Pump body assembly and compressor

Abstract

The present invention provides a pump body assembly and a compressor, wherein the pump body assembly includes a cylinder, wherein one end of the cylinder is provided with a first flange and the other end is provided with a second flange; and a connecting member, wherein the connecting member is located on the outer circumference of the cylinder, the connecting member having a first end and a second end, the first end being connected to the first flange, and the second end being connected to the second flange, so that the cylinder is fixed between the first flange and the second flange. According to the present invention, it is possible to overcome the defect in the prior art that the cylinder and the bearing end cover are connected by screws, and the prestress generated by tightening the connecting screws causes the cylinder working chamber to deform axially or radially, resulting in poor compressor stability, thereby improving the performance of the compressor.

Description

Technical Field

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

[0002] In existing rotor compressors, the compressor cylinder and the bearing end cover are fastened together by screws. The prestress generated by tightening the connecting screws can cause the cylinder working chamber to deform axially or radially, resulting in the compressor getting stuck during operation or causing excessive friction losses due to wear of components. The axial deformation of the cylinder end face causes deformation of the sealing mating surface, which may cause leakage due to uneven contact stress, further affecting the performance of the compressor.

[0003] Since the compressor in the prior art has a connection between the cylinder and the bearing end cover fastened by screws, the prestress generated by tightening the connecting screws will cause the cylinder working chamber to deform axially or radially, resulting in technical problems such as jamming during the operation of the compressor. Therefore, 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 cylinder and the bearing end cover are fastened by screws, and the prestress generated by tightening the connecting screws will cause the cylinder working chamber to deform axially or radially, resulting in poor stability of the compressor, 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 cylinder, wherein one end of the cylinder is provided with a first flange and the other end is provided with a second flange;

[0007] A connecting member is located on the outer peripheral side of the cylinder, and the connecting member has a first end and a second end, the first end is connected to the first flange, and the second end is connected to the second flange, so that the cylinder is fixed between the first flange and the second flange.

[0008] In some embodiments, the pump body assembly further includes a crankshaft, the first flange, the cylinder, and the second flange are sequentially arranged on the crankshaft, and a plurality of the connecting members are provided on the outer peripheral side of the cylinder along the circumference of the cylinder.

[0009] In some embodiments, a first groove is provided on the outer peripheral wall of the first flange, a second groove is provided on the outer peripheral wall of the cylinder, and a third groove is provided on the second flange. Along the axial direction of the cylinder, the first groove passes through the first flange, the second groove passes through the cylinder, and the third groove passes through the second flange. The first groove, the second groove and the third groove are connected in sequence to form an installation groove. The connecting member is located in the installation groove, and the connecting member is interference fit with the installation groove.

[0010] In some embodiments, along the radial direction of the cylinder, the groove depth of the first groove is L1, the groove depth of the second groove is L2, and the groove depth of the third groove is L3, which satisfies L1=L2=L3, the angle between the two side walls of the first groove and the line connecting the central axis of the cylinder, the angle between the two side walls of the second groove and the line connecting the central axis of the cylinder, and the angle between the two side walls of the third groove and the line connecting the central axis of the cylinder are the same, the groove bottom surfaces of the first groove, the second groove and the third groove are all arc surfaces, and the arc surface radius of the first groove, the arc surface radius of the second groove and the arc surface radius of the third groove are the same.

[0011] In some embodiments, at least two first connection holes are provided on the first flange, and at least two first connection holes are respectively arranged on both sides of the first groove, and the first end is connected to the first flange through the first connection holes. At least two second connection holes are provided on the second flange, and at least two second connection holes are respectively arranged on both sides of the third groove, and the second end is connected to the second flange through the second connection holes.

[0012] In some embodiments, the first end is provided with at least two first communicating holes, and the first communicating holes are arranged opposite to the first connecting hole. The second end is provided with at least two second communicating holes, and the second communicating holes are arranged opposite to the second connecting hole. The first communicating holes and the first connecting holes, and the second communicating holes and the second connecting holes are connected by fixing members, so that the first end is connected to the first flange and the second end is connected to the second flange.

[0013] In some embodiments, the connecting member includes a first part, a second part and a third part, one end of the second part is connected to the first part, and the other end is connected to the third part, the first part and the third part are both perpendicular to the second part, the first part is at least partially connected to the first flange, and the third part is at least partially connected to the second flange.

[0014] In some embodiments, the pump body assembly also includes a shell, the first flange, the cylinder and the second flange are all located in the shell, a third connecting hole is provided on the shell, the third connecting hole is opposite to the first part, and the shell and the first part are welded through the third connecting hole.

[0015] In some embodiments, when the pump body assembly also includes a shell and a third connecting hole is provided on the shell, the second part is a telescopic structure, and a fourth connecting hole is provided on the outer peripheral wall of the first part, and the fourth connecting hole is opposite to the third connecting hole, and the fourth connecting hole and the third connecting hole are connected by fasteners.

[0016] The present invention also provides a compressor, which includes the pump body assembly described in any of the preceding items.

[0017] A pump body assembly and a compressor provided by the present invention have the following beneficial effects: along the axial direction of the cylinder, a first flange is provided at one end of the cylinder and a second flange is provided at the other end, and a connecting piece is located on the outer peripheral side of the cylinder, and the connecting piece has a first end and a second end, and the first end is connected to the first flange and the second end is connected to the second flange, so that a clamping force is generated between the first flange and the second flange, thereby fixing the cylinder between the first flange and the second flange, avoiding the deformation of components caused by the flanges and cylinder being assembled by screw locking with the cylinder and the first flange and the second flange, and reducing the risk of leakage in the working chamber and wear of components due to deformation; compared with the prior art, the cylinder in the pump body assembly of the present invention is not provided with a screw hole structure, the structural rigidity of the cylinder is strong, and the deformation is small, which is conducive to promoting stable operation inside the working chamber, while reducing processing difficulty and reducing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a pump assembly according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A partial enlarged view of point I in the middle;

[0020] Figure 3 is a cross-sectional view of a first flange in a pump body assembly according to an embodiment of the present invention;

[0021] Figure 4 A bottom view of the first flange in the pump body assembly according to an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the structure of the cylinder in the pump assembly according to an embodiment of the present invention;

[0023] Figure 6 A top view of a cylinder in a pump assembly according to an embodiment of the present invention;

[0024] Figure 7 is a cross-sectional view of the second flange in the pump body assembly according to an embodiment of the present invention;

[0025] Figure 8 A top view of the second flange in the pump body assembly according to an embodiment of the present invention;

[0026] Figure 9 is a cross-sectional view of a pump assembly according to an embodiment of the present invention;

[0027] Figure 10 A top view of a pump assembly according to an embodiment of the present invention;

[0028] Figure 11 Schematic diagram of the structure of the connecting member in the pump assembly according to an embodiment of the present invention;

[0029] Figure 12 A top view of a connecting member in a pump assembly according to an embodiment of the present invention;

[0030] Figure 13 Schematic diagram of the structure of the housing in the pump assembly according to an embodiment of the present invention;

[0031] Figure 14 A top view of a housing in a pump assembly according to an embodiment of the present invention;

[0032] Figure 15 This is an exploded view of the pump body assembly according to an embodiment of the present invention.

[0033] The reference numerals indicate:

[0034] 1. Crankshaft; 2. First flange; 21. First connecting hole; 22. First groove; 3. Cylinder; 31. Second groove; 4. Fixing member; 5. Connecting member; 51. First part; 52. Second part; 53. Third part; 54. First connecting hole; 55. Second connecting hole; 6. Roller; 7. Second flange; 71. Second connecting hole; 72. Third groove; 8. Housing; 81. Third connecting hole. DETAILED DESCRIPTION

[0035] See also Figures 1 to 15As shown, according to an embodiment of the present invention, a pump body assembly is provided, including: a cylinder 3, one end of the cylinder 3 is provided with a first flange 2, and the other end is provided with a second flange 7; a connecting member 5, the connecting member 5 is located on the outer peripheral side of the cylinder 3, the connecting member 5 has a first end and a second end, the first end is connected to the first flange 2, and the second end is connected to the second flange 7, so that the cylinder 3 is fixed between the first flange 2 and the second flange 7. In this technical solution, along the axial direction of the cylinder 3, a first flange 2 is provided at one end of the cylinder 3, and a second flange 7 is provided at the other end. The connecting member 5 is located on the outer peripheral side of the cylinder 3, and the connecting member 5 has a first end and a second end. The first end is connected to the first flange 2, and the second end is connected to the second flange 7, so that a clamping force is generated between the first flange 2 and the second flange, thereby fixing the cylinder between the first flange 2 and the second flange 7, avoiding the deformation of components caused by the cylinder 3 and the first flange 2 and the second flange 7 being assembled together by screws, and reducing the risk of leakage in the working chamber and wear of components due to deformation; compared with the prior art, the cylinder 3 in the pump body assembly of the present invention is not provided with a screw hole structure, the structural rigidity of the cylinder 3 is strong, and the deformation is small, which is conducive to promoting stable operation inside the working chamber, while reducing processing difficulty and reducing costs.

[0036] In some embodiments, in conjunction with Figure 1 As shown, the pump body assembly also includes a crankshaft 1, and the first flange 2, cylinder 3, and second flange 7 are sequentially arranged on the crankshaft 1. Along the circumference of the cylinder 3, a plurality of connecting members 5 are provided on the outer circumference of the cylinder 3. In this technical solution, the first flange 2, cylinder 3, and second flange 7 are sequentially arranged on the crankshaft 1. The first flange 2 and second flange 7 form an axial constraint on the cylinder 3. Along the circumference of the cylinder 3, a plurality of connecting members 5 are provided on the outer circumference of the cylinder 3. Through the connecting members 5, the first flange 2 and second flange 7 form a clamping force on the cylinder 3 along the axial direction of the cylinder 3. In addition, the connecting members 5 also have a radial limiting effect on the cylinder 3.

[0037] In some embodiments, the collection see Figure 3 and Figure 4As shown, a first groove 22 is provided on the outer peripheral wall of the first flange 2, a second groove 31 is provided on the outer peripheral wall of the cylinder 3, and a third groove 72 is provided on the second flange 7. Along the axial direction of the cylinder 3, the first groove 22 passes through the first flange 2, the second groove 31 passes through the cylinder 3, and the third groove 72 passes through the second flange 7. The first groove 22, the second groove 31 and the third groove 72 are connected in sequence to form a mounting groove. The connecting member 5 is located in the mounting groove, and the connecting member 5 is interference fit with the mounting groove. In this technical solution, along the axial direction of the first flange 2, the center lines of the first groove 22, the second groove 31 and the third groove 72 coincide with each other, and the connecting member 5 is located in the mounting groove. The assembly between the connecting member 5, the first flange 2, the cylinder 3 and the second flange 7 is realized through the mounting groove. The first groove 22 is provided on the outer peripheral wall of the first flange 2, the second groove 31 is provided on the outer peripheral wall of the cylinder 3, and the third groove 72 is provided on the second flange 7. The parts with weaker rigidity of the first flange 2 and the second flange 7 are away from the operating working chamber position of their corresponding cylinder 3. Compared with the screw hole close to the operating working chamber in the prior art, the deformation of the end face of the working chamber of the flange bearing is smaller and more uniform, which is conducive to avoiding leakage of the working chamber and end face wear. The connecting member 5 is interference fit with the mounting groove to realize radial position restriction between the first flange 2, the cylinder 3 and the second flange 7; the two axial end faces of the cylinder 3 cooperate with the first flange 2 and the second flange 7 to realize axial position restriction between the flange and the cylinder.

[0038] In some embodiments, in conjunction with Figures 3 to 8As shown, along the radial direction of the cylinder 3, the groove depth of the first groove 22 is L1, the groove depth of the second groove 31 is L2, and the groove depth of the third groove 72 is L3, which satisfies L1=L2=L3, the angle between the two side walls of the first groove 22 and the line connecting the central axis of the cylinder 3, the angle between the two side walls of the second groove 31 and the line connecting the central axis of the cylinder 3, and the angle between the two side walls of the third groove 72 and the line connecting the central axis of the cylinder 3 are the same, the groove bottom surfaces of the first groove 22, the second groove 31 and the third groove 72 are all arc surfaces, and the arc surface radius of the first groove 22, the arc surface radius of the second groove 31 and the arc surface radius of the third groove 72 are the same. In this technical solution, the radius R1 of the arc surface S1 of the first groove 22, the radius R3 of the arc surface S2 of the second groove 31 and the radius R4 of the arc surface S3 of the third groove 72 are the same in size, and the groove depth, the angle θ between the two side walls, and the groove bottom radius of the first groove 22, the second groove 31 and the third groove 72 are all the same, so that the grooves between the cylinder 3, the first flange 2 and the second flange 7 maintain a structural correspondence, thereby generating an assembly space for the connecting part 5, so that the connecting part 5 can be installed in the pump body assembly. When there are multiple connecting parts 5, correspondingly, along the circumference of the cylinder 3, there are multiple first grooves 22, the second grooves 31 and the third grooves 72, and the number of the first grooves 22, the second grooves 31 and the third grooves 72 is the same.

[0039] In some embodiments, at least two first connection holes 21 are provided on the first flange 2, and at least two first connection holes 21 are respectively arranged on both sides of the first groove 22, and the first end is connected to the first flange 2 through the first connection holes 21. At least two second connection holes 71 are provided on the second flange 7, and at least two second connection holes 71 are respectively arranged on both sides of the third groove 72, and the second end is connected to the second flange 7 through the second connection holes 71. In this technical solution, one first connecting hole 21 and one second connecting hole 71 may also be provided. The first connecting hole 21 and the second connecting hole 71 may be a through hole or a blind hole. Preferably, the number of the first connecting hole 21 and the second connecting hole 71 are both two or more. When there are multiple first grooves 22 along the circumference of the first flange 2, the number of the first connecting hole 21 and the second connecting hole 71 is twice the number of the mounting grooves. When there are two first connecting holes 21 and two second connecting holes 71 respectively, the angle between the center of the two first connecting holes 21 and the central axis of the first flange 2 and the angle α between the center of the two second connecting holes 71 and the central axis of the first flange 2 are the same. Taking the radial cross-section of the first flange 2 as the projection surface and the central axis of the first flange 2 as the center, the radius size of the distribution circle where the first connecting hole 21 is located is R2, and the radius size of the distribution circle where the second connecting hole 71 is located is R5, which satisfies R2=R5.

[0040] In some embodiments, the first end is provided with at least two first connecting holes 54, which are arranged opposite the first connecting hole 21. The second end is provided with at least two second connecting holes 55, which are arranged opposite the second connecting hole 71. The first connecting holes 54 and the first connecting hole 21, and the second connecting holes 55 and the second connecting hole 71, are connected by a fixing member 4, thereby connecting the first end to the first flange 2 and the second end to the second flange 7. In this technical solution, the fixing member 4 is a screw, and the first connecting holes 54, the first connecting hole 21, the second connecting holes 55, and the second connecting hole 71 are all threaded holes. The middle portion of the connecting member 5 limits the radial position between the flange and the cylinder. The first and second ends are screw-locked to the first flange 2 and the second flange 7, respectively, to limit the axial position between the flange and the cylinder. The screw-locked connection flange and the connecting device complete the assembly of the flange and the cylinder. This arrangement can achieve minimal deformation of the pump body working chamber and better distribution.

[0041] In some embodiments, in conjunction with Figure 11 and Figure 12As shown, the connector 5 includes a first portion 51, a second portion 52, and a third portion 53. One end of the second portion 52 is connected to the first portion 51, and the other end is connected to the third portion 53. The first portion 51 and the third portion 53 are both perpendicular to the second portion 52. The first portion 51 is at least partially connected to the first flange 2, and the third portion 53 is at least partially connected to the second flange 7. In this technical solution, the first portion 51 and the third portion 53 are both perpendicular to the second portion 52, giving the connector 5 an I-shape. The first connecting hole 54 is provided in the first portion 51, and the second connecting hole 55 is provided in the third portion 53. During installation, the second portion is located in the mounting groove and has an interference fit with the mounting groove. The connector 5 can be designed as a single piece or detachable, and is divided into an upper portion, a middle portion, and a lower portion. The first portion 51 and the third portion 53 are provided with grooves, and the second portion 52 is installed in the grooves of the first portion 51 and the third portion 53 for transfer.

[0042] See also Figure 15As shown, the pump assembly of the present invention includes a crankshaft 1, a first flange 2, a cylinder 3, a fixing member 4, a connecting member 5, a roller 6, a second flange 7, and a housing 8. The motor rotor drives the crankshaft 1 to rotate. The first flange 2 is mounted on the long axis of the crankshaft 1, the roller 6 is mounted on the eccentric portion of the crankshaft 1, and the second flange 7 is mounted on the short axis of the crankshaft 1. The first flange 2 and the second flange 7 are respectively arranged on both sides of the cylinder 3. The connecting member 5 is mounted on the first flange 2, the cylinder 3, and the second flange 7 to achieve a fixed connection between the three. The vane, the cylinder 3, and the roller 6 together form a compression space. The motor rotor drives the crankshaft 1 and the roller 6, and cooperates with the cylinder 3 and the vane to perform the suction and compression of the refrigerant. The first flange 2 includes a bearing neck and a chassis. The axial height dimension of the chassis of the first flange 2 is H1, and the radial depth of the vertical first groove 22 is L1. The angle between the left and right end faces of the vertical first groove 22 is θ, the inner circumferential surface of the vertical first groove 22 is S1, and the radius dimension of the inner circumferential surface S1 of the vertical first groove 22 is R1. The first connecting holes 21 of the first flange 2 are distributed on both sides of the circumference of the vertical first groove 22, and the number is twice that of the vertical first groove 22, of which the number of the first connecting holes 21 distributed on the same side is θ. The angle between the center of the two first connecting holes 21 on both sides of the vertical first groove 22 and the line connecting the center points is α; the radius of the distribution circle where the first connecting holes 21 are located is R2; the axial height dimension of the cylinder 3 is H2, and the cylinder 3 has vertical second grooves 31, which are evenly distributed on the outer circumference of the cylinder 3. The radial depth of the vertical second grooves 31 is L2, and the angle between the left and right end faces of the vertical second grooves 31 is also θ. The inner circumference of the vertical second groove 31 is S2, and the inner circumference of the vertical second groove 31 is The radius of surface S3 is R3; the second flange 7 includes a bearing neck and a chassis, the axial height of the chassis of the second flange 7 is H3, the vertical third grooves 72 of the second flange 7 are evenly distributed on the chassis of the second flange 7, the radial depth of the vertical third grooves 72 is L3, the angle between the left and right end faces of the vertical third grooves 72 is also θ, the inner circumferential surface of the vertical third groove 72 is S3, and the radius of the inner circumferential surface S3 of the vertical third groove 72 is R4; the second The connecting holes 71 are distributed on both sides of the circumference of the third groove 72, and their number is twice that of the vertical third grooves 72. The angle between the center and the line connecting the center points of two second connecting holes 71 distributed on both sides of the same vertical third groove 72 is also α. The radius of the distribution circle of the second connecting holes 71 is R5, and they can be through holes or blind holes. The angles a, b, c, and d between the positioning lines of the vertical grooves of the first flange 2, cylinder 3, and second flange 7 are as follows: the connecting member 5 has a first portion 51, a second portion 52, and a third portion 53.The axial height of the second part 52 of the connecting member 5 is H4, the radial dimension is L4, the angle between the left and right end faces of the second part 52 is θ', the inner circumferential surface of the second part 52 is S4, and the radius dimension of the inner circumferential surface S4 is R7; the first part 51 has a first connecting hole 54, and the third part 53 has a second connecting hole 55. The first connecting hole 54 and the second connecting hole 55 of the first part 51 and the third part 53 correspond to each other in the axial direction. On the same distribution circle on the end face, the distribution circle radius dimension is R6. The centers of the two second connecting holes 55 and the first connecting hole 54 on both sides of the same vertical second part 52 are aligned with each other. The angle between the center points is α'; the first portion 51 has an outer circumferential surface S5, and the radius of the outer circumferential surface S5 is R8; wherein, the axial height H4 of the second portion 52 = the axial height H1 of the chassis of the first flange 2 + the axial height H2 of the cylinder 3 + the axial height H3 of the chassis of the second flange 2; the radial dimension L4 of the second portion 52 = the radial dimensions L1, L2, and L3 of the vertical grooves of the first flange, cylinder, and second flange assembly A; the angle θ' between the left and right end surfaces of the second portion 52 = the angle θ between the left and right end surfaces of the vertical grooves of the first flange 2, cylinder 3, and second flange 7; for reference; Figure 9 and Figure 10 As shown, the radius R7 of the inner circumferential surface S4 of the second part 52 is equal to the radius R1, R3, and R4 of the inner circumferential surfaces S1, S2, and S3 of the vertical grooves of the first flange 2, the cylinder 3, and the second flange 7; the number of the connecting parts 5 is equal to the number n1, n2, and n3 of the vertical grooves of the first flange 2, the cylinder 3, and the second flange 7; at the same time, the angle α' between the center point of the first connecting hole 54 of the first part 51 or the second connecting hole 55 of the third part 53 distributed on both sides of the second part 52 and the center point is equal to the angle α between the center point of the connecting hole of the first flange 2 and the second flange 7; the radius R6 of the distribution circle of the first connecting hole 54 and the second connecting hole 55 of the first part 51 and the third part 53 of the connecting device is equal to the radius R2 and R5 of the distribution circle of the connecting holes of the first flange 2 and the second flange 7;

[0043] In some embodiments, in conjunction with Figure 13 and Figure 14 As shown, the pump assembly further comprises a housing 8, wherein the first flange 2, the cylinder 3 and the second flange 7 are all located in the housing 8. Figure 2As shown, the housing 8 is provided with a third communication hole 81, which is opposite to the first portion, and the housing 8 and the first portion 51 are welded together through the third communication hole 81. In this technical solution, preferably, multiple third communication holes 81 are provided on the outer peripheral wall of the housing 8 along the circumference of the housing. The angles between the third communication holes 81 are consistent with the angles between the first grooves 22 of the first flange 2. By filling the third communication holes 81 of the housing with solder, the housing 8 and the connector 5 can be connected using a welding process. Connection holes can also be provided on the outer peripheral wall of the third portion 53, and corresponding communication holes are also provided on the housing 8, so that both the first portion 51 and the third portion 53 are connected to the housing 8 to ensure the stability of the pump assembly. The housing 8 has an inner circumferential surface S6 with a radius R9, and has a plurality of third communicating holes 81 for welding the pump body assembly to the housing. The intermediate angles between the positioning lines of the respective third communicating holes 81 are a', b', c', and d'; wherein the radius R9 of the inner circumferential surface S6 of the housing 8 is equal to the radius R8 of the outer circumferential surface S5 of the first portion 51, and the angles a', b', c', and d' between the positioning lines of the respective third communicating holes 81 correspond to the angles a, b, c, and d between the positioning lines of the respective vertical grooves of the pump body assembly, respectively; the inner circumferential surface S6 of the housing 8 contacts the outer circumferential surface S5 of the first portion 51 of the connecting device, thereby realizing the positioning connection of the pump body assembly within the housing;

[0044] In some embodiments, when the pump assembly further comprises a housing 8 and the housing 8 is provided with a third communication hole 81, the second portion 52 is a telescopic structure, and a fourth connection hole is provided on the outer peripheral wall of the first portion 51, the fourth connection hole being opposite to the third communication hole 81. The fourth connection hole is connected to the third communication hole 81 by a fastener. In this technical solution, the fastener is a screw. The fourth connection hole and the third communication hole 81 can be connected by screws or welding. The second portion 52 is a telescopic structure. Preferably, the second portion 52 is composed of two sections, the first section being insertable and movable within the second section. A positioning member is embedded in the first section, and an elastic member is provided between the positioning member and the first section. The elastic member can be a spring. A limiting hole is provided in the second section. When the first and second sections are relatively telescopic, the positioning member is opposite to the limiting hole. Under the elastic force of the elastic member, the positioning member extends out of the limiting hole, thereby fixing the first and second sections. Of course, the telescopic structure of the present invention is not limited to this, and other telescopic structures that meet the telescopic and fixing requirements are also acceptable. A fourth connecting hole is provided on the outer circumferential wall of the first portion 51, opposite the third connecting hole 81. The fourth connecting hole is used for positioning, aligning the housing 8 with the first portion 51. The first and second flanges 2 and 7 are axially fixedly connected to the cylinder 3 via the connector 5. The outer circumferential surface of the first portion tightly mates with the inner circumferential surface of the housing 8, and a welded connection is established via the third connecting hole 81 in the housing 8, completing the assembly of the pump assembly within the housing 8. The radial positions of the first flange 2, the second flange 7, the vertical second groove 31 of the cylinder, the first connecting hole 21, the second connecting hole 71 and the connecting piece 5 in the pump body assembly are all arranged away from the operating working chamber position of the corresponding cylinder 3, and the deformation of the working chamber is smaller and more uniform, thereby avoiding leakage of the working chamber and end face wear; at the same time, the setting of the screw hole on the cylinder 3 is cancelled, which increases the overall structural stiffness of the cylinder 3 and reduces the deformation of the working chamber, which is beneficial to the stable operation of the roller 6 in the working chamber of the cylinder; further, the connection between the connecting piece 5 and the shell 8 realizes the assembly of the pump body assembly in the shell 8, cancels the setting of the skirt of the first flange 2, reduces the overall weight and processing difficulty of the pump body assembly, and reduces costs.

[0045] The present invention also provides a compressor comprising the above-mentioned pump body assembly.

[0046] 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 cylinder (3), wherein one end of the cylinder (3) is provided with a first flange (2) and the other end is provided with a second flange (7); a connecting member (5), the connecting member (5) being located on the outer peripheral side of the cylinder (3), the connecting member (5) having a first end and a second end, the first end being connected to the first flange (2), and the second end being connected to the second flange (7), so that the cylinder (3) is fixed between the first flange (2) and the second flange (7); The pump body assembly further comprises a crankshaft (1), the first flange (2), the cylinder (3) and the second flange (7) being sequentially arranged on the crankshaft (1), and a plurality of the connecting members (5) being arranged on the outer peripheral side of the cylinder (3) along the circumference of the cylinder (3).

2. The pump assembly according to claim 1, characterized in that: A first groove (22) is provided on the outer peripheral wall of the first flange (2), a second groove (31) is provided on the outer peripheral wall of the cylinder (3), and a third groove (72) is provided on the second flange (7). Along the axial direction of the cylinder (3), the first groove (22) passes through the first flange (2), the second groove (31) passes through the cylinder (3), and the third groove (72) passes through the second flange (7). The first groove (22), the second groove (31) and the third groove (72) are connected in sequence to form a mounting groove. The connecting member (5) is located in the mounting groove, and the connecting member (5) is interference-fitted with the mounting groove.

3. The pump assembly according to claim 2, characterized in that: Along the radial direction of the cylinder (3), the groove depth of the first groove (22) is L1, the groove depth of the second groove (31) is L2, and the groove depth of the third groove (72) is L3, which satisfies the following: L1=L2=L3; the angle between the two side walls of the first groove (22) and the line connecting the central axis of the cylinder (3), the angle between the two side walls of the second groove (31) and the line connecting the central axis of the cylinder (3), and the angle between the two side walls of the third groove (72) and the line connecting the central axis of the cylinder (3) are the same; the bottom surfaces of the first groove (22), the second groove (31), and the third groove (72) are all arc surfaces; the arc radius of the first groove (22), the arc radius of the second groove (31), and the arc radius of the third groove (72) are the same.

4. The pump assembly according to claim 2, characterized in that: At least two first connecting holes (21) are provided on the first flange (2), and the at least two first connecting holes (21) are respectively arranged on both sides of the first groove (22), and the first end is connected to the first flange (2) through the first connecting holes (21). At least two second connecting holes (71) are provided on the second flange (7), and the at least two second connecting holes (71) are respectively arranged on both sides of the third groove (72), and the second end is connected to the second flange (7) through the second connecting holes (71).

5. The pump assembly according to claim 4, characterized in that: The first end is provided with at least two first communicating holes (54), the first communicating holes (54) being arranged opposite to the first connecting hole (21), the second end is provided with at least two second communicating holes (55), the second communicating holes (55) being arranged opposite to the second connecting hole (71), the first communicating holes (54) and the first connecting hole (21), and the second communicating holes (55) and the second connecting hole (71) being connected via a fixing member (4), so that the first end is connected to the first flange (2), and the second end is connected to the second flange (7).

6. The pump assembly according to claim 1, characterized in that: The connecting member (5) comprises a first part (51), a second part (52) and a third part (53); one end of the second part (52) is connected to the first part (51), and the other end is connected to the third part (53); the first part (51) and the third part (53) are both perpendicular to the second part (52); the first part (51) is at least partially connected to the first flange (2), and the third part (53) is at least partially connected to the second flange (7).

7. The pump assembly according to claim 6, characterized in that: The pump body assembly further comprises a housing (8), wherein the first flange (2), the cylinder (3) and the second flange (7) are all located in the housing (8), and a third communicating hole (81) is provided on the housing (8), wherein the third communicating hole (81) is opposite to the first part, and the housing (8) and the first part (51) are welded via the third communicating hole (81).

8. The pump assembly according to claim 6, characterized in that: When the pump body assembly further includes a housing (8) and a third connecting hole (81) is provided on the housing (8), the second part (52) is a telescopic structure, and a fourth connecting hole is provided on the outer peripheral wall of the first part (51), the fourth connecting hole is opposite to the third connecting hole (81), and the fourth connecting hole and the third connecting hole (81) are connected by a fastener.

9. A compressor, characterized in that: The pump body assembly comprises the pump body assembly according to any one of claims 1 to 8.

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