CN113623226A

CN113623226A - Bearing assembly, compressor and refrigerating device

Info

Publication number: CN113623226A
Application number: CN202111012612.9A
Authority: CN
Inventors: 张添; 聂军
Original assignee: Anhui Meizhi Precision Manufacturing Co Ltd
Current assignee: Anhui Meizhi Precision Manufacturing Co Ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2021-11-09

Abstract

The invention discloses a bearing assembly, a compressor and a refrigerating device, wherein the bearing assembly comprises a bearing part and a heat insulation part, one side of the bearing part along the axial direction is provided with a first side wall used for connecting a cylinder, the heat insulation part is arranged on the first side wall, the heat conductivity coefficient of the heat insulation part is smaller than that of the bearing part, the bearing assembly replaces at least part of the bearing part to be contacted with a refrigerant in the cylinder through the heat insulation part, and the heat conductivity coefficient of the heat insulation part is smaller than that of the bearing part, so that the heat transfer between the bearing assembly and the low-temperature refrigerant in the cylinder can be effectively reduced, the heating of the low-temperature refrigerant in the cylinder by external high-temperature refrigerant is reduced, the overheating degree of the low-temperature refrigerant in the cylinder is reduced, the refrigerant amount entering the cylinder is favorably improved, the energy efficiency ratio of the compressor is improved, and the heat insulation part is arranged on the inner side of the bearing part and is directly contacted with the refrigerant in the cylinder, therefore, a better heat insulation effect can be realized only by arranging the heat insulation part with a smaller area.

Description

Bearing assembly, compressor and refrigerating device

Technical Field

The invention relates to the field of compressors, in particular to a bearing assembly, a compressor and a refrigerating device.

Background

In the related art, a pump body part of the rotary compressor, such as a bearing, is mainly made of a metal material, but the metal material has a relatively high thermal conductivity coefficient, and when the compressor works, the pump body compresses an externally sucked low-temperature and low-pressure refrigerant into a high-temperature and high-pressure refrigerant and discharges the high-temperature and high-pressure refrigerant into a shell of the compressor.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the bearing assembly with good heat insulation effect.

The invention also provides a compressor with the bearing assembly.

The invention further provides a refrigerating device with the compressor.

According to an embodiment of the first aspect of the present invention, a bearing assembly includes a bearing portion having a first side wall for connecting a cylinder on one side in an axial direction, and a heat insulating portion provided on the first side wall, wherein a thermal conductivity of the heat insulating portion is smaller than a thermal conductivity of the bearing portion.

The bearing assembly according to the embodiment of the first aspect of the invention has at least the following advantages: the bearing assembly is provided with the heat insulation part on the first side wall of the bearing part, so that at least part of the bearing part is replaced by the heat insulation part to be in contact with the refrigerant in the cylinder, and the heat conductivity coefficient of the heat insulation part is smaller than that of the bearing part, so that the heat transfer between the bearing assembly and the low-temperature refrigerant in the cylinder can be effectively reduced, the heating of the low-temperature refrigerant in the cylinder by the external high-temperature refrigerant is reduced, the overheating degree of the low-temperature refrigerant in the cylinder is reduced, the improvement of the refrigerant amount entering the cylinder is facilitated, and the energy efficiency ratio of the compressor is improved. And because the heat insulation part is arranged at the inner side of the bearing part and is in direct contact with the refrigerant in the cylinder, the heat insulation part with a smaller area is only required to be arranged, so that a better heat insulation effect can be realized.

According to some embodiments of the invention, the bearing assembly further comprises a connector, the insulation being mounted to the first sidewall by the connector.

According to some embodiments of the invention, the bearing portion is provided with a coupling hole, the heat insulating portion is provided with a fitting hole, and the coupling member is inserted through the fitting hole and the coupling hole to mount the heat insulating portion to the first side wall.

According to some embodiments of the present invention, the connection hole is provided in plurality, and the plurality of connection holes are provided at intervals in a circumferential direction of the bearing portion.

According to some embodiments of the invention, the first side wall is provided with a sink, the insulation being embedded in the sink.

According to some embodiments of the invention, the first side wall is provided with an injection molding cavity, and the heat insulation part is formed in the injection molding cavity in an injection molding mode.

According to some embodiments of the invention, the injection molding cavity is provided with a clamping position extending along the radial direction of the bearing portion, and the heat insulation portion is provided with a clamping block matched with the clamping position.

According to some embodiments of the invention, the clamping site is a clamping ring or a clamping lug.

According to some embodiments of the invention, the thermal conductivity of the thermal insulation is less than or equal to 0.3W/(m × K).

According to some embodiments of the invention, the thickness of the thermal insulation is greater than or equal to 3 mm.

A compressor according to an embodiment of the second aspect of the present invention comprises a cylinder having a cavity and a bearing assembly according to an embodiment of the first aspect of the present invention, the bearing assembly being mounted to one side of the cavity.

The compressor according to the embodiment of the second aspect of the invention has at least the following advantages: the bearing assembly of the compressor is provided with the heat insulation part, the heat insulation part can reduce the heating of external high-temperature refrigerants to low-temperature refrigerants in the cylinder cavity, and the energy efficiency ratio of the compressor is favorably improved.

According to some embodiments of the invention, the cavity has an open portion, and the heat insulating portion is covered at the open portion.

According to some embodiments of the invention, the bearing assembly is provided in two, and the two bearing assemblies are mounted on both sides of the cavity in the axial direction.

The refrigeration device according to the embodiment of the third aspect of the invention comprises the compressor according to the embodiment of the second aspect of the invention.

According to the refrigeration device of the third aspect of the invention, at least the following advantages are achieved: the compressor is arranged in the refrigerating device, and the bearing assembly of the compressor has a good heat insulation effect, so that the overheating degree of a low-temperature refrigerant in the cylinder can be reduced, the energy efficiency ratio of the compressor is improved, and the refrigerating effect of the refrigerating device is improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is an exploded view of a bearing assembly according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the bearing assembly of FIG. 1;

FIG. 3 is an exploded view of a bearing assembly according to another embodiment of the present invention;

FIG. 4 is a cross-sectional view of the bearing assembly of FIG. 3;

FIG. 5 is a cross-sectional view of a bearing assembly of yet another embodiment of the present invention;

FIG. 6 is a cross-sectional view of a bearing assembly according to another embodiment of the present invention;

FIG. 7 is an exploded view of a bearing assembly in accordance with a further embodiment of the present invention;

FIG. 8 is a cross-sectional view of the bearing assembly of FIG. 7;

fig. 9 is a sectional view of a compressor according to an embodiment of the present invention (a lower bearing is provided with a heat insulating portion);

fig. 10 is a sectional view of a compressor according to another embodiment of the present invention (the upper bearing is provided with a heat insulating portion);

fig. 11 is a sectional view of a compressor according to still another embodiment of the present invention (both the upper bearing and the lower bearing are provided with a heat insulating portion).

Reference numerals:

a bearing portion 100; a first sidewall 110; a fitting hole 111; a sink 112; an injection molding cavity 113; a card location 114; a second sidewall 120;

a heat insulating part 200; a connection hole 210; a clamping block 220;

a connecting member 300;

a cylinder 400; a cavity 410;

a piston 500;

crankshaft 600.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly defined, terms such as set, mounted, connected, assembled, matched and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the terms in the present invention by combining the specific contents of the technical solutions.

In the related art, a pump body part of the rotary compressor, such as a bearing, is mainly made of a metal material, but the metal material has a relatively high thermal conductivity coefficient, when the compressor operates, a low-temperature and low-pressure refrigerant sucked from the outside is compressed by the pump body to form a high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant is discharged out of the compressor through an exhaust pipe of the casing, however, the high-temperature and high-pressure refrigerant in the casing can transfer heat to the low-temperature and low-pressure refrigerant in the pump body through the bearing, so that the low-temperature refrigerant in the pump body is heated and expands in volume, and the amount of the refrigerant capable of entering the pump body for compression in one compression stroke is reduced, thereby reducing the energy efficiency of the compressor. In order to solve at least one technical problem, the invention provides a bearing assembly which has a good heat insulation effect, can reduce the heat transfer of an external high-temperature refrigerant to a low-temperature refrigerant in a cylinder through the bearing assembly, and is beneficial to improving the refrigerant compression amount of a compressor and improving the energy efficiency ratio of the compressor.

Referring to fig. 1 to 2, a bearing assembly according to an embodiment of a first aspect of the present invention is applied to a compressor. The compressor is provided with an upper bearing and a lower bearing at two sides along the axial direction, and the bearing assembly can be one of the upper bearing and the lower bearing. Specifically, the bearing assembly includes a bearing portion 100 and a heat shield portion 200. The bearing portion 100 may be made of a metal material, which has high strength. The heat insulating portion 200 is made of a material having low thermal conductivity and high strength, and has a smaller thermal conductivity than the bearing portion 100, so that the heat transfer efficiency of the heat insulating portion 200 with respect to the bearing portion 100 is lower, the heat transfer can be reduced, and the heat insulating effect can be achieved. The bearing portion 100 has a first side wall 110 and a second side wall 120 on two sides in the axial direction, wherein the first side wall 110 is installed and connected to one side of a cavity 410 of a cylinder 400 of the compressor, the second side wall 120 is located on one side of the bearing portion 100 departing from the cavity 410 of the cylinder 400, that is, the first side wall 110 is located on the inner side of the bearing portion 100, the second side wall 120 is located on the outer side of the bearing portion 100, and the heat insulation portion 200 is disposed on the inner side of the bearing portion 100 and is matched with the bearing portion 100 to be hermetically connected to one side of the cavity 410 of the cylinder 400.

Referring to fig. 1 and 2, the bearing assembly is provided with the heat insulation portion 200 on the first side wall 110 of the bearing portion 100, so that the heat insulation portion 200 replaces at least part of the bearing portion 100 to be in contact with the refrigerant in the cylinder 400, and since the heat conductivity coefficient of the heat insulation portion 200 is smaller than that of the bearing portion 100, the heat transfer between the bearing assembly and the low-temperature refrigerant in the cylinder 400 can be effectively reduced, thereby reducing the heating of the low-temperature refrigerant in the cylinder 400 by the external high-temperature refrigerant, reducing the degree of superheat of the low-temperature refrigerant in the cylinder 400, reducing the volume expansion of the low-temperature refrigerant in the cylinder 400 due to superheat, facilitating the increase of the amount of the refrigerant entering the cylinder 400, and improving the energy efficiency ratio of the compressor. Furthermore, since the heat insulating part 200 is disposed inside the bearing part 100, and the heat insulating part 200 is in direct contact with the refrigerant in the cylinder 400, a good heat insulating effect can be achieved only by disposing the heat insulating part 200 with a small area, and compared to a scheme in which the heat insulating part 200 is disposed outside the bearing part 100, the heat insulating part 200 required by the present invention has a smaller area, which is beneficial to reducing the amount of heat insulating material used and reducing the manufacturing cost of the bearing assembly.

Referring to fig. 2, 4 to 6, it can be understood that in some embodiments of the present invention, the bearing assembly further includes a connector 300, and the heat insulating part 200 is connected to the bearing part 100 through the connector 300. Specifically, the connecting member 300 may be a fastening member such as a bolt or a pin, and the connecting member 300 is inserted into the heat insulating portion 200 and the bearing portion 100 to connect and fix the two.

Referring to fig. 1 and 3, in the above embodiment, it should be noted that the first sidewall 110 is provided with the connection hole 210, the heat insulating part 200 is provided with the fitting hole 111, and the connection member 300 is inserted through the fitting hole 111 and the connection hole 210 to connect the heat insulating part 200 to the first sidewall 110 of the bearing part 100. The connecting hole 210 and the mating hole 111 may be threaded holes, and the connecting member 300 may be a corresponding mating fastener such as a bolt or a pin. Of course, the connecting hole 210 and the matching hole 111 may be other types of holes, and the connecting member 300 may be other types of fasteners.

Referring to fig. 1, it may be understood that, in some embodiments of the present invention, the first sidewall 110 is provided with a plurality of connection holes 210, the plurality of connection holes 210 are spaced apart from each other on the first sidewall 110 along a circumferential direction of the bearing portion 100, and the number of the connection members 300 is the same as the number of the connection holes 210. For example, when the connecting member 300 is a bolt, the bolt may be provided with two or more numbers, and a plurality of bolts may be spaced apart from each other, for example, may be spaced apart from each other along the circumferential direction of the bearing portion 100, so that the connecting position between the heat insulating portion 200 and the bearing portion 100 is increased, which is beneficial to improving the stability of the heat insulating portion 200 mounted and connected to the bearing portion 100.

Referring to fig. 3 and 4, it can be understood that in some embodiments of the present invention, the end surface of the first sidewall 110 is provided with the sink 112, and the thermal insulation part 200 is embedded in the sink 112 and then coupled and fixed by the coupling member 300. The first side wall 110 is provided with the sink 112, and the shape of the sink 112 is adapted to the outer shape of the heat insulating portion 200, so that the heat insulating portion 200 can be more closely attached to the bearing portion 100. Specifically, the thermal insulation portion 200 may be embedded in the sink 112 by an interference fit or a small clearance fit.

It can be understood that when the bearing portion 100 is provided with the exhaust hole, the heat insulation portion 200 may also be provided with a corresponding matching exhaust hole, referring to fig. 6, at this time, the heat insulation portion 200 may be directly mounted on the first sidewall 110 through the connecting member 300, at this time, the area of the heat insulation portion 200 may be set to be relatively large, and may be set to be disc-shaped, so that the heat insulation portion 200 has a relatively good heat insulation effect, but at this time, the axial dimension of the bearing assembly is relatively large. Of course, the heat insulation part 200 may be provided with no matching exhaust holes by avoiding the exhaust holes, and referring to fig. 5, at this time, the heat insulation part 200 may be embedded and installed in the sinking position 112 by providing the sinking position 112 because the heat insulation part 200 needs to avoid the exhaust holes, and the heat insulation part 200 may be in a fan shape or a circular ring shape, at this time, the area of the heat insulation part 200 is relatively small, the heat insulation effect is relatively poor, but the axial size of the bearing assembly is relatively small at this time.

Referring to fig. 7 and 8, it can be understood that, in some embodiments of the present invention, the heat insulation portion 200 may also be formed on the bearing portion 100 by injection molding, so that the bearing portion 100 and the heat insulation portion 200 can be an integral structure, which facilitates subsequent processing of the bearing assembly, and the bearing assembly is simpler to assemble and more efficient to install because the bearing assembly does not need to adopt a connection structure to connect the heat insulation portion 200 to the bearing portion 100. Specifically, the first side wall 110 is provided with an injection molding cavity 113, the second side wall 120 is provided with an injection molding hole communicated with the injection molding cavity 113, and during manufacturing, liquid low-heat-conductivity high-strength material is injected into the injection molding cavity 113 through an injection molding port, so that the heat insulation portion 200 is formed in the injection molding cavity 113.

Referring to fig. 7, in the above embodiment, it can be understood that, the injection molding cavity 113 may be provided with the clamping position 114, and the clamping position 114 is disposed along the radial extension of the bearing portion 100, so that when the thermal insulation portion 200 is injection molded into the injection molding cavity 113, the thermal insulation portion 200 may be formed with the clamping block 220 matched with the clamping position 114, and the clamping block 220 is clamped in the clamping position 114, so that the bearing portion 100 can limit the thermal insulation portion 200 in the axial direction and the radial direction, thereby improving the connection stability between the thermal insulation portion 200 and the bearing portion 100.

Referring to fig. 7 and 8, it can be understood that, in the above embodiment, the clamping position 114 may be disposed at an end of the bottom of the injection molding cavity 113 away from the center of the bearing portion 100, and may be an annular position, and the clamping block 220 is a matching clamping ring, so that the clamping ring can be clamped in the annular position, thereby greatly improving the reliability of the connection between the heat insulation portion 200 and the bearing portion 100. Of course, the clamping position 114 can also be arranged at one end of the top of the injection molding cavity 113 deviating from the center of the bearing portion 100, and the clamping position 114 can be in the shape of a lug, at this time, the clamping position 114 can be provided with a plurality of clamping positions 114 arranged along the circumferential direction of the bearing portion 100 at intervals, correspondingly, at this time, the clamping block 220 is also provided with a plurality of clamping positions 114 in one-to-one correspondence, and at this time, the heat insulation portion 200 and the bearing portion 100 can also have good connection strength.

Referring to fig. 7 and 8, of course, in some embodiments, the clamping position 114 may include both of the above two types, that is, the bottom of the injection molding cavity 113 is provided with the annular clamping position 114, and the top of the injection molding cavity 113 is also provided with the lug-shaped clamping position 114, so that after the thermal insulation part 200 is formed by injection molding into the injection molding cavity 113, the connection strength between the thermal insulation part 200 and the bearing part 100 is higher.

It is understood that the thermal conductivity of the material of which the thermal insulation portion 200 is made needs to be small enough to provide the thermal insulation portion 200 with a good thermal insulation effect. To this end, in some embodiments of the present invention, the thermal insulation 200 is made of a material having a thermal conductivity of 0.3W/(m · K) or less, where the thermal conductivity is 1 kelvin across a surface of 1m thick of the material under stable heat transfer conditions, and the heat transferred over a period of time of 1 square meter area is in watts/meter · degree (W/(m · K), where K can be replaced by ° c). Through a large number of experiments by the applicant, it is found that when the heat insulation part 200 is made of a material having a thermal conductivity of 0.3W/(m × K) or less, the heat insulation part 200 can block external heat well, and prevent the heat from being transferred to the inside of the cylinder 400 to heat a low-temperature refrigerant inside the cylinder 400. Specifically, the material of the heat insulation portion 200 may be epoxy glass fiber reinforced plastic, which has relatively low material cost and is relatively convenient to process.

It can be understood that, during the operation of the compressor, the piston 500 compresses the refrigerant in the compression cavity of the cylinder 400, and the pressure inside the refrigerant is higher. The heat insulating part 200 is installed inside the bearing part 100 and hermetically connected to one side of the cylinder 400, and the refrigerant has a large pressure to the heat insulating part 200, so the heat insulating part 200 generally needs a certain strength to prevent the heat insulating part 200 from being damaged by the pressure. For this reason, in some embodiments of the present invention, the thickness of the heat insulation part 200 is set to be greater than or equal to 3mm, and by setting the thickness of the heat insulation part 200 to a value of 3mm or more, the strength of the heat insulation part 200 can be made sufficiently high so that it can withstand a large pressure without being damaged, improving the stability of the operation of the compressor.

Referring to fig. 9 to 11, a compressor in accordance with an embodiment of the second aspect of the present invention includes a bearing assembly in accordance with an embodiment of the first aspect of the present invention. Of course, the compressor further includes a cylinder 400, the cylinder 400 having a cavity 410, and a bearing assembly mounted outside the cavity 410 of the cylinder 400. Specifically, referring to fig. 10, the bearing assembly may be an upper bearing mounted to one side of the cylinder 400 in the axial direction, and referring to fig. 9, the bearing assembly may be a lower bearing mounted to the other side of the cylinder 400 in the axial direction. The bearing assembly comprises a bearing portion 100 and a heat insulation portion 200, wherein the heat insulation portion 200 is arranged on the first side wall 110 of the bearing portion 100, and the heat insulation portion 200 is matched with the first side wall 110 and hermetically connected to the outer side of a cavity 410 of the cylinder 400.

The bearing assembly of the compressor is provided with the heat insulation part 200, the heat insulation part 200 can reduce the heating of the external high-temperature refrigerant to the low-temperature refrigerant in the cavity 410 of the cylinder 400, thereby reducing the overheating degree of the low-temperature refrigerant in the cavity 410 of the cylinder 400, reducing the volume expansion of the low-temperature refrigerant in the cavity 410 caused by overheating, being beneficial to improving the refrigerant entering the cavity 410 of the cylinder 400, improving the energy efficiency ratio of the compressor and improving the performance of the compressor.

Referring to fig. 9 to 11, it should be noted that the cavity 410 generally has an opening, and the crankshaft 600 extends into the cavity 410 through the opening to drive the piston 500 in the cavity 410 to compress the refrigerant. The bearing assembly is installed outside the cavity 410, and the heat insulation part 200 is covered on the open part at this time, so that the contact area between the bearing part 100 and the refrigerant in the cavity 410 can be reduced as much as possible, and the heat transfer of the bearing part 100 to the refrigerant in the cavity 410 can be reduced. In one embodiment, the shape of the thermal insulation part 200 is matched to the shape of the open part, so that a better thermal insulation effect can be achieved by minimizing the number of thermal insulation materials. Of course, in other embodiments, the thermal insulation portion 200 may be provided to be larger or smaller than the opening portion, and the present invention is not limited thereto.

It can be understood that the bottom of the shell of the compressor is usually provided with engine oil, the lower portion of the cylinder 400 is usually immersed in the engine oil, the temperature of the engine oil is usually relatively high, and the engine oil with a high temperature also has a heating effect on the low-temperature refrigerant in the cavity 410 of the cylinder 400. Therefore, referring to fig. 11, in some embodiments, two bearing assemblies are provided, two sides of the cavity 410 in the axial direction are provided with open portions, the two bearing assemblies are respectively installed at the corresponding open portions, the two bearing assemblies are an upper bearing and a lower bearing, at this time, the upper bearing can reduce heating of a low-temperature refrigerant of the cavity 410 by a high-temperature refrigerant, and the lower bearing can reduce heating of the low-temperature refrigerant in the cavity 410 by the high-temperature refrigerant and high-temperature engine oil, so that the degree of superheat of the low-temperature refrigerant in the cavity 410 of the cylinder 400 is further reduced, and the energy efficiency ratio of the compressor is favorably improved.

The refrigeration device of the embodiment of the third aspect of the invention comprises the compressor of the embodiment of the second aspect of the invention. The refrigerating device can be an air conditioner, a refrigerator or other types of refrigerating equipment. The compressor is arranged in the refrigerating device, and the bearing assembly of the compressor has a good heat insulation effect, so that the overheating degree of the low-temperature refrigerant in the air cylinder 400 can be reduced, the energy efficiency ratio of the compressor is improved, and the refrigerating effect of the refrigerating device is improved.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. A bearing assembly, comprising:

a bearing portion having a first side wall for connecting a cylinder at one side in an axial direction;

a heat insulation part arranged on the first side wall;

wherein a thermal conductivity of the heat insulating portion is smaller than a thermal conductivity of the bearing portion.

2. The bearing assembly of claim 1, wherein: the bearing assembly further includes a connector through which the heat insulating portion is mounted to the first sidewall.

3. The bearing assembly of claim 2, wherein: the bearing portion is provided with a connecting hole, the heat insulation portion is provided with a matching hole, and the connecting piece penetrates through the matching hole and the connecting hole so that the heat insulation portion is installed on the first side wall.

4. The bearing assembly of claim 3, wherein: the connecting holes are arranged in a plurality of numbers, and the connecting holes are arranged at intervals along the circumferential direction of the bearing portion.

5. The bearing assembly of claim 2, wherein: the first side wall is provided with a sinking position, and the heat insulation part is embedded in the sinking position.

6. The bearing assembly of claim 1, wherein: the first side wall is provided with an injection molding cavity, and the heat insulation part is formed in the injection molding cavity in an injection molding mode.

7. The bearing assembly of claim 6, wherein: the injection molding cavity is provided with an edge the radially extending clamping position of the bearing part, and the heat insulation part is provided with a clamping block matched with the clamping position.

8. The bearing assembly of claim 7, wherein: the clamping position is a clamping ring or a clamping lug.

9. The bearing assembly of claim 1, wherein: the thermal conductivity of the thermal insulation portion is less than or equal to 0.3W/(m K).

10. The bearing assembly of claim 1, wherein: the thickness of the heat insulation part is greater than or equal to 3 mm.

11. A compressor, characterized by comprising:

a cylinder having a cavity;

the bearing assembly of any of claims 1 to 10, mounted to one side of the cavity.

12. The compressor of claim 11, wherein: the cavity has an opening portion, and the heat insulation portion cover is located the opening portion.

13. The compressor of claim 11, wherein: the bearing assemblies are arranged on two sides of the cavity along the axial direction.

14. A refrigeration appliance comprising a compressor as claimed in any one of claims 11 to 13.