Pump body assembly, compressor and refrigeration equipment

Abstract

The invention discloses a pump body assembly, a compressor and refrigeration equipment, and relates to the technical field of compressors, the pump body assembly comprises an air cylinder, a pump body, a pump body, a pump body, a pump body and a pump body, and the air cylinder is provided with a working cavity and a sliding groove communicated with the working cavity; the piston is eccentrically and rotatably arranged in the working cavity; the sliding piece comprises a sliding piece body and a hinge portion arranged at one end of the sliding piece body, the sliding piece body is arranged in the sliding groove in a sliding mode, the hinge portion is hinged to the piston and provided with a first opposite-grinding face, the piston is provided with a second opposite-grinding face in contact with the first opposite-grinding face, and the second opposite-grinding face is provided with a second opposite-grinding face in contact with the second opposite-grinding face. The surface hardness of the first counter-grinding surface is at least 30% higher than that of the second counter-grinding surface. According to the technical scheme, adhesive abrasion can be effectively reduced, and the problem that abrasion of a hinge structure is aggravated is solved.

Description

Technical Field

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

[0002] In compressors with traditional structures, the end of the vane closest to the piston is usually in contact with the piston, and there is no connection between the vane and the piston. This structure is prone to gas leakage and produces a large vane noise, resulting in low compressor energy efficiency and reliability. In related technologies, compressors with hinged structures hinge the vane and the piston, which can effectively reduce gas leakage during gas compression, improve vane noise, and enhance compressor energy efficiency and reliability compared to compressors with traditional structures. However, at the same time, the suction side of the hinged structure is also under greater pressure, and during the long-term operation of the compressor, the local wear of the hinged structure is prone to increase, affecting the performance and service life of the compressor. Summary of the Invention

[0003] The main purpose of the present invention is to propose a vane, a compressor and a refrigeration device, aiming to solve the technical problem that during the long-term operation of an articulated compressor, local wear of the articulated structure is prone to increase, affecting the performance and service life of the compressor.

[0004] To achieve the above-mentioned purpose, the pump assembly proposed by the present invention includes:

[0005] A cylinder having a working chamber and a slide groove communicating with the working chamber;

[0006] a piston eccentrically rotatably disposed in the working chamber; and

[0007] The slide comprises a slide body and a hinged portion provided at one end of the slide body, wherein the slide body is slidably provided in the slide groove, the hinged portion is hinged to the piston, the hinged portion has a first pair of grinding surfaces, and the piston has a second pair of grinding surfaces in contact with the first pair of grinding surfaces, and the surface hardness of the first pair of grinding surfaces is at least 30% higher than the surface hardness of the second pair of grinding surfaces.

[0008] In one embodiment, the surface hardness of the first pair of grinding surfaces is 30% higher than the surface hardness of the second pair of grinding surfaces.

[0009] In one embodiment, the outer wall of the piston is provided with a hinge groove, the hinge part is provided in the hinge groove, the side of the hinge part in contact with the inner wall of the hinge groove forms the first pair of grinding surfaces, and the inner wall of the hinge groove forms the second pair of grinding surfaces.

[0010] In one embodiment, the piston is made of a metal material that has not been heat-treated.

[0011] In one embodiment, the piston is made of gray cast iron that has not been heat-treated.

[0012] In one embodiment, the piston is made of HT300 gray cast iron that has not been heat treated;

[0013] Alternatively, the element composition and mass percentage of the piston include: carbon: 2.9% to 3.2%, silicon: 1.4% to 1.8%, manganese: 0.8% to 1.2%, phosphorus: ≤0.15%, sulfur: ≤0.12%, and alloying elements.

[0014] In one embodiment, the hardness of the piston is not less than 15HRC and not more than 25HRC;

[0015] And / or, the roughness Rz of the second pair of grinding surfaces is not greater than 1.6 microns.

[0016] In one embodiment, the hinge portion is provided with a DLC coating, and the DLC coating forms the first counter-grinding surface.

[0017] The present invention further provides a compressor, comprising:

[0018] crankshaft;

[0019] The pump assembly as described above, wherein the piston is sleeved on the periphery of the crankshaft; and

[0020] A motor is connected to the crankshaft for driving the crankshaft to rotate, thereby driving the piston to rotate eccentrically in the working chamber.

[0021] The present invention also provides a refrigeration device comprising the compressor as described above.

[0022] The technical solution of the present invention hinges the vane to the piston via a hinged portion, increasing the rigidity of the connection between the vane and piston. This effectively reduces gas leakage during compression, improves vane noise, and enhances compressor energy efficiency and reliability. Furthermore, the hinged portion has a first pair of grinding surfaces, and the piston has a second pair of grinding surfaces in contact with the first pair of grinding surfaces. The surface hardness of the first pair of grinding surfaces is at least 30% higher than that of the second pair of grinding surfaces. This creates a significant hardness difference between the first and second pairs of grinding surfaces. By increasing the hardness difference between the vane and piston grinding surfaces, adhesive wear can be effectively reduced, addressing the problem of increased wear in the hinged structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 A schematic structural diagram of an embodiment of a pump assembly provided by the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the middle piston;

[0026] Figure 3 for Figure 1 Schematic diagram of the structure of the middle slide.

[0027] Description of Figure Numbers:

[0028] 100. Pump body assembly;

[0029] 10. Cylinder; 20. Piston; 21. Articulated groove; 211. Second pair of grinding surfaces; 30. Sliding vane; 31. Sliding vane body; 32. Articulated portion; 321. First pair of grinding surfaces.

[0030] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] A rolling rotor compressor generally includes a motor, a crankshaft, and a pump body assembly, wherein the pump body assembly includes a cylinder, a piston, and a vane. The cylinder has a working chamber and a chute connected to the working chamber. The piston is rotatably disposed in the working chamber, and the vane is slidably disposed in the chute. One end of the vane cooperates with the piston, which is sleeved on the outer periphery of the eccentric portion of the crankshaft. One end of the crankshaft is connected to the output shaft of the motor. When the compressor is working, the motor drives the crankshaft to rotate, and the eccentric portion of the crankshaft drives the piston to rotate eccentrically in the working chamber of the cylinder. As the piston rotates eccentrically, the vane can be driven to move along the chute. The working chamber can be divided into an intake chamber and a compression chamber by the vane and the piston. The intake chamber has an intake port, and the compression chamber has an exhaust port. As the piston rotates, the volume of the exhaust chamber and the intake chamber changes, thereby realizing the intake, compression, and exhaust processes, thereby compressing the working medium.

[0035] In a compressor with a traditional structure, the end of the vane closest to the piston usually abuts the piston, and there is no connection between the vane and the piston. This structure is prone to gas leakage and produces a loud vane noise, resulting in low compressor energy efficiency and reliability.

[0036] In related technologies, hinged compressors hinge the vanes and pistons. Compared to traditional compressors, this can effectively reduce gas leakage during compression, improve vane noise, and enhance compressor energy efficiency and reliability. However, the hinged structure also places greater pressure on the suction side. During long-term operation, the hinged structure is prone to increased local wear, affecting the compressor's performance and service life. Therefore, higher requirements are placed on the wear resistance and lubricity of the hinged surface.

[0037] Based on this, the present invention proposes a pump body assembly 100, which forms an articulated structure by hingedly connecting the vane 30 and the piston 20 to improve the gas leakage problem caused by the traditional vane 30 structure, improve the vane noise and enhance the energy efficiency and reliability of the compressor. In addition, by increasing the hardness difference between the grinding surfaces of the piston 20 and the vane 30, the adhesive wear is reduced, thereby solving the problem of increased wear of the articulated structure.

[0038] See also Figures 1 to 3 In one embodiment of the present invention, the pump assembly 100 includes a cylinder 10, a piston 20, and a vane 30. The cylinder 10 has a working chamber and a chute communicating with the working chamber; the piston 20 is eccentrically rotatably disposed in the working chamber; the vane 30 includes a vane body 31 and a hinged portion 32 disposed at one end of the vane body 31. The vane body 31 is slidably disposed in the chute. The hinged portion 32 is hingedly connected to the piston 20. The hinged portion 32 has a first pair of grinding surfaces 321. The piston 20 has a second pair of grinding surfaces 211 in contact with the first pair of grinding surfaces 321. The surface hardness of the first pair of grinding surfaces 321 is at least 30% higher than that of the second pair of grinding surfaces 211.

[0039] The pump body assembly 100 can be applied to a compressor. The piston 20 is eccentrically rotatable and is arranged in the working chamber and is connected to the eccentric part of the crankshaft of the compressor. When the compressor is working, the crankshaft is driven to rotate by the motor, and then the eccentric part of the crankshaft drives the piston 20 to rotate eccentrically in the working chamber of the cylinder 10. As the piston 20 rotates eccentrically, the slide 30 can be driven to move along the slide groove. The working chamber can be divided into an intake chamber and a compression chamber by the slide 30 and the piston 20. The intake chamber has an intake port, and the compression chamber has an exhaust port. As the piston 20 rotates, the volume of the exhaust chamber and the intake chamber changes, thereby realizing the intake, compression, and exhaust processes, thereby realizing the compression of the working medium.

[0040] The slide body 31 and the hinge portion 32 of the slide 30 can be an integrally formed structure, or can be separately formed and then assembled. Optionally, the slide body 31 and the hinge portion 32 are an integrally formed structure, which makes the manufacturing process simpler and the overall structural strength higher. The materials of the slide body 31 and the hinge portion 32 can be the same or different. Optionally, the slide body 31 and the hinge portion 32 are both made of metal materials, for example, stainless steel (such as 11Cr17 stainless steel) or high-speed steel (such as M2 high-speed steel) can be used. There are various ways in which the hinge portion 32 is hinged to the piston 20. For example, the outer peripheral wall of the piston 20 is provided with a hinge groove 21, and the hinge portion 32 is hinged in the hinge groove 21. For another example, the outer peripheral wall of the piston 20 is provided with a convex portion, and the hinge portion 32 is provided with a groove, and the convex portion is hinged in the groove.

[0041] The hinge 32 has a first pair of grinding surfaces 321, and the piston 20 has a second pair of grinding surfaces 211 that contact the first pair of grinding surfaces 321. When the piston 20 drives the vane 30, the first pair of grinding surfaces 321 and the second pair of grinding surfaces 211 come into contact and rub against each other. Research has found that in conventional articulated compressors, the hardness of the first pair of grinding surfaces 321 and the second pair of grinding surfaces 211 are relatively close, making adhesive wear more likely. This is because when the hardness of the two grinding surfaces is similar, adhesion and material transfer may occur between them, leading to more severe adhesive wear. Furthermore, similar materials (especially similar metals with similar hardness) are more prone to atomic interdiffusion or cold welding (adhesion effect) during friction, further exacerbating wear of the hinged structure. Adhesive wear refers to the adhesion (cold welding) of the material surfaces caused by local high pressure and frictional heat when two contacting solid surfaces slide or roll relative to each other. Subsequently, shearing causes material to transfer from one surface to the other, even forming wear debris.

[0042] In this embodiment, the surface hardness of the first pair of grinding surfaces 321 is at least 30% higher than that of the second pair of grinding surfaces 211. That is, the first pair of grinding surfaces 321 is made of a harder material with a higher hardness, while the second pair of grinding surfaces 211 is made of a softer material with a lower hardness, resulting in a significant hardness difference between the first pair of grinding surfaces 321 and the second pair of grinding surfaces 211. For example, the surface hardness of the first pair of grinding surfaces 321 is 30%, 35%, 40%, and so on, higher than that of the second pair of grinding surfaces 211. When the hardness difference between the two grinding surfaces is large, the softer material is more likely to undergo plastic deformation, while the harder material remains relatively stable. The softer material is more likely to deform under pressure, increasing the actual contact area but reducing the local contact stress. This reduces shear force at the interface, thereby reducing the probability of adhesive wear. Furthermore, increasing the hardness difference generally also means that the material composition or crystal structure is different, thereby reducing the tendency to adhesive wear.

[0043] In practical applications, the vane 30 can be made of a material with a higher hardness, while the piston 20 can be made of a material with a relatively lower hardness to increase the hardness difference between the two grinding surfaces. Alternatively, the main structure of the vane 30 and the piston 20 can be made of the same material, with only the grinding surfaces of the two being treated differently. For example, a DLC coating (diamond-like carbon coating) can be applied to the surface of the vane 30 to increase the hardness of the first pair of grinding surfaces 321. By not heat treating the piston 20, the hardness of the second pair of grinding surfaces 211 can be appropriately reduced.

[0044] The technical solution of the present invention hinges the vane 30 to the piston 20 via a hinged portion 32, which increases the rigidity of the connection between the vane 30 and the piston 20, effectively reducing gas leakage during gas compression, improving vane noise, and enhancing the energy efficiency and reliability of the compressor. Furthermore, the hinged portion 32 has a first pair of grinding surfaces 321, and the piston 20 has a second pair of grinding surfaces 211 that contact the first pair of grinding surfaces 321. The surface hardness of the first pair of grinding surfaces 321 is at least 30% higher than that of the second pair of grinding surfaces 211. This creates a significant hardness difference between the first pair of grinding surfaces 321 and the second pair of grinding surfaces 211. By increasing the hardness difference between the grinding surfaces of the vane 30 and the piston 20, adhesive wear can be effectively reduced, addressing the problem of increased wear of the hinged structure.

[0045] Optionally, the surface hardness of the first pair of grinding surfaces 321 is 30% higher than the surface hardness of the second pair of grinding surfaces 211. This creates a certain hardness difference between the first pair of grinding surfaces 321 and the second pair of grinding surfaces 211, which can reduce adhesive wear between the two grinding surfaces. This also prevents an excessively large hardness difference between the first pair of grinding surfaces 321 and the second pair of grinding surfaces 211, which could lead to increased wear of the second pair of grinding surfaces 211 and shorten the service life of the piston 20.

[0046] like Figures 1 to 3 As shown, in one embodiment, the outer circumferential wall of the piston 20 is provided with a hinge groove 21, and the hinge portion 32 is disposed within the hinge groove 21. The surface of the hinge portion 32 that contacts the inner circumferential wall of the hinge groove 21 forms the first grinding surface 321, while the inner circumferential wall of the hinge groove 21 forms the second grinding surface 211. In this embodiment, the slide 30 is hingedly connected to the hinge groove 21 of the piston 20 via the hinge portion 32, resulting in a simple structure and ensuring assembly stability between the slide 30 and the piston 20. Optionally, the hinge groove 21 is an arcuate groove with a notch, and the outer circumferential profile of the hinge portion 32 is an arcuate surface that matches the inner circumferential profile of the hinge groove 21. The surface hardness of the hinge portion 32 of the slide 30 is at least 30% higher than the hardness of the wall of the hinge groove 21 of the piston 20, creating a significant hardness difference and thereby reducing adhesive wear.

[0047] In one embodiment, the piston 20 is made of a metal material that has not undergone heat treatment. For example, the piston 20 can be made of a metal material such as cast iron or alloy steel that has not undergone heat treatment. This ensures a certain degree of rigidity and wear resistance. Furthermore, compared to a heat-treated piston 20, the surface hardness of the unheat-treated piston 20 is lower, which helps increase the hardness difference between the piston 20 and the sliding vane 30, thereby reducing adhesive wear.

[0048] Optionally, the piston 20 is made of unheat-treated gray cast iron. Gray cast iron refers to cast iron containing flaky graphite. It is so-called gray cast iron because of its dark gray fracture surface. Its main components are iron, carbon, silicon, manganese, sulfur, and phosphorus. Due to its excellent casting properties, gray cast iron is suitable for complex castings, facilitating the casting of relatively complex pistons 20. Furthermore, the graphite in gray cast iron is self-lubricating, enhancing the wear resistance and lubricity of the piston 20.

[0049] Gray cast iron can be selected from different grades according to its tensile strength and hardness, including but not limited to HT150 gray cast iron, HT200 gray cast iron, HT250 gray cast iron, HT300 gray cast iron, etc.

[0050] Optionally, the piston 20 may be made of unheat-treated HT300 gray cast iron. HT300 is a high-strength grade of gray cast iron, with a matrix composed primarily of pearlite and fine, evenly distributed graphite flakes. Using unheat-treated HT300 gray cast iron to manufacture the piston 20 improves its strength and wear resistance, further reducing localized wear of the hinged structure and extending the service life of the pump assembly 100 and the compressor.

[0051] Optionally, the element composition and mass percentage of the piston 20 include: carbon: 2.9% to 3.2%, silicon: 1.4% to 1.8%, manganese: 0.8% to 1.2%, phosphorus: ≤0.15%, sulfur: ≤0.12%, and alloy elements.

[0052] In this embodiment, the elemental composition of the piston 20 includes carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), and other alloying elements. Carbon forms graphite flakes, providing lubricity and shock absorption. The carbon content is moderate, ranging from 2.9% to 3.2% by mass, to avoid excessive carbon that reduces strength. For example, the carbon content can be 2.9%, 3.0%, 3.1%, 3.2%, etc. Silicon promotes graphitization, refines graphite flakes, and improves lubrication. The silicon content is moderate, ranging from 1.4% to 1.8%, resulting in a moderate silicon-carbon ratio that balances graphitization and matrix strength. For example, the silicon content can be 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, etc. Manganese stabilizes pearlite, increasing strength and hardness. The manganese content is moderate, ranging from 0.8% to 1.2%, resulting in a moderate manganese-sulfur ratio that effectively suppresses sulfur's hot brittleness. For example, the mass percentage of manganese can be 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, etc. An appropriate amount of phosphorus can form a phosphorus eutectic, improving hardness and wear resistance. Furthermore, the phosphorus content should not exceed 0.15%, thus avoiding the increased brittleness caused by excessive phosphorus content. For example, the phosphorus content can be 0.1%, 0.11%, 0.12%, 0.13%, 0.14%, 0.15%, etc. An appropriate amount of sulfur can shorten the length and blunt the ends of graphite in gray cast iron, improve the graphite morphology in gray cast iron, and enhance the mechanical properties of the casting. The sulfur content should not exceed 0.12%. For example, the sulfur content can be 0.1%, 0.11%, 0.12%, etc. Furthermore, the addition of trace alloying elements can increase the pearlite content and refine the graphite. These alloying elements can include chromium (Cr), copper (Cu), molybdenum (Mo), etc.

[0053] In conventional articulated compressors, the hardness of the piston is generally 45HRC-55HRC, which is close to the hardness of the sliding vane 30 and is prone to adhesive wear.

[0054] In one embodiment, the hardness of the piston 20 is not less than 15HRC and not more than 25HRC. In this embodiment, the hardness of the piston 20 is between 15HRC and 25HRC, which is lower than the hardness of a conventional piston 20. This creates a certain hardness difference between the grinding surfaces of the piston 20 and the sliding plate 30, effectively reducing adhesive wear and preventing increased wear of the hinge structure. The hardness of the piston 20 can be 15HRC, 16HRC, 17HRC, 18HRC, 19HRC, 20HRC, 21HRC, 22HRC, 23HRC, 24HRC, 25HRC, etc.

[0055] In one embodiment, the roughness Rz of the second pair of grinding surfaces 211 is no greater than 1.6 microns. That is, the roughness Rz of the second pair of grinding surfaces 211 is ≤ 1.6 μm. For example, the roughness of the groove wall surface of the hinge groove 21 of the piston 20 is no greater than 1.6 microns. In this way, the actual contact area between the second pair of grinding surfaces 211 and the first pair of grinding surfaces 321 can be increased, reducing local stress concentration, thereby reducing the friction coefficient, reducing wear, and further extending the service life of the compressor. For example, the roughness of the second pair of grinding surfaces 211 can be 1 micron, 1.1 microns, 1.2 microns, 1.3 microns, 1.4 microns, 1.5 microns, 1.6 microns, etc.

[0056] In one embodiment, the hinge portion 32 is provided with a DLC coating, which forms the first pair of grinding surfaces 321. In this embodiment, providing a DLC coating on the hinge portion 32 of the sliding vane 30 to form the second pair of grinding surfaces 211 helps increase the hardness of the first pair of grinding surfaces 321, thereby further increasing the hardness difference between the first pair of grinding surfaces 321 and the second pair of grinding surfaces 211, thereby effectively reducing adhesive wear. Furthermore, providing a DLC coating on the hinge portion 32 of the sliding vane 30 provides the first pair of grinding surfaces 321 of the sliding vane 30 with improved wear resistance and lubricity, thereby reducing wear on the sliding vane 30 and extending its service life.

[0057] DLC (Diamond-Like Carbon Coating) is an amorphous functional coating composed of carbon atoms that combines the excellent properties of diamond's hardness with graphite's lubricity. DLC coatings can be applied to the counter-polishing surface through surface treatment processes such as physical vapor deposition (PVD), plasma-enhanced chemical vapor deposition (PECVD), ion beam-assisted deposition (IBAD), cathodic arc deposition (CAD), and pulsed laser deposition (PLD).

[0058] The present invention also provides a compressor, which includes a crankshaft, a pump assembly 100, and a motor. The pump assembly 100 includes a cylinder 10, a piston 20, and a vane 30. The cylinder 10 has a working chamber and a chute communicating with the working chamber. The piston 20 is eccentrically rotatable within the working chamber. The vane 30 includes a vane body 31 and a hinged portion 32 disposed at one end of the vane body 31. The vane body 31 is slidably disposed within the chute. The hinged portion 32 is hingedly connected to the piston 20. The hinged portion 32 has a first pair of grinding surfaces 321. The piston 20 has a second pair of grinding surfaces 211 in contact with the first pair of grinding surfaces 321. The surface hardness of the first pair of grinding surfaces 321 is at least 30% higher than that of the second pair of grinding surfaces 211. The piston 20 is sleeved on the outer periphery of the crankshaft. The motor is drivingly connected to the crankshaft, and is configured to drive the crankshaft to rotate, thereby driving the piston 20 to eccentrically rotate within the working chamber.

[0059] When the compressor is working, the motor drives the crankshaft to rotate, and then the eccentric part of the crankshaft drives the piston 20 to rotate eccentrically in the working chamber of the cylinder 10. As the piston 20 rotates eccentrically, the slide 30 can be driven to move along the slide groove. The working chamber can be divided into an intake chamber and a compression chamber by the slide 30 and the piston 20. The intake chamber has an intake port, and the compression chamber has an exhaust port. As the piston 20 rotates, the volume of the exhaust chamber and the intake chamber changes, thereby realizing the intake, compression, and exhaust processes, thereby realizing the compression of the working medium.

[0060] The technical solution of the present invention utilizes a compressor with an articulated structure, in which the vane 30 is hingedly connected to the piston 20 via a hinge 32. This increases the rigidity of the connection between the vane 30 and the piston 20, effectively reducing gas leakage during gas compression, improving vane noise, and enhancing the energy efficiency and reliability of the compressor. Furthermore, the hinge 32 has a first pair of grinding surfaces 321, and the piston 20 has a second pair of grinding surfaces 211 that contact the first pair of grinding surfaces 321. The surface hardness of the first pair of grinding surfaces 321 is at least 30% higher than that of the second pair of grinding surfaces 211. This creates a significant hardness difference between the first pair of grinding surfaces 321 and the second pair of grinding surfaces 211. By increasing the hardness difference between the grinding surfaces of the vane 30 and the piston 20, adhesive wear can be effectively reduced, addressing the problem of increased wear of the articulated structure.

[0061] The specific structure of the pump assembly 100 is similar to the above-mentioned embodiments. Since this compressor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described in detail here. The compressor can be a vertical compressor or a horizontal compressor. The compressor includes but is not limited to a single-cylinder rotary compressor having a single cylinder 10, or a multi-cylinder rotary compressor having multiple cylinders 10.

[0062] The present invention also provides a refrigeration device including a compressor. The specific structure of the compressor is similar to that of the above-described embodiments. Since this refrigeration device utilizes all the technical solutions of all of the above-described embodiments, it at least possesses all the beneficial effects of the technical solutions of the above-described embodiments, and therefore will not be further elaborated here. Refrigeration devices include, but are not limited to, refrigerators, integrated air conditioners, split air conditioners, ducted air conditioners, window air conditioners, and other equipment.

[0063] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the scope of protection of the present invention.

Claims

1. A pump assembly, characterized in that: include: A cylinder having a working chamber and a slide groove communicating with the working chamber; a piston eccentrically rotatably disposed in the working chamber; as well as The slide comprises a slide body and a hinged portion provided at one end of the slide body, wherein the slide body is slidably provided in the slide groove, the hinged portion is hinged to the piston, the hinged portion has a first pair of grinding surfaces, and the piston has a second pair of grinding surfaces in contact with the first pair of grinding surfaces, and the surface hardness of the first pair of grinding surfaces is at least 30% higher than the surface hardness of the second pair of grinding surfaces.

2. The pump assembly according to claim 1, wherein: The surface hardness of the first pair of grinding surfaces is 30% higher than the surface hardness of the second pair of grinding surfaces.

3. The pump assembly according to claim 1, wherein: The outer peripheral wall of the piston is provided with a hinge groove, the hinge part is provided in the hinge groove, the side of the hinge part in contact with the inner peripheral wall of the hinge groove forms the first pair of grinding surfaces, and the inner peripheral wall of the hinge groove forms the second pair of grinding surfaces.

4. The pump assembly according to claim 1, wherein: The piston is made of a metal material that has not been subjected to heat treatment.

5. The pump assembly according to claim 4, wherein: The piston is made of gray cast iron that has not been subjected to heat treatment.

6. The pump assembly according to claim 4, wherein: The piston is made of HT300 grey cast iron without heat treatment; Alternatively, the element composition and mass percentage of the piston include: carbon: 2.9% to 3.2%, silicon: 1.4% to 1.8%, manganese: 0.8% to 1.2%, phosphorus: ≤0.15%, sulfur: ≤0.12%, and alloying elements.

7. The pump assembly according to claim 1, wherein: The hardness of the piston is not less than 15HRC and not more than 25HRC; And / or, the roughness Rz of the second pair of grinding surfaces is not greater than 1.6 microns.

8. The pump assembly according to any one of claims 1 to 7, characterized in that: The hinge portion is provided with a DLC coating, and the DLC coating forms the first pair of grinding surfaces.

9. A compressor, characterized in that: include: crankshaft; The pump assembly according to any one of claims 1 to 8, wherein the piston is sleeved on the periphery of the crankshaft; as well as A motor is connected to the crankshaft for driving the crankshaft to rotate, thereby driving the piston to rotate eccentrically in the working chamber.

10. A refrigeration device, characterized in that: Comprising the compressor of claim 9.

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