阅读说明：本技术 泵体组件和具有其的旋转压缩机 (Pump body assembly and rotary compressor with same ) 是由 林少坤 吴延平 于 2018-08-06 设计创作，主要内容包括：本发明公开了一种泵体组件和具有其的旋转压缩机,泵体组件包括：曲轴,曲轴设有第一偏心部和第二偏心部；气缸,气缸内限定出第一腔室,气缸上设有滑片槽；第一活塞,第一活塞外套在第一偏心部上且可转动地设在第一腔室内；滑片,滑片可往复移动地设在滑片槽内；轴承,轴承外套在曲轴上且轴承内设有第二偏心部的活动空间,轴承上设有第二腔室,第二腔室的侧壁上设有与活动空间连通的连接孔；第二活塞,第二活塞可往复移动地设在第二腔室内,第二活塞的活塞杆穿过连接孔以止抵在第二偏心部上以由第二偏心部驱动往复移动。本发明的泵体组件,可实现多级压缩或多缸压缩,泵体组件对冷媒的压缩能力强,工作效率高。(The invention discloses a pump body assembly and a rotary compressor with the same, wherein the pump body assembly comprises: the crankshaft is provided with a first eccentric part and a second eccentric part; the air cylinder is internally provided with a first cavity and is provided with a slide sheet groove; the first piston is sleeved on the first eccentric part and can be rotatably arranged in the first cavity; the sliding sheet is arranged in the sliding sheet groove in a reciprocating manner; the bearing is sleeved on the crankshaft, a movable space of the second eccentric part is arranged in the bearing, a second cavity is arranged on the bearing, and a connecting hole communicated with the movable space is formed in the side wall of the second cavity; and the piston rod of the second piston passes through the connecting hole to be stopped on the second eccentric part so as to be driven by the second eccentric part to reciprocate. The pump body assembly can realize multi-stage compression or multi-cylinder compression, and has strong compression capacity on refrigerants and high working efficiency.)

1. A pump body assembly for a rotary compressor, comprising:

a crankshaft provided with a first eccentric portion and a second eccentric portion;

the air cylinder is internally provided with a first cavity and is provided with a sliding sheet groove;

the first piston is sleeved on the first eccentric part and is rotatably arranged in the first cavity;

the sliding piece is arranged in the sliding piece groove in a reciprocating manner, and the front end of the sliding piece is stopped against the outer peripheral wall of the first piston;

the bearing is positioned on one side of the cylinder, the bearing is sleeved on the crankshaft, a movable space of the second eccentric part is arranged in the bearing, a second cavity is arranged on the bearing, an auxiliary exhaust port and an auxiliary suction port are arranged in the second cavity, and a connecting hole communicated with the movable space is formed in the side wall of the second cavity;

and the second piston is arranged in the second chamber in a reciprocating manner, a piston rod of the second piston penetrates through the connecting hole to be stopped on the second eccentric part so as to be driven by the second eccentric part to move in a reciprocating manner, and the second piston moves in a reciprocating manner so that the volume of the second chamber is changed and the auxiliary exhaust port and the auxiliary suction port are switched to be opened.

2. The pump body assembly for a rotary compressor according to claim 1, wherein the first eccentric portion and the second eccentric portion are spaced apart in an axial direction of the crankshaft.

3. The pump body assembly for a rotary compressor according to claim 1, wherein the piston rod is clearance-fitted with the coupling hole.

4. The pump body assembly for a rotary compressor according to claim 3, wherein an oil groove is provided on a peripheral wall of the second piston which engages with an inner wall of the second chamber, and oil holes which communicate with the connecting hole and the oil groove, respectively, are provided on the second piston.

5. The pump body assembly for a rotary compressor according to claim 4, wherein the oil groove is formed in a closed ring shape.

6. The pump block assembly for a rotary compressor according to claim 1, wherein the portion of the second piston in sliding engagement with the inner wall of the second chamber is provided with a lightening groove.

7. The pump block assembly for a rotary compressor according to claim 6, wherein said lightening slots are provided on a side wall of said second piston facing the center of said bearing.

8. The pump body assembly for a rotary compressor according to claim 7, wherein said lightening slots are formed as annular grooves extending around said piston rod.

9. The pump body assembly for a rotary compressor according to claim 1, wherein the outer peripheral wall of the bearing is provided with a cutout communicating with the second chamber, the cutout being provided with a valve plate assembly on which the auxiliary discharge port and the auxiliary suction port are respectively provided.

10. The pump body assembly for a rotary compressor according to any one of claims 1 to 9, wherein a plurality of the second chambers are provided in the bearing at intervals in a circumferential direction, and each of the second chambers is provided with the second piston, the secondary discharge port and the secondary suction port.

11. A rotary compressor, comprising:

a pump body assembly for a rotary compressor according to any one of claims 1 to 10;

and the crankshaft is connected with the motor component so as to be driven by the motor component to rotate.

Technical Field

The invention relates to the field of compressors, in particular to a pump body assembly and a rotary compressor with the same.

Background

In the related art, the application of the rotary compressor is more and more common, and related technical personnel have higher and higher requirements on a pump body assembly applied to the rotary compressor, but most of the pump body assemblies have single compression types, and the compression capacity of the pump body assembly on refrigerants and the working efficiency of the pump body assembly need to be improved.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a pump assembly for a rotary compressor, which can achieve multi-stage compression or multi-cylinder compression, and has high compression capacity and high working efficiency for refrigerants.

The invention also provides a rotary compressor which comprises the pump body assembly.

A pump body assembly for a rotary compressor according to an embodiment of the present invention includes: a crankshaft provided with a first eccentric portion and a second eccentric portion; the air cylinder is internally provided with a first cavity and is provided with a sliding sheet groove; the first piston is sleeved on the first eccentric part and is rotatably arranged in the first cavity; the sliding piece is arranged in the sliding piece groove in a reciprocating manner, and the front end of the sliding piece is stopped against the outer peripheral wall of the first piston; the bearing is positioned on one side of the cylinder, the bearing is sleeved on the crankshaft, a movable space of the second eccentric part is arranged in the bearing, a second cavity is arranged on the bearing, an auxiliary exhaust port and an auxiliary suction port are arranged in the second cavity, and a connecting hole communicated with the movable space is formed in the side wall of the second cavity; and the second piston is arranged in the second chamber in a reciprocating manner, a piston rod of the second piston penetrates through the connecting hole to be stopped on the second eccentric part so as to be driven by the second eccentric part to move in a reciprocating manner, and the second piston moves in a reciprocating manner so that the volume of the second chamber is changed and the auxiliary exhaust port and the auxiliary suction port are switched to be opened.

According to the pump body assembly for the rotary compressor, the bearing is provided with the second cavity, the second piston is arranged in the second cavity, and the second piston penetrates through the connecting hole to be abutted to the second eccentric portion to be driven by the first piston to reciprocate, so that the pump body assembly can realize multi-stage compression or multi-cylinder compression, application of various compression types is realized, the compression capacity of the pump body assembly on a refrigerant can be improved to a certain degree, the application range of the pump body assembly is expanded, the use flexibility of the pump body assembly is improved, and further the working efficiency of the pump body assembly can be improved.

According to some embodiments of the invention, the first eccentric portion and the second eccentric portion are spaced apart in an axial direction of the crankshaft.

According to some embodiments of the invention, the piston rod is clearance fitted with the connection hole.

In some embodiments of the present invention, an oil groove is formed in a peripheral wall of the second piston, which is engaged with an inner wall of the second chamber, and oil holes respectively communicating with the connecting hole and the oil groove are formed in the second piston.

Specifically, the oil groove is formed in a closed ring shape.

According to some embodiments of the invention, a portion of the second piston in sliding engagement with an inner wall of the second chamber is provided with a weight-reducing groove.

In some embodiments of the invention, the weight-reduction groove is provided on a side wall of the second piston facing a center of the bearing.

Further, the weight-reduction groove is formed as an annular groove extending around the piston rod.

According to some embodiments of the invention, the outer peripheral wall of the bearing is provided with a cutout communicating with the second chamber, the cutout is provided with a valve plate assembly, and the secondary exhaust port and the secondary suction port are respectively provided on the valve plate assembly.

According to some embodiments of the present invention, the bearing is provided with a plurality of second chambers distributed at intervals along the circumferential direction, and each of the second chambers is provided with the second piston, the secondary exhaust port, and the secondary suction port.

A rotary compressor according to an embodiment of the present invention includes: a pump body assembly for a rotary compressor according to the above embodiment of the present invention; and the crankshaft is connected with the motor component so as to be driven by the motor component to rotate.

According to the rotary compressor provided by the embodiment of the invention, by arranging the pump body assembly provided by the embodiment of the invention, multi-stage compression or multi-cylinder compression can be realized, application of various compression types can be realized, the compression capacity of the rotary compressor to refrigerants can be improved to a certain extent, the application range of the rotary compressor is expanded, the use flexibility of the rotary compressor is improved, and further the working efficiency of the rotary compressor can be 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

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of a rotary compressor according to an embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic view of a pump body assembly according to an embodiment of the present invention.

Reference numerals:

a pump body assembly 100;

a crankshaft 1; a first eccentric portion 11; a second eccentric portion 12;

a cylinder 2; a first chamber 21; a main air inlet 21 a;

a first piston 3;

a bearing 5; a main bearing 5 a; a sub-bearing 5 b; an activity space 51; a second chamber 52; the connection hole 53; a cut-out 54;

a second piston 6; a piston rod 61; an oil sump 62; oil holes 63; the lightening slots 64;

a valve plate assembly 7; a suction/exhaust valve plate 71; the air suction and exhaust cavity plate 72; a cavity 72 a;

a rotary compressor 200;

a housing 201;

a motor assembly 301; a stator 311; a rotor 312;

a reservoir 401; an outlet 401 a; an inlet 401 b.

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 is to be understood that the terms "center", "length", "thickness", "upper", "lower", "inner", "outer", "axial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A pump body assembly 100 for a rotary compressor 200 according to an embodiment of the present invention will be described with reference to fig. 1 to 3.

As shown in fig. 1 to 3, a pump body assembly 100 for a rotary compressor 200 according to an embodiment of the present invention includes: crankshaft 1, cylinder 2, first piston 3, sliding vane, bearing 5 and second piston 6.

Specifically, the crankshaft 1 is provided with a first eccentric portion 11 and a second eccentric portion 12. A first cavity 21 is defined in the cylinder 2, and a slide sheet groove is formed in the cylinder 2. The first piston 3 is fitted over the first eccentric portion 11 and is rotatably disposed in the first chamber 21. That is, the first piston 3 is driven to rotate by the first eccentric portion 11.

The slide is reciprocatingly movably disposed in the slide groove, and the tip of the slide abuts against the outer peripheral wall of the first piston 3. So that the first piston 3 and the sliding vane cooperate to divide the first chamber 21 into a suction chamber and a discharge chamber. It will be appreciated that the volumes of the suction and discharge chambers are constantly changing as the first piston 3 is driven in rotation within the first chamber 21 by the first eccentric portion 11.

Specifically, the first chamber 21 is provided with a main suction port 21a and a main exhaust port (not shown), wherein the suction chamber has the main suction port 21a and the exhaust chamber has the main exhaust port. Therefore, after refrigerant gas enters the suction cavity through the main suction port 21a, the refrigerant gas in the suction cavity gradually enters the exhaust cavity along with the rotation of the first piston 3 in the first cavity 21, and under the rotation action of the first piston 3, the volume of the exhaust cavity gradually changes to realize the gradual compression action on the refrigerant, so that the compression of the pump body assembly 100 on the refrigerant is realized, the compressed high-pressure refrigerant can be discharged out of the first cavity 21 through the main exhaust port, and the normal work of the pump body assembly 100 can be ensured.

The bearing 5 is located at one side of the cylinder 2, the bearing 5 is sleeved on the crankshaft 1, a movable space 51 of the second eccentric part 12 is arranged in the bearing 5, a second chamber 52 is arranged on the bearing 5, an auxiliary exhaust port (not shown) and an auxiliary suction port (not shown) are arranged in the second chamber 52, and a connecting hole 53 communicated with the movable space 51 is arranged on the side wall of the second chamber 52. It can be seen that the second eccentric portion 12 can rotate in the movable space 51.

It will be appreciated that the bearing 5 may be a main bearing 5a located on the upper side of the cylinder 2 and/or a secondary bearing 5b located on the lower side of the cylinder 2. That is, the second chamber 52 may be provided on the main bearing 5a and/or on the secondary bearing 5 b.

The second piston 6 is reciprocally disposed in the second chamber 52, a piston rod 61 of the second piston 6 passes through the connecting hole 53 to be stopped against the second eccentric portion 12 to be driven to reciprocate by the second eccentric portion 12, and the second piston 6 reciprocally moves to change the volume of the second chamber 52 and to open the sub exhaust port and the sub intake port alternately. As a result, the second piston 6 is driven to rotate by the second eccentric portion 12. That is to say that both the first piston 3 and the second piston 6 are driven in rotation by the crankshaft 1.

Therefore, when the second piston 6 moves toward the movable space 51 by the driving of the second eccentric portion 12, the volume of the second chamber 52 is increased, so that the pressure in the second chamber 52 is lower than the pressure outside the second chamber 52, and the sub suction port is opened by the pressure difference, thereby performing the refrigerant suction process of the pump assembly 100. The refrigerant enters the second chamber 52 through the auxiliary suction port, the volume of the second chamber 52 gradually changes under the reciprocating action of the second piston 6, so that the refrigerant in the second chamber 52 can be gradually compressed, the compression of the pump body assembly 100 on the refrigerant is further realized, when the refrigerant in the second chamber 52 is compressed, so that the pressure in the second chamber 52 is greater than the pressure outside the second chamber 52, the auxiliary exhaust port is opened under the action of pressure difference, and the high-pressure refrigerant can be exhausted out of the second chamber 52. Therefore, the reliability of switching and opening the auxiliary exhaust port and the auxiliary suction port can be ensured, and the normal operation of the pump body assembly 100 can be further ensured.

As can be seen from this, in the pump unit 100 according to the embodiment of the present invention, when the main exhaust port is connected to the auxiliary suction port, or the auxiliary exhaust port is connected to the main suction port 21a, the two-stage compression of the refrigerant by the pump unit 100 can be realized. When the suction and exhaust of the first chamber 21 and the second chamber 52 are independent, the pump assembly 100 can independently compress the refrigerant in two cylinders. Therefore, the pump body assembly 100 can realize multi-stage compression or multi-cylinder compression, the compression capacity of the pump body assembly 100 on refrigerants can be improved to a certain degree, the application of various compression types is realized, the application range of the pump body assembly 100 is expanded, the flexibility of the use of the pump body assembly 100 is improved, and the working efficiency of the pump body assembly 100 can be improved. Here, "multistage" means two or more stages, and "multi-cylinder" means two or more cylinders.

It can be understood that the rotary compressor 200 further includes the motor assembly 301, and the pump body assembly 100 according to the embodiment of the present invention may be connected to the motor assembly 301 through the crankshaft 1, so that the crankshaft 1 is driven by the motor assembly 301 to rotate, so that the rotary compressor 200 to which the pump body assembly 100 according to the embodiment of the present invention is applied may provide a power source through only one motor, thereby reducing the number of components of the rotary compressor 200 to a certain extent, reducing the volume and weight of the rotary compressor 200, making the structure of the rotary compressor 200 compact, facilitating the miniaturization and light weight of the rotary compressor 200, and also reducing the manufacturing cost of the rotary compressor 200 to a certain extent.

Meanwhile, if it is required to ensure that the piston rod 61 of the second piston 6 normally abuts against the second eccentric portion 12 to be driven by the second eccentric portion 12 to reciprocate, the pressure generated by the refrigerant in the second chamber 52 on the second piston 6 is ensured to be greater than the pressure generated by the gas in the movable space 51 on the second piston 6, so that the piston rod 61 of the second piston 6 can normally abut against the second eccentric portion 12 to be driven by the second eccentric portion 12 to reciprocate under the action of the pressure difference.

For example, when the rotary compressor 200 is a low back pressure compressor, the pressure of the refrigerant in the second chamber 52 is greater than the pressure of the gas in the movable space 51, so that the piston rod 61 of the second piston 6 can be always stopped against the second eccentric portion 12 to be driven by the second eccentric portion 12 to reciprocate. When the rotary compressor 200 is a high back pressure compressor, the pressure of the refrigerant in the second chamber 52 is lower than the pressure of the gas in the movable space 51, and at this time, the pressure receiving areas of the two ends (the end abutting against the second eccentric portion 12 and the end contacting with the refrigerant in the second chamber 52) of the second piston 6 are controlled to be different, that is, the pressure receiving area of the end abutting against the second eccentric portion 12 of the second piston 6 is controlled to be smaller than the pressure receiving area of the end of the second piston 6 contacting with the refrigerant in the second chamber 52, and the product of the pressure receiving area of the end abutting against the second eccentric portion 12 of the second piston 6 and the pressure received at this point is also controlled to be smaller than the product of the pressure receiving area of the end of the second piston 6 contacting with the refrigerant in the second chamber 52 and the pressure received at this point. Therefore, the pressure of the refrigerant in the second chamber 52 on the second piston 6 is greater than the pressure of the gas in the movable space 51 on the second piston 6, so that the piston rod 61 of the second piston 6 can be always kept against the second eccentric portion 12 to be driven by the second eccentric portion 12 to reciprocate.

According to the pump body assembly 100 for the rotary compressor 200 of the embodiment of the invention, the second cavity 52 is arranged on the bearing 5, the second piston 6 is arranged in the second cavity 52, and the second piston 6 passes through the connecting hole 53 to be stopped on the second eccentric part 12 to be driven by the first piston 3 to reciprocate, so that the pump body assembly 100 can realize multi-stage compression or multi-cylinder compression, and realize application of multiple compression types, the compression capacity of the pump body assembly 100 on refrigerants can be improved to a certain extent, the application range of the pump body assembly 100 is expanded, the flexibility of the use of the pump body assembly 100 is improved, and further the working efficiency of the pump body assembly 100 can be improved.

According to some embodiments of the invention, the first eccentric portion 11 and the second eccentric portion 12 are spaced apart in the axial direction of the crankshaft 1. Therefore, the first eccentric part 11 and the second eccentric part 12 can respectively drive the first piston 3 to rotate and the second piston 6 to reciprocate, and the reliability of the pump body assembly 100 can be improved.

According to some embodiments of the present invention, the piston rod 61 is clearance fitted with the coupling hole 53. Therefore, the reliability and flexibility of the reciprocating movement of the second piston 6 in the connecting hole 53 can be ensured, the reliability of the pump body assembly 100 for compressing the refrigerant is further ensured, and the working reliability of the pump body assembly 100 is improved.

Specifically, the clearance between the piston rod 61 and the connecting hole 53 is 0.02-0.04 mm. So that not only the reliability and flexibility of the reciprocating movement of the second piston 6 in the connecting hole 53 can be ensured. When the pressure in the movable space 51 is higher than the pressure in the second chamber 52, the gap between the piston rod 61 and the connecting hole 53 is set to a certain size, so that the gas in the movable space 51 can be prevented from entering the second chamber 52 through the gap, and the reliability of the pump body assembly 100 in compressing the refrigerant is improved.

In some embodiments of the present invention, an oil groove 62 is formed on a peripheral wall of the second piston 6 engaged with an inner wall of the second chamber 52, and oil holes 63 communicating with the connecting hole 53 and the oil groove 62, respectively, are formed on the second piston 6. Therefore, lubricating oil can enter the second cavity 52 through the second piston 6, the reliability and flexibility of matching between the second piston 6 and the connecting hole 53 are guaranteed, friction between the second piston 6 and the inner wall of the second cavity 52 is reduced, the reliability of the pump body assembly 100 for compressing the refrigerant is guaranteed, the reliability of the pump body assembly 100 for working is improved, and the service life of the pump body assembly 100 can be prolonged to a certain extent.

Specifically, the oil groove 62 is formed in a closed ring shape. Thereby can guarantee reliable sliding fit between the inner wall of second piston 6 and second chamber 52, reduce the friction between the inner wall of second piston 6 and second chamber 52 effectively to be favorable to prolonging pump body assembly 100's life, improve pump body assembly 100 reliability of working. Meanwhile, the oil groove 62 is convenient to produce and process, and the manufacturing efficiency of the pump body assembly 100 is improved.

According to some embodiments of the invention, the portion of the second piston 6 that is in sliding engagement with the inner wall of the second chamber 52 is provided with a weight-reducing groove 64. Therefore, the production material of the second piston 6 can be reduced to a certain extent, the manufacturing cost of the pump body assembly 100 is reduced, the lightweight of the pump body assembly 100 is facilitated, the portability and the flexibility of the second piston 6 moving in the second cavity 52 are improved, and meanwhile, the labor force of operators for installing the pump body assembly 100 can be reduced to a certain extent.

In some embodiments of the invention, the weight-reduction grooves 64 are provided on the side wall of the second piston 6 toward the center of the bearing 5. That is, the lightening groove 64 opens toward the bearing 5, so that the second piston 6 can be lightened, and the influence of the second piston 6 on the uniformity of compression of the refrigerant in the second chamber 52 due to the arrangement of the lightening groove 64 can be avoided to some extent.

Further, the lightening groove 64 is formed as an annular groove extending around the piston rod 61. Therefore, the structural distribution of the second piston 6 is uniform, the processing and the manufacturing of the weight-reducing groove 64 are convenient, and the reliability of the reciprocating movement of the second piston 6 in the second chamber 52 is ensured.

According to some embodiments of the present invention, the outer peripheral wall of the bearing 5 is provided with a slit 54 communicating with the second chamber 52, the valve plate assembly 7 is provided at the slit 54, and the secondary exhaust port and the secondary suction port are provided in the valve plate assembly 7, respectively. Therefore, the reliability of the refrigerant compressed by the second chamber 52 can be ensured, the structure of the pump body assembly 100 is more reliable, the occupied space of the pump body assembly 100 is reduced, and the utilization rate of the space of the pump body assembly 100 is improved.

Specifically, the valve plate assembly 7 includes a suction and exhaust valve plate 71 and a suction and exhaust cavity plate 72 located at the outer end of the second chamber 52, the suction and exhaust cavity plate 72 is located inside the suction and exhaust valve plate 71, the suction and exhaust cavity plate 72 is provided with a plurality of cavities 72a penetrating through the suction and exhaust valve plate in the thickness direction thereof, the plurality of cavities 72a are arranged at intervals, a sealing gasket (not shown) is arranged at one end of the suction and exhaust cavity plate 72 close to the suction and exhaust valve plate 71, and the suction and exhaust valve plate 61 is provided with a suction valve (not shown) and an exhaust valve (not shown) to control the inlet and outlet of the refrigerant in the second chamber 52. Therefore, the reliability of the valve plate assembly 7 can be ensured, so that the refrigerant entering the second chamber 52 through the auxiliary suction port enters the second chamber 52 after passing through the cavities 72a of the suction and exhaust type cavity plate 72. The sealing gasket is arranged to ensure the sealing performance of the second chamber 52 to a certain extent.

According to some embodiments of the present invention, the bearing 5 is provided with a plurality of second chambers 52 spaced apart along the circumferential direction, and each second chamber 52 is provided with the second piston 6, the secondary exhaust port, and the secondary suction port. Therefore, the pump body assembly 100 can realize multi-stage compression or multi-cylinder compression, realize application of multiple compression types, further improve the compression capacity of the pump body assembly 100 on refrigerants, and improve the working efficiency of the pump body assembly 100.

In some embodiments of the invention, the end of the second piston 6 that stops against the second eccentric 12 is formed as an arc-shaped surface. Therefore, the second piston 6 and the second eccentric part 12 form line contact, the flexibility of contact and matching of the second piston 6 and the second eccentric part 12 can be improved to a certain degree, and the reliability of the reciprocating movement of the second piston 6 driven by the second eccentric part 12 is ensured.

According to some embodiments of the invention, a shaft seal is provided between the second piston 6 and the connection hole 53. Therefore, the high-pressure refrigerant in the second chamber 52 can be effectively prevented from flowing into the movable space 51 through the connecting hole 53, and the working efficiency of the pump body assembly 100 is improved.

The upper end of the second eccentric portion 12 is provided with a thrust portion (not shown). Thereby contributing to improved structural strength and reliability of the pump body assembly 100.

It will be appreciated that the pump body assembly 100 includes an exhaust passage (not shown) in communication with the primary exhaust port. When the exhaust passage is provided in the main bearing 5a, the second cavity 52 cannot be provided in the main bearing 5a except for the exhaust passage, and a plurality of second cavities 52 may be provided in the main bearing 5 a. If the exhaust passage is provided in the sub-bearing 5b, the second chamber 52 may be provided at any position in the circumferential direction of the main bearing 5 a. Similarly, when the exhaust passage is provided in the sub-bearing 5b, the second chamber 52 cannot be provided in the sub-bearing 5b except for the exhaust passage, and a plurality of second chambers 52 may be provided in the sub-bearing 5 b. If the exhaust passage is provided in the main bearing 5a, the second chamber 52 may be provided at any position in the circumferential direction of the sub-bearing 5 b.

The rotary compressor 200 according to an embodiment of the present invention includes: pump body assembly 100 and motor assembly 301.

Specifically, the pump block assembly 100 is the pump block assembly 100 for the rotary compressor 200 according to the above-described embodiment of the present invention. Therefore, the rotary compressor 200 can realize multi-stage compression or multi-cylinder compression, realize application of various compression types, improve the compression capacity of the rotary compressor 200 on a refrigerant to a certain extent, expand the application range of the rotary compressor 200, improve the flexibility of the use of the rotary compressor 200, and further improve the working efficiency of the rotary compressor 200.

The crankshaft 1 is connected to a motor assembly 301 to be driven in rotation by the motor assembly 301. Therefore, the rotary compressor 200 according to the embodiment of the present invention can provide a power source for the first piston 3 and the second piston 6 by only one motor, so that the number of parts of the rotary compressor 200 can be reduced to a certain extent, the volume and the weight of the rotary compressor 200 can be reduced, the structure of the rotary compressor 200 is compact, the rotary compressor 200 can be miniaturized and lightened, and the manufacturing cost of the rotary compressor 200 can be reduced to a certain extent.

It is understood that the rotary compressor 200 according to the embodiment of the present invention can be used as a single cylinder compressor or a double cylinder compressor, and can also be used as a multi-cylinder compressor (where "more" means more than two) if the pump body assembly 100 is provided in plurality. Meanwhile, the rotary compressor 200 according to the embodiment of the present invention may be formed as a fixed frequency compressor or an inverter compressor. Thereby making the rotary compressor 200 widely used.

According to the rotary compressor 200 of the embodiment of the present invention, by providing the pump body assembly 100 according to the above-described embodiment of the present invention, multi-stage compression or multi-cylinder compression can be achieved, application of various compression types can be achieved, the compression capability of the rotary compressor 200 on a refrigerant can be improved to a certain extent, the application range of the rotary compressor 200 can be expanded, the flexibility of the use of the rotary compressor 200 can be improved, and further, the working efficiency of the rotary compressor 200 can be improved.

Specifically, the rotary compressor 200 further includes a housing 201, and the motor assembly 301 and the pump body assembly 100 are disposed within the housing 201. Thereby, it is possible to improve the safety and reliability of the rotary compressor 200 and simultaneously to ensure that the rotary compressor 200 is not interfered by the outside when operating.

Specifically, the motor assembly 301 includes a stator 311 and a rotor 312, and the crankshaft 1 is engaged with the rotor 312 to be driven to rotate by the rotor 312. Thereby ensuring the reliability of the operation of the pump body assembly 100 and thus the rotary compressor 200.

Specifically, the rotary compressor 200 further includes an accumulator 401, the accumulator 401 having an inlet 401b and an outlet 401a, the outlet 401a of the accumulator 401 being connected to the cylinder 2 to introduce the gaseous refrigerant into the cylinder 2. Thereby, the safety and reliability of the rotary compressor 200 can be ensured, and the liquid impact phenomenon of the rotary compressor 200 can be effectively prevented.

Other constructions and operations of the rotary compressor 200 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.