Bearing structure, compressor and refrigeration equipment
By adopting the plate stamping and bending bracket and segmented shaft sleeve design in the refrigerator compressor, the problems of bulky cast iron cylinder seat and deformation of shaft sleeve are solved, achieving the effect of lightweighting, reducing costs and improving efficiency.
Patent Information
- Application Number
- CN202510853855.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-24
- Publication Date
- 2025-10-10
AI Technical Summary
In existing refrigerator compressors, the cast iron cylinder seat has a bulky structure, complex processing and high cost. The cold pressing deformation of the sleeve leads to uneven clearance between the shaft hole and the crankshaft, increased friction and even jamming.
The bracket is made of sheet metal by stamping and bending. The shaft sleeve is divided into a contact section and a suspended section. The wall thickness of the contact section is greater than that of the suspended section. It is assembled through interference fit to increase the ability to resist cold pressure deformation and reduce friction.
Improves the cylindricity of the shaft hole, reduces friction, avoids jamming, improves compressor efficiency and reduces costs.
Smart Images
Figure CN120759734A_ABST
Abstract
Description
Technical Field
[0001] The present invention is used in the field of compressors, and in particular relates to a bearing structure, a compressor and a refrigeration device. Background Art
[0002] Existing refrigerator compressors usually include components such as a cylinder block, crankshaft, connecting rod, piston, and motor stator and rotor. The cylinder block is made of cast iron and is provided with an axial hole for assembling the crankshaft and a cylinder hole for assembling the piston. The cast iron cylinder block is bulky, the processing process is complex, and the process cost is high. Therefore, the cast iron cylinder block can be replaced with a bracket stamped from thin-walled steel plate. The bracket is provided with a shaft sleeve mounting hole and other structures to form a lightweight compressor structure, reducing weight, reducing process difficulty, and reducing compressor cost. In order to install the crankshaft, a shaft sleeve needs to be designed. The shaft sleeve is pressed into the shaft sleeve mounting hole of the bracket using a cold pressing assembly process. The cold pressing process generates strong contact force, causing the shaft sleeve to deform and the local inner diameter to shrink, reducing the assembly clearance between the shaft hole and the crankshaft, or even eliminating the clearance, resulting in a significant increase in friction between the shaft hole and the crankshaft, or even jamming.
[0003] In summary, the problems existing in the relevant technologies need to be solved urgently. Summary of the Invention
[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a bearing structure, a compressor and a refrigeration device.
[0005] The technical solution adopted by the present invention to solve its technical problem is:
[0006] In a first aspect, a bearing structure includes:
[0007] The bracket is formed by stamping and bending a plate, and the bracket is provided with a shaft sleeve mounting hole;
[0008] A shaft sleeve extends axially from a first end to a second end, the shaft sleeve being provided with a crankshaft mounting shaft hole extending from the first end to the second end, a shaft sleeve wall being formed between an inner circumferential surface of the crankshaft mounting shaft hole and an outer circumferential surface of the shaft sleeve, the shaft sleeve forming a contact section and a suspended section along a direction from the first end to the second end, the wall thickness of the shaft sleeve in the contact section being greater than the wall thickness of the suspended section;
[0009] The contact section of the shaft sleeve is assembled in the shaft sleeve mounting hole by interference fit, and the suspended section extends axially out of the bracket by a certain length.
[0010] In combination with the first aspect, in certain implementations of the first aspect, the sleeve is cylindrical, the crankshaft mounting hole is coaxially arranged with the outer circumferential surface of the sleeve, and the outer circumferential surface of the sleeve forms a step between the contact section and the suspended section.
[0011] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, the bracket is provided with a flange extending along the axial bending in the sleeve mounting hole, the contact section of the sleeve is sleeved on the flange, and the axial length of the contact section is not less than the axial length of the flange.
[0012] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, a groove is provided on the axial end surface of the first end of the sleeve.
[0013] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the groove includes an annular groove extending along the circumference of the crankshaft mounting shaft hole.
[0014] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the annular groove extends axially to a certain depth in the contact section, the contact section forms an outer ring on the outside of the annular groove, and the contact section forms an inner ring on the inside of the annular groove, and the outer ring and the inner ring are connected at the bottom of the annular groove.
[0015] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, an annular air avoidance groove is provided on the inner circumferential surface of the crankshaft mounting shaft hole at a position corresponding to the bottom of the annular groove, and the annular air avoidance groove is radially recessed outward from the inner circumferential surface of the crankshaft mounting shaft hole.
[0016] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the axial end face of the inner ring is sunken and forms a height difference with the axial end face of the outer ring.
[0017] In a second aspect, a compressor comprises the bearing structure described in any implementation manner in the first aspect.
[0018] In a third aspect, a refrigeration device comprises the compressor described in any implementation of the second aspect.
[0019] One of the above technical solutions has at least one of the following advantages or beneficial effects: the sleeve is divided into two sections, the upper section cooperates with the sleeve mounting hole of the bracket to form a contact section, and is assembled into a whole by a cold pressing process or the like; the lower section has no contact relationship with the bracket, forming a suspended section. Because the interference fit formed by processes such as cold pressing assembly will generate a strong fastening force in the contact section, squeezing the sleeve inward, resulting in a local reduction in the inner diameter of the sleeve, seriously affecting the cylindricity of the shaft hole, causing the assembly gap between the crankshaft and the shaft hole to become locally smaller and uneven, resulting in an increase in the friction between the shaft hole and the crankshaft and reducing the efficiency of the compressor, and even causing the assembly gap to disappear and causing the crankshaft to become stuck. The sleeve of the present invention adopts a design with different wall thicknesses. The wall thickness of the upper contact section is greater than the wall thickness of the lower suspended section. Therefore, the thicker contact section can increase the ability to resist cold pressing deformation. After interference assembly, the local deformation of the shaft hole is reduced, the poor cylindricity of the shaft hole is improved, and the risk of poor cylindricity of the shaft hole is alleviated.
[0020] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:
[0022] Figure 1 1 is a schematic structural diagram of an embodiment of the stent of the present invention;
[0023] Figure 2 1 is a schematic structural diagram of an embodiment of a shaft sleeve of the present invention;
[0024] Figure 3 1 is a schematic structural diagram of an embodiment of a crankshaft of the present invention;
[0025] Figure 4 This is a schematic structural diagram of an embodiment of the present invention after the bracket, sleeve and crankshaft are installed;
[0026] Figure 5 1 is a schematic structural diagram of another embodiment of the shaft sleeve of the present invention. DETAILED DESCRIPTION
[0027] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.
[0028] In the present application, if the direction (up, down, left, right, front and back) is described, it is only for the convenience of describing the technical solutions of the present application, and is not intended to indicate or imply that the indicated technical features must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0029] In the present application, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "more than" and the like are understood as not including the number; "above", "below", "within" and the like are understood as including the number. In the description of the present application, if "first" and "second" are described, they are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.
[0030] In the present application, unless otherwise explicitly limited, the words "set", "install", "connect" and the like should be broadly understood, for example, they can be directly connected, or indirectly connected through an intermediate medium; can be fixedly connected, or can be detachably connected, or can be integrally formed; can be mechanically connected, or can be electrically connected or capable of communicating with each other; can be the communication or interaction relationship between two elements or the interaction relationship between two elements. The skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solutions.
[0031] wherein, Figure 4 The reference direction coordinate system of the embodiment of the present application is given, and the embodiment of the present application is described below in combination with the direction shown in the drawings. Figure 4
[0032] Referring to Figures 1-4 The embodiment of the present application provides a bearing structure, which comprises a bracket 100 and a shaft sleeve 200, wherein the bracket 100 is formed by stamping and bending a plate material, and the bracket 100 is provided with a shaft sleeve mounting hole 101. The bracket 100 of the embodiment of the present application is formed by stamping and bending a plate material, forming a lightweight compressor structure, reducing weight, reducing process difficulty and reducing compressor cost. The shaft sleeve 200 can be made by a powder metallurgy process, and the shaft sleeve 200 extends from a first end 201 to a second end 202 in the axial direction. The shaft sleeve 200 is provided with a crankshaft mounting shaft hole 203 which penetrates from the first end 201 to the second end 202. The inner periphery of the crankshaft mounting shaft hole 203 and the outer periphery of the shaft sleeve 200 form a wall 204 of the shaft sleeve 200. The shaft sleeve 200 forms a contact section 205 and a suspended section 206 in the direction from the first end 201 to the second end. The wall thickness of the shaft sleeve 200 at the contact section 205 is greater than the wall thickness of the shaft sleeve 200 at the suspended section 206.
[0033] The contact section 205 of the shaft sleeve 200 is assembled in the shaft sleeve mounting hole 101 by interference fit, and the overhanging section 206 extends in the axial direction by a certain length from the bracket 100.
[0034] In combination Figure 4 , the shaft sleeve 200 is divided into upper and lower sections. The upper section cooperates with the shaft sleeve mounting hole 101 of the bracket 100 to form the contact section 205, which is assembled as a whole by cold pressing process or the like. The lower section has no contact with the bracket 100 and forms the overhanging section 206. Because the interference fit formed by the cold pressing process or the like will generate strong fastening force on the contact section 205, the shaft sleeve 200 is pressed inward, resulting in local reduction of the inner diameter of the shaft sleeve 200, which seriously affects the cylindricity of the shaft hole, causes the assembly gap between the crankshaft and the shaft hole to be locally reduced and uneven, and causes the friction between the shaft hole and the crankshaft to be increased, thereby reducing the efficiency of the compressor, and even causing the assembly gap to disappear and the crankshaft to be stuck. The shaft sleeve 200 of the present application is designed with different wall thicknesses. The wall thickness of the upper contact section 205 is greater than that of the lower overhanging section 206. Therefore, the thicker contact section 205 can increase the ability to resist cold deformation, and the local deformation of the shaft hole is reduced after interference assembly, the cylindricity of the shaft hole is improved, and the risk of poor cylindricity of the shaft hole is alleviated.
[0035] It can be understood that the crankshaft mounting shaft hole 203 of the shaft sleeve 200 is used to provide rotational support for the crankshaft 300, which is provided in a standard or approximately standard circular shape, and the outer peripheral surface of the shaft sleeve 200 can be provided in a square, circular or other shape.
[0036] In some embodiments, referring to Figure 2 , the shaft sleeve 200 is in a cylindrical shape, the crankshaft mounting shaft hole 203 is coaxially arranged with the outer peripheral surface of the shaft sleeve 200, and the outer peripheral surface of the shaft sleeve 200 forms a step between the contact section 205 and the overhanging section 206. In this embodiment, the shaft sleeve 200 is in a cylindrical shape, the wall thickness is uniform in the circumferential direction, the structural strength is better, and the manufacturing is convenient.
[0037] In some embodiments, referring to Figure 4 , the bracket 100 is provided with a flange 102 extending in the axial direction by bending at the shaft sleeve mounting hole 101, and the contact section 205 of the shaft sleeve 200 is sleeved on the flange 102. The axial length of the contact section 205 is not less than the axial length of the flange 102, that is, the axial length of the contact section 205 is greater than or equal to the axial length of the flange 102. In this embodiment, by providing the flange 102 extending in the axial direction on the bracket 100, the assembly length of the bracket 100 and the shaft sleeve 200 can be increased, and the installation stability of the bracket 100 and the shaft sleeve 200 can be improved. At the same time, by increasing the contact area between the bracket 100 and the shaft sleeve 200, the local force of the bracket 100 on the shaft sleeve 200 can be effectively reduced, the local deformation of the shaft hole can be reduced, the cylindricity of the shaft hole can be improved, and the risk of poor cylindricity of the shaft hole can be effectively alleviated.
[0038] The wall thickness of the upper section of the bushing 200 is increased, and the width of the upper end surface is increased accordingly, so the contact area with the support surface of the crankshaft is increased, which greatly increases the frictional resistance and reduces the efficiency of the compressor. In some embodiments, referring to Figure 2 、 Figure 3 、 Figure 4 The axial end surface of the first end 201 of the bushing 200 is configured to cooperate with the support surface 301 of the crankshaft 300, and the axial end surface of the first end 201 of the bushing 200 is provided with a groove 207. The groove 207 can reduce the contact area between the upper end surface of the bushing 200 and the support surface of the crankshaft, thereby reducing the frictional resistance. At the same time, the avoidance groove can store a small amount of refrigeration oil to lubricate the upper end surface, further reducing the frictional resistance and greatly improving the efficiency of the compressor.
[0039] Further, referring to Figure 2 The groove 207 includes an annular groove 211 extending along the circumference of the crankshaft mounting shaft hole 203. The annular groove 211 divides the upper end surface into an inner ring and an outer ring, thereby reducing the contact area between the upper end surface of the bushing 200 and the support surface of the crankshaft and reducing the frictional resistance.
[0040] The thickened upper section of the bushing 200 still has a certain amount of deformation after cold pressing, which still affects the assembly clearance between the shaft hole and the crankshaft. Referring to Figure 5 In some embodiments, the annular groove 211 extends a certain depth in the axial direction at the contact section 205, the contact section 205 forms an outer ring 208 on the outside of the annular groove 211, and the contact section 205 forms an inner ring 209 on the inside of the annular groove 211, and the outer ring 208 and the inner ring 209 are connected at the bottom of the annular groove 211. The outer ring 208 is cold-pressed and assembled with the bracket 100, and the stress generated by cold pressing is downward, and the local deformation is also downward, which is transmitted to the inner ring 209 through the connection part of the outer ring 208 and the inner ring 209, thereby forming local deformation. Because the outer ring 208 forms a cantilever beam above the connection part, it can withstand a larger amount of deformation without affecting the shape of the inner ring 209, greatly reducing the local deformation of the shaft hole of the inner ring 209, and further improving the cylindricity of the shaft hole.
[0041] Further, referring to Figure 5 The inner circumferential surface of the crankshaft mounting shaft hole 203 is provided with an annular avoidance groove 210 at a position corresponding to the bottom of the annular groove 211, and the annular avoidance groove 210 is recessed outwardly in the radial direction from the inner circumferential surface of the crankshaft mounting shaft hole 203. The annular avoidance groove 210 does not contact the crankshaft, and the area outside the annular avoidance groove 210 is the crankshaft mounting area. The deformation of the shaft hole caused by cold pressing is reduced and falls into the annular avoidance groove 210, and the crankshaft mounting area is not deformed, so the cold pressing deformation has no effect on the assembly of the crankshaft, and the pain point of the poor assembly clearance between the crankshaft and the shaft hole is completely solved.
[0042] To further reduce the frictional resistance between the upper end surface of the shaft sleeve 200 and the bearing surface of the crankshaft, referring to Figure 5 The axial end surface of the inner ring 209 is sunken, and a height difference h is formed between the axial end surface of the inner ring 209 and the axial end surface of the outer ring 208. The contact between the upper end surface of the inner ring 209 and the bearing surface of the crankshaft is avoided, and the frictional resistance is further reduced. The crankshaft is supported by the upper end surface of the outer ring 208, and the distance from the support point to the center of the crankshaft is far, and the support arm is long, so it is beneficial to reduce the influence of the crankshaft overturning moment on the frictional force of the upper end surface, and to reduce the contact pressure of the upper end surface.
[0043] Embodiments of the present application also provide a compressor comprising the compressor shaft sleeve 200 mounting structure in any of the above embodiments.
[0044] Embodiments of the present application also provide a refrigeration device comprising the compressor in any of the above embodiments.
[0045] In the description of the present application, the description of the terms "example", "embodiment" or "some embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0046] Of course, the present application is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.
Claims
1. A bearing structure, characterized in that: include: The bracket is formed by stamping and bending a plate, and the bracket is provided with a shaft sleeve mounting hole; A shaft sleeve extends axially from a first end to a second end, the shaft sleeve being provided with a crankshaft mounting shaft hole extending from the first end to the second end, a shaft sleeve wall being formed between an inner circumferential surface of the crankshaft mounting shaft hole and an outer circumferential surface of the shaft sleeve, the shaft sleeve forming a contact section and a suspended section along a direction from the first end to the second end, the wall thickness of the shaft sleeve in the contact section being greater than the wall thickness of the suspended section; The contact section of the shaft sleeve is assembled in the shaft sleeve mounting hole by interference fit, and the suspended section extends axially out of the bracket by a certain length.
2. The bearing structure according to claim 1, characterized in that: The shaft sleeve is cylindrical, the crankshaft mounting hole is coaxially arranged with the outer peripheral surface of the shaft sleeve, and the outer peripheral surface of the shaft sleeve forms a step between the contact section and the suspended section.
3. The bearing structure according to claim 1, characterized in that: The bracket is provided with a flange extending and bending along the axial direction in the sleeve mounting hole, the contact section of the sleeve is sleeved on the flange, and the axial length of the contact section is not less than the axial length of the flange.
4. The bearing structure according to claim 1, characterized in that: The shaft sleeve is provided with a groove on an axial end surface of the first end.
5. The bearing structure according to claim 4, characterized in that: The groove includes an annular groove extending along the circumference of the crankshaft mounting shaft hole.
6. The bearing structure according to claim 5, characterized in that: The annular groove extends axially to a certain depth in the contact section. The contact section forms an outer ring outside the annular groove, and the contact section forms an inner ring inside the annular groove. The outer ring and the inner ring are connected at the bottom of the annular groove.
7. The bearing structure according to claim 6, characterized in that: The inner circumference of the crankshaft mounting shaft hole is provided with an annular air-avoiding groove at a position corresponding to the groove bottom of the annular groove. The annular air-avoiding groove is recessed radially outward from the inner circumference of the crankshaft mounting shaft hole.
8. The bearing structure according to claim 6, characterized in that: The axial end surface of the inner ring is sunken and forms a height difference with the axial end surface of the outer ring.
9. A compressor, characterized in that: The bearing structure comprises the bearing structure according to any one of claims 1 to 8.
10. A refrigeration device, characterized in that: Including the compressor according to claim 9.