Bearing structure, compressor and refrigeration equipment

Abstract

The invention discloses a bearing structure, a compressor and refrigeration equipment, and the bearing structure comprises a support which is provided with a shaft sleeve mounting hole; the shaft sleeve is arranged in the shaft sleeve mounting hole, the shaft sleeve extends from the first end to the second end in the axial direction, the shaft sleeve is provided with a crankshaft mounting shaft hole penetrating from the first end to the second end, the shaft sleeve forms a contact section and a suspension section in the direction from the first end to the second end, and the contact section of the shaft sleeve is assembled in the shaft sleeve mounting hole in an interference fit mode; the suspended section extends out of the bracket by a certain length along the axial direction; the crankshaft comprises a main shaft part and an eccentric part, the main shaft part is mounted in the crankshaft mounting shaft hole, and the eccentric part is supported at the first end of the shaft sleeve; wherein the support is provided with an oil collecting ring groove on the periphery of the shaft sleeve mounting hole, and the first end of the shaft sleeve is provided with an oil seepage channel communicated with the oil collecting ring groove and the crankshaft mounting shaft hole. The compressor can be ensured to be in a good lubrication state when the compressor is started next time, dry friction is avoided, the performance of the compressor is improved, and the service life of a friction pair of the compressor is effectively protected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressors, and particularly to a bearing structure, a compressor and a refrigeration device. BACKGROUND

[0002] The refrigerator compressor is usually a reciprocating piston compressor. The motor drives the crankshaft connecting rod mechanism to act on the piston to complete the reciprocating motion of the piston. When the compressor is working, the crankshaft rotates at high speed, and the friction pairs move relatively quickly. Therefore, the friction pairs must be well lubricated from the beginning to ensure the service life of the friction pairs. Therefore, the compressor housing bottom stores refrigeration oil. When the crankshaft rotates at high speed, the refrigeration oil is driven upward by centrifugal force, and then lubricates the friction pairs such as shaft hole and cylinder hole. However, it takes a certain time for the refrigeration oil to rise from the bottom of the housing to the shaft hole and the cylinder hole, forming a window period. During this period, the friction pairs cannot be well lubricated, which may cause problems such as increased friction resistance and wear of the friction pairs.

[0003] When the compressor of the refrigerator is working, the temperature inside the refrigerator gradually decreases, and after the temperature is drawn, the compressor stops, and the refrigerator is in a heat preservation state. When the temperature inside the refrigerator slowly rises to the threshold value of the compressor starting, the compressor is powered on and runs. That is, the working mode of the compressor is periodic start-stop operation. When the compressor is working, the crankshaft pumps the refrigeration oil in the oil pool at the bottom of the housing to each friction pair to play a good lubricating effect. When the compressor stops, the refrigeration oil of the core friction pair flows back to the oil pool at the bottom of the housing, and the refrigeration oil of the friction pair becomes dry under the high-temperature baking of the motor. When the compressor is started again, the crankshaft needs to pump oil from the oil pool at the bottom of the housing to each friction pair for lubrication, which takes a certain time. During this process, the crankshaft, connecting rod, piston and other friction pairs are in a dry friction state, the friction work of the compressor increases greatly, the wear of the friction pairs increases, and even the friction pairs are stuck.

[0004] The existing refrigerator compressor usually includes a cylinder seat, a crankshaft, a connecting rod, a piston, a motor stator and rotor, etc. The cylinder seat is made of cast iron material, the cylinder seat is provided with a shaft hole for assembling the crankshaft, and the cylinder seat is provided with a cylinder hole for assembling the piston. The cast iron cylinder seat structure is heavy, the processing process is complex, and the process cost is high. Therefore, the cast iron cylinder seat can be replaced by a thin-walled steel plate stamping support, the support is provided with a shaft sleeve mounting hole and other structures, forming a light weight compressor structure, reducing the weight, reducing the process difficulty, and reducing the compressor cost. In order to install the crankshaft, a shaft sleeve needs to be designed, which is pressed into the shaft sleeve mounting hole of the support by cold pressing assembly process. During the cold pressing process, the contact force of the strength will cause the deformation of the shaft sleeve and the local inner diameter to be reduced, which reduces the assembly gap between the shaft hole and the crankshaft, or even the gap disappears, which causes the friction force between the shaft hole and the crankshaft to increase greatly, or even the shaft hole and the crankshaft are stuck.

[0005] Therefore, the problems in the prior art need to be solved urgently. SUMMARY

[0006] The present application aims to at least solve one of the problems in the prior art, and provide a bearing structure, a compressor and a refrigeration device.

[0007] The technical scheme adopted by the present application to solve the technical problems is: In a first aspect, a bearing structure comprises: A bracket is formed by punching and bending a plate material, and the bracket is provided with a shaft sleeve mounting hole; A shaft sleeve is arranged in the shaft sleeve mounting hole, and the shaft sleeve extends from a first end to a second end in an axial direction, the shaft sleeve is provided with a crankshaft mounting shaft hole extending from the first end to the second end, the shaft sleeve forms a contact section and a suspended section in the direction from the first end to the second end, the contact section of the shaft sleeve is assembled in the shaft sleeve mounting hole by interference fit, and the suspended section extends out of the bracket by a certain length in the axial direction; A crankshaft comprises a main shaft part and an eccentric part, the main shaft part is mounted in the crankshaft mounting shaft hole, and the eccentric part is supported on the first end of the shaft sleeve. The bracket is provided with an oil collecting ring groove around the shaft sleeve mounting hole, and the first end of the shaft sleeve is provided with an oil seepage channel communicating the oil collecting ring groove and the crankshaft mounting shaft hole.

[0008] In combination with the first aspect, in some implementations of the first aspect, an outer peripheral surface of the main shaft part of the crankshaft is provided with a spiral oil groove, the eccentric part is provided with an inclined oil hole extending to the outer peripheral surface of the main shaft part and intersecting the spiral oil groove at the outer peripheral surface of the main shaft part.

[0009] In combination with the first aspect and the above implementations, in some implementations of the first aspect, the bracket is provided with an oil collecting plate outside the oil collecting ring groove, and a top surface of the oil collecting plate forms an inclined slope surface towards the oil collecting ring groove.

[0010] In combination with the first aspect and the above implementations, in some implementations of the first aspect, a wall of the shaft sleeve is formed between an inner peripheral surface of the crankshaft mounting shaft hole and an outer peripheral surface of the shaft sleeve, a wall thickness of the shaft sleeve at the contact section is greater than a wall thickness of the shaft sleeve at the suspended section, the shaft sleeve is in a cylindrical shape, the crankshaft mounting shaft 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.

[0011] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the sleeve is provided with an annular groove extending circumferentially along the crankshaft mounting shaft hole on the axial end face of the first end, 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, 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.

[0012] 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.

[0013] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the oil seepage channel includes an oil seepage slit or an oil seepage hole arranged on the outer ring, and the oil seepage channel is arranged radially along the crankshaft mounting shaft hole or inclined along the rotation direction of the crankshaft.

[0014] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, a magnetic ring is provided in the annular groove.

[0015] In a second aspect, a compressor comprises the bearing structure described in any implementation manner in the first aspect.

[0016] In a third aspect, a refrigeration device comprises the compressor described in any implementation of the second aspect.

[0017] One of the above technical solutions has at least one of the following advantages or beneficial effects: the present invention provides an oil collecting ring groove around the shaft sleeve mounting hole of the bracket, and provides an oil seepage channel at the first end of the shaft sleeve. The bracket collects the refrigeration oil in the oil collecting ring groove, and enters the crankshaft mounting shaft hole through the oil seepage channel to lubricate the shaft hole friction pair when the compressor is in the shutdown state, ensuring that the compressor is in a well-lubricated state when it is started next time, avoiding the occurrence of dry friction, improving the performance of the compressor, and effectively protecting the life of the compressor friction pair.

[0018] 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

[0019] 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: Figure 1 1 is a schematic structural diagram of an embodiment of the stent of the present invention; Figure 2is a structural schematic diagram of an embodiment of the shaft sleeve of the present application; Figure 3 is a structural schematic diagram of an embodiment of the crankshaft of the present application; Figure 4 is a structural schematic diagram of an embodiment of the crankshaft of the present application, showing the intersection of the inclined oil hole and the spiral oil groove; Figure 5 is a structural schematic diagram of an embodiment of the bracket, shaft sleeve and crankshaft after installation; Figure 6 is a structural schematic diagram of an inner ring and an outer ring of an embodiment of the shaft sleeve of the present application; Figure 7 is a structural sectional view of an embodiment of the shaft sleeve of the present application, showing the formation of the oil infiltration channel by a radial oil infiltration seam; Figure 8 is a structural sectional view of an embodiment of the shaft sleeve of the present application, showing the formation of the oil infiltration channel by an obliquely arranged oil infiltration seam. DETAILED DESCRIPTION

[0020] This part will describe the specific embodiments of the present application in detail, and the preferred embodiments of the present application are shown in the accompanying drawings, which serve to supplement the description in the text part of the specification and enable people to intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0021] In the present application, if the directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical scheme 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.

[0022] 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", "exceeding" 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, it is only 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 the sequence of indicated technical features.

[0023] In the present application, unless otherwise explicitly defined, the words such as "arrange", "mount", "connect" and the like shall be understood in a broad sense, for example, can be directly connected, can also be indirectly connected through an intermediate medium; can be fixedly connected, can also be detachably connected, and can also be integrally formed; can be mechanically connected, can also be electrically connected or capable of communicating with each other; can be the communication or interaction relationship between two elements. The person 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 solution.

[0024] wherein, Figure 5 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 directions shown in the drawings. Figure 5

[0025] Referring to Figures 1-5 The embodiment of the present application provides a bearing structure, which comprises a bracket 100, a shaft sleeve 200 and a crankshaft 300. The bracket 100 is formed by stamping and bending a plate material. 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, thereby forming a lightweight compressor structure, reducing weight, reducing process difficulty and reducing compressor cost.

[0026] The shaft sleeve 200 can be made by a powder metallurgy process. The shaft sleeve 200 is arranged in the shaft sleeve mounting hole 101. The shaft sleeve 200 extends along the axial direction from a first end 201 to a second end 202. The shaft sleeve 200 is provided with a crankshaft mounting shaft hole 205 extending from the first end 201 to the second end 202. The shaft sleeve 200 forms a contact section 203 and a suspended section 204 along the direction from the first end 201 to the second end 202. The contact section 203 of the shaft sleeve 200 is assembled in the shaft sleeve mounting hole 101 by interference fit. The suspended section 204 extends out of the bracket 100 by a certain length along the axial direction.

[0027] The crankshaft 300 comprises a main shaft part 301 and an eccentric part 302. The main shaft part 301 is mounted in the crankshaft mounting shaft hole 205. The eccentric part 302 is supported on the first end 201 of the shaft sleeve 200.

[0028] The bracket 100 is provided with an oil collecting ring groove 102 around the shaft sleeve mounting hole 101. The first end 201 of the shaft sleeve 200 is provided with an oil permeation channel 206 communicating the oil collecting ring groove 102 and the crankshaft mounting shaft hole 205.

[0029] In combination with Figure 5 ​The present application is provided with an oil collecting ring groove 102 on the periphery of the bracket 100 at the shaft sleeve mounting hole 101, the shaft sleeve 200 cooperates with the oil collecting ring of the bracket 100 to form an oil pool capable of storing a certain amount of refrigerant oil, the shaft sleeve 200 is provided with an oil seepage channel 206 at the first end 201, the bracket 100 collects the refrigerant oil in the oil collecting ring groove 102, and the refrigerant oil enters the crankshaft mounting shaft hole 205 through the oil seepage channel 206, lubricates the shaft hole friction pair in the compressor shutdown state, ensures that the compressor can be in a good lubricated state when it is started next time, avoids the occurrence of dry friction, improves the performance of the compressor, and effectively protects the service life of the compressor friction pair.

[0030] In some embodiments, referring to Figure 3 、 Figure 4 , the outer peripheral surface of the main shaft part 301 of the crankshaft 300 is provided with a spiral oil groove 303, and the eccentric part 302 is provided with an inclined oil hole 304 extending to the outer peripheral surface of the main shaft part 301 and intersecting with the spiral oil groove 303 at the outer peripheral surface of the main shaft part 301. It is beneficial to quickly enter the inclined oil hole 304 of the eccentric part 302 of the refrigerant oil, and then lubricate the connecting rod, piston, piston pin and other parts in the form of splash lubrication.

[0031] In some embodiments, referring to Figure 1 、 Figure 5 , the bracket 100 is provided with an oil collecting plate 103 outside the oil collecting ring groove 102, and the top surface of the oil collecting plate 103 forms an inclined slope surface to the oil collecting ring groove 102. The surface of the oil collecting plate 103 is in an inclined state, and the funnel-shaped oil collecting plate 103 of the bracket 100 guides the collected refrigerant oil to the oil collecting ring groove 102 for storage for oil seepage of the oil seepage channel 206. The seepage time is the compressor shutdown time.

[0032] In some embodiments, referring to Figure 2 、 Figure 5 、 Figure 6 , the inner peripheral surface of the crankshaft mounting shaft hole 205 and the outer peripheral surface of the shaft sleeve 200 form the wall 207 of the shaft sleeve 200, the wall thickness of the shaft sleeve 200 at the contact section 203 is greater than that of the overhanging section 204, the shaft sleeve 200 is in a cylindrical shape, the crankshaft mounting shaft hole 205 and the outer peripheral surface of the shaft sleeve 200 are coaxially arranged, and the outer peripheral surface of the shaft sleeve 200 forms a step between the contact section 203 and the overhanging section 204.

[0033] The shaft sleeve 200 is divided into two sections, the upper section cooperates with the shaft sleeve mounting hole 101 of the bracket 100 to form a contact section 203, and is assembled into an integral body by a cold pressing process or the like; the lower section has no contact with the bracket 100 and forms a suspended section 204. The interference fit formed by the cold pressing assembly process will generate strong fastening force in the contact section 203, which will squeeze the shaft sleeve 200 inward, causing the inner diameter of the shaft sleeve 200 to locally shrink, seriously affecting the cylindricity of the shaft hole, causing the assembly gap between the crankshaft 300 and the shaft hole to locally decrease and be uneven, causing the friction between the shaft hole and the crankshaft 300 to increase and reduce the compressor efficiency, and even causing the assembly gap to disappear and causing the crankshaft 300 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 203 is greater than that of the lower suspended section 204, so the thicker contact section 203 can increase the ability to resist cold deformation, and after interference assembly, the local deformation of the shaft hole is reduced, the cylindricity of the shaft hole is improved, and the risk of poor cylindricity of the shaft hole is alleviated.

[0034] Further, referring to Figure 2 、 Figure 5 , the shaft sleeve 200 is provided with an annular groove 208 extending in the circumferential direction along the shaft hole 205 of the crankshaft at the axial end face of the first end 201, the annular groove 208 extends in the axial direction to a certain depth in the contact section 203, the contact section 203 forms an outer ring 209 outside the annular groove 208, the contact section 203 forms an inner ring 210 inside the annular groove 208, and the outer ring 209 and the inner ring 210 are connected at the groove bottom of the annular groove 208.

[0035] On the one hand, the annular groove 208 can reduce the contact area between the upper end face of the shaft sleeve 200 and the support surface of the crankshaft 300, and reduce the friction resistance. On the other hand, by setting the contact section 203 as an inner ring 210 + outer ring 209 structure, the outer ring 209 is cold-pressed with the bracket 100, the stress generated by the cold pressing is lowered, and the local deformation is also lowered, which is transmitted to the inner ring 210 through the connection part of the outer ring 209 and the inner ring 210, forming local deformation. Because the outer ring 209 forms a cantilever beam above the connection part, it can withstand a larger deformation without affecting the shape of the inner ring 210, greatly reducing the local deformation of the inner ring 210, and further improving the cylindricity of the shaft hole.

[0036] Further, referring to Figure 5 、 Figure 6The inner circumferential surface of the crankshaft mounting shaft hole 205 is provided with an annular clearance groove 211 at the position corresponding to the groove bottom of the annular groove 208, which is radially outwardly recessed from the inner circumferential surface of the crankshaft mounting shaft hole 205. The annular clearance groove 211 is not in contact with the crankshaft 300, and the area outside the annular clearance groove 211 is the crankshaft 300 mounting area. The shaft hole deformation caused by cold pressing assembly is reduced and falls into the annular clearance groove 211, and the crankshaft 300 mounting area is not deformed, so that the cold pressing assembly deformation has no effect on the assembly of the crankshaft 300, and the problem of poor assembly gap between the crankshaft 300 and the shaft hole is completely solved.

[0037] In order to further reduce the frictional resistance between the upper end surface of the shaft sleeve 200 and the crankshaft support surface, see Figure 6 , the axial end surface of the inner ring 210 is sunken, and a height difference h is formed between the axial end surface of the inner ring 210 and the axial end surface of the outer ring 209. The contact between the upper end surface of the inner ring 210 and the crankshaft support surface is avoided, and the frictional resistance is further reduced. The upper end surface of the outer ring 209 supports the crankshaft, 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.

[0038] In some embodiments, see Figure 2 , Figure 6 , the oil infiltration channel 206 includes an oil infiltration slot 212 arranged on the outer ring 209, which is a narrow gap with a width of 0.01-0.5mm and a depth of 0.1-5mm. The oil infiltration slot 212 communicates the oil collecting ring groove 102 of the bracket 100 and the shaft sleeve mounting hole 101 of the shaft sleeve 200. Because the oil infiltration slot 212 is a narrow gap, the refrigerant oil cannot flow through quickly, so it will not affect the oil pumping amount of the crankshaft 300 during normal operation of the compressor, that is, it will not cause the situation that the refrigerant oil leaks a lot through the oil infiltration slot 212 and cannot effectively supply the refrigerant oil to each friction pair. When the compressor is stopped, the refrigerant oil in the shaft hole flows back to the oil pool at the bottom of the shell, and the friction pair becomes dry. At this time, the refrigerant oil stored in the oil collecting ring groove 102 of the bracket 100 slowly infiltrates into the shaft hole friction pair through the oil infiltration slot 212, so that the shaft hole friction pair is always in a fully lubricated state, and there is no dry friction stage when the compressor is started again, effectively protecting the reliability of the compressor friction pair.

[0039] It can be understood that the oil infiltration channel 206 can also be circular or other shapes, see Figure 8 , the oil infiltration channel 206 can also be arranged as an oil infiltration hole 213.

[0040] Among them, see Figure 2 , Figure 7, the oil permeation channel 206 is arranged along the radial direction of the crankshaft mounting shaft hole 205 or is arranged obliquely along the rotation direction of the crankshaft 300. The oblique direction of the oil permeation channel 206 is consistent with the rotation direction of the crankshaft 300, so that the rotation of the internal refrigerant oil can drive the internal flow of the refrigerant oil in the oil permeation channel 206, and the refrigerant oil cannot be leaked out. The oil supply capacity of the refrigerant oil when the compressor is normally operated is ensured to be sufficient.

[0041] In some embodiments, referring to Figure 5 The annular groove 208 is provided with a magnetic ring 214. The magnetic ring 214 is a circular arc shape and is installed at the bottom of the annular groove 208. During the manufacturing of the compressor, iron debris is inevitably left, and when the refrigerant oil is introduced into the refrigerant oil through the oil permeation channel 206 of the shaft sleeve 200, there is a certain probability that very small iron debris will be introduced into the shaft hole friction pair, causing the crankshaft 300 to be worn and stuck. The magnetic ring 214 is installed at the bottom of the annular groove 208 and is used to adsorb the iron debris in the refrigerant oil, thereby playing a role in filtering the refrigerant oil and effectively protecting the service life of the shaft hole friction pair and other friction pairs.

[0042] The embodiments of the present application also provide a compressor comprising the compressor crankshaft 300 mounting structure in any one of the above embodiments.

[0043] The embodiments of the present application also provide a refrigeration device comprising the compressor in any one of the above embodiments.

[0044] In the description of the present application, the description of the terms "example", "embodiment" or "some embodiments" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained 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.

[0045] 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 disposed in the shaft sleeve mounting hole, the shaft sleeve extending 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, the shaft sleeve forming a contact section and a suspended section along a direction from the first end to the second end, the contact section of the shaft sleeve being assembled in the shaft sleeve mounting hole by an interference fit, and the suspended section extending axially beyond the bracket by a certain length; A crankshaft comprising a main shaft portion and an eccentric portion, wherein the main shaft portion is mounted in the crankshaft mounting shaft hole, and the eccentric portion is supported by the first end of the sleeve; Wherein, the bracket is provided with an oil collecting ring groove around the shaft sleeve mounting hole, and the first end of the shaft sleeve is provided with an oil seepage channel communicating with the oil collecting ring groove and the crankshaft mounting shaft hole.

2. The bearing structure according to claim 1, characterized in that: A spiral oil groove is provided on the outer circumference of the main shaft portion of the crankshaft, and an inclined oil hole is provided on the eccentric portion. The inclined oil hole extends to the outer circumference of the main shaft portion and intersects with the spiral oil groove on the outer circumference of the main shaft portion.

3. The bearing structure according to claim 1, characterized in that: The bracket is provided with an oil collecting plate on the outer side of the oil collecting ring groove, and the top surface of the oil collecting plate forms a slope inclined toward the oil collecting ring groove.

4. The bearing structure according to claim 1, characterized in that: The wall of the sleeve is formed between the inner circumferential surface of the crankshaft mounting shaft hole and the outer circumferential surface of the sleeve. The wall thickness of the sleeve in the contact section is greater than the wall thickness of the suspended section. The sleeve is cylindrical. The crankshaft mounting shaft hole is coaxially arranged with the outer circumferential surface of the sleeve. The outer circumferential surface of the sleeve forms a step between the contact section and the suspended section.

5. The bearing structure according to claim 4, characterized in that: The sleeve is provided with an annular groove extending along the circumference of the crankshaft mounting shaft hole on the axial end surface of the first end, and the annular groove extends to a certain depth in the axial direction of 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. The outer ring and the inner ring are connected at the bottom of the annular groove.

6. The bearing structure according to claim 5, 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.

7. The bearing structure according to claim 5, characterized in that: The oil seepage channel includes an oil seepage slit or an oil seepage hole provided on the outer ring. The oil seepage channel is provided along the radial direction of the crankshaft mounting shaft hole or is provided obliquely along the rotation direction of the crankshaft.

8. The bearing structure according to claim 5, characterized in that: A magnetic ring is arranged in the annular groove.

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.

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