Pump body assembly and rotary compressor having the same

Abstract

The present invention discloses a pump body assembly and a rotary compressor having the same. The pump body assembly includes: a crankshaft, the crankshaft having a first eccentric portion and a second eccentric portion; a cylinder, a first chamber defined therein, and a vane groove provided on the cylinder; a first piston, the first piston being disposed on a sleeve on the first eccentric portion and rotatably disposed in the first chamber; a vane, the vane being disposed in the vane groove and reciprocatingly movable; a bearing, the bearing being disposed on the crankshaft and having a movable space for the second eccentric portion therein, the bearing being provided with a second chamber, and a connecting hole being provided on a sidewall of the second chamber and communicating with the movable space; a second piston, the second piston being reciprocatingly movable in the second chamber, the piston rod of the second piston passing through the connecting hole to abut against the second eccentric portion so as to be driven to reciprocate by the second eccentric portion. The pump body assembly of the present invention can realize multi-stage compression or multi-cylinder compression, and the pump body assembly has a strong refrigerant compression capability and high working efficiency.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and in particular to a pump body assembly and a rotary compressor having the same. Background Art

[0002] In related technologies, the application of rotary compressors is becoming more and more common, and related technicians have increasingly higher requirements for pump body assemblies used in rotary compressors. However, most pump body assemblies have a single compression type, and the compression capacity of the pump body assemblies for the refrigerant and the working efficiency of the pump body assemblies need to be improved. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a pump assembly for a rotary compressor that can achieve multi-stage compression or multi-cylinder compression, has a strong refrigerant compression capacity, and has high working efficiency.

[0004] The present invention also provides a rotary compressor comprising the above-mentioned pump body assembly.

[0005] A pump assembly for a rotary compressor according to an embodiment of the present invention includes: a crankshaft having a first eccentric portion and a second eccentric portion; a cylinder defining a first chamber therein and having a vane groove therein; a first piston disposed on a sleeve of the first eccentric portion and rotatably disposed in the first chamber; a vane disposed in the vane groove for reciprocal movement, with a tip end of the vane abutting against an outer peripheral wall of the first piston; a bearing located on one side of the cylinder, the bearing being disposed on a sleeve of the crankshaft and having a movable space for the second eccentric portion therein; a second chamber disposed on the bearing, the second chamber having a secondary exhaust port and a secondary intake port, and a connecting hole in communication with the movable space being provided on a sidewall of the second chamber; and a second piston disposed in the second chamber for reciprocal movement, the piston rod of the second piston passing through the connecting hole to abut against the second eccentric portion so as to be driven to reciprocate by the second eccentric portion. The reciprocating movement of the second piston causes a change in the volume of the second chamber and switches between opening and closing the secondary exhaust port and the secondary intake port.

[0006] According to the pump body assembly for a rotary compressor according to an embodiment of the present invention, a second chamber is provided on the bearing, a second piston is provided in the second chamber, and the second piston is passed through the connecting hole to stop on the second eccentric part so as to be driven to move back and forth by the first piston, so that the pump body assembly can achieve multi-stage compression or multi-cylinder compression and realize the application of various compression types. To a certain extent, the compression capacity of the pump body assembly for the refrigerant can be improved, the application range of the pump body assembly can be expanded, the flexibility of the use of the pump body assembly can be improved, and the working efficiency of the pump body assembly can be improved.

[0007] According to some embodiments of the present invention, the first eccentric portion and the second eccentric portion are spaced apart from each other along the axial direction of the crankshaft.

[0008] According to some embodiments of the present invention, the piston rod is clearance-fitted with the connecting hole.

[0009] In some embodiments of the present invention, an oil groove is provided on the peripheral wall of the second piston that cooperates with the inner wall of the second chamber, and the second piston is provided with an oil hole that is respectively connected to the connecting hole and the oil groove.

[0010] Specifically, the oil groove is formed in a closed ring shape.

[0011] According to some embodiments of the present invention, a portion of the second piston that is in sliding engagement with an inner wall of the second chamber is provided with a weight-reducing groove.

[0012] In some embodiments of the present invention, the weight-reducing groove is provided on a side wall of the second piston facing the center of the bearing.

[0013] Furthermore, the weight-reducing groove is formed as an annular groove extending around the piston rod.

[0014] According to some embodiments of the present invention, the outer peripheral wall of the bearing is provided with a cutout communicating with the second chamber, a valve plate assembly is provided at the cutout, and the auxiliary exhaust port and the auxiliary intake port are respectively provided on the valve plate assembly.

[0015] According to some embodiments of the present invention, the bearing is provided with a plurality of second chambers spaced apart along the circumferential direction, and each second chamber is correspondingly provided with the second piston, the secondary exhaust port and the secondary intake port.

[0016] According to an embodiment of the present invention, a rotary compressor includes: a pump body assembly, which is the pump body assembly for a rotary compressor according to the above embodiment of the present invention; and a motor assembly, wherein the crankshaft is connected to the motor assembly to be driven to rotate by the motor assembly.

[0017] According to the rotary compressor of the embodiment of the present invention, by setting the pump body assembly according to the above-mentioned embodiment of the present invention, multi-stage compression or multi-cylinder compression can be achieved, and the application of various compression types can be achieved. To a certain extent, the compression capacity of the rotary compressor for the refrigerant can be improved, the application range of the rotary compressor can be expanded, and the flexibility of the use of the rotary compressor can be improved, thereby improving the working efficiency of the rotary compressor.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0020] Figure 1 is a schematic diagram of a rotary compressor according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Enlarged view of part A;

[0022] Figure 3 is a schematic diagram of a pump body assembly according to an embodiment of the present invention.

[0023] Reference numerals:

[0024] Pump body assembly 100;

[0025] Crankshaft 1; first eccentric portion 11; second eccentric portion 12;

[0026] Cylinder 2; first chamber 21; main air intake port 21a;

[0027] First piston 3;

[0028] Bearing 5; main bearing 5a; auxiliary bearing 5b; movable space 51; second chamber 52; connecting hole 53; cutout 54;

[0029] Second piston 6; piston rod 61; oil groove 62; oil hole 63; weight reduction groove 64;

[0030] Valve plate assembly 7; suction and exhaust valve plate 71; suction and exhaust cavity plate 72; cavity 72a;

[0031] Rotary compressor 200;

[0032] Housing 201;

[0033] Motor assembly 301; stator 311; rotor 312;

[0034] Liquid reservoir 401; outlet 401a; inlet 401b. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "length", "thickness", "upper", "lower", "inner", "outer", "axial", "circumferential", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0038] Reference below Figure 1-Figure 3 A pump body assembly 100 for a rotary compressor 200 according to an embodiment of the present invention is described.

[0039] like Figure 1-Figure 3 As shown, the pump body assembly 100 for the rotary compressor 200 according to an embodiment of the present invention includes: a crankshaft 1, a cylinder 2, a first piston 3, a sliding vane, a bearing 5 and a second piston 6.

[0040] Specifically, the crankshaft 1 is provided with a first eccentric portion 11 and a second eccentric portion 12. A first chamber 21 is defined within the cylinder 2, which is provided with a vane groove. The first piston 3 is positioned over the first eccentric portion 11 and rotatably disposed within the first chamber 21. In other words, the first piston 3 is driven to rotate by the first eccentric portion 11.

[0041] The vane is reciprocally mounted within the vane groove, with its tip abutting against the outer circumferential wall of the first piston 3. The first piston 3 and the vane cooperate to separate the first chamber 21 into an intake chamber and an exhaust chamber. It will be appreciated that as the first piston 3 rotates within the first chamber 21, driven by the first eccentric portion 11, the volumes of the intake and exhaust chambers continuously change.

[0042] Specifically, the first chamber 21 is provided with a main air intake port 21a and a main air exhaust port (not shown in the figure), wherein the air intake chamber has the main air intake port 21a, and the air exhaust chamber has the main air exhaust port. Thus, when the refrigerant gas enters the air intake chamber through the main air intake port 21a, as the first piston 3 rotates in the first chamber 21, the refrigerant gas in the air intake chamber gradually enters the air exhaust chamber, and under the action of the rotation of the first piston 3, the volume of the air exhaust chamber gradually changes to achieve a gradual compression of the refrigerant, thereby achieving the compression of the refrigerant by the pump body assembly 100. The compressed high-pressure refrigerant can be discharged from the first chamber 21 through the main air exhaust port, thereby ensuring the normal operation of the pump body assembly 100.

[0043] The bearing 5 is located on one side of the cylinder 2. It is externally mounted on the crankshaft 1 and contains a movable space 51 for the second eccentric portion 12. The bearing 5 also contains a second chamber 52, which is equipped with a secondary exhaust port (not shown) and a secondary intake port (not shown). A connecting hole 53 is provided on the sidewall of the second chamber 52, communicating with the movable space 51. Therefore, the second eccentric portion 12 can rotate within the movable space 51.

[0044] It is understood 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. In other words, the second chamber 52 may be provided on the main bearing 5a and / or the secondary bearing 5b.

[0045] The second piston 6 is reciprocally mounted within the second chamber 52. Its piston rod 61 passes through the connecting hole 53 and abuts against the second eccentric portion 12, allowing it to reciprocate. This reciprocating movement of the second piston 6 changes the volume of the second chamber 52 and switches the secondary exhaust port and the secondary intake port open. Therefore, the second piston 6 is driven to rotate by the second eccentric portion 12. In other words, both the first piston 3 and the second piston 6 are driven to rotate by the crankshaft 1.

[0046] Thus, when the second piston 6 moves toward the movable space 51 under the drive of the second eccentric portion 12, the volume of the second chamber 52 increases, causing the pressure inside the second chamber 52 to be lower than the pressure outside the second chamber 52. Under the action of the pressure differential, the auxiliary suction port is opened, enabling the pump body assembly 100 to draw refrigerant. Refrigerant enters the second chamber 52 through the auxiliary suction port. Under the reciprocating action of the second piston 6, the volume of the second chamber 52 gradually changes, thereby gradually compressing the refrigerant in the second chamber 52, thereby achieving refrigerant compression by the pump body assembly 100. When the refrigerant in the second chamber 52 is compressed and the pressure inside the second chamber 52 is higher than the pressure outside the second chamber 52, the auxiliary exhaust port is opened under the action of the pressure differential, thereby discharging the high-pressure refrigerant from the second chamber 52. This ensures the reliability of the switching opening of the auxiliary exhaust port and the auxiliary suction port, thereby ensuring the normal operation of the pump body assembly 100.

[0047] It can be seen that in the pump body assembly 100 of the embodiment of the present invention, when the main exhaust port is connected to the auxiliary intake port, or the auxiliary exhaust port is connected to the main intake port 21a, the pump body assembly 100 can achieve two-stage compression of the refrigerant. When the intake and exhaust of the first chamber 21 and the second chamber 52 are independent of each other, the pump body assembly 100 can achieve two-cylinder independent compression of the refrigerant. This enables the pump body assembly 100 to achieve multi-stage compression or multi-cylinder compression, which can improve the compression capacity of the pump body assembly 100 for the refrigerant to a certain extent, realize the application of various compression types, expand the application range of the pump body assembly 100, improve the flexibility of the use of the pump body assembly 100, and thus improve the working efficiency of the pump body assembly 100. It should be noted here that "multi-stage" means two stages or more, and "multi-cylinder" means two cylinders or more.

[0048] It can be understood that the rotary compressor 200 also includes a motor assembly 301. The pump body assembly 100 of the embodiment of the present invention can be connected to the motor assembly 301 through the crankshaft 1 so that the crankshaft 1 is driven to rotate by the motor assembly 301, so that the rotary compressor 200 using the pump body assembly 100 of the embodiment of the present invention can be provided with a power source by only one motor, thereby reducing the number of parts 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, which is conducive to the miniaturization and lightweight of the rotary compressor 200, and can also reduce the manufacturing cost of the rotary compressor 200 to a certain extent.

[0049] It should also be noted that if it is to be ensured that the piston rod 61 of the second piston 6 always stops against the second eccentric part 12 so as to be driven to move back and forth by the second eccentric part 12, this can be achieved by ensuring that the pressure generated by the refrigerant in the second chamber 52 on the second piston 6 is greater than the pressure generated by the gas in the active space 51 on the second piston 6. Thus, under the action of the pressure difference, the piston rod 61 of the second piston 6 can be ensured to always stop against the second eccentric part 12 so as to be driven to move back and forth by the second eccentric part 12.

[0050] 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 active space 51, so that the piston rod 61 of the second piston 6 can be guaranteed to always rest on the second eccentric part 12 so as to be driven to move back and forth by the second eccentric part 12. 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 active space 51. In this case, the pressure areas of the two ends of the second piston 6 (the end resting on the second eccentric portion 12 and the end in contact with the refrigerant in the second chamber 52) must be controlled to be different. That is, the pressure area of ​​the end of the second piston 6 resting on the second eccentric portion 12 must be controlled to be smaller than the pressure area of ​​the end of the second piston 6 in contact with the refrigerant in the second chamber 52. The product of the pressure area of ​​the end of the second piston 6 resting on the second eccentric portion 12 and the pressure thereat must be controlled to be smaller than the product of the pressure area of ​​the end of the second piston 6 in contact with the refrigerant in the second chamber 52 and the pressure thereat. Thus, the pressure exerted on the second piston 6 by the refrigerant in the second chamber 52 is greater than the pressure exerted on the second piston 6 by the gas in the active space 51. This ensures that the piston rod 61 of the second piston 6 can always rest on the second eccentric portion 12 so as to be driven to reciprocate by the second eccentric portion 12.

[0051] According to the pump body assembly 100 for the rotary compressor 200 according to an embodiment of the present invention, a second chamber 52 is provided on the bearing 5, a second piston 6 is provided in the second chamber 52, and the second piston 6 is passed through the connecting hole 53 to stop on the second eccentric portion 12 so as to be driven to move back and forth by the first piston 3, so that the pump body assembly 100 can achieve multi-stage compression or multi-cylinder compression and realize the application of various compression types, which can improve the compression capacity of the pump body assembly 100 for the refrigerant to a certain extent, expand the application range of the pump body assembly 100, improve the flexibility of the use of the pump body assembly 100, and thus improve the working efficiency of the pump body assembly 100.

[0052] According to some embodiments of the present invention, the first eccentric portion 11 and the second eccentric portion 12 are spaced apart along the axial direction of the crankshaft 1. This ensures that the first eccentric portion 11 and the second eccentric portion 12 respectively drive the first piston 3 to rotate and the second piston 6 to reciprocate, thereby improving the reliability of the pump body assembly 100.

[0053] According to some embodiments of the present invention, the piston rod 61 is loosely fitted with the connecting hole 53. This ensures the reliability and flexibility of the reciprocating movement of the second piston 6 in the connecting hole 53, thereby ensuring the reliability of the pump assembly 100 in compressing the refrigerant and improving the reliability of the pump assembly 100.

[0054] Specifically, the gap between the piston rod 61 and the connecting hole 53 is 0.02-0.04 mm. This not only ensures the reliability and flexibility of the reciprocating movement of the second piston 6 within the connecting hole 53, but also, when the pressure within the active space 51 is greater than the pressure in the second chamber 52, the size of the gap between the piston rod 61 and the connecting hole 53 can, to a certain extent, prevent gas within the active space 51 from entering the second chamber 52 through the gap, thereby improving the reliability of the pump assembly 100 in compressing the refrigerant.

[0055] In some embodiments of the present invention, an oil groove 62 is provided on the peripheral wall of the second piston 6 that cooperates with the inner wall of the second chamber 52. The second piston 6 is also provided with an oil hole 63 that communicates with the connecting hole 53 and the oil groove 62, respectively. This allows lubricating oil to enter the second chamber 52 through the second piston 6, thereby ensuring the reliability and flexibility of the cooperation between the second piston 6 and the connecting hole 53, reducing friction between the second piston 6 and the inner wall of the second chamber 52, and thus ensuring the reliability of the pump assembly 100 in compressing the refrigerant, improving the reliability of the pump assembly 100, and also extending the service life of the pump assembly 100 to a certain extent.

[0056] Specifically, the oil groove 62 is formed in a closed ring shape. This ensures a reliable sliding fit between the second piston 6 and the inner wall of the second chamber 52, effectively reducing friction between the second piston 6 and the inner wall of the second chamber 52, thereby extending the service life of the pump assembly 100 and improving the reliability of the pump assembly 100. Furthermore, the oil groove 62 is easily produced and processed, thereby improving the manufacturing efficiency of the pump assembly 100.

[0057] According to some embodiments of the present invention, a weight-reducing groove 64 is provided in the portion of the second piston 6 that slidably engages with the inner wall of the second chamber 52. This can reduce the material used to produce the second piston 6 to a certain extent, lowering the manufacturing cost of the pump assembly 100. This also contributes to the lightweighting of the pump assembly 100, improving the portability and flexibility of the second piston 6 in moving within the second chamber 52, and reducing the labor required by operators when installing the pump assembly 100 to a certain extent.

[0058] In some embodiments of the present invention, a weight-reducing groove 64 is provided on the side wall of the second piston 6 facing the center of the bearing 5. In other words, the opening of the weight-reducing groove 64 faces the bearing 5, thereby reducing the weight of the second piston 6 while also, to a certain extent, preventing the second piston 6 from affecting the uniformity of the refrigerant compression in the second chamber 52 due to the provision of the weight-reducing groove 64.

[0059] Furthermore, the weight-reducing groove 64 is formed as an annular groove extending around the piston rod 61 , thereby making the structure of the second piston 6 evenly distributed, facilitating the processing and manufacturing of the weight-reducing groove 64 , and ensuring the reliability of the reciprocating movement of the second piston 6 in the second chamber 52 .

[0060] According to some embodiments of the present invention, the outer peripheral wall of the bearing 5 is provided with a cutout 54 communicating with the second chamber 52. A valve plate assembly 7 is provided at the cutout 54, and a secondary exhaust port and a secondary intake port are respectively provided on the valve plate assembly 7. This ensures the reliability of the refrigerant compression in the second chamber 52, making the structure of the pump body assembly 100 more reliable, while also helping to reduce the space occupied by the pump body assembly 100 and improving the utilization rate of the space within the pump body assembly 100.

[0061] Specifically, the valve plate assembly 7 includes an intake and exhaust valve plate 71 and an intake and exhaust cavity plate 72 located at the outer end of the second chamber 52. The intake and exhaust cavity plate 72 is located on the inner side of the intake and exhaust valve plate 71. The intake and exhaust cavity plate 72 is provided with a plurality of cavities 72a extending through the intake and exhaust cavity plate 72 in the thickness direction. The plurality of cavities 72a are arranged at intervals, and a sealing gasket (not shown) is provided at one end of the intake and exhaust cavity plate 72 close to the intake and exhaust valve plate 71. The intake and exhaust valve plate 61 is provided with an intake valve (not shown) and an exhaust valve (not shown) to control the inflow and outflow of the refrigerant in the second chamber 52. This ensures the reliability of the valve plate assembly 7, so that the refrigerant entering the second chamber 52 through the auxiliary intake port must pass through the cavities 72a on the intake and exhaust cavity plate 72 before entering the second chamber 52. The provision of the sealing gasket can ensure the sealing of the second chamber 52 to a certain extent.

[0062] According to some embodiments of the present invention, bearing 5 is provided with a plurality of second chambers 52 spaced circumferentially therefrom, each of which is provided with a corresponding second piston 6, a secondary exhaust port, and a secondary intake port. This allows pump assembly 100 to implement multi-stage or multi-cylinder compression, enabling various compression types, further improving the refrigerant compression capability of pump assembly 100 and enhancing its operating efficiency.

[0063] In some embodiments of the present invention, the second piston 6 stops at one end of the second eccentric portion 12 and is formed as an arc-shaped surface. This allows the second piston 6 to form a linear contact with the second eccentric portion 12, thereby improving the flexibility of the contact and cooperation between the second piston 6 and the second eccentric portion 12 to a certain extent, and ensuring the reliability of the reciprocating movement of the second piston 6 driven by the second eccentric portion 12.

[0064] According to some embodiments of the present invention, a shaft seal is provided between the second piston 6 and the connecting hole 53. This can effectively prevent the high-pressure refrigerant in the second chamber 52 from flowing into the active space 51 through the connecting hole 53, thereby improving the working efficiency of the pump assembly 100.

[0065] A thrust portion (not shown) is provided at the upper end of the second eccentric portion 12 , thereby facilitating improvement of the structural strength and reliability of the pump assembly 100 .

[0066] It is understood that the pump body assembly 100 includes an exhaust passage (not shown) connected to the main exhaust port. When the exhaust passage is provided on the main bearing 5a, the second chamber 52 cannot be provided on the main bearing 5a except at the exhaust passage, and multiple second chambers 52 can be provided on the main bearing 5a. If the exhaust passage is provided on the secondary bearing 5b, the second chamber 52 can be provided at any position in the circumferential direction of the main bearing 5a. Similarly, when the exhaust passage is provided on the secondary bearing 5b, the second chamber 52 cannot be provided on the secondary bearing 5b except at the exhaust passage, and multiple second chambers 52 can be provided on the secondary bearing 5b. If the exhaust passage is provided on the main bearing 5a, the second chamber 52 can be provided at any position in the circumferential direction of the secondary bearing 5b.

[0067] The rotary compressor 200 according to the embodiment of the present invention includes a pump body assembly 100 and a motor assembly 301 .

[0068] Specifically, the pump body assembly 100 is a pump body assembly 100 for a rotary compressor 200 according to the above-described embodiment of the present invention. This allows the rotary compressor 200 to achieve multi-stage compression or multi-cylinder compression, enabling the application of various compression types. This can improve the refrigerant compression capacity of the rotary compressor 200 to a certain extent, expand the application range of the rotary compressor 200, increase the flexibility of the use of the rotary compressor 200, and thereby improve the operating efficiency of the rotary compressor 200.

[0069] The crankshaft 1 is connected to the motor assembly 301 and is driven to rotate by the motor assembly 301. As a result, the rotary compressor 200 of 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, 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 lightweighting of the rotary compressor 200, and reducing the manufacturing cost of the rotary compressor 200 to a certain extent.

[0070] It is understood that the rotary compressor 200 of the embodiment of the present invention can be used as a single-cylinder compressor or a two-cylinder compressor. If multiple pump body assemblies 100 are provided, it can also be used as a multi-cylinder compressor ("multiple" here refers to more than two). Furthermore, the rotary compressor 200 of the embodiment of the present invention can be formed as a fixed-frequency compressor or a variable-frequency compressor, thereby making the rotary compressor 200 widely applicable.

[0071] According to the rotary compressor 200 of the embodiment of the present invention, by setting the pump body assembly 100 according to the above-mentioned embodiment of the present invention, multi-stage compression or multi-cylinder compression can be achieved, and the application of various compression types can be achieved. The compression capacity of the rotary compressor 200 for the refrigerant can be improved to a certain extent, the application range of the rotary compressor 200 can be expanded, and the flexibility of the use of the rotary compressor 200 can be improved, thereby improving the working efficiency of the rotary compressor 200.

[0072] Specifically, the rotary compressor 200 further includes a housing 201, and the motor assembly 301 and the pump assembly 100 are disposed in the housing 201. This can improve the safety and reliability of the rotary compressor 200 and ensure that the rotary compressor 200 is not interfered with by the outside world during operation.

[0073] Specifically, the motor assembly 301 includes a stator 311 and a rotor 312. The crankshaft 1 cooperates with the rotor 312 to be driven to rotate by the rotor 312. This ensures the reliability of the pump assembly 100 and further the reliability of the rotary compressor 200.

[0074] Specifically, the rotary compressor 200 further includes a liquid accumulator 401 having an inlet 401b and an outlet 401a. The outlet 401a of the liquid accumulator 401 is connected to the cylinder 2 to introduce the gas refrigerant into the cylinder 2. This ensures the safety and reliability of the rotary compressor 200 and effectively prevents liquid hammer from occurring in the rotary compressor 200.

[0075] Other structures and operations of the rotary compressor 200 according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0076] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0077] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A pump assembly for a rotary compressor, characterized in that: include: a crankshaft having a first eccentric portion and a second eccentric portion; a cylinder, wherein a first chamber is defined in the cylinder and a sliding vane groove is provided on the cylinder; a first piston, the first piston being disposed on the first eccentric portion and being rotatably disposed in the first chamber; a sliding vane, the sliding vane being reciprocally movable in the sliding vane groove, one end of the sliding vane being abutted against the outer peripheral wall of the first piston; A bearing, the bearing being located on one side of the cylinder, the bearing sleeve being arranged on the crankshaft and having a movable space for the second eccentric portion defined therein, the bearing being provided with a second chamber, the second chamber being provided with a secondary exhaust port and a secondary intake port, and a connecting hole being provided on a side wall of the second chamber and communicating with the movable space; a second piston reciprocatably disposed in the second chamber, a piston rod of the second piston passing through the connecting hole to abut against the second eccentric portion so as to be driven to reciprocate by the second eccentric portion, the reciprocating movement of the second piston causing the volume of the second chamber to change and the auxiliary exhaust port and the auxiliary intake port to switch open; The piston rod is in clearance fit with the connecting hole; An oil groove is provided on the peripheral wall of the second piston that cooperates with the inner wall of the second chamber, and an oil hole is provided on the second piston that is respectively connected to the connecting hole and the oil groove.

2. The pump body assembly for a rotary compressor according to claim 1, characterized in that: The first eccentric portion and the second eccentric portion are spaced apart from each other in the axial direction of the crankshaft.

3. The pump assembly for a rotary compressor according to claim 1, characterized in that: The oil groove is formed in a closed ring shape.

4. The pump assembly for a rotary compressor according to claim 1, characterized in that: A weight-reducing groove is provided on a portion of the second piston that is slidably engaged with the inner wall of the second chamber.

5. The pump assembly for a rotary compressor according to claim 4, characterized in that: The weight-reducing groove is provided on a side wall of the second piston facing the center of the bearing.

6. The pump assembly for a rotary compressor according to claim 5, characterized in that: The lightening groove is formed as an annular groove extending around the piston rod.

7. The pump assembly for a rotary compressor according to claim 1, characterized in that: The outer peripheral wall of the bearing is provided with a cutout communicated with the second chamber, a valve plate assembly is provided at the cutout, and the auxiliary exhaust port and the auxiliary air intake port are respectively provided on the valve plate assembly.

8. The pump assembly for a rotary compressor according to any one of claims 1 to 7, characterized in that: The bearing is provided with a plurality of second chambers spaced apart along the circumferential direction, and each second chamber is correspondingly provided with the second piston, the auxiliary exhaust port and the auxiliary intake port.

9. A rotary compressor, characterized in that: include: A pump body assembly, wherein the pump body assembly is a pump body assembly for a rotary compressor according to any one of claims 1 to 8; The crankshaft is connected to the motor assembly so as to be driven to rotate by the motor assembly.

Images