Crankshafts, crankshaft assemblies and compressors

Abstract

The present application relates to a crankshaft, a crankshaft assembly and a compressor. The crankshaft assembly includes: a crankshaft, including a shaft body and an eccentric body, the eccentric body including a main body and an eccentric part, the main body is connected to the shaft body, and the eccentric part is protruding and arranged on one side of the radial direction of the main body; a roller, which is sleeved outside the eccentric body, and the roller and the eccentric part are coaxially sleeved. There is a gap between the outer peripheral wall of the main body and the inner peripheral wall of the roller. In this way, the centrifugal force generated by the axis of the main body pointing to the axis of the eccentric part during the rotation of the roller will not be transmitted from the roller to the main body, and then will not be transmitted to the crankshaft, so as to reduce the centrifugal force of the crankshaft during rotation. The balancing block corresponding to the centrifugal force of the crankshaft can also reduce the mass. If the crankshaft rotates at high speed, it is not necessary to configure a balancing block with a large mass, and the disturbance of the crankshaft will not increase, which can meet the design requirements of high-speed operation of the compressor.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to a crankshaft, a crankshaft assembly and a compressor. Background Art

[0002] The compressor is a driven fluid machine that boosts low-pressure gas to high-pressure gas. It is the heart of the refrigeration system. It sucks low-temperature and low-pressure refrigerant gas from the intake pipe, compresses it by driving the piston through the motor, and then discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe, providing power for the refrigeration cycle.

[0003] In order to reduce material costs, reduce the space occupied by compressors, and ensure the cooling capacity of compressors, current compressors are developing in the direction of high speed and miniaturization. However, the reduction in the diameter of the compressor crankshaft means a reduction in stiffness, and the increase in speed will increase the centrifugal force of the balance block on the motor rotor. The crankshaft connected to the electrode rotor will be affected by a greater centrifugal force. The increase in crankshaft disturbance will in turn affect the stress, vibration and noise of the crankshaft. Therefore, the increase in crankshaft disturbance will bring many negative effects, limiting the high-speed operation of the compressor. Summary of the invention

[0004] Based on this, it is necessary to provide a crankshaft, a crankshaft assembly and a compressor to address the technical problem that the high-speed operation of the compressor is limited.

[0005] A crankshaft assembly comprising:

[0006] A crankshaft, comprising a shaft body and an eccentric body, wherein the eccentric body comprises a main body and an eccentric part, wherein the main body is connected to the shaft body, and the eccentric part is protrudingly arranged on one side of the main body in a radial direction;

[0007] A roller is sleeved outside the eccentric body, and the roller and the eccentric part are coaxially sleeved;

[0008] The eccentric portion is fitted and sleeved with the inner circumferential wall of one side of the roller at least at two opposite ends along its radial direction, and a gap exists between at least part of the outer circumferential wall of the main body and the inner circumferential wall of the other side of the roller.

[0009] In the above crankshaft assembly, there is a gap between the outer circumferential wall of the main body and the inner circumferential wall of the roller, which is equivalent to setting a gap between the main body and the roller after the eccentric part and the roller are coaxially sleeved and assembled and fixed. In this way, the centrifugal force generated during the rotation of the roller and directed from the axis of the main body to the axis of the eccentric part will not be transmitted from the roller to the main body, and then will not be transmitted to the crankshaft, so as to reduce the centrifugal force of the crankshaft during rotation. In this way, the balancing block configured corresponding to the centrifugal force of the crankshaft can also reduce the mass, thereby reducing the force of the balancing block on the crankshaft and reducing the disturbance of the crankshaft. In this way, the crankshaft does not need to receive the centrifugal force of the roller. If the crankshaft rotates at high speed, there is no need to configure a balancing block with a larger mass. At the same time, the disturbance of the crankshaft will not increase accordingly. Finally, the stress, vibration and noise of the crankshaft will not be greatly affected, which greatly meets the design requirements of high-speed operation of the compressor.

[0010] In some embodiments, in a first direction where the axis of the main body is connected to the axis of the eccentric portion, there is a gap between an outer peripheral wall of the main body facing away from the eccentric portion and an inner peripheral wall of the roller.

[0011] In some embodiments, the outer peripheral wall of the main body includes an inner shrinkage surface and a connecting surface, the inner shrinkage surface is located on a side of the main body facing away from the eccentric portion in the first direction, and the connecting surface is connected between the inner shrinkage surface and the eccentric portion;

[0012] There is a gap between the inner shrinkage surface and the connection surface and the inner circumferential wall of the roller.

[0013] In some embodiments, the connecting surface includes a first arcuate surface and a second arcuate surface, wherein the first arcuate surface is connected between one circumferential end of the inner contraction surface and the eccentric portion, and the second arcuate surface is connected between the other circumferential end of the inner contraction surface and the eccentric portion;

[0014] The first arcuate surface and the second arcuate surface are both located on the same first virtual circumference with the axis of the main body as the center, and the retracted surface is located inside the first virtual circumference.

[0015] In some embodiments, a portion of the outer peripheral wall of the eccentric portion is coaxially sleeved with the inner peripheral wall of the roller, and another portion of the outer peripheral wall of the eccentric portion is spaced apart from the inner peripheral wall of the roller.

[0016] In some embodiments, in a first direction where the axis of the main body is connected to the axis of the eccentric portion, the side of the eccentric portion facing away from the main body is spaced apart from the inner circumferential wall of the roller, and in a second direction intersecting the first direction and the axial direction of the shaft body, both opposite ends of the eccentric portion abut against the inner circumferential wall of the roller.

[0017] In some embodiments, the outer peripheral wall of the eccentric portion includes a first supporting arc surface, a second supporting arc surface, and a distal surface connected between the first supporting arc surface and the second supporting arc surface, the distal surface is located on the side of the eccentric portion facing away from the main body portion along the first direction, and the first supporting arc surface and the second supporting arc surface are relatively arranged along the second direction and both abut against the inner peripheral wall of the roller.

[0018] In some embodiments, the first supporting arc surface and the second supporting arc surface are both located on the same second virtual circle with the axis of the eccentric portion as the center.

[0019] In some of the embodiments, a weight-reducing groove is provided on the distal surface.

[0020] In some embodiments, the material of the roller includes zirconium oxide and / or aluminum oxide.

[0021] A crankshaft comprises a shaft body and an eccentric body arranged on the shaft body, wherein the eccentric body comprises a main body and an eccentric part, wherein the main body is connected to the shaft body, and the eccentric part is protrudingly arranged on one side of the main body in a radial direction;

[0022] The outer peripheral wall of the main body includes a first arcuate surface, a second arcuate surface and a connection between the first arcuate surface and the second arcuate surface, the first arcuate surface and the second arcuate surface are both located on the same first virtual circumference with the axis of the main body as the center, the retracted surface is located on the inner side of the virtual circumference, and in the first direction where the axis of the main body is connected to the axis of the eccentric part, the retracted surface is located on the side of the main body that is away from the eccentric part.

[0023] In some embodiments, the outer peripheral wall of the eccentric portion includes a first supporting arc surface, a second supporting arc surface and a distal surface connected between the first supporting arc surface and the second supporting arc surface, the first supporting arc surface and the second supporting arc surface are both located on the same second virtual circle with the axis of the eccentric portion as the center, and the distal surface is located on the side of the eccentric portion along the first direction facing away from the main body portion, and is located on the inner side of the second virtual circle.

[0024] In some of the embodiments, a weight-reducing groove is provided on the distal surface.

[0025] A compressor comprises the above crankshaft assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a cross-sectional schematic diagram of a compressor from one viewing angle in some embodiments of the present application;

[0027] FIG2 is a schematic structural diagram of a crankshaft from one perspective in some embodiments of the present application;

[0028] FIG3 is a cross-sectional schematic diagram of a compressor from another perspective in some embodiments of the present application;

[0029] FIG4 is a cross-sectional schematic diagram of a crankshaft assembly in some embodiments of the present application;

[0030] FIG5 is a schematic structural diagram of a crankshaft from another perspective in some embodiments of the present application;

[0031] FIG. 6 is a schematic diagram of the structure of a crankshaft in other embodiments of the present application.

[0032] Explanation of the reference numerals: 100, compressor; 10, cylinder; 20, vane; 30, crankshaft assembly; 50, crankshaft; 60, shaft body; 70, eccentric body; 72, main body; 721, retracted surface; 725, first arc surface; 727, second arc surface; 74, eccentric part; 741, first supporting arc surface; 743, second supporting arc surface; 745, distal end surface; 746, weight-reducing groove; 90, roller; A, first direction; B, second direction; c, axis center of the main body; d, axis center of the eccentric part. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0039] As described in the background technology, the crankshaft in the compressor is driven to rotate by the rotor of the motor. When the crankshaft speed is higher, the centrifugal force of the crankshaft is greater, and the mass of the balancing block that needs to be configured on the rotor must be larger to balance the centrifugal force generated when the crankshaft rotates eccentrically. However, the increase in the mass of the balancing block will lead to an increase in the disturbance of the crankshaft, which will in turn affect the stress, vibration and noise of the crankshaft, thereby limiting the high-speed operation of the compressor.

[0040] 1-3 , according to some embodiments of the present application, a compressor 100 is provided, including a cylinder 10, a vane 20 and a crankshaft assembly 30. The crankshaft assembly 30 rotates eccentrically in the cylinder 10 and pushes the vane 20 to extend and retract, so as to compress the refrigerant to form a high-pressure refrigerant during the rotation process.

[0041] The crankshaft assembly 30 includes a crankshaft 50 and a roller 90. The roller 90 is sleeved on the crankshaft 50. During the rotation of the crankshaft 50, the roller 90 is driven to rotate eccentrically. At the same time, the roller 90 pushes the slide 20 to expand and contract. During the rotation of the roller 90, the refrigerant in the cylinder 10 is compressed to finally form a high-pressure refrigerant. In addition, the crankshaft 50 is connected to the rotor of the motor. The crankshaft 50 is driven to rotate under the drive of the motor rotor. In order to balance the centrifugal force generated by the eccentric rotation of the crankshaft assembly 30 in the cylinder 10, a balancing block is generally provided on the electronic rotor to balance the centrifugal force of the eccentric rotation of the crankshaft assembly 30.

[0042] Referring to FIGS. 2 to 4 , according to some embodiments of the present application, the crankshaft 50 includes a shaft body 60 and an eccentric body 70, the eccentric body 70 includes a main body 72 and an eccentric part 74, the main body 72 is connected to the shaft body 60, the eccentric part 74 is protrudingly arranged on one side of the main body 72 in the radial direction, the roller 90 is sleeved outside the eccentric body 70, and the roller 90 and the eccentric part 74 are sleeved coaxially; the eccentric part 74 is sleeved with the inner circumferential wall of one side of the roller 90 at least at two opposite ends along its own radial direction, and there is a gap between at least part of the outer circumferential wall of the main body 72 and the inner circumferential wall of the other side of the roller 90. That is, the center of the roller 90 coincides with the center of the eccentric part 74, so that the crankshaft 50 and the roller 90 are connected by at least part of the sleeve of the roller 90 and the eccentric part 74, and when the shaft body 60 of the crankshaft 50 rotates, the roller 90 sleeved coaxially with the eccentric part 74 can be driven to rotate eccentrically.

[0043] In addition, there is a gap between the outer circumferential wall of the main body 72 and the inner circumferential wall of the roller 90, which is equivalent to setting a gap between the main body 72 and the roller 90 after the eccentric part 74 and the roller 90 are coaxially sleeved and assembled and fixed. In this way, the centrifugal force generated during the rotation of the roller 90, which is directed from the axis c of the main body 72 to the axis d of the eccentric part 74, will not be transmitted from the roller 90 to the main body 72, and further will not be transmitted to the crankshaft 50, so as to reduce the centrifugal force of the crankshaft 50 during the rotation process. In this way, the balancing block configured corresponding to the centrifugal force of the crankshaft 50 can also reduce the mass, thereby reducing the force of the balancing block on the crankshaft 50 and reducing the disturbance of the crankshaft 50. In this way, the crankshaft 50 does not need to receive the centrifugal force of the roller 90. If the crankshaft 50 rotates at a high speed, it is not necessary to configure a balancing block with a large mass, the disturbance of the crankshaft 50 will not increase, and the stress, vibration and noise of the crankshaft 50 will not be greatly affected, which can meet the design requirements of the high-speed operation of the compressor 100.

[0044] Further, in the first direction A where the axis c of the main body 72 is connected to the axis d of the eccentric part 74, there is a gap between the outer peripheral wall of the main body 72 on the side facing away from the eccentric part 74 and the inner peripheral wall of the roller 90. During the rotation of the crankshaft assembly 30, the main body 72 rotates around the axis c, and the direction of the centrifugal force generated is the direction in which the axis c of the main body 72 points to the axis d of the eccentric part 74, that is, the first direction A. Accordingly, in the first direction A, the outer peripheral wall of the main body 72 on the side facing away from the eccentric part 74 is separated from the roller 90, so that the centrifugal force generated by the roller 90 along the first direction A is prevented from being transmitted to the crankshaft 50, thereby reducing the centrifugal force during the rotation of the crankshaft 50. It can be understood that the main body 72 is coaxially arranged with the shaft body 60 of the crankshaft 50, the axis c of the main body 72 is located on the central axis of the shaft body 60, the eccentric part 74 is coaxially sleeved with the roller 90, and the axis d of the eccentric part is located on the central axis of the roller 90. In addition, the shaft 60 is coaxially arranged with the cylinder 10 , which is equivalent to the roller 90 being eccentrically arranged in the cylinder 10 , and the first direction A is also equivalent to the direction in which the center of the roller 90 is connected with the center of the cylinder 10 .

[0045] According to some embodiments of the present application, the outer peripheral wall of the main body 72 includes an inwardly contracted surface 721 and a connecting surface (not shown in the figure), the inwardly contracted surface 721 is located on the side of the main body 72 facing away from the eccentric portion 74 in the first direction A, and the connecting surface is connected between the inwardly contracted surface 721 and the eccentric portion 74. There is a gap between the inwardly contracted surface 721 and the connecting surface and the inner peripheral wall of the roller 90, that is, there is a gap between the entire outer peripheral wall of the main body 72 and the inner peripheral wall of the roller 90, so that the main body 72 is completely separated from the roller 90, and the main body 72 will not be affected by the centrifugal force of the roller 90.

[0046] Further, the connecting surface includes a first arcuate surface 725 and a second arcuate surface 727, wherein the first arcuate surface 725 is connected between one circumferential end of the inner contraction surface 721 and the eccentric portion 74, and the second arcuate surface 727 is connected between the other circumferential end of the inner contraction surface 721 and the eccentric portion 74, and the first arcuate surface 725 and the second arcuate surface 727 are both located on the same first virtual circumference with the axis c of the main body 72 as the center, and the inner contraction surface 721 is located inside the first virtual circumference. That is, the first arcuate surface 725 and the second arcuate surface 727 are partial arcuate surfaces on the first virtual circumference, and the inner contraction surface 721 is formed by cutting the first virtual circumference along the axial direction, so that a gap can be formed between the main body 72 and the roller 90 in the first direction A. It can be understood that the axis c of the main body 72 is the center of the first virtual circle where the first arc surface 725 and the second arc surface 727 are located, wherein the main body 72 is coaxially arranged with the shaft body 60, or the axis c of the main body 72 is offset from the axis of the shaft body 60.

[0047] Referring to FIGS. 3 to 5 , according to some embodiments of the present application, part of the outer peripheral wall of the eccentric portion 74 is coaxially sleeved with the inner peripheral wall of the roller 90, and another part of the outer peripheral wall of the eccentric portion 74 is spaced apart from the inner peripheral wall of the roller 90. In other words, part of the outer peripheral wall of the eccentric portion 74 is coaxially sleeved with the inner peripheral wall of the roller 90, and another part of the eccentric portion 74 is spaced apart from the roller 90, so that the entire outer periphery of the eccentric portion 74 does not need to be in contact with the roller 90, and the overall volume of the eccentric portion 74 is small, thereby reducing the mass of the eccentric portion 74, reducing the centrifugal force generated by the crankshaft 50 itself during rotation, and further reducing the centrifugal force of the crankshaft 50.

[0048] In the first direction A where the axis c of the main body 72 is connected to the axis d of the eccentric portion 74, the side of the eccentric portion 74 facing away from the main body 72 is spaced from the inner circumferential wall of the roller 90, and in the second direction B intersecting the first direction A and the axial direction of the shaft body 60, both opposite ends of the eccentric portion 74 abut against the inner circumferential wall of the roller 90. In this way, the eccentric portion 74 and the roller 90 are coaxially sleeved and installed by abutting the opposite ends of the eccentric portion 74 with the inner circumferential wall of the roller 90 in the second direction B, and at the same time, the side of the eccentric portion 74 facing away from the main body 72 in the first direction A is spaced from the roller 90 to reduce the volume of the eccentric portion 74, thereby reducing the mass of the eccentric portion 74 and the centrifugal force generated, so as to further reduce the centrifugal force received by the crankshaft 50 during rotation.

[0049] The outer peripheral wall of the eccentric portion 74 includes a first supporting arc surface 741, a second supporting arc surface 743 and a distal surface 745 connected between the first supporting arc surface 741 and the second supporting arc surface 743. The distal surface 745 is located on the side of the eccentric portion 74 that is away from the main body portion 72 along the first direction A. The first supporting arc surface 741 and the second supporting arc surface 743 are relatively arranged along the second direction B and are both in contact with the inner peripheral wall of the roller 90. In this way, the eccentric portion 74 and the roller 90 are coaxially sleeved by the relatively arranged first supporting arc surface 741 and the second supporting arc surface 743, and the distal surface 745 between the first supporting arc surface 741 and the second supporting arc surface 743 is separated from the roller 90 to reduce the volume of the eccentric portion 74.

[0050] In addition, because the main body 72 and the roller 90 are spaced apart in the first direction A, it is necessary to set a first supporting arc surface 741 and a second supporting arc surface 743 in the second direction B intersecting the first direction A to effectively support the sleeve of the crankshaft 50 and the roller 90. If the centrifugal portion is sleeved with the roller 90 on one side of the first direction A, and the main body 72 is spaced apart from the roller 90 in the first direction A, it is impossible to fix the eccentric body 70 and the roller 90 at the opposite ends of the first direction A, and the eccentric body 70 and the roller 90 cannot be effectively installed.

[0051] Further, the first supporting arc surface 741 and the second supporting arc surface 743 are both located on the same second virtual circumference with the axis d of the eccentric portion 74 as the center, wherein the axis d of the eccentric portion 74 is located on the central axis of the roller 90. During the manufacturing process, a partial cylinder is formed with the axis d of the eccentric portion 74 as the center, and then the end of the eccentric portion 74 in the first direction A is cut along the axial direction to form a distal surface 745, so as to form an eccentric portion 74 with a smaller mass that can be sleeved with the roller 90. Optionally, the distal surface 745 is a plane, or can be formed as an arc or a bent surface, etc., which is not limited here.

[0052] Referring to FIG. 6 , according to some embodiments of the present application, a weight-reducing groove 746 is provided on the distal surface 745 to further reduce the mass of the eccentric portion 74 and further reduce the centrifugal force during the rotation of the crankshaft 50. In this way, the mass of the balancing block on the motor rotor that drives the crankshaft 50 to rotate is smaller, and even the balancing block may not be required, thereby reducing the disturbance of the crankshaft 50 and allowing the crankshaft 50 to rotate at high speed.

[0053] According to some embodiments of the present application, the material of the roller 90 includes zirconium oxide and / or aluminum oxide. The roller 90 has a low mass and can allow the crankshaft 50 to rotate at a high speed, thereby meeting the requirement of high-speed operation of the compressor 100.

[0054] According to some embodiments of the present application, the present application also provides a crankshaft assembly 30 as described in any of the above embodiments. The crankshaft assembly 30 includes a crankshaft 50 and a roller 90, and the roller 90 is sleeved outside the crankshaft 50. During the rotation of the crankshaft 50, the roller 90 is driven to rotate eccentrically, and at the same time, the roller 90 pushes the slide 20 to expand and contract, and the refrigerant in the cylinder 10 is compressed during the rotation of the roller 90, and finally a high-pressure refrigerant is formed. In addition, the crankshaft 50 is connected to the rotor of the motor, and the crankshaft 50 is driven to rotate under the drive of the motor rotor. In order to balance the centrifugal force generated by the eccentric rotation of the crankshaft assembly 30 in the cylinder 10, a balancing block is generally set on the electronic rotor to balance the centrifugal force of the eccentric rotation of the crankshaft assembly 30.

[0055] The crankshaft 50 includes a shaft body 60 and an eccentric body 70, wherein the eccentric body 70 includes a main body 72 and an eccentric part 74, wherein the main body 72 is connected to the shaft body 60, and the eccentric part 74 is protrudingly arranged on one side of the main body 72 in the radial direction, and the roller 90 is sleeved outside the eccentric body 70, and the roller 90 and the eccentric part 74 are sleeved coaxially, that is, the center of the roller 90 coincides with the axis d of the eccentric part 74, so that the crankshaft 50 and the roller 90 are connected by the sleeve of the eccentric part 74 and the roller 90. When the shaft body 60 of the crankshaft 50 rotates, the roller 90 coaxially sleeved with the eccentric part 74 can be driven to rotate eccentrically.

[0056] In addition, there is a gap between the outer circumferential wall of the main body 72 and the inner circumferential wall of the roller 90, which is equivalent to setting a gap between the main body 72 and the roller 90 after the eccentric part 74 and the roller 90 are coaxially sleeved and assembled and fixed. In this way, the centrifugal force generated during the rotation of the roller 90, which is directed from the axis c of the main body 72 to the axis d of the eccentric part 74, will not be transmitted from the roller 90 to the main body 72, and further will not be transmitted to the crankshaft 50, so as to reduce the centrifugal force of the crankshaft 50 during the rotation process. In this way, the balancing block configured corresponding to the centrifugal force of the crankshaft 50 can also reduce the mass, thereby reducing the force of the balancing block on the crankshaft 50 and reducing the disturbance of the crankshaft 50. In this way, the crankshaft 50 does not need to receive the centrifugal force of the roller 90. If the crankshaft 50 rotates at a high speed, it is not necessary to configure a balancing block with a large mass, the disturbance of the crankshaft 50 will not increase, and the stress, vibration and noise of the crankshaft 50 will not be greatly affected, which can meet the design requirements of the high-speed operation of the compressor 100.

[0057] Referring to Figures 2 to 4, according to some embodiments of the present application, the present application further provides a crankshaft 50 described in any of the above embodiments, the crankshaft 50 includes a shaft body 60 and an eccentric body 70 arranged on the shaft body 60, the eccentric body 70 includes a main body 72 and an eccentric portion 74, the main body 72 is connected to the shaft body 60, the eccentric portion 74 is protruded and arranged on one side of the radial direction of the main body 72, the outer peripheral wall of the main body 72 includes a first arcuate surface 725, a second arcuate surface 727 and a connection between the first arcuate surface 725 and the second arcuate surface 727, the first arcuate surface 725 and the second arcuate surface 727 are both located on the same first virtual circumference with the axis c of the main body 72 as the center, the inner contraction surface 721 is located on the inner side of the virtual circumference, and in the first direction A connecting the axis c of the main body 72 and the axis d of the eccentric portion 74, the inner contraction surface 721 is located on the side of the main body 72 facing away from the eccentric portion 74.

[0058] The shaft body 60 of the crankshaft 50 is used to connect with the motor rotor. The eccentric body 70 of the crankshaft 50 is sleeved in the roller 90. Specifically, the eccentric portion 74 is coaxially sleeved with the roller 90, which is equivalent to the center of the roller 90 being eccentric relative to the central axis of the shaft body 60. In this way, when the crankshaft 50 rotates under the drive of the electrode rotor, it can drive the roller 90 to rotate eccentrically with the central axis of the shaft body 60 (that is, the axis c of the main body 72).

[0059] The outer peripheral wall of the main body 72 includes a retracted surface 721, a first arcuate surface 725 and a second arcuate surface 727. The first arcuate surface 725 and the second arcuate surface 727 are partial arcuate surfaces on the first virtual circle. The retracted surface 721 is a retracted surface 721 formed by axially cutting the first virtual circle, which is equivalent to axially cutting one end of the main body 72 away from the eccentric portion 74 in the first direction A to form the retracted surface 721.

[0060] In this way, when the eccentric body 70 is sleeved in the roller 90, there is a gap between the main body 72 and the inner wall of the roller 90, and the centrifugal force generated during the rotation of the roller 90, which is directed from the axis c of the main body 72 to the axis d of the eccentric part 74, will not be transmitted from the roller 90 to the main body 72, and further will not be transmitted to the crankshaft 50, so as to reduce the centrifugal force of the crankshaft 50 during the rotation process. In this way, the balancing block configured corresponding to the centrifugal force of the crankshaft 50 can also reduce the mass, thereby reducing the force of the balancing block on the crankshaft 50 and reducing the disturbance of the crankshaft 50. In this way, the crankshaft 50 does not need to receive the centrifugal force of the roller 90. If the crankshaft 50 rotates at a high speed, it is not necessary to configure a balancing block with a large mass, and the disturbance of the crankshaft 50 will not increase. The stress, vibration and noise of the crankshaft 50 will not be greatly affected, and the design requirements of the high-speed operation of the compressor 100 can be met.

[0061] The outer peripheral wall of the eccentric portion 74 includes a first arcuate supporting surface, a second arcuate supporting surface and a distal surface 745 connected between the first arcuate supporting surface and the second arcuate supporting surface. The first supporting arcuate surface 741 and the second supporting arcuate surface 743 are both located on the same second virtual circle with the axis d of the eccentric portion 74 as the center. The distal surface 745 is located on the side of the eccentric portion 74 along the first direction A that is away from the main body portion 72, and is located on the inner side of the second virtual circle.

[0062] In this way, when the roller 90 is sleeved outside the eccentric body 70, the first supporting arc surface 741 and the second supporting arc surface 743 are relatively arranged along the second direction B and both abut against the inner circumferential wall of the roller 90. In this way, the eccentric portion 74 and the roller 90 are coaxially sleeved by the relatively arranged first supporting arc surface 741 and the second supporting arc surface 743, and the distal end surface 745 between the first supporting arc surface 741 and the second supporting arc surface 743 is separated from the roller 90, thereby reducing the volume of the eccentric portion 74, and then reducing the mass of the eccentric portion 74, reducing the centrifugal force generated by the crankshaft 50 itself during rotation, and further reducing the centrifugal force of the crankshaft 50.

[0063] Moreover, the first supporting arc surface 741 and the second supporting arc surface 743 are both located on the same second virtual circumference with the axis d of the eccentric portion 74 as the center, wherein the axis d of the eccentric portion 74 is located on the central axis of the roller 90. During the manufacturing process, a partial cylinder is formed with the axis d of the eccentric portion 74 as the center, and then the end of the eccentric portion 74 in the first direction A is cut along the axial direction to form a distal surface 745, so as to form an eccentric portion 74 with a smaller mass that can be sleeved with the roller 90. Optionally, the distal surface 745 is a plane, or can be formed as an arc or a bent surface, etc., which is not limited here.

[0064] Referring to FIG. 6 , optionally, a weight-reducing groove 746 is provided on the distal surface 745 to further reduce the mass of the eccentric portion 74 and further reduce the centrifugal force during the rotation of the crankshaft 50. In this way, the mass of the balancing block on the motor rotor driving the crankshaft 50 to rotate is smaller, and even the balancing block may not be required, thereby reducing the disturbance of the crankshaft 50 and allowing the crankshaft 50 to rotate at a high speed.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A crankshaft assembly, characterized in that: include: A crankshaft, comprising a shaft body and an eccentric body, wherein the eccentric body comprises a main body and an eccentric part, wherein the main body is connected to the shaft body, and the eccentric part is protrudingly arranged on one side of the main body in a radial direction; A roller is sleeved outside the eccentric body, and the roller and the eccentric part are coaxially sleeved; Among them, the eccentric part is fitted and sleeved with the inner circumferential wall on one side of the roller at least at two opposite ends along its own radial direction, and there is a gap between at least part of the outer circumferential wall of the main body and the inner circumferential wall on the other side of the roller; in the first direction where the axis of the main body is connected to the axis of the eccentric part, there is a gap between the outer circumferential wall of the main body facing away from the eccentric part and the inner circumferential wall of the roller, and the path for the centrifugal force of the roller to be transmitted to the crankshaft along the first direction when the roller rotates is blocked.

2. The crankshaft assembly according to claim 1, characterized in that The outer peripheral wall of the main body comprises an inner shrinkage surface and a connection surface, wherein the inner shrinkage surface is located on a side of the main body facing away from the eccentric portion in the first direction, and the connection surface is connected between the inner shrinkage surface and the eccentric portion; There is a gap between the inner shrinkage surface and the connection surface and the inner circumferential wall of the roller.

3. The crankshaft assembly according to claim 2, characterized in that The connecting surface includes a first arcuate surface and a second arcuate surface, wherein the first arcuate surface is connected between one circumferential end of the inner contraction surface and the eccentric portion, and the second arcuate surface is connected between the other circumferential end of the inner contraction surface and the eccentric portion; The first arcuate surface and the second arcuate surface are both located on the same first virtual circumference with the axis of the main body as the center, and the retracted surface is located inside the first virtual circumference.

4. The crankshaft assembly according to any one of claims 1 to 3, characterized in that: A portion of the outer peripheral wall of the eccentric portion is coaxially fitted and sleeved with the inner peripheral wall of the roller, and another portion of the outer peripheral wall of the eccentric portion is spaced apart from the inner peripheral wall of the roller.

5. The crankshaft assembly according to claim 4, characterized in that In a first direction in which the axis of the main body is connected to the axis of the eccentric portion, the side of the eccentric portion facing away from the main body is spaced apart from the inner circumferential wall of the roller, and in a second direction intersecting the first direction and the axial direction of the shaft body, both opposite ends of the eccentric portion abut against the inner circumferential wall of the roller.

6. The crankshaft assembly according to claim 5, characterized in that The outer peripheral wall of the eccentric portion includes a first supporting arc surface, a second supporting arc surface and a distal surface connected between the first supporting arc surface and the second supporting arc surface, the distal surface is located on the side of the eccentric portion facing away from the main body portion along the first direction, the first supporting arc surface and the second supporting arc surface are relatively arranged along the second direction and both abut against the inner peripheral wall of the roller.

7. The crankshaft assembly according to claim 6, characterized in that The first supporting arc surface and the second supporting arc surface are both located on the same second virtual circle with the axis of the eccentric portion as the center.

8. The crankshaft assembly according to claim 6, characterized in that A weight-reducing groove is provided on the distal end surface.

9. The crankshaft assembly according to any one of claims 1 to 3, characterized in that: The material of the rollers includes zirconium oxide and / or aluminum oxide.

10. A crankshaft, sleeved on a roller, characterized in that: It comprises a shaft body and an eccentric body arranged on the shaft body, the eccentric body is sleeved outside the roller, the eccentric body comprises a main body and an eccentric part, the main body is connected to the shaft body, and the eccentric part is protrudingly arranged on one side of the main body in the radial direction; The outer peripheral wall of the main body comprises a first arcuate surface, a second arcuate surface and an indented surface connected between the first arcuate surface and the second arcuate surface, the first arcuate surface and the second arcuate surface are both located on the same first virtual circumference with the axis of the main body as the center, the indented surface is located inside the virtual circumference, and in the first direction where the axis of the main body is connected to the axis of the eccentric portion, the indented surface is located on the side of the main body facing away from the eccentric portion; In the first direction where the axis of the main body is connected to the axis of the eccentric part, there is a gap between the inner contraction surface of the main body facing away from the eccentric part and the inner circumferential wall of the roller, and the path for the centrifugal force of the roller to be transmitted to the crankshaft along the first direction when the roller rotates is blocked.

11. The crankshaft according to claim 10, characterized in that The outer peripheral wall of the eccentric portion includes a first supporting arc surface, a second supporting arc surface and a distal surface connected between the first supporting arc surface and the second supporting arc surface, the first supporting arc surface and the second supporting arc surface are both located on the same second virtual circle with the axis of the eccentric portion as the center, and the distal surface is located on the side of the eccentric portion along the first direction facing away from the main body portion, and is located on the inner side of the second virtual circle.

12. The crankshaft according to claim 11, characterized in that A weight-reducing groove is provided on the distal end surface.

13. A compressor, characterized in that: A crankshaft assembly comprising any one of claims 1 to 9.

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