Crankshaft, compressor and refrigeration equipment

Abstract

The invention provides a crankshaft, a compressor and refrigeration equipment, the crankshaft is used for the compressor, and the crankshaft comprises a shaft body, a white bright layer and an oxide layer. The white bright layer is at least arranged in the surface of the shaft body for mounting a piston or a bearing of the compressor; the oxide layer is arranged on one side of the white bright layer away from the shaft body. According to the crankshaft design provided by the invention, the compound layer, namely the white bright layer, is introduced, and the white bright layer and the oxide layer are combined into the wear-resistant layer, so that the wear resistance and the corrosion resistance of the crankshaft are remarkably improved, the self-lubricating effect is achieved under the working condition of oil lubrication, and the friction loss is effectively reduced. The problem of local abrasion caused by the eccentric part of the crankshaft in the related technology is solved, and a powerful guarantee is provided for long-term stable operation of key equipment such as a compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a crankshaft, a compressor and a refrigeration equipment. Background Art

[0002] At present, in the related technology, the compressor includes a crankshaft, a piston and a cylinder. The crankshaft is provided with an eccentric part, and the piston is sleeved in the eccentric part. The crankshaft can drive the piston to move in the cylinder, thereby realizing the compression of the refrigerant. However, since the eccentric part exists in the process of the crankshaft rotating, the eccentric part causes the crankshaft to have an eccentric centrifugal force when rotating, which will cause the local wear of the crankshaft to be larger, thereby reducing the service life of the crankshaft. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present invention provides a crankshaft.

[0005] A second aspect of the present invention provides a compressor.

[0006] A third aspect of the present invention provides a refrigeration device.

[0007] In view of this, a first aspect of the present invention provides a crankshaft, which is used for a compressor, and comprises a shaft body, a white bright layer and an oxide layer. The white bright layer is arranged at least in a region on the surface of the shaft body for mounting a piston or a bearing of the compressor; and the oxide layer is arranged on a side of the white bright layer away from the shaft body.

[0008] The crankshaft proposed in the present invention is used for a compressor, and the crankshaft includes a shaft body. The white bright layer is arranged at least in the area on the surface of the shaft body for installing the piston or bearing of the compressor, so as to provide a high-hardness, high-wear-resistant protective layer on the surface of the shaft body, which effectively resists the friction and wear caused by the rotation of the crankshaft.

[0009] Specifically, the white bright layer refers to a compound layer composed of one or two phases on the surface of the nitrided workpiece, also known as a compound layer or a combined layer.

[0010] Specifically, the white bright layer is usually composed of high-hardness metal compounds or alloys. These materials are subjected to heat treatment, carburizing or nitriding, etc. to form a dense and hard protective layer, which can significantly improve the wear resistance and fatigue resistance of the surface of the shaft.

[0011] The oxide layer exhibits good self-lubricating ability under oil lubrication conditions. Its microstructure helps to form a stable lubrication interface in the oil film, reducing direct contact between metals, thereby reducing the friction coefficient and wear rate. In addition, the presence of the oxide layer can effectively prevent corrosion and protect the white layer from environmental factors.

[0012] Compared with the traditional combination of phosphating layer and solid lubricating coating, the structure of white bright layer and oxide layer in the present application has significant advantages in wear resistance. In the related art, although the phosphating layer can provide certain anti-corrosion and lubrication effects, its wear resistance and durability are often insufficient in high-load and high-speed compressor applications. The combined wear-resistant layer of the present application can maintain long-term stability and reliability under more severe working conditions.

[0013] The present invention can improve the wear resistance of the crankshaft surface and reduce the friction force on the crankshaft during rotation by combining the whitening layer with the oxide layer, thereby effectively reducing the wear on the crankshaft during the operation of the compressor, solving the problem of large local wear of the crankshaft, extending the service life of the crankshaft, and improving the stability of the compressor. In addition, since the wear of the crankshaft is reduced by combining the whitening layer with the oxide layer, the matching accuracy of the crankshaft with bearings, pistons and other components can be improved, thereby avoiding the influence of the compressor efficiency on the compressor due to the reduction of the matching accuracy of the crankshaft with bearings, pistons and other components, so that the energy efficiency of the compressor can be maintained in a better range after a period of use, thereby improving the quality of the compressor.

[0014] Since the whitening layer and the oxide layer cooperate to reduce the wear of the crankshaft and improve the matching accuracy between the crankshaft and bearings, pistons and other components, it can also reduce the vibration and noise generated by the compressor during operation, thereby reducing the noise pollution of the compressor to the surrounding environment and further improving the quality of the compressor.

[0015] In summary, the crankshaft proposed by the present invention not only significantly improves the wear resistance and corrosion resistance of the crankshaft by introducing a compound layer, i.e., a white bright layer, so that the white bright layer and the oxide layer form a wear-resistant layer, but also realizes a self-lubricating effect under oil lubrication conditions, effectively reducing friction loss. It solves the problem of local wear of the crankshaft caused by the eccentric part in the related art, and also provides a strong guarantee for the long-term stable operation of key equipment such as compressors.

[0016] In addition, the crankshaft in the above technical solution provided by the present invention may also have the following additional technical features:

[0017] In some technical solutions of the present invention, optionally, the thickness of the oxide layer is greater than or equal to 0.1 micrometer and less than or equal to 1 micrometer.

[0018] In this technical solution, the oxide layer of the crankshaft is covered on the white bright layer, wherein the thickness of the oxide layer is controlled between 0.1 microns and 1 micron. By setting the above-mentioned range of oxide layer thickness, it is possible to provide additional lubrication effect while further enhancing wear resistance.

[0019] In some technical solutions of the present invention, optionally, the thickness of the white bright layer is greater than or equal to 3 microns.

[0020] In this technical solution, the thickness of the white bright layer is set to be greater than or equal to 3 microns. When the thickness reaches or exceeds 3 microns, the white bright layer can better withstand the pressure and friction from the piston or bearing, reduce surface wear caused by long-term operation, and can work for a longer time.

[0021] The thicker white layer also provides better fatigue resistance. As the crankshaft rotates continuously, the surface is subjected to periodic stress and strain. The thicker protective layer can better absorb and disperse these stresses, reduce the risk of cracks and fractures caused by fatigue, and extend the overall service life of the crankshaft.

[0022] In some technical solutions of the present invention, optionally, the surface roughness of the white bright layer is greater than or equal to Rz1.2 and less than or equal to Rz3.5.

[0023] In this technical solution, the present application sets the surface roughness of the white bright layer to be greater than or equal to Rz1.2 and less than or equal to Rz3.5. The setting value in this range can ensure the adhesion of the oxide layer while making the surface of the white bright layer smoother, thereby reducing wear and extending its life.

[0024] In some technical solutions of the present invention, optionally, the shaft body is a shaft body made of medium carbon steel or a shaft body made of cast iron.

[0025] In this technical solution, on the one hand, the shaft body is made of medium carbon steel. Medium carbon steel has high strength and good plasticity and toughness. Under the premise of maintaining the rigidity of the crankshaft, the use of medium carbon steel material can allow a smaller crankshaft outer diameter design. The smaller crankshaft outer diameter and lighter weight help reduce friction loss and energy consumption. The high strength and wear resistance of medium carbon steel also help to extend the service life of the crankshaft and reduce downtime and maintenance costs.

[0026] On the other hand, the shaft body is made of cast iron. Cast iron has excellent wear resistance, corrosion resistance and shock absorption performance, and the shaft body made of cast iron has a long service life.

[0027] In some technical solutions of the present invention, optionally, the shaft body is a steel shaft body formed by high-temperature hot forging.

[0028] In this technical solution, the steel shaft is formed by high-temperature hot forging, which improves the density of the steel crankshaft and the grain size, so that the fiber streamlines inside the shaft are basically consistent with the outer shape, without distortion, interruption, or eddy current, thereby improving the rigidity of the shaft and reducing the risk of shaft deformation.

[0029] In some technical solutions of the present invention, optionally, the shaft body includes an eccentric part, a main shaft and a secondary shaft, the main shaft is connected to the eccentric part and is located on one side of the eccentric part in the axial direction; the secondary shaft is connected to the eccentric part and is located on the other side of the eccentric part in the axial direction.

[0030] In this technical solution, the shaft body of the present invention includes an eccentric part, a main shaft and a secondary shaft. The main shaft and the secondary shaft are respectively connected to the eccentric part in the axial direction and are located on both sides thereof. The existence of the eccentric part enables the shaft body to generate different centrifugal forces when rotating to adapt to a variety of equipment. The eccentric design may also be used to adjust the center of gravity position of the shaft body to optimize the operating performance of the equipment.

[0031] The main shaft and the secondary shaft are connected to the two sides of the eccentric part respectively. This design helps to disperse the load on the shaft and improve the strength and stability of the overall structure.

[0032] In some technical solutions of the present invention, optionally, the outer diameter of the shaft body is a first diameter D1; the minimum thickness of the oxide layer is a first thickness H; the first thickness and the first diameter satisfy the following relationship: 0.00007D1≤H≤0.0004D1.

[0033] In this technical solution, the outer diameter of the shaft body is the first diameter, and the minimum thickness H of the oxide layer is greater than or equal to 0.00007 times the first diameter D1, so that the solid lubricant can provide lubrication effect for the shaft body more permanently.

[0034] The minimum thickness of the oxide layer is less than or equal to 0.0004 times the first diameter, so that the oxide layer will not occupy too much space between the shaft and the bearing, and between the shaft and the piston, thereby avoiding excessive gaps between the shaft and the bearing, and between the shaft and the piston due to wear of the solid lubricant, and improving the matching accuracy between the shaft and the bearing, and between the shaft and the piston; and the minimum thickness of the oxide layer is less than or equal to 0.0004 times the first diameter D1, which can also avoid excessive adhesion of the oxide layer due to excessive thickness of the oxide layer, reduce the probability of the oxide layer falling off, improve the stability of the oxide layer adhering to the shaft, and thereby improve the lubrication effect of the oxide layer on the crankshaft.

[0035] In some technical solutions of the present invention, optionally, the white bright layer is arranged on at least part of the surface of the eccentric portion, at least part of the surface of the secondary shaft, and at least part of the surface of the primary shaft.

[0036] In this technical solution, the white bright layer is arranged on at least part of the surface of the eccentric part, at least part of the surface of the secondary shaft and at least part of the surface of the main shaft, which can enhance the wear resistance, corrosion resistance and overall performance of these components.

[0037] Specifically, the eccentric part is a key part of the shaft body that generates centrifugal force and affects the performance of the equipment. Arranging a white bright layer on at least part of the surface of the eccentric part can enhance its wear resistance and corrosion resistance, and also help maintain the stability of its shape and size.

[0038] The secondary shaft is usually connected to the eccentric part and bears a certain load and friction. Arranging the white bright layer on at least part of the surface of the secondary shaft can improve its wear resistance and load-bearing capacity, thereby extending the service life of the secondary shaft.

[0039] The spindle is the main load-bearing component in the shaft body, and its performance directly affects the overall operation effect of the equipment. Arranging a white bright layer on at least part of the surface of the spindle can significantly improve its wear resistance and fatigue resistance, ensuring the stability and reliability of the spindle during long-term operation.

[0040] A second aspect of the present invention provides a compressor, comprising a crankshaft as in any of the above technical solutions, so that the compressor has all the beneficial effects of the crankshaft as in any of the above technical solutions.

[0041] The third aspect of the present invention provides a refrigeration device, including a crankshaft as in any of the above technical solutions, or a compressor as in any of the above technical solutions, so that the refrigeration device has all the beneficial effects of the crankshaft as in any of the above technical solutions or the compressor as in any of the above technical solutions.

[0042] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0044] Figure 1 is a schematic structural diagram of a crankshaft according to an embodiment of the present invention;

[0045] Figure 2 A schematic diagram of a partial structure of a crankshaft according to an embodiment of the present invention;

[0046] Figure 3 is a schematic structural diagram of a piston according to an embodiment of the present invention;

[0047] Figure 4 is a schematic structural diagram of a main bearing according to an embodiment of the present invention;

[0048] Figure 5 Schematic diagram of the structure of a secondary bearing according to an embodiment of the present invention.

[0049] in, Figures 1 to 5The corresponding relationship between the reference numerals and the component names is as follows:

[0050] 100 shaft body, 110 assembly surface, 112 first surface, 114 third surface, 116 fifth surface, 120 eccentric part, 130 main shaft, 140 secondary shaft, 200 white bright layer, 300 oxide layer, 400 piston, 410 second surface, 500 bearing, 510 main bearing, 512 fourth surface, 520 secondary bearing, 522 sixth surface. DETAILED DESCRIPTION

[0051] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0052] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0053] Refer to the following Figures 1 to 5 A crankshaft, a compressor and a refrigeration device according to some embodiments of the present invention are described.

[0054] like Figure 1 As shown, in one embodiment of the present invention, a crankshaft is provided, the crankshaft is used for a compressor, and the crankshaft comprises a shaft body 100, a white bright layer 200, and an oxide layer 300. The white bright layer 200 is arranged at least in the area of ​​the surface of the shaft body 100 for mounting a piston 400 or a bearing 500 of the compressor; the oxide layer 300 is arranged on the side of the white bright layer 200 away from the shaft body 100.

[0055] In this embodiment, the crankshaft proposed by the present invention is used for a compressor, and the crankshaft includes a shaft body 100, and the white bright layer 200 is arranged at least in the area on the surface of the shaft body 100 for installing the piston 400 or the bearing 500 of the compressor, so as to provide a high-hardness, high-wear-resistant protective layer on the surface of the shaft body 100, which effectively resists the friction and wear caused by the rotation of the crankshaft.

[0056] Specifically, the white bright layer 200 refers to a compound layer composed of one or two phases on the surface of the nitrided workpiece, also known as a compound layer or a combined layer.

[0057] Specifically, the white bright layer 200 is usually composed of a high-hardness metal compound or alloy. These materials are subjected to heat treatment, carburizing or nitriding, etc. to form a dense and hard protective layer, which can significantly improve the wear resistance and fatigue resistance of the surface of the shaft body 100.

[0058] The oxide layer 300 of the crankshaft covers the white bright layer 200 and is away from the core part of the shaft body 100. The thickness of the oxide layer 300 is controlled between 0.1 microns and 1 micron, thereby providing additional lubrication effect while further enhancing wear resistance.

[0059] The oxide layer 300 exhibits good self-lubricating ability under oil lubrication conditions. Its microstructure helps to form a stable lubrication interface in the oil film, reducing direct contact between metals, thereby reducing the friction coefficient and wear rate. In addition, the presence of the oxide layer 300 can also effectively prevent corrosion and protect the white bright layer 200 from environmental factors.

[0060] Compared with the traditional combination of phosphating layer and solid lubricating coating, the white bright layer 200 and oxide layer 300 structure of the present application has significant advantages in wear resistance. In the related art, although the phosphating layer can provide certain anti-corrosion and lubrication effects, its wear resistance and durability are often insufficient in high-load and high-speed compressor applications. The combined wear-resistant layer of the present application can maintain long-term stability and reliability under more severe working conditions.

[0061] The present invention can improve the wear resistance of the crankshaft surface and reduce the friction force on the crankshaft during rotation by cooperating the whitening layer with the oxide layer 300, thereby effectively reducing the wear on the crankshaft during the operation of the compressor, solving the problem of large local wear of the crankshaft, extending the service life of the crankshaft, and improving the stability of the compressor. In addition, since the wear of the crankshaft is reduced by cooperating the whitening layer with the oxide layer 300, the matching accuracy of the crankshaft with the bearing 500, the piston 400 and other components can be improved, thereby avoiding the influence of the compressor efficiency on the compressor due to the reduction of the matching accuracy of the crankshaft with the bearing 500, the piston 400 and other components, so that the energy efficiency of the compressor can be maintained in a better range after a period of use, thereby improving the quality of the compressor.

[0062] Since the whitening layer cooperates with the oxide layer 300 to reduce the wear of the crankshaft and improve the matching accuracy between the crankshaft and components such as the bearing 500 and the piston 400, it can also reduce the vibration and noise generated by the compressor during operation, thereby reducing the noise pollution of the compressor to the surrounding environment and further improving the quality of the compressor.

[0063] In summary, the crankshaft proposed by the present invention not only significantly improves the wear resistance and corrosion resistance of the crankshaft by introducing a compound layer, namely, the white bright layer 200, so that the white bright layer 200 and the oxide layer 300 form a wear-resistant layer, but also realizes a self-lubricating effect under oil lubrication conditions, effectively reducing friction loss. It solves the problem of local wear of the crankshaft caused by the eccentric part 120 in the related art, and also provides a strong guarantee for the long-term stable operation of key equipment such as compressors.

[0064] Specifically, compared with the crankshaft in the related art, the present invention can increase the rigidity of the compressor by 25% under the same shaft diameter, while reducing the noise by 3dBA-4dBA. The shaft diameter can be reduced under the same rigidity to increase the energy efficiency by 2%; under the same substrate material, the coating life of the present invention can be increased by 2.0 times.

[0065] Specifically, the present invention first generates a white bright layer 200, also called a "compound layer", on the surface of the crankshaft through QPQ (Quench-Polish-Quench, salt bath composite treatment technology) treatment, and then generates an oxide layer 300 on the basis of the white bright layer 200.

[0066] Specifically, QPQ treatment technology is a composite treatment technology that combines salt bath nitrocarburizing and salt bath oxidation-polishing-secondary salt bath oxidation. This treatment technology can significantly improve the hardness, wear resistance and corrosion resistance of the metal surface, thereby extending the service life of the workpiece and ensuring its performance.

[0067] In the QPQ treatment process, nitrogen, carbon and other elements are first infiltrated into the workpiece surface through salt bath nitrocarburizing. These elements combine with the iron atoms on the workpiece surface to form a compound layer, namely the white bright layer 200. After the white bright layer 200 is formed, the crankshaft will be placed in an oxidizing salt bath for heat preservation. In this process, an oxidation reaction will occur on the workpiece surface, forming a dense oxide layer 300.

[0068] By forming a white layer 200 and an oxide layer 300, the QPQ treatment technology can significantly improve the hardness, wear resistance and corrosion resistance of the workpiece surface. Due to the improvement of surface properties, the service life of the workpiece will also be correspondingly extended. The entire QPQ treatment process is pollution-free and meets environmental protection requirements.

[0069] Specifically, the outer surface of the crankshaft, that is, the area on the surface of the shaft body 100 where the piston 400 or the bearing 500 of the compressor is mounted, is entirely a wear-resistant layer composed of a white bright layer 200 and an oxide layer 300 generated after QPQ treatment.

[0070] Specifically, the main component of the oxide layer 300 is Fe 3 O 4 (ferroferric oxide).

[0071] Specifically, the white bright layer 200 is mainly composed of Fe 3 (NC), that is, a compound containing iron, carbon, and nitrogen.

[0072] like Figure 1 As shown, in some embodiments of the present invention, optionally, the thickness of the oxide layer 300 is greater than or equal to 0.1 micrometer and less than or equal to 1 micrometer.

[0073] In this embodiment, the oxide layer 300 of the crankshaft is covered on the white bright layer 200, wherein the thickness of the oxide layer 300 is controlled between 0.1 microns and 1 micron. By setting the thickness range of the oxide layer 300 as above, it is achieved to provide additional lubrication effect while further enhancing the wear resistance.

[0074] Specifically, the thickness of the oxide layer 300 is greater than or equal to 0.1 micrometer and less than or equal to 1 micrometer. Exemplarily, the thickness of the oxide layer 300 may be 0.1 micrometer, 0.2 micrometer, 0.3 micrometer, 0.4 micrometer, 0.5 micrometer, 0.6 micrometer, 0.7 micrometer, 0.8 micrometer, 0.9 micrometer or 1 micrometer.

[0075] like Figure 2 As shown, in some embodiments of the present invention, optionally, the thickness of the white bright layer 200 is greater than or equal to 3 microns.

[0076] In this embodiment, the thickness t of the white bright layer 200 is set to be greater than or equal to 3 microns. When the thickness t reaches or exceeds 3 microns, the white bright layer 200 can better withstand the pressure and friction from the piston 400 or the bearing 500, reduce surface wear caused by long-term operation, and can work for a longer time.

[0077] The thicker white bright layer 200 can also provide better fatigue resistance. During the continuous rotation of the crankshaft, the surface will be subjected to periodic stress and strain. The thicker protective layer can better absorb and disperse these stresses, reduce the risk of cracks and fractures caused by fatigue, and extend the overall service life of the crankshaft.

[0078] For example, the thickness of the white bright layer 200 may be 3 micrometers, 4 micrometers, 5 micrometers, 6 micrometers, 7 micrometers, 8 micrometers, 9 micrometers, or 10 micrometers.

[0079] like Figure 2 As shown, in some embodiments of the present invention, optionally, the surface roughness of the white bright layer 200 is greater than or equal to Rz1.2 and less than or equal to Rz3.5.

[0080] In this embodiment, the present invention sets the surface roughness of the white bright layer 200 to be greater than or equal to Rz1.2 and less than or equal to Rz3.5. This setting value range can ensure the adhesion of the oxide layer 300 while making the surface of the white bright layer 200 smoother, thereby reducing wear and extending its life.

[0081] Specifically, surface roughness is one of the key factors affecting the wear resistance of materials. When the surface roughness of the white bright layer 200 is too large, the effective contact area between the mating surfaces will be reduced, resulting in increased pressure and friction resistance, thereby accelerating wear. On the contrary, when the surface roughness is moderate, the friction resistance can be reduced and the wear rate can be reduced.

[0082] The oxide layer 300 needs to be firmly attached to the surface of the white bright layer 200 to ensure its long-term stability and protective effect. The selection of the range of Rz1.2 to Rz3.5 in the present invention not only takes into account the smoothness requirements of the white bright layer 200, but also takes into account the bonding strength requirements between the oxide layer 300 and the compressor crankshaft, providing a strong guarantee for the long-term stable operation of key components.

[0083] Specifically, RZ represents the ten-point height of microscopic roughness.

[0084] Exemplarily, the surface roughness of the white bright layer 200 may be Rz1.2, Rz1.3, Rz1.4, Rz1.5, Rz1.6, Rz1.7, Rz1.8, Rz1.9, Rz2.0, Rz2.1, Rz2.2, Rz2.3, Rz2.4, Rz2.5, Rz2.6, Rz2.7, Rz2.8, Rz2.9, Rz3.0, Rz3.1, Rz3.2, Rz3.3, Rz3.4 or Rz3.5.

[0085] In some embodiments of the present invention, optionally, the shaft body 100 is a shaft body made of medium carbon steel or a shaft body made of cast iron.

[0086] In this embodiment, on the one hand, the shaft body 100 is made of medium carbon steel. Medium carbon steel has high strength and good plasticity and toughness. Under the premise of maintaining the rigidity of the crankshaft, the use of medium carbon steel material can allow a smaller crankshaft outer diameter design. The smaller crankshaft outer diameter and lighter weight help reduce friction loss and energy consumption. The high strength and wear resistance of medium carbon steel also help to extend the service life of the crankshaft and reduce downtime and maintenance costs.

[0087] Specifically, the shaft body 100 is made of medium carbon steel such as (45#, 40Cr, 20Cr).

[0088] Specifically, the carbon (C) content of the shaft body 100 is between 0.25% and 0.60%, and it also contains trace metal elements such as manganese (Mn), silicon (Si), phosphorus (P), sulfur (S), chromium (Cr), nickel (Ni), molybdenum (Mo), vanadium (V), and copper (Cu).

[0089] On the other hand, the shaft body 100 is made of cast iron, which has excellent wear resistance, corrosion resistance and shock absorption performance, and has a long service life.

[0090] In some embodiments of the present invention, optionally, the shaft body 100 is a steel shaft body formed by high temperature hot forging.

[0091] In this embodiment, the steel shaft body is formed by high-temperature hot forging, which improves the density of the steel crankshaft and the grain size, so that the fiber streamlines inside the shaft body 100 are basically consistent with the outer shape without distortion, interruption, and eddy current, thereby improving the rigidity of the shaft body 100 and reducing the risk of deformation of the shaft body 100.

[0092] The present invention adopts a high-temperature hot forging method to improve the density of the steel shaft, improve the grain size, and ensure the fiber streamline.

[0093] Specifically, the fiber streamlines inside the shaft body 100 are substantially consistent with the outer shape and are free of distortion, interruption and eddy current.

[0094] like Figure 1 As shown, in some embodiments of the present invention, optionally, the shaft body 100 includes an eccentric portion 120, a main shaft 130 and a secondary shaft 140, the main shaft 130 is connected to the eccentric portion 120, and is located on one side of the eccentric portion 120 in the axial direction; the secondary shaft 140 is connected to the eccentric portion 120, and is located on the other side of the eccentric portion 120 in the axial direction.

[0095] In this embodiment, the shaft body 100 of the present invention includes an eccentric portion 120, a main shaft 130 and a secondary shaft 140. The main shaft 130 and the secondary shaft 140 are respectively connected to the eccentric portion 120 in the axial direction (such as Figure 1 The eccentric portion 120 is connected in the direction indicated by the arrow A in the middle and is located on both sides thereof. The existence of the eccentric portion 120 enables the shaft body 100 to generate different centrifugal forces when rotating so as to adapt to a variety of equipment. The eccentric design may also be used to adjust the center of gravity position of the shaft body 100 to optimize the operating performance of the equipment.

[0096] The main shaft 130 and the secondary shaft 140 are respectively connected to the two sides of the eccentric portion 120. This design helps to disperse the load on the shaft body 100 and improve the strength and stability of the overall structure.

[0097] Specifically, the shaft body 100 is a rotatable shaft including a main shaft 130 , a secondary shaft 140 and an eccentric portion 120 .

[0098] Specifically, the outer surface of the main shaft 130 contacts the main bearing 510 , the outer surface of the auxiliary shaft 140 contacts the auxiliary bearing 520 , and the outer surface of the eccentric portion 120 contacts the roller.

[0099] Specifically, the outer surface of the shaft body 100 includes at least one assembly surface 110 , and the piston 400 or the bearing 500 of the compressor can be mounted on the at least one assembly surface 110 .

[0100] Specifically, Figure 1 and Figure 3As shown, the assembly surface 110 includes a first surface 112 , which is a circumferential surface of the eccentric portion 120 , and the inner hole of the piston 400 has a second surface 410 , and the first surface 112 matches the second surface 410 .

[0101] like Figure 1 and Figure 4 As shown, the assembly surface 110 includes a third surface 114 , which is a circumferential surface of the main shaft 130 , and the inner hole of the main bearing 510 has a fourth surface 512 , and the third surface 114 matches the fourth surface 512 .

[0102] like Figure 1 and Figure 5 As shown, the assembly surface 110 includes a fifth surface 116 , which is a circumferential surface of the secondary shaft 140 . The inner hole of the secondary bearing 520 has a sixth surface 522 , and the fifth surface 116 matches the sixth surface 522 .

[0103] Specifically, Figure 1 As shown, the ratio of the outer diameter D2 of the main shaft 130 to the outer diameter D3 of the secondary shaft 140 is greater than or equal to 1.1 and less than or equal to 1.5.

[0104] The ratio of the outer diameter D2 of the main shaft 130 to the outer diameter D3 of the secondary shaft 140 is between 1.1 and 1.5, so that the outer diameter D2 of the main shaft 130 is larger than the outer diameter D3 of the secondary shaft 140, thereby improving the strength, reducing the probability of bending of the main shaft 130 during the operation of the compressor, further reducing the eccentric wear of the main shaft 130, and improving the stability of the crankshaft during the operation of the compressor.

[0105] For example, the ratio of the outer diameter D2 of the main shaft 130 to the outer diameter D3 of the secondary shaft 140 may be 1.1, 1.2, 1.3, 1.4 or 1.5.

[0106] like Figure 2 As shown, in some embodiments of the present invention, optionally, the outer diameter of the shaft body 100 is a first diameter D1; the minimum thickness of the oxide layer 300 is a first thickness H; the first thickness and the first diameter satisfy the following relationship: 0.00007D1≤H≤0.0004D1.

[0107] In this embodiment, the outer diameter of the shaft body 100 is the first diameter D1 , and the minimum thickness of the oxide layer 300 is greater than or equal to 0.00007 times the first diameter D1 , so that the solid lubricant can provide lubrication effect for the shaft body 100 more permanently.

[0108] The minimum thickness of the oxide layer 300 is less than or equal to 0.0004 times the first diameter, so that the oxide layer 300 does not occupy too much space between the shaft body 100 and the bearing 500, and the shaft body 100 and the piston 400, thereby avoiding excessive clearance between the shaft body 100 and the bearing 500, and the shaft body 100 and the piston 400 due to wear of the solid lubricant, and improving the matching accuracy between the shaft body 100 and the bearing 500, and the shaft body 100 and the piston 400. The minimum thickness of the oxide layer 300 is less than or equal to 0.0004 times the first diameter, and it can also avoid the oxide layer 300 being too thick and causing the oxide layer 300 to have too much adhesion, reduce the probability of the oxide layer 300 falling off, and improve the stability of the oxide layer 300 adhering to the shaft body 100, thereby improving the lubrication effect of the oxide layer 300 on the crankshaft.

[0109] Illustratively, the first thickness H may be 0.00007D1, 0.00008D1, 0.00009D1, 0.0001D1, 0.0002D1, 0.0003D1, or 0.0004D1.

[0110] Specifically, the outer diameter of the shaft body 100 refers to the outer diameter of the shaft body 100, which is the longest distance from the outer edge of the shaft body 100 through its center point to the edge of the opposite surface. There is an oil hole on the shaft body 100 for providing lubricating oil, and the outer diameter refers to the size of the outer circumference of the shaft body 100, not the diameter of the oil hole.

[0111] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, optionally, the white bright layer 200 is arranged on at least a portion of the surface of the eccentric portion 120 , at least a portion of the surface of the secondary shaft 140 , and at least a portion of the surface of the primary shaft 130 .

[0112] In this embodiment, the white bright layer 200 is arranged on at least part of the surface of the eccentric portion 120 , at least part of the surface of the secondary shaft 140 , and at least part of the surface of the main shaft 130 , which can enhance the wear resistance, corrosion resistance, and overall performance of these components.

[0113] Specifically, the eccentric portion 120 is a key part of the shaft 100 that generates centrifugal force and affects the performance of the device. The white bright layer 200 is arranged on at least part of the surface of the eccentric portion 120 to enhance its wear resistance and corrosion resistance, and also helps to maintain the stability of its shape and size.

[0114] The secondary shaft 140 is usually connected to the eccentric part 120 and bears a certain load and friction. The white bright layer 200 is arranged on at least part of the surface of the secondary shaft 140 to improve its wear resistance and load-bearing capacity, thereby extending the service life of the secondary shaft 140.

[0115] The main shaft 130 is the main bearing component in the shaft body 100, and its performance directly affects the overall operation effect of the equipment. Arranging the white bright layer 200 on at least part of the surface of the main shaft 130 can significantly improve its wear resistance and fatigue resistance, and ensure the stability and reliability of the main shaft 130 during long-term operation.

[0116] Specifically, the white bright layer 200 is arranged on the entire surface of the eccentric portion 120 , the entire surface of the secondary shaft 140 and the entire surface of the main shaft 130 , which comprehensively improves the wear resistance and corrosion resistance of the eccentric portion 120 , the secondary shaft 140 and the main shaft 130 .

[0117] In one embodiment of the present invention, a compressor is provided, comprising a crankshaft as in any of the above embodiments, so that the compressor has all the beneficial effects of the crankshaft as in any of the above embodiments.

[0118] Furthermore, the compressor also includes a motor, a pump body, a closed casing and a liquid storage tank.

[0119] In one embodiment of the present invention, a refrigeration device is provided, including a crankshaft as in any of the above embodiments, or a compressor as in any of the above embodiments, so that the refrigeration device has all the beneficial effects of the crankshaft as in any of the above embodiments or the compressor as in any of the above embodiments.

[0120] Specifically, the refrigeration equipment is an air conditioner, a refrigerator, a wine cabinet or a freezer.

[0121] In the claims, specification and drawings of the present invention, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, which is only for the purpose of more conveniently describing the present invention and making the description process simpler, rather than indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limiting the present invention; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on the specific circumstances of the above data.

[0122] In the claims, specification and drawings of the present invention, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0123] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A crankshaft, characterized in that: The crankshaft is used for a compressor, and the crankshaft comprises: Axis body; A white bright layer, the white bright layer being arranged at least in a region of the surface of the shaft body for mounting a piston or a bearing of the compressor; An oxide layer is arranged on a side of the white bright layer away from the shaft body.

2. The crankshaft according to claim 1, characterized in that The thickness of the oxide layer is greater than or equal to 0.1 micrometer and less than or equal to 1 micrometer.

3. The crankshaft according to claim 1, characterized in that The thickness of the white bright layer is greater than or equal to 3 microns.

4. The crankshaft according to claim 1, characterized in that The surface roughness of the white bright layer is greater than or equal to Rz1.2 and less than or equal to Rz3.

5.

5. The crankshaft according to claim 1, characterized in that The shaft body is a shaft body made of medium carbon steel or a shaft body made of cast iron.

6. The crankshaft according to claim 1, characterized in that The shaft body is a steel shaft body formed by high temperature hot forging.

7. The crankshaft according to any one of claims 1 to 5, characterized in that The shaft body comprises: eccentric part; A main shaft, the main shaft is connected to the eccentric portion and is located on one side of the eccentric portion in the axial direction; The auxiliary shaft is connected to the eccentric portion and is located at the other side of the eccentric portion in the axial direction.

8. The crankshaft according to claim 7, characterized in that The outer diameter of the shaft body is a first diameter D1; The minimum thickness of the oxide layer is a first thickness H; The first thickness and the first diameter satisfy the following relationship: 0.00007D1≤H≤0.0004D1.

9. The crankshaft according to claim 7, characterized in that The white bright layer is arranged on at least a portion of the surface of the eccentric portion, at least a portion of the surface of the secondary shaft, and at least a portion of the surface of the primary shaft.

10. A compressor, characterized in that: Comprising a crankshaft as claimed in any one of claims 1 to 9.

11. A refrigeration device, characterized in that: Comprising a crankshaft as claimed in any one of claims 1 to 9, or a compressor as claimed in claim 10.

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