Pump components, fluid machinery and heat exchange equipment

Abstract

The present invention provides a pump body assembly, a fluid machinery and a heat exchange device. The pump body assembly includes a cylinder sleeve, a cylinder and a piston. The cylinder is rotatably arranged in the cylinder sleeve, and the piston is slidably arranged in the cylinder. The pump body assembly also includes: a rotating shaft, including a long shaft section and a matching section connected to the long shaft section. The matching section is inserted into the piston to drive the piston to move. The outer surface of the matching section has two first matching planes arranged in parallel. The first matching planes are in contact with the piston so that the rotating shaft drives the piston to move; each first matching plane has a width W, and the outer diameter D of the long shaft section and the width W satisfy that the central axis of the rotating shaft and the central axis of the cylinder are arranged parallel to each other and have a preset distance; the width direction of the first matching plane is perpendicular to the direction of the central axis of the rotating shaft. The present invention solves the problem in the prior art that the normal operation of the rotary cylinder piston compressor is affected by the poor operating reliability of the rotary cylinder piston compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of pump body components, and in particular to a pump body component, a fluid machine and a heat exchange device. Background Art

[0002] At present, the rotary cylinder piston compressor is a compressor of a completely new structure. In essence, it adopts a cross slider structure principle, combines the main structure of the piston compressor with the main structure of the rotor compressor, and is a compressor obtained. The existing rotary cylinder piston compressor includes a rotating shaft, a piston sleeved outside the rotating shaft, and a cylinder sleeved outside the piston. When the rotating shaft rotates, it drives the piston to perform circular motion. The distance between the piston and the center of the cylinder runs in the range of 0 to e. The rotating shaft and the cylinder are eccentrically assembled. The rotating shaft drives the cylinder to rotate through the piston. Due to the eccentric relationship between the rotating shaft and the cylinder, during operation, the rotating shaft and the cylinder rotate around their respective axes respectively. Relative to the cylinder, the piston performs reciprocating motion to achieve gas compression.

[0003] However, in the prior art, the contact performance between the rotating shaft and the piston during the rotation process is poor, resulting in poor reliability of the rotary cylinder piston compressor and affecting the normal operation of the rotary cylinder piston compressor. Summary of the invention

[0004] The main purpose of the present invention is to provide a pump body assembly, a fluid machine and a heat exchange device to solve the problem in the prior art that the normal operation of the rotary cylinder piston compressor is affected by the poor operating reliability of the rotary cylinder piston compressor.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a pump body assembly is provided, including a cylinder sleeve, a cylinder and a piston, wherein the cylinder is rotatably arranged in the cylinder sleeve, and the piston is slidably arranged in the cylinder. The pump body assembly also includes: a rotating shaft, including a long shaft section and a matching section connected to the long shaft section, the matching section is penetrated in the piston to drive the piston to move, and the outer surface of the matching section has two first matching planes arranged in parallel, and the first matching planes are in contact with the piston so that the rotating shaft drives the piston to move; wherein each first matching plane has a width W, and the outer diameter D of the long shaft section satisfies the width W. The central axis of the rotating shaft and the central axis of the cylinder are arranged parallel to each other and have a preset distance; wherein the width direction of the first matching plane is a direction perpendicular to the central axis of the rotating shaft.

[0006] Furthermore, the piston has a mounting hole for the mating section to pass through, and the minimum distance between the hole wall of the mounting hole and the outer surface of the piston is D min Among them, D min ≥2mm.

[0007] Furthermore, the mating section is a columnar structure, and the outer peripheral surface of the columnar structure includes two first mating planes and two arcuate surfaces, and the two first mating planes are connected by the two arcuate surfaces; wherein the arcuate surface is coaxially arranged with the rotating shaft.

[0008] Furthermore, the rotating shaft also includes a short axis segment, which is connected to the long axis segment through a mating segment, and the first end of the columnar structure has a first step; along the direction from the short axis segment to the mating segment, the cross-sectional area of ​​the first step increases, and the second end of the columnar structure has a second step, and along the direction from the long axis segment to the mating segment, the cross-sectional area of ​​the second step increases; wherein, the cross-sectional area of ​​the first step and the cross-sectional area of ​​the second step are both arranged perpendicular to the central axis of the rotating shaft.

[0009] Furthermore, the mating section includes: a columnar structure, the outer peripheral surface of the columnar structure includes two second mating planes and two first curved surfaces, and the two second mating planes are connected by the two first curved surfaces; an arc-shaped plate, arranged on the first arc-shaped surface, the outer peripheral surface of the arc-shaped plate includes two second curved surfaces and two side walls, the two second curved surfaces are connected by two side walls, and the side walls are connected to the second mating plane to form the first mating plane.

[0010] Furthermore, there are two arc-shaped plates, and the two arc-shaped plates are arranged in one-to-one correspondence with the two first arc-shaped surfaces, and each arc-shaped plate is coaxially arranged with the first arc-shaped surface.

[0011] Furthermore, along the extension direction of the rotating shaft, the length of the arc plate is smaller than the length of the columnar structure, a first step is formed between the first end surface of the arc plate and the first end surface of the columnar structure, and a second step is formed between the second end surface of the arc plate and the second end surface of the columnar structure.

[0012] Furthermore, the matching section is a prism structure, and two surfaces of the prism structure that are arranged parallel to each other are two first matching planes.

[0013] Furthermore, the pump body assembly also includes an upper flange, the long axis section is inserted into the upper flange, the cylinder has a first extension portion extending toward the upper flange, and the pump body assembly also includes: an upper limit plate, which is arranged between the upper flange and the cylinder sleeve, the first extension portion extends into the upper limit plate, and the upper limit plate and the first extension portion limit stop to prevent the cylinder from radially displacing relative to the upper limit plate.

[0014] Furthermore, the rotating shaft also includes a short shaft section, which is connected to the long shaft section through a mating section. The pump body assembly also includes a lower flange, and the short shaft section is inserted into the lower flange. The cylinder has a second extension portion extending toward the lower flange. The pump body assembly also includes: a lower limit plate, which is arranged between the lower flange and the cylinder sleeve, and the second extension portion extends into the lower limit plate. The lower limit plate and the second extension portion limit stops to prevent the cylinder from radially displacing relative to the lower limit plate.

[0015] Furthermore, the mounting hole has a third matching plane matching with the first matching plane, and the third matching plane and / or the first matching plane has a lubricating oil path for the lubricating fluid to flow.

[0016] According to another aspect of the present invention, a fluid machine is provided, comprising the above-mentioned pump body assembly.

[0017] According to another aspect of the present invention, a heat exchange device is provided, comprising the above-mentioned fluid machinery.

[0018] By applying the technical solution of the present invention, the rotating shaft rotates around its central axis, the matching section of the rotating shaft drives the piston to move, and the piston drives the cylinder to rotate around the central axis of the cylinder, so that the piston reciprocates relative to the cylinder and the rotating shaft at the same time, thereby realizing the suction, compression and exhaust actions of the pump body assembly. In this way, during the operation of the pump body assembly, the first matching plane contacts the piston so that the rotating shaft drives the piston to move, and the width W of each first matching plane satisfies the outer diameter D of the long shaft segment. This ensures good contact between the rotating shaft and the piston, increases the contact area between the rotating shaft and the piston, ensures that the rotating shaft can drive the piston to move, and the piston can slide relative to the rotating shaft, thereby solving the problem of poor operating reliability of the rotary cylinder piston compressor in the prior art, which affects the normal operation of the rotary cylinder piston compressor, and improves the operating reliability and stability of the pump body assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 An exploded view of a first embodiment of a pump assembly according to the present invention is shown;

[0021] Figure 2 Shows Figure 1 A cross-sectional view of a pump assembly in FIG.

[0022] Figure 3 Shows Figure 1 A schematic diagram of the three-dimensional structure of the rotating shaft of the pump assembly;

[0023] Figure 4 Shows Figure 1 A cross-sectional view of the pump assembly after the shaft and piston are assembled;

[0024] Figure 5 Shows Figure 1 a cross-sectional view of a cylinder of a pump assembly in FIG. 1 ; and

[0025] Figure 6 Shows Figure 5 Top view of the cylinder in FIG.

[0026] The above drawings include the following reference numerals:

[0027] 10. Cylinder liner; 20. Cylinder; 21. First extension portion; 22. Second extension portion; 30. Piston; 31. Mounting hole; 40. Rotating shaft; 41. Fitting section; 411. First fitting plane; 4111. Lubricating oil circuit; 412. First stage; 413. Second stage; 42. Long axis section; 43. Short axis section; 44. Axial oil inlet channel; 50. Upper flange; 60. Lower flange; 70. Upper limit plate; 80. Lower limit plate. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0030] In the present invention, unless otherwise specified, the directional words used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0031] In order to solve the problem in the prior art that the normal operation of the rotary cylinder piston compressor is affected by the poor operating reliability of the rotary cylinder piston compressor, the present application provides a pump body assembly, a fluid machinery and a heat exchange device.

[0032] Embodiment 1

[0033] like Figures 1 to 3 As shown, the pump body assembly includes a cylinder sleeve 10, a cylinder 20 and a piston 30. The cylinder 20 is rotatably disposed in the cylinder sleeve 10, and the piston 30 is slidably disposed in the cylinder 20. The pump body assembly also includes a rotating shaft 40. The rotating shaft 40 includes a long shaft section 42 and a matching section 41 connected to the long shaft section 42. The matching section 41 is inserted into the piston 30 to drive the piston 30 to move. The outer surface of the matching section 41 has two first matching planes 411 arranged in parallel. The first matching planes 411 are in contact with the piston 30 so that the rotating shaft 40 drives the piston 30 to move. Each first matching plane 411 has a width W, and the outer diameter D of the long shaft section 42 meets the width W. The central axis of the rotating shaft 40 and the central axis of the cylinder 20 are arranged parallel to each other and have a preset distance. The width direction of the first matching plane 411 is a direction perpendicular to the central axis of the rotating shaft 40 .

[0034] By applying the technical solution of this embodiment, the rotating shaft 40 rotates around its central axis, the matching section 41 of the rotating shaft 40 drives the piston 30 to move, and the piston 30 drives the cylinder 20 to rotate around the central axis of the cylinder 20, so that the piston 30 reciprocates relative to the cylinder 20 and the rotating shaft 40 at the same time, thereby realizing the suction, compression and exhaust actions of the pump body assembly. In this way, during the operation of the pump body assembly, the first matching plane 411 contacts the piston 30, so that the rotating shaft 40 drives the piston 30 to move, and the width W of each first matching plane 411 satisfies the outer diameter D of the long shaft section 42. This ensures good contact between the rotating shaft 40 and the piston 30, increases the contact area between the rotating shaft 40 and the piston 30, ensures that the rotating shaft 40 can drive the piston 30 to move, and the piston 30 can slide relative to the rotating shaft 40, thereby solving the problem of poor operating reliability of the rotary cylinder piston compressor in the prior art, which affects the normal operation of the rotary cylinder piston compressor, and improves the operating reliability and stability of the pump body assembly.

[0035] In this embodiment, the above-mentioned dimensional relationship between the width W of the first mating plane 411 and the outer diameter D of the long axis section 42 can reduce the contact stress between the first mating plane 411 and the piston 30, reduce the wear of the mating section 41 and the piston 30, and thereby extend the service life of the pump body assembly.

[0036] like Figure 1 and Figure 2 As shown, the cylinder sleeve 10 is sleeved outside the cylinder 20 and has an installation cavity for installing the cylinder 20, and the cylinder 20 rotates around its central axis in the installation cavity. In this way, during the rotation of the rotating shaft 40, the matching section 41 drives the piston 30 to move, so that the piston 30 reciprocates relative to the cylinder 20, and the piston 30 drives the cylinder 20 to rotate relative to the cylinder sleeve 10.

[0037] like Figure 4 As shown, the piston 30 has a mounting hole 31 for the fitting section 41 to pass through, and the minimum distance between the hole wall of the mounting hole 31 and the outer surface of the piston 30 is D min Among them, D min Thus, the above arrangement improves the structural strength of the piston 30, prevents the piston 30 from being damaged and affecting the normal operation of the pump assembly, and prolongs the service life of the pump assembly.

[0038] like Figure 3As shown, the mating section 41 is a columnar structure, and the outer peripheral surface of the columnar structure includes two first mating planes 411 and two arcuate surfaces, and the two first mating planes 411 are connected by the two arcuate surfaces. Among them, the arcuate surface is coaxially arranged with the rotating shaft 40. In this way, the above arrangement makes the structure of the mating section 41 simple, easy to process and realize, and reduces the processing cost of the mating section 41. At the same time, the above positional relationship between the mating section 41 and the rotating shaft 40 makes the rotating shaft 40 drive the movement of the piston 30 more stable, reducing the vibration and noise generated during the operation of the pump body assembly.

[0039] In this embodiment, the columnar structure is formed by cutting. Specifically, the staff cuts the cylindrical structure to form two first mating planes 411, and the structure retained after cutting is a columnar structure, which makes the processing of the mating section 41 easier and simpler, and reduces the processing cost of the mating section 41.

[0040] like Figure 3 As shown, the rotating shaft 40 also includes a short shaft section 43, which is connected to the long shaft section 42 through the matching section 41, and the first end of the columnar structure has a first step 412. In the direction from the short shaft section 43 to the matching section 41, the cross-sectional area of ​​the first step 412 increases, and the second end of the columnar structure has a second step 413, and the cross-sectional area of ​​the second step 413 increases in the direction from the long shaft section 42 to the matching section 41. Among them, the cross-sectional area of ​​the first step 412 and the cross-sectional area of ​​the second step 413 are both arranged perpendicular to the central axis of the rotating shaft 40. In this way, the above arrangement realizes the design of widening the middle of the matching section 41, and on the basis of increasing the contact area between the first matching plane 411 and the piston 30, it avoids the matching section 41 and other structures in the pump body assembly from having structural interference and affecting the normal operation of the pump body assembly.

[0041] In this embodiment, the outer diameters of the major axis section 42 and the minor axis section 43 are different.

[0042] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the pump body assembly also includes an upper flange 50, the long shaft section 42 is inserted into the upper flange 50, the cylinder 20 has a first extension portion 21 extending toward the upper flange 50, and the pump body assembly also includes an upper limit plate 70. The upper limit plate 70 is arranged between the upper flange 50 and the cylinder sleeve 10, the first extension portion 21 extends into the upper limit plate 70, and the upper limit plate 70 and the first extension portion 21 are limited and stopped to prevent the cylinder 20 from being displaced in the radial direction relative to the upper limit plate 70. In this way, the upper limit plate 70 can support the cylinder 20, prevent the cylinder 20 from being displaced in the radial direction, ensure that the cylinder 20 always rotates around its central axis, and ensure that the pump body assembly can achieve normal suction, compression and exhaust actions.

[0043] Specifically, the upper flange 50 is fixedly connected to the cylinder sleeve 10, and the upper limit plate 70 is connected to the upper flange 50 by fasteners. The upper limit plate 70 has a first through hole for the first extension portion 21 to extend into, and the first extension portion 21 extends into the first through hole and stops with the inner wall of the first through hole, thereby realizing the upper limit plate 70 limiting the cylinder 20.

[0044] In this embodiment, the first extension portion 21 is a circular ring structure, and the circular ring structure is coaxially arranged with the cylinder 20. It should be noted that the structure of the first extension portion 21 is not limited thereto. Optionally, the first extension portion 21 is a plurality of circular arcs, and each circular arc is coaxially arranged with the cylinder 20.

[0045] like Figure 1 , Figure 2 and Figure 5 As shown, the rotating shaft 40 also includes a short shaft section 43, and the short shaft section 43 is connected to the long shaft section 42 through the matching section 41. The pump body assembly also includes a lower flange 60, and the short shaft section 43 is inserted into the lower flange 60. The cylinder 20 has a second extension portion 22 extending toward the lower flange 60, and the pump body assembly also includes a lower limit plate 80. Among them, the lower limit plate 80 is arranged between the lower flange 60 and the cylinder sleeve 10, and the second extension portion 22 extends into the lower limit plate 80. The lower limit plate 80 and the second extension portion 22 limit the stop to prevent the cylinder 20 from being displaced in the radial direction relative to the lower limit plate 80. In this way, the lower limit plate 80 can support the cylinder 20, prevent the cylinder 20 from being displaced in the radial direction, ensure that the cylinder 20 always rotates around its central axis, and ensure that the pump body assembly can achieve normal suction, compression and exhaust actions.

[0046] Specifically, the lower flange 60 is fixedly connected to the cylinder sleeve 10, and the lower limit plate 80 is connected to the lower flange 60 by fasteners. The lower limit plate 80 has a second through hole for the second extension portion 22 to extend into, and the second extension portion 22 extends into the second through hole and stops with the inner wall of the second through hole, thereby realizing the lower limit plate 80 limiting the cylinder 20.

[0047] like Figure 1 As shown, the mounting hole 31 has a third mating plane that matches the first mating plane 411, and the first mating plane 411 has a lubricating oil path 4111 for lubricating fluid to circulate. Specifically, the lubricating oil path 4111 is arranged at the edge of the first mating plane 411, and the rotating shaft 40 has an axial oil inlet channel 44, which is connected to the lubricating oil path 4111, so that the lubricating oil outside the pump body assembly enters the lubricating oil path 4111 through the axial oil inlet channel 44, so as to fully supply oil between the first mating plane 411 and the third mating plane, reduce the friction between the two, avoid the increase of stress between the two, and further reduce the structural wear of the rotating shaft 40 and the piston 30.

[0048] It should be noted that the arrangement of the lubricating oil passage 4111 is not limited thereto. Optionally, the lubricating oil passage 4111 extends in a direction perpendicular to the central axis of the rotating shaft 40 .

[0049] It should be noted that the location of the lubricating oil passage 4111 is not limited thereto. In other embodiments not shown in the drawings, the lubricating oil passage is disposed on the third mating plane.

[0050] Specifically, the working principle of the pump assembly is as follows:

[0051] A variable volume chamber is formed between the cylinder 20 and the piston 30. The cylinder 20 and the rotating shaft 40 rotate around their respective central axes, and the piston 30 reciprocates simultaneously relative to the cylinder 20 and the rotating shaft 40. The reciprocating motion of the piston 30 relative to the cylinder 20 realizes the periodic enlargement and reduction of the variable volume chamber. The cylinder 20 rotates relative to the cylinder sleeve 10, realizing the communication between the variable volume chamber and the suction channel or the exhaust channel respectively. The above two composite motions realize the suction, compression and exhaust process of the pump body assembly.

[0052] The present application also provides a fluid machine (not shown), comprising the above-mentioned pump body assembly. Optionally, the fluid machine is a compressor.

[0053] The present application also provides a heat exchange device (not shown), comprising the above-mentioned fluid machinery. Optionally, the heat exchange device is an air conditioner.

[0054] Embodiment 2

[0055] The difference between the pump body assembly in the second embodiment and the first embodiment is that the structure of the matching section 41 is different.

[0056] In this embodiment, the mating section includes a columnar structure and an arc-shaped plate. The outer peripheral surface of the columnar structure includes two second mating planes and two first arc-shaped surfaces, and the two second mating planes are connected by two first arc-shaped surfaces. The arc-shaped plate is arranged on the first arc-shaped surface, and the outer peripheral surface of the arc-shaped plate includes two second arc-shaped surfaces and two side walls, and the two second arc-shaped surfaces are connected by two side walls, and the side walls are connected to the second mating planes to form the first mating planes. In this way, the above arrangement makes the structure of the mating section simple, easy to process and realize, and reduces the processing cost of the mating section.

[0057] Specifically, the arc plate is welded to the first arc surface, and the side wall and the second mating plane are located in the same plane. Each side wall is docked with the corresponding second mating plane to form a first mating plane, thereby increasing the contact area between the piston and the first mating plane and improving the connection stability and reliability between the mating section and the piston.

[0058] In this embodiment, there are two arc plates, and the two arc plates are arranged in one-to-one correspondence with the two first arc surfaces, and each arc plate is arranged coaxially with the first arc surface. In this way, the two arc plates are respectively located on both sides of the columnar structure, and each arc plate is welded to the first arc surface arranged corresponding to it, and is arranged coaxially with the first arc surface, thereby making the fitting effect of the arc plate and the first arc surface better.

[0059] In this embodiment, along the extension direction of the rotating shaft, the length of the arc plate is less than the length of the columnar structure, a first step is formed between the first end surface of the arc plate and the first end surface of the columnar structure, and a second step is formed between the second end surface of the arc plate and the second end surface of the columnar structure. In this way, the above arrangement realizes the design of widening the middle of the matching section, and on the basis of increasing the contact area between the first matching plane and the piston, avoids the matching section from having structural interference with other structures in the pump body assembly to affect the normal operation of the pump body assembly.

[0060] Embodiment 3

[0061] The difference between the pump body assembly in the third embodiment and the first embodiment is that the structure of the matching section 41 is different.

[0062] In this embodiment, the matching section is a prism structure, and two surfaces of the prism structure arranged parallel to each other are two first matching planes. Thus, the above arrangement makes the matching section simple in structure, easy to process and realize, and reduces the processing cost of the matching section.

[0063] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0064] The rotating shaft rotates around its central axis, the matching section of the rotating shaft drives the piston to move, and the piston drives the cylinder to rotate around the central axis of the cylinder, so that the piston reciprocates relative to the cylinder and the rotating shaft at the same time, thereby realizing the suction, compression and exhaust actions of the pump body assembly. In this way, during the operation of the pump body assembly, the first matching plane contacts the piston so that the rotating shaft drives the piston to move, and the width W of each first matching plane meets the outer diameter D of the long shaft segment. This ensures good contact between the rotating shaft and the piston, increases the contact area between the rotating shaft and the piston, ensures that the rotating shaft can drive the piston to move, and the piston can slide relative to the rotating shaft, thereby solving the problem of poor operating reliability of the rotary cylinder piston compressor in the prior art, which affects the normal operation of the rotary cylinder piston compressor, and improves the operating reliability and stability of the pump body assembly.

[0065] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0067] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pump assembly, comprising a cylinder sleeve (10), a cylinder (20) and a piston (30), wherein the cylinder (20) is rotatably disposed in the cylinder sleeve (10), and the piston (30) is slidably disposed in the cylinder (20), characterized in that: The pump assembly also includes: A rotating shaft (40) comprises a long shaft section (42) and a matching section (41) connected to the long shaft section (42), wherein the matching section (41) is inserted into the piston (30) to drive the piston (30) to move, and an outer surface of the matching section (41) has two first matching planes (411) arranged in parallel, wherein the first matching planes (411) are in contact with the piston (30), so that the rotating shaft (40) drives the piston (30) to move; Wherein, each of the first mating planes (411) has a width W, and the outer diameter D of the long axis segment (42) and the width W satisfy The central axis of the rotating shaft (40) and the central axis of the cylinder (20) are arranged parallel to each other and have a preset distance; wherein the width direction of the first matching plane (411) is perpendicular to the central axis of the rotating shaft (40).

2. The pump assembly according to claim 1, characterized in that: The piston (30) has a mounting hole (31) for the matching section (41) to penetrate, and the minimum distance between the hole wall of the mounting hole (31) and the outer surface of the piston (30) is D min ; Among them, D min ≥2mm.

3. The pump assembly according to claim 1, characterized in that: The mating section (41) is a columnar structure, and the outer peripheral surface of the columnar structure includes two of the first mating planes (411) and two arcuate surfaces, and the two first mating planes (411) are connected by the two arcuate surfaces; wherein the arcuate surface is coaxially arranged with the rotating shaft (40).

4. The pump assembly according to claim 3, characterized in that: The rotating shaft (40) further comprises a short shaft section (43), wherein the short shaft section (43) is connected to the long shaft section (42) via the matching section (41); the first end of the columnar structure comprises a first step (412); the cross-sectional area of ​​the first step (412) increases along the direction from the short shaft section (43) to the matching section (41); the second end of the columnar structure comprises a second step (413); the cross-sectional area of ​​the second step (413) increases along the direction from the long shaft section (42) to the matching section (41); wherein the cross-sectional areas of the first step (412) and the second step (413) are both arranged perpendicular to the central axis of the rotating shaft (40).

5. The pump assembly according to claim 1, characterized in that: The matching section (41) comprises: A columnar structure, wherein the outer peripheral surface of the columnar structure comprises two second matching planes and two first arcuate surfaces, and the two second matching planes are connected by two first arcuate surfaces; An arc-shaped plate is arranged on the first arc-shaped surface, and the outer peripheral surface of the arc-shaped plate includes two second arc-shaped surfaces and two side walls, the two second arc-shaped surfaces are connected by the two side walls, and the side walls are connected to the second matching plane to form the first matching plane (411).

6. The pump assembly according to claim 5, characterized in that: There are two arc-shaped plates, and the two arc-shaped plates are arranged in one-to-one correspondence with the two first arc-shaped surfaces, and each arc-shaped plate is coaxially arranged with the first arc-shaped surface.

7. The pump assembly according to claim 5, characterized in that: Along the extension direction of the rotating shaft (40), the length of the arc plate is smaller than the length of the columnar structure, a first step is formed between the first end surface of the arc plate and the first end surface of the columnar structure, and a second step is formed between the second end surface of the arc plate and the second end surface of the columnar structure.

8. The pump assembly according to claim 1, characterized in that: The matching section (41) is a prism structure, and two surfaces of the prism structure that are arranged parallel to each other are the two first matching planes (411).

9. The pump assembly according to claim 1, characterized in that: The pump body assembly further comprises an upper flange (50), the long shaft section (42) is inserted into the upper flange (50), the cylinder (20) has a first extension portion (21) extending toward the upper flange (50), and the pump body assembly further comprises: An upper limit plate (70) is arranged between the upper flange (50) and the cylinder sleeve (10), the first extension portion (21) extends into the upper limit plate (70), and the upper limit plate (70) and the first extension portion (21) are limited stops to prevent the cylinder (20) from being displaced in a radial direction relative to the upper limit plate (70).

10. The pump assembly according to claim 1, characterized in that: The rotating shaft (40) further comprises a short shaft section (43), wherein the short shaft section (43) is connected to the long shaft section (42) via the matching section (41); the pump body assembly further comprises a lower flange (60), wherein the short shaft section (43) is inserted into the lower flange (60); the cylinder (20) comprises a second extension portion (22) extending toward the lower flange (60); and the pump body assembly further comprises: A lower limit plate (80) is arranged between the lower flange (60) and the cylinder sleeve (10), the second extension portion (22) extends into the lower limit plate (80), and the lower limit plate (80) and the second extension portion (22) are limited and stopped to prevent the cylinder (20) from being displaced in a radial direction relative to the lower limit plate (80).

11. The pump assembly according to claim 2, characterized in that: The mounting hole (31) has a third matching plane matching with the first matching plane (411), and the third matching plane and / or the first matching plane (411) has a lubricating oil path (4111) for the lubricating fluid to flow.

12. A fluid machine, characterized in that: A pump body assembly comprising any one of claims 1 to 11.

13. A heat exchange device, characterized in that: Including the fluid machinery as claimed in claim 12.

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