Rotary compressor pump body, compressor and air conditioner

Abstract

The present application provides a rotary compressor pump body, a compressor, and an air conditioner. The rotary compressor pump body includes: a first cylinder (1) and a second cylinder (2), the first cylinder (1) being provided with a first gas suction port (3), a first gas discharge port (4), and a second gas discharge port (5), and the second cylinder (2) being provided with a second gas suction port (6) and a third gas discharge port (7). The first cylinder (1) compresses a gas drawn in from the first gas suction port (3), the first gas discharge port (4) and the second gas discharge port (5) are disposed at different positions on the first cylinder (1), the first gas discharge port (4) is in communication with the second gas suction port (6) of the second cylinder (2), so that the gas discharged from the first gas discharge port (4) enters the second cylinder (2) through the second gas suction port (6) for compression, thereby forming a secondary compression, the gas compressed in the first cylinder (1) is discharged through the second gas discharge port (5) and mixed with the gas compressed in the second cylinder (2) and discharged through the third gas discharge port (7). In the present application, problems of high discharge temperature and low energy efficiency of the compressor may be simultaneously solved, thereby improving energy efficiency of the compressor and reducing discharge temperature.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese Patent Application No. 202311165169.8, filed with the China National Intellectual Property Administration on September 11, 2023, and titled "ROTARY COMPRESSOR PUMP BODY, COMPRESSOR AND AIR CONDITIONER". The disclosure of the aforementioned application is hereby incorporated by reference in its entireties.TECHNICAL FIELD

[0002] The present application relates to the field of compressor technologies, and in particular, to a rotary compressor pump body, a compressor and an air conditioner.BACKGROUND

[0003] Rotary compressors are commonly categorized into a single-stage compressor and a double-stage compressor based on different compression methods. Among them, when the single-stage compressor operates in a severe working condition, there is a problem of excessively high discharge temperature affecting reliability, and a double-stage compressor is capable of improving this situation and is therefore widely used in severe working condition. However, when the double-stage compressor operates in a common working condition, there is a problem of over-compression leading to low energy efficiency.

[0004] Since a compressor in the related art fail to simultaneously solve technical problems such as excessively high discharge temperature and low energy efficiency, the present application has researched and designed a rotary compressor pump body, a compressor and an air conditioner.SUMMARY

[0005] Therefore, a technical problem to be solved by the present application is to overcome a defect in the related art where a compressor fail to simultaneously solve problems of excessively high discharge temperature and low energy efficiency, thereby providing a rotary compressor pump body, a compressor and an air conditioner.

[0006] To solve the above problems, the present application proposes a rotary compressor pump body, which includes: a first cylinder and a second cylinder, the first cylinder being provided with a first gas suction port, a first gas discharge port, and a second gas discharge port, and the second cylinder being provided with a second gas suction port and a third gas discharge port, where the first cylinder compresses a gas drawn in from the first gas suction port, the first gas discharge port and the second gas discharge port are disposed at different positions on the first cylinder, the first gas discharge port is in communication with the second gas suction port of the second cylinder, so that the gas discharged from the first gas discharge port enters the second cylinder through the second gas suction port for compression, thereby forming a secondary compression, the gas compressed in the first cylinder is directly discharged through the second gas discharge port and mixed with the gas compressed in the second cylinder and discharged through the third gas discharge port.

[0007] In some embodiments, a gas pressure at the first gas discharge port is less than a gas pressure at the second gas discharge port; and / or, the first gas discharge port is a groove structure provided on an axial end face of the first cylinder, and the second gas discharge port is a groove structure provided on another axial end face of the first cylinder.

[0008] In some embodiments, the rotor compressor pump body also includes a first vane and a roller, among them, the first cylinder is provided with a first vane slot, the first vane is at least partially inserted into the first vane slot, the roller is disposed in a hollow inner cavity of the first cylinder, the first vane and the roller can divide the hollow inner cavity of the first cylinder into a gas suction chamber and a compressing chamber, the first gas suction port is in communication with the gas suction chamber, the first gas discharge port and the second gas discharge port are in communication with the compressing chamber, the second gas discharge port is disposed closer to the first vane slot relative to the first gas discharge port, and as the roller moves, a portion of gas in the compressing chamber is firstly discharged from the first gas discharge port, and a portion or all of a remaining gas in the compressing chamber is further compressed in the compressing chamber and discharged from the second gas discharge port.

[0009] In some embodiments, in an axial projection plane of the rotary compressor pump body, a center line of the first vane slot passes through a center of the first cylinder and forms a first dividing line, the first gas suction port is provided on the first cylinder and located on a side of the first dividing line, the first gas discharge port and the second gas discharge port are provided on the first cylinder and located on another side of the first dividing line, a second dividing line is defined as passing through the center of the first cylinder and being perpendicular to the first dividing line, the first gas discharge port is located on a side of the second dividing line away from the first vane slot, and the second gas discharge port is located on a side of the second dividing line close to the first vane slot.

[0010] In some embodiments, in the axial projection plane of the rotary compressor pump body, each of the first gas discharge port and the second gas discharge port is configured as a crescent groove structure.

[0011] In some embodiments, the rotor compressor pump body also includes a first flange, where the first flange is disposed on an axial side of the first cylinder away from the second cylinder, so that the first gas discharge port is disposed towards a side of the second cylinder, and the second gas discharge port is disposed towards a side of the first flange; and the first flange is provided with a first exhaust port along an axial direction of the first flange, and the first exhaust port is disposed opposite to and communicates with the second gas discharge port of the first cylinder along the axial direction of the first flange, so that the gas discharged from the first cylinder through the second gas discharge port is discharged through the first exhaust port of the first flange.

[0012] In some embodiments, the rotor compressor pump body also includes a partition plate disposed between the first cylinder and the second cylinder along the axial direction of the rotor compressor pump body, among them, the partition plate is provided with a second exhaust port and a middle chamber, the first gas discharge port is in communication with the middle chamber through the second exhaust port, the middle chamber is also in communication with the second gas suction port of the second cylinder; the first cylinder is further provided with an air replenishment passage, the air replenishment passage is in communication with an external air supply, and the air replenishment passage is in communication with the middle chamber, so as to supply air to the second cylinder; and the first cylinder is also provided with the air replenishment passage, the partition plate is also provided with an air replenishment port, and the air replenishment port is connected between the air replenishment passage and the middle chamber, so as to supply air to the second cylinder.

[0013] In some embodiments, the rotor compressor pump body also includes a second flange and a silencer, among them, the second flange is disposed on an axial end face of the second cylinder away from the partition plate, the second flange is provided with a third exhaust port, and the third exhaust port is disposed opposite to and communicates with the third gas discharge port of the second cylinder, and the silencer is mounted to cover on an axial side of the second flange away from the second cylinder, an exhaust chamber is formed between the silencer and the second flange, and the exhaust chamber is in communication with the third exhaust port.

[0014] In some embodiments, a first flow-through hole is provided through the first flange along the axial direction of the first flange, a second flow-through hole is provided through the first cylinder along the axial direction of the first cylinder, a third flow-through hole is provided through the partition plate along the axial direction of the partition plate, a fourth flow-through hole is provided through the second cylinder along the axial direction of the second cylinder, and a fifth flow-through hole is provided through the second flange along the axial direction of the second flange; the first flow-through hole, the second flow-through hole, the third flow-through hole, the fourth flow-through hole, and the fifth flow-through hole are all axially opposite to each other and communicate in sequence, and the fifth flow-through hole is in communication with the exhaust chamber, so that the gas compressed by the second cylinder is discharged through the exhaust chamber, the fifth flow-through hole, the fourth flow-through hole, the third flow-through hole, the second flow-through hole, and the first flow-through hole in sequence.

[0015] In some embodiments, the rotor compressor pump body also includes a casing, where the first cylinder and the second cylinder are disposed inside the casing, the gas compressed in the first cylinder is discharged into the casing through the second gas discharge port, the gas compressed in the second cylinder is discharged into the casing through the third gas discharge port, and the gas compressed by the first cylinder and the gas compressed by the second cylinder are mixed in the casing.

[0016] The present application also provides a compressor, which includes the aforementioned rotary compressor pump body.

[0017] The present application also provides an air conditioner, which includes the aforementioned compressor.

[0018] The rotary compressor pump body, the compressor, and the air conditioner provided by the present application have following beneficial effects:

[0019] The present application provides two or more cylinders, and particularly provides two gas discharge ports on a first cylinder, so that a gas discharged from a first gas discharge port in the first cylinder enters a second cylinder for compression, thereby forming a secondary compression, and a second gas discharge port provided on the first cylinder allows a portion of the gas to form a single-stage compression in the first cylinder and be discharged from the second gas discharge port, thereby enabling a pump body to simultaneously operate a single-stage compression method and a double-stage compression method. Among them, a single-stage operation may compensate for a problem of over-compression, and a double-stage operation may decompose a pressure ratio to reduce a discharge temperature. As a result, a novel structure that comprehensively addresses demands of different working conditions and maintains high efficiency and reliability is obtained, and the novel structure is capable of simultaneously solving problems of excessively high exhaust temperature and low energy efficiency of a compressor, thereby improving energy efficiency of the compressor and reducing the exhaust temperature. By combining advantages of the single-stage compression and the double-stage compression, the present application comprehensively addresses the demands of the different working conditions, and thus improving overall energy efficiency.BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 is a longitudinal sectional view of a rotary compressor pump body provided by the present application. FIG. 2 is a top view of a first cylinder of a rotary compressor pump body provided by the present application. FIG. 3 is a schematic diagram of a compression process in a medium-pressure section of a first cylinder of a rotary compressor pump body provided by the present application. FIG. 4 is a schematic diagram of a compression process in a high-pressure section of a first cylinder of a rotary compressor pump body of the present application. FIG. 5 is a top view of a first flange of a rotary compressor pump body provided by the present application. FIG. 6 is a top view of a partition plate of a rotary compressor pump body provided by the present application. FIG. 7 is a longitudinal sectional view (a medium-pressure section flow path diagram) of a rotary compressor pump body provided by the present application. FIG. 8 is a longitudinal sectional view (a high-pressure section flow path diagram) of a rotary compressor pump body provided by the present application. FIG. 9 is a comparison curve diagram of the energy efficiency of the rotary compressor pump body of the present application with existing single-stage compression and double-stage compression. FIG. 10 is a comparison curve diagram of a discharge temperature between a rotary compressor pump body provided by the present application and existing single-stage compression and double-stage compression. FIG. 11 is a schematic diagram of a single-stage compression. FIG. 12 is a schematic diagram of a double-stage compression.

[0021] Reference numerals: 1. first cylinder; 2. second cylinder; 3. first gas suction port; 4. first gas discharge port; 5. second gas discharge port; 6. second gas suction port; 7. third gas discharge port; 8. first vane; 9. first vane slot; 10. roller; 11. first dividing line; 12. second dividing line; 13. first flange; 14. first exhaust port; 15. partition plate; 16. middle chamber; 17. second flange; 18. silencer; 19. third exhaust port; 20. exhaust chamber; 21. first flow-through hole; 22. second flow-through hole; 23. third flow-through hole; 24. fourth flow-through hole; 25. fifth flow-through hole; 26. casing; 27. second exhaust port; 28. roller two; 29. crankshaft; 30. air replenishment passage; 31. air replenishment port.DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Technical solutions in the embodiments of the present application will be clearly and completely described below with reference to drawings in the embodiments of the present application. Apparently, the described embodiments are only a portion of the embodiments of the present application, rather than all the embodiments. A following description of at least an exemplary embodiment is merely illustrative and is not construed as a limitation on the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those with ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0023] It should be noted that terms used herein are merely for describing specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, unless a context clearly indicates otherwise, a singular form is also intended to include a plural form. In addition, it should be understood that when terms "comprise" and / or "include" are used in this specification, they indicate a presence of a feature, a step, an operation, a device, a component, and / or their combinations.

[0024] Unless specifically stated otherwise, a relative arrangement, a numerical expression, and a numerical value of the component and the step described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for ease of description, dimensions of various portions shown in the drawings are not drawn according to actual proportional relationships. Technologies, methods, and devices known to those with ordinary skill in the relevant art may not be discussed in detail, but in an appropriate case, the technologies, the methods, and the devices should be considered as a portion of an authorized specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters denote similar items in following drawings, and therefore, once an item is defined in a drawing, it does not need to be further discussed in subsequent drawings.

[0025] In the description of the present application, it should be understood that directional terms such as "front, rear, upper, lower, left, right," "lateral, vertical, perpendicular, horizontal," and "top, bottom" refer to orientations or positional relationships based on orientations or positional relationships shown in the drawings. These terms are only used for ease of description and simplification of the description of the present application. In an absence of a contrary description, these directional terms do not indicate or imply that devices or elements must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the scope of the present application. Directional terms "inside, outside" refer to inside and outside relative to a contour of each component.

[0026] For ease of description, spatial relative terms such as "on," "above," "upper surface," and "over," and the like may be used herein to describe a spatial positional relationship of a device or a feature relative to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to an orientation described in the drawings. For example, if a device in the drawing is inverted, the device described as "above" or "over" other devices or structures would thereafter be oriented as "below" or "beneath" other devices or structures. Thus, exemplary terms "above" may include both "above" and "below" orientations. The device may also be oriented in other different ways (for example, rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein should be interpreted accordingly.

[0027] In addition, it should be noted that terms such as "first," "second," and the like, are used for defining components is merely for convenience of distinguishing between corresponding components. Unless otherwise stated, these terms do not have special meanings and therefore should not be understood as a limitation on the scope of the present application.

[0028] FIG. 11 shows a schematic diagram of a single-stage compression. After a low-temperature and low-pressure refrigerant from an evaporator is drawn into a compressor, the low-temperature and low-pressure refrigerant is compressed to obtain a high-temperature high-pressure refrigerant. The high-temperature high-pressure refrigerant enters a condenser for heat exchange, then passes through a throttling device for pressure reduction, and re-enters the evaporator for the heat exchange to obtain the low-temperature and low-pressure refrigerant, thus completing a cycle.

[0029] FIG. 12 shows a schematic diagram of a double-stage compression. Compared with the single-stage compression, a system adds a flash evaporator and a throttling device. The low-temperature and low-pressure refrigerant from the evaporator is firstly drawn into a low-pressure stage compression section of the compressor to obtain a medium-pressure refrigerant. The medium-pressure refrigerant is mixed with a medium-pressure refrigerant from the flash evaporator and then drawn into a high-pressure stage cylinder, where it is compressed again to become a high-temperature high-pressure refrigerant. The high-temperature high-pressure refrigerant enters the condenser for the heat exchange, then enters a first-stage throttling device for the pressure reduction, and then enters the flash evaporator, a saturated gas in the flash evaporator enters a medium-pressure chamber of the compressor, and a saturated liquid continues to be depressurized through a secondary throttling device. Finally, after the heat exchange in the evaporator, the low-temperature and low-pressure refrigerant is obtained, thus completing this two-stage cycle.

[0030] Moving components of a rolling rotary compressor only include a crankshaft, a roller, and a vane. A gas is directly discharged into a casing to firstly cool down a motor, and then discharged out of the casing. Inside a cylindrical cylinder, a cylindrical roller is installed. The roller is rotated by the crankshaft within a cylinder chamber, a rotation center of the roller coincides with a center of the cylinder, but an outer surface of the roller is asymmetrical relative to a rotation center line of the roller. A vane that may slide back and forth is installed at a midpoint of an upper section of the cylinder, and the vane moves back and forth under an action of a spring. An arc-shaped end of the vane is always in contact with the outer surface of the roller. Therefore, a sealed volume is formed by the vane, an inner surface of the cylinder, the outer surface of the roller, upper and lower flanges on upper and lower sides of the cylinder, and the sealed volume varies with a rotation position of the roller.

[0031] For a double-cylinder compressor, when it operates in the single-stage compression, the first cylinder 1 and the second cylinder 2 are in a parallel relationship. Compressed gas from the first cylinder 1 and the second cylinder 2 discharges directly out of a pump body after completing compression, respectively. For a relatively harsh working condition, when a pressure ratio of a high pressure and a low pressure is relatively large, discharge temperature tends to become relatively high, thereby affecting reliability of the compressor.

[0032] To ensure that the compressor is capable of operating reliably in the severe working condition, a double-stage compression method is adopted. In this case, the first cylinder 1 and the second cylinder 2 are in a series relationship. After the first cylinder 1 completes a first compression, the resulting medium-pressure refrigerant is discharged into the medium-pressure chamber of the pump body. A medium-pressure air replenishment from a flash evaporator of the system enters the medium-pressure chamber and mixes with a medium-pressure refrigerant of the first-stage discharge, which serves to lower temperature. Subsequently, the second cylinder 2 draws in a gas from the medium-pressure chamber, and a high-pressure refrigerant is obtained after completing a secondary compression. However, for a low-load condition with a small pressure ratio, unnecessary decomposition of the pressure ratio will cause over-compression, thereby reducing compressor efficiency.

[0033] In view of respective advantages and disadvantages of the above single-stage compression and double-stage compression, the present application designs a novel compressor pump body structure.

[0034] As shown in FIG. 1 to FIG. 10, the present application provides a rotary compressor pump body, which includes: a first cylinder 1 and a second cylinder 2, the first cylinder 1 being provided with a first gas suction port 3, a first gas discharge port 4, and a second gas discharge port 5, and the second cylinder 2 being provided with a second gas suction port 6 and a third gas discharge port 7, among them, the first cylinder 1 compresses a gas drawn in from the first gas suction port 3, the first gas discharge port 4 and the second gas discharge port 5 are disposed at different positions on the first cylinder 1, the first gas discharge port 4 is in communication with the second gas suction port 6 of the second cylinder 2, so that the gas discharged from the first gas discharge port 4 enters the second cylinder 2 through the second gas suction port 6 for compression, thereby forming a secondary compression, the gas compressed in the first cylinder 1 is discharged through the second gas discharge port 5 and mixed with the gas compressed in the second cylinder 2 and discharged through the third gas discharge port 7.

[0035] The present application provides two or more cylinders, and particularly provides two gas discharge ports on the first cylinder 1, so that the gas discharged from the first gas discharge port 4 in the first cylinder 1 enters the second cylinder 2 for compression, thereby forming the secondary compression, and a portion of the gas forms a single-stage compression in the first cylinder 1 through the second gas discharge port 5 provided on the first cylinder 1 and is discharged from the second gas discharge port 5, thereby enabling the pump body to simultaneously operate a single-stage compression method and a double-stage compression method. Among them, a single-stage operation may compensate for a problem of the over-compression, and a double-stage operation may decompose a pressure ratio to reduce a discharge temperature. As a result, a novel structure that comprehensively addresses demands of different working conditions and maintains high efficiency and reliability is obtained, and the novel structure is capable of simultaneously solving problems of excessively high discharge temperature and low energy efficiency of the compressor, thereby improving energy efficiency of the compressor and reducing the discharge temperature. By combining advantages of the single-stage compression and the double-stage compression, the present application comprehensively addresses the demands of the different working conditions, and thus improving overall energy efficiency.

[0036] FIG. 1 shows an assembly diagram of a pump body structure provided by the present application. A first flange 13 (an upper flange) is located above the first cylinder 1, and a partition plate 15 is located below the first cylinder 1. The partition plate includes a first partition plate and a second partition plate, the first partition plate has a hollowed-out structure, and forms a middle chamber with the second partition plate. The second partition plate is located above the second cylinder 2, and a second flange 17 (a lower flange) is located below the second cylinder 2. A silencer 18 is disposed below the second flange 17, and the silencer 18 not only provides a certain level of noise reduction effect, but also isolates exhaust of the second cylinder 2 from communicating with an oil pool. In the preset application, the first cylinder 1 is a low-pressure stage cylinder, the second cylinder 2 is a high-pressure stage cylinder, a displacement of the first cylinder1 is greater than a displacement of the second cylinder 2 (the second cylinder 2 is a second-stage cylinder, that is, a gas is further compressed by the second cylinder 2 after completing compression in the first cylinder 1, and thus based on pressure change, the displacement of the second cylinder 2 needs to be less than the displacement of the first cylinder 1).

[0037] Among them, the first cylinder 1 is shown in FIG. 2. The first cylinder 1 has two crescent-shaped grooves along its circumferential direction, and the two crescent-shaped grooves are located on upper and lower sides of the first cylinder 1. Compared to a conventional dual-exhaust cylinder, the two crescent-shaped grooves in the present application are positioned at different angular positions around its circumference. Among them, a first crescent-shaped groove (that is, the first gas discharge port 4) corresponds to a first exhaust port 14 disposed on the upper flange, and a second crescent-shaped groove (that is, the second gas discharge port 5) corresponds to a second exhaust port 27 disposed on the partition plate 15. As shown in FIG. 3, when starting work, the first cylinder 1 draws in a low-pressure refrigerant through a suction port. Based on characteristics of the double-stage compression method, a pressure in the medium-pressure chamber may be controlled by an air replenishment port located on the partition plate 15. After a middle pressure is set, during a compression process in the first cylinder 1, when a pressure in a compressing chamber reaches a pressure in the middle chamber, the first crescent-shaped groove (the first gas discharge port 4) is firstly used for discharging until a position of the roller 10 exceeds the first gas discharge port 4, at which point this compression section is completed. In this case, the discharged refrigerant is at a medium pressure. Then the roller continues to rotate and continues to compress the refrigerant. As shown in FIG. 4, when a remaining refrigerant reaches a high pressure given by a working condition, the second crescent-shaped groove (the second gas discharge port 5)is used for discharging, in this case, refrigerant discharged from this compression section is at a high pressure. By adjusting a relative position of the first gas discharge port 4 and the second gas discharge port 5, displacement ratios of a portion of the first cylinder 1 configured for the single-stage compression and a portion of the first cylinder 1 configured for the double-stage compression may be modified. Among them, a ratio of a displacement of the portion of the first cylinder 1 configured for the double-stage compression to a displacement of a high-pressure cylinder is manifested as a difference in volume ratios, thereby representing different volumetric efficiency performances under different application conditions.

[0038] As shown in FIG. 9, as an operating pressure ratio continues to increase, energy efficiency of the single-stage compression and the double-stage compression will decrease. There exists a certain pressure ratio value such that when an operating pressure ratio is below this limit, the single-stage compression is optimal; when the operating pressure ratio is above this limit, the double-stage compression is optimal. A compression method of the present application combines the single-stage compression and the double-stage compression, and its energy efficiency also lies between the energy efficiency of the single-stage compression and the energy efficiency of the double-stage compression, thereby providing an advantage in comprehensive energy efficiency in the present application. As shown in FIG. 10, the double-stage compression is significantly superior to the single-stage compression in terms of the discharge temperature. Based on the present application, there is a process during the compression where the discharge from a single-stage compression mixes with a double-stage compression. This results in discharge temperature of the present application lies between a discharge temperature of the single-stage compression and a discharge temperature of the double-stage compression, giving it a broader range of applications compared to single-stage compression.

[0039] Compared to an existing method of disposing two vanes within a same cylinder to achieve two-stage compression, the present application does not add additional vanes in the same cylinder. The discharge chambers corresponding to the two crescent-shaped grooves are different, which allows for an increase in displacement and improved volumetric efficiency. Additionally, this design prevents a coexistence of three different pressures in a cylinder, thereby avoiding gas leakage or reducing a leakage rate.

[0040] In some embodiments, a gas pressure at the first gas discharge port 4 is less than a gas pressure at the second gas discharge port 5; and / or, the first gas discharge port 4 is a groove structure provided on an axial end face of the first cylinder 1, and the second gas discharge port 5 is a groove structure provided on another axial end face of the first cylinder 1.

[0041] This describes a preferred structural form of the first gas discharge port 4 and the second gas discharge port 5 of the first cylinder 1 in the present application. By positioning the first gas discharge port 4 at a location corresponding to a lower pressure compared to the second gas discharge port 5, a gas compressed to a medium pressure in the first cylinder 1 may be discharged through the first gas discharge port 4 to the second cylinder 2 for further compression, thereby forming the secondary compression. However, the gas pressure at the second gas discharge port 5 is greater than the gas pressure at the first gas discharge port 4, a high-pressure gas compressed through the first cylinder 1 to the second gas discharge port 5 is directly discharged into the casing. The high-pressure gas is mixed with the gas discharged from the second cylinder 2 after completing the secondary compression, so that gas pressure values after the single-stage compression and the secondary compression reach a close range, or are not much different, or are equal, thereby effectively avoiding a pressure loss caused by a large pressure difference when two gases are mixed, so that a combined structure of the single-stage compression and the secondary compression of the present application may reduce the discharge temperature, improve the energy efficiency, and also reduce a mixed pressure loss, thereby further improving the energy efficiency. In the present application, the first gas discharge port 4 is further configured as a groove structure on an axial end face of the first cylinder 1, and the second gas discharge port 5 is configured as a groove structure facing another axial end face of the first cylinder 1, so that the gas discharged from the first gas discharge port 4 enters the second cylinder 2 for compression, moreover, the gas from the second gas discharge port 5 is discharged towards another side into the casing. Consequently, distinct medium-pressure discharge and high-pressure discharge are formed on both sides, thereby realizing a combination of the single-stage compression and the double-stage compression.

[0042] In some embodiments, the rotor compressor pump body also includes a first vane 8 and a roller 10. The first cylinder 1 is provided with a first vane slot 9, and the first vane 8 is at least partially inserted into the first vane slot 9. The roller 10 is disposed in a hollow inner cavity of the first cylinder 1, and the first vane 8 and the roller 10 divide the hollow inner cavity of the first cylinder 1 into a gas suction chamber and a compressing chamber. The first gas suction port 3 is in communication with the gas suction chamber, and the first gas discharge port 4 and the second gas discharge port 5 are in communication with the compressing chamber, and the second gas discharge port 5 is disposed closer to the first vane slot 9 relative to the first gas discharge port 4, and as the roller 10 moving, a portion of gas in the compressing chamber is firstly discharged from the first gas discharge port 4, and a portion or all of a remaining gas in the compressing chamber is further compressed in the compressing chamber and discharged from the second gas discharge port 5.

[0043] This describes a preferred structural form of the first cylinder of the compressor in the present application, that is, the first vane 8 and the roller 10 divide the hollow inner cavity of the first cylinder 1 into the gas suction chamber and the compressing chamber. The first gas suction port 3 is in communication with the gas suction chamber to allow the gas suction chamber to draw in a gas through the first gas suction port 3. The first gas discharge port 4 and the second gas discharge port 5 are in communication with the compressing chamber, so that the gas compressed in the compressing chamber is discharged through the first gas discharge port 4 and the second gas discharge port 5, respectively, thereby ensuring that the gas discharged from two discharge ports is a compressed gas with a certain pressure. The second gas discharge port 5 is disposed closer to the first vane slot 8 relative to the first gas discharge port 4, this arrangement allows the roller 10 to travel a longer compression path during its movement, resulting in a smaller final volume of the compressing chamber. Consequently, a discharge pressure at the second gas discharge port 5 is greater than a discharge pressure at the first gas discharge port 4, so that a pressure difference between a gas pressure discharged from the second gas discharge port 5 after the single-stage compression and a gas pressure discharge after the secondary compression is not excessively large, thereby reducing the pressure loss when the gas is mixed after the single-stage compression and the double-stage compression, and further improving the energy efficiency. Moreover, due to specific positioning of the first gas discharge port 4 and the second gas discharge port 5 in the present application, a portion of the gas in the compression chamber may be compressed at an medium pressure, that is, when the roller 10 moves close to the first gas discharge port 4, a portion of the gas with the medium pressure in the compression chamber may be discharged, and when the roller 10 moves close to the second gas discharge port 5, the remaining gas with the high pressure in the compression chamber may be discharged, so that an operation process of the first cylinder 1 (a rotation of the roller 10) is the same as operation processes of conventional cylinders and rollers. A discharge process after the first-stage compression of the double-stage compression and a discharge process of the single-stage compression may be completed during a normal movement of the roller 10, thereby effectively realizing a combination of the single-stage compression and the secondary-stage compression, and addressing the problems of the high discharge temperature and the low energy efficiency.

[0044] In some embodiments, In an axial projection plane of the rotary compressor pump body, a center line of the first vane slot 9 passes through a center of the first cylinder 1 and forms a first dividing line 11, the first gas suction port 3 is provided on the first cylinder 1 and located on a side of the first dividing line 11, the first gas discharge port 4 and the second gas discharge port 5 are provided on the first cylinder 1 and located on another side of the first dividing line 11. A second dividing line 12 is defined as passing through the center of the first cylinder 1 and being perpendicular to the first dividing line 11, the first gas discharge port 4 is located on a side of the second dividing line 12 away from the first vane slot 9, and the second gas discharge port 5 is located on a side of the second dividing line 12 close to the first vane slot 9.

[0045] This describes a further preferred structural form of the first gas discharge port 4 and the second gas discharge port 5 in the present application, that is, the first gas discharge port 4 is located on the side of the second dividing line 12 away from the first vane slot 9, and the second gas discharge port 5 is located on the side of the second dividing line 12 close to the first vane slot 9, so that the first gas discharge port 4 is disposed in an medium-pressure zone of the compressing chamber, and the second gas discharge port 5 is disposed in a high-pressure zone of the compressing chamber, a pressure difference between the first gas discharge port 4 and the second gas discharge port 5 is further created. A gas in the medium-pressure zone is discharged through the first gas discharge port 4 to the second cylinder 2 for the secondary compression, and a gas in the high-pressure zone is discharged through the second gas discharge port 5 to inside of the casing to complete the single-stage compression. This design enables the roller to automatically discharge a portion of the gas with the medium pressure in the compressing chamber when the roller 10 moves to the medium-pressure zone, and to automatically discharge the gas with the high pressure in the compressing chamber when the roller 10 moves to the high-pressure zone, thereby effectively realizing the combination of the single-stage compression and the secondary compression, and addressing the problems of the high discharge temperature and the low energy efficiency.

[0046] In some embodiments, In an axial projection plane of the rotary compressor pump body, the first gas discharge port 4 and the second gas discharge port 5 are crescent-shaped groove structures. This is a preferred structural form of the first gas discharge port 4 and the second gas discharge port 5 of the present application. The first gas discharge port 4 and the second gas discharge port 5 are set as crescent-shaped grooves may facilitate processing and allow a gas in an inner cavity of a cylinder to discharge.

[0047] A working chamber in the first cylinder 1 of the present application is divided into two parts, a part performs the first-stage compression and the other part performs the secondary compression. A middle chamber is disposed inside the pump body (that is, the medium-pressure chamber), and the middle chamber is composed of two partition plates. The second cylinder 2 is served as the high-pressure cylinder, and draws in a gas from the medium-pressure chamber.

[0048] The crescent-shaped grooves are respectively provided on both sides of the first cylinder 1, and these two crescent-shaped grooves are located at different positions on the circumference. Among them, the first crescent-shaped groove (the first gas discharge port 4) corresponds to the second exhaust port 27, and the second crescent-shaped groove (the second gas discharge port 5) corresponds to the first exhaust port 14. The second exhaust port 27 is in communication with the medium-pressure chamber of the pump body.

[0049] The medium-pressure refrigerant obtained from a portion of the first cylinder 1 performing the first-stage compression enters the medium-pressure chamber. The high-pressure refrigerant obtained from a portion of compression of the first cylinder 1 performing the single-stage compression is discharged from the pump body through the first exhaust port 14. The second cylinder 2 draws in the medium-pressure refrigerant from the medium-pressure chamber to perform the secondary compression, and the medium-pressure refrigerant is then discharged from the pump body through a third exhaust port 19. Finally, the refrigerant from the first exhaust port 14 and the refrigerant from the third exhaust port 19 are mixed outside the pump body to achieve temperature neutralization.

[0050] In some embodiments, the rotor compressor pump body also includes a first flange 13. The first flange 13 is disposed on an axial side of the first cylinder 1 away from the second cylinder 2, so that the first gas discharge port 4 is disposed towards a side of the second cylinder 2, and the second gas discharge port 5 is disposed towards a side of the first flange 13; and the first flange 13 is provided with a first exhaust port 14 along an axial direction of the first flange 13, and the first exhaust port 14 is disposed opposite to and communicates with the second gas discharge port 5 of the first cylinder 1 along the axial direction of the first flange 13, so that the gas discharged from the first cylinder 1 through the second gas discharge port 5 is discharged through the first exhaust port 14 of the first flange 13.

[0051] In the present application, it is preferable to use the first flange to orient the second gas discharge port of the first cylinder towards the first flange. Through the first discharge port on the first cylinder, a portion of the gas after the single-stage compression in the first cylinder may be discharged into the casing through a first exhaust hole on the first flange, thereby achieving effects of the single-stage compression and the discharge.

[0052] In some embodiments, the rotor compressor pump body also includes a partition plate 15 disposed between the first cylinder 1 and the second cylinder 2 along the axial direction of the rotary compressor pump body, where the partition plate 15 is provided with the second exhaust port 27 and a middle chamber 16, the first gas discharge port 4 is in communication with the middle chamber 16 through the second exhaust port 27, the middle chamber 16 is also in communication with the second gas suction port 6 of the second cylinder 2; and the first cylinder 1 is also provided with an air replenishment passage 30, the partition plate 15 is also provided with an air replenishment port 31, the air replenishment passage 30 is in communication with an external air supply, and the air replenishment port 31 is connected between the air replenishment passage 30 and the middle chamber 16, so as to supply air to the second cylinder 2.

[0053] The present application further includes the partition plate 15, which is disposed between the first cylinder 1 and the second cylinder 2. The partition plate 15 is configured to isolate, seal, and support the compressing chamber of two cylinders. The partition plate 15 of the present application is also provided with the second exhaust port 27 and the middle chamber 16. Through alignment of the second exhaust port 27 and the first gas discharge port 4, a gas compressed to the medium pressure in the first cylinder 1 may be directed into the middle chamber 16 for buffering. The middle chamber 16 is then in communication with the second gas suction port 6 of the second cylinder 2, allowing a medium-pressure gas to be directed to the second cylinder 2, thereby effectively achieving an effect of the secondary compression. In the present application, the first cylinder 1 is further preferably provided with the air replenishment passage 30, and the partition plate 15 is further preferably provided with the air replenishment port 31, the air replenishment passage and the air replenishment port are connected to the middle chamber, to supply the air to the middle chamber 16 through the air replenishment passage 30 and the air replenishment port 31 when needed, for mixing and buffering, and then the air is directed into the second cylinder 2 to form a medium-pressure air supply for the second cylinder 2, thereby meeting the requirements for enthalpy increase through air replenishment in the secondary compression.

[0054] On the other hand, in view of the medium-pressure refrigerant discharged from the first cylinder 1, as shown in FIG. 7, this portion of refrigerant firstly enters the middle chamber. Based on characteristics of the double-stage compression method, this portion of discharged gas will mix with the medium-pressure refrigerant from the flash evaporator of the system, playing a role in cooling. The suction port of the second cylinder 2 is in communication with the medium-pressure chamber, and thus the second cylinder 2 draws in the medium-pressure refrigerant from the medium-pressure chamber through its suction port. After completing the secondary compression, this portion of compressed refrigerant will be discharged through the third exhaust port 19 and enter a cavity formed by the lower flange and the silencer. Herein, the silencer is configured to reduce aerodynamic noise on the one hand and to isolate high-pressure refrigerant from the oil pool on the other hand. A structure of the present application is provided with an exhaust flow-through hole from top to bottom. In this case, the high-pressure refrigerant in the cavity formed by the lower flange and the silencer is discharged through the exhaust flow-through hole. Compared to a high-pressure discharged refrigerant of the first cylinder 1, the high-pressure refrigerant generated by the secondary compression in the second cylinder 2 has a cooling effect due to mixing with the medium-pressure air supply from the flash evaporator of the system. A temperature of the high-pressure refrigerant will be lower than a temperature of the refrigerant discharged from the high-pressure compression of the first cylinder 1. Finally, these two portions of high-pressure refrigerant are mixed in a casing cavity, thereby achieving an effect of reducing final discharge temperature.

[0055] In some embodiments, the rotor compressor pump body also includes a second flange 17 and a silencer 18. The second flange 17 is disposed on an axial end face of the second cylinder 2 away from the partition plate 15. The second flange 17 is provided with a third exhaust port 19, and the third exhaust port (19) is opposite and communicates with the third gas discharge port 7 of the second cylinder 2. The silencer 18 is mounted to cover an axial side of the second flange 17 away from the second cylinder 2, an exhaust chamber 20 is formed between the silencer 18 and the second flange 17, and the exhaust chamber 20 is in communication with the third exhaust port 19.

[0056] The present application also preferably includes the second flange 17 and the silencer 18, and the exhaust chamber 20 is formed between the silencer 18 and the second flange 17, which may guide the gas after the secondary compression in the second cylinder 2 into the exhaust chamber 20 for buffering, and then the gas is discharged into the casing.

[0057] In some embodiments, a first flow-through hole 21 is provided through the first flange 13 along the axial direction of the first flange 13, the second flow-through hole 22 is provided through the first cylinder 1 along the axial direction of the first cylinder 1, the third flow-through hole 23 is provided through the partition plate 15 along the axial direction of the partition plate 15, the fourth flow-through hole 24 is provided through the second cylinder 2 along the axial direction of the second cylinder 2, and the fifth flow-through hole 25 is provided through the second flange 17 along the axial direction of the second flange 17. The first flow-through hole 21, the second flow-through hole 22, the third flow-through hole 23, the fourth flow-through hole 24, and the fifth flow-through hole 25 are all axially opposite to each other and communicate in sequence. The fifth flow-through hole 25 is in communication with the exhaust chamber 20, so that the gas compressed by the second cylinder 2 is discharged through the exhaust chamber 20, the fifth flow-through hole 25, the fourth flow-through hole 24, the third flow-through hole 23, the second flow-through hole 22, and the first flow-through hole 21 in sequence.

[0058] The present application further preferably utilizes a plurality of flow-through holes disposed on the first flange, the first cylinder, the second cylinder, the partition plate, and the second flange. This configuration allows the gas that has undergone the secondary compression in the exhaust chamber to be discharged into the casing, where the gas mixes with the gas from the single-stage compression, thereby forming a structure combining the single-stage compression and the secondary compression, and addressing the problems of the low energy efficiency and the high discharge temperature.

[0059] In some embodiments, the rotor compressor pump body also includes a casing 26. The first cylinder 1 and the second cylinder 2 are disposed inside the casing 26. The gas compressed in the first cylinder 1 is discharged into the casing 26 through the second gas discharge port 5, and the gas compressed in the second cylinder 2 is discharged into the casing 26 through the third gas discharge port 7. The gas compressed by the first cylinder 1 and the gas compressed by the second cylinder 2 are mixed in the casing 26.

[0060] The present application preferably arranges for the gas after the single-stage compression in the first cylinder to be discharged through the second gas discharge port into the casing, where it mixes with the gas that has undergone the secondary compression in the second cylinder and is discharged into the casing through the third gas discharge port. This arrangement is capable of completing a mixing of gases from the single-stage compression and the secondary compression in the casing, thereby forming a structure combining the single-stage compression and the secondary compression, and addressing the problems of the low energy efficiency and the high discharge temperature.

[0061] The present application also provides a compressor, which includes the aforementioned rotary compressor pump body.

[0062] The present application may solve technical problems that as follows: Due to limitations in the compression ratio and the discharge temperature, the single-stage compression fail to be applied within the severe working condition. A double-stage compressor has a characteristic of decomposing the compression ratio, so that the double-stage compressor operates stably and reliably within the severe working condition. However, when the double-stage compression is applied to a common working condition, there is a problem of the over-compression leading to the low energy efficiency.

[0063] Therefore, the present application provides a novel structure that combines advantages of the double-stage compression and the single-stage compression. The novel structure may consider different application conditions, and thereby solving the problem of the low energy efficiency caused by the over-compression and the problem of the high discharge temperature.

[0064] The present application also provides an air conditioner, which includes the aforementioned compressor.

[0065] The above description is only preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within spirit and principles of the present application shall fall within the protection scope of the present application. The above description is only preferred implementations of the present application. It should be pointed out that for those with ordinary skill in the art, several improvements and modifications may be made without departing from technical principles of the present application, and these improvements and modifications should also be considered within the protection scope of the present application.

Claims

1. A rotary compressor pump body, comprising: a first cylinder (1) and a second cylinder (2), the first cylinder (1) being provided with a first gas suction port (3), a first gas discharge port (4), and a second gas discharge port (5), and the second cylinder (2) being provided with a second gas suction port (6) and a third gas discharge port (7), wherein the first cylinder (1) compresses a gas drawn in from the first gas suction port (3), the first gas discharge port (4) and the second gas discharge port (5) are disposed at different positions on the first cylinder (1), the first gas discharge port (4) is in communication with the second gas suction port (6) of the second cylinder (2), so that the gas discharged from the first gas discharge port (4) enters the second cylinder (2) through the second gas suction port (6) for compression, thereby forming a secondary compression, the gas compressed in the first cylinder (1) is discharged through the second gas discharge port (5) and mixed with the gas compressed in the second cylinder (2) and discharged through the third gas discharge port (7).

2. The rotary compressor pump body according to claim 1, wherein a gas pressure at the first gas discharge port (4) is less than a gas pressure at the second gas discharge port (5), the first gas discharge port (4) is a groove structure provided on an axial end face of the first cylinder (1), and the second gas discharge port (5) is a groove structure provided on another axial end face of the first cylinder (1).

3. The rotary compressor pump body according to claim 1, wherein a gas pressure at the first gas discharge port (4) is less than a gas pressure at the second gas discharge port (5).

4. The rotary compressor pump body according to claim 1, wherein the first gas discharge port (4) is a groove structure provided on an axial end face of the first cylinder (1), and the second gas discharge port (5) is a groove structure provided on another axial end face of the first cylinder (1).

5. The rotary compressor pump body according to any one of claims 2 to 4, further comprising a first vane (8) and a roller (10), wherein the first cylinder (1) is provided with a first vane slot (9), the first vane (8) is at least partially inserted into the first vane slot (9), the roller (10) is disposed in a hollow inner cavity of the first cylinder (1), the first vane (8) and the roller (10) divide the hollow inner cavity of the first cylinder (1) into a gas suction chamber and a compressing chamber, the first gas suction port (3) is in communication with the gas suction chamber, the first gas discharge port (4) and the second gas discharge port (5) are in communication with the compressing chamber, the second gas discharge port (5) is disposed closer to the first vane slot (9) relative to the first gas discharge port (4), and as the roller (10) moves, a portion of gas in the compressing chamber is firstly discharged from the first gas discharge port (4), and a portion or all of a remaining gas in the compressing chamber is further compressed in the compressing chamber and discharged from the second gas discharge port (5).

6. The rotary compressor pump body according to claim 5, wherein in an axial projection plane of the rotary compressor pump body, a center line of the first vane slot (9) passes through a center of the first cylinder (1) and forms a first dividing line (11), the first gas suction port (3) is provided on the first cylinder (1) and located on a side of the first dividing line (11), the first gas discharge port (4) and the second gas discharge port (5) are provided on the first cylinder (1) and located on another side of the first dividing line (11), a second dividing line (12) is defined as passing through the center of the first cylinder (1) and being perpendicular to the first dividing line (11), the first gas discharge port (4) is located on a side of the second dividing line (12) away from the first vane slot (9), and the second gas discharge port (5) is located on a side of the second dividing line (12) close to the first vane slot (9).

7. The rotary compressor pump body according to any one of claims 2 to 4, wherein in an axial projection plane of the rotary compressor pump body, each of the first gas discharge port (4) and the second gas discharge port (5) is configured as a crescent groove structure.

8. The rotary compressor pump body according to any one of claims 2 to 7, further comprising a first flange (13), wherein the first flange (13) is disposed on an axial side of the first cylinder (1) away from the second cylinder (2), so that the first gas discharge port (4) is disposed toward a side of the second cylinder (2), and the second gas discharge port (5) is disposed toward a side of the first flange (13); and the first flange (13) is provided with a first exhaust port (14) along an axial direction of the first flange (13), and the first exhaust port (14) is disposed opposite to and communicates with the second gas discharge port (5) of the first cylinder (1) along the axial direction of the first flange (13), so that the gas discharged from the first cylinder (1) through the second gas discharge port (5) is discharged through the first exhaust port (14) of the first flange (13).

9. The rotary compressor pump body according to claim 8, further comprising a partition plate (15) disposed between the first cylinder (1) and the second cylinder (2) along the axial direction of the rotary compressor pump body, wherein the partition plate (15) is provided with a second exhaust port (27) and a middle chamber (16), the first gas discharge port (4) is in communication with the middle chamber (16) through the second exhaust port (27), the middle chamber (16) is also in communication with the second gas suction port (6) of the second cylinder (2); and the first cylinder (1) is further provided with an air replenishment passage (30), the partition plate (15) is further provided with an air replenishment port (31), the air replenishment passage (30) is in communication with an external air supply, and the air replenishment port (31) is connected between the air replenishment passage (30) and the middle chamber (16), so as to supply air to the second cylinder (2).

10. The rotary compressor pump body according to claim 9, further comprising a second flange (17) and a silencer (18), wherein the second flange (17) is disposed on an axial end face of the second cylinder (2) away from the partition plate (15), the second flange (17) is provided with a third exhaust port (19), and the third exhaust port (19) is disposed opposite to and communicates with the third gas discharge port (7) of the second cylinder (2); and the silencer (18) is mounted to cover on an axial side of the second flange (17) away from the second cylinder (2), an exhaust chamber (20) is formed between the silencer (18) and the second flange (17), and the exhaust chamber (20) is in communication with the third exhaust port (19).

11. The rotary compressor pump body according to claim 10, wherein a first flow-through hole (21) is provided through the first flange (13) along the axial direction of the first flange (13), a second flow-through hole (22) is provided through the first cylinder (1) along the axial direction of the first cylinder (1), a third flow-through hole (23) is provided through the partition plate (15) along the axial direction of the partition plate (15), a fourth flow-through hole (24) is provided through the second cylinder (2) along the axial direction of the second cylinder (2), and a fifth flow-through hole (25) is provided through the second flange (17) along the axial direction of the second flange (17); and the first flow-through hole (21), the second flow-through hole (22), the third flow-through hole (23), the fourth flow-through hole (24) and the fifth flow-through hole (25) are all axially opposite to each other and communicate in sequence, and the fifth flow-through hole (25) is in communication with the exhaust chamber (20), so that the gas compressed by the second cylinder (2) is discharged through the exhaust chamber (20), the fifth flow-through hole (25), the fourth flow-through hole (24), the third flow-through hole (23), the second flow-through hole (22) and the first flow-through hole (21) in sequence.

12. The rotary compressor pump body according to any one of claims 1 to 11, further comprising a casing (26), wherein the first cylinder (1) and the second cylinder (2) are disposed inside the casing (26), the gas compressed in the first cylinder (1) is discharged into the casing (26) through the second gas discharge port (5), the gas compressed in the second cylinder (2) is discharged into the casing (26) through the third gas discharge port (7), and the gas compressed by the first cylinder (1) and the gas compressed by the second cylinder (2) are mixed in the casing (26).

13. A compressor, comprising the rotary compressor pump body according to any one of claims 1 to 12.

14. An air conditioner, comprising the compressor according to claim 13.

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