Cylinder block assembly, piston compressor, refrigerator

Abstract

The present invention provides a cylinder block assembly, a piston compressor, and a refrigerator. The cylinder block assembly includes a cylinder block and a crankshaft. The cylinder block has a crankshaft support cylinder, a sliding sleeve mounted within the crankshaft support cylinder, and the crankshaft is disposed within the sliding sleeve. The sliding sleeve has a lower hardness than the crankshaft support cylinder, and the sliding sleeve has a lower hardness than the crankshaft. By disposing a lower hardness sliding sleeve between the higher hardness crankshaft and the crankshaft support cylinder, the present invention effectively reduces frictional power consumption between the crankshaft and the crankshaft support cylinder, i.e., the cylinder block. This reduces the operating power consumption of the compressor, thereby improving the performance and long-term operational reliability of the compressor.

Description

Technical Field

[0001] The invention belongs to the technical field of compressor manufacturing, and in particular relates to a cylinder seat assembly, a piston compressor, and a refrigerator. Background Art

[0002] For a reciprocating piston compressor, the piston reciprocates inside the cylinder, compressing the refrigerant to do work. The compressed refrigerant is then transported to the outside of the compressor through the internal exhaust coil and finally enters the refrigerator's refrigeration cycle. As piston compressors gradually develop in the direction of wide-band and high-efficiency, the operating frequency of the compressor is getting higher and higher, which will also cause the centrifugal force generated by the eccentric crankshaft connecting the piston and the connecting rod to become larger and larger. This centrifugal force will cause the crankshaft rotating relative to the cylinder seat to tilt, thereby causing eccentric wear on the upper and lower ends of the crankshaft and the cylinder seat crankshaft support cylinder (see Figure 5 As shown in the figure, the friction power consumption increases and the performance of the compressor decreases; moreover, the mechanical vibration noise of the pump body is large. When the clearance between the crankshaft and the crankshaft support cylinder gradually increases due to wear, the stability of the pump body parts during operation gradually decreases and the operating noise of the compressor gradually increases. Summary of the Invention

[0003] Therefore, the present invention provides a cylinder block assembly, a piston compressor, and a refrigerator, which can solve the technical problems in the prior art that the crankshaft tilts under the action of centrifugal force, resulting in eccentric wear of the upper and lower ends of the cylinder block crankshaft support cylinder, increased friction power consumption of the compressor, and reduced compressor performance.

[0004] In order to solve the above problems, the present invention provides a cylinder seat assembly, including a cylinder seat and a crankshaft, the cylinder seat has a crankshaft support cylinder, a sliding sleeve is installed in the crankshaft support cylinder, the crankshaft is inserted into the sliding sleeve, the hardness of the sliding sleeve is less than the hardness of the crankshaft support cylinder, and the hardness of the sliding sleeve is less than the hardness of the crankshaft.

[0005] In some embodiments, the sliding sleeve is made of a polymer material with anti-friction and wear-resistant properties.

[0006] In some embodiments, the substrate of the polymer material with anti-friction and wear-resistant properties is at least one of polytetrafluoroethylene PTFE, polyamide PA, polyimide PAI, polycarbonate PC, polyphenylene sulfide PPS, polyetheretherketone PEEK, ultra-high molecular weight polyethylene UHMWPE, polytetrafluoroethylene PTFE, fluoroplastic, and phenolic resin; and / or the Shore hardness of the polymer material with anti-friction and wear-resistant properties is above 60.

[0007] In some embodiments, the high polymer material with friction-reducing and wear-resistant properties contains 2.0% to 8.0% of lubricating medium and 0.5% to 5.0% of wear-resistant particles.

[0008] In some embodiments, the lubricating medium is at least one of liquid crystal polymer LCP, polyoxymethylene POM, molybdenum disulfide MoS2, tungsten disulfide WS2, graphite, and graphene; and / or the wear-resistant particles are at least one of aluminum oxide Al2O3, zirconium oxide ZrO2, silicon carbide SiC, titanium carbide TiC, tungsten carbide WC, and cast stone.

[0009] In some embodiments, the crankshaft supporting cylinder and the sliding sleeve are interference fit.

[0010] In some embodiments, a circumferential limiting structure and / or an axial limiting structure is provided between the crankshaft support cylinder and the sliding sleeve; and / or the cylinder body of the crankshaft support cylinder has a plurality of oil storage holes passing through the inner and outer sides thereof.

[0011] In some embodiments, the circumferential limiting structure includes a limiting protrusion provided on one of the inner circumferential wall of the crankshaft support cylinder and the outer circumferential wall of the sliding sleeve and a limiting groove on the other; and / or, the axial limiting structure includes a limiting protrusion provided on the first end of the sliding sleeve and a limiting ring groove provided on the first end of the crankshaft support cylinder; and / or, the aperture of the oil storage hole is 1.0 mm to 3.0 mm.

[0012] In some embodiments, the second end of the crankshaft support cylinder has a cylinder seat thrust surface, and a plane rolling bearing is mounted on the crankshaft. A washer assembly is sandwiched between the plane rolling bearing and the cylinder seat thrust surface, and the washer assembly includes an upper washer and a lower washer, wherein the top surface of the upper washer contacts the plane rolling bearing, and the bottom surface of the lower washer contacts the cylinder seat thrust surface. When the washer assembly is subjected to axial force, one of the upper washer and the lower washer can be elastically deformed radially outward, and the other can be elastically deformed radially inward.

[0013] In some embodiments, the upper washer has a first tapered hole on a side facing the lower washer, and the lower washer has a first frustum on a side facing the upper washer, and the first frustum is matched and installed in the first tapered hole.

[0014] In some embodiments, the gasket component is made of a polymer material with plastic deformation.

[0015] In some embodiments, the substrate of the polymer material with plastic deformation is at least one of polytetrafluoroethylene PTFE, polyamide PA, polyimide PAI, polycarbonate PC, polyphenylene sulfide PPS, polyetheretherketone PEEK, ultra-high molecular weight polyethylene UHMWPE, polytetrafluoroethylene PTFE, fluoroplastic, and phenolic resin; and / or the Shore hardness of the polymer material with plastic deformation is 1 / 2 to 4 / 5 times that of the polymer material with anti-friction and wear-resistant properties.

[0016] The present invention also provides a piston compressor comprising the above-mentioned cylinder base assembly.

[0017] The present invention also provides a refrigerator comprising the above-mentioned piston compressor.

[0018] The cylinder seat assembly, piston compressor, and refrigerator provided by the present invention effectively reduce the friction power consumption between the crankshaft and the crankshaft support cylinder, that is, the cylinder seat, by arranging a sliding sleeve with lower hardness between the crankshaft with higher hardness and the crankshaft support cylinder, thereby reducing the operating power consumption of the compressor, and improving the performance and long-term operating reliability of the compressor to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of an exploded structure of a piston compressor according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the cylinder block;

[0021] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the sliding sleeve;

[0022] Figure 4 for Figure 1 Schematic diagram of the exploded structure of the middle gasket assembly;

[0023] Figure 5 This is a schematic diagram of the state in which the crankshaft tilts and causes eccentric wear at both ends of the crankshaft support cylinder in the prior art;

[0024] Figure 6 This is a schematic diagram of the internal structure of a cylinder base assembly using the technical solution of the present invention;

[0025] Figure 7 Schematic diagram of the adjustment state of the washer assembly after being subjected to force in an embodiment of the present invention;

[0026] Figure 8 This is a comparison chart of power consumption of compressors tested without and with the gasket assembly and sliding sleeve of the present invention;

[0027] Figure 9The figure is a comparison of the sound power levels of compressors tested without and with the gasket assembly and sliding sleeve of the present invention.

[0028] The reference numerals indicate:

[0029] 1. Cylinder block; 11. Crankshaft support cylinder; 2. Crankshaft; 3. Sliding sleeve; 31. Limiting protrusion; 32. Limiting groove; 33. Limiting convex ring; 34. Limiting ring groove; 35. Oil reservoir; 4. Plane rolling bearing; 5. Washer assembly; 51. Upper washer; 52. Lower washer; 100. Cylinder block assembly; 200. Crankshaft assembly; 220. Counterweight; 300. Piston assembly; 310. Connecting rod; 320. Piston; 330. Pin; 340, retaining spring pin; 400, valve assembly; 410, intake valve gasket; 420, intake valve plate; 430, valve plate; 440, exhaust valve plate; 450, limit plate; 460, gasket; 500, intake muffler; 600, cylinder head; 110, cylinder seat; 111, cylinder; 113, exhaust muffler chamber; 1211, lower end face of gasket; 1212, outer inclined surface of gasket; 1221, upper end face of gasket; 1222, inner inclined surface of gasket. DETAILED DESCRIPTION

[0030] As piston compressors gradually develop towards wide-band and high-efficiency, the operating frequency of the compressors is getting higher and higher, which will also cause the centrifugal force generated by the eccentric crankshaft connecting the piston and the connecting rod to become larger and larger. This centrifugal force will cause the crankshaft to tilt relative to the cylinder seat. Figure 5 As shown, this leads to eccentric wear of the upper and lower ends of the crankshaft and the cylinder seat crankshaft support cylinder, increased friction power consumption, and reduced performance of the compressor; in addition, the mechanical vibration noise of the pump body is relatively large. When the fitting clearance between the crankshaft and the crankshaft support cylinder gradually increases due to wear, the stability of the pump body parts during operation gradually decreases, and the operating noise of the compressor gradually increases.

[0031] In view of this, see Figures 1 to 9 As shown, a cylinder block assembly is provided, comprising a cylinder block 1 and a crankshaft 2. The cylinder block 1 has a crankshaft support cylinder 11, within which a sliding sleeve 3 is mounted. The crankshaft 2 is inserted into the sliding sleeve 3. The hardness of the sliding sleeve 3 is less than that of the crankshaft support cylinder 11, and the hardness of the sliding sleeve 3 is less than that of the crankshaft 2. Generally, the crankshaft 2 and the crankshaft support cylinder 11 are both made of relatively hard cast iron. In this technical solution, by disposing the relatively low-hardness sliding sleeve 3 between the relatively high-hardness crankshaft 2 and the crankshaft support cylinder 11, the frictional power consumption between the crankshaft 2 and the crankshaft support cylinder 11, i.e., the cylinder block 1, is effectively reduced, thereby reducing the operating power consumption of the compressor, thereby improving the performance and long-term reliability of the compressor.

[0032] In one specific embodiment, the sliding sleeve 3 can be made of an aluminum alloy, which has low manufacturing costs. In a preferred embodiment, the sliding sleeve 3 is made of a high polymer material with anti-friction and wear-resistant properties. Specifically, the base material of the high polymer material with anti-friction and wear-resistant properties is at least one of polytetrafluoroethylene (PTFE), polyamide (PA), polyimide (PAI), polycarbonate (PC), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), ultra-high molecular weight polyethylene (UHMWPE), polytetrafluoroethylene (PTFE), fluoroplastic, and phenolic resin. This ensures that the sliding sleeve 3 has high wear resistance and reduces frictional power consumption. To ensure high structural strength of the sliding sleeve 3, the Shore D hardness of the high polymer material with anti-friction and wear-resistant properties is above 60.

[0033] In some embodiments, the high polymer material with friction-reducing and wear-resistant properties contains 2.0% to 8.0% of a lubricant and 0.5% to 5.0% of wear-resistant particles. The lubricant is at least one of liquid crystal polymer (LCP), polyoxymethylene (POM), molybdenum disulfide (MoS2), tungsten disulfide (WS2), graphite, and graphene; and / or the wear-resistant particles are at least one of aluminum oxide (Al2O3), zirconium oxide (ZrO2), silicon carbide (SiC), titanium carbide (TiC), tungsten carbide (WC), and cast stone. This ensures that the sliding sleeve 3 has high wear resistance and lubrication properties.

[0034] The crankshaft support cylinder 11 and the sliding sleeve 3 are interference-fitted to achieve a reliable connection between the sliding sleeve 3 and the crankshaft support cylinder 11. In order to further improve the reliability of the connection and prevent rotation and axial movement, a circumferential limiting structure and / or an axial limiting structure are provided between the crankshaft support cylinder 11 and the sliding sleeve 3. Figure 2 and Figure 3 As shown, the circumferential limiting structure includes a limiting protrusion 31 provided on one of the inner circumferential wall of the crankshaft support cylinder 11 and the outer circumferential wall of the sliding sleeve 3, and a limiting groove 32 on the other. In a specific embodiment, the limiting groove 32 is provided on the inner circumferential wall of the crankshaft support cylinder 11, and the limiting protrusion 31 is provided on the outer circumferential wall of the sliding sleeve 3. The limiting grooves 32 and the limiting protrusions 31 correspond one to one, and the number can be reasonably selected according to needs; the axial limiting structure includes a limiting protrusion ring 33 provided on the first end of the sliding sleeve 3 and a limiting ring groove 34 provided on the first end of the crankshaft support cylinder 11.

[0035] like Figure 3As shown, the cylinder body of the crankshaft support cylinder 11 has a plurality of oil storage holes 35 that pass through the inside and outside thereof, which can store lubricating oil and keep the formed lubricating oil film from being easily destroyed even under the high-speed operation condition of the compressor, thereby ensuring that the friction power consumption between the crankshaft 2 and the crankshaft support cylinder 11 of the cylinder seat 1 is always in a low state. Preferably, the aperture of the oil storage hole 35 is 1.0mm~3.0mm.

[0036] See also Figure 1 、 Figure 6 and Figure 7 As shown, the second end of the crankshaft support cylinder 11 has a cylinder seat thrust surface (not marked in the figure), the crankshaft 2 is fitted with a flat rolling bearing 4, and a washer assembly 5 is sandwiched between the flat rolling bearing 4 and the cylinder seat thrust surface. Figure 4 As shown, the washer assembly 5 includes an upper washer 51 and a lower washer 52, wherein the top surface of the upper washer 51 contacts the plane rolling bearing 4, and the bottom surface of the lower washer 52 contacts the thrust surface of the cylinder seat. When the washer assembly 5 is subjected to axial force, one of the upper washer 51 and the lower washer 52 can be elastically deformed radially outward, and the other can be elastically deformed radially inward, so that the washer assembly 5 has a self-adjusting function. By utilizing the radial inward and outward elastic deformation of the upper washer 51 and the lower washer 52, not only can the matching position between the crankshaft 2 and the cylinder seat 1 be self-adjusted, but also the mechanical vibration noise of the pump body assembly can be reduced, thereby improving the user's listening experience. It should be noted that the gasket assembly 5 avoids the problem of eccentric wear between the crankshaft 2 and the cylinder block 1 to a certain extent. Specifically, under the action of centrifugal force, the crankshaft 2 tilts relative to the cylinder block 1, and this tilt generates a vertical downward force F' on the gasket assembly 5. Since the upper gasket 51 and the lower gasket 52 are matched with the inner and outer conical surfaces, the vertical component of the force F' will be offset by the reaction force generated by the conical surfaces. Only the separation in the horizontal direction will cause the upper gasket 51 to have a tendency to expand and contract outward. The force F' This will also cause the upper washer 51 to tend to move downward along the conical surface. In addition, the washer assembly 5 is made of a polymer material with a certain degree of elasticity and plasticity. At this time, the exposed conical edges of the upper washer 51 and the lower washer 52 will not only be squeezed by the thrust surface of the cylinder block 1 and the bottom surface of the plane ball bearing 4, but will also undergo plastic deformation. During the plastic deformation process, the remaining unoffset force of the remaining F' component in the vertical direction will also be partially or completely offset, so that the inclination of the crankshaft 2 relative to the cylinder block 1 is greatly reduced, thereby avoiding the occurrence of eccentric wear between the crankshaft 2 and the cylinder block 1 to a certain extent.

[0037] In some embodiments, the upper washer 51 has a first tapered hole on one side facing the lower washer 52, and the lower washer 52 has a first frustum on one side facing the upper washer 51. The first frustum is matched and installed in the first tapered hole. Figure 4As shown, the outer circle of the lower washer 52 is provided with a washer outer bevel 1212, the inner circle of the upper washer 51 is provided with a washer inner bevel 1222, and the washer lower end face 1211 of the lower washer 52 is in contact with the thrust surface of the cylinder seat 1, and the washer upper end face 1221 of the upper washer 51 is in contact with the plane rolling bearing 4. In this way, the upper washer 51 and the lower washer 52 can be elastically deformed inward and outward along their own radial direction when subjected to axial force, and can also self-regulate the unbalanced centrifugal force of the crankshaft during the operation of the compressor to a certain extent.

[0038] To ensure that the lower washer 52 and upper washer 51 possess a certain degree of plasticity and elasticity, both are made of a polymer material capable of plastic deformation, and the base material of the polymer material capable of plastic deformation is at least one of polytetrafluoroethylene (PTFE), polyamide (PA), polyimide (PAI), polycarbonate (PC), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), ultra-high molecular weight polyethylene (UHMWPE), polytetrafluoroethylene (PTFE), fluoroplastics, and phenolic resins. It should be noted that the aforementioned polymer material capable of plastic deformation and the polymer material with friction-reducing and wear-resistant properties are primarily of the same type, but the fillers added to each are different. Because the lower washer 52 and upper washer 51 of the washer assembly 5 are required to possess a certain degree of plastic deformation but not wear resistance, no additional fillers are required in the base materials of the lower washer 52 and upper washer 51. However, the sliding sleeve 3 is required to possess both friction-reducing and wear-resistant properties, and therefore a lubricant and wear-resistant particles are added to its base material. Furthermore, the Shore hardness of the polymer material with plastic deformation is 1 / 2 to 4 / 5 times that of the polymer material with anti-friction and wear-resistant properties.

[0039] like Figure 6 and Figure 7 As shown, the working principle of the washer assembly 5 and the sliding sleeve 3 in cooperation is:

[0040] When the crankshaft 2 is subjected to the unbalanced deflection centrifugal force, the upper washer 51 of the washer assembly 5 slides downward along the inclined sliding surface, and the upper end surface 1221 of the upper washer 51 is slightly plastically deformed by the action of the crankshaft 2 and the plane rolling bearing 4. However, the deformation of the upper washer 51 is not large, that is, it still maintains a good supporting effect on the plane rolling bearing 4 and the crankshaft 2. Under the dual action of sliding and micro-plastic deformation, it not only offsets part of the unbalanced deflection centrifugal force, but also absorbs part of the unevenness caused by the partial flatness. The vibration of the deflection centrifugal force is balanced; although sliding and slight plastic deformation can also cause the crankshaft 2 to tilt slightly relative to the crankshaft support cylinder 11 of the cylinder block 1, due to the interference fit between the crankshaft support cylinder 11 and the sliding sleeve 3, and the fact that the sliding sleeve 3 has a higher hardness than the upper washer 51 and lower washer 52 of the washer assembly 5, and the fact that the base material of the sliding sleeve 3 is always added with wear-resistant particles as a hard supporting phase, it can also provide a certain support for the tilted crankshaft 2, that is, the crankshaft 2 only tilts slightly. Even if the crankshaft 2 tilts slightly, the sliding sleeve 3 with the lubricating medium added not only has the material itself to reduce friction and lubricate, but the oil reservoir 35 can also store lubricating oil, thereby maintaining the formed lubricating oil film. These factors greatly reduce the friction power loss caused by the slight tilt. At the same time, the material of the sliding sleeve 3 with the wear-resistant particles added has excellent wear resistance, thus avoiding wear of the upper and lower ends of the crankshaft 2 and the crankshaft support cylinder 11 of the cylinder block 1 caused by the slight tilt. All of the above reduce the operating power consumption and vibration noise of the compressor.

[0041] The compressor using the above technical solution is a piston compressor. Comparative tests are conducted on piston compressors that are not assembled with and assembled with the gasket assembly 5 and the sliding sleeve 3. The specific operating power consumption of the compressor at different frequencies is as follows: Figure 8 As shown in FIG. 1 , it can be seen that the power consumption of the piston compressor equipped with the gasket assembly 5 and the sliding sleeve 3 at each operating frequency is lower than that of the piston compressor without the gasket assembly 5 and the sliding sleeve 3. The higher the operating frequency, the greater the reduction in power consumption. That is, the power consumption can be reduced by more than 10W at an operating frequency of 75Hz. The noise of the compressor at different operating frequencies is shown in FIG. Figure 9 As shown, the sound power level of the piston compressor equipped with the gasket assembly 5 and the sliding sleeve 3 at each operating frequency is lower than that of the piston compressor without the gasket assembly 5 and the sliding sleeve 3. The higher the operating frequency, the greater the reduction in the sound power level. That is, the sound power level can be reduced by about 10dB at an operating frequency of 100Hz.

[0042] The present invention also provides a piston compressor, comprising the above-mentioned cylinder base assembly. Figure 1As shown, the piston compressor includes a cylinder block assembly 100, a crankshaft assembly 200, a piston assembly 300, a valve assembly 400, an intake muffler 500, and a cylinder head 600. The cylinder block assembly 100 includes a cylinder block 1 and a planar rolling bearing 4. The planar rolling bearing 4 converts the friction between the crankshaft assembly 200 and the cylinder block 1 into rolling friction, thereby reducing the power consumption of the compressor caused by friction. Figure 2 As shown, the cylinder block 1 mainly includes a cylinder 111, a crankshaft support tube 11, and an exhaust muffler chamber 113. Two or more limiting grooves 32 are provided in the cylinder wall of the crankshaft support tube 11, and a limiting ring groove 34 is provided on the end surface of the lower end of the crankshaft support tube 11. The crankshaft assembly 200 includes a crankshaft 2 and a counterweight 220. Driven by a motor, the crankshaft assembly 200 drives the piston assembly 300 to perform reciprocating motion within the cylinder 111 of the cylinder block assembly 100, sucking in and compressing and discharging gas or refrigerant. The piston assembly 300 is composed of a connecting rod 310, a piston 320, a pin 330, and a retaining spring pin 340. The suction and compression and discharge of gas or refrigerant are controlled by the valve assembly 400, and the valve assembly 400 mainly includes an intake valve gasket 410, an intake valve plate 420, a valve plate 430, an exhaust valve plate 440, a limit plate 450, and a gasket 460. The valve assembly 400 is pressed and fixed on the cylinder base 1 by the cylinder head 600 to ensure the overall airtightness of the compression chamber in the cylinder base 1.

[0043] After the suction muffler 500 is installed in the front section of the inhaled gas or refrigerant, the noise generated by the pulsation of the inhaled gas can be effectively reduced, thereby achieving the purpose of reducing the overall noise of the compressor.

[0044] The present invention also provides a refrigerator comprising the above-mentioned piston compressor.

[0045] It is easy for those skilled in the art to understand that, under the premise of no conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A cylinder block assembly, comprising a cylinder block (1) and a crankshaft (2), wherein the cylinder block (1) has a crankshaft support cylinder (11), characterized in that: The crankshaft support cylinder (11) is provided with a sliding sleeve (3), the crankshaft (2) is inserted into the sliding sleeve (3), the hardness of the sliding sleeve (3) is less than the hardness of the crankshaft support cylinder (11), and the hardness of the sliding sleeve (3) is less than the hardness of the crankshaft (2); the second end of the crankshaft support cylinder (11) has a cylinder seat thrust surface, the crankshaft (2) is provided with a plane rolling bearing (4), a washer assembly (5) is sandwiched between the plane rolling bearing (4) and the cylinder seat thrust surface, and the washer assembly (5) includes an upper washer (51), a lower washer (52), wherein the top surface of the upper washer (51) contacts the plane rolling bearing (4), and the bottom surface of the lower washer (52) contacts the thrust surface of the cylinder seat, and when the washer assembly (5) is subjected to axial force, one of the upper washer (51) and the lower washer (52) can elastically deform radially outward, and the other can elastically deform radially inward; the sliding sleeve (3) is made of a polymer material with anti-friction and wear-resistant properties, and the crankshaft support cylinder (11) and the sliding sleeve (3) are interference fit.

2. The cylinder block assembly according to claim 1, wherein: The base material of the polymer material with anti-friction and wear-resistant properties is at least one of polytetrafluoroethylene PTFE, polyamide PA, polyimide PAI, polycarbonate PC, polyphenylene sulfide PPS, polyetheretherketone PEEK, ultra-high molecular weight polyethylene UHMWPE, polytetrafluoroethylene PTFE, fluoroplastic, and phenolic resin; and / or the Shore hardness of the polymer material with anti-friction and wear-resistant properties is above 60.

3. The cylinder block assembly according to claim 2, wherein: The high polymer material with anti-friction and wear-resistant properties contains 2.0% to 8.0% of lubricating medium and 0.5% to 5.0% of wear-resistant particles.

4. The cylinder block assembly according to claim 3, wherein: The lubricating medium is at least one of liquid crystal polymer LCP, polyoxymethylene POM, molybdenum disulfide MoS2, tungsten disulfide WS2, graphite, and graphene; and / or the wear-resistant particles are at least one of aluminum oxide Al2O3, zirconium oxide ZrO2, silicon carbide SiC, titanium carbide TiC, tungsten carbide WC, and cast stone.

5. The cylinder block assembly according to claim 1, wherein: A circumferential limiting structure and / or an axial limiting structure is provided between the crankshaft support cylinder (11) and the sliding sleeve (3); and / or the cylinder body of the crankshaft support cylinder (11) has a plurality of oil storage holes (35) that pass through the inside and outside thereof.

6. The cylinder block assembly according to claim 5, characterized in that The circumferential limiting structure comprises a limiting protrusion (31) provided on one of the inner circumferential wall of the crankshaft support cylinder (11) and the outer circumferential wall of the sliding sleeve (3) and a limiting groove (32) provided on the other; and / or, the axial limiting structure comprises a limiting protrusion (33) provided on the first end of the sliding sleeve (3) and a limiting ring groove (34) provided on the first end of the crankshaft support cylinder (11); and / or, the aperture of the oil storage hole (35) is 1.0 mm to 3.0 mm.

7. The cylinder block assembly according to claim 1, wherein: The upper washer (51) has a first tapered hole on one side facing the lower washer (52), and the lower washer (52) has a first frustum on one side facing the upper washer (51), and the first frustum is matched and installed in the first tapered hole.

8. The cylinder block assembly according to claim 1, wherein: The material of the gasket assembly (5) is a polymer material with plastic deformation.

9. The cylinder block assembly according to claim 8, wherein: The base material of the polymer material with plastic deformation is at least one of polytetrafluoroethylene PTFE, polyamide PA, polyimide PAI, polycarbonate PC, polyphenylene sulfide PPS, polyetheretherketone PEEK, ultra-high molecular weight polyethylene UHMWPE, polytetrafluoroethylene PTFE, fluoroplastic, and phenolic resin; and / or the Shore hardness of the polymer material with plastic deformation is 1 / 2 to 4 / 5 times that of the polymer material with anti-friction and wear-resistant properties.

10. A piston compressor, characterized in that: A cylinder block assembly comprising the cylinder block assembly according to any one of claims 1 to 9.

11. A refrigerator, characterized in that: The invention comprises the piston compressor as claimed in claim 10.

Images