Pump body assembly and compressor

Abstract

The pump body assembly comprises a first flange and an air cylinder provided with an inner cavity, an exhaust structure is arranged between the first flange and the air cylinder, a plurality of air outlet holes are formed in the first flange, and the exhaust structure can act under the action of the pressure difference of air inside and outside the inner cavity. Therefore, connection and disconnection between the air outlet hole and the inner cavity are controlled. According to the technical scheme, only the air outlet is formed in the flange, and the exhaust unit is arranged in other structures, so that compared with existing structures such as an exhaust valve seat arranged on the flange, the occupied area is greatly reduced, and the rigidity of the flange can be effectively guaranteed. And based on the advantages of small occupied area of the air outlet holes and low influence on the structural rigidity of the flange, the multiple air outlet holes can be formed in the flange, so that the air displacement is increased, the air exhaust resistance is reduced, the air exhaust efficiency is improved, the power consumption is reduced, and finally the energy efficiency of the compressor where the pump body assembly is located can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a pump body component and a compressor. Background Art

[0002] Rolling rotor compressors typically incorporate an exhaust unit on the flange of the pump assembly for exhaust. Because the exhaust valve seat in the exhaust unit is large and occupies a larger proportion of the flange surface, this reduces flange rigidity. Furthermore, the exhaust unit's outlet area is relatively small, resulting in high exhaust resistance and negatively impacting energy efficiency.

[0003] Therefore, in order to improve the energy efficiency of the rolling rotor compressor, it is necessary to optimize the design of the exhaust unit of the pump assembly. Utility Model Content

[0004] In order to solve the problems that the exhaust unit area of ​​the existing pump body assembly accounts for a large proportion and affects the flange stiffness, and the exhaust unit has a small air outlet area and large exhaust resistance, the utility model proposes a pump body assembly and a compressor.

[0005] In the first aspect, the utility model proposes a pump body assembly, which includes a first flange and a cylinder with an inner cavity, an exhaust structure is arranged between the first flange and the cylinder, and a plurality of air outlet holes are constructed on the first flange. The exhaust structure is constructed to be able to operate under the action of the pressure difference between the internal and external gases of the inner cavity to control the connection and disconnection between the air outlet holes and the inner cavity.

[0006] In one embodiment, the exhaust structure includes a cover plate arranged between the first flange and the cylinder and an exhaust unit arranged on the cover plate, the exhaust unit corresponds to the air outlet, and the exhaust unit is configured to operate under the action of the air pressure difference to control the connection between the air outlet and the inner cavity.

[0007] In one embodiment, the exhaust unit includes an exhaust duct and a slider disposed in the exhaust duct, a first end of the exhaust duct is connected to the inner cavity, and one end of the air outlet is connected to the exhaust duct;

[0008] Among them, the orifice at one end of the air outlet connected to the exhaust duct is located on the moving path of the slider in the exhaust duct, and the slider is constructed to be able to move in the exhaust duct under the action of the pressure difference between the internal and external gases of the inner cavity to block the orifice or stagger with the orifice.

[0009] In one embodiment, an elastic member is provided between the slider and the second end of the exhaust duct, and the sum of the length of the elastic member in a free state and the width of the slider in the axial direction of the exhaust duct is not less than the length of the exhaust duct.

[0010] In one embodiment, the width of the slider in the axial direction and the radial direction of the exhaust passage is greater than the diameter of the orifice, so that the slider can completely block the orifice.

[0011] In one embodiment, the exhaust unit further includes an exhaust hole configured to connect the inner cavity with the first end of the exhaust passage, and a diameter of the exhaust hole is smaller than a radial width of the slider in the exhaust passage.

[0012] In one embodiment, the exhaust hole is configured to extend along the axial direction of the cover plate, the exhaust passage is configured to extend along the radial direction of the cover plate, and the extension direction of the air outlet hole is parallel to the exhaust hole.

[0013] In one embodiment, a groove is constructed on the first surface of the cover plate on the side corresponding to the first flange, and the first flange is configured to close a groove formed by the groove on the first surface to enclose the exhaust duct.

[0014] In one embodiment, a plurality of the exhaust units are constructed on the cover plate, and the plurality of the exhaust units correspond one-to-one to the plurality of the air outlet holes.

[0015] In one embodiment, a silencer structure corresponding to the air outlet is provided on the surface of the first flange, and an outlet flow channel connected to the air outlet is constructed inside the silencer structure. The outlet flow channel includes a diffuser portion and a contraction portion distributed along its flow path, and the inner diameter of the diffuser portion is larger than that of the contraction portion.

[0016] In one embodiment, the silencer structure includes a plurality of silencer sleeves nested in sequence, one end of the innermost central sleeve among the plurality of silencer sleeves is connected to the air outlet and the other end is closed, and each of the silencer sleeves is provided with a vent hole;

[0017] Among them, the multiple air holes on the silencer sleeve are connected to each other to form the outlet air duct extending radially along the silencer sleeve, and there are at least two air holes with different apertures among the multiple air holes constituting the outlet air duct, and the contraction part is constructed at the air hole with smaller aperture, and the diffusion part is constructed at the air hole with larger aperture.

[0018] In one embodiment, each of the silencer sleeves is provided with a plurality of the vent holes, and the plurality of the vent holes on the same silencer sleeve are evenly distributed in the axial direction and the circumferential direction, so as to form a plurality of the outlet flow channels.

[0019] In one embodiment, the outermost surface sleeve among the multiple silencer sleeves is constructed as a structure with one end open and the other end closed, and the surface sleeve covers the other silencer sleeves inside it, so that one end of the other silencer sleeves including the central sleeve is closed.

[0020] In a second aspect, the present invention proposes a compressor, which includes the above-mentioned pump body assembly and thus has all the technical effects it possesses.

[0021] The above technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0022] The pump assembly and compressor provided by the present invention have at least the following beneficial effects compared with the prior art:

[0023] The pump assembly and compressor of this utility model only have an air outlet on the flange, while the exhaust unit is installed in other structures. Compared with existing structures such as exhaust valve seats installed on the flange, the occupied area is greatly reduced, which can effectively ensure the rigidity of the flange. Moreover, due to the advantages of the air outlet occupying a small area and having a low impact on the rigidity of the flange structure, multiple air outlets can be provided on the flange, thereby increasing the exhaust volume and reducing the exhaust resistance, thereby improving the exhaust efficiency and reducing power consumption, and ultimately effectively improving the energy efficiency of the compressor in which the pump assembly is located. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0025] Figure 1 Shows the overall structural diagram of the pump assembly of the utility model;

[0026] Figure 2 Shows Figure 1 A partial enlarged view of point A in the middle;

[0027] Figure 3 A schematic diagram showing the groove body on the surface of the cover plate in the pump body assembly of the present invention;

[0028] Figure 4 Shows Figure 3 The schematic diagram of the tank body after the slider and the elastic member are arranged;

[0029] Figure 5 A schematic diagram showing the air outlet on the surface of the first flange in the pump body assembly of the present invention;

[0030] Figure 6 A top view showing the muffler structure in the pump assembly of the present invention;

[0031] Figure 7 Shows Figure 6 Schematic diagram of the mid-BB cross section.

[0032] In the drawings, like reference numerals are used for like parts, but the drawings are not necessarily true to scale.

[0033] Reference numerals:

[0034] 1-first flange, 11-air outlet, 2-cover plate, 3-cylinder, 31-inner cavity, 4-exhaust unit, 41-exhaust duct, 42-slider, 43-elastic member, 44-exhaust hole, 5-silencer structure, 51-outlet flow duct, 52-silencer sleeve, 521-center sleeve, 522-surface sleeve, 53-vent. DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] Example 1

[0037] An embodiment of the present utility model provides a pump body assembly, which includes a first flange 1 and a cylinder 3 with an inner cavity 31. An exhaust structure is arranged between the first flange 1 and the cylinder 3. A plurality of air outlet holes 11 are constructed on the first flange 1. The exhaust structure is configured to be able to operate under the action of the pressure difference between the internal and external gases of the inner cavity 31 to control the connection and disconnection between the air outlet holes 11 and the inner cavity 31.

[0038] The exhaust structure includes a cover plate 2 arranged between the first flange 1 and the cylinder 3 and an exhaust unit 4 arranged on the cover plate 2. The exhaust unit 4 corresponds to the air outlet 11. The exhaust unit 4 is constructed to operate under the action of the air pressure difference to control the connection between the air outlet 11 and the inner cavity 31.

[0039] Specifically, the overall structure of the pump assembly of the present invention is shown in the accompanying drawings. Figure 1 As shown, its main structure is basically the same as that of the existing pump body assembly. For this part of the structure that is the same as that of the existing pump body assembly, the present invention will not repeat it in detail. The main utility model first relates to the exhaust unit 4 of the pump body assembly, and the exhaust unit 4 is designed to solve the problem of exhaust.

[0040] Refer to the attached figure Figure 1 and Figure 2The present invention first adds a cover plate 2 to the pump assembly. The cover plate 2 is positioned between the first flange 1 and the cylinder 3 of the pump assembly. In this embodiment, the first flange 1 is the upper flange of the pump assembly, but it can also be the lower flange of the pump assembly as needed. The first flange 1 is provided with only the corresponding air outlet 11, while the exhaust unit 4 is primarily located within the cover plate 2, eliminating the exhaust valve seat and other structures originally present on the flange. This significantly simplifies the need for additional structures or configurations on the first flange 1. The exhaust unit 4, located within the cover plate 2, automatically controls the connection between the air outlet 11 and the inner cavity 31 of the cylinder 3 based on the internal and external pressure differential. Furthermore, the exhaust unit 4 is sandwiched between the first flange 1 and the cylinder 3. The first flange 1 and the cylinder 3 help ensure the stability and sealing of the exhaust unit 4, thereby simplifying the structure of the exhaust unit 4 itself and reducing its space occupation, thereby minimizing the impact of the clearance volume on the energy efficiency of the compressor in which the pump assembly is located.

[0041] The utility model is provided with an air outlet 11 (as shown in the accompanying drawings) on the first flange 1. Figure 2 and Figure 5 Compared to existing exhaust valve seats and other structures installed on flanges, the area occupied by the exhaust valve seat is significantly reduced, effectively ensuring the flange's rigidity. Furthermore, due to the advantages of the exhaust holes 11 occupying a small area on the flange and having a minimal impact on the flange's structural rigidity, multiple exhaust holes 11 can be provided on the first flange 1, thereby increasing the exhaust volume and reducing exhaust resistance, thereby improving exhaust efficiency and reducing power consumption, ultimately effectively improving the energy efficiency of the compressor in which the pump assembly is located.

[0042] Furthermore, the exhaust unit 4 includes an exhaust duct 41 and a slider 42 arranged in the exhaust duct 41, the first end of the exhaust duct 41 is connected to the inner cavity 31, and one end of the air outlet 11 is connected to the exhaust duct 41; wherein, the orifice of the end of the air outlet 11 connected to the exhaust duct 41 is located on the moving path of the slider 42 in the exhaust duct 41, and the slider 42 is constructed to be able to move in the exhaust duct 41 under the action of the gas pressure difference between the inside and outside of the inner cavity 31 to block the orifice or stagger with the orifice.

[0043] Specifically, as shown in the accompanying drawings Figure 1 and Figure 2As shown, the exhaust unit 4 is mainly composed of an exhaust duct 41 and a slider 42. The first end of the exhaust duct 41 is connected to the inner cavity 31 of the cylinder 3, and one end of the air outlet 11 is connected to the circumferential inner wall of the exhaust duct 41. That is, the opening where one end of the air outlet 11 connects to the exhaust duct 41 is located on the movement path of the slider 42 in the exhaust duct 41. Under the action of the gas pressure difference between the inside and outside of the inner cavity 31, the slider 42 will move along the exhaust duct 41. When the gas pressure in the inner cavity 31 is greater than the external gas pressure, the slider 42 moves away from the first end of the exhaust duct 41 and closer to the second end of the exhaust duct 41. At the same time, during the movement, the slider 42 is staggered with the opening of the air outlet 11, so that the inner cavity 31, the exhaust duct 41 and the air outlet 11 are connected, and the cylinder 3 can be exhausted. When the exhaust is completed, the air pressure in the inner cavity 31 of the cylinder 3 is lower than the external air pressure, and the slider 42 moves toward the first end of the exhaust duct 41 and away from the second end of the exhaust duct 41 and moves to correspond to the opening of the air outlet hole 11, thereby blocking the opening of the air outlet hole 11.

[0044] Among them, the opening at one end of the air outlet hole 11 connected to the exhaust duct 41 is close to the first end of the exhaust duct 41. In this way, when the slider 42 moves toward the first end of the exhaust duct 41 and away from the second end of the exhaust duct 41, the slider 42 finally abuts against the first end of the exhaust duct 41 and remains stationary. At this time, the slider 42 is facing the opening of the air outlet hole 11, which can ensure the reliability of blocking the opening of the air outlet hole 11.

[0045] Preferably, an elastic member 43 is provided between the slider 42 and the second end of the exhaust passage 41 , and the sum of the length of the elastic member 43 in a free state and the axial width of the slider 42 in the exhaust passage 41 is not less than the length of the exhaust passage 41 .

[0046] Specifically, as shown in the accompanying drawings Figure 1 and Figure 2 As shown, the elastic member 43 is arranged between the slider 42 and the second end of the exhaust channel 41, and is preferably in a compressed state, so that when the slider 42 moves toward the second end, the elastic member 43 is further compressed, thereby providing power for the reverse reset of the slider 42.

[0047] Preferably, the width of the slider 42 in the axial and radial directions of the exhaust passage 41 is greater than the diameter of the vent, so that the slider 42 can completely block the vent.

[0048] Furthermore, the exhaust unit 4 further includes an exhaust hole 44 , which is configured to connect the inner cavity 31 with the first end of the exhaust passage 41 . The diameter of the exhaust hole 44 is smaller than the radial width of the slider 42 in the exhaust passage 41 .

[0049] Specifically, as shown in the accompanying drawings Figure 2As shown, the exhaust unit 4 further includes an exhaust hole 44 connected to the first end of the exhaust duct 41. The aperture of the exhaust hole 44 (specifically, the aperture in the width direction of the exhaust duct 41) is smaller than the width of the exhaust duct 41. Figure 3 As shown, when the slider 42 abuts the first end of the exhaust duct 41, the slider 42 cannot further enter the exhaust hole 44, and thus there is a space between the end face of the slider 42 and the exhaust hole 44. In this way, the pressure of the gas flowing from the exhaust hole 44 to the exhaust duct 41 can effectively act on the end face of the slider 42, thereby effectively pushing the slider 42 to move.

[0050] Furthermore, the exhaust hole 44 is configured to extend along the axial direction of the cover plate 2 , the exhaust passage 41 is configured to extend along the radial direction of the cover plate 2 , and the extension direction of the air outlet 11 is parallel to the exhaust hole 44 .

[0051] Specifically, the exhaust hole 44 and the outlet hole 11 extend axially along the pump body structure on the cover plate 2 and the first flange 1, respectively. This minimizes the length of the exhaust hole 44 and the outlet hole 11, reduces the space they occupy within the cover plate 2 and the first flange 1, and further reduces their impact on the structural rigidity of the cover plate 2 and the first flange 1. The exhaust duct 41 is configured to extend radially along the cover plate 2, which provides sufficient space for the construction of the exhaust duct 41.

[0052] Optionally, a groove is constructed on the first surface of the cover plate 2 on the side corresponding to the first flange 1 , and the first flange 1 is configured to close the groove formed on the first surface of the groove to enclose the exhaust duct 41 .

[0053] Specifically, as shown in the accompanying drawings Figure 3 and Figure 4 As shown, the exhaust duct is based on the groove body on the surface of the cover plate. Combined with the notch of the groove body closed by the first flange in the assembled state, the groove body can be enclosed to form the exhaust duct. This structural design allows the exhaust duct to be directly processed on the surface of the cover plate, improving the convenience of processing and subsequent assembly. Of course, if needed, the exhaust duct can also be completely set inside the cover plate.

[0054] Preferably, a plurality of exhaust units 4 are constructed on the cover plate 2 , and the plurality of exhaust units 4 correspond one-to-one to the plurality of air outlet holes 11 , thereby achieving independent exhaust of the plurality of air outlet holes 11 .

[0055] Example 2

[0056] An embodiment of the present utility model provides a pump body assembly, which includes a first flange 1 and a cylinder 3 with an inner cavity 31. A cover plate 2 is arranged between the first flange 1 and the cylinder 3. A plurality of air outlet holes 11 are constructed on the first flange 1. An exhaust unit 4 is constructed on the cover plate 2. The exhaust unit 4 is configured to be able to operate under the action of the gas pressure difference between the inside and outside of the inner cavity 31 to control the connection and disconnection between the air outlet holes 11 and the inner cavity 31.

[0057] The exhaust structure includes a cover plate 2 arranged between the first flange 1 and the cylinder 3 and an exhaust unit 4 arranged on the cover plate 2. The exhaust unit 4 corresponds to the air outlet 11. The exhaust unit 4 is constructed to operate under the action of the air pressure difference to control the connection between the air outlet 11 and the inner cavity 31.

[0058] Specifically, the overall structure of the pump assembly of the present invention is shown in the accompanying drawings. Figure 1 As shown, its main structure is basically the same as that of the existing pump body assembly. For this part of the structure that is the same as that of the existing pump body assembly, the present invention will not repeat it in detail. The main utility model first relates to the exhaust unit 4 of the pump body assembly, and the exhaust unit 4 is designed to solve the problem of exhaust.

[0059] Refer to the attached figure Figure 1 and Figure 2 The present invention first adds a cover plate 2 to the pump assembly. The cover plate 2 is positioned between the first flange 1 and the cylinder 3 of the pump assembly. In this embodiment, the first flange 1 is the upper flange of the pump assembly, but it can also be the lower flange of the pump assembly as needed. The first flange 1 is provided with only the corresponding air outlet 11, while the exhaust unit 4 is primarily located within the cover plate 2, eliminating the exhaust valve seat and other structures originally present on the flange. This significantly simplifies the need for additional structures or configurations on the first flange 1. The exhaust unit 4, located within the cover plate 2, automatically controls the connection between the air outlet 11 and the inner cavity 31 of the cylinder 3 based on the internal and external pressure differential. Furthermore, the exhaust unit 4 is sandwiched between the first flange 1 and the cylinder 3. The first flange 1 and the cylinder 3 help ensure the stability and sealing of the exhaust unit 4, thereby simplifying the structure of the exhaust unit 4 itself and reducing its space occupation, thereby minimizing the impact of the clearance volume on the energy efficiency of the compressor in which the pump assembly is located.

[0060] The utility model is provided with an air outlet 11 (as shown in the accompanying drawings) on the first flange 1. Figure 2 and Figure 5 Compared to existing exhaust valve seats and other structures installed on flanges, the area occupied by the exhaust valve seat is significantly reduced, effectively ensuring the flange's rigidity. Furthermore, due to the advantages of the exhaust holes 11 occupying a small area on the flange and having a minimal impact on the flange's structural rigidity, multiple exhaust holes 11 can be provided on the first flange 1, thereby increasing the exhaust volume and reducing exhaust resistance, thereby improving exhaust efficiency and reducing power consumption, ultimately effectively improving the energy efficiency of the compressor in which the pump assembly is located.

[0061] Furthermore, the exhaust unit 4 includes an exhaust duct 41 and a slider 42 arranged in the exhaust duct 41, the first end of the exhaust duct 41 is connected to the inner cavity 31, and one end of the air outlet 11 is connected to the exhaust duct 41; wherein, the orifice of the end of the air outlet 11 connected to the exhaust duct 41 is located on the moving path of the slider 42 in the exhaust duct 41, and the slider 42 is constructed to be able to move in the exhaust duct 41 under the action of the gas pressure difference between the inside and outside of the inner cavity 31 to block the orifice or stagger with the orifice.

[0062] Specifically, as shown in the accompanying drawings Figure 1 and Figure 2 As shown, the exhaust unit 4 is mainly composed of an exhaust duct 41 and a slider 42. The first end of the exhaust duct 41 is connected to the inner cavity 31 of the cylinder 3, and one end of the air outlet 11 is connected to the circumferential inner wall of the exhaust duct 41. That is, the opening where one end of the air outlet 11 connects to the exhaust duct 41 is located on the movement path of the slider 42 in the exhaust duct 41. Under the action of the gas pressure difference between the inside and outside of the inner cavity 31, the slider 42 will move along the exhaust duct 41. When the gas pressure in the inner cavity 31 is greater than the external gas pressure, the slider 42 moves away from the first end of the exhaust duct 41 and closer to the second end of the exhaust duct 41. At the same time, during the movement, the slider 42 is staggered with the opening of the air outlet 11, so that the inner cavity 31, the exhaust duct 41 and the air outlet 11 are connected, and the cylinder 3 can be exhausted. When the exhaust is completed, the air pressure in the inner cavity 31 of the cylinder 3 is lower than the external air pressure, and the slider 42 moves toward the first end of the exhaust duct 41 and away from the second end of the exhaust duct 41 and moves to correspond to the opening of the air outlet hole 11, thereby blocking the opening of the air outlet hole 11.

[0063] Among them, the opening at one end of the air outlet hole 11 connected to the exhaust duct 41 is close to the first end of the exhaust duct 41. In this way, when the slider 42 moves toward the first end of the exhaust duct 41 and away from the second end of the exhaust duct 41, the slider 42 finally abuts against the first end of the exhaust duct 41 and remains stationary. At this time, the slider 42 is facing the opening of the air outlet hole 11, which can ensure the reliability of blocking the opening of the air outlet hole 11.

[0064] Preferably, an elastic member 43 is provided between the slider 42 and the second end of the exhaust passage 41 , and the sum of the length of the elastic member 43 in a free state and the axial width of the slider 42 in the exhaust passage 41 is not less than the length of the exhaust passage 41 .

[0065] Specifically, as shown in the accompanying drawings Figure 1 and Figure 2 As shown, the elastic member 43 is arranged between the slider 42 and the second end of the exhaust channel 41, and is preferably in a compressed state, so that when the slider 42 moves toward the second end, the elastic member 43 is further compressed, thereby providing power for the reverse reset of the slider 42.

[0066] Preferably, the width of the slider 42 in the axial and radial directions of the exhaust passage 41 is greater than the diameter of the vent, so that the slider 42 can completely block the vent.

[0067] Furthermore, the exhaust unit 4 further includes an exhaust hole 44 , which is configured to connect the inner cavity 31 with the first end of the exhaust passage 41 . The diameter of the exhaust hole 44 is smaller than the radial width of the slider 42 in the exhaust passage 41 .

[0068] Specifically, as shown in the accompanying drawings Figure 2 As shown, the exhaust unit 4 further includes an exhaust hole 44 connected to the first end of the exhaust duct 41. The aperture of the exhaust hole 44 (specifically, the aperture in the width direction of the exhaust duct 41) is smaller than the width of the exhaust duct 41. Figure 3 As shown, when the slider 42 abuts the first end of the exhaust duct 41, the slider 42 cannot further enter the exhaust hole 44, and thus there is a space between the end face of the slider 42 and the exhaust hole 44. In this way, the pressure of the gas flowing from the exhaust hole 44 to the exhaust duct 41 can effectively act on the end face of the slider 42, thereby effectively pushing the slider 42 to move.

[0069] Furthermore, the exhaust hole 44 is configured to extend along the axial direction of the cover plate 2 , the exhaust passage 41 is configured to extend along the radial direction of the cover plate 2 , and the extension direction of the air outlet 11 is parallel to the exhaust hole 44 .

[0070] Specifically, the exhaust hole 44 and the outlet hole 11 extend axially along the pump body structure on the cover plate 2 and the first flange 1, respectively. This minimizes the length of the exhaust hole 44 and the outlet hole 11, reduces the space they occupy within the cover plate 2 and the first flange 1, and further reduces their impact on the structural rigidity of the cover plate 2 and the first flange 1. The exhaust duct 41 is configured to extend radially along the cover plate 2, which provides sufficient space for the construction of the exhaust duct 41.

[0071] Optionally, a groove is constructed on the first surface of the cover plate 2 on the side corresponding to the first flange 1 , and the first flange 1 is configured to close the groove formed on the first surface of the groove to enclose the exhaust duct 41 .

[0072] Specifically, as shown in the accompanying drawings Figure 3 and Figure 4 As shown, the exhaust duct is based on the groove body on the surface of the cover plate. Combined with the notch of the groove body closed by the first flange in the assembled state, the groove body can be enclosed to form the exhaust duct. This structural design allows the exhaust duct to be directly processed on the surface of the cover plate, improving the convenience of processing and subsequent assembly. Of course, if needed, the exhaust duct can also be completely set inside the cover plate.

[0073] Preferably, a plurality of exhaust units 4 are constructed on the cover plate 2 , and the plurality of exhaust units 4 correspond one-to-one to the plurality of air outlet holes 11 , thereby achieving independent exhaust of the plurality of air outlet holes 11 .

[0074] Furthermore, a silencer structure 5 corresponding to the air outlet 11 is provided on the surface of the first flange 1, and an outlet flow channel 51 connected to the air outlet 11 is constructed inside the silencer structure 5. The outlet flow channel 51 includes a diffuser portion and a contraction portion distributed along its flow path, and the inner diameter of the diffuser portion is larger than that of the contraction portion.

[0075] Specifically, a silencer structure 5 is provided on the surface of the first flange 1 corresponding to each air outlet 11. The silencer structure 5 can be fixed to the first flange 1 by means of snaps, pins, bolts, gluing, welding, etc. An outlet flow channel 51 is provided inside the silencer structure 5. The gas discharged from the air outlet 11 needs to flow through the outlet flow channel 51 before it can be discharged. During this process, when the gas flows in the outlet flow channel 51, due to the change in the radial dimensions of the diffuser and the contraction part of the outlet flow channel 51, the gas can diffuse in the diffuser with a larger space, thereby reducing the local flow velocity and dispersing the local flow direction, thereby achieving silencer and noise reduction by changing the air flow conditions.

[0076] Furthermore, the silencer structure 5 includes a plurality of silencer sleeves 52 nested in sequence, and one end of the innermost center sleeve 521 among the plurality of silencer sleeves 52 is connected to the air outlet 11, and the other end is closed (including a structure in which the center sleeve 521 itself is closed at one end; also including a structure in which the center sleeve 521 itself is open at both ends, but one end is closed by other components), and each silencer sleeve 52 is respectively provided with an air vent 53; wherein, the air vents 53 on the plurality of silencer sleeves 52 are correspondingly connected to each other to form an outlet flow channel 51 extending radially along the silencer sleeve 52, and at least two of the plurality of air vents 53 constituting the outlet flow channel 51 have different apertures, and the contraction portion is constructed on the air vent 53 with a smaller aperture, and the diffusion portion is constructed on the air vent 53 with a larger aperture.

[0077] Specifically, as shown in the accompanying drawings Figure 6 and Figure 7 As shown, the silencer structure 5 is composed of a plurality of silencer sleeves 52 nested in sequence. The silencer sleeves 52 are provided with vent holes 53. The apertures of the vent holes 53 of different silencer sleeves 52 are not completely consistent. The vent holes 53 of radially different silencer sleeves 52 are correspondingly connected to each other, forming an outlet flow channel 51 having a diffuser portion and a contraction portion. In addition, the outlet flow channel 51 is composed of a plurality of vent holes 53. When the gas flows in the outlet flow channel 51, it interacts with the porous structure of the outlet flow channel 51. This includes the airflow diffusing in the vent holes 53 corresponding to the diffuser portion, changing the flow direction, causing the noise waves to collide and interfere with each other, consuming the sound wave energy; and the gas noise sound waves generated by the airflow between the small holes resonate, further consuming the sound wave energy, ultimately achieving the purpose of silencing and reducing noise.

[0078] In addition, in order to eliminate noise of different frequencies, the size of the vents and the number of silencer sleeves can be changed to obtain a silencer structure for a specific frequency band.

[0079] Furthermore, each silencer sleeve 52 is provided with a plurality of vent holes, and the plurality of vent holes on the same silencer sleeve 52 are evenly distributed in the axial and circumferential directions to form a plurality of outlet air channels 51. The plurality of outlet air channels 51 further increase the outlet area and reduce the outlet resistance.

[0080] Furthermore, the outermost surface sleeve 522 among the multiple silencer sleeves 52 is constructed as a structure with one end open and the other end closed. The surface sleeve 522 covers the other silencer sleeves 52 inside it, so that one end of the other silencer sleeves 52 including the center sleeve 521 is closed (the other silencer sleeves 52 inside the surface sleeve 52 can be open at both ends, or open at one end and closed at the other end).

[0081] Example 3

[0082] An embodiment of the present utility model provides a compressor, which includes the pump body assembly of the above embodiment and thus has all the technical effects possessed by it.

[0083] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0084] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. A pump assembly, characterized in that: The invention comprises a first flange and a cylinder having an inner cavity, an exhaust structure being provided between the first flange and the cylinder, a plurality of air outlet holes being configured on the first flange, and the exhaust structure being configured to be able to operate under the action of the pressure difference between the inner and outer gases of the inner cavity to control the connection and disconnection between the air outlet holes and the inner cavity; Among them, the exhaust structure includes a cover plate arranged between the first flange and the cylinder and an exhaust unit arranged on the cover plate, the exhaust unit corresponds to the air outlet, and the exhaust unit is constructed to operate under the action of air pressure difference to control the connection between the air outlet and the inner cavity.

2. The pump assembly according to claim 1, characterized in that The exhaust unit includes an exhaust duct and a slider disposed in the exhaust duct, wherein a first end of the exhaust duct is connected to the inner cavity, and one end of the air outlet is connected to the exhaust duct; Among them, the orifice at one end of the air outlet connected to the exhaust duct is located on the moving path of the slider in the exhaust duct, and the slider is constructed to be able to move in the exhaust duct under the action of the pressure difference between the internal and external gases of the inner cavity to block the orifice or stagger with the orifice.

3. The pump assembly according to claim 2, characterized in that: An elastic member is provided between the slider and the second end of the exhaust passage, and the sum of the length of the elastic member in a free state and the width of the slider in the axial direction of the exhaust passage is not less than the length of the exhaust passage.

4. The pump assembly according to claim 2, characterized in that The width of the slider in the axial direction and the radial direction of the exhaust passage is greater than the diameter of the orifice, so that the slider can completely block the orifice.

5. The pump assembly according to claim 2, characterized in that: The exhaust unit further includes an exhaust hole configured to connect the inner cavity with the first end of the exhaust passage. A diameter of the exhaust hole is smaller than a radial width of the slider in the exhaust passage.

6. The pump assembly according to claim 5, characterized in that The exhaust hole is configured to extend along the axial direction of the cover plate, the exhaust passage is configured to extend along the radial direction of the cover plate, and the extension direction of the air outlet hole is parallel to the exhaust hole.

7. The pump assembly according to any one of claims 2 to 6, characterized in that: A groove body is constructed on the first surface of the cover plate on the side corresponding to the first flange, and the first flange is configured to close a groove formed by the groove body on the first surface to enclose the exhaust duct.

8. The pump assembly according to any one of claims 1 to 6, characterized in that: A plurality of exhaust units are constructed on the cover plate, and the plurality of exhaust units correspond to the plurality of air outlet holes in a one-to-one manner.

9. The pump assembly according to claim 1, wherein: A silencer structure corresponding to the air outlet is provided on the surface of the first flange, and an outlet flow channel connected to the air outlet is constructed inside the silencer structure. The outlet flow channel includes a diffuser portion and a contraction portion distributed along its flow path, and the inner diameter of the diffuser portion is larger than that of the contraction portion.

10. The pump assembly according to claim 9, characterized in that The muffler structure includes a plurality of muffler sleeves nested in sequence, one end of the innermost central sleeve among the plurality of muffler sleeves is connected to the air outlet and the other end is closed, and each of the muffler sleeves is provided with a vent hole; Among them, the multiple air holes on the silencer sleeve are connected to each other to form the outlet air duct extending radially along the silencer sleeve, and there are at least two air holes with different apertures among the multiple air holes constituting the outlet air duct, and the contraction part is constructed at the air hole with smaller aperture, and the diffusion part is constructed at the air hole with larger aperture.

11. The pump assembly according to claim 10, characterized in that Each of the silencer sleeves is provided with a plurality of vent holes, and the plurality of vent holes on the same silencer sleeve are evenly distributed in the axial direction and the circumferential direction, so as to form a plurality of outlet air passages.

12. The pump assembly according to claim 10, wherein: The outermost surface sleeve among the multiple silencer sleeves is constructed with one end open and the other end closed. The surface sleeve covers the other silencer sleeves inside it, so that one end of the other silencer sleeves including the central sleeve is closed.

13. A compressor, characterized in that: The pump assembly comprises the pump body assembly according to any one of claims 1 to 12.

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