Pump body assembly, rotary cylinder pump, and heat exchange apparatus

Abstract

A pump body assembly, a rotary cylinder pump, and a heat exchange apparatus. The pump body assembly comprises a rotary shaft, a cylinder liner and a piston assembly, wherein the rotary shaft and the cylinder liner are eccentrically arranged with a fixed eccentric distance; the piston assembly has a variable volume cavity, the piston assembly is rotatably arranged in the cylinder liner, and the rotary shaft is in driving connection with the piston assembly; the cylinder liner is provided with a liquid suction port and a liquid discharge port; and the cylinder liner is also provided with a buffer groove, the cylinder liner has a liquid suction slot in an inner wall surface thereof, the liquid suction slot is in communication with the liquid suction port via the buffer groove, the buffer groove extends in the circumferential direction of the cylinder liner by a first preset distance to form a buffer groove having an arc-shaped cross section, and the liquid suction slot extends in the circumferential direction of the inner wall surface of the cylinder liner by a second preset distance to form a cross section having two opposite straight segments and arc segments connecting ends of the two straight segments, such that an obtuse angle C or a round angle D is formed at the intersection between the liquid suction slot and the buffer groove, which solves the problem in the prior art of a sharp angle or edge existing at the intersection between an inlet buffer groove and a liquid suction slot of a cylinder liner.

Description

Pump body components, rotary pumps and heat exchange equipment

[0001] This disclosure claims priority to the Chinese patent application filed with the China Patent Office on December 20, 2023, with application number 202311770587.X and invention name “Pump body assembly, rotary cylinder pump and heat exchange equipment”, the entire contents of which are incorporated by reference in this disclosure. Technical Field

[0002] The present disclosure relates to the technical field of heat exchange systems, and in particular to a pump body assembly, a rotary cylinder pump, and a heat exchange device. Background Art

[0003] In data centers, computer room air conditioning and other fields, liquid pumps are usually used instead of compressors to drive the refrigerant to run in the air-conditioning system, and the energy efficiency is higher than that of conventional air-conditioning systems. In the industry, this system that uses a pump to drive the refrigerant is called a fluorine pump system, and the pump that drives the refrigerant is called a fluorine pump.

[0004] However, the existing fluorine pump has sharp corners or edges at the intersection of the inlet buffer groove and the liquid suction groove of the cylinder sleeve. Such sharp edges are prone to burrs and flanging after processing, and the wall surface of the edge is weak, which is easy to fall off and form impurities during long-term use. These defects are called "unresolved solutions to the sharp angles of the intersection line."

[0005] Summary of the Invention

[0006] The main purpose of the present disclosure is to provide a pump body assembly, a rotary cylinder pump and a heat exchange device to solve the problem of sharp corners or sharp edges at the intersection of the inlet buffer groove and the suction groove of the cylinder liner in the related art.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present disclosure, a pump body assembly is provided, comprising a rotating shaft, a cylinder sleeve and a piston assembly, wherein the rotating shaft and the cylinder sleeve are eccentrically arranged and the eccentric distance is fixed; the piston assembly has a variable volume chamber, the piston assembly is rotatably arranged in the cylinder sleeve, and the rotating shaft is drivingly connected to the piston assembly to change the volume of the variable volume chamber; a liquid suction port and a liquid discharge port are provided on the cylinder sleeve, the liquid suction port is communicated with the variable volume chamber and conveys refrigerant into the variable volume chamber, and the liquid discharge port is communicated with the variable volume chamber and discharges the refrigerant in the variable volume chamber through the liquid discharge port; a buffer groove is also provided on the cylinder sleeve, The inner wall surface of the cylinder liner is provided with a liquid suction groove, which is connected to the liquid suction port through a buffer groove. The buffer groove extends a first preset distance along the circumference of the cylinder liner to form a buffer groove with an arc-shaped cross-section. The liquid suction groove extends a second preset distance along the circumference of the inner wall surface of the cylinder liner to form a cross-section with two oppositely arranged straight line segments and an arc segment connecting the ends of the two straight line segments, so that the intersection between the liquid suction groove and the buffer groove forms an obtuse angle C or a rounded angle D; wherein, there are two liquid suction grooves, the two liquid suction grooves are arranged at intervals along the axial direction of the cylinder liner, and at least one of the two liquid suction grooves passes through the axial end surface of the cylinder liner.

[0008] In some embodiments, a contour line projection of the liquid suction groove in the axial direction of the cylinder sleeve includes two oppositely disposed straight line segments and an arc segment connecting ends of the two straight line segments.

[0009] In some embodiments, the bending directions of the two arc segments in the radial direction of the cylinder liner are consistent.

[0010] In some embodiments, at least one end of the buffer groove passes through the axial end surface of the cylinder liner; or, both ends of the buffer groove do not pass through the axial end surface of the cylinder liner.

[0011] In some embodiments, there are two liquid suction grooves, which are spaced apart along the axial direction of the cylinder sleeve, and both of the liquid suction grooves are connected to the buffer groove.

[0012] In some embodiments, the ratio of the height Hg4 of the connection between the two liquid suction grooves in the axial direction of the cylinder sleeve to the height Hg1 of the cylinder sleeve in the axial direction thereof is in the range of 0.1 to 0.5.

[0013] In some embodiments, the upper suction groove has an axial depth H of the cylinder sleeve. g2 The height H of the cylinder liner in its axial direction g1 The ratio ranges from 0.2 to 0.4.

[0014] In some embodiments, the depth H of the suction groove located below the cylinder sleeve is g3 The height H of the cylinder liner in its axial direction g1 The ratio ranges from 0.2 to 0.4.

[0015] In some embodiments, the diameter of the pipette port is D g2 The first flow area of ​​the corresponding suction port is S g2 ; The width W of the upper suction trough g2 The axial depth H of the upper suction groove in the cylinder liner g2 The product of is the second flow area S of the suction trough g3 , where S g3 / S g2 The value range is 0.3~0.7.

[0016] In some embodiments, the diameter of the pipette port is D g2 The first flow area of ​​the corresponding suction port is S g2 ; The width W of the suction groove below g2 The depth H of the suction groove located below in the axial direction of the cylinder sleeve g3 The product of is the third flow area S of the suction trough g4 , where S g4 / Sg2 The value range is 0.3~0.7.

[0017] In some embodiments, the rotating shaft is provided with two eccentric parts along its axial direction, and the piston assembly includes a piston sleeve and a piston, wherein the piston sleeve is rotatably arranged in the cylinder sleeve, and the piston sleeve has two limiting channels, and the two limiting channels are arranged sequentially along the axial direction of the rotating shaft, and the extension direction of the limiting channels is perpendicular to the axial direction of the rotating shaft; the piston has a through hole, and there are two pistons, and the two eccentric parts extend into the two through holes of the two pistons respectively, and the two pistons are correspondingly slidably arranged in the two limiting channels and form a variable volume chamber, and the variable volume chamber is located in the sliding direction of the piston. The rotating shaft rotates to drive the piston to slide back and forth in the limiting channel while interacting with the piston sleeve to make the piston sleeve and the piston rotate in the cylinder sleeve.

[0018] In some embodiments, the height H of the connection between the two suction grooves in the axial direction of the cylinder sleeve is g4 The height H of the connection between the two limiting channels in the axial direction of the piston sleeve q2 The ratio ranges from 1.5 to 4.

[0019] In some embodiments, the height H of the connection between the two suction grooves in the axial direction of the cylinder sleeve is g4 The height H of the connection between the two limiting channels in the axial direction of the piston sleeve q2 The ratio ranges from 2.1 to 3.

[0020] In some embodiments, there is a phase difference of a first angle A between the two eccentric portions, the eccentricity of the two eccentric portions is equal, and there is a phase difference of a second angle B between the extension directions of the two limiting channels, wherein the first angle A is twice the second angle B.

[0021] In some embodiments, the two eccentric portions are arranged 180° apart from each other.

[0022] According to another aspect of the present disclosure, a rotary cylinder pump is provided, including a pump body assembly, which is the above-mentioned pump body assembly.

[0023] According to another aspect of the present disclosure, a heat exchange device is provided, including a rotary cylinder pump, which is the rotary cylinder pump described above.

[0024] By applying the technical solution disclosed in the present invention, at least one of the two liquid suction grooves is passed through the axial end surface of the cylinder liner, so that the intersection between the liquid suction groove and the buffer groove that pass through the axial end surface of the cylinder liner forms an obtuse angle C or a rounded angle D. In this way, the processed cylinder liner is not prone to burrs and flanging, and the wall surface at the edge is relatively thick, ensuring that the subsequent cylinder liner is not prone to falling off and forming impurities during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute part of the present disclosure, are intended to provide a further understanding of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are intended to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the accompanying drawings:

[0026] FIG1 is a schematic structural diagram of a cylinder sleeve of a pump assembly according to an optional embodiment of the present disclosure;

[0027] FIG2 is a schematic structural diagram of the cylinder liner in FIG1 from a top view;

[0028] FIG3 shows a schematic cross-sectional view of the structure from the EE perspective in FIG2 ;

[0029] FIG4 shows a schematic diagram of the size structure of the cylinder liner in FIG3 ;

[0030] FIG5 shows a schematic diagram of the size structure of the cylinder liner in FIG3 ;

[0031] FIG6 shows a schematic cross-sectional structural diagram of the cylinder liner in FIG1 ;

[0032] FIG7 is a schematic structural diagram showing the enlarged connection between the two liquid suction grooves of the cylinder sleeve in FIG6 ;

[0033] FIG8 is a schematic structural diagram of a piston sleeve of a pump assembly according to an optional embodiment of the present disclosure;

[0034] FIG9 shows a schematic cross-sectional structural diagram of the piston sleeve in FIG8 at a ZZ perspective;

[0035] FIG10 is a schematic structural diagram showing a top view of the piston sleeve in FIG8 .

[0036] The above drawings include the following reference numerals: 20, cylinder sleeve; 21, liquid suction port; 22, liquid discharge port; 23, buffer tank; 24, liquid suction tank; 30, piston assembly; 31, piston sleeve; 311, limiting channel. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0038] In order to solve the problem of sharp corners or sharp edges at the intersection of the inlet buffer tank and the suction tank of the cylinder liner in the related technology, the present disclosure provides a pump body assembly, a rotary cylinder pump and a heat exchange device, wherein the rotary cylinder pump includes a pump body assembly, the pump body assembly is the above-mentioned and below-mentioned pump body assembly, and the heat exchange device includes a rotary cylinder pump, and the rotary cylinder pump is the above-mentioned rotary cylinder pump.

[0039] As shown in Figures 1 to 10, the pump body assembly includes a rotating shaft, a cylinder sleeve 20 and a piston assembly 30, wherein the rotating shaft and the cylinder sleeve 20 are eccentrically arranged and the eccentric distance is fixed; the piston assembly 30 has a variable volume chamber, the piston assembly 30 is rotatably arranged in the cylinder sleeve 20, and the rotating shaft is driven and connected to the piston assembly 30 to change the volume of the variable volume chamber; a liquid suction port 21 and a liquid discharge port 22 are provided on the cylinder sleeve 20, the liquid suction port 21 is communicated with the variable volume chamber and conveys refrigerant into the variable volume chamber, and the liquid discharge port 22 is communicated with the variable volume chamber and discharges the refrigerant in the variable volume chamber from the liquid discharge port 22; a buffer groove 23 is also provided on the cylinder sleeve 20, and the inner wall surface of the cylinder sleeve 20 has a suction port 21 and a liquid discharge port 22. The liquid trough 24, the liquid suction trough 24 is connected to the liquid suction port 21 through the buffer groove 23, the buffer groove 23 extends a first preset distance along the circumference of the cylinder liner 20 to form a buffer groove 23 with an arc-shaped cross-section, and the liquid suction groove 24 extends a second preset distance along the circumference of the inner wall surface of the cylinder liner 20 to form a cross-section with two oppositely arranged straight line segments and an arc segment connecting the ends of the two straight line segments, so that the intersection between the liquid suction groove 24 and the buffer groove 23 forms an obtuse angle C or a rounded angle D; wherein, there are two liquid suction grooves 24, the two liquid suction grooves 24 are arranged at intervals along the axial direction of the cylinder liner 20, and at least one of the two liquid suction grooves 24 passes through the axial end surface of the cylinder liner 20.

[0040] By passing at least one of the two liquid suction grooves 24 through the axial end surface of the cylinder liner 20, an obtuse angle C or a rounded angle D is formed at the intersection between the liquid suction groove 24 and the buffer groove 23 that pass through the axial end surface of the cylinder liner 20. In this way, the processed cylinder liner is less likely to have burrs and flanging, and the wall surface at the edge is relatively thick, ensuring that the subsequent cylinder liner is not likely to fall off and form impurities during long-term use.

[0041] It should be noted that, in the present disclosure, the contour line projection of the liquid suction groove 24 in the axial direction of the cylinder sleeve 20 includes two oppositely arranged straight line segments and an arc segment connecting the ends of the two straight line segments.

[0042] In some embodiments, the curvature directions of the two arc segments in the radial direction of the cylinder liner 20 are consistent.

[0043] It should be noted that, in the present disclosure, at least one end of the buffer groove 23 passes through the axial end surface of the cylinder liner 20 ; or, both ends of the buffer groove 23 do not pass through the axial end surface of the cylinder liner 20 .

[0044] As shown in FIG. 1 to FIG. 7 , there are two liquid suction grooves 24 , which are spaced apart along the axial direction of the cylinder sleeve 20 , and both of the liquid suction grooves 24 are connected to the buffer groove 23 .

[0045] As shown in FIG5 , the height H of the connection between the two liquid suction grooves 24 in the axial direction of the cylinder sleeve 20 is g4 The height H of the cylinder liner 20 in its axial direction g1 The ratio range is 0.1 to 0.5.

[0046] As shown in FIG5 , the depth H of the upper liquid suction groove 24 in the axial direction of the cylinder sleeve 20 is g2 The height H of the cylinder liner 20 in its axial direction g1 The ratio ranges from 0.2 to 0.4.

[0047] As shown in FIG5 , the depth H of the liquid suction groove 24 located at the bottom in the axial direction of the cylinder sleeve 20 is g3 The height H of the cylinder liner 20 in its axial direction g1 The ratio ranges from 0.2 to 0.4.

[0048] As shown in FIG4 and FIG5, the diameter of the liquid suction port 21 is D g2 The first flow area of ​​the corresponding suction port 21 is S g2 The width W of the upper suction groove 24 is g2 The depth H of the upper suction groove 24 in the axial direction of the cylinder liner 20 is g2 The product of is the second flow area S of the suction groove 24 g3 , where S g3 / S g2 The value range is 0.3~0.7.

[0049] As shown in FIG4 and FIG5, the diameter of the liquid suction port 21 is D g2 The first flow area of ​​the corresponding suction port 21 is S g2 The width W of the suction groove 24 located below g2 The depth H of the liquid suction groove 24 located below in the axial direction of the cylinder liner 20 is g3 The product of is the third flow area S of the suction groove 24 g4 , where S g4 / S g2 The value range is 0.3~0.7.

[0050] It should be noted that in the present disclosure, two eccentric parts are provided along the axial direction of the rotating shaft, and the piston assembly 30 includes a piston sleeve 31 and a piston, wherein the piston sleeve 31 is rotatably arranged in the cylinder sleeve 20, and the piston sleeve 31 has two limiting channels 311, and the two limiting channels 311 are arranged sequentially along the axial direction of the rotating shaft, and the extension direction of the limiting channels 311 is perpendicular to the axial direction of the rotating shaft; the piston has a through hole, and there are two pistons, and the two eccentric parts extend into the two through holes of the two pistons respectively, and the two pistons are correspondingly slidably arranged in the two limiting channels 311 and form a variable volume chamber, which is located in the sliding direction of the piston. The rotating shaft rotates to drive the piston to slide back and forth in the limiting channel 311 while interacting with the piston sleeve 31, so that the piston sleeve 31 and the piston rotate in the cylinder sleeve 20.

[0051] As shown in FIG5 and FIG9, the height H of the connection between the two liquid suction grooves 24 in the axial direction of the cylinder sleeve 20 is g4 The height H of the connection between the two limiting channels 311 in the axial direction of the piston sleeve 31 q2 The ratio ranges from 1.5 to 4.

[0052] As shown in FIG5 and FIG9, the height H of the connection between the two liquid suction grooves 24 in the axial direction of the cylinder sleeve 20 is g4 The height H of the connection between the two limiting channels 311 in the axial direction of the piston sleeve 31 q2 The ratio ranges from 2.1 to 3.

[0053] It should be noted that in the present disclosure, there is a phase difference of a first angle A between the two eccentric parts, the eccentricity of the two eccentric parts is equal, and there is a phase difference of a second angle B between the extension directions of the two limiting channels 311, wherein the first angle A is twice the second angle B.

[0054] In some embodiments, the two eccentric portions are arranged 180° apart from each other.

[0055] 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 disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0057] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0058] 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 disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is 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, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0059] It should be noted that the terms "first," "second," and the like in the specification and claims of the present disclosure and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described herein.

[0060] The foregoing description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A pump assembly, comprising: Rotating shaft; The cylinder sleeve (20), the rotating shaft and the cylinder sleeve (20) are eccentrically arranged with a fixed eccentric distance; A piston assembly (30), the piston assembly (30) having a variable volume chamber, the piston assembly (30) being rotatably disposed in the cylinder sleeve (20), and the rotating shaft being drivingly connected to the piston assembly (30) to change the volume of the variable volume chamber; The cylinder sleeve (20) is provided with a liquid suction port (21) and a liquid discharge port (22), wherein the liquid suction port (21) is communicated with the variable volume chamber and transports refrigerant into the variable volume chamber, and the liquid discharge port (22) is communicated with the variable volume chamber and discharges the refrigerant in the variable volume chamber through the liquid discharge port (22); The cylinder sleeve (20) is also provided with a buffer groove (23), the inner wall surface of the cylinder sleeve (20) has a liquid suction groove (24), the liquid suction groove (24) is connected with the liquid suction port (21) through the buffer groove (23), the buffer groove (23) extends a first preset distance along the circumference of the cylinder sleeve (20) to form a buffer groove (23) with an arc-shaped cross section, and the liquid suction groove (24) extends a second preset distance along the circumference of the inner wall surface of the cylinder sleeve (20) to form a cross section with two oppositely arranged straight line segments and an arc segment connecting the ends of the two straight line segments, so that the intersection between the liquid suction groove (24) and the buffer groove (23) forms an obtuse angle C or a rounded angle D; There are two liquid suction grooves (24), the two liquid suction grooves (24) are spaced apart along the axial direction of the cylinder sleeve (20), and at least one of the two liquid suction grooves (24) passes through the axial end surface of the cylinder sleeve (20).

2. The pump assembly according to claim 1, wherein: The contour line projection of the liquid suction groove (24) in the axial direction of the cylinder sleeve (20) includes two oppositely arranged straight line segments and an arc segment connecting the ends of the two straight line segments.

3. The pump assembly according to claim 2, wherein: The bending directions of the two arc segments in the radial direction of the cylinder sleeve (20) are consistent.

4. The pump assembly according to claim 1, wherein: At least one end of the buffer groove (23) passes through the axial end surface of the cylinder sleeve (20); or, Both ends of the buffer groove (23) do not penetrate the axial end surface of the cylinder sleeve (20).

5. The pump assembly according to claim 1, wherein: There are two liquid suction grooves (24), which are spaced apart along the axial direction of the cylinder sleeve (20), and both of the liquid suction grooves (24) are connected to the buffer groove (23).

6. The pump assembly according to claim 1, wherein: The ratio of the height Hg4 of the connection between the two liquid suction grooves (24) in the axial direction of the cylinder sleeve (20) to the height Hg1 of the cylinder sleeve (20) in the axial direction thereof is in the range of 0.1 to 0.

5.

7. The pump assembly according to claim 1, wherein: The axial depth H of the liquid suction groove (24) located above the cylinder sleeve (20) is g2 The height H of the cylinder sleeve (20) in the axial direction g1 The ratio ranges from 0.2 to 0.

4.

8. The pump assembly according to claim 1, wherein: The depth H of the suction groove (24) located below in the axial direction of the cylinder sleeve (20) is g3 The height H of the cylinder sleeve (20) in the axial direction g1 The ratio ranges from 0.2 to 0.

4.

9. The pump assembly according to claim 1, wherein: The diameter of the liquid suction port (21) is D g2 The first flow area of ​​the liquid suction port (21) corresponding to the time is S g2 ; The width W of the liquid suction groove (24) located above g2 The depth H of the liquid suction groove (24) located above in the axial direction of the cylinder sleeve (20) is g2 The product of is the second flow area S of the liquid suction trough (24). g3 , where S g3 / S g2 The value range is 0.3~0.

7.

10. The pump assembly according to claim 1, wherein: The diameter of the liquid suction port (21) is D g2 The first flow area of ​​the liquid suction port (21) corresponding to the time is S g2 ; The width W of the liquid suction groove (24) located below is g2 The depth H of the suction groove (24) located below in the axial direction of the cylinder sleeve (20) is g3 The product of is the third flow area S of the liquid suction trough (24). g4 , where S g4 / S g2 The value range is 0.3~0.

7.

11. The pump assembly according to any one of claims 1 to 10, wherein: The rotating shaft is provided with two eccentric parts along its axial direction, and the piston assembly (30) comprises: A piston sleeve (31), the piston sleeve (31) being rotatably disposed in the cylinder sleeve (20), the piston sleeve (31) having two limiting channels (311), the two limiting channels (311) being sequentially disposed along the axial direction of the rotating shaft, and the extending direction of the limiting channels (311) being perpendicular to the axial direction of the rotating shaft; A piston, wherein the piston has a through hole, and there are two pistons, the two eccentric parts correspondingly extend into the two through holes of the two pistons, the two pistons are correspondingly slidably arranged in the two limiting channels (311) and form the variable volume chamber, and the variable volume chamber is located in the sliding direction of the piston, and the rotating shaft rotates to drive the piston to slide back and forth in the limiting channel (311) and interact with the piston sleeve (31) at the same time, so that the piston sleeve (31) and the piston rotate in the cylinder sleeve (20).

12. The pump assembly according to claim 11, wherein: The height H of the connection between the two liquid suction grooves (24) in the axial direction of the cylinder sleeve (20) is g4 The height H of the connection between the two limiting channels (311) in the axial direction of the piston sleeve (31) is q2 The ratio ranges from 1.5 to 4.

13. The pump assembly according to claim 12, wherein: The height H of the connection between the two liquid suction grooves (24) in the axial direction of the cylinder sleeve (20) is g4 The height H of the connection between the two limiting channels (311) in the axial direction of the piston sleeve (31) is q2 The ratio ranges from 2.1 to 3.

14. The pump assembly according to claim 11, wherein: There is a phase difference of a first angle A between the two eccentric parts, the eccentricity of the two eccentric parts is equal, and there is a phase difference of a second angle B between the extension directions of the two limiting channels (311), wherein the first angle A is twice the second angle B.

15. The pump assembly according to claim 14, wherein: The two eccentric parts are arranged opposite to each other at an angle of 180 degrees.

16. A rotary cylinder pump, comprising a pump body assembly, wherein the pump body assembly is the pump body assembly according to any one of claims 1 to 15.

17. A heat exchange device, comprising a rotary cylinder pump, wherein the rotary cylinder pump is the rotary cylinder pump according to claim 16.

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