Pump body assembly and compressor

Abstract

The present invention provides a pump body assembly and a compressor, wherein the pump body assembly includes a crankshaft, a cylinder is provided on the crankshaft; a first bearing, the first bearing is sleeved on the crankshaft, and the first bearing is located on one side of the cylinder, a first exhaust hole is provided on the first bearing, a groove and a mounting seat are provided on the end face of the first bearing facing the first bearing, a valve plate is provided on the mounting seat, and the valve plate is opposite to the groove; a first cylinder head, the first cylinder head is located between the first bearing and the cylinder, the first cylinder head is sleeved on the crankshaft, a second exhaust hole is provided on the first cylinder head, and the gas in the cylinder can be discharged through the second exhaust hole; the valve plate can move in the groove to connect or disconnect the second exhaust hole with the first exhaust hole. According to the present invention, the defect of the exhaust valve seat of the compressor in the prior art being provided on the end face of the working chamber, which causes deformation of the end face of the working chamber, can be overcome, thereby improving the reliability of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a pump body assembly and a compressor. Background Art

[0002] In existing rotary compressors, the exhaust valve seat is set on the end face of the working chamber. Due to the weak rigidity of the exhaust valve seat, when the exhaust valve seat discharges high-temperature and high-pressure gas, it will directly affect the end face of the working chamber, causing deformation of the end face of the working chamber, resulting in end face wear and leakage of the working chamber.

[0003] Since the compressor in the prior art has technical problems such as the exhaust valve seat being arranged on the end face of the working chamber, which causes deformation of the end face of the working chamber, the present invention studies and designs a pump body assembly and a compressor. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the exhaust valve seat of the compressor is set on the end face of the working chamber, which causes deformation of the end face of the working chamber, thereby providing a pump body assembly and a compressor.

[0005] In order to solve the above problems, the present invention provides a pump body assembly, which includes:

[0006] a crankshaft, wherein a cylinder is provided on the crankshaft;

[0007] a first bearing, wherein the first bearing is sleeved on the crankshaft and is located on one side of the cylinder, and a first exhaust hole is provided on the first bearing;

[0008] a first cylinder head, the first cylinder head being located between the first bearing and the cylinder, the first cylinder head being sleeved on the crankshaft, the first cylinder head being provided with a second exhaust hole, through which gas in the cylinder can be discharged; an end surface of the first bearing facing the first cylinder head being provided with a groove and a mounting seat, the mounting seat being provided with a valve plate, the valve plate being opposite to the groove;

[0009] The valve plate can move in the groove to connect or disconnect the second exhaust hole with the first exhaust hole.

[0010] In some embodiments, the first cylinder head includes a skirt, a connecting portion, and a second chassis, the skirt is arranged on the outer peripheral wall of the second chassis, the first bearing is connected to the skirt, the connecting portion is located on the second chassis, and the connecting portion is located between the second chassis and the first bearing, so that a first cavity is formed between the second chassis and the first bearing.

[0011] In some embodiments, the pump body assembly also includes a shell, the skirt is connected to the inner wall of the shell, the outer peripheral wall of the first bearing is threadedly connected to the inner peripheral wall of the skirt, or a plurality of fixing parts are provided on the first bearing, and the fixing parts pass through the first bearing and the second chassis in sequence and are connected to the cylinder.

[0012] In some embodiments, the first bearing includes a first neck, a first middle portion and a first chassis, the first neck, the first middle portion and the first chassis all have an inner hole, the crankshaft passes through the inner holes of the first neck, the first middle portion and the first chassis in sequence, the first chassis is close to the first cylinder head relative to the first neck, the inner hole of the first middle portion and the inner hole diameter of the first chassis are the same, the inner hole diameter of the first chassis is larger than the inner hole diameter of the first neck and the inner diameter of the first cylinder head, and the inner hole diameter of the first neck is not larger than the inner diameter of the first cylinder head, and the first neck and the first cylinder head can limit the crankshaft.

[0013] In some embodiments, the inner bore diameter of the first neck is D1, the inner diameter of the first cylinder head is D3, and the outer diameter of the crankshaft is D, which satisfies D1-D=10-20 μm and D3-D=10-20 μm.

[0014] In some embodiments, an annular groove is provided on the inner wall of the first middle portion, an oil delivery hole is provided on the crankshaft along the axial direction of the crankshaft, and an oil outlet hole is also provided on the crankshaft along the radial direction of the crankshaft. The first neck, the first middle portion, the first cylinder head and the crankshaft enclose a second cavity, and the oil outlet hole is communicated with the second cavity.

[0015] In some embodiments, the annular groove extends along the circumference of the first middle portion, and a plurality of the annular grooves are provided along the axial direction of the crankshaft, and the annular grooves are capable of storing lubricating oil.

[0016] In some embodiments, the pump body assembly further includes a second bearing and a second cylinder head, the second bearing and the second cylinder head are located on the other side of the cylinder, the second bearing and the second cylinder head are sleeved on the crankshaft, and the second cylinder head is located between the second bearing and the cylinder.

[0017] In some embodiments, the second bearing includes a second neck, a second middle portion and a third chassis, the second neck, the second middle portion and the third chassis all have an inner hole, the crankshaft passes through the inner holes of the second neck, the second middle portion and the third chassis in sequence, the inner hole diameters of the second middle portion and the third chassis are the same, the inner hole diameter of the third chassis is larger than the inner hole diameter of the second neck and the inner diameter of the second cylinder head, and the inner hole of the second neck is not larger than the inner diameter of the second cylinder head, and the second neck and the second cylinder head can limit the crankshaft.

[0018] The present invention also provides a compressor, which includes the pump body assembly described in any of the preceding items.

[0019] The pump assembly and compressor provided by the present invention have the following beneficial effects:

[0020] The valve plate is opposite to the groove, and the first cylinder head is the upper end face of the working chamber of the compressor. The mounting seat is not arranged on the first cylinder head constituting the end face of the working chamber, but is arranged on the end face of the first bearing facing the first cylinder head. The valve plate is installed on the mounting seat to realize the exhaust channel of the high-pressure refrigerant inside the working chamber. By utilizing the current cooperation between the first bearing and the first cylinder head, the limitation of the exhaust valve plate can be realized. At the same time, when the cooperation space between the first bearing and the first cylinder head is used, it can also be realized that when the high-pressure refrigerant is discharged and enters the above-mentioned cooperation space, the flow rate of the high-pressure refrigerant can be reduced, thereby reducing the impact and noise problems caused by the discharge of high-pressure gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the pump assembly of the present invention;

[0022] Figure 2 A top view of a first bearing in a pump assembly of the present invention;

[0023] Figure 3 is a cross-sectional view of a first bearing in a pump assembly of the present invention;

[0024] Figure 4 A bottom view of the first bearing in the pump assembly of the present invention;

[0025] Figure 5 for Figure 4 Cross-sectional view at AA in the middle;

[0026] Figure 6 A top view of the first cylinder head in the pump assembly of the present invention;

[0027] Figure 7 is a cross-sectional view of the first cylinder head in the pump body assembly of the present invention;

[0028] Figure 8A top view of the second cylinder head in the pump assembly of the present invention;

[0029] Figure 9 is a cross-sectional view of the second cylinder head in the pump body assembly of the present invention;

[0030] Figure 10 A top view of the second bearing in the pump assembly of the present invention;

[0031] Figure 11 is a cross-sectional view of the second bearing in the pump assembly of the present invention;

[0032] Figure 12 It is an assembly drawing of the pump body assembly of the present invention;

[0033] Figure 13 It is an assembly diagram of the first bearing and the first cylinder head in the pump body assembly of the present invention;

[0034] Figure 14 for Figure 13 Exploded diagram;

[0035] The reference numerals indicate:

[0036] 1. Crankshaft; 2. First bearing; 21. First neck portion; 22. First middle portion; 23. First chassis; 231. Mounting seat; 232. Groove; 24. First connecting hole; 25. First exhaust hole; 26. Second connecting hole; 3. First cylinder head; 31. Skirt; 32. Connecting portion; 33. Second chassis; 34. Third connecting hole; 35. Second exhaust hole; 36. Fourth connecting hole; 4. Cylinder; 5. Fixing member; 6. Housing; 7. Roller; 8. Second cylinder head; 81. Fifth connecting hole; 9. Second bearing; 91. Second neck portion; 92. Second middle portion; 93. Third chassis; 94. Sixth connecting hole. DETAILED DESCRIPTION

[0037] See also Figures 1 to 14 As shown, according to an embodiment of the present invention, a pump body assembly is provided, comprising:

[0038] A crankshaft 1, on which a cylinder 4 is provided;

[0039] a first bearing 2, the first bearing 2 being sleeved on the crankshaft 1 and located on one side of the cylinder 4, and having a first exhaust hole 25;

[0040] A first cylinder head 3 is located between the first bearing 2 and the cylinder 4 and is sleeved on the crankshaft 1. The first cylinder head 3 is provided with a second exhaust hole 35 through which gas in the cylinder 4 can be discharged. A groove 232 and a mounting seat 231 are provided on the end surface of the first bearing 2 facing the first cylinder head 3. A valve plate is provided on the mounting seat 231, and the valve plate is opposite to the groove 232.

[0041] The valve plate can move in the groove 232 to connect or disconnect the second exhaust hole 35 with the first exhaust hole 25. In this technical solution, the valve plate is opposite to the groove 232, and the upper flange of the pump body assembly is composed of a first bearing 2 and a first cylinder head 3. The first cylinder head 3 is the upper end face of the working chamber of the compressor. The mounting seat 231 is not arranged on the first cylinder head 3 that constitutes the end face of the working chamber, but is arranged on the end face of the first bearing 2 facing the first cylinder head 3. The valve plate is mounted on the mounting seat 231 to realize the exhaust channel of the high-pressure refrigerant inside the working chamber. By utilizing the current cooperation of the first bearing 2 and the first cylinder head 3, the limitation of the exhaust valve plate can be realized. At the same time, when the cooperation space between the first bearing 2 and the first cylinder head 3 is provided, it can also be realized that when the high-pressure refrigerant is discharged and enters the above-mentioned cooperation space, the flow rate of the high-pressure refrigerant can be reduced, thereby reducing the impact and noise problems caused by the discharge of high-pressure gas. In some embodiments, in combination with reference to Figure 6 and Figure 7 As shown, the first cylinder head 3 includes a skirt 31, a connecting portion 32 and a second chassis 33. The skirt 31 is arranged on the outer peripheral wall of the second chassis 33. The first bearing 2 is connected to the skirt 31. The connecting portion 32 is located on the second chassis 33. Moreover, the connecting portion 32 is located between the second chassis 33 and the first bearing 2, so that a first cavity is formed between the second chassis 33 and the first bearing 2. In this technical solution, the connecting portion 32 is located between the second chassis 33 and the first chassis 23, so that a second cavity is formed between the second chassis 33 and the first chassis 23. When the high-pressure refrigerant is discharged from the cylinder and enters the second cavity, the flow rate of the high-pressure refrigerant can be reduced, thereby reducing the impact and noise problems caused by the discharge of high-pressure gas;

[0042] In the present invention, the first cylinder head 3 and the second cylinder head 8 are installed on both sides of the axial direction of the cylinder 4, forming the upper and lower end surfaces of the working chamber, and cooperate with the cylinder 4 to form a closed space for the suction and compression of the refrigerant; the constraint method of the crankshaft 1 is that the long axis of the crankshaft 1 is assembled in the first neck 21 and the inner hole of the first cylinder head 3, and the short axis of the crankshaft 1 is assembled in the inner hole of the second cylinder head 8 and the second neck 91. The long axis and the short axis of the crankshaft 1 are restrained by the micron-level clearance between the first neck 21, the first cylinder head 3, the second cylinder head 8 and the second neck 91 and the long axis and the short axis of the crankshaft 1 respectively; the valve plate is assembled on the first bearing by rivets 2, the free end of the valve disc cooperates with the second exhaust hole 35 of the first cylinder head 3 to close the exhaust hole of the working chamber. When the refrigerant pressure in the working chamber reaches the exhaust pressure, the free end of the valve disc moves away from the second exhaust hole 35 of the first cylinder head 3 and opens upward, contacts the end surface of the mounting seat 231 and cannot continue to rise. As the valve disc opens, the high-pressure refrigerant is discharged from the working chamber and enters the opening and closing accommodating cavity formed between the mounting seat 231 and the first cylinder head 3. After that, the high-pressure refrigerant is completely discharged from the pump body assembly through the first exhaust hole 25. At the same time, the mounting seat 231 replaces the lift limiter to limit the valve disc and prevent it from over-opening.

[0043] In some embodiments, in conjunction with Figure 1 、 Figure 13 and Figure 14 As shown, the pump body assembly also includes a shell 6, the skirt 31 is connected to the inner wall of the shell 6, the outer peripheral wall of the first bearing 2 is threadedly connected to the inner peripheral wall of the skirt 31, or, a plurality of fixing parts 5 are provided on the first bearing 2, and the fixing parts 5 pass through the first bearing 2 and the second chassis 33 in sequence and are connected to the cylinder 4. In this technical solution, a plurality of fixing members 5 are provided on the first bearing 2, and the fixing members 5 pass through the first bearing 2 and the second chassis 33 in sequence and are connected to the cylinder 4. The fixing members 5 adopt screws to connect the first bearing 2 and the second chassis 33 by screw connection. When the outer peripheral wall of the first bearing 2 is threadedly connected to the inner peripheral wall of the skirt 31, there is no need to use screws to connect the first bearing 2 and the second chassis 33. The fixing members 5 only need to pass through the second bearing 9, the second cylinder head 8, and the cylinder 4 from bottom to top and lock them on the first cylinder head 3, which facilitates the disassembly and installation between the first chassis 23 and the first cylinder head 3. The first cylinder head 3 is connected to the inner wall of the housing 6 through the skirt 31, thereby ensuring the stability of the cylinder 4.

[0044] In the present invention, when constraining the crankshaft 1, the first bearing 2, the first cylinder head 3 and the second bearing 9, the second cylinder head 8 all retain an intermediate section that is not in contact with the crankshaft 1, thereby reducing the contact area between the crankshaft 1 and the flange, reducing the wear between the crankshaft 1 and the first bearing 2, the second bearing 9, reducing the mechanical wear of the compressor, and extending the service life of the compressor; at the same time, due to the effect of the gas force in the working chamber, the crankshaft 1 close to the cylinder 4 side is in close contact with the first bearing 2, the second bearing 9, and the lubrication is not ideal. By setting the gap between the cylinder head and the crankshaft 1 on the cylinder 4 side to be larger than the gap between the bearing and the crankshaft 1 away from the cylinder 4 side, the formation of lubricating oil between the crankshaft 1 close to the cylinder 4 side and the first bearing 2, the second bearing 9 can be promoted to reduce the wear on the cylinder side of the crankshaft 1 and enhance the constraint effect of the flange on the crankshaft 1 close to the cantilever side; further, the upper end surface of the working chamber is the first cylinder The exhaust mounting seat 231 is arranged on the lower end face of the first bearing 2. The first cylinder head 3 parts constituting the end face of the working chamber are not provided with an exhaust valve seat with weak rigidity. The parts have strong rigidity, and the deformation of the end face of the working chamber is small under the locking force of the screw, which is conducive to the stable operation of the roller in the working chamber of the cylinder and avoids the wear of the end face of the working chamber. It is achieved by the axial constraint of the first bearing 2, the second bearing 9, the second cylinder head 8 and the first cylinder head 3 at the long and short axes of the crankshaft 1, retaining the middle part that does not contact the crankshaft 1, reducing the contact area between the bearing and the crankshaft 1, and reducing friction loss; at the same time, the mounting seat 231 is arranged on the lower end face of the first bearing 2, and the first cylinder head 3 constituting the end face of the working chamber operation is a solid part with uniform rigidity distribution, which reduces the deformation of the end face of the working chamber of the pump body, avoids the end face wear of the working chamber, and further reduces friction loss. In the rotary compressor, the first cylinder head 3 and the second cylinder head 8 are installed on the upper and lower sides of the cylinder, and the roller 7 is placed in the cylinder 4, together forming a working chamber for refrigerant suction and compression. The first bearing 2 and the second bearing 9 are installed on the upper and lower sides of the first cylinder head 3 and the second cylinder head 8. The crankshaft 1 is radially constrained under the action of the first bearing 2 and the second bearing 9. In order to ensure the good performance of the compressor, it is necessary to reduce the mechanical loss of the components. To this end, it is necessary to reduce the wear of the crankshaft 1 and ensure the uniformity of the deformation of the end face of the working chamber. The first bearing 2, the second bearing 9 and the cylinder head are arranged on both sides of the cylinder 4, and radial displacement constraints are performed at both ends of the long and short axes of the crankshaft 1, respectively, while ensuring the uniformity of the stiffness distribution of the parts constituting the end face of the working chamber.

[0045] The pump body assembly of the present invention includes a crankshaft 1, a first bearing 2, a first cylinder head 3, a cylinder 4, a fixing member 5, a housing 6, a roller 7, a second cylinder head 8, and a second bearing 9. The motor rotor drives the crankshaft 1 to rotate. The first bearing 2 is sleeved on the long axis of the crankshaft 1. The roller 7 is assembled on the eccentric portion of the crankshaft 1. The second bearing 9 is sleeved on the short axis of the crankshaft 1. The first cylinder head 3 and the second cylinder head 8 are respectively arranged on both sides of the cylinder 4. The fixing member 5 passes through the screw holes of the first bearing 2, the first cylinder head 3, the second bearing 9, and the second cylinder head 8, respectively, and locks onto the cylinder 4 to achieve a fixed connection of the pump body assembly. The vane, cylinder 4, and roller 7 together form a compression space. The motor rotor drives the crankshaft 1 and roller 7, and cooperates with the cylinder 4 and the vane to perform the suction and compression of the refrigerant. The constraints of the first bearing 2, the second bearing 9 and the crankshaft 1 are respectively arranged on the cylinder 4 side and the cantilever side at both ends. The middle of the first bearing 2 and the second bearing 9 is a position where the two do not contact each other, which reduces the constraint contact length of the first bearing 2, the second bearing 9 on the crankshaft 1, reduces the friction loss caused by the constraint contact between the first bearing 2, the second bearing 9 and the crankshaft, thereby improving the performance of the compressor, and the gap between the first cylinder head 3, the second cylinder head 8 and the crankshaft 1 is greater than the gap between the first neck 21, the second neck 91 and the crankshaft 1, which is beneficial to the lubrication between the crankshaft 1 close to the cylinder 4 side and the first cylinder head 3, the second cylinder head 8, thereby reducing the wear of the crankshaft 1, improving the constraint between the crankshaft 1 close to the cantilever side and the first bearing 2, the second bearing 9, and reducing the noise problem caused by insufficient constraint stiffness.

[0046] In some embodiments, the first bearing 2 includes a first neck portion 21, a first middle portion 22 and a first chassis 23. The first neck portion 21, the first middle portion 22 and the first chassis 23 all have inner holes. The crankshaft 1 passes through the inner holes of the first neck portion 21, the first middle portion 22 and the first chassis 23 in sequence. The first chassis 23 is close to the first cylinder head 3 relative to the first neck portion 21. The inner hole of the first middle portion 22 and the inner hole diameter of the first chassis 23 are the same. The inner hole diameter of the first chassis 23 is larger than the inner hole diameter of the first neck portion 21 and the inner diameter of the first cylinder head 3. Moreover, the inner hole diameter of the first neck portion 21 is not larger than the inner diameter of the first cylinder head 3. The first neck portion 21 and the first cylinder head 3 can limit the crankshaft 1. In this technical solution, a plurality of first connecting holes 24 and second connecting holes 26 are further provided on the first chassis 23, and a plurality of third connecting holes 34 and fourth connecting holes 36 are provided on the first cylinder head 3, wherein the first connecting hole 24 is opposite to the third connecting hole 34, and the second connecting hole 26 is opposite to the fourth connecting hole 36. The first connecting hole 24 and the third connecting hole 34 can be connected by screws, which pass through the first connecting hole 24 and the third connecting hole 34 in sequence and then are connected to the cylinder 4. The second connecting hole 26 and the fourth connecting hole 36 can be connected by rivets, and the fourth connecting hole 36 can be a blind hole. The inner hole of the first middle part 22 and the inner hole diameter of the first chassis 23 are the same, the inner hole diameter D2 of the first chassis 23 is larger than the inner hole diameter D1 of the first neck 21, the first neck 21 and the first cylinder head 3 have inner holes, which have a certain micron-level fit with the long axis of the crankshaft 1 respectively, and perform a restraining effect on the side of the long axis of the crankshaft 1 close to the cylinder 4 and the side close to the rotor core. The first middle part 22 does not contact the long axis of the crankshaft 1, and the fixed restraint of the long axis of the crankshaft 1 is achieved by assembling the first neck 21 and the first cylinder head 3 with the long axis of the crankshaft 1; the second neck 91 and the second cylinder head 8 have inner holes, which have a certain micron-level fit with the short axis of the crankshaft 1 respectively, and perform a restraining effect on the side of the short axis of the crankshaft 1 close to the cylinder 4 and the side away from the cylinder 4. The second middle part 92 does not contact the short axis of the crankshaft, and the fixed restraint of the short axis of the crankshaft is achieved by assembling the second neck 91 and the second cylinder head 8 with the short axis of the crankshaft 1.

[0047] In some embodiments, the inner diameter of the first neck 21 is D1, the inner diameter of the first cylinder head 3 is D3, and the outer diameter of the crankshaft 1 is D, which satisfies D1-D=10-20μm, D3-D=10-20μm. In this technical solution, the inner diameter of the first chassis 23 is D2, the inner diameter of the first neck 21 is D1, the inner diameter of the first cylinder head 3 is D3, the inner diameter of the second cylinder head 8 is D4, the inner diameter of the third chassis 93 is D5, and the inner diameter of the second neck 91 is D6. Figure 8 and Figure 9 As shown, the inner hole diameter of the third chassis 93 is the same as the inner hole diameter of the second middle part 92, and the crankshaft 1 passes through the inner hole of the first chassis 23, the inner hole of the first neck 21, the inner hole of the first cylinder head 3, the inner hole of the second cylinder head 8, the inner hole of the third chassis 93, and the inner hole of the second neck 91. D1 or D3 minus the diameter of the long axis of the crankshaft 1 is equal to X1~X2μm, where D3≥D1, so as to increase the gap between the first cylinder head 3 and the long axis of the crankshaft 1, promote lubrication effect, and reduce wear; D4 or D6 minus the diameter of the short axis of the crankshaft 1 = X1~X2μm, where D4≥D6, so as to increase the gap between the second cylinder head 8 and the short axis of the crankshaft 1, promote lubrication effect, and reduce wear; X1~X2μm is preferably 10-20μm. The distribution angles and distribution circle sizes of the first connecting hole 24, the second connecting hole 26, the fifth connecting hole 81 and the sixth connecting hole 94 on the end face are consistent, corresponding to the distribution of the screw holes on the cylinder 4, so that the fixing part 5 can pass through the screw through hole and lock on the screw hole of the cylinder 4 to realize the assembly of the pump body assembly. The fixing part 5 adopts screws.

[0048] In some embodiments, an annular groove is provided on the inner wall of the first intermediate portion 22. An oil delivery hole is provided on the crankshaft 1 along the axial direction of the crankshaft 1, and an oil outlet hole is provided on the crankshaft 1 along the radial direction of the crankshaft 1. The first neck portion 21, the first intermediate portion 22, the first cylinder head 3, and the crankshaft 1 enclose a second cavity, and the oil outlet hole is connected to the second cavity. Specifically, the annular groove extends along the circumference of the first intermediate portion 22, and multiple annular grooves are provided along the axial direction of the crankshaft 1. The annular grooves can store lubricating oil. In this technical solution, when the crankshaft 1 rotates, the lubricating oil is discharged through the oil outlet hole and enters the first cavity between the crankshaft 1 and the first bearing 2. Due to the high-speed rotation of the crankshaft 1, the lubricating oil is thrown into the annular groove of the first intermediate portion 22. When the compressor speed decreases, the lubricating oil inside the annular groove flows out, promoting sufficient lubrication of the contact points between the crankshaft and the bearing.

[0049] In some embodiments, in conjunction with Figures 10 to 12As shown, the pump body assembly further includes a second bearing 9 and a second cylinder head 8. The second bearing 9 and the second cylinder head 8 are located on the other side of the cylinder 4. The second bearing 9 and the second cylinder head 8 are sleeved on the crankshaft 1, and the second cylinder head 8 is located between the second bearing 9 and the cylinder 4. Specifically, the second bearing 9 includes a second neck portion 91, a second middle portion 92, and a third base plate 93. The second neck portion 91, the second middle portion 92, and the third base plate 93 all have inner holes. The crankshaft 1 passes through the inner holes of the second neck portion 91, the second middle portion 92, and the third base plate 93 in sequence. The inner holes of the second middle portion 92 and the third base plate 93 have the same diameter. The inner hole diameter of the third base plate 93 is larger than the inner hole diameter of the second neck portion 91 and the inner diameter of the second cylinder head 8. The inner hole of the second neck portion 91 is not larger than the inner diameter of the second cylinder head 8. The second neck portion 91 and the second cylinder head 8 can limit the crankshaft 1. In this technical solution, the second chassis is provided with a plurality of sixth connecting holes 94, and the second cylinder head 8 is provided with a plurality of fifth connecting holes 81. The fifth connecting holes 81 and the sixth connecting holes 94 are opposite each other and can be connected by screws. The screws sequentially pass through the fifth connecting holes 81 and the sixth connecting holes 94 and then connect to the cylinder 4. The first neck portion 21 and the first intermediate portion 22, as well as the second neck portion 91 and the second intermediate portion 92, can all be of an integral design or detachable, with the neck and intermediate portions being assembled by threaded connection.

[0050] The present invention also provides a compressor comprising the above-mentioned pump body assembly.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A pump assembly, characterized in that: include: A crankshaft (1), wherein a cylinder (4) is provided on the crankshaft (1); A first bearing (2), the first bearing (2) being sleeved on the crankshaft (1), and the first bearing (2) being located on one side of the cylinder (4), and a first exhaust hole (25) being provided on the first bearing (2); A first cylinder head (3), the first cylinder head (3) is located between the first bearing (2) and the cylinder (4), the first cylinder head (3) is sleeved on the crankshaft (1), the first cylinder head (3) is provided with a second exhaust hole (35), and the gas in the cylinder (4) can be discharged through the second exhaust hole (35); the end surface of the first bearing (2) facing the first cylinder head (3) is provided with a groove (232) and a mounting seat (231), the mounting seat (231) is provided with a valve plate, and the valve plate is opposite to the groove (232). The valve plate can move in the groove (232) to connect or disconnect the second exhaust hole (35) with the first exhaust hole (25).

2. The pump assembly according to claim 1, characterized in that: The first cylinder head (3) comprises a skirt (31), a connecting portion (32) and a second chassis (33), wherein the skirt (31) is arranged on the outer peripheral wall of the second chassis (33), the first bearing (2) is connected to the skirt (31), the connecting portion (32) is located on the second chassis (33), and the connecting portion (32) is located between the second chassis (33) and the first bearing (2), so that a first cavity is formed between the second chassis (33) and the first bearing (2).

3. The pump assembly according to claim 2, characterized in that: The pump assembly further comprises a housing (6), the skirt (31) is connected to the inner wall of the housing (6), the outer peripheral wall of the first bearing (2) is threadedly connected to the inner peripheral wall of the skirt (31), or a plurality of fixing members (5) are provided on the first bearing (2), and the fixing members (5) sequentially penetrate the first bearing (2) and the second chassis (33) and are then connected to the cylinder (4).

4. The pump assembly according to claim 1, characterized in that: The first bearing (2) comprises a first neck portion (21), a first middle portion (22) and a first chassis (23); the first neck portion (21), the first middle portion (22) and the first chassis (23) all have inner holes; the crankshaft (1) passes through the inner holes of the first neck portion (21), the first middle portion (22) and the first chassis (23) in sequence; the first chassis (23) is close to the first cylinder head (3) relative to the first neck portion (21); the inner hole of the first middle portion (22) and the inner hole of the first chassis (23) have the same aperture; the inner hole of the first chassis (23) has a larger aperture than the inner hole of the first neck portion (21) and the inner diameter of the first cylinder head (3); and the inner hole of the first neck portion (21) is not larger than the inner diameter of the first cylinder head (3); the first neck portion (21) and the first cylinder head (3) can limit the crankshaft (1).

5. The pump assembly according to claim 4, characterized in that: The inner hole diameter of the first neck (21) is D1, the inner diameter of the first cylinder head (3) is D3, and the outer diameter of the crankshaft (1) is D, which satisfies the following conditions: D1-D=10-20 μm, D3-D=10-20 μm.

6. The pump assembly according to claim 4, characterized in that: An annular groove is provided on the inner wall of the first middle portion (22); an oil delivery hole is provided on the crankshaft (1) along the axial direction of the crankshaft (1); an oil outlet hole is also provided on the crankshaft (1) along the radial direction of the crankshaft (1); the first neck portion (21), the first middle portion (22), the first cylinder head (3) and the crankshaft (1) enclose a second cavity, and the oil outlet hole is communicated with the second cavity.

7. The pump assembly according to claim 6, characterized in that: The annular groove extends along the circumference of the first middle portion (22) and is arranged in a plurality along the axial direction of the crankshaft (1). The annular groove can store lubricating oil.

8. The pump assembly according to claim 1, characterized in that: The pump body assembly further comprises a second bearing (9) and a second cylinder head (8), wherein the second bearing (9) and the second cylinder head (8) are located on the other side of the cylinder (4), the second bearing (9) and the second cylinder head (8) are sleeved on the crankshaft (1), and the second cylinder head (8) is located between the second bearing (9) and the cylinder (4).

9. The pump assembly according to claim 8, characterized in that: The second bearing (9) includes a second neck portion (91), a second middle portion (92) and a third chassis (93). The second neck portion (91), the second middle portion (92) and the third chassis (93) all have inner holes. The crankshaft (1) passes through the inner holes of the second neck portion (91), the second middle portion (92) and the third chassis (93) in sequence. The inner hole diameters of the second middle portion (92) and the third chassis (93) are the same. The inner hole diameter of the third chassis (93) is larger than the inner hole diameter of the second neck portion (91) and the inner diameter of the second cylinder head (8). In addition, the inner hole of the second neck portion (91) is not larger than the inner diameter of the second cylinder head (8). The second neck portion (91) and the second cylinder head (8) can limit the crankshaft (1).

10. A compressor, characterized in that: The pump body assembly comprises the pump body assembly according to any one of claims 1 to 9.

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