A pump body assembly and compressor

Abstract

The application relates to the technical field of compressors of energy-saving air conditioners, and discloses a pump body assembly and a compressor. The pump body assembly comprises a cylinder and a fitting part, the fitting part is a flange or a partition plate, the cylinder is provided with an air suction hole and an air outlet, and the fitting part is attached to the end face of the cylinder. The cylinder is provided with an inflow hole, a backflow hole and a flow guide hole extending along the axial direction of the cylinder, and the inflow hole and the backflow hole are communicated with the air suction hole; a cooling groove is arranged on the end face of the cylinder, and the inlet end of the cooling groove is communicated with the flow guide hole; a first flow guide groove is arranged on the fitting part attached to the first end face of the cylinder, and a second flow guide groove is arranged on the fitting part attached to the second end face of the cylinder; the first flow guide groove is communicated with the inflow hole and the flow guide hole, and the second flow guide groove is communicated with the outlet end of the cooling groove and the backflow hole. The application forms a closed circulation loop of self-air suction holes taking flow, backflowing to the air suction holes after heat exchange through the cooling groove by using the structure of the pump body, and the exhaust temperature can be reduced without external pipelines.

Description

Technical Field

[0001] This invention relates to the field of compressor technology for energy-saving air conditioners, and more particularly to a pump assembly and a compressor. Background Technology

[0002] During operation, the refrigerant in the cylinder of an energy-saving air conditioner's rotary compressor generates a large amount of heat due to compression, leading to excessively high exhaust temperatures. Excessively high exhaust temperatures accelerate the wear and tear on pump components and can even cause motor overheating and failure. This problem is particularly pronounced in compressors using newer refrigerants such as R32, which have higher exhaust temperatures.

[0003] To reduce exhaust temperature, existing technologies have proposed solutions involving internal flow channel structures and the introduction of cooling media within the pump assembly. For example, patent document CN204386889U discloses a pump assembly and compressor, which features a vertical hole in the cylinder, a countersunk hole and a side hole in the flange, and connects the side hole of the flange to the outside of the compressor via an external pipeline. Coolant is then supplied to the pump assembly through this external pipeline to achieve cooling. While this solution offers good cooling, its reliance on external pipelines and their interface structures increases the overall size of the compressor and the piping volume of the air conditioning system, hindering compressor miniaturization and the compact design of the air conditioning system. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pump body assembly and compressor, which aims to achieve the reduction of exhaust temperature by utilizing the pump body's own structure without adding external components.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: In one aspect, the present invention provides a pump body assembly, comprising: A cylinder, wherein the cylinder is provided with an air intake port and an air exhaust port; A mating component, which is fitted to the end face of the cylinder, wherein the mating component is a flange or a partition; The cylinder is provided with an inlet hole, a return hole and a guide hole extending along its axial direction, and the inlet hole and the return hole are both connected to the intake hole; The cylinder has a cooling groove on its end face, and the inlet end of the cooling groove is connected to the guide hole. The fitting part that fits with the first end face of the cylinder has a first guide groove, and the fitting part that fits with the second end face of the cylinder has a second guide groove. The first guide groove connects the inlet hole and the guide hole, and the second guide groove connects the outlet end of the cooling groove and the return hole.

[0006] Furthermore, the inlet end of the inlet hole is connected to the step of the intake hole, and the outlet end of the inlet hole extends to the first end face of the cylinder; the outlet end of the return hole is connected to the intake hole, and the inlet end of the return hole extends to the second end face of the cylinder; the guide hole penetrates through the first end face and the second end face of the cylinder.

[0007] Furthermore, the first guide channel is disposed on the mating surface of the mating component that is in contact with the first end face of the cylinder, one end of the first guide channel is axially connected to the outlet end of the inlet hole, and the other end of the first guide channel is axially connected to one end of the guide hole; the second guide channel is disposed on the mating surface of the mating component that is in contact with the second end face of the cylinder, one end of the second guide channel is axially connected to the outlet end of the cooling tank, and the other end of the second guide channel is axially connected to the inlet end of the return hole.

[0008] Furthermore, the projection of the first guide groove on the cylinder end face overlaps with the sliding vane groove of the cylinder.

[0009] Furthermore, the cooling tank is arranged on the side near the exhaust port.

[0010] Furthermore, the cooling groove has a channel structure with a tortuous and densely arranged channel.

[0011] Furthermore, the depth h of the cooling groove and the axial height H of the cylinder satisfy: H / 4 <h<H / 2。

[0012] Furthermore, the first guide channel has a straight channel structure, an arc channel structure, or a broken channel structure.

[0013] Furthermore, the cylinder may have one, two, or more.

[0014] Furthermore, the cylinder is provided in two parts, namely an upper cylinder and a lower cylinder, and the mating parts are provided in three parts, namely a first mating part, a second mating part, and a third mating part. The first mating part is an upper flange, the second mating part is a lower flange, and the third mating part is a partition plate. The partition plate is disposed between the upper cylinder and the lower cylinder. The first end face of the upper cylinder is in contact with the upper surface of the lower flange, the second end face of the upper cylinder is in contact with the lower surface of the partition plate, the first end face of the lower cylinder is in contact with the upper surface of the partition plate, and the second end face of the lower cylinder is in contact with the lower surface of the upper flange. The upper surface of the partition plate and the upper surface of the lower flange are provided with the first guide groove, and the lower surface of the partition plate and the lower surface of the upper flange are provided with the second guide groove.

[0015] On the other hand, the present invention also provides a compressor including the pump body assembly described above.

[0016] The beneficial effects of this invention compared to existing technologies are as follows: In the compressor of an energy-saving air conditioner, the inlet and outlet holes on the cylinder are connected to the suction port. These, along with the guide holes and cooling grooves, and the first guide groove on the flange or partition that fits against the cylinder end face connects the inlet and guide holes, while the second guide groove connects the outlet end of the cooling groove to the outlet hole. This naturally forms an internal closed-loop cooling flow path after the components are assembled, where the refrigerant is drawn from the suction port, absorbs heat through the cooling groove, and then flows back to the suction port. The cooling medium originates from a mixture of low-temperature refrigerant and refrigeration oil normally supplied to the suction port by the distributor, eliminating the need for external cooling medium. As the cooling medium flows through the cooling groove located on the cylinder end face, it exchanges heat with the cylinder, directly carrying away the heat generated during compression, thus effectively reducing the exhaust temperature. The entire cooling flow path is formed entirely within the cylinder and mating parts of the pump assembly, without relying on any external pipelines or additional interface structures. Therefore, it does not increase the external volume of the compressor or the piping volume of the air conditioning system. Meanwhile, after the cooling medium completes the heat exchange, it flows back to the suction port to participate in the subsequent compression process. There is no external loss of the refrigerant, which ensures that the operating efficiency of the compressor is not affected.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other objectives, features and advantages of the present invention more obvious and understandable, preferred embodiments are described in detail below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 An exploded view of a pump body assembly provided in a specific embodiment of the present invention; Figure 2 A cross-sectional view of a pump body assembly provided in a specific embodiment of the present invention. Figure 1 ; Figure 3 A cross-sectional view of a pump body assembly provided in a specific embodiment of the present invention. Figure 2 ; Figure 4 A cross-sectional view of a pump body assembly provided in a specific embodiment of the present invention. Figure 3 ; Figure 5 A schematic diagram of the cylinder provided in a specific embodiment of the present invention; Figure 6 This is a structural schematic diagram of a cylinder from another perspective, provided for a specific embodiment of the present invention; Figure 7 Cross-sectional view of a cylinder provided for a specific embodiment of the present invention Figure 1 ; Figure 8 Cross-sectional view of a cylinder provided for a specific embodiment of the present invention Figure 2 ; Figure 9 This is a schematic diagram of a partition plate as the mating component provided in a specific embodiment of the present invention; Figure 10 The sectional view of the partition plate provided for a specific embodiment of the present invention.

[0020] Figure Labels 1. Cylinder; 11. Intake port; 111. Step; 12. Exhaust port; 13. Inlet port; 14. Return port; 15. Guide port; 16. Cooling tank; 161. Inlet end of cooling tank; 162. Outlet end of cooling tank; 17. Sliding vane groove; 18. Sliding vane; 2. Mating parts; 21. First guide channel; 22. Second guide channel. Detailed Implementation

[0021] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] This invention provides a pump body assembly and a compressor having the pump body assembly, aiming to solve the problem in the prior art where energy-saving air conditioners rely on external pipelines to deliver cooling medium into the pump body in order to reduce exhaust temperature, resulting in an increase in the overall size of the compressor and the volume of the air conditioning system piping.

[0028] The basic concept of this invention is to machine an axially extending inlet hole, guide hole, and return hole on the cylinder of the pump body assembly, machine a cooling groove on the end face of the cylinder, and machine guide grooves on mating parts such as flanges or partitions that fit with the end face of the cylinder. When all parts are assembled, the inlet hole connects the suction hole and the first guide groove, the first guide groove connects the inlet hole and the guide hole, the guide hole connects the first guide groove and the inlet end of the cooling groove, the second guide groove connects the outlet end of the cooling groove and the return hole, and the return hole connects the second guide groove and the suction hole, thereby forming a complete closed-loop cooling flow path inside the pump body assembly, which draws water from the suction hole, exchanges heat through the cooling groove, and finally returns to the suction hole. This closed-loop flow path is entirely formed by the structural features of the internal parts of the pump body assembly and does not rely on any external pipes or additional interfaces, thus not increasing the external volume of the compressor or the piping volume of the air conditioning system. The cooling medium is directly taken from the low-temperature gaseous refrigerant and the liquid refrigerant and liquid refrigeration oil mixed in it, which are normally delivered to the suction port by the distributor, without the need for an additional external cooling medium supply source.

[0029] Example 1 like Figures 1 to 10 As shown (it should be noted that, Figures 1 to 10 The illustration shows the pump body assembly of a twin-cylinder rotary compressor. The difference between the pump body assembly of a twin-cylinder rotary compressor and that of a single-cylinder rotary compressor is the addition of a partition. Therefore, the pump body assembly of the single-cylinder rotary compressor in this embodiment can also be... Figures 1 to 10 As an auxiliary description, this embodiment uses the pump body assembly of a single-cylinder rotary compressor as an example. The pump body assembly includes a cylinder 1 and two mating parts 2, namely an upper flange and a lower flange, which are respectively fitted to the upper and lower end faces of the cylinder 1. The cylinder 1 has an intake port 11 and an exhaust port 12. The intake port 11 extends radially along the cylinder 1 and communicates with the compression chamber inside the cylinder 1. The exhaust port 12 is located on the exhaust side of the cylinder 1.

[0030] The cylinder 1 is provided with an inlet hole 13, a guide hole 15, and a return hole 14 extending along its axial direction. All three are axial channels penetrating the end face of the cylinder 1. The inlet hole 13 and the return hole 14 are respectively connected to the intake hole 11 of the cylinder 1. Specifically, the inlet end of the inlet hole 13 is connected to the step 111 between the inner and outer sections of the intake hole 11, and the outlet end of the inlet hole 13 extends to the first end face of the cylinder 1 (i.e., the lower end face of the cylinder 1). The outlet end of the return hole 14 is connected to the inner section region of the intake hole 11, and the inlet end of the return hole 14 extends to the second end face of the cylinder 1 (i.e., the upper end face of the cylinder 1). The guide hole 15 is located near the exhaust side of the cylinder 1 and penetrates the first and second end faces of the cylinder 1.

[0031] A cooling groove 16 is provided on the second end face of cylinder 1. The cooling groove 16 is a groove structure machined on the end face of cylinder 1, and the inlet end 161 of the cooling groove is connected to the guide hole 15. The lower flange, which is in contact with the first end face of cylinder 1, has a first guide groove 21 on its contact surface facing cylinder 1. One end of the first guide groove 21 is axially engaged with the outlet end of the inlet hole 13, and the other end is axially engaged with the guide hole 15. The upper flange, which is in contact with the second end face of cylinder 1, has a second guide groove 22 on its contact surface facing cylinder 1. One end of the second guide groove 22 is axially engaged with the outlet end 162 of the cooling groove, and the other end is axially engaged with the inlet end of the return hole 14.

[0032] Thus, the inlet hole 13 on cylinder 1, the first guide groove 21 on the lower flange, the guide hole 15 on cylinder 1, the cooling groove 16 on cylinder 1, the second guide groove 22 on the upper flange, and the return hole 14 on cylinder 1 are sequentially connected to form a complete and closed internal circulation path. The starting and ending points of this path are both located at the suction hole 11 of cylinder 1, and its working process is as follows: The distributor delivers the low-temperature gaseous refrigerant to the suction hole 11 of cylinder 1. During this process, the liquid refrigerant and liquid refrigeration oil that are often mixed in the gaseous refrigerant accumulate at the step 111 between the inner and outer sections of the suction hole 11 due to gravity. The low-temperature liquid mixture accumulated here is introduced into the first guide groove 21 through the inlet hole 13, and flows into the guide hole 15 under the guidance of the first guide groove 21, and enters the cooling groove 16 on the second end face of cylinder 1 through the guide hole 15. During the flow of the liquid / low-temperature gaseous refrigerant within the cooling tank 16, heat exchange occurs with the end face of the cylinder 1, absorbing the heat generated during compression. The liquid refrigerant vaporizes upon absorbing heat, while the low-temperature gaseous refrigerant decreases in density after absorbing heat, thereby carrying away heat from the cylinder 1 and lowering the exhaust temperature. After sufficient heat absorption, the gaseous refrigerant flows through the second guide channel 22 to the return port 14, and then re-enters the intake port 11 through the return port 14 to participate in the subsequent compression process.

[0033] The entire cooling flow path is formed within the internal structure of cylinder 1, the upper flange, and the lower flange, without relying on any external pipes or additional interfaces. Therefore, it does not increase the external volume of the compressor or the piping volume of the air conditioning system. Simultaneously, the cooling medium originates from the refrigerant / refrigeration oil mixture normally delivered to the suction port 11 by the distributor, eliminating the need for an external cooling medium supply source. This results in a compact structure and low cost. Furthermore, after heat exchange, the refrigerant re-enters the suction port 11 via the return port 14 to participate in the compression process, ensuring no external refrigerant loss and guaranteeing the compressor's operating efficiency.

[0034] like Figure 5As shown, the inlet end of the inlet hole 13 is located at step 111 between the inner and outer sections of the suction hole 11. The technical considerations are as follows: When the refrigerant delivered by the distributor flows through the suction hole 11, due to the change in the flow cross-section and the combined effects of gravity and centrifugal force, liquid refrigerant and liquid refrigeration oil mixed in the gaseous refrigerant tend to accumulate at step 111. If these liquid mixtures accumulate for a long time and reach a certain amount, they will be carried into the compression chamber inside the cylinder 1 by the airflow, causing liquid slugging and resulting in impact damage to parts such as rollers and vanes 18. By opening the inlet end of the inlet hole 13 at step 111, the liquid mixture accumulated here can be preferentially drawn out and enter the cooling flow path, thereby reducing the amount of liquid entering the compression chamber from the source, effectively reducing the risk of liquid slugging and protecting the compression components. At the same time, the drawn-out liquid refrigerant and liquid refrigeration oil, as a cooling medium, absorb heat from the cylinder 1 when flowing through the cooling tank 16.

[0035] The first guide groove 21 and the second guide groove 22 are respectively machined on the mating surfaces of the lower flange and the upper flange, and these mating surfaces are tightly fitted with the corresponding end faces of the cylinder 1 after assembly. One end of the first guide groove 21 is axially aligned with the outlet end of the inlet hole 13, and the other end is axially aligned with one end of the guide hole 15, thereby forming a transition channel connecting the inlet hole 13 and the guide hole 15 within the closed interface between the end face of the cylinder 1 and the mating surface of the flange. Similarly, one end of the second guide groove 22 is axially aligned with the outlet end 162 of the cooling tank, and the other end is axially aligned with the inlet end of the return hole 14, forming a transition channel connecting the cooling tank 16 and the return hole 14. This axial joining method allows the guide grooves to be machined only by milling on the flat mating surface of the flange, without the need to open channels on the side of the flange or to set oblique holes or curved channels inside the flange. This not only reduces the processing difficulty and manufacturing cost, but also avoids weakening the overall strength of the flange. During assembly, simply attach and fix the flange to cylinder 1 in the conventional manner, and the guide groove and the corresponding channel will automatically align to form a passage. The assembly process is simple and reliable.

[0036] In a rotary compressor, the vane 18 reciprocates within the vane groove 17, and friction exists between the end face and side face of the vane 18 and the wall of the vane groove 17. For example... Figure 3As shown, in this embodiment, the projection of the first guide groove 21 on the end face of the cylinder 1 partially overlaps with the vane groove 17, meaning that the first guide groove 21 passes through the area where the vane groove 17 is located in space. This arrangement allows the liquid refrigerant flowing in the cooling flow path to be partially retained in the first guide groove 21 when it flows through it. The overlap of the projection of the first guide groove 21 and the vane groove 17 allows the vane 18 to be carried to the end face and side face of the vane 18 by the capillary effect generated by the gap between the vane 18 and the vane groove 17, and the pumping effect generated by the movement of the vane 18 during its reciprocating motion. This forms an oil film on each friction surface of the vane 18, thereby effectively lubricating the vane 18 and reducing the frictional loss and motion resistance of the vane 18.

[0037] Since the refrigeration oil itself is part of the cooling medium, while performing the cooling function, the portion of the refrigeration oil retained in the first guide groove 21 automatically lubricates the sliding vane 18, eliminating the need for an additional lubrication structure.

[0038] The exhaust port 12 area of ​​cylinder 1 is the hottest part during compression because a large amount of heat generated when the refrigerant is compressed to a high pressure state in the compression chamber is concentrated on this side. Arranging the cooling tank 16 near the exhaust port 12 allows for direct heat exchange between the cooling medium and the hottest area of ​​cylinder 1, resulting in a large temperature difference and high heat exchange efficiency. As the cooling medium flows within the cooling tank 16, it preferentially carries away heat from the exhaust side, cooling from the source of the most concentrated heat, thus improving the cooling effect.

[0039] Of course, the cooling groove 16 is not limited to the location near the exhaust port 12, but can be laid on the main compression side of the cylinder 1. The so-called main compression side refers to the half-area that the refrigerant in the compression chamber passes through during its movement from the intake side to the exhaust side with reference to the axis of cylinder 1.

[0040] To maximize the heat exchange area within the limited end face area of ​​cylinder 1, the cooling channel 16 employs a zigzag, closely spaced channel structure. This zigzag, closely spaced arrangement means that the cooling channel 16 extends continuously through multiple bends and turns, closely arranged on the end face of cylinder 1 to maximize the total length of the channels. This arrangement significantly extends the flow path of the cooling medium within the cooling channel 16, greatly increasing the contact area with the cylinder 1 end face, resulting in more thorough heat exchange and thus achieving superior cooling performance under the same cylinder 1 end face area and refrigerant flow rate. The specific bends in the zigzag arrangement can be serpentine, spiral, zigzag, or a combination of these forms.

[0041] The depth of the cooling groove 16 needs to balance the heat exchange effect and structural strength. Let the machined depth of the cooling groove 16 be h, and the axial height of the cylinder 1 be H. The deeper the cooling groove 16, the larger the heat exchange area inside the groove, the greater the amount of heat exchanged with the cylinder 1 per unit time, and the better the cooling effect. However, an excessively large depth of the cooling groove 16 will significantly reduce the remaining thickness of the cylinder 1 at this position, lower the structural strength and stiffness of the cylinder 1, which may cause deformation of the cylinder 1 under high-pressure working conditions, and affect the sealing performance of the compression chamber and the reliability of the pump body assembly. After comprehensive consideration, the depth h of the cooling groove 16 is controlled within the range of H / 4 to H / 2, that is, H / 4 < h < H / 2. When h is greater than H / 4, the cooling groove 16 has a sufficient depth to provide a sufficient heat exchange area; when h is less than H / 2, the remaining wall thickness of the cylinder 1 below the cooling groove 16 is not less than H / 2, which is sufficient to ensure the structural strength and deformation resistance of the cylinder 1 under high-pressure compression working conditions.

[0042] The shape of the first flow guide groove 21 and / or the second flow guide groove 22 can be flexibly selected according to processing conditions, flow rate requirements and lubrication requirements, and specifically may be a straight groove structure, an arc groove structure or a broken line groove structure.

[0043] Second Embodiment As shown in Figures 1 to 10 , this embodiment takes the pump body assembly of a dual-cylinder rotary compressor as an example for description. The dual-cylinder pump body assembly comprises two cylinders 1 and three matching members 2, the two cylinders 1 are respectively an upper cylinder and a lower cylinder, the three matching members 2 are respectively a first matching member, a second matching member and a third matching member, the first matching member is an upper flange, the second matching member is a lower flange, and the third matching member is a partition plate. The upper cylinder and the lower cylinder are arranged vertically in the axial direction, and the partition plate is disposed between the upper cylinder and the lower cylinder. The upper surface of the lower flange is attached to the first end face of the lower cylinder (i.e., the lower end face of the lower cylinder), the lower surface of the partition plate is attached to the second end face of the lower cylinder (i.e., the upper end face of the lower cylinder), the upper surface of the partition plate is attached to the first end face of the upper cylinder (i.e., the lower end face of the upper cylinder), and the lower surface of the upper flange is attached to the second end face of the upper cylinder (i.e., the upper end face of the upper cylinder). Accordingly, the pump body assembly is a stacked structure of the lower flange, the lower cylinder, the partition plate, the upper cylinder and the upper flange in sequence from bottom to top. Each of the upper cylinder and the lower cylinder is machined with an inlet flow hole 13, a flow guide hole 15, a return flow hole 14 and a cooling groove 16. The upper surface of the lower flange and the upper surface of the partition plate are respectively machined with the first flow guide groove 21, and the lower surface of the partition plate and the lower surface of the upper flange are respectively machined with the second flow guide groove 22.

[0044] The inlet hole 13 on the lower cylinder connects its intake hole 11 to the first guide groove 21 on the upper surface of the lower flange. The first guide groove 21 on the upper surface of the lower flange connects the inlet hole 13 and the guide hole 15 of the lower cylinder. The guide hole 15 connects the first guide groove 21 to the inlet end 161 of the cooling groove on the upper end face of the lower cylinder. The second guide groove 22 on the lower surface of the partition connects the outlet end 162 of the cooling groove of the lower cylinder to the return hole 14 of the lower cylinder. The return hole 14 connects the second guide groove 22 to the intake hole 11 of the lower cylinder. Thus, a first closed-loop cooling flow path is formed between the lower cylinder, the lower flange, and the partition.

[0045] The inlet hole 13 on the upper cylinder connects its intake hole 11 to the first guide groove 21 on the upper surface of the partition plate. The first guide groove 21 on the upper surface of the partition plate connects the inlet hole 13 and the guide hole 15 of the upper cylinder. The guide hole 15 connects the first guide groove 21 to the inlet end 161 of the cooling groove on the upper end face of the upper cylinder. The second guide groove 22 on the lower surface of the upper flange connects the outlet end 162 of the cooling groove of the upper cylinder to the return hole 14 of the upper cylinder. The return hole 14 connects the second guide groove 22 to the intake hole 11 of the upper cylinder. Thus, a second closed-loop cooling flow path is formed between the upper cylinder, the partition plate, and the upper flange.

[0046] It is worth noting that the baffle plays a dual role in the twin-cylinder structure: its upper surface serves as a mating component for the lower surface of the upper cylinder (designed with a first guide groove 21), and its lower surface serves as a mating component for the upper surface of the lower cylinder (designed with a second guide groove 22). A single component serves both upper and lower cooling flow paths, achieving a highly compact structure.

[0047] In the dual-cylinder pump assembly, the spatial positions of the first guide groove 21 on the upper surface of the partition plate and the upper surface of the lower flange partially overlap with the slide grooves 17 of the upper and lower cylinders on the end face projection, so that the slides 18 of the two cylinders 1 can obtain the lubrication of the refrigerant oil retained in the first guide groove 21 through capillary action and the movement of the slides 18, and the lubrication effect of the slides 18 of the two cylinders is achieved simultaneously.

[0048] The technical performance of the dual-cylinder pump assembly is consistent with that of the single-cylinder pump assembly: the entire cooling flow path is fully integrated within the cylinder 1, flange, and baffle of the pump assembly, without relying on external piping and without increasing the volume of the compressor and air conditioning system; the cooling medium is taken from the mixture of refrigerant and refrigeration oil normally supplied by the distributor; after heat exchange, the refrigerant flows back to the suction port 11 to participate in compression, with no external loss. In addition, the baffle in the dual-cylinder structure realizes the reuse of the cooling function of the upper and lower cylinders, and the two guide grooves on one baffle serve the cooling circuits of the two cylinders 1 respectively, further demonstrating the advantage of compact structure.

[0049] It should be noted that the technical solution of this invention is not limited to single-cylinder and double-cylinder compressors. The technical concept of this invention can also be applied to multi-cylinder rotary compressors with three or more cylinders 1. In the multi-cylinder structure, partitions are respectively provided between adjacent cylinders 1. Each cylinder 1, through the partitions at both ends and / or the guide grooves on the flanges, along with its own inlet hole 13, guide hole 15, return hole 14, and cooling groove 16, forms its own independent internal closed-loop cooling flow path. The cooling flow path of each cylinder 1 operates independently without interference, ensuring that while increasing the exhaust volume, each cylinder 1 achieves the same cooling effect.

[0050] In some embodiments, the present invention also provides a compressor, which includes a pump assembly according to any of the foregoing embodiments. Specifically, the compressor is a rotary compressor, and a motor and a pump assembly are installed inside its housing. The crankshaft of the pump assembly is drivenly connected to the rotor of the motor. A distributor is fixed outside the compressor housing, and its output end is connected to the suction port 11 of the cylinder 1 in the pump assembly through a suction pipe.

[0051] When the compressor is working, the motor drives the crankshaft to rotate, causing the rollers to rotate eccentrically within the compression chamber of cylinder 1, compressing the refrigerant that enters the compression chamber through the suction port 11. The compressed, high-temperature, high-pressure refrigerant is then discharged through the exhaust port 12. Simultaneously, the distributor continuously supplies low-temperature gaseous refrigerant to the suction port 11. The liquid refrigerant and refrigerant oil mixed in with it circulate and exchange heat within the pump assembly through the aforementioned internal closed-loop cooling flow path, continuously removing the heat generated during compression. Because the entire cooling flow path is located entirely within the pump assembly, the compressor's external volume and interfaces are completely identical to those of a conventional compressor without a cooling structure. No additional external piping, connectors, or installation space is required for the cooling function, and no additional requirements are placed on the piping design of the external air conditioning system.

[0052] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A pump body assembly, characterized in that, include: A cylinder, wherein the cylinder is provided with an air intake port and an air exhaust port; A mating component, which is fitted to the end face of the cylinder, wherein the mating component is a flange or a partition; The cylinder is provided with an inlet hole, a return hole and a guide hole extending along its axial direction, and the inlet hole and the return hole are both connected to the intake hole; The cylinder has a cooling groove on its end face, and the inlet end of the cooling groove is connected to the guide hole. The fitting part that fits with the first end face of the cylinder has a first guide groove, and the fitting part that fits with the second end face of the cylinder has a second guide groove. The first guide groove connects the inlet hole and the guide hole, and the second guide groove connects the outlet end of the cooling groove and the return hole.

2. The pump body assembly according to claim 1, characterized in that, The inlet end of the inlet hole is connected to the step of the intake hole, and the outlet end of the inlet hole extends to the first end face of the cylinder; the outlet end of the return hole is connected to the intake hole, and the inlet end of the return hole extends to the second end face of the cylinder; the guide hole penetrates through the first end face and the second end face of the cylinder.

3. A pump body assembly according to claim 2, characterized in that, The first guide channel is disposed on the mating surface of the mating part that is in contact with the first end face of the cylinder. One end of the first guide channel is axially connected to the outlet end of the inlet hole, and the other end of the first guide channel is axially connected to one end of the guide hole. The second guide channel is disposed on the mating surface of the mating part that is in contact with the second end face of the cylinder. One end of the second guide channel is axially connected to the outlet end of the cooling tank, and the other end of the second guide channel is axially connected to the inlet end of the return hole.

4. A pump body assembly according to claim 1, characterized in that, The projection of the first guide groove on the cylinder end face overlaps with the sliding vane groove of the cylinder.

5. A pump body assembly according to claim 1, characterized in that, The cooling tank is located on the side near the exhaust port.

6. A pump body assembly according to claim 1, characterized in that, The cooling troughs have a tortuous, densely arranged channel structure.

7. A pump body assembly according to claim 6, characterized in that, The depth h of the cooling groove and the axial height H of the cylinder satisfy: H / 4 <h<H / 2。 8. A pump body assembly according to claim 1, characterized in that, The first guide channel has a straight channel structure, an arc channel structure, or a broken channel structure.

9. A pump body assembly according to claim 1, characterized in that, The cylinder may be one, two, or more.

10. A pump body assembly according to claim 9, characterized in that, The cylinder is provided in two parts, namely an upper cylinder and a lower cylinder. There are three mating parts, namely a first mating part, a second mating part, and a third mating part. The first mating part is an upper flange, the second mating part is a lower flange, and the third mating part is a partition plate. The partition plate is located between the upper cylinder and the lower cylinder. The first end face of the upper cylinder is in contact with the upper surface of the lower flange, the second end face of the upper cylinder is in contact with the lower surface of the partition plate, the first end face of the lower cylinder is in contact with the upper surface of the partition plate, and the second end face of the lower cylinder is in contact with the lower surface of the upper flange. The upper surface of the partition plate and the upper surface of the lower flange are provided with the first guide groove, and the lower surface of the partition plate and the lower surface of the upper flange are provided with the second guide groove.

11. A compressor, characterized in that, Includes the pump body assembly as described in any one of claims 1 to 10.

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