembly of claim 4, wherein, The first box body is arranged as a square box body with equal flow cross sections, and the length of the line connecting the first end of the connecting plate connected with the second side plate and the second end of the connecting plate connected with the bottom plate is greater than the equivalent diameter of the flow cross section of the first box body.

7. The air intake silencing assembly of claim 6, wherein, The area of the maximum flow cross section of the second box body is greater than 2 times the area of the flow cross section of the first box body.

8. The air intake silencing assembly of any one of claims 3 to 6, wherein, The air flow channel of the first box body is provided with a perforated plate with eyelets; and / or The air flow channel of the first box body is provided with a baffle without eyelets, the baffle extends from the inner wall of the first box body and leaves a gap between the opposite inner wall.

9. The air intake silencing assembly of any one of claims 2 to 6, wherein, The air flow channel is further formed with a contraction zone, the contraction zone is arranged on the air exhaust side of the expansion zone, the flow cross section of the contraction zone gradually decreases along the air exhaust direction, the inner surface of the contraction zone is arranged as an arc surface in a concave manner, the smallest end of the contraction zone is formed as the air exhaust port, and the air flow channel is further curved at the contraction zone.

10. An air compressor assembly characterized by, The air compressor comprises an air intake end; ​ The air intake silencing assembly of any one of claims 1 to 9, the air intake end being positioned directly below an exhaust port of the air intake silencing assembly.

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