CN114033690B - Pump body, compressor and refrigeration equipment - Google Patents

Abstract

The invention discloses a pump body, a compressor and refrigeration equipment, wherein the pump body comprises a cylinder assembly, a first bearing, a second bearing, a shell and a magnetic part, wherein the first bearing, the cylinder assembly and the second bearing are sequentially arranged in the shell, and an oil return channel is formed among the first bearing, the cylinder assembly, the second bearing and the shell; at least part of the magnetic piece is positioned in the oil return passage. The frozen oil carries the foreign matter and passes the oil return channel, and the magnetic part adsorbs the foreign matter, and then gets rid of the foreign matter in the frozen oil, and the wearing and tearing of parts can be reduced to clean frozen oil, and then improves the reliability of the pump body and the compressor.

Description

Pump body, compressor and refrigeration equipment

Technical Field

The invention relates to the field of electric appliances, in particular to a pump body, a compressor and refrigeration equipment.

Background

When the compressor is in operation, the compressor is a metal product, part of parts in the compressor are in a rotating friction state, and foreign matters such as metal scraps are generated during abnormal friction, so that the reliability of the compressor is reduced, and the service life of the compressor is shortened.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the pump body which can remove foreign matters in the frozen oil and improve the reliability of the compressor.

The invention also provides a compressor with the pump body and refrigeration equipment of the compressor.

According to an embodiment of the first aspect of the invention, the device comprises a cylinder assembly, a first bearing, a second bearing, a housing and a magnetic member. The first bearing, the cylinder assembly and the second bearing are sequentially arranged in the shell; an oil return channel is formed among the first bearing, the cylinder assembly, the second bearing and the shell; at least a portion of the magnetic member is located within the oil return passage.

According to the embodiment of the invention, the method has at least the following beneficial effects: the frozen oil carries the foreign matter and passes the oil return channel, and the magnetic part has adsorption affinity, and the magnetic part will be moved towards the magnetic part or adsorb from the foreign matter that the magnetic part was by-pass, and then gets rid of the foreign matter in the frozen oil. Foreign matters in the returned frozen oil are removed, so that clean frozen oil is obtained, the abrasion of parts can be reduced by the clean frozen oil, the service life of each part is further prolonged, and the reliability of the pump body and the compressor is improved.

According to some embodiments of the invention, the cylinder assembly is provided with a first oil return groove, the first bearing is provided with a second oil return groove, and the second bearing is provided with a third oil return groove, wherein the wall of the second oil return groove, the wall of the first oil return groove, the wall of the third oil return groove and the inner wall of the housing enclose the oil return channel.

According to some embodiments of the invention, the cylinder assembly comprises a first cylinder and a second cylinder, the first bearing, the first cylinder, the second cylinder and the second bearing are sequentially arranged in the shell, a first sub oil return groove and a second sub oil return groove are respectively arranged on the first cylinder and the second cylinder, and the first sub oil return groove and the second sub oil return groove are communicated to form the first oil return groove.

According to some embodiments of the invention, the magnetic element is located in the first sub-tank and/or in the second sub-tank.

According to some embodiments of the invention, a mounting groove is formed in the groove wall of the second sub oil return groove, and the magnetic piece is arranged in the mounting groove.

According to some embodiments of the present invention, the mounting groove and the magnetic member are both square structures, the length and width of the mounting groove are L1 and W1, respectively, and the length and width of the magnetic member are L2 and W2, respectively, so as to satisfy the following conditions: L1-L2 is less than or equal to 0.5mm and less than or equal to 1mm, W1-W2 is less than or equal to 0.5mm and less than or equal to 1mm.

According to some embodiments of the invention, the magnetic member is spaced from the outer circumferential surface of the second cylinder by a distance S, satisfying: s is more than or equal to 0.3mm and less than or equal to 0.6mm.

According to some embodiments of the invention, a portion of the magnetic member is located on a centerline of the oil return passage.

According to some embodiments of the invention, the magnetic element is a permanent magnet or an electromagnet.

According to an embodiment of the second aspect of the invention, there is provided a pump body according to the embodiment of the first aspect.

The compressor according to the embodiment of the present invention has all the advantages of the pump body according to the embodiment of the first aspect, and will not be described herein.

A refrigeration appliance according to an embodiment of the third aspect of the present invention includes a compressor of an embodiment of the second aspect.

The refrigeration apparatus according to the embodiment of the present invention has all the advantages of the compressor of the embodiment of the second aspect, and will not be described herein.

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

The invention is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a side view of a pump body according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of a portion of the portion A shown in FIG. 1;

FIG. 3 is a schematic view of the pump body with the housing and the second bearing hidden;

FIG. 4 is a schematic view of a pump body with a hidden housing and a second bearing according to another embodiment of the present invention;

FIG. 5 is a side view of a second cylinder of the pump body according to an embodiment of the present invention;

fig. 6 is a side view of a second cylinder of a pump body according to another embodiment of the present invention.

Reference numerals:

a housing 100;

a first bearing 200 and a second oil return groove 210;

a first cylinder 300 and a first sub oil return groove 310;

a middle plate 400;

a second cylinder 500, a second sub oil return groove 510, a mounting groove 520, an air suction hole 530, and a spring mounting hole 540;

a second bearing 600;

magnetic member 700.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description and simplification of the description, and does not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed 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 explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In the related technology, the compressor is a common refrigeration source of refrigeration equipment, the compressor comprises a motor, a pump body and other parts, refrigerating oil for refrigerating and lubricating the motor and the pump body is arranged in the compressor, and when the refrigerating oil flows back, the refrigerating oil flows from one side of the pump body to the other side of the pump body and then flows back to an oil tank, so that the refrigerating oil can be recycled. The motor, the pump body and the like are provided with rotating parts, most of the parts are metal products, mechanical friction is generated among the parts, the parts drop tiny metal scraps and other foreign matters, friction between the foreign matters and the parts is increased in the circulation process of the refrigerating oil, abrasion of the parts is further accelerated, and the service lives of the parts and the compressor are shortened.

In order to solve the above problems, a pump body, a compressor, and a refrigeration apparatus according to an embodiment of the present invention will be described below with reference to fig. 1 to 4.

The first aspect of the present invention provides a pump body, which includes a housing 100, a first bearing 200, a cylinder assembly, a second bearing 600, and a magnetic member 700, wherein the first bearing 200, the cylinder assembly, and the second bearing 600 are sequentially disposed in the housing 100, and an oil return channel is formed between the first bearing 200, the cylinder assembly, the second bearing 600, and the housing 100; at least a portion of the magnetic member 700 is located within the oil return passage.

The compressor is provided with circulating refrigerating oil, which flows from one side of the first bearing 200 to one side of the second bearing 600 in the housing 100 at the time of return, and then flows back to the oil sump, so that the refrigerating oil is circulated for use, i.e., the refrigerating oil flows back to the oil sump through the return passage. The mechanical friction of the pump body and other parts of the compressor generates tiny metal scraps and other foreign matters, the foreign matters can be taken away by the refrigerating oil, the refrigerating oil carries the foreign matters to pass through the oil return channel, the magnetic part 700 has adsorption force, the magnetic part 700 moves towards the magnetic part 700 or the foreign matters passing by the magnetic part 700 are adsorbed, and then the foreign matters in the refrigerating oil are removed. Foreign matters in the returned frozen oil are removed, so that clean frozen oil is obtained, the abrasion of parts can be reduced by the clean frozen oil, the service life of each part is prolonged, and the reliability of the pump body and the compressor is improved.

The cylinder assembly is provided with a first oil return groove, the first bearing 200 is provided with a second oil return groove 210, the second bearing 600 is provided with a third oil return groove (not shown in the figure), and the second oil return groove 210, the first oil return groove and the second oil return groove 210 are sequentially communicated to form part of the oil return channel.

The cylinder assembly includes a first cylinder 300, a middle plate 400, and a second cylinder 500, and the first cylinder 300 and the second cylinder 500 are connected together through the middle plate 400. The first cylinder 300 is provided with a first sub-oil-return groove 310, and the second cylinder 500 is provided with a second sub-oil-return groove 510, and the first sub-oil-return groove 310 and the second sub-oil-return groove 510 communicate with each other and form the above-mentioned first oil-return groove. The first bearing 200, the first cylinder 300, the intermediate plate 400, the second cylinder 500, and the second bearing 600 are sequentially disposed in the housing 100. It will be appreciated that the groove wall of the second oil return groove 210, the groove wall of the first sub oil return groove 310, the groove wall of the second sub oil return groove 510, the groove wall of the third oil return groove and the inner wall of the housing 100 enclose an oil return channel having an inlet and an outlet, and at least part of the structure of the magnetic member 700 is located in the oil return channel.

It can be understood that the pump body includes a housing 100, a first bearing 200, a first cylinder 300, an intermediate plate 400, a second cylinder 500, a second bearing 600, and a magnetic member 700, wherein the first bearing 200, the first cylinder 300, the intermediate plate 400, the second cylinder 500, and the second bearing 600 are sequentially disposed in the housing 100 to form a double cylinder pump body structure, thereby completing the compression operation of the refrigerant. Specifically, among the several components of the first bearing 200, the first cylinder 300, the intermediate plate 400, the second cylinder 500 and the second bearing 600, two adjacent components are detachably connected to each other, so that the pump body is convenient to assemble and maintain.

It should be noted that, the partial structure of the magnetic member 700 is located in the oil return channel, the magnetic member 700 does not block the oil return channel, so that the frozen oil can pass through the oil return channel, and meanwhile, the magnetic member 700 is convenient for contacting with the foreign matters in the frozen oil, so that the magnetic member 700 can be adsorbed to the foreign matters passing through the oil return channel.

It will be appreciated that the inner wall of the housing 100 is provided with a groove, which extends along the length direction of the housing 100, and the first bearing 200, the cylinder assembly, the second bearing 600 and the housing 100 can still form an oil return channel therebetween, and the groove is a part of the inner cavity of the oil return channel.

It can be understood that the partial structure of the magnetic member 700 is located on the geometric center line of the oil return channel, that is, the partial structure of the magnetic member 700 extends to the center area of the oil return channel, so that the magnetic member can be fully contacted with the frozen oil, the effect of adsorbing the foreign matters by the magnetic member 700 is improved, and the occurrence of blocking of the oil channel is avoided.

The second oil return groove 210, the first sub oil return groove 310, the second sub oil return groove 510 and the third oil return groove are positioned on the same straight line, and the cross sections of the second oil return groove 210, the first sub oil return groove 310, the second sub oil return groove 510 and the third oil return groove are similar in size and shape, namely the oil return passage is in a straight line shape. Since the oil return passage is linear, whether the magnetic part 700 is neglected to be mounted in the oil return passage can be observed through the third oil return groove and the second sub oil return groove 510, and whether the magnetic part 700 is neglected to be mounted in the oil return passage can be observed through the second oil return groove 210, the first sub oil return groove 310 and the second sub oil return groove 510. The second oil return groove 210 and the casing 100 form an inlet of an oil return channel, the third oil return groove and the casing 100 form an outlet of the oil return channel, that is, the inlet and the outlet of the oil return channel both play a role of an observation hole, and the interior of the oil return channel is observed through the inlet and the outlet of the oil return channel, so that whether the magnetic part 700 is leaked from the interior of the oil return channel is confirmed.

It can be appreciated that the structure of a part of the magnetic member 700 is disposed in the second sub oil return groove 510; the structure of a part of the magnetic member 700 may also be located in the first sub oil return groove 310; the structure of part of the magnetic part 700 can also be located in the second sub oil return groove 510 and the first sub oil return groove 310 at the same time, that is, the magnetic part 700 has two sub magnetic parts, the two sub magnetic parts are located in the second sub oil return groove 510 and the first sub oil return groove 310 respectively, and the above three magnetic parts 700 are arranged in such a way that the magnetic part 700 can exert the function of adsorbing foreign matters.

Referring to fig. 2, a part of the magnetic member 700 extends into the second sub oil return groove 510, the second sub oil return groove 510 is close to the rear end or the oil discharge end or the outlet of the oil return channel, the flow rate of the frozen oil is reduced when the frozen oil reaches the oil discharge end of the oil return channel, the moving speed of the foreign matters relative to the magnetic member 700 is reduced under the action of gravity and the influence of the flow rate of the frozen oil, and the foreign matters with smaller moving speed are more easily adsorbed by the magnetic member 700, so that the adsorption effect of the magnetic member 700 is improved.

It is understood that the cross-sections of the first bearing 200, the first cylinder 300, the second cylinder 500, the second bearing 600, and the housing 100 are all circular. That is, the second oil return groove 210 is disposed on the outer circumferential surface of the first bearing 200, and the direction of the second oil return groove 210 is the same as the axial direction of the first bearing 200; the first sub oil return groove 310 is arranged on the outer circumferential surface of the first cylinder 300, and the trend of the first sub oil return groove 310 is the same as the axial direction of the first cylinder 300; the second sub oil return groove 510 is arranged on the outer circle surface of the second cylinder 500, and the trend of the second sub oil return groove 510 is the same as the axial direction of the second cylinder 500; the third oil return groove is provided on the outer circumferential surface of the second bearing 600, and the direction of the third oil return groove is the same as the axial direction of the second bearing 600. The grooves are formed on the outer circumferential surface of the first bearing 200, the outer circumferential surface of the first cylinder 300, the outer circumferential surface of the second cylinder 500, and the outer circumferential surface of the second bearing 600, and thus have the advantage of rapid and convenient processing. When the pump body is installed, the oil return passage is formed by fixedly connecting the first bearing 200, the first cylinder 300, the second cylinder 500, and the second cylinder 600 with the housing 100 in the order of positions.

It will be appreciated that the groove wall of the second sub oil return groove 510 or the outer circumferential surface of the second cylinder 500 is provided with a mounting groove 520 for mounting the magnetic member 700, and in particular, the magnetic member 700 is coupled with the groove wall of the mounting groove 520 such that the magnetic member 700 is positioned in the mounting groove 520. The installation groove 520 plays a role in installing and limiting the magnetic member 700, so that the installation groove 520 is convenient for positioning and installing the magnetic member 700, and the magnetic member 700 can be prevented from moving in the oil return channel to deviate from the installation area of the magnetic member 700. Because the magnetic part 700 has the adsorption force, the magnetic part 700 is attached to the second air cylinder 500 or the wall of the mounting groove 520 under the action of the own adsorption force, and when the magnetic part 700 is mounted, other connecting means are not required to be adopted to connect the magnetic part 700 with the second air cylinder 500, so that the mounting of the magnetic part 700 has the advantage of rapidness and convenience. Because other connecting means are not needed to connect the magnetic member 700 and the second air cylinder 500 together, holes are not needed to be formed on the second air cylinder 500 and the magnetic member 700, and the structures of the second air cylinder 500 and the magnetic member 700 are simpler.

It will be appreciated that referring to fig. 2, the magnetic member 700 may be square, which is a common shape, and the square magnetic member 700 is easy to process and install. The mounting groove 520 is formed between the outer circumferential surface and the end surface of the second cylinder 500, the mounting groove 520 is communicated with the second sub oil return groove 510, the position of the mounting groove 520 is selected to facilitate the processing of the mounting groove 520, but the position of the mounting groove 520 on the second cylinder 500 is not limited to this.

Referring to fig. 5, the shape of the space in the mounting groove 520 matches the shape of the magnetic member 700. It should be understood that the mounting groove 520 and the magnetic member 700 are both square, that is, the length and width of the mounting groove 520 are L1 and W1, respectively, and the length and width of the magnetic member 700 are L2 and W2, respectively, so that the conditions are satisfied: the difference of L1 minus L2 is greater than or equal to 0.5mm and less than or equal to 1mm, the difference of W1 minus W2 is also greater than or equal to 0.5mm and less than or equal to 1mm, the length and width of the mounting groove 520 are ensured to be greater than the length and width of the magnetic piece 700, interference between the magnetic piece 700 and the groove wall of the mounting groove 520 can be avoided, and the magnetic piece 700 can be conveniently and completely mounted into the mounting groove 520.

The distance between the magnetic member 700 and the outer circumferential surface of the second cylinder 500 is S, that is, the minimum distance between the magnetic member 700 and the outer circumferential surface of the second cylinder 500 satisfies: s is more than or equal to 0.3mm and less than or equal to 0.6mm, so that the magnetic piece 700 can be completely immersed into the mounting groove 520, the magnetic piece 700 is prevented from protruding out of the second cylinder 500, and the magnetic piece 700 is prevented from abutting the shell 100 or interfering with the shell 100.

It will also be appreciated that, referring to fig. 6, the magnetic member 700 may also have a cylindrical shape, the shape of the space in the installation groove 520 is the same as that of the magnetic member 700, and the cylindrical shape is also a common shape, so that the cylindrical magnetic member 700 is convenient to process and install. The cross section of the mounting groove 520 and the cross section of the magnetic member 700 are both circular, the diameter of the cross section of the mounting groove 520 is D1, and the diameter of the cross section of the magnetic member 700 is D2, satisfying the condition: D1-D2 is less than or equal to 0.5mm and less than or equal to 1mm. The diameter of the mounting groove 520 is larger than that of the magnetic member 700, and the magnetic member 700 can be easily moved into or out of the mounting groove 520. The mounting groove 520 is formed in a region between the outer circumferential surface and the end surface of the second cylinder 500, the mounting groove 520 is communicated with the second sub oil return groove 510, and the position of the mounting groove 520 is selected to facilitate the processing of the mounting groove 520, but the position of the mounting groove 520 is not limited thereto.

The gap between the magnetic member 700 and the adjacent member is 2mm or more, so that interference between the magnetic member 700 and the adjacent member is avoided, that is, the gap between the magnetic member 700 and the first cylinder 300, the intermediate plate 400, and the second bearing 600 is 2mm or more. The presence of the gap between the magnetic element 700 and the adjacent components facilitates the installation of the magnetic element 700 and the installation of the entire pump body.

It should be noted that, the magnetic member 700 adopts a permanent magnet, the permanent magnet has an adsorption force, and the adsorption force of the permanent magnet cannot disappear, so that the magnetic member 700 is always kept in a state of adsorbing the foreign matters, and the foreign matters in the frozen oil are removed more cleanly. The magnetic member 700 may also be an electromagnet. The electromagnet has adsorption force under the condition of electrifying, and the electromagnet can also adsorb the foreign matter, and when the electromagnet is not electrified, the foreign matter will be carried to the oil sump by the frozen oil, can get rid of the foreign matter in the oil sump for the foreign matter content of frozen oil in the pump body obtains reducing, avoids leading to the condition that the oil return passageway is blocked because the foreign matter content is too much, guarantees the unobstructed of oil return passageway.

It should be noted that, the middle plate 400 is provided with an avoidance hole or an avoidance groove, two ends of the avoidance hole and/or the avoidance groove are respectively communicated with the second sub oil return groove 510 and the first sub oil return groove 310, and the peripheral wall of the oil return channel presents a sealing state.

The first bearing 200 and the second bearing 600 have the same or similar structures, the rotating parts of the bearings are rotatably provided on the fixed parts of the bearings, both the fixed parts of the first bearing 200 and the second bearing 600 are connected with the housing 100, both the rotating parts of the first bearing 200 and the second bearing 600 are connected with the transmission mechanism, and the transmission mechanism drives the driving part of the second cylinder 500 and the driving part of the first cylinder 300 to rotate.

It will be appreciated that the housing 100 is connected to the second cylinder 500 by a spring. The outer circumferential surface of the second cylinder 500 is provided with a suction hole 530 and a spring mounting hole 540, the spring is penetrated through the spring mounting hole 540, and the case 100 is provided with a through hole at a region corresponding to the suction hole 530. The internal structure of the second cylinder 500 is the same as that of a general compressor cylinder, and redundant description is not made herein. The structure of the first cylinder 300 is the same as that of the second cylinder 500.

In the present invention, the cylinder assembly includes only the second cylinder 500, that is, the middle plate 400 and the first cylinder 300 are omitted from the above embodiment to form a single cylinder pump body structure. The structures of the second cylinder 500, the first bearing 200 and the second bearing 600 are unchanged, the first bearing 200 is detachably connected with the second cylinder 500, the second cylinder 500 is detachably connected with the second bearing 600, the second sub oil return groove 510 on the second cylinder 500 is a first oil return groove, the groove wall of the second oil return groove 210, the groove wall of the first oil return groove, the groove wall of the third oil return groove and the inner wall of the shell 100 can also be encircled to form an oil return channel with an inlet and an outlet, the magnetic part 700 is connected with the second cylinder 500, the oil return channel accommodates part of the structure of the magnetic part 700, and the magnetic part 700 can still adsorb foreign matters passing through the oil return channel.

The groove wall of the second sub oil return groove 510 is still provided with a mounting groove 520 for mounting the magnetic member 700, and the mounting groove 520 still plays a role in limiting and mounting the fixed magnetic member 700. The length-width dimension relationship of the mounting groove 520 and the length-width dimension relationship of the magnetic member 700 and the distance dimension relationship of the magnetic member 700 and the outer circumferential surface of the second cylinder 500 are the same as those of the above-described embodiments, ensuring smooth mounting and operation of the magnetic member 700. The structure of part of the magnetic member 700 extends to the geometric center line of the oil return passage so that the suction effect of the magnetic member 700 is ensured. The magnetic member 700 may be a permanent magnet or an electromagnet.

An embodiment of a second aspect of the invention provides a compressor comprising the pump body of the embodiment of the first aspect.

The compressor of the second aspect embodiment may be a horizontal rotary compressor, the rotary compressor is a fully-enclosed refrigeration compressor commonly used in household refrigeration equipment, the pump body is mounted inside the compressor shell through the mounting frame, and the compressor further comprises a motor, a transmission mechanism, an air suction and exhaust system, the pump body of the first aspect embodiment and the like. The transmission mechanism comprises a crankshaft, the crankshaft penetrates through the first bearing 200, the first cylinder 300, the second cylinder 500 and the second bearing 600, oil suction channels are arranged in the crankshaft, the oil suction channels are distributed along the length direction of the crankshaft, and an inlet and an outlet of the oil suction channels are positioned on two ends of the crankshaft.

An embodiment of a third aspect of the present invention provides a refrigeration appliance including the compressor of the embodiment of the second aspect.

It will be appreciated that the refrigeration appliance of the embodiment of the third aspect may be a refrigerator, an air conditioner or the like, and is not limited herein.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

Of course, the present invention is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope of the present invention as defined in the claims.

Claims (8)

1. The pump body, its characterized in that includes:

the oil return device comprises a shell, wherein a first bearing, a cylinder assembly and a second bearing are sequentially arranged in the shell, an oil return channel is formed between the first bearing, the cylinder assembly and the second bearing, a second oil return groove is formed in the first bearing, a third oil return groove is formed in the second bearing, the walls of the second oil return groove, the walls of the first oil return groove, the walls of the third oil return groove and the inner wall of the shell are surrounded to form the oil return channel, the cylinder assembly comprises a first cylinder and a second cylinder, the first bearing, the first cylinder, the second cylinder and the second bearing are sequentially arranged in the shell, and a first sub oil return groove and a second sub oil return groove are respectively formed in the first cylinder and the second cylinder and are communicated with each other to form the first oil return groove;

the magnetic piece is positioned in the first sub oil return groove and/or the second sub oil return groove.

2. The pump body according to claim 1, wherein the wall of the second sub-oil return groove is provided with a mounting groove, and the magnetic member is disposed in the mounting groove.

3. The pump body of claim 2, wherein the mounting groove and the magnetic member are both square structures, the mounting groove has a length and a width of L1 and W1, respectively, and the magnetic member has a length and a width of L2 and W2, respectively, so as to satisfy the following conditions: L1-L2 is less than or equal to 0.5mm and less than or equal to 1mm, W1-W2 is less than or equal to 0.5mm and less than or equal to 1mm.

4. A pump body according to claim 2 or 3, wherein the magnetic member is spaced from the outer circumferential surface of the second cylinder by a distance S that satisfies: s is more than or equal to 0.3mm and less than or equal to 0.6mm.

5. The pump body of claim 1, wherein a portion of the magnetic member is located on a centerline of the oil return passage.

6. Pump body according to claim 1, characterized in that the magnetic element is a permanent magnet or an electromagnet.

7. Compressor, characterized by comprising a pump body according to any one of claims 1 to 6.

8. A refrigeration apparatus comprising the compressor of claim 7.

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