Pump assembly, compressor and refrigeration device

Abstract

The application provides a pump assembly, a compressor and a refrigeration device. The pump assembly comprises a body and a mounting portion. The body is provided with a containing hole which penetrates the body along the axial direction of the pump assembly. The body has a first surface and a second surface. The mounting portion is connected with the body and is located on the side of the body in the radial direction of the body. The mounting portion is provided with a mounting groove and a first hole. The mounting groove extends to the body along the radial direction of the body and is in communication with the first end of the containing hole. The first hole penetrates the mounting portion along the axial direction of the pump assembly and is in communication with the second end of the mounting groove. The first hole comprises a first hole section and a second hole section. The first hole section is closer to the first surface than the second hole section. In the radial direction of the body, the point farthest from the axis of the body on the side wall of the side of the mounting portion away from the body is a first point. The minimum distance between the inner wall of the first hole section and the first point is a first distance. The minimum distance between the inner wall of the second hole section and the first point is a second distance. The first distance is not equal to the second distance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration equipment, in particular to a pump assembly, a compressor and a refrigeration equipment. BACKGROUND

[0002] At present, in the related art, in order to realize high energy efficiency of the compressor, a crankshaft is usually used in the pump assembly of the compressor. In order to make the air gap between the stator and the rotor small and stable, the diameter of the main shaft part of the crankshaft is usually large. The diameter of the auxiliary shaft part of the crankshaft is usually small, so that the friction torque is small. Therefore, there is a diameter difference between the main shaft and the auxiliary shaft of the crankshaft. When the crankshaft is deformed due to the gas force, the deformation amount of the main shaft is smaller than that of the auxiliary shaft, so that the eccentric shaft between the main shaft and the auxiliary shaft is inclined, thereby driving the piston sleeved on the eccentric shaft to be inclined, so that the linear contact between the vane and the piston changes to point contact, and then a gap is formed between the vane and the piston. The refrigerant in the exhaust cavity of the pump assembly can flow back to the suction cavity through the gap, causing leakage of the refrigerant, and reducing the efficiency of the compressor pump assembly. SUMMARY

[0003] The present application aims to at least solve one of the problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present application provides a pump assembly.

[0005] A second aspect of the present application provides a pump assembly.

[0006] A third aspect of the present application provides a compressor.

[0007] A fourth aspect of the present application provides a refrigeration equipment.

[0008] Therefore, the first aspect of the present application provides a pump assembly, comprising: a body and a mounting portion; the body is provided with a receiving hole, the receiving hole penetrates through the body along the axial direction of the pump assembly, and the body has a first surface and a second surface; the mounting portion is connected with the body and located on the side of the body in the radial direction of the body; the mounting portion is provided with a mounting groove and a first hole; the mounting groove extends to the body along the radial direction of the body, and the first end of the mounting groove is in communication with the receiving hole; the first hole penetrates through the mounting portion along the axial direction of the pump assembly and is in communication with the second end of the mounting groove; the first hole comprises a first hole section and a second hole section, the first hole section is closer to the first surface than the second hole section, and in the radial direction of the body, the point farthest from the axis of the body on the side wall of the mounting portion away from the body is a first point, the minimum distance between the inner wall of the first hole section and the first point is a first distance, and the minimum distance between the inner wall of the second hole section and the first point is a second distance; the first distance is not equal to the second distance.

[0009] The pump assembly provided by the present application comprises a body, the body is provided with a containing hole penetrating through the body in the axial direction of the pump body, the containing hole is used to form a compression working space of refrigerant, and the containing hole is used to accommodate a piston which rotates along the inner side wall of the containing hole through a crankshaft.

[0010] The pump assembly further comprises a mounting portion provided with a mounting groove and a first hole penetrating through the mounting portion in the axial direction of the pump body. The first hole is in communication with the second end of the mounting groove, so that the mounting groove is used to place a sliding vane abutting against the outer surface of the piston, and the sliding vane can reciprocate in the mounting groove. The first hole can serve as a tool withdrawal hole for machining the mounting groove, thereby facilitating the machining of the mounting groove. Meanwhile, the first end of the mounting groove is in communication with the containing hole, so that the sliding vane and the piston jointly divide the containing hole into a suction chamber and a discharge chamber. When the pump assembly is in a working state, the crankshaft drives the piston to rotate, and the refrigerant of the pump assembly is compressed along with the rotation of the piston and is discharged when the pressure in the discharge chamber rises to a threshold value. In this process, the crankshaft tilts due to the pressure of the gas, thereby driving the piston to tilt; the first hole is divided into a first hole section and a second hole section according to the part closer to the first surface and the part closer to the second surface, and the farthest point from the body axis on the side wall of the mounting portion away from the body is set as a first point, the minimum distance from the inner wall of the first hole section to the first point is a first distance, the minimum distance from the inner wall of the second hole section to the first point is a second distance, and the first distance and the second distance are not equal. By setting the first distance to be unequal to the second distance, the wall thickness of the mounting portion corresponding to the first hole section and the wall thickness of the mounting portion corresponding to the second hole section have differences, thereby causing the rigidity of the mounting portion in the axial direction to have differences. Due to the differences in the rigidity of the mounting portion in the axial direction, the deformation amount of the sliding vane reciprocating in the mounting groove along the axial direction of the pump assembly has differences. Due to the differences in the deformation amount of the sliding vane along the axial direction of the pump assembly, the tilting direction of the sliding vane can be adjusted according to the tilting direction of the piston, the tilting direction of the sliding vane is better consistent with the tilting direction of the piston, thereby making the sliding vane and the piston in the containing hole maintain linear contact as much as possible, reducing the gap between the sliding vane and the piston. By setting the first distance to be unequal to the second distance, the deformation of the mounting portion can be adjusted according to the deformation of the crankshaft, the assembly gap between the components is reduced, thereby reducing the leakage of refrigerant from the discharge chamber directly back to the suction chamber through the assembly gap, reducing the leakage of refrigerant, and thereby improving the operating efficiency of the pump assembly.

[0011] Further, the first surface and the second surface on the body are the two planes farthest apart in the axial direction of the pump assembly.

[0012] Further, in the axial direction of the pump assembly, the first surface is located above the second surface.

[0013] Further, the body and the mounting portion can be an integrated structure or a split structure.

[0014] Further, the connecting mode of the mounting portion and the body can be fixed connection modes such as welding, bonding, and bolt connection.

[0015] Further, the rigidity of the pump assembly near the side of the mounting groove close to the first surface is greater than the rigidity of the side of the mounting groove close to the second surface.

[0016] Further, the first point on the side wall of the side of the mounting portion away from the body can be any point on the side wall, which is used to measure the thickness of the mounting portion.

[0017] Further, a circle is drawn with the distance from the first point to the center of the accommodating hole as a radius and the center of the accommodating hole as a center, which is used as an outer diameter surface of the pump assembly, and the outer diameter surface completely contains the pump assembly, which is used to measure the thickness of the mounting portion.

[0018] In addition, the pump assembly in the above technical solution provided by the application can also have the following additional technical features:

[0019] In some technical solutions of the application, optionally, the first distance is greater than the second distance.

[0020] In this embodiment, when the first distance is greater than the second distance, the wall thickness of the mounting portion corresponding to the first hole section is greater than the wall thickness corresponding to the second hole section, and the rigidity of the mounting portion corresponding to the first hole section is greater than the rigidity corresponding to the second hole section, that is, the rigidity of the side of the body close to the first surface is greater than the rigidity of the side close to the second surface, so that when the sliding vane mounted in the mounting groove is stressed, the deformation amount of the side close to the second surface is greater than the deformation amount of the side close to the first surface. Thus, the sliding vane is inclined, and the inclination is consistent with the inclination trend of the crankshaft, which can reduce the gap between the sliding vane and the eccentric shaft due to the inclination of the eccentric shaft of the crankshaft, thereby reducing the cold energy leakage of the pump assembly. And the inclination trend of the sliding vane is consistent with the inclination trend of the crankshaft when the first distance is greater than the second distance, so that the contact between the sliding vane and the crankshaft is closer to linear contact, further reducing the leakage of refrigerant from the exhaust cavity to the suction cavity, thereby improving the efficiency of the compressor.

[0021] In some technical solutions of the application, optionally, the diameter of the first hole section is not equal to the diameter of the second hole section.

[0022] In the embodiment, when the diameter of the first hole section is not equal to the diameter of the second hole section, the minimum distance from the inner wall of the first hole section to the outer wall of the mounting portion away from the body side is not equal to the minimum distance from the inner wall of the second hole section to the outer wall of the mounting portion away from the body side, and the wall thickness of the mounting portion corresponding to the first hole section is different from the wall thickness of the mounting portion corresponding to the second hole section, so that the rigidity of the mounting portion in the axial direction is different. Due to the difference in the rigidity of the mounting portion in the axial direction, the deformation amount of the sliding vane in the reciprocating movement in the mounting groove along the axial direction of the pump assembly is different. Due to the difference in the deformation amount of the sliding vane along the axial direction of the pump assembly, the tilting direction of the sliding vane can be adjusted according to the tilting direction of the piston, and the tilting direction of the sliding vane is better consistent with the tilting direction of the piston, so that the sliding vane and the piston in the accommodating hole can be kept in linear contact as much as possible, and the gap between the sliding vane and the piston is reduced.

[0023] In some technical solutions of the present application, optionally, the diameter of the first hole section is smaller than the diameter of the second hole section.

[0024] In the embodiment, the diameter of the first hole section is set to be smaller than the diameter of the second hole section, so that the wall thickness of the first hole section of the mounting portion is greater than the wall thickness of the second hole section, the minimum distance from the inner wall of the first hole section to the outer wall of the mounting portion away from the body side is greater than the minimum distance from the inner wall of the second hole section to the outer wall of the mounting portion away from the body side, and the rigidity of the mounting portion corresponding to the first hole section is greater than the rigidity of the mounting portion corresponding to the second hole section, and the deformation amount of the sliding vane corresponding to the first hole section is smaller than the deformation amount of the sliding vane corresponding to the second hole section. When the sliding vane in the mounting groove is stressed, the deformation amount near the second surface is greater than the deformation amount near the first surface. Thus, the sliding vane is tilted, and the tilting is consistent with the tilting trend of the crankshaft, so that the gap between the sliding vane and the eccentric shaft due to the tilting of the eccentric shaft of the crankshaft is reduced, and the cold energy leakage of the pump assembly is reduced.

[0025] In some technical solutions of the present application, optionally, the mounting portion is provided with a mounting hole extending in the radial direction of the body and communicating with the mounting groove; the pump assembly further comprises a crankshaft, a piston, a sliding vane and an elastic member; the crankshaft comprises a first shaft, a second shaft and a third shaft, the first shaft is connected with the second shaft, the second shaft is connected with the third shaft, and the axis of the second shaft is offset relative to the axis of the body; the piston is sleeved on the second shaft and located in the accommodating hole; the sliding vane is arranged in the mounting groove of the mounting portion, and the first side of the sliding vane abuts against the piston; and the elastic member is arranged in the mounting hole and connected with the second side of the sliding vane.

[0026] In the embodiment, the pump assembly comprises a sliding plate arranged in the mounting groove, a first side of the sliding plate abuts against the outer surface of the piston, so that the sliding plate and the piston jointly divide the accommodating hole into the suction cavity and the exhaust cavity, and a second side of the sliding plate is connected with the elastic member of the pump assembly, the elastic member is arranged in the mounting hole of the mounting portion, and the elastic member can tightly abut against the outer surface of the piston when the piston rotates, so that the gap between the sliding plate and the piston is reduced, and the operation efficiency of the pump assembly is improved.

[0027] The pump assembly further comprises a crankshaft, the crankshaft comprises a first shaft, a second shaft and a third shaft, the first shaft is connected with the second shaft, and the second shaft is connected with the third shaft, and the piston of the pump assembly is sleeved on the second shaft. Since the second axis is offset from the axis of the body, the piston does not rotate around the center of the accommodating hole, so that the space in the suction cavity and the exhaust cavity in the accommodating hole changes. The piston rotates to compress the refrigerant of the pump assembly, and the refrigerant is discharged when the pressure in the exhaust cavity reaches a threshold value.

[0028] Specifically, the elastic member can be one of a rotary spring, a gas spring and an oil-gas spring.

[0029] Further, the first shaft is a main shaft, the second shaft can be an eccentric shaft, and the third shaft is a secondary shaft.

[0030] In some technical solutions of the present application, optionally, the diameter of the first shaft is greater than the diameter of the third shaft.

[0031] In the embodiment, the diameter of the first shaft is greater than the diameter of the third shaft, so that when the piston is subjected to gas pressure, the deformation amount of the first shaft is smaller than the deformation amount of the second shaft, and the wall thickness of the mounting portion corresponding to the first shaft is smaller than the wall thickness corresponding to the second shaft, thereby saving the cost of the device.

[0032] In some technical solutions of the present application, optionally, the diameter of the mounting hole is a first diameter m; the first hole comprises a first hole section and a second hole section, in the radial direction of the body, the point farthest from the axis of the body on the side wall of the mounting portion away from the body is a first point, the minimum distance between the inner wall of the first hole section and the first point is a first distance c, and the minimum distance between the inner wall of the second hole section and the first point is a second distance d; the mounting portion is provided with a suction hole, in the axial direction of the pump assembly, the minimum distance between the inner wall of the suction hole and the second surface is a fourth distance f; the minimum distance between the inner wall of the accommodating hole and the first point is a fifth distance s; the distance between the first surface and the second surface is a sixth distance L; the diameter a of the first shaft, the diameter b of the third shaft, the first diameter m, the first distance c, the second distance d, the fourth distance f, the fifth distance s and the sixth distance L satisfy the following relationship:

[0033]

[0034] In the embodiment, the suction hole is arranged on the mounting portion, and is used to introduce gas outside the pump assembly into the accommodating cavity; the diameter a of the first shaft, the diameter b of the third shaft, the first diameter m, the first distance c, the second distance d, the fourth distance f, the fifth distance s and the sixth distance L are arranged, so that the sizes between the structures satisfy the following relationships:

[0035] The gap between the components is further reduced, the leakage of the refrigerant is reduced, and the operation efficiency of the pump assembly is further improved.

[0036] In some technical solutions of the present application, the pump assembly comprises a body and a mounting portion; the body is provided with an accommodating hole which penetrates the body along the axial direction of the pump assembly, and the body has a first surface and a second surface; the mounting portion is connected with the body and is located on the side of the body in the radial direction of the body; the mounting portion is provided with a suction hole which extends to the body along the radial direction of the pump assembly, and the first end of the suction hole is communicated with the accommodating hole, and the second end of the suction hole is communicated with the outside of the mounting portion; in the axial direction of the pump assembly, the minimum distance between the inner wall of the suction hole and the first surface is a third distance, and the minimum distance between the inner wall of the suction hole and the second surface is a fourth distance; the third distance is not equal to the fourth distance.

[0037] In the embodiment, the pump assembly comprises a body, and the body is provided with an accommodating hole which penetrates the body along the axial direction of the pump body, and the accommodating hole is used to form a compression working space of the refrigerant; the accommodating hole is used to accommodate a piston, and the piston rotates along the inner side wall of the accommodating hole through a crankshaft.

[0038] The pump assembly further comprises a mounting portion provided with a mounting groove and a first hole penetrating the mounting portion in the axial direction of the pump body. The first hole is in communication with the second end of the mounting groove, so that the mounting groove is used to place a sliding sheet abutting against the outer surface of the piston, and the sliding sheet can reciprocate in the mounting groove. The first hole can serve as a tool withdrawal hole for machining the mounting groove, thereby facilitating the machining of the mounting groove. Meanwhile, the first end of the mounting groove is in communication with the accommodating hole, so that the sliding sheet and the piston jointly separate the accommodating hole into two parts, one part containing the suction hole is the suction chamber, and the other part is the exhaust chamber. When the pump assembly is in a working state, the piston is driven to rotate by the crankshaft, and the refrigerant of the pump assembly is compressed along with the rotation of the piston, and is discharged when the pressure in the exhaust chamber rises to a threshold value. In this process, the crankshaft tilts due to the pressure of the gas, thereby driving the piston to tilt; the minimum distance between the inner wall of the suction hole and the first surface is a third distance, the minimum distance between the inner wall of the suction hole and the second surface is a fourth distance, and the third distance and the fourth distance are not equal. By setting the third distance to be different from the fourth distance, the wall thickness of the mounting portion corresponding to the vicinity of the first surface and the wall thickness of the mounting portion corresponding to the vicinity of the second surface have a difference, thereby causing the rigidity of the mounting portion in the axial direction to have a difference. Due to the difference in the rigidity of the mounting portion in the axial direction, the deformation amount of the sliding sheet reciprocating in the mounting groove in the axial direction of the pump assembly has a difference. Due to the difference in the deformation amount of the sliding sheet in the axial direction of the pump assembly, the tilting direction of the sliding sheet can be adjusted according to the tilting direction of the piston, and the tilting direction of the sliding sheet is better consistent with the tilting direction of the piston, thereby making the sliding sheet and the piston in the accommodating hole maintain linear contact as much as possible, reducing the gap between the sliding sheet and the piston. By setting the first distance to be different from the second distance, the deformation of the mounting portion can be adjusted according to the deformation of the crankshaft, the assembly gap between the components is reduced, thereby reducing the leakage of refrigerant from the exhaust chamber directly back to the suction chamber, reducing the leakage of refrigerant, and thereby improving the operating efficiency of the pump assembly.

[0039] Further, the first surface and the second surface on the body are the two planes farthest apart in the axial direction of the pump assembly.

[0040] Further, in the axial direction of the pump assembly, the first surface is located above the second surface.

[0041] Further, the body and the mounting portion can be an integral structure or a split structure.

[0042] Further, the mounting portion can further be provided with an exhaust notch.

[0043] Further, the connection mode of the mounting portion and the body can be fixed connection modes such as welding, bonding, bolt connection, etc.

[0044] Further, rigidity of the pump assembly near the one side of the mounting groove close to the first surface is greater than rigidity of the pump assembly near the one side of the mounting groove close to the second surface.

[0045] In some embodiments of the present application, optionally, the third distance is greater than the fourth distance.

[0046] In this embodiment, the third distance is set to be greater than the fourth distance, that is, the wall thickness of the mounting portion corresponding to the first surface is greater than the wall thickness corresponding to the second surface, the rigidity of the mounting portion corresponding to the first surface is greater than the rigidity corresponding to the second surface, the deformation amount of the sliding sheet corresponding to the first surface is less than the deformation amount corresponding to the second surface, and when the sliding sheet mounted in the mounting groove is stressed, the deformation amount near the second surface is greater than the deformation amount near the first surface. Thus, when the sliding sheet is inclined, the inclination is consistent with the inclination trend of the crankshaft, which can reduce the gap between the sliding sheet and the eccentric shaft caused by the inclination of the eccentric shaft, thereby reducing the leakage of cold energy of the pump assembly. Moreover, by setting the third distance to be greater than the fourth distance, the inclination trend of the sliding sheet is consistent with the inclination trend of the crankshaft, thereby making the contact between the sliding sheet and the crankshaft closer to linear contact, further reducing the leakage of refrigerant from the exhaust cavity to the suction cavity, and thereby improving the efficiency of the compressor.

[0047] The third aspect of the present application provides a compressor comprising the pump assembly according to any one of the preceding aspects.

[0048] The compressor provided in the present application comprises the pump assembly according to any one of the preceding embodiments, and thus has all the beneficial effects of the pump assembly according to any one of the preceding embodiments.

[0049] Specifically, the compressor can be a reciprocating compressor and a rotary compressor.

[0050] The fourth aspect of the present application provides a refrigeration device comprising the pump assembly or the compressor according to any one of the preceding aspects.

[0051] The refrigeration device provided in the present application comprises the pump assembly or the compressor according to any one of the preceding embodiments, and thus has all the beneficial effects of the pump assembly or the compressor according to any one of the preceding embodiments.

[0052] Specifically, the refrigeration device can be a refrigerator, an air conditioner, and a freezer.

[0053] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0054] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0055] Figure 1 A certain angle schematic view of a pump assembly according to an embodiment of the present application;

[0056] Figure 2 A top view of a pump assembly according to an embodiment of the present application;

[0057] Figure 3 A bottom view of a pump assembly according to an embodiment of the present application;

[0058] Figure 4 A side view of a pump assembly according to an embodiment of the present application in the direction of the mounting hole;

[0059] Figure 5 A side view of a crankshaft according to an embodiment of the present application;

[0060] Figure 6 A certain angle schematic view of a pump assembly according to an embodiment of the present application in the direction of the mounting hole;

[0061] Figure 7 A side view of a pump assembly according to an embodiment of the present application in the direction of the suction hole.

[0062] Correspondence between reference signs and component names in the above description is as follows: Figures 1 to 7

[0063] 10 pump assembly, 100 body, 110 accommodating hole, 120 first surface, 130 second surface, 200 mounting portion, 210 mounting groove, 220 first hole, 221 first hole section, 222 second hole section, 230 mounting hole, 240 suction hole, 250 exhaust gap, 260 first point, 270 outer diameter surface, 300 crankshaft, 310 first shaft, 320 second shaft, 330 third shaft, 400 piston, 500 sliding vane, 600 elastic member;

[0064] a diameter of the first shaft, b diameter of the third shaft, m first diameter, c first distance, d second distance, e third distance, f fourth distance, s fifth distance, y diameter of the first hole section, z diameter of the second hole section, A radial direction, B axial direction, L sixth distance. DETAILED DESCRIPTION

[0065] In order to make the above-mentioned objects, features and advantages of the present application clearer, the following will further describe the present application with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0066] ​In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the present application.

[0067] The following description is made with reference to the accompanying drawings in which Figures 1 to 7 A pump assembly 10, a compressor and a refrigeration device according to some embodiments of the present application are described.

[0068] The following description is made with reference to the accompanying drawings in which Figures 1 to 5 In one embodiment of the present application, a pump assembly 10 is provided, comprising: a body 100 and a mounting portion 200; the body 100 is provided with a receiving hole 110, the receiving hole 110 penetrates the body 100 along an axial direction B of the pump assembly 10, the body 100 has a first surface 120 and a second surface 130; the mounting portion 200 is connected with the body 100, the mounting portion 200 is located on a side of the body 100 in a radial direction A of the body 100; the mounting portion 200 is provided with a mounting groove 210 and a first hole 220; the mounting groove 210 extends to the body 100 along the radial direction A of the body 100, a first end of the mounting groove 210 is in communication with the receiving hole 110; the first hole 220 penetrates the mounting portion 200 along the axial direction B of the pump assembly 10, and is in communication with a second end of the mounting groove 210; the first hole 220 comprises a first hole section 221 and a second hole section 222, the first hole section 221 is closer to the first surface 120 than the second hole section 222, on the radial direction A of the body 100, a first point 260 is the point farthest from the axis of the body 100 on the side wall of the mounting portion 200 away from the body 100, a minimum distance between an inner wall of the first hole section 221 and the first point 260 is a first distance, a minimum distance between an inner wall of the second hole section 222 and the first point 260 is a second distance; the first distance is not equal to the second distance.

[0069] In this embodiment, the pump assembly 10 comprises a body 100, the body 100 is provided with a receiving hole 110 penetrating the body 100 along an axial direction B of the pump body, the receiving hole 110 is used to form a compression working space of a refrigerant, the receiving hole 110 is used to accommodate a piston 400, the piston 400 rotates along an inner side wall of the receiving hole 110 through a crankshaft 300.

[0070] The pump assembly 10 further comprises a mounting portion 200, which is provided with a mounting groove 210 and a first hole 220 penetrating the mounting portion 200 along the pump body axial direction B. The first hole 220 is in communication with the second end of the mounting groove 210, so that the mounting groove 210 is used to place the sliding vane 500 abutting against the outer surface of the piston 400, and the sliding vane 500 can reciprocate in the mounting groove 210. The first hole 220 can serve as a tool withdrawal hole for machining the mounting groove 210, thereby facilitating the machining of the mounting groove 210. At the same time, the first end of the mounting groove 210 is in communication with the accommodating hole 110, so that the sliding vane 500 and the piston 400 jointly separate the accommodating hole 110 into the suction chamber and the exhaust chamber. When the pump assembly 10 is in a working state, the piston 400 is driven to rotate by the crankshaft 300, and the refrigerant of the pump assembly 10 is compressed along with the rotation of the piston 400, and is discharged when the pressure in the exhaust chamber rises to a threshold value. In this process, the crankshaft 300 tilts due to the pressure of the gas, thereby driving the piston 400 to tilt; the first hole 220 is divided into a first hole section 221 and a second hole section 222 according to the part closer to the first surface 120 and the part closer to the second surface 130, and the farthest point from the axis of the body 100 on the side wall of the mounting portion 200 away from the body 100 is set as a first point 260, the minimum distance between the inner wall of the first hole section 221 and the first point 260 is a first distance, the minimum distance between the inner wall of the second hole section 222 and the first point 260 is a second distance, and the first distance is not equal to the second distance. By setting the first distance to be not equal to the second distance, the wall thickness corresponding to the first hole section 221 and the wall thickness corresponding to the second hole section 222 of the mounting portion 200 have differences, thereby causing the rigidity of the mounting portion 200 in the axial direction B to have differences. Due to the differences in the rigidity of the mounting portion 200 in the axial direction B, the deformation amount of the sliding vane 500 reciprocating in the mounting groove 210 along the axial direction B of the pump assembly 10 has differences. Due to the differences in the deformation amount of the sliding vane 500 along the axial direction B of the pump assembly 10, the tilting direction of the sliding vane 500 can be adjusted according to the tilting direction of the piston 400, and the tilting direction of the sliding vane 500 is better consistent with the tilting direction of the piston 400, thereby making the sliding vane 500 and the piston 400 in the accommodating hole 110 maintain linear contact as much as possible, reducing the gap between the sliding vane 500 and the piston 400. By setting the first distance to be not equal to the second distance, the deformation of the mounting portion 200 can be adjusted according to the deformation of the crankshaft 300, thereby reducing the assembly gap between the components, reducing the leakage of refrigerant through the assembly gap and directly flowing back to the suction chamber from the exhaust chamber, reducing the leakage of refrigerant, and thereby improving the operating efficiency of the pump assembly 10.

[0071] Further, the first surface 120 and the second surface 130 on the body 100 are the two planes farthest apart in the axial direction B of the pump assembly 10.

[0072] Further, the first surface 120 is above the second surface 130 along the axis direction of the pump assembly 10.

[0073] Further, the body 100 and the mounting portion 200 can be an integrated structure or a split structure.

[0074] Further, the connection mode between the mounting portion 200 and the body 100 can be welding, bonding, bolt connection, or other fixed connection modes.

[0075] Further, the rigidity of the pump assembly 10 near the mounting groove 210 on the side close to the first surface 120 is greater than the rigidity of the pump assembly 10 near the mounting groove 210 on the side close to the second surface 130.

[0076] Further, a circle is drawn with the distance from the first point 260 to the center of the accommodating hole as the radius and the center of the accommodating hole 110 as the center, as the outer diameter surface 270 of the pump assembly 10, and the outer diameter surface 270 completely includes the pump assembly 10, and this surface is used to measure the thickness of the mounting portion 200.

[0077] Further, the first point 260 on the side wall of the mounting portion 200 away from the body 100 can be any point on the side wall, and this point is used to measure the thickness of the mounting portion 200.

[0078] The embodiment provides a pump assembly 10, in addition to the technical features of the above-mentioned embodiments, the embodiment further includes the following technical features.

[0079] The first distance is greater than the second distance.

[0080] The following Figures 2 to 3 description, in this embodiment, when the first distance is greater than the second distance, the wall thickness of the mounting portion 200 corresponding to the first hole section 221 is greater than the wall thickness corresponding to the second hole section 222, and the rigidity of the mounting portion 200 corresponding to the first hole section 221 is greater than the rigidity corresponding to the second hole section 222, that is, the rigidity of the side of the body 100 close to the first surface 120 is greater than the rigidity of the side close to the second surface 130, and further, when the sliding vane 500 mounted in the mounting groove 210 is stressed, the deformation amount of the side close to the second surface 130 is greater than the deformation amount of the side close to the first surface 120. Thus, the sliding vane 500 is inclined, and the inclination is consistent with the inclination trend of the crankshaft 300, which can reduce the gap between the sliding vane 500 and the eccentric shaft (i.e., the second shaft 320) caused by the inclination of the eccentric shaft, and further reduce the cold energy leakage of the pump assembly 10.

[0081] And the first distance is set to be greater than the second distance, so that the tilting trend of the vane 500 is consistent with the tilting trend of the crankshaft, and further so that the contact between the vane 500 and the crankshaft 300 is closer to linear contact, further reducing the leakage of the refrigerant from the exhaust cavity to the suction cavity, and further improving the efficiency of the compressor.

[0082] Optionally, the first distance can also be less than the second distance.

[0083] When the first distance is set to be less than the second distance, the wall thickness of the mounting portion 200 corresponding to the first hole section 221 is less than the wall thickness corresponding to the second hole section 222, the rigidity of the mounting portion 200 corresponding to the first hole section 221 is less than the rigidity corresponding to the second hole section 222, the deformation amount of the vane 500 corresponding to the first hole section 221 is greater than the deformation amount corresponding to the second hole section 222, and further the deformation amount of the vane 500 in the axial direction B of the pump assembly 10 is different. When the pump assembly 10 is in a working state, the tilting direction of the vane 500 can be adjusted according to the tilting direction of the piston 400, so that the tilting direction of the vane 500 is better consistent with the tilting direction of the piston 400, and further so that the vane 500 and the piston 400 in the accommodating hole 110 can maintain linear contact as much as possible, and the gap between the vane 500 and the piston 400 is reduced.

[0084] The embodiment provides a pump assembly 10, in addition to the technical features of the above-mentioned embodiments, the embodiment further includes the following technical features.

[0085] The diameter y of the first hole section is not equal to the diameter z of the second hole section.

[0086] The following Figure 4 description, in this embodiment, when the diameter y of the first hole section is not equal to the diameter z of the second hole section, the minimum distance from the inner wall of the first hole section 221 to the outer side wall of the mounting portion 200 away from the body 100 side is not equal to the minimum distance from the inner wall of the second hole section 222 to the outer side wall of the mounting portion 200 away from the body 100 side, and further so that the wall thickness of the mounting portion 200 corresponding to the first hole section 221 and the wall thickness corresponding to the second hole section 222 have differences, and the rigidity of the mounting portion 200 in the axial direction B is different. Because the rigidity of the mounting portion 200 in the axial direction B is different, the deformation amount of the vane 500 reciprocating in the mounting groove 210 along the axial direction B of the pump assembly 10 is different. Because the deformation amount of the vane 500 along the axial direction B of the pump assembly 10 is different, the tilting direction of the vane 500 can be adjusted according to the tilting direction of the piston 400, and the tilting direction of the vane 500 is better consistent with the tilting direction of the piston 400, and further so that the vane 500 and the piston 400 in the accommodating hole 110 can maintain linear contact as much as possible, and the gap between the vane 500 and the piston 400 is reduced.

[0087] The embodiment provides a pump assembly 10, and the embodiment further comprises the following technical features in addition to the technical features of the above embodiment.

[0088] The diameter y of the first hole section is less than the diameter z of the second hole section.

[0089] The following will be described with reference to Figure 4 In the embodiment, the diameter y of the first hole section is set to be less than the diameter z of the second hole section, so that the wall thickness of the first hole section 221 of the mounting portion 200 is greater than the wall thickness of the second hole section 222, the minimum distance from the inner wall of the first hole section 221 to the outer side wall of the mounting portion 200 away from the body 100 is greater than the minimum distance from the inner wall of the second hole section 222 to the outer side wall of the mounting portion 200 away from the body 100, and further, the rigidity of the mounting portion 200 corresponding to the first hole section 221 is greater than the rigidity of the mounting portion 200 corresponding to the second hole section 222, the deformation amount of the sliding sheet 500 corresponding to the first hole section 221 is less than the deformation amount of the sliding sheet 500 corresponding to the second hole section 222, and when the sliding sheet 500 mounted in the mounting groove 210 is stressed, the deformation amount close to the second surface 130 is greater than the deformation amount close to the first surface 120. Therefore, the sliding sheet 500 is inclined, the inclination is consistent with the inclination trend of the crankshaft 300, the gap between the sliding sheet 500 and the eccentric shaft (i.e., the second shaft 320) caused by the inclination of the eccentric shaft can be reduced, and further, the cold energy leakage of the pump assembly 10 can be reduced.

[0090] Optionally, the diameter y of the first hole section can also be greater than the diameter z of the second hole section.

[0091] The diameter y of the first hole section is set to be greater than the diameter z of the second hole section, the minimum distance from the inner wall of the first hole section 221 to the outer side wall of the mounting portion 200 away from the body 100 is less than the minimum distance from the inner wall of the second hole section 222 to the outer side wall of the mounting portion 200 away from the body 100, the wall thickness of the mounting portion 200 corresponding to the first hole section 221 is less than the wall thickness of the mounting portion 200 corresponding to the second hole section 222, the rigidity of the mounting portion 200 corresponding to the first hole section 221 is less than the rigidity of the mounting portion 200 corresponding to the second hole section 222, the deformation amount of the sliding sheet 500 corresponding to the first hole section 221 is greater than the deformation amount of the sliding sheet 500 corresponding to the second hole section 222, and further, the deformation amount of the sliding sheet 500 in the axial direction B of the pump assembly 10 is different. When the pump assembly 10 is in a working state, the inclination direction of the sliding sheet 500 can be adjusted according to the inclination direction of the piston 400, so that the inclination direction of the sliding sheet 500 is better consistent with the inclination direction of the piston 400, and further, the sliding sheet 500 and the piston 400 in the accommodating hole 110 can be kept in linear contact as much as possible, and the gap between the sliding sheet 500 and the piston 400 can be reduced.

[0092] The embodiment provides a pump assembly 10, and the embodiment further comprises the following technical features in addition to the technical features of the above embodiment.

[0093] The mounting portion 200 is provided with a mounting hole 230 extending along the radial direction A of the body 100 and communicating with the mounting groove 210; the pump assembly 10 further comprises a crankshaft 300, a piston 400, a sliding vane 500 and an elastic member 600; the crankshaft 300 comprises a first shaft 310, a second shaft 320 and a third shaft 330, the first shaft 310 is connected with the second shaft 320, the second shaft 320 is connected with the third shaft 330, and the axis of the second shaft 320 is offset relative to the axis of the body 100; the piston 400 is sleeved on the second shaft 320 and located in the accommodating hole 110; the sliding vane 500 is arranged in the mounting groove 210 of the mounting portion 200, and the first side of the sliding vane 500 abuts against the piston 400; the elastic member 600 is arranged in the mounting hole 230 and connected with the second side of the sliding vane 500.

[0094] The following Figure 3 and Figure 5 are described, in this embodiment, the pump assembly 10 comprises a sliding vane 500 arranged in the mounting groove 210, the first side of the sliding vane 500 abutting against the outer surface of the piston 400, so that the sliding vane 500 and the piston 400 jointly divide the accommodating hole 110 into the suction chamber and the exhaust chamber, the second side of the sliding vane 500 is connected with the elastic member 600 of the pump assembly 10, the elastic member 600 is arranged in the mounting hole 230 of the mounting portion 200, and the elastic member 600 can make the sliding vane 500 tightly abut against the outer surface of the piston 400 when the piston 400 rotates, thereby reducing the gap between the sliding vane 500 and the piston 400, and improving the operating efficiency of the pump assembly 10.

[0095] The pump assembly 10 further comprises a crankshaft 300, the crankshaft 300 comprises a first shaft 310, a second shaft 320 and a third shaft 330, the first shaft 310 is connected with the second shaft 320, and the second shaft 320 is connected with the third shaft 330, wherein the piston 400 of the pump assembly 10 is sleeved on the second shaft 320. Since the axis of the second shaft 320 is offset relative to the axis of the body 100, the piston 400 does not rotate around the center of the accommodating hole 110, so that the space in the suction chamber and the exhaust chamber in the accommodating hole 110 changes. The rotation of the piston 400 realizes the compression of the refrigerant of the pump assembly 10, and the refrigerant is discharged when the pressure in the exhaust chamber reaches a threshold value.

[0096] Specifically, the elastic member 600 can be one of a rotary spring, a gas spring and an oil-gas spring.

[0097] Further, the first shaft 310 can be a main shaft, the second shaft 320 can be an eccentric shaft, and the third shaft 330 can be a secondary shaft.

[0098] The present embodiment provides a pump assembly 10, in addition to the technical features of the above-mentioned embodiments, the present embodiment further comprises the following technical features.

[0099] The diameter of the first shaft 310 is greater than the diameter of the third shaft 330.

[0100] With reference to the following description Figure 5 In this embodiment, the diameter of the first shaft 310 is set to be greater than the diameter of the third shaft 330, so that when the piston 400 is subjected to gas pressure, the deformation amount of the first shaft 310 is less than the deformation amount of the second shaft 320, and the wall thickness of the mounting portion 200 corresponding to the first shaft 310 is less than the wall thickness corresponding to the second shaft 320, thereby saving device costs.

[0101] The present embodiment provides a pump assembly 10, in addition to the technical features of the above-mentioned embodiments, further comprising the following technical features.

[0102] With reference to the following description Figures 2 to 6 In this embodiment, the diameter of the first shaft 310 is set to be greater than the diameter of the third shaft 330, so that when the piston 400 is subjected to gas pressure, the deformation amount of the first shaft 310 is less than the deformation amount of the second shaft 320, and the wall thickness of the mounting portion 200 corresponding to the first shaft 310 is less than the wall thickness corresponding to the second shaft 320, thereby saving device costs.

[0103]

[0104] In this embodiment, the gas suction hole 240 is provided on the mounting portion 200, which is used to introduce gas outside the pump assembly 10 into the accommodation cavity, and the diameter a of the first shaft 310, the diameter b of the third shaft 330, the first diameter m, the first distance c, the second distance d, the fourth distance f, the fifth distance s, and the sixth distance L are set to satisfy the following relationship: Further reducing the gap between each component, reducing the leakage of refrigerant, and thereby improving the operating efficiency of the pump assembly 10.

[0105] Further, the minimum distance between the inner wall of the gas suction hole 240 and the first surface 120 is a third distance e.

[0106] In one embodiment of the present application, a pump assembly 10 is provided, comprising a body 100 and a mounting portion 200; the body 100 is provided with a receiving hole 110 extending through the body 100 along an axial direction B of the pump assembly 10, the body 100 having a first surface 120 and a second surface 130; the mounting portion 200 is connected with the body 100, and is located at a side of the body 100 in a radial direction A of the body 100; the mounting portion 200 is provided with a suction hole 240 extending to the body 100 along the radial direction A of the pump assembly 10, a first end of the suction hole 240 being in communication with the receiving hole 110, and a second end of the suction hole 240 being in communication with an outside of the mounting portion 200; in the axial direction B of the pump assembly 10, a minimum distance between an inner wall of the suction hole 240 and the first surface 120 is a third distance e, and a minimum distance between the inner wall of the suction hole 240 and the second surface 130 is a fourth distance f; the third distance e is not equal to the fourth distance f.

[0107] Reference will now be made to the following description Figures 2 to 7 In this embodiment, the pump assembly 10 of the present application comprises a body 100, the body 100 is provided with a receiving hole 110 extending through the body 100 along an axial direction B of the pump body, the receiving hole 110 is used to form a compression working space of refrigerant, and the receiving hole 110 is used to accommodate a piston 400, the piston 400 rotates along an inner side wall of the receiving hole 110 through a crankshaft 300.

[0108] The pump assembly 10 further comprises a mounting portion 200, which is provided with a mounting groove 210 and a first hole 220 penetrating the mounting portion 200 along the pump body axial direction B. The first hole 220 is in communication with the second end of the mounting groove 210, so that the mounting groove 210 is used to place the sliding sheet 500 abutting against the outer surface of the piston 400, and the sliding sheet 500 can reciprocate in the mounting groove 210. The first hole 220 can serve as a tool withdrawal hole for machining the mounting groove 210, thereby facilitating the machining of the mounting groove 210. At the same time, the first end of the mounting groove 210 is in communication with the accommodating hole 110, so that the sliding sheet 500 and the piston 400 jointly separate the accommodating hole 110 into an air suction cavity containing the air suction hole 240 and an air exhaust cavity. When the pump assembly 10 is in a working state, the piston 400 is driven to rotate by the crankshaft 300, and the refrigerant of the pump assembly 10 is compressed along with the rotation of the piston 400, and is discharged when the pressure in the air exhaust cavity rises to a threshold value. In this process, the crankshaft 300 tilts due to the pressure of the gas, thereby driving the piston 400 to tilt; the minimum distance between the inner wall of the air suction hole 240 and the first surface 120 is a third distance e, and the minimum distance between the inner wall of the air suction hole 240 and the second surface 130 is a fourth distance f, and the third distance e and the fourth distance f are not equal. By setting the third distance e to be not equal to the fourth distance f, the wall thickness corresponding to the vicinity of the first surface 120 and the wall thickness corresponding to the vicinity of the second surface 130 on the mounting portion 200 are different, thereby making the rigidity of the mounting portion 200 in the axial direction B different. Due to the difference in the rigidity of the mounting portion 200 in the axial direction B, the deformation amount of the sliding sheet 500 reciprocating in the mounting groove 210 along the axial direction B of the pump assembly 10 is different. Due to the difference in the deformation amount of the sliding sheet 500 along the axial direction B of the pump assembly 10, the tilting direction of the sliding sheet 500 can be adjusted according to the tilting direction of the piston 400, and the tilting direction of the sliding sheet 500 is better consistent with the tilting direction of the piston 400, thereby making the sliding sheet 500 and the piston 400 in the accommodating hole 110 maintain linear contact as much as possible, and reducing the gap between the sliding sheet 500 and the piston 400. By setting the first distance to be not equal to the second distance, the deformation of the mounting portion 200 can be adjusted according to the deformation of the crankshaft 300, the assembly gap between the components is reduced, thereby reducing the leakage of refrigerant from the air exhaust cavity directly back to the air suction cavity through the assembly gap, reducing the leakage of refrigerant, and thereby improving the operating efficiency of the pump assembly 10.

[0109] Further, the first surface 120 and the second surface 130 on the body 100 are the two planes farthest apart in the axial direction B of the pump assembly 10.

[0110] Further, along the axial direction of the pump assembly 10, the first surface 120 is located above the second surface 130.

[0111] Further, the body 100 and the mounting portion 200 can be an integrated structure or a split structure.

[0112] Further, the mounting portion 200 can be further provided with an exhaust gap 250.

[0113] Further, the connection mode of the mounting portion 200 and the body 100 can be welding, bonding, bolt connection, etc.

[0114] Further, the rigidity of the pump assembly 10 near the one side of the mounting groove 210 close to the first surface 120 is greater than the rigidity of the pump assembly 10 near the other side of the mounting groove 210 close to the mounting portion 200.

[0115] The embodiment provides a pump assembly 10, in addition to the technical features of the above-mentioned embodiments, the embodiment further includes the following technical features.

[0116] The third distance e is greater than the fourth distance f.

[0117] The following will be described with reference to Figure 3 and Figure 5 In the embodiment, the third distance e is set to be greater than the fourth distance f, the wall thickness of the mounting portion 200 corresponding to the first surface 120 is greater than the wall thickness corresponding to the second surface 130, the rigidity of the mounting portion 200 corresponding to the first surface 120 is greater than the rigidity corresponding to the second surface 130, the deformation amount of the vane 500 corresponding to the first surface 120 is less than the deformation amount corresponding to the second surface 130, and when the vane 500 mounted in the mounting groove 210 is stressed, the deformation amount near the second surface 130 is greater than the deformation amount near the first surface 120. Therefore, the vane 500 is inclined, the inclination is consistent with the inclination trend of the crankshaft 300, the gap between the vane 500 and the eccentric shaft (i.e. the second shaft 320) caused by the inclination of the eccentric shaft can be reduced, and the cold energy leakage of the pump assembly 10 can be reduced.

[0118] And the third distance e is set to be greater than the fourth distance f, so that the inclination trend of the vane 500 is consistent with the inclination trend of the crankshaft, and the contact between the vane 500 and the crankshaft 300 is closer to linear contact, further reducing the leakage of refrigerant from the exhaust cavity to the suction cavity, and further improving the efficiency of the compressor.

[0119] Optionally, the third distance e can also be less than the fourth distance f.

[0120] When the third distance e is set to be less than the fourth distance f, the mounting portion 200 is provided with the air suction hole 240 near the first surface 120, the wall thickness of the mounting portion 200 corresponding to the first surface 120 is less than the wall thickness corresponding to the second surface 130, the rigidity of the mounting portion 200 corresponding to the first surface 120 is less than the rigidity corresponding to the second surface 130, the deformation amount of the sliding vane 500 corresponding to the first surface 120 is greater than the deformation amount corresponding to the second surface 130, and the deformation amount of the sliding vane 500 in the axial direction B of the pump assembly 10 is different. When the pump assembly 10 is in the working state, the inclination direction of the sliding vane 500 can be adjusted according to the inclination direction of the piston 400, so that the inclination directions of the sliding vane 500 and the piston 400 are better consistent, and the sliding vane 500 and the piston 400 in the accommodating hole 110 are kept in linear contact as much as possible, and the gap between the sliding vane 500 and the piston 400 is reduced.

[0121] In an embodiment of the present application, a compressor is provided, which comprises the pump assembly 10 in any of the above embodiments.

[0122] The compressor provided in the present application comprises the pump assembly 10 in any of the above embodiments, and thus has all the beneficial effects of the pump assembly 10 in any of the above embodiments.

[0123] Specifically, the compressor can be a reciprocating compressor and a rotary compressor.

[0124] In an embodiment of the present application, a refrigeration device is provided, which comprises the pump assembly 10 or the compressor in any of the above embodiments.

[0125] The refrigeration device provided in the present application comprises the pump assembly 10 or the compressor in any of the above embodiments, and thus has all the beneficial effects of the pump assembly 10 or the compressor in any of the above embodiments.

[0126] Specifically, the refrigeration device can be a refrigerator, an air conditioner, and a freezer.

[0127] In the claims, the specification, and the drawings of the application, terms such as "a plurality" and "a plurality of" encompass two or more instances. The terms "upper" and "lower" are used for convenience with reference to the orientation of the figures and are not limiting. The terms "connected" and "coupled" are not restricted to physical or mechanical connections or couplings. Rather, these connections can be any form of connection or coupling, whether direct or indirect, physical or logical, and can involve the medium of electrical or electronic data signals.

[0128] In the claims, the specification, and the drawings of the application, terms such as "a plurality" and "a plurality of" encompass two or more instances. The terms "upper" and "lower" are used for convenience with reference to the orientation of the figures and are not limiting. The terms "connected" and "coupled" are not restricted to physical or mechanical connections or couplings. Rather, these connections can be any form of connection or coupling, whether direct or indirect, physical or logical, and can involve the medium of electrical or electronic data signals.

[0129] The preferred embodiments of the application are described above in detail. The application may, however, be embodied in various ways without being limited to the embodiments described above, and various changes and modifications can be suggested to one skilled in the art. It is intended to encompass any modification or alteration within the scope of the application.

Claims

1. A pump assembly characterized by, The pump assembly comprises: a body provided with a receiving hole penetrating through the body in the axial direction of the pump assembly, the body having a first surface and a second surface which are the two planes farthest apart in the axial direction of the pump assembly; a mounting portion connected with the body and located laterally to the body in the radial direction of the body; the mounting portion is provided with a mounting groove and a first hole; the mounting groove extends to the body in the radial direction of the body, and a first end of the mounting groove is in communication with the receiving hole; the first hole penetrates through the mounting portion in the axial direction of the pump assembly and is in communication with a second end of the mounting groove; the first hole comprises a first hole section and a second hole section, the first hole section is closer to the first surface than the second hole section, a point farthest apart from the axis of the body on the side wall of the mounting portion away from the body in the radial direction of the body is a first point, the minimum distance between the inner wall of the first hole section and the first point is a first distance c, and the minimum distance between the inner wall of the second hole section and the first point is a second distance d; the first distance is not equal to the second distance; the mounting portion is provided with a mounting hole extending in the radial direction of the body and in communication with the mounting groove, and the pump assembly further comprises: a crankshaft comprising a first shaft, a second shaft and a third shaft, the first shaft is connected with the second shaft, and the second shaft is connected with the third shaft, and the axis of the second shaft is offset relative to the axis of the body; the diameter of the first shaft is greater than the diameter of the third shaft; the diameter of the mounting hole is a first diameter m; the mounting portion is provided with an air inlet hole, and the minimum distance between the inner wall of the air inlet hole and the second surface in the axial direction of the pump assembly is a fourth distance f; the minimum distance between the inner wall of the receiving hole and the first point is a fifth distance s; the distance between the first surface and the second surface is a sixth distance L; the diameter a of the first shaft, the diameter b of the third shaft, the first diameter m, the first distance c, the second distance d, the fourth distance f, the fifth distance s and the sixth distance L satisfy the following relationship: the diameter of the first hole section is smaller than the diameter of the second hole section, and the wall thickness of the first hole section is greater than the wall thickness of the second hole section.

2. The pump assembly of claim 1, wherein, The first distance is greater than the second distance.

3. The pump assembly of claim 1 or 2, wherein, The pump assembly further comprises: a piston sleeved on the second shaft and located in the receiving hole; a sliding sheet arranged in the mounting groove of the mounting portion, the first side of the sliding sheet abutting against the piston; a resilient member arranged in the mounting hole and connected with the second side of the sliding sheet.

4. A compressor characterized by, The pump assembly comprises the pump assembly according to any one of claims 1 to 3.

5. A refrigeration appliance characterized in that, The pump assembly comprises: the pump assembly according to any one of claims 1 to 3; or the compressor according to claim 4. ​

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