Pump body assembly and fluid machine

Abstract

The invention provides a pump body assembly and a fluid machine. The pump body assembly comprises a crankshaft; the crankshaft and the cylinder sleeve are eccentrically arranged, and the eccentric distance is fixed; the piston assembly is provided with a variable volume cavity, the piston assembly is rotatably arranged in the cylinder sleeve, and the crankshaft is in driving connection with the piston assembly to change the volume of the variable volume cavity; the number of the flanges is two, and the two flanges are arranged at the two axial ends of the cylinder sleeve respectively. The cylinder sleeve is provided with a liquid inlet channel and a first liquid discharging channel, at least one flange is provided with a second liquid discharging channel, and the liquid inlet channel is communicated with the variable volume cavity and conveys refrigerants into the variable volume cavity. And the first liquid discharge channel and the second liquid discharge channel are respectively communicated with the variable volume cavity, and a refrigerant in the variable volume cavity is discharged from the first liquid discharge channel and the second liquid discharge channel. The problem that in the prior art, the operation reliability of a pump body assembly is poor is solved.

Description

Technical Field

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

[0002] With the development of society, the power consumption of data centers is increasing year by year, resulting in huge power consumption. Computer room air conditioning is an important part of the data center, accounting for 40% of the power consumption of the data center. The application of its energy-saving technology is of great significance.

[0003] Computer room air conditioners are devices used to cool the electrical components of data centers. They need to be cooled continuously all year round to ensure that the indoor temperature can be maintained within a certain range. Most of the existing computer room air conditioners use compression refrigeration technology, and rely on compression refrigeration systems for cooling in both summer and winter. When the ambient temperature is high, the existing compression refrigeration technology can meet the performance and energy efficiency requirements; when the outdoor ambient temperature is significantly lower than the indoor temperature, the most economical and energy-saving refrigeration method is to use the low temperature outdoors to cool the indoor temperature. At this time, a liquid pump can be used instead of a compressor to drive the refrigerant to run in the system, which has higher energy efficiency than conventional air conditioning systems. In the industry, this system that uses a pump to drive the refrigerant is called a fluorine pump system; the pump that drives the refrigerant is called a fluorine pump.

[0004] However, due to the large pressure difference between the liquid inlet side and the liquid discharge side of the cylinder liner in the pump body assembly, and between the compression chamber and the liquid inlet chamber, the existing fluorine pump causes uneven force on the piston. The high-pressure side always pushes the piston toward the low-pressure side, and the load-bearing side of the inner circle of the cylinder liner is subjected to greater force, resulting in increased wear and friction power consumption on the low-pressure load-bearing side of the inner circle of the cylinder liner, which greatly affects the performance and operational reliability of the fluorine pump.

[0005] As can be seen from the above, the prior art has the problem of poor operating reliability of the pump assembly. Summary of the invention

[0006] The main purpose of the present invention is to provide a pump body assembly and a fluid machine to solve the problem of poor operating reliability of the pump body assembly in the prior art.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a pump body assembly is provided, including: a crankshaft; a cylinder liner, the crankshaft and the cylinder liner are eccentrically arranged and the eccentric distance is fixed; a piston assembly, the piston assembly has a variable volume chamber, the piston assembly is rotatably arranged in the cylinder liner, and the crankshaft and the piston assembly are drivingly connected to change the volume of the variable volume chamber; a flange, there are two flanges, and the two flanges are respectively arranged at the axial ends of the cylinder liner; a liquid inlet channel and a first liquid discharge channel are arranged on the cylinder liner, and a second liquid discharge channel is arranged on at least one flange, the liquid inlet channel is connected with the variable volume chamber and transports refrigerant to the variable volume chamber, and the first liquid discharge channel and the second liquid discharge channel are respectively connected with the variable volume chamber and the refrigerant in the variable volume chamber is discharged through the first liquid discharge channel and the second liquid discharge channel.

[0008] Furthermore, the first liquid discharge channel penetrates the inner and outer wall surfaces of the cylinder sleeve in the radial direction, and the second liquid discharge channel at least partially overlaps with the variable volume chamber in the axial direction.

[0009] Furthermore, the radial cross-sectional area S1 of the variable volume chamber and the effective area S2 of the first liquid discharge channel satisfy: 1≤S1 / S2≤2.

[0010] Furthermore, the radial cross-sectional area S1 of the variable volume chamber and the effective area S3 of the second drainage channel satisfy: 2≤S1 / S3<3.

[0011] Furthermore, when the operating angle of the piston assembly is 0°, there is a sealing angle α between the piston assembly and the cylinder sleeve.

[0012] Furthermore, the sealing angle α satisfies: 0≤α≤10°.

[0013] Furthermore, when the operating angle of the piston assembly is θ1, the variable volume chamber is connected to the second liquid discharge channel, and when the operating angle of the piston assembly is 180°-θ2, the variable volume chamber is disconnected from the second liquid discharge channel, wherein α≤θ1≤90°, α≤θ2≤90°.

[0014] Furthermore, the second liquid discharge channel is in a straight line shape, an L shape, an arc shape or a circular hole shape.

[0015] Furthermore, the piston assembly includes: a piston sleeve, which is rotatably arranged in the cylinder sleeve, and the piston sleeve has a limiting channel, and the extension direction of the limiting channel is perpendicular to the axial direction of the crankshaft; a piston, which is slidingly arranged in the limiting channel to form a variable volume chamber, and the variable volume chamber is located in the sliding direction of the piston, and the piston has a sliding groove. During the rotation of the crankshaft, the piston slides relative to the crankshaft so that the crankshaft and the groove wall of the sliding groove are slidably matched, and the piston rotates with the crankshaft under the drive of the crankshaft and at the same time slides back and forth in the piston sleeve along the axial direction perpendicular to the crankshaft.

[0016] Furthermore, the crankshaft is provided with two eccentric parts along its axial direction, and the piston assembly comprises: a piston sleeve, which is rotatably arranged in the cylinder sleeve, and the piston sleeve has two limiting channels, and the two limiting channels are arranged in sequence along the axial direction of the crankshaft, and the extension direction of the limiting channels is perpendicular to the axial direction of the crankshaft; a piston, which 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 respectively form two variable volume chambers, and the two variable volume chambers are respectively located in the sliding directions of the two pistons, and the crankshaft rotates to drive the piston to slide back and forth in the limiting channel while interacting with the piston sleeve, so that the piston sleeve and the piston rotate in the cylinder sleeve.

[0017] Furthermore, the two eccentric portions are arranged at an angle of 180°.

[0018] Furthermore, the limiting channel has a group of first sliding surfaces arranged opposite to each other in sliding contact with the piston, the piston has a second sliding surface cooperating with the first sliding surface, the piston has an extrusion surface facing the end of the limiting channel, the extrusion surface serves as the head of the piston, the two second sliding surfaces are connected by the extrusion surface, and the extrusion surface faces the variable volume chamber.

[0019] Furthermore, there are two first liquid discharge channels, the two flanges are respectively provided with second liquid discharge channels, and the two variable volume chambers are respectively communicated with one first liquid discharge channel and one second liquid discharge channel.

[0020] Furthermore, a liquid inlet buffer groove is also provided on the cylinder sleeve, and the liquid inlet channel is connected with both variable volume chambers through the liquid inlet buffer groove.

[0021] Furthermore, the liquid inlet channel and the first liquid discharge channel are arranged 180 degrees opposite to each other in the circumferential direction of the pump body assembly, and the first liquid discharge channel and the second liquid discharge channel are correspondingly arranged along the axial direction of the pump body assembly.

[0022] According to another aspect of the present invention, a fluid machine is provided, comprising the above-mentioned pump body assembly.

[0023] Furthermore, the fluid machinery is a fluorine pump.

[0024] According to the technical solution of the present invention, the pump body assembly includes a crankshaft, a cylinder liner, a piston assembly and a flange. The crankshaft and the cylinder liner are eccentrically arranged with a fixed eccentric distance. The piston assembly has a variable volume chamber. The piston assembly is rotatably arranged in the cylinder liner, and the crankshaft and the piston assembly are drivingly connected to change the volume of the variable volume chamber. There are two flanges, which are respectively arranged at the axial ends of the cylinder liner. A liquid inlet channel and a first liquid discharge channel are arranged on the cylinder liner. A second liquid discharge channel is arranged on at least one flange. The liquid inlet channel is connected with the variable volume chamber and transports refrigerant into the variable volume chamber. The first liquid discharge channel and the second liquid discharge channel are respectively connected with the variable volume chamber and the refrigerant in the variable volume chamber is discharged through the first liquid discharge channel and the second liquid discharge channel. In this way, the refrigerant in the variable volume chamber is discharged through the first liquid discharge channel and the second liquid discharge channel. Adding a second drainage channel can reduce the area of ​​the first drainage channel on the cylinder liner while ensuring drainage, thereby reducing the thrust area of ​​the piston assembly on the high-pressure side, and further reducing the wear and friction power consumption on the low-pressure bearing side of the inner circle of the cylinder liner. Furthermore, it can also reduce drainage resistance, reduce instantaneous pressure during drainage, reduce over-compression, reduce insufficient drainage of the pump body assembly, and improve efficiency. In addition, the second drainage channel can also increase pressure on the piston end face of the piston assembly, thereby reducing the tilt of the piston when the pump body assembly is in operation, reducing the wear between the piston end face and the flange end face, improving lubrication, and greatly improving the operating reliability of the pump body assembly, solving the problem of poor operating reliability of the pump body assembly in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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:

[0026] Figure 1 An exploded view of a pump assembly in a specific embodiment of the present invention is shown;

[0027] Figure 2 A cross-sectional view of a pump assembly in a specific embodiment of the present invention is shown;

[0028] Figure 3 A schematic diagram showing the sealing angle of a pump assembly in a specific embodiment of the present invention;

[0029] Figure 4 A schematic diagram showing a flange in a specific embodiment of the present invention when it starts to discharge liquid is shown;

[0030] Figure 5 A schematic diagram showing the flange in a specific embodiment of the present invention when the fluid is discharged is completed;

[0031] Figure 6 A schematic diagram showing a radial cross-sectional area S1 of a variable volume chamber in a specific embodiment of the present invention is shown;

[0032] Figure 7 A schematic diagram showing an effective area S2 of a first liquid discharge channel in a specific embodiment of the present invention is shown;

[0033] Figure 8 A schematic diagram showing the effective area S3 of the second liquid discharge channel in a specific embodiment of the present invention is shown.

[0034] The above drawings include the following reference numerals:

[0035] 10. crankshaft; 11. eccentric part; 20. cylinder liner; 21. liquid inlet channel; 22. first liquid discharge channel; 23. liquid inlet buffer tank; 24. liquid inlet chamber; 30. piston assembly; 31. piston sleeve; 311. limit channel; 312. variable volume chamber; 32. piston; 321. through hole; 322. extrusion surface; 323. pressure relief guide groove; 40. flange; 41. second liquid discharge channel. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In order to solve the problem of poor operating reliability of the pump assembly in the prior art, the present invention provides a pump assembly and a fluid machine, wherein the fluid machine includes the pump assembly.

[0038] like Figures 1 to 8 As shown, the pump body assembly includes a crankshaft 10, a cylinder sleeve 20, a piston assembly 30 and a flange 40. The crankshaft 10 and the cylinder sleeve 20 are eccentrically arranged and the eccentric distance is fixed. The piston assembly 30 has a variable volume chamber 312, the piston assembly 30 is rotatably arranged in the cylinder sleeve 20, and the crankshaft 10 and the piston assembly 30 are drivingly connected to change the volume of the variable volume chamber 312. There are two flanges 40, and the two flanges 40 are respectively arranged at the axial ends of the cylinder sleeve 20. The cylinder sleeve 20 is provided with a liquid inlet channel 21 and a first liquid discharge channel 22, and at least one flange 40 is provided with a second liquid discharge channel 41, the liquid inlet channel 21 is connected with the variable volume chamber 312 and transports the refrigerant into the variable volume chamber 312, and the first liquid discharge channel 22 and the second liquid discharge channel 41 are respectively connected with the variable volume chamber 312 and the refrigerant in the variable volume chamber 312 is discharged from the first liquid discharge channel 22 and the second liquid discharge channel 41.

[0039] By adding a second drainage channel 41 to the flange 40, the area of ​​the first drainage channel 22 on the cylinder liner 20 can be reduced while ensuring drainage, thereby reducing the thrust area of ​​the piston assembly 30 on the high-pressure side, and further reducing the wear and friction power consumption on the low-pressure bearing side of the inner circle of the cylinder liner 20. Furthermore, the drainage resistance can be reduced, the instantaneous pressure during the drainage process can be reduced, over-compression can be reduced, and insufficient drainage of the pump body assembly can be reduced, thereby improving efficiency. In addition, the second drainage channel 41 can also increase the pressure on the piston end face of the piston assembly 30, thereby reducing the tilt of the piston when the pump body assembly is in operation, reducing the wear between the piston end face and the flange end face, improving lubrication, and greatly improving the operating reliability of the pump body assembly.

[0040] In this embodiment, the liquid inlet channel 21 and the first liquid discharge channel 22 are arranged 180° opposite to each other in the circumferential direction of the pump body assembly, that is, the liquid inlet channel 21 and the first liquid discharge channel 22 are arranged opposite to each other on the cylinder sleeve 20. The first liquid discharge channel 22 and the second liquid discharge channel 41 are arranged correspondingly along the axial direction of the pump body assembly, that is, the first liquid discharge channel 22 and the second liquid discharge channel 41 are arranged correspondingly up and down and are located on the same side. Further, the second liquid discharge channel 41 at least partially overlaps with the variable volume chamber 312 in the axial direction of the pump body assembly, so that it can be communicated with the variable volume chamber 312.

[0041] In the present embodiment, the first liquid discharge channel 22 radially penetrates the inner and outer wall surfaces of the cylinder liner 20. That is to say, on the liquid discharge side, the cylinder liner is not provided with other channels or groove structures. Correspondingly, on the liquid inlet side, a liquid inlet buffer groove 23 is also provided on the cylinder liner 20, and the liquid inlet channel 21 is connected with the variable volume chamber 312 through the liquid inlet buffer groove 23. Specifically, the liquid inlet buffer groove 23 extends a preset distance along the circumference of the cylinder liner 20 to form a liquid inlet buffer groove 23 with an arc-shaped cross-section, and the diameter of the liquid inlet channel 21 and / or the diameter of the first liquid discharge channel 22 is smaller than the arc length of the arc-shaped liquid inlet buffer groove 23. In this way, it is ensured that the liquid inlet buffer groove 23 can play an effective buffering role on the refrigerant, which is beneficial to reduce the inlet pressure pulsation of the pump body assembly.

[0042] Further, such as Figures 3 to 5 As shown, the inner wall surface of the cylinder liner 20 has a liquid inlet cavity 24, which is connected to the liquid inlet channel 21, and the liquid inlet cavity 24 extends along the circumference of the inner wall surface of the cylinder liner 20 by a preset distance to form an arc-shaped liquid inlet cavity 24, wherein the arc length of the arc-shaped liquid inlet buffer groove 23 is not less than the arc length of the arc-shaped liquid inlet cavity 24. In this way, it is ensured that the liquid inlet buffer groove 23 can play an effective buffering role for the refrigerant, thereby facilitating the reduction of the inlet pressure pulsation of the pump assembly.

[0043] In this embodiment, the line connecting the arc length center of the arc-shaped liquid inlet buffer groove 23 and the arc length center of the arc-shaped liquid inlet cavity 24 passes through the geometric center of the cylinder sleeve 20. In this way, the buffer reliability of the liquid inlet buffer groove 23 to the refrigerant is ensured.

[0044] like Figures 1 to 6As shown, the piston assembly 30 includes a piston sleeve 31 and a piston 32. The piston sleeve 31 is rotatably arranged in the cylinder sleeve 20, and the piston sleeve 31 has a limiting channel 311, and the extension direction of the limiting channel 311 is perpendicular to the axial direction of the crankshaft 10; the piston 32 is slidably arranged in the limiting channel 311 to form a variable volume chamber 312, and the variable volume chamber 312 is located in the sliding direction of the piston 32, and the piston 32 has a sliding groove. During the rotation of the crankshaft 10, the piston 32 slides relative to the crankshaft 10, so that the crankshaft 10 and the groove wall of the sliding groove are slidably matched, and the piston 32 rotates with the crankshaft 10 under the drive of the crankshaft 10 and slides back and forth in the piston sleeve 31 along the axial direction perpendicular to the crankshaft 10 at the same time.

[0045] In this embodiment, if Figure 1 As shown, the crankshaft 10 is provided with two eccentric parts 11 along its axial direction. Correspondingly, the piston 32 has a through hole 321. There are two pistons 32. The two eccentric parts 11 extend into the two through holes 321 of the two pistons 32 respectively. The two pistons 32 are correspondingly slidably arranged in the two limiting channels 311 and respectively form two variable volume chambers 312. The two variable volume chambers 312 are respectively located in the sliding direction of the two pistons 32. The crankshaft 10 rotates to drive the piston 32 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 32 rotate in the cylinder sleeve 20.

[0046] Preferably, the two eccentric portions 11 are arranged at an angle of 180°.

[0047] In this embodiment, there is a phase difference of a first angle between the two eccentric parts 11, the eccentricity of the two eccentric parts 11 is equal, and there is a limit difference of a second angle between the extension directions of the two limit channels 311, wherein the first angle is twice the second angle. In this way, when one of the two pistons 32 is at the dead point position, that is, the driving torque of the eccentric part 11 corresponding to the piston 32 at the dead point position is 0, and the piston 32 at the dead point position cannot continue to rotate. At this time, the driving torque of the other eccentric part 11 of the two eccentric parts 11 driving the corresponding piston 32 is the maximum value, ensuring that the eccentric part 11 with the maximum driving torque can normally drive the corresponding piston 32 to rotate, thereby driving the piston sleeve 31 to rotate through the piston 32, and then driving the piston 32 at the dead point position to continue to rotate through the piston sleeve 31, thereby realizing the stable operation of the rotary cylinder pump.

[0048] like Figure 1As shown, the limiting channel 311 has a set of first sliding surfaces that are oppositely arranged and in sliding contact with the piston 32, the piston 32 has a second sliding surface that cooperates with the first sliding surface, the piston 32 has an extrusion surface 322 facing the end of the limiting channel 311, the extrusion surface 322 serves as the head of the piston 32, the two second sliding surfaces are connected by the extrusion surface 322, and the extrusion surface 322 faces the variable volume chamber 312. Furthermore, a pressure relief guide groove 323 is also provided on the extrusion surface 322.

[0049] In this embodiment, when the pump assembly is running, the crankshaft 10 rotates around the axis of the crankshaft 10; the piston sleeve 31 revolves around the axis of the crankshaft 10, and the axis of the crankshaft 10 is eccentrically arranged with the axis of the piston sleeve 31 and the eccentric distance is fixed; the first piston 32 performs a circular motion with the axis of the crankshaft 10 as the center, and the distance between the center of the first piston 32 and the axis of the crankshaft 10 is equal to the eccentricity of the first eccentric part 11 corresponding to the crankshaft 10, and the eccentricity is equal to the eccentric distance between the axis of the crankshaft 10 and the axis of the piston sleeve 31, the crankshaft 10 rotates to drive the first piston 32 to perform a circular motion, and The first piston 32 interacts with the piston sleeve 31 and slides back and forth in the limiting channel 311 of the piston sleeve 31; the second piston 32 makes a circular motion with the axis of the crankshaft 10 as the center, and the distance between the center of the second piston 32 and the axis of the crankshaft 10 is equal to the eccentricity of the second eccentric part 11 corresponding to the crankshaft 10, and the eccentricity is equal to the eccentric distance between the axis of the crankshaft 10 and the axis of the piston sleeve 31. The crankshaft 10 rotates to drive the second piston 32 to make a circular motion, and the second piston 32 interacts with the piston sleeve 31 and slides back and forth in the limiting channel 311 of the piston sleeve 31.

[0050] The pump body assembly in this embodiment constitutes a cross slider mechanism, and the operating method adopts the principle of the cross slider mechanism.

[0051] In this embodiment, the running track of the piston 32 is a circle, and the circle takes the axis of the crankshaft 10 as the center and the line connecting the axis of the crankshaft 10 and the axis of the piston sleeve 31 as the radius.

[0052] In this embodiment, the liquid inlet channel 21 is connected to both variable volume chambers 312 through the liquid inlet buffer groove 23. There are two first liquid discharge channels 22, and two flanges 40, namely the upper and lower flanges, are respectively provided with second liquid discharge channels 41, and the two variable volume chambers 312 are respectively connected to a first liquid discharge channel 22 and a second liquid discharge channel 41. In other words, the variable volume chamber 312 is arranged in a one-to-one correspondence with the first liquid discharge channel 22 and the second liquid discharge channel 41. By respectively providing the second liquid discharge channel 41 on the upper and lower flanges, the pressure can be increased on the upper and lower end faces of the piston assembly 30, thereby reducing the tilting of the piston when the pump body assembly is in operation, reducing the wear of the piston end face and the flange end face, improving lubrication, and greatly improving the operating reliability of the pump body assembly.

[0053] In this embodiment, if Figures 6 to 8 As shown, when the pump body assembly is in operation, a single variable volume chamber 312 is composed of a piston groove surface, a piston head surface, a flange end surface, and a cylinder sleeve inner circular surface, and the radial cross-sectional area of ​​the variable volume chamber 312 is S1. Among them, the radial cross-sectional area S1 of the variable volume chamber 312 and the effective area S2 of the first liquid discharge channel 22 satisfy: 1≤S1 / S2≤2. The radial cross-sectional area S1 of the variable volume chamber 312 and the effective area S3 of the second liquid discharge channel 41 satisfy: 2≤S1 / S3<3. Through the above-mentioned arrangement, it can be ensured that the liquid discharge channel area of ​​the combination of the first liquid discharge channel 22 and the second liquid discharge channel 41 satisfies that there is no liquid discharge loss and liquid discharge resistance during the operation of the pump body assembly, thereby reducing power consumption and improving performance.

[0054] It can be understood that the effective area of ​​the first drainage channel 22 is the radial cross-sectional area of ​​the first drainage channel 22 , and the effective area of ​​the second drainage channel 41 is the area of ​​the overlapped portion of the second drainage channel 41 and the variable volume chamber 312 .

[0055] like Figure 3 As shown, when the operating angle of the piston assembly 30 is 0°, there is a sealing angle α between the piston assembly 30 and the cylinder sleeve 20. At this time, the liquid inlet chamber 24, the variable volume chamber 312 and the discharge channel are separated. Furthermore, when the piston assembly 30 runs from α to 180°-α, one variable volume chamber 312 of the piston assembly 30 completes the low-pressure refrigerant suction process, and the other variable volume chamber 312 completes the high-pressure refrigerant discharge process. Among them, the sealing angle α satisfies: 0≤α≤10°. Through the above-mentioned arrangement, the operating reliability of the pump body assembly can be guaranteed under the premise of ensuring the sealing reliability of the pump body assembly.

[0056] like Figures 4 to 5 As shown, when the operating angle of the piston assembly 30 is θ1, the variable volume chamber 312 is connected to the second liquid discharge channel 41, and when the operating angle of the piston assembly 30 is 180°-θ2, the variable volume chamber 312 is disconnected from the second liquid discharge channel 41. During this liquid discharge process, the first liquid discharge channel 22 and the second liquid discharge channel 41 jointly complete the liquid discharge process. Among them, α≤θ1≤90°, α≤θ2≤90°. Through the above settings, it can be ensured that the variable volume chamber 312 and the liquid discharge port have a certain sealing distance, and the pump body assembly has no leakage loss during operation, and will not affect the performance.

[0057] In this embodiment, the second liquid discharge channel 41 is in a straight line, L-shaped, arc-shaped or round hole-shaped. Of course, the second liquid discharge channel 41 can also be in other shapes, and the specific shape is determined according to the actual liquid discharge volume requirements and process requirements.

[0058] The present application also provides a fluid machine, comprising the above-mentioned pump body assembly. Specifically, the pump body assembly is a fluorine pump.

[0059] From the above description, it can be seen that the above-mentioned embodiment of the present invention achieves the following technical effects: by adding the second drainage channel 41 to the flange 40, the area of ​​the first drainage channel 22 on the cylinder liner 20 can be reduced under the premise of ensuring drainage, thereby reducing the thrust area of ​​the piston assembly 30 on the high-pressure side, thereby reducing the wear and friction power consumption of the low-pressure bearing side of the inner circle of the cylinder liner 20, and further, it can also reduce the drainage resistance, reduce the instantaneous pressure during the drainage process, reduce over-compression, reduce the insufficient drainage of the pump body assembly, and improve efficiency. In addition, the second drainage channel 41 can also increase the pressure on the piston end face of the piston assembly 30, thereby reducing the tilt of the piston when the pump body assembly is in operation, reducing the wear between the piston end face and the flange end face, improving lubrication, and greatly improving the operating reliability of the pump body assembly.

[0060] 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.

[0061] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0062] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0063] 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 between a device or feature and other devices or features as shown in the figure. 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 figure. For example, if the device in the accompanying 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" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0064] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0065] 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.

[0066] 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.

[0067] The above are only preferred embodiments of the present invention and are 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, characterized in that: include: Crankshaft (10); A cylinder sleeve (20), wherein the crankshaft (10) 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 (312), the piston assembly (30) being rotatably disposed in the cylinder sleeve (20), and the crankshaft (10) being drivingly connected to the piston assembly (30) to change the volume of the variable volume chamber (312); Flanges (40), there are two flanges (40), and the two flanges (40) are respectively arranged at two axial ends of the cylinder sleeve (20); The cylinder sleeve (20) is provided with a liquid inlet channel (21) and a first liquid discharge channel (22), and at least one of the flanges (40) is provided with a second liquid discharge channel (41). The liquid inlet channel (21) is connected to the variable volume chamber (312) and transports refrigerant into the variable volume chamber (312), and the first liquid discharge channel (22) and the second liquid discharge channel (41) are respectively connected to the variable volume chamber (312) and discharge the refrigerant in the variable volume chamber (312) through the first liquid discharge channel (22) and the second liquid discharge channel (41).

2. The pump assembly according to claim 1, characterized in that: The first liquid discharge channel (22) radially penetrates the inner and outer wall surfaces of the cylinder sleeve (20), and the second liquid discharge channel (41) at least partially overlaps with the variable volume chamber (312) in the axial direction.

3. The pump assembly according to claim 1, characterized in that: The radial cross-sectional area S1 of the variable volume chamber (312) and the effective area S2 of the first liquid discharge channel (22) satisfy: 1≤S1 / S2≤2.

4. The pump assembly according to claim 1, characterized in that: The radial cross-sectional area S1 of the variable volume chamber (312) and the effective area S3 of the second liquid discharge channel (41) satisfy: 2≤S1 / S3<3.

5. The pump assembly according to claim 1, characterized in that: When the operating angle of the piston assembly (30) is 0°, a sealing angle α is provided between the piston assembly (30) and the cylinder sleeve (20).

6. The pump assembly according to claim 5, characterized in that: The sealing angle α satisfies: 0≤α≤10°.

7. The pump assembly according to claim 6, characterized in that: When the operating angle of the piston assembly (30) is θ1, the variable volume chamber (312) is connected to the second liquid discharge channel (41); when the operating angle of the piston assembly (30) is 180°-θ2, the variable volume chamber (312) is disconnected from the second liquid discharge channel (41), wherein α≤θ1≤90°, and α≤θ2≤90°.

8. The pump assembly according to claim 1, characterized in that: The second liquid discharge channel (41) is in the shape of a straight line, an L-shape, an arc or a circular hole.

9. The pump assembly according to claim 1, characterized in that: 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 a limiting channel (311), and an extending direction of the limiting channel (311) being perpendicular to an axial direction of the crankshaft (10); A piston (32), wherein the piston (32) is slidably arranged in the limiting channel (311) to form the variable volume chamber (312), and the variable volume chamber (312) is located in the sliding direction of the piston (32), and the piston (32) has a sliding groove. During the rotation of the crankshaft (10), the piston (32) slides relative to the crankshaft (10) so that the crankshaft (10) and the groove wall surface of the sliding groove are slidably matched, and the piston (32) rotates with the crankshaft (10) under the drive of the crankshaft (10) and simultaneously reciprocates in the piston sleeve (31) along an axial direction perpendicular to the crankshaft (10).

10. The pump assembly according to claim 1, characterized in that: The crankshaft (10) is provided with two eccentric parts (11) 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 crankshaft (10), and the extending direction of the limiting channels (311) being perpendicular to the axial direction of the crankshaft (10); A piston (32), wherein the piston (32) has a through hole (321), there are two pistons (32), the two eccentric parts (11) extend into the two through holes (321) of the two pistons (32) respectively, the two pistons (32) are slidably arranged in the two limiting channels (311) and respectively form two variable volume chambers (312), the two variable volume chambers (312) are respectively located in the sliding direction of the two pistons (32), the crankshaft (10) rotates to drive the piston (32) to slide back and forth in the limiting channel (311) and interacts with the piston sleeve (31) so that the piston sleeve (31) and the piston (32) rotate in the cylinder sleeve (20).

11. The pump assembly according to claim 10, characterized in that: The two eccentric parts (11) are arranged at an angle of 180°.

12. The pump assembly according to claim 9 or 10, characterized in that: The limiting channel (311) has a group of first sliding surfaces arranged opposite to each other and in sliding contact with the piston (32); the piston (32) has a second sliding surface matched with the first sliding surface; the piston (32) has an extrusion surface (322) facing the end of the limiting channel (311); the extrusion surface (322) serves as the head of the piston (32); two second sliding surfaces are connected via the extrusion surface (322); and the extrusion surface (322) faces the variable volume chamber (312).

13. The pump assembly according to claim 10, characterized in that: There are two first liquid discharge channels (22), the two flanges (40) are respectively provided with the second liquid discharge channels (41), and the two variable volume chambers (312) are respectively connected to one first liquid discharge channel (22) and one second liquid discharge channel (41).

14. The pump assembly according to claim 10, characterized in that A liquid inlet buffer groove (23) is also provided on the cylinder sleeve (20), and the liquid inlet channel (21) is connected to both of the variable volume chambers (312) through the liquid inlet buffer groove (23).

15. The pump assembly according to claim 1, characterized in that The liquid inlet channel (21) and the first liquid discharge channel (22) are arranged 180 degrees opposite to each other in the circumferential direction of the pump body assembly, and the first liquid discharge channel (22) and the second liquid discharge channel (41) are correspondingly arranged along the axial direction of the pump body assembly.

16. A fluid machine, characterized in that: A pump body assembly comprising any one of claims 1 to 15.

17. The fluid machine according to claim 16, characterized in that: The fluid machinery is a fluorine pump.

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