Rotary compressor and air conditioning system thereof

Abstract

The present invention provides a rotary compressor and an air conditioning system thereof, belonging to the field of air conditioning technology. The compressor includes a pump body assembly, a low-pressure stage compression portion having an upper flange exhaust chamber, a partition intermediate chamber being constructed between the low-pressure stage compression portion and the high-pressure stage compression portion, the low-pressure stage compression portion being controllably connected to the upper flange exhaust chamber via a first exhaust valve and to the partition intermediate chamber via a second exhaust valve, the upper flange exhaust chamber being controllably connected to the inner chamber of the housing via a third exhaust valve, the high-pressure stage compression portion being inhaled through the partition intermediate chamber and having a lower flange exhaust chamber, the high-pressure stage compression portion being controllably connected to the lower flange exhaust chamber via a fourth exhaust valve, the lower flange exhaust chamber being connected to the inner chamber of the housing, and an enthalpy-increasing component being able to connect to the partition intermediate chamber via a variable volume control structure. The present invention has a greater exhaust volume when the compressor operates in a single-stage mode, achieving consistency between the compressor displacement in the single-stage mode and the compressor displacement in the two-stage mode, thereby improving the overall energy efficiency of the compressor.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and in particular relates to a rotary compressor and an air conditioning system thereof. Background Art

[0002] In hot summers and cold winters, as well as in cold northern regions, conventional household air conditioners and heat pump water heaters often suffer from poor low-temperature heating, slow high-temperature cooling, and low energy efficiency. Heat pump water heaters also suffer from poor low-temperature hot water heating. The emergence of two-stage regenerative heating technology addresses these issues. Two-stage regenerative heating compressors are designed for these high-load, heavy-duty applications, requiring a high pressure ratio. This two-stage compression effectively distributes the pressure ratio, enabling efficient operation of the air conditioning system while reducing exhaust temperatures and improving compressor reliability. However, when used in low-load, light-duty applications, energy efficiency can be low, often inferior to conventional single-stage compressors. Summary of the Invention

[0003] Therefore, the present invention provides a rotary compressor and an air-conditioning system thereof, which can solve the technical problems of the two-stage enthalpy increase compressor in the prior art, such as small displacement and low energy efficiency under low load and light working conditions.

[0004] In order to solve the above problems, the present invention provides a rotary compressor, including a shell and a motor assembly and a pump body assembly in the shell, the pump body assembly including a low-pressure stage compression part and a high-pressure stage compression part, the low-pressure stage compression part is between the high-pressure stage compression part and the motor assembly, the low-pressure stage compression part is configured with an upper flange exhaust cavity on the side away from the high-pressure stage compression part, a partition intermediate cavity is configured between the low-pressure stage compression part and the high-pressure stage compression part, the low-pressure stage compression part is controllably connected to the upper flange exhaust cavity through a first exhaust valve, and the low-pressure stage compression part is controllably connected to the upper flange exhaust cavity through a first exhaust valve. The second exhaust valve is controllably connected to the middle cavity of the partition, the upper flange exhaust cavity is controllably connected to the inner cavity of the shell through the third exhaust valve, the high-pressure stage compression part inhales air through the middle cavity of the partition and is constructed with a lower flange exhaust cavity on the side away from the low-pressure stage compression part, the high-pressure stage compression part is controllably connected to the lower flange exhaust cavity through the fourth exhaust valve, the lower flange exhaust cavity is connected to the inner cavity of the shell, the high-pressure stage compression part has a variable volume control structure and also includes an enthalpy increasing component, and the enthalpy increasing component can be connected to the middle cavity of the partition via the variable volume control structure.

[0005] In some embodiments, the partition middle cavity is connected to the upper flange exhaust cavity through a connecting pipe.

[0006] In some embodiments, the high-pressure stage compression section includes a high-pressure stage slide, and the variable volume control structure includes a pin assembly arranged corresponding to the high-pressure stage slide, and the pin assembly has a locked position for locking the high-pressure stage slide and an unlocked position for releasing the lock of the high-pressure stage slide. When the rotary compressor operates in a single-stage mode, the pin assembly is in the locked position and the enthalpy increasing component is cut off from the intermediate cavity of the partition. When the rotary compressor operates in a two-stage mode, the pin assembly is in the unlocked position and the enthalpy increasing component is connected to the intermediate cavity of the partition via the variable volume control structure.

[0007] In some embodiments, the pin assembly includes a pin and a spring at the tail of the pin, the head of the pin is in communication with the inner cavity of the shell, the tail of the pin is in communication with a control channel, and the control channel is in communication with the interior of the enthalpy increasing component.

[0008] In some embodiments, the high-pressure stage compression part also includes a high-pressure stage cylinder, a pin hole is constructed in the high-pressure stage cylinder, the pin assembly is assembled in the pin hole, and an overflow channel is also constructed in the high-pressure stage cylinder, one end of the overflow channel is connected to the middle cavity of the partition, and the other end is controllably connected to the pin hole.

[0009] In some embodiments, the pin has a shaft body, the head and the tail are respectively located at the two ends of the shaft body, and the shaft body is constructed with an annular groove extending circumferentially around the axis of the shaft body. When the pin assembly is in the unlocked position, the annular groove is connected to the flow channel and the control channel. When the pin assembly is in the locked position, the annular groove is sealed by the hole wall of the pin hole.

[0010] In some embodiments, the pump body assembly is constructed with an exhaust channel extending along its axial direction, one end of the exhaust channel is connected to the lower flange exhaust cavity, and the other end of the exhaust channel is connected to the inner cavity of the shell where the motor assembly is located.

[0011] In some embodiments, the partition middle cavity is formed by the upper partition and the lower partition being fastened together; and / or, the upper flange exhaust cavity is formed by the upper flange and the upper cover being fastened together; and / or, the lower flange exhaust cavity is formed by the lower flange and the lower cover being fastened together.

[0012] The present invention also provides an air-conditioning system, comprising a two-stage enthalpy-increasing compressor, wherein the two-stage enthalpy-increasing compressor is the above-mentioned rotary compressor.

[0013] In some embodiments, the air-conditioning system further includes a first heat exchanger, a second heat exchanger, a first tee, a second tee, a four-way valve, and a flash evaporator located between the first heat exchanger and the second heat exchanger pipeline, wherein the first port of the first tee is connected to the exhaust port of the two-stage enthalpy increasing compressor, the second port of the first tee is controllably connected to the second port of the second tee through a first on-off valve, the third port of the first tee is connected to the first port of the four-way valve, the first port of the second tee is connected to the refrigerant inlet of the enthalpy increasing component, the third port of the second tee is controllably connected to the air supply port of the flash evaporator through a second on-off valve, the second port of the four-way valve is connected to the first heat exchanger, the third port of the four-way valve is connected to the intake port of the two-stage enthalpy increasing compressor, and the fourth port of the four-way valve is connected to the second heat exchanger.

[0014] In some embodiments, when the two-stage enthalpy increasing compressor operates in a single-stage mode, the first on-off valve is controlled to be connected and the second on-off valve is controlled to be cut off; or, when the two-stage enthalpy increasing compressor operates in a two-stage mode, the first on-off valve is controlled to be cut off and the second on-off valve is controlled to be connected.

[0015] The present invention provides a rotary compressor and an air-conditioning system thereof. When the compressor or the air-conditioning system operates in a single-stage mode, the high-pressure stage compression part does not perform secondary compression on the refrigerant, and most of the high-pressure refrigerant compressed by the low-pressure stage compression part will be discharged to the inner cavity of the shell 10 through the first exhaust valve, the second exhaust valve and the upper flange exhaust cavity, and then discharged from the compressor. This part of the refrigerant will not enter the high-pressure stage compression part for re-compression, and a small part will be discharged to the inner cavity of the shell through the high-pressure stage compression part and the lower flange exhaust cavity. Therefore, it has a larger exhaust volume (it is well known in the industry that the exhaust volume of the high-pressure stage compression part is smaller than that of the low-pressure stage compression part), that is, the compressor displacement in the single-stage mode is consistent with the compressor displacement in the two-stage mode, thereby improving the comprehensive energy efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the external structure of a rotary compressor according to an embodiment of the present invention (top view);

[0017] Figure 2 for Figure 1 Schematic diagram of the structure of AA;

[0018] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of the pump body assembly;

[0019] Figure 4 Schematic diagram of the pin assembly when the compressor of the present invention is in single-stage mode (the pin assembly is in the locked position at this time);

[0020] Figure 5 Schematic diagram of air flow when the compressor of the present invention is in single-stage mode (arrows in the figure indicate flow directions);

[0021] Figure 6 Schematic diagram of the pin assembly when the compressor of the present invention is in a two-stage mode (the pin assembly is in an unlocked position at this time);

[0022] Figure 7 Schematic diagram of air flow when the compressor of the present invention is in two-stage mode (arrows in the figure indicate flow directions);

[0023] Figure 8 Schematic diagram of air flow in an air-conditioning system according to another embodiment of the present invention, wherein the compressor is in a single-stage non-air-supplementing enthalpy-increasing state;

[0024] Figure 9 Schematic diagram of air flow in an air-conditioning system according to another embodiment of the present invention, when the compressor is in a two-stage air-supply and enthalpy-increasing state.

[0025] The reference numerals indicate:

[0026] 1. Motor assembly; 2. Pump assembly; 21. Low-pressure stage compression section; 211. First exhaust valve; 212. Second exhaust valve; 213. Low-pressure stage cylinder; 214. Low-pressure stage slide; 22. High-pressure stage compression section; 221. Fourth exhaust valve; 222. High-pressure stage slide; 223. Pin; 224. Spring; 225. Control channel; 23. Exhaust channel; 24. High-pressure stage cylinder; 31. Upper flange exhaust chamber; 311. Third exhaust valve; 32. Upper flange; 33. Upper cover plate; 41. Partition intermediate chamber; 42. Upper partition ;43. Lower partition; 51. Lower flange exhaust chamber; 52. Lower flange; 53. Lower cover plate; 6. Enthalpy increasing component; 7. Flow channel; 71. Ring groove; 10. Shell; 100. Two-stage enthalpy increasing compressor; 101. First heat exchanger; 102. Second heat exchanger; 103. Flash evaporator; 1041. First three-way pipe; 1042. Second three-way pipe; 1043. Four-way valve; 1051. First on-off valve; 1052. Second on-off valve; 106. Liquid distributor; 1071. First-stage throttling element; 1072. Second-stage throttling element. DETAILED DESCRIPTION

[0027] See also Figures 1 to 9As shown, according to an embodiment of the present invention, a rotary compressor is provided, comprising a shell 10 and a motor assembly 1 and a pump body assembly 2 in the shell 10. The motor assembly 1 is used to drive the pump body assembly 2 to compress the refrigerant. The pump body assembly 2 comprises a low-pressure stage compression part 21 and a high-pressure stage compression part 22. The low-pressure stage compression part 21 is between the high-pressure stage compression part 22 and the motor assembly 1. The low-pressure stage compression part 21 is configured with an upper flange exhaust chamber 31 on the side away from the high-pressure stage compression part 22. A partition intermediate chamber 41 is configured between the low-pressure stage compression part 21 and the high-pressure stage compression part 22. The low-pressure stage compression part 21 is controllably connected to the upper flange exhaust chamber 31 through a first exhaust valve 211 and is controllably connected to the partition intermediate chamber 41 through a second exhaust valve 212. The upper flange exhaust chamber 31 is controllably connected to the inner cavity of the shell 10 through a third exhaust valve 311. The high-pressure stage compression part 22 inhales air through the partition intermediate chamber 41 and is away from the low-pressure stage compression part A lower flange exhaust chamber 51 is constructed on one side of the stage compression part 21, and the high-pressure stage compression part 22 is controllably connected to the lower flange exhaust chamber 51 through the fourth exhaust valve 221, and the lower flange exhaust chamber 51 is connected to the inner cavity of the shell 10. The high-pressure stage compression part 22 has a variable volume control structure and also includes an enthalpy increasing component 6. The enthalpy increasing component 6 can be connected to the intermediate cavity 41 of the partition via the variable volume control structure. It can be understood that the enthalpy increasing component 6 is controllably connected to the medium-pressure gaseous refrigerant at the flash point of the air supply components such as the flash evaporator 103 of the air-conditioning system. The high-pressure stage compression part 22 is a variable volume structure, that is, the high-pressure stage slide 222 of the high-pressure stage compression part 22 in the single-stage mode is locked and disengaged from the high-pressure stage roller. At this time, the high-pressure stage compression part 22 is idling and does not compress the refrigerant. In the two-stage mode, the high-pressure stage slide 222 is contact-locked and contacts the high-pressure stage roller. At this time, the high-pressure stage compression part 22 performs secondary compression on the refrigerant discharged from the low-pressure stage compression part 21. In this technical solution, when the compressor or air-conditioning system operates in single-stage mode, the high-pressure stage compression part 22 does not compress the refrigerant for the second time, and most of the high-pressure refrigerant compressed by the low-pressure stage compression part 21 will be discharged to the inner cavity of the shell 10 through the first exhaust valve 211, the second exhaust valve 212 and the upper flange exhaust chamber 31, and then discharged from the compressor. This part of the refrigerant will not enter the high-pressure stage compression part 22 for re-compression, and a small part will be discharged to the inner cavity of the shell 10 through the high-pressure stage compression part 22 and the lower flange exhaust chamber 51, so it has a larger exhaust volume (it is well known in the industry that the exhaust volume of the high-pressure stage compression part 22 is smaller than that of the low-pressure stage compression part 21), that is, the compressor displacement in the single-stage mode is consistent with the compressor displacement in the two-stage mode, thereby improving the comprehensive energy efficiency of the compressor.

[0028] In some embodiments, the partition middle cavity 41 is connected to the upper flange exhaust cavity 31 through a connecting pipe (not shown and not labeled in the figure). Specifically, the connecting channel can be a separate pipe assembly independent of the pump body assembly 2, as long as the connection between the two cavities is achieved. More preferably, the connecting channel is constructed in the corresponding partition and the low-pressure stage cylinder 213, so that the pump body assembly structure is more compact. At this time, it can be understood that since the partition middle cavity 41 is connected to the upper flange exhaust cavity 31 through the connecting channel, in the single-stage mode, a part of the exhaust of the low-pressure stage compression part 21 directly enters the upper flange exhaust cavity 31 through the first exhaust valve 211 and is discharged to the inner cavity of the shell 10 through the third exhaust valve 311, and the other part enters the partition middle cavity 41 through the second exhaust valve 212 and flows into the upper flange exhaust cavity 31 again through the connecting channel for discharge. Therefore, the exhaust volume in the single-stage mode is much larger than the exhaust volume of the high-pressure stage compression part 22.

[0029] In some embodiments, the high-pressure stage compression section 22 includes a high-pressure stage slide 222, and the variable capacitance control structure includes a pin assembly corresponding to the high-pressure stage slide 222, and the pin assembly has a locking position for locking the high-pressure stage slide 222 (such as Figure 4 As shown) and the unlocked position for releasing the lock of the high pressure stage slide 222 (as shown Figure 6 When the rotary compressor operates in single-stage mode, i.e. Figure 4 As shown, the pin assembly is in the locked position and the enthalpy increasing component 6 is disconnected from the partition middle cavity 41. At this time, the airflow in the enthalpy increasing component 6 will not enter the partition middle cavity 41, that is, the enthalpy increasing component 6 does not play the role of replenishing air and increasing enthalpy, but only serves as the position switch of the pin assembly to control the airflow. When the rotary compressor operates in the two-stage mode, that is, Figure 6 As shown, the pin assembly is in the unlocked position and the enthalpy-increasing component 6 is connected to the baffle intermediate cavity 41 via the variable volume control structure. At this time, the medium-pressure airflow within the enthalpy-increasing component 6 will be introduced into the baffle intermediate cavity 41 to achieve the purpose of replenishing air and increasing enthalpy for the secondary compression. It should be noted that the airflow flowing out of the enthalpy-increasing component 6 at this time is also used to control the position switching of the pin assembly. Specifically, the pin assembly includes a pin 223 and a spring 224 at the tail of the pin 223. The head of the pin 223 is always connected to the inner cavity of the housing 10, and the tail of the pin 223 is connected to the control channel 225, which is in communication with the interior of the enthalpy-increasing component 6.

[0030] See also Figure 4 and Figure 6As shown, the high-pressure stage compression part 22 also includes a high-pressure stage cylinder 24, which is provided with a pin hole, and the pin assembly is assembled in the pin hole. The high-pressure stage cylinder 24 is also provided with a flow channel 7, and one end of the flow channel 7 is connected to the partition middle cavity 41, and the other end is controllably connected to the pin hole. The flow channel 7 is constructed in the high-pressure stage cylinder 24 to make the structure of the compressor more compact. In a specific embodiment, the pin 223 has a shaft body, with a head and a tail respectively located at the two ends of the shaft body. The shaft body is constructed with an annular groove 71 extending circumferentially around the axis of the shaft body. When the pin assembly is in the unlocked position, the annular groove 71 is connected to the flow channel 7 and the control channel 225. When the pin assembly is in the locked position, the annular groove 71 is sealed by the hole wall of the pin hole. In this technical solution, the annular groove 71 is connected or cut off with the flow channel 7 by changing the position of the pin 223, thereby realizing that the high-pressure stage compression part 22 is not compressed in the single-stage mode, and the air is supplemented and the enthalpy is increased in the two-stage mode. The structure is particularly simple and the control is convenient.

[0031] See also Figure 5 and Figure 7 As shown, the pump body assembly 2 is constructed with an exhaust channel 23 extending along its axial direction. One end of the exhaust channel 23 is connected to the lower flange exhaust chamber 51, and the other end of the exhaust channel 23 is connected to the inner cavity of the shell 10 where the motor assembly 1 is located. The exhaust channel 23 is specifically formed by the lower flange 52, the high-pressure stage cylinder 24, the lower partition 43, the upper partition 42, the upper flange 32, and the through holes at corresponding positions on the upper cover plate 33. There is no need to set up a separate pipeline, and the structure is simple and compact.

[0032] See also Figure 5 As shown, in the single-stage mode of compressor operation, the low-pressure stage compression part 21 sucks low-pressure refrigerant airflow into its interior for compression to form high-pressure refrigerant airflow, part of which enters the upper flange exhaust chamber 31 through the first exhaust valve 211 and is discharged to the inner cavity of the shell 10 through the third exhaust valve 311 and discharged from the compressor, and the other part enters the partition middle cavity 41 through the second exhaust valve 212. At this time, part of it enters the upper flange exhaust chamber 31 through the connecting channel and is discharged to the inner cavity of the shell 10 by the third exhaust valve 311, and the other part enters the high-pressure stage compression part 22 (at this time it does not compress the refrigerant therein) and is discharged to the lower flange exhaust chamber 51 through the fourth exhaust valve 221, and then enters the inner cavity of the shell 10 through the exhaust channel 23 and is finally discharged from the compressor, achieving a large displacement in the single-stage mode; see Figure 7As shown, in the two-stage mode of compressor operation, the low-pressure stage compression part 21 sucks in the low-pressure refrigerant airflow into its interior and is compressed to form a medium-pressure refrigerant airflow, and a part of it enters the upper flange exhaust chamber 31 through the first exhaust valve 211. At this time, due to the action of the high-pressure back pressure in the shell 10, the third exhaust valve 311 cannot be opened, and the medium-pressure refrigerant airflow entering the upper flange exhaust chamber 31 enters the partition middle chamber 41 through the connecting channel, and another part of the medium-pressure refrigerant airflow in the low-pressure stage compression part 21 enters the partition middle chamber 41 through the second exhaust valve 212. The medium-pressure refrigerant airflow entering the partition middle chamber 41 is sucked in by the high-pressure stage compression part 22 and is compressed twice therein to form a high-pressure refrigerant airflow, enters the lower flange exhaust chamber 51 through the fourth exhaust valve 221 and enters the inner cavity of the shell 10 through the exhaust channel 23 and is discharged from the compressor.

[0033] In some embodiments, the partition middle cavity 41 is formed by the upper partition 42 and the lower partition 43 being interlocked; and / or, the upper flange exhaust cavity 31 is formed by the upper flange 32 and the upper cover plate 33 being interlocked; and / or, the lower flange exhaust cavity 51 is formed by the lower flange 52 and the lower cover plate 53 being interlocked, thereby facilitating the manufacturing process of each chamber.

[0034] The aforementioned high pressure, medium pressure and low pressure are all relative, and their specific pressure values can be reasonably selected according to the design requirements of the compressor.

[0035] The present invention also provides an air conditioning system, comprising a two-stage enthalpy-increasing compressor 100, which is the rotary compressor described above. Figure 8 and Figure 9As shown, the air conditioning system further includes a first heat exchanger 101, a second heat exchanger 102, a first three-way pipe 1041, a second three-way pipe 1042, a four-way valve 1043, and a flash evaporator 103 located between the first heat exchanger 101 and the second heat exchanger 102, wherein the first port of the first three-way pipe 1041 is connected to the exhaust port of the two-stage enthalpy increase compressor 100, and the second port of the first three-way pipe 1041 is controllably connected to the second port of the second three-way pipe 1042 through the first on-off valve 1051, and the first The third port of the three-way pipe 1041 is connected to the first port of the four-way valve 1043, the first port of the second three-way pipe 1042 is connected to the refrigerant inlet of the enthalpy increase component 6, the third port of the second three-way pipe 1042 is controllably connected to the air supply port of the flash evaporator 103 through the second on-off valve 1052, the second port of the four-way valve 1043 is connected to the first heat exchanger 101, the third port of the four-way valve 1043 is connected to the intake port of the two-stage enthalpy increase compressor 100, and the fourth port of the four-way valve 1043 is connected to the second heat exchanger 102. Specifically, when the two-stage enthalpy increasing compressor 100 operates in single-stage mode, the first on-off valve 1051 is controlled to be connected and the second on-off valve 1052 is controlled to be cut off; or, when the two-stage enthalpy increasing compressor 100 operates in two-stage mode, the first on-off valve 1051 is controlled to be cut off and the second on-off valve 1052 is connected. At this time, the air supply port of the flash evaporator 103 is connected to the enthalpy increasing component 6.

[0036] It is easy for those skilled in the art to understand that, under the premise of no conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A rotary compressor comprising a housing (10) and a motor assembly (1) and a pump assembly (2) located in the housing (10), characterized in that: The pump body assembly (2) comprises a low-pressure stage compression part (21) and a high-pressure stage compression part (22), wherein the low-pressure stage compression part (21) is located between the high-pressure stage compression part (22) and the motor assembly (1), an upper flange exhaust chamber (31) is constructed on a side of the low-pressure stage compression part (21) away from the high-pressure stage compression part (22), a partition intermediate chamber (41) is constructed between the low-pressure stage compression part (21) and the high-pressure stage compression part (22), the low-pressure stage compression part (21) is controllably connected to the upper flange exhaust chamber (31) through a first exhaust valve (211), and is controllably connected to the partition intermediate chamber (41) through a second exhaust valve (212), and the upper flange exhaust chamber ( 31) is controllably connected to the inner cavity of the shell (10) through the third exhaust valve (311), the high-pressure stage compression part (22) inhales air through the partition middle cavity (41) and is configured with a lower flange exhaust cavity (51) on the side away from the low-pressure stage compression part (21), the high-pressure stage compression part (22) is controllably connected to the lower flange exhaust cavity (51) through the fourth exhaust valve (221), the lower flange exhaust cavity (51) is connected to the inner cavity of the shell (10), the high-pressure stage compression part (22) has a variable volume control structure, and also includes an enthalpy increasing component (6), the enthalpy increasing component (6) can be connected to the partition middle cavity (41) via the variable volume control structure; the high-pressure stage compression part (2 2) includes a high-pressure stage slide (222), the variable capacity control structure includes a pin assembly corresponding to the high-pressure stage slide (222), the pin assembly has a locking position for locking the high-pressure stage slide (222) and an unlocking position for releasing the lock of the high-pressure stage slide (222), when the rotary compressor operates in a single-stage mode, the pin assembly is in the locking position and the enthalpy increasing component (6) is cut off from the communication with the partition middle cavity (41), when the rotary compressor operates in a two-stage mode, the pin assembly is in the unlocking position and the enthalpy increasing component (6) is communicated with the partition middle cavity (41) via the variable capacity control structure; the pin assembly includes a pin A pin (223) and a spring (224) at the tail of the pin (223), the head of the pin (223) is in constant communication with the inner cavity of the shell (10), the tail of the pin (223) is in communication with a control channel (225), and the control channel (225) is in communication with the interior of the enthalpy increasing component (6); the high-pressure stage compression part (22) further includes a high-pressure stage cylinder (24), a pin hole is configured in the high-pressure stage cylinder (24), the pin assembly is assembled in the pin hole, and an overflow channel (7) is also configured in the high-pressure stage cylinder (24), one end of the overflow channel (7) is in communication with the intermediate cavity (41) of the partition, and the other end is controllably communicated with the pin hole;The pin (223) has a shaft body, the head and the tail are respectively located at two ends of the shaft body, and the shaft body is configured with an annular groove (71) extending circumferentially around the axis of the shaft body. When the pin assembly is in the unlocked position, the annular groove (71) is communicated with the flow passage (7) and the control passage (225). When the pin assembly is in the locked position, the annular groove (71) is sealed by the hole wall of the pin hole.

2. The rotary compressor according to claim 1, wherein The partition plate middle cavity (41) is communicated with the upper flange exhaust cavity (31) via a communication pipeline.

3. The rotary compressor according to claim 1, wherein The pump body assembly (2) is provided with an exhaust passage (23) extending along its axial direction, one end of the exhaust passage (23) being in communication with the lower flange exhaust cavity (51), and the other end of the exhaust passage (23) being in communication with the inner cavity of the housing (10) where the motor assembly (1) is located.

4. The rotary compressor according to claim 1, wherein The partition intermediate cavity (41) is formed by the upper partition (42) and the lower partition (43) being fastened together; and / or, the upper flange exhaust cavity (31) is formed by the upper flange (32) and the upper cover (33) being fastened together; and / or, the lower flange exhaust cavity (51) is formed by the lower flange (52) and the lower cover (53) being fastened together.

5. An air conditioning system comprising a two-stage enthalpy-increasing compressor (100), characterized in that: The two-stage enthalpy-increasing compressor (100) is the rotary compressor according to claim 1.

6. The air conditioning system according to claim 5, characterized in that The invention also comprises a first heat exchanger (101), a second heat exchanger (102), a first three-way pipe (1041), a second three-way pipe (1042), a four-way valve (1043), and a flash evaporator (103) located between the pipelines of the first heat exchanger (101) and the second heat exchanger (102), wherein a first port of the first three-way pipe (1041) is connected to the exhaust port of the two-stage enthalpy increasing compressor (100), a second port of the first three-way pipe (1041) is controllably connected to the second port of the second three-way pipe (1042) via a first on-off valve (1051), and the first three-way pipe (1041) is connected to the exhaust port of the two-stage enthalpy increasing compressor (100). ) is connected to the first port of the four-way valve (1043), the first port of the second three-way pipe (1042) is connected to the refrigerant inlet of the enthalpy increasing component (6), the third port of the second three-way pipe (1042) is controllably connected to the air supply port of the flash evaporator (103) through the second on-off valve (1052), the second port of the four-way valve (1043) is connected to the first heat exchanger (101), the third port of the four-way valve (1043) is connected to the intake port of the two-stage enthalpy increasing compressor (100), and the fourth port of the four-way valve (1043) is connected to the second heat exchanger (102).

7. The air conditioning system according to claim 6, characterized in that When the two-stage enthalpy increasing compressor (100) operates in a single-stage mode, the first on-off valve (1051) is controlled to be connected and the second on-off valve (1052) is controlled to be cut off; or, when the two-stage enthalpy increasing compressor (100) operates in a two-stage mode, the first on-off valve (1051) is controlled to be cut off and the second on-off valve (1052) is controlled to be connected.

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