Pump body component, pump body and compressor

Abstract

This application relates to a pump body component, a pump body, and a compressor. The component has a friction surface, and a nitride layer is provided on the entire surface of the component or the friction surface. The nitride layer includes a penetrating layer and a bright white layer originating from the inside out on the surface of the component. By adding a nitride layer to the surfaces of the various mating components or friction surfaces of the pump body, this application not only significantly improves the wear resistance of the components but also effectively reduces heat accumulation caused by friction during high-load operation, thus reducing efficiency loss due to wear. Furthermore, the presence of the nitride layer improves the corrosion resistance of the pump body during long-term operation, especially when dealing with fluids containing corrosive substances, effectively extending the service life of the pump body and reducing the frequency of component maintenance and replacement.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and more particularly to a pump body component, a pump body, and a compressor. Background Technology

[0002] The development of reciprocating piston compressors towards wider frequency and higher speed has become an industry consensus. Wide-frequency, high-speed reciprocating piston compressors can adapt to a wider range of condensing and evaporating temperature variations, making them particularly suitable for applications with complex climate conditions and large load fluctuations. They can maintain efficient operation over a wider range of operating conditions, thereby improving the stability and adaptability of system operation. At the same time, wide-frequency operation can also avoid frequent start-stop cycles, reduce mechanical shock, and help extend the service life of the compressor and the entire refrigeration system.

[0003] However, the wear resistance of existing conventional cast iron or iron-based powder metallurgy materials is no longer sufficient to meet the reliability requirements of high-frequency and high-speed operation of wide-frequency high-speed reciprocating piston compressors. Pump body parts (such as cylinder seats, pistons, connecting rods, crankshafts, etc.) are prone to wear failure. Moreover, the load force on the pump body parts in wide-frequency high-speed reciprocating piston compressors is greater, which leads to an increase in frictional power consumption between friction pairs, thereby reducing the performance of the compressor, especially when the compressor is operating under high-frequency conditions. Utility Model Content

[0004] This application provides a pump body component, a pump body, and a compressor to solve the problem of insufficient wear resistance of pump body parts.

[0005] In a first aspect, this application provides a pump body component having a friction surface, and a nitride layer is provided on the entire surface or friction surface of the component; the nitride layer includes a permeation layer and a bright white layer starting from the inside out on the surface of the component.

[0006] Preferably, the thickness of the nitride layer is in the range of 20-80 μm.

[0007] In the first embodiment, a phosphating layer is provided on part or all of the surface of the nitride layer.

[0008] Preferably, the thickness of the phosphating layer is in the range of 2-5 μm.

[0009] In the second embodiment, a lubricating layer is provided on the entire surface or part of the surface of the nitride layer.

[0010] Furthermore, a roughening layer is provided between the lubricating layer and the nitride layer.

[0011] In the third embodiment, a lubricating layer is provided on the entire surface or part of the surface of the composite layer composed of the nitride layer and the phosphating layer.

[0012] Preferably, the lubricating layer is a lubricating substance selected from molybdenum disulfide, tungsten disulfide, and polytetrafluoroethylene.

[0013] Preferably, the thickness of the lubricating layer is in the range of 2~10μm.

[0014] Secondly, this application provides a pump body including multiple components, at least one of which is the pump body component described in the first aspect above.

[0015] Furthermore, the multiple components specifically include: a cylinder seat with a shaft hole, a piston mounted in a cylinder in the cylinder seat, a crankshaft mounted on the cylinder seat and passing through the shaft hole, and a connecting rod connecting the crankshaft and the piston.

[0016] Furthermore, the connecting rod includes: a rod portion, and a first bushing that cooperates with the piston and a second bushing that cooperates with the crankshaft, respectively disposed at both ends of the rod portion; the rod portion is provided with an oil passage connecting the inner wall of the first bushing and the inner wall of the second bushing; the first bushing is provided with end face oil grooves on two axial end faces, and the inner wall is provided with an inner wall oil groove that connects the oil passage with the two end face oil grooves.

[0017] Thirdly, this application provides a compressor including the pump body described above.

[0018] The technical solutions provided in this application have the following advantages compared with the prior art: The method provided in this application specifically involves adding a nitride layer to the surfaces or friction surfaces of various mating components of the pump body. This not only significantly improves the wear resistance of the components but also effectively reduces heat accumulation caused by friction during high-load operation, thereby reducing efficiency loss due to wear. Furthermore, the presence of the nitride layer improves the pump body's corrosion resistance during long-term operation, especially when dealing with fluids containing corrosive substances, effectively extending the pump body's service life and reducing the frequency of maintenance and replacement. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0022] Figure 1 This is a schematic diagram of the structure in the first embodiment of this application; Figure 2 This is a schematic diagram of the structure of this application before the loose layer was removed; Figure 3 This is a schematic diagram of the structure in a further embodiment of the first embodiment of this application; Figure 4 This is a schematic diagram of the structure in the third embodiment of this application; Figure 5 This is an exploded view of some components of the pump body in an embodiment of this application; Figure 6 This is a cross-sectional view of the cylinder seat in an embodiment of this application; Figure 7 This is a schematic diagram of the piston structure in an embodiment of this application; Figure 8 This is a structural schematic diagram of the crankshaft from a first-view perspective in an embodiment of this application; Figure 9 This is a structural schematic diagram of the crankshaft from a second perspective in an embodiment of this application; Figure 10 This is a schematic diagram of the connecting rod in an embodiment of this application; Figure 11 This is a cross-sectional view of the connecting rod in an embodiment of this application; Figure 12 for Figure 11 A magnified view of a portion of the image; Figure 13 This is a cross-sectional view of the connecting rod in an embodiment of this application; Figure 14 for Figure 13 A magnified view of a portion of the image; Explanation of reference numerals in the attached figures: 01. Metal substrate; 02. Penetration layer; 03. Brightening layer; 04. Porous layer; 05. Phosphating layer; 06. Roughening layer; 07. Lubricating layer; 10. Cylinder seat; 11. Cylinder; 12. Shaft hole; 20. Flat rolling bearing; 30. Crankshaft; 31. Long shaft; 32. Crank bend; 40. Counterweight; 50. Piston; 51. Piston face; 60. Connecting rod; 61. Second bushing; 62. First bushing; 63. Rod section; 64. Oil passage; 65. Inner wall oil groove; 66. End face oil groove; 70. Piston pin; 80. Snap ring pin. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, various specific processes and materials are provided as examples in this application; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0025] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0026] In the prior art, a crankshaft is provided for use in a compressor. The crankshaft includes a shaft body, a phosphate layer (i.e., a phosphating layer), and a solid lubricating layer. The shaft body is made of medium carbon steel and has a mating surface for mounting the piston or bearing of the compressor. The phosphate layer is disposed on at least a portion of the mating surface, and the solid lubricating layer is disposed on the outer side of at least a portion of the phosphate layer.

[0027] In the aforementioned prior art, a phosphate layer and a lubricating layer are directly applied to the outside of medium carbon steel, resulting in low hardness of the medium carbon steel substrate supporting the lubricating layer and weak resistance to deformation. Consequently, the wear resistance of the crankshaft cannot meet the requirements of high-speed operation of the compressor.

[0028] In order to solve the technical problem of insufficient wear resistance of pump body components in the prior art, this application provides a pump body that can improve the wear resistance of pump body components.

[0029] like Figure 1 As shown, this application embodiment provides a pump body component, specifically a component that forms a friction surface with other components of the pump body through motion and friction. The entire surface or friction surface of this component is provided with a nitride layer. This nitride layer comprises two main parts: a penetrating layer 02 and a bright white layer 03. The penetrating layer 02 is located on the surface of the metal substrate 01 of the component and is the inner layer of the nitride layer. It can improve the adhesion between the surface and the interior of the component and enhance the corrosion resistance and wear resistance of the pump body component. The bright white layer 03 is located outside the penetrating layer 02, exhibiting a relatively bright white or off-white appearance. This layer has excellent wear resistance and can effectively reduce friction during long-term operation of the component, thereby extending the service life of the component and the pump body.

[0030] By adding a nitride layer to the surface of components or friction surfaces, the wear resistance of the components is significantly improved. Furthermore, under high-load operation, it effectively reduces heat accumulation caused by friction, thus minimizing efficiency losses due to wear. In addition, the presence of the nitride layer improves the pump body's corrosion resistance during long-term operation, especially when dealing with fluids containing corrosive substances, effectively extending the pump's service life and reducing the frequency of maintenance and replacement.

[0031] It should be noted that the formation of the nitride layer typically employs gas nitriding. This involves introducing nitrogen gas into the surface of the component at a specific temperature, allowing the nitrogen to penetrate into the metal substrate (e.g., under high temperature, a nitrogen-containing atmosphere gradually penetrates from the surface into the iron substrate and reacts with Fe to form nitrides such as Fe3N and Fe4N). This results in a nitride layer with excellent mechanical properties and chemical stability. The presence of the nitride layer has minimal impact on the deformation of the component, thus not significantly altering its geometry or dimensions, ensuring that the pump body maintains good accuracy and performance under high pressure and high temperature operating conditions.

[0032] Specific process example: The component is nitrided using low-temperature gas soft nitriding or low-temperature ion treatment, with the temperature controlled within the range of 500~580℃ and the time controlled within 2~8 hours. This ensures that the deformation of the component (specifically, the machined precision part) is controlled within the range of 5~15μm, resulting in minimal deformation suitable for direct assembly and use. Additionally, the loose layer 04 (such as...) on the surface of the nitride layer is also treated.Figure 2 (As shown) Mechanical polishing or sandblasting should be performed to remove loose, hard particles, preventing them from falling into the compressor pump body and causing abrasive scratches on the pump parts.

[0033] In the embodiments of this application, the thickness of the nitride layer ranges from 20 to 80 μm. This thickness range ensures high wear resistance of the pump body components while avoiding unnecessary mechanical stress and performance loss caused by excessive layer thickness. Nitride layers within this range provide stable surface protection under various operating conditions, especially when the pump body needs to withstand high mechanical pressure, friction, and corrosive media, ensuring that the pump body always maintains high operating efficiency and a long service life.

[0034] To further improve the friction reduction properties of components with friction surfaces under oil lubrication, such as Figure 3 As shown, in the first embodiment of this application, a phosphating layer 05 is provided on part of the surface of the nitride layer (e.g., only at the friction surface of the component) or all of the surface. The phosphating layer 05 is composed of phosphate crystals and is attached to the surface of the bright white layer 03 of the nitride layer. The material of the phosphate crystal layer can be zinc phosphate, iron phosphate, or manganese phosphate, preferably zinc phosphate, i.e., a zinc phosphate salt crystal layer. The porous microstructure of the phosphating layer 05 can effectively adsorb and store lubricating media, establishing a stable oil film in the early stage of pump operation and reducing the risk of dry friction during the start-up phase. This layer is tightly bonded to the nitride layer, does not disrupt the hardness distribution of the underlying layer, and enhances corrosion resistance, especially significantly improving component durability under humid or trace impurity conditions.

[0035] In the embodiments of this application, the thickness of the phosphating layer 05 is controlled within the range of 2 to 5 μm to ensure that it provides sufficient lubrication and oil storage capacity and corrosion protection without introducing additional dimensional deviations. This thickness range can form a continuous and dense crystalline film layer, while avoiding the risk of increased brittleness or peeling due to excessive thickness. It is particularly suitable for the surface of components in the pump body that require precision fit, preventing microcracks caused by thermal expansion and contraction or high-frequency vibration, and ensuring the dimensional stability and surface integrity of the pump body during long-term high-speed operation.

[0036] In the second embodiment of this application, a lubricating layer 07 is provided on the entire surface or part of the nitride layer (e.g., only at the friction surface of the component), directly covering the bright white layer 03 to form a low-friction working interface, further achieving the effect of friction reduction and reducing the frictional power consumption between the friction pairs of the pump body components. Specifically, the lubricating layer 07 can be composed of a solid lubricating material, possessing self-lubricating properties, which can reduce direct contact between moving parts under conditions without oil supply. Thus, the lubricating layer 07 can play a friction-reducing role during pump start-up, low-speed operation, or intermittent operation, improving overall efficiency and reducing energy consumption, achieving long-term maintenance-free operation.

[0037] In a further embodiment of this application, a roughening layer 06 is provided between the lubricating layer 07 and the nitride layer, which can increase the interfacial contact area and thus enhance the bonding between the lubricating layer 07 and the underlying layer (nitride layer). Specifically, the roughening layer 06 can be generated on the surface of the bright white layer 03 of the nitride layer through controlled sandblasting or chemical etching. The presence of the roughening layer 06 effectively prevents the lubricating layer 07 from slipping or peeling off under high shear force or periodic impact, further extending the effective cycle of the self-lubricating function of various pump components and ensuring that the pump maintains stable low-friction performance even under extreme operating conditions.

[0038] like Figure 4 As shown, in the third embodiment of this application, the surface of the composite layer composed of the nitride layer and the phosphating layer 05 is further covered with a lubricating layer 07. This lubricating layer 07 can be directly attached to the porous crystalline network of the phosphating layer 05, and the porous structure of the phosphating layer 05 can enhance the anchoring ability of the lubricating layer 07, giving the component good anti-peeling properties and thermal stability. It can maintain complete coverage even under high-frequency reciprocating motion, significantly reducing frictional temperature rise and wear rate, and ensuring long-term stable operation of the pump body under conditions of insufficient or intermittent lubrication.

[0039] In the embodiments of this application, the lubricating layer 07 is made of molybdenum disulfide, tungsten disulfide, or polytetrafluoroethylene, and the specific material properties can be selected according to the working conditions. Wherein: Molybdenum disulfide has an excellent layered structure and high load-bearing capacity, making it suitable for high-pressure and high-speed contact areas; tungsten disulfide has better thermal stability and can maintain a low coefficient of friction even at high temperatures; polytetrafluoroethylene provides extremely low surface energy and strong anti-adhesion properties, effectively inhibiting media adhesion and particle accumulation.

[0040] In the embodiments of this application, the thickness of the lubricating layer 07 is controlled between 2-10 μm to ensure that it provides sufficient friction reduction without affecting the mating clearance and component dimensional accuracy. Simultaneously, this thickness range is sufficient to form a continuous and complete lubricating film layer, isolating the metal contact surface and avoiding the risk of adhesion stress concentration or interlayer delamination due to excessive thickness. Furthermore, this thickness range matches the structure of the roughening layer 06 and the pore depth of the phosphating layer 05, ensuring that the pump body maintains a low-friction, low-wear, and low-vibration state under complex operating conditions.

[0041] This application also proposes a pump body having multiple components with relative motion and frictional contact, wherein at least one of the components is the aforementioned component with an added nitride layer. Preferably, all multiple components are components with added nitride layers, specifically the nitride layer is added at the friction surface, or a nitride layer, phosphide layer, etc. This can significantly reduce the frictional resistance and surface wear of the components during operation, thereby improving the transmission efficiency and service life of the pump body, and enabling the pump body to maintain stable and reliable performance under continuous high-intensity working conditions.

[0042] like Figure 5 , 6 As shown in Figures 7 and 8, in the embodiments of this application, the pump body includes a plurality of components with kinematic frictional contact, including a cylinder seat 10, a piston 50, a crankshaft 30, and a connecting rod 60, and friction pairs are formed between the components, wherein: The cylinder block 10 has a shaft hole 12 in the middle to support the rotation of the crankshaft 30 and maintain its axial positioning. It also has an annular groove around the shaft hole 12 for mounting the flat rolling bearing 20. The cylinder 11 is located in the inner cavity on the left side of the cylinder block 10. The piston 50 reciprocates linearly inside the cylinder 11, forming a sliding friction interface with the inner wall of the cylinder 11. The piston surface 51 (i.e., the outer surface) of the piston 50 has a mounting hole for inserting the piston pin 70. The inner wall of the piston 50 has a pin seat, and the piston pin 70 can be fixed inside the piston 50 by installing a snap ring pin 80 on the pin seat. The crankshaft 30 passes through the shaft hole 12 of the cylinder block 10 and cooperates with the flat rolling bearing 20. Its crank 32 (eccentric part) is connected to the piston 50 through the connecting rod 60 to realize the conversion between rotational motion and reciprocating motion. The two ends of the connecting rod 60 are hinged to the crank 32 of the crankshaft 30 and the piston pin 70, respectively, to continuously transmit power under high-frequency alternating load. The aforementioned components constitute a complete transmission chain. Their mating surfaces are subjected to high-frequency impacts and sliding friction during operation. By adding nitride layers or further adding phosphating layers 05 and lubricating layers 07 to these friction surfaces, the frictional resistance and surface wear between components can be significantly reduced, thereby improving the pump body's transmission efficiency and service life, and enabling the pump body to maintain stable and reliable performance under continuous high-intensity working conditions.

[0043] The following is a detailed description of some components of the pump body, showing the location of their friction surfaces.

[0044] like Figure 8 , 9 As shown, the crankshaft 30 specifically includes a long shaft 31 and a crank 32 located on the end platform of the long shaft 31 and offset from the axis of the long shaft 31. In addition, a counterweight 40 can be installed on the end platform of the long shaft 31 to increase the rotational inertia during rotation. The outer surface of the crank 32 is the main friction surface. In addition, there may be friction surfaces on the long shaft 31 that may be in contact with flanges, etc.

[0045] like Figure 5 , 7 As shown, the piston surface 51 of the piston 50 and the inner wall of the cylinder 11 form a friction pair, which is its main friction surface. In addition, the mating structure of the piston pin 70 and the snap ring pin 80 inside is not the focus of this application. Those skilled in the art can easily deduce its installation and mating method from the drawings, so it will not be described in detail.

[0046] like Figures 10 to 14As shown in the embodiment of this application, the connecting rod 60 includes: a rod portion 63 and a first bushing 62 and a second bushing 61 respectively disposed at both ends of the rod portion 63. The first bushing 62 cooperates with the piston pin 70, and the second bushing 61 cooperates with the crank 32 of the crankshaft 30. The two bushings respectively bear reciprocating impact and rotational sliding load. An oil passage 64 is provided through the rod portion 63 along its length, connecting the inner wall of the first bushing 62 and the inner wall of the second bushing 61 to form a closed lubrication channel, so that lubricating oil can be continuously delivered from the crankshaft side to the piston end. The first bushing 62 has annularly arranged end face oil grooves 66 on both axial end faces, and its inner wall has spirally arranged (or other shapes, such as straight grooves) inner wall oil grooves 65. The middle position of the inner wall oil grooves 65 directly connects to the oil passage 64, and the two ends extend axially, respectively communicating with the end face oil grooves 66 at both ends of the first bushing 62, so that the lubricating oil is evenly distributed on the inner wall of the bushing and diffuses axially until it reaches the end face. This structure enables bidirectional supply and circumferential distribution of the lubricating medium, maintaining a stable oil film even under high-frequency oscillation and local high-pressure conditions, preventing dry metal friction, effectively reducing temperature rise and wear, and improving the durability and operational stability of the connecting rod 60 under extreme working conditions.

[0047] In the embodiments of this application, the cylinder block 10 is preferably made of gray cast iron, the crankshaft 30 is preferably made of ductile iron, the piston 50 is preferably made of iron-based powder metallurgy material, and the connecting rod 60 is preferably made of iron-based powder metallurgy material. The surface hardness of the nitride layer on the cylinder block 10, the crankshaft 30, the piston 50, and the connecting rod 60 is increased to 400-700 HV, ensuring the reliability of each component during long-term compressor operation.

[0048] In a specific embodiment, after the cylinder seat 10, crankshaft 30, piston 50 and connecting rod 60 are nitrided to add nitride layers, the deformation of the workpiece (specifically, precision parts) is controlled within the range of 5~15μm. The deformation of the parts within this range is within the process controllable range, and they can be directly assembled and used in the future, avoiding increased production costs.

[0049] This application also proposes a compressor, including the pump body described above. Preferably, the compressor is a piston compressor.

[0050] The surfaces or friction surfaces of the pump body components of the compressor are treated with nitride layers, or a combination of nitride layers, phosphating layers, and lubricating layers, which improves the wear resistance of the pump body components. In addition, the addition of the lubricating layer can achieve a self-lubricating effect, enabling the compressor to maintain low friction power consumption even under high-frequency operation.

[0051] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0052] Although terms such as "first," "second," etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0053] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A pump body component, said component having a friction surface, characterized in that, The entire surface or friction surface of the component is provided with a nitride layer; the nitride layer includes a penetrating layer and a whitening layer starting from the inside out on the surface of the component.

2. The pump body component according to claim 1, characterized in that, The thickness of the nitride layer ranges from 20 to 80 μm.

3. The pump body component according to claim 1, characterized in that, A phosphating layer is provided on part or all of the surface of the nitride layer.

4. The pump body component according to claim 3, characterized in that, The thickness of the phosphating layer ranges from 2 to 5 μm.

5. The pump body component according to claim 1, characterized in that, The entire surface or part of the surface of the nitride layer is provided with a lubricating layer.

6. The pump body component according to claim 5, characterized in that, A roughening layer is provided between the lubricating layer and the nitride layer.

7. The pump body component according to claim 3, characterized in that, The entire surface or part of the surface of the composite layer consisting of the nitride layer and the phosphating layer is provided with a lubricating layer.

8. The pump body component according to claim 5 or 7, characterized in that, The lubricating layer is one of the following lubricating substances: molybdenum disulfide, tungsten disulfide, and polytetrafluoroethylene.

9. The pump body component according to claim 5 or 7, characterized in that, The thickness of the lubricating layer ranges from 2 to 10 μm.

10. A pump body comprising multiple components, characterized in that, At least one of the plurality of components is a pump body component as described in any one of claims 1 to 9.

11. The pump body according to claim 10, characterized in that, The plurality of components include: a cylinder seat with a shaft bore, a piston mounted in a cylinder in the cylinder seat, a crankshaft mounted on the cylinder seat and passing through the shaft bore, and a connecting rod connecting the crankshaft and the piston.

12. The pump body according to claim 11, characterized in that, The connecting rod includes: a rod portion, and a first bushing that cooperates with the piston and a second bushing that cooperates with the crankshaft, respectively disposed at both ends of the rod portion; the rod portion is provided with an oil passage connecting the inner wall of the first bushing and the inner wall of the second bushing; the first bushing is provided with end face oil grooves on two axial end faces, and the inner wall is provided with an inner wall oil groove that connects the oil passage with the two end face oil grooves.

13. A compressor, characterized in that, Includes the pump body as described in any one of claims 10 to 12.

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