A rotary compressor

Abstract

The application belongs to the technical field of compressors, and particularly relates to a rotor compressor. The rotor compressor further comprises a gas conveying mechanism, the gas conveying mechanism comprising an air inlet member and an air outlet member, the input end of the air inlet member being arranged outside the casing, the output end of the air inlet member being in communication with the air inlet of the compression chamber; the air inlet member is used for conveying refrigerant to the compression chamber, and the compression chamber is used for compressing the refrigerant; the input end of the air outlet member is in communication with the air outlet of the compression chamber, the output end of the air outlet member being arranged outside the casing, and the air outlet member is used for conveying the compressed refrigerant outside the casing. The rotor compressor provided by the application can improve the heat dissipation and output efficiency of the compressor.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of compressors, and particularly relates to a rotor compressor. BACKGROUND

[0002] CN114294232A discloses an oil separation device for reducing oil discharge rate and a rotary compressor. The oil separation device comprises a guide part for changing the direction of airflow and a fixed part connected with a muffler. The guide part is composed of an arc surface and an extension baffle. The arc surface extends upwards along the outer periphery of the muffler exhaust hole, and the extension baffle is connected with the edge of the arc surface. The fixed part is used for connecting the arc surface and the extension baffle with the outer surface of the muffler. The airflow discharged from the muffler exhaust hole passes through the channel formed by the arc surface and the extension baffle and is horizontally discharged. The oil separation device for reducing oil discharge rate is installed on the muffler exhaust hole. Under the action of the oil separation device, the direction of the airflow is changed, and the airflow is discharged into the cylinder. Then, the airflow passes through the motor and is discharged into the refrigeration system through the exhaust pipe. The existing design discharges the mixture of high-temperature and high-pressure refrigerant gas and lubricating oil into the cylinder (i.e., the shell) after compression, which seriously affects the heat dissipation and output efficiency of the compressor. On the other hand, the cylinder is in a high-temperature and high-pressure state during the operation of the compressor, and under this condition, the viscosity of the lubricating oil of the compressor is reduced, and the lubricating oil is easily carbonized and decomposed to lose the lubricating effect. SUMMARY

[0003] In view of the deficiencies of the prior art, the application provides a rotor compressor.

[0004] The application provides a rotor compressor, which comprises a shell, a driving motor, a crankshaft, a piston and a cylinder. The driving motor and the cylinder are arranged on the shell. The driving motor is connected with the crankshaft, and the driving motor drives the rotation of the crankshaft. The piston is sleeved outside the crankshaft, and the crankshaft drives the rotation of the piston. The piston is arranged in the cylinder, and a compression chamber is formed between the piston and the cylinder. An air inlet and an air outlet are further arranged on the compression chamber and communicate with the compression chamber respectively.

[0005] The rotor compressor further comprises a gas conveying mechanism. The gas conveying mechanism comprises an air inlet member and an air outlet member. The input end of the air inlet member is arranged outside the shell. The output end of the air inlet member and the air inlet of the compression chamber communicate with each other. The air inlet member is used for conveying refrigerant to the compression chamber, and the compression chamber is used for compressing the refrigerant. The input end of the air outlet member communicates with the air outlet of the compression chamber. The output end of the air outlet member is arranged outside the shell. The air outlet member conveys the compressed refrigerant outside the shell.

[0006] Preferably, the cylinder comprises a first cylinder and a second cylinder, the first cylinder and the second cylinder are provided with the piston, the first cylinder and the second cylinder form a first compression chamber and a second compression chamber with the piston respectively, the first compression chamber and the second compression chamber are used for compressing refrigerant; the gas conveying mechanism further comprises an exhaust valve and a gas chamber, the first compression chamber and the second compression chamber are connected in series or in parallel through the exhaust valve and the gas chamber.

[0007] Preferably, the input end and the output end of the first compression chamber are provided with a first gas inlet and a first exhaust port respectively, the input end and the output end of the second compression chamber are provided with a second gas inlet and a second exhaust port respectively, the exhaust valve comprises a first exhaust valve and a second exhaust valve, the first exhaust valve and the second exhaust valve are further provided correspondingly with the first exhaust port and the second exhaust port respectively; the gas conveying mechanism further comprises a partition plate, the upper end face of the first cylinder and the lower end face of the second cylinder are respectively installed with the lower end face and the upper end face of the partition plate, the gas chamber penetrates through the partition plate, the gas chamber is communicated with the first compression chamber and the second compression chamber, and the first exhaust valve and the second exhaust valve are respectively installed on the partition plate.

[0008] Preferably, the gas chamber comprises a first gas chamber, a second gas chamber, a third gas chamber and a gas-liquid separation chamber, the input end and the output end of the first gas chamber are communicated with the gas inlet member and the first gas inlet respectively, the first exhaust port is communicated with the second gas chamber, the first exhaust valve is arranged at the first exhaust port, the second gas chamber is communicated with the second gas inlet, the second exhaust port is communicated with the third gas chamber, the second exhaust valve is arranged at the second exhaust port, and the output end of the third gas chamber is communicated with the gas-liquid separation chamber; the gas-liquid separation chamber separates the gas-liquid mixture discharged from the second exhaust port, the gas-liquid separation chamber delivers the separated gas to the exhaust member, an oil storage pool is arranged in the casing, and the gas-liquid separation chamber delivers the separated lubricating oil to the oil storage pool; or

[0009] The gas chamber comprises a first gas chamber, a second gas chamber and a gas-liquid separation chamber, the input end of the first gas chamber is communicated with the gas inlet member, the output end of the first gas chamber is communicated with the first gas inlet and the second gas inlet, the first exhaust port and the second exhaust port are communicated with the second gas chamber respectively, the first exhaust valve is arranged at the first exhaust port, the second exhaust valve is arranged at the second exhaust port, the gas-liquid separation chamber is connected with the output end of the second gas chamber and separates the gas-liquid mixture discharged from the first exhaust port and the second exhaust port, the gas-liquid separation chamber delivers the separated gas to the exhaust member, an oil storage pool is arranged in the casing, and the gas-liquid separation chamber delivers the separated lubricating oil to the oil storage pool.

[0010] Preferably, the rotor compressor further comprises a driving motor, the driving motor is arranged on the casing, the driving motor is connected with the crankshaft, and the driving motor drives the crankshaft to rotate; the casing is internally provided with a mounting cavity, the driving motor, the partition plate, the first cylinder and the second cylinder are arranged in the mounting cavity, the input end of the air inlet member and the output end of the air outlet member are arranged outside the mounting cavity, and the air pressure in the mounting cavity is lower than the air pressure in the compression cavity when the rotor compressor is in a compression operation.

[0011] Preferably, the rotor compressor further comprises an oil delivery mechanism, the oil delivery mechanism comprises an oil storage pool, an oil inlet, a pumping cavity, a pumping blade, an oil throwing hole and a gas-liquid separator, the oil storage pool is arranged in the casing, the oil inlet, the pumping cavity, the pumping blade and the oil throwing hole are arranged on the crankshaft, the oil inlet is communicated with the oil storage pool, the pumping cavity is communicated with the oil inlet, the pumping blade is drivingly connected with the crankshaft, the pumping blade is arranged in the pumping cavity, one end of the oil throwing hole is communicated with the pumping cavity, the cylinder is in a clearance fit with the radial end face of the piston, and the clearance between the cylinder and the radial end face of the piston is communicated with the other end of the oil throwing hole, the oil throwing hole is used for delivering lubricating oil into the compression cavity, and the gas-liquid separator is arranged between the input end of the air outlet member and the exhaust port of the compression cavity, the gas-liquid separator separates lubricating oil and refrigerant discharged from the exhaust port, and delivers the lubricating oil back into the oil storage pool.

[0012] Preferably, a gas-liquid separation cavity is further arranged between the input end of the air outlet member and the exhaust port of the compression cavity, the gas-liquid separation cavity is respectively communicated with the air outlet member and the compression cavity, and the air pressure in the gas-liquid separation cavity is higher than the air pressure in the oil storage pool.

[0013] Preferably, the gas-liquid separator comprises a filter core, an oil outlet, an oil outlet channel, an oil outlet core shaft and a core shaft mounting seat, the upper end opening of the oil outlet channel is communicated with the gas-liquid separation cavity, the upper end opening of the oil outlet channel is lower than the input end of the air outlet member, the lower end opening of the oil outlet channel is communicated with the oil storage pool, the filter core is mounted at the upper end opening of the oil outlet channel, the filter core is upwardly protruded compared with the bottom wall of the gas-liquid separation cavity, the oil outlet core shaft and the core shaft mounting seat are in a clearance fit and arranged in the oil outlet channel, and the oil outlet core shaft and the core shaft mounting seat are located below the filter core and correspondingly arranged at the output end of the filter core, and the clearance between the oil outlet core shaft and the core shaft mounting seat is communicated with the oil outlet channel.

[0014] Preferably, a mounting cavity is arranged in the casing, the oil pool is formed by part of the mounting cavity, the oil pool is located at the lower end of the casing, the oil pool stores lubricating oil, the lubricating oil is immersed in the oil inlet when the rotary compressor is working; when the oil throwing hole delivers the lubricating oil into the compression cavity, the lubricating oil is delivered to the gas-liquid separation cavity along the delivery direction of the refrigerant; the gas-liquid separation cavity is provided with a separation cavity partition, the separation cavity partition is used for separating the gas-liquid mixture, one end of the separation cavity partition is connected with one end of the inner wall of the gas-liquid separation cavity, the other end of the separation cavity partition is freely extended and is arranged in interval with the other end of the inner wall of the gas-liquid separation cavity, and the bottom wall of the gas-liquid separation cavity is further provided with a downwardly concave sedimentation groove, the sedimentation groove is used for collecting the settled lubricating oil.

[0015] Preferably, the compression cavity comprises a first compression cavity and a second compression cavity, the gas cavity comprises a first gas cavity, a second gas cavity and a third gas cavity, the first gas cavity, the first compression cavity, the second gas cavity, the second compression cavity, the gas-liquid separation cavity and the third gas cavity are sequentially connected in series, the lubricating oil enters the first compression cavity through the oil throwing hole, the lubricating oil and the refrigerant are sequentially delivered from the first compression cavity to the second gas cavity and the gas-liquid separation cavity, the gas-liquid separation cavity separates the lubricating oil and the refrigerant, the separated gas is delivered to the third gas cavity and then discharged to the outside, and the separated lubricating oil is delivered to the oil pool through the gas-liquid separator.

[0016] The compression cavity comprises a first compression cavity and a second compression cavity, the gas cavity comprises a first gas cavity and a second gas cavity, the input end of the first compression cavity and the input end of the second compression cavity are respectively communicated with the output end of the first gas cavity, the output end of the first compression cavity and the output end of the second compression cavity are respectively communicated with the input end of the second gas cavity, the lubricating oil enters the first compression cavity and the second compression cavity through the oil throwing hole, the lubricating oil and the refrigerant enter the gas-liquid separation cavity through the first compression cavity and the second compression cavity and are separated, the separated gas is delivered to the second gas cavity and then discharged to the outside, and the separated lubricating oil is delivered to the oil pool through the gas-liquid separator. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which preferred embodiments of the application are shown. Like reference numerals refer to like elements throughout the drawings and the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the application.

[0018] Figure 1 Two-cylinder two-stage compression rotary compressor structure schematic diagram provided for the embodiment;

[0019] Figure 2 For Figure 1 Partial schematic view;

[0020] Figure 3 Structure diagram of a rotor compressor with two cylinders in parallel for one-stage compression according to an embodiment;

[0021] Figure 4 Structure diagram of a rotor compressor with oil delivery mechanism according to an embodiment;

[0022] Figure 5 Structure diagram of a rotor compressor according to an embodiment;

[0023] Figure 6 Structure diagram of a rotor compressor according to an embodiment; Figure 5 Top view;

[0024] Figure 7 Structure diagram of a rotor compressor according to an embodiment; Figure 5 Sectional view;

[0025] Figure 8 Structure diagram of a rotor compressor according to an embodiment;

[0026] Figure 9 Sectional view of A-A according to an embodiment; Figure 8

[0027] Casing 100 Second valve body mounting end 208 Mounting cavity 101 First air cavity 209 Driving motor 102 Second air cavity 210 Crankshaft 103 Third air cavity 211 Piston 104 Gas-liquid separation cavity 212 Sliding vane 105 Separation cavity partition 213 First cylinder 106 Sedimentation tank 215 First compression cavity 107 Partition 216 First air inlet 108 A plate 217 First air outlet 109 B plate 218 Second cylinder 110 C plate 219 Second compression cavity 111 Separation cavity input end 220 Second air inlet 112 Oil delivery mechanism 300 Second air outlet 113 Oil inlet 301 Oil storage pool 114 Pump oil cavity 302 Lower cylinder bottom cover 115 Pump oil vane 303 Gas delivery mechanism 200 Oil throwing hole 304 Air inlet 201 Gas-liquid separator 305 Air outlet 202 Filter element 306 First air outlet valve 203 Oil outlet 307 First valve vane 204 Oil outlet channel 308 First valve body mounting end 205 Oil outlet spindle 309 Second air outlet valve 206 Spindle mounting seat 310 Second valve vane 207 DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present application, a more complete description of the present application will be made with reference to the accompanying drawings.

[0029] It should be noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or can exist with an intervening element. The terms "mount", "one end", "the other end" and the like used herein are only for illustrative purposes.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0031] Reference will now be made to Figure 1 - Figure 9 ​The application provides a rotor compressor, which comprises a shell 100, a driving motor 102, a crankshaft 103, a piston 104 and a cylinder, the driving motor 102 and the cylinder are arranged on the shell 100, the driving motor 102 is connected with the crankshaft 103, the driving motor 102 drives the crankshaft 103 to rotate, the piston 104 is sleeved outside the crankshaft 103, the crankshaft 103 drives the piston 104 to rotate, the piston 104 is arranged in the cylinder, and a compression cavity is formed between the piston 104 and the cylinder; an air inlet and an air outlet which respectively communicate with the compression cavity are further arranged on the compression cavity.

[0032] The rotor compressor further comprises a gas conveying mechanism 200, the gas conveying mechanism 200 comprises an air inlet part 201 and an air outlet part 202, an input end of the air inlet part 201 is arranged outside the shell 100, an output end of the air inlet part 201 and the air inlet of the compression cavity are in communication, the air inlet part 201 is used for conveying refrigerant to the compression cavity, and the compression cavity is used for compressing the refrigerant; an input end of the air outlet part 202 is in communication with the air outlet of the compression cavity, and an output end of the air outlet part 202 is arranged outside the shell 100, the air outlet part 202 conveys the compressed refrigerant outside the shell 100. The rotor compressor provided by the application can improve the heat dissipation and output efficiency of the compressor. The air outlet part 202 can adopt an air outlet pipe or an air outlet valve and combinations thereof, and the air inlet part 201 can adopt an air inlet pipe or an air inlet valve and combinations thereof. How the rotor compressor compresses refrigerant to refrigerate is prior art.

[0033] In the preferred embodiment, the cylinder comprises a first cylinder 106 and a second cylinder 110, the piston 104 is arranged in the first cylinder 106 and the second cylinder 110, the first cylinder 106 and the second cylinder 110 form a first compression cavity 107 and a second compression cavity 111 with the piston 104 respectively, and the first compression cavity 107 and the second compression cavity 111 are used for compressing refrigerant; the gas conveying mechanism 200 further comprises a gas valve and a gas cavity, and the first compression cavity 107 and the second compression cavity 111 are connected in series or in parallel through the gas valve and the gas cavity. Through the gas valve and the gas cavity, the compressor can have multiple cylinders connected in parallel or in series to compress gaseous refrigerant, the gaseous refrigerant compressed by the cylinders connected in parallel is combined together when connected in parallel, the gas pressure of the gaseous refrigerant is gradually increased when connected in series, thereby forming single-machine double-stage compression, for example, the first compression cavity 107 preliminarily compresses the gaseous refrigerant when the first compression cavity 107 and the second compression cavity 111 are connected in series, and then the second compression cavity 111 further compresses the preliminarily compressed gaseous refrigerant, thereby obtaining gaseous refrigerant with higher pressure. The compressor is more widely applicable and has better functions.

[0034] In the preferred embodiment, the input end and the output end of the first compression cavity 107 are respectively provided with a first air inlet 108 and a first air outlet 109, the input end and the output end of the second compression cavity 111 are respectively provided with a second air inlet 112 and a second air outlet 113, the air valve comprises a first air outlet valve 203 and a second air outlet valve 206, the first air outlet valve 203 and the second air outlet valve 206 are respectively arranged corresponding to the first air outlet 109 and the second air outlet 113; the air conveying mechanism 200 further comprises a partition plate 216, the upper end face of the first cylinder 106 and the lower end face of the second cylinder 110 are respectively installed with the lower end face and the upper end face of the partition plate 216, the air cavity penetrates through the partition plate 216, the air cavity is in communication with the first compression cavity 107 and the second compression cavity 111, and the first air outlet valve 203 and the second air outlet valve 206 are respectively installed on the partition plate 216. The partition plate 216 is convenient for the installation of the cylinder, and at the same time, the air cavity arranged in the partition plate 216 makes the air connection between the cylinders more convenient. Further, the partition plate 216, the first cylinder 106 and the second cylinder 110 are fixed by fasteners, for example, fastened by studs. Further, the lower end of the first cylinder 106 is provided with a lower cylinder bottom cover 115.

[0035] Please refer to Figure 1 and Figure 2, preferably two cylinders in series compression, the gas chambers include a first gas chamber 209, a second gas chamber 210, a third gas chamber 211 and a gas-liquid separation chamber 212, the input end and the output end of the first gas chamber 209 are in communication with the gas inlet member 201 and the first gas inlet 108 respectively, the first gas outlet 109 is in communication with the second gas chamber 210, the first gas outlet valve 203 is arranged at the first gas outlet 109, the second gas chamber 210 is in communication with the second gas inlet 112, the second gas outlet 113 is in communication with the third gas chamber 211, the second gas outlet valve 206 is arranged at the second gas outlet 113, and the output end of the third gas chamber 211 is in communication with the gas outlet member 202. The gas-liquid separation chamber 212 separates the gas-liquid mixture discharged from the second gas outlet, the gas-liquid separation chamber 212 delivers the separated gas to the third gas chamber, and the third gas chamber 211 discharges the gas to the outside through the gas outlet member 202; the gas-liquid separation chamber 212 delivers the separated lubricating oil to the oil storage pool 114. The gray arrows in the figure represent the flow direction of the refrigerant. Further, the partition plate 216 includes an A plate 217, a B plate 218 and a C plate 219, the first gas chamber 209 sequentially penetrates the A plate 217, the B plate 218 and the C plate 219 of the partition plate 216, and the upper and lower ends of the first gas chamber 209 extend to the second cylinder 110 and the first cylinder 106 respectively, the second gas chamber 210 sequentially penetrates the A plate 217, the B plate 218 and the C plate 219 of the partition plate 216, and the third gas chamber 211 is formed by the recessed cavity between the C plate 219 and the second cylinder 110. Further, the first gas outlet valve 203 includes a first valve body mounting end 205 and a first valve plate 204, the free end of the first valve plate 204 is movably arranged at the first gas outlet 109, and the first valve body mounting end 205 is fixed on the A plate 217. The second gas outlet valve 206 includes a second valve body mounting end 208 and a second valve plate 207, the free end of the second valve plate 207 is movably arranged at the second gas outlet 113, and the second valve body mounting end 208 is fixed on the C plate 219.

[0036] Please refer to Figure 3, preferably two cylinders in parallel compression, the gas cavity includes a first gas cavity 209, a second gas cavity 210 and a gas-liquid separation cavity 212, the input end of the first gas cavity 209 is in communication with the gas inlet member 201 respectively, the output end of the first gas cavity 209 is in communication with the first gas inlet 108 and the second gas inlet 112 respectively, the first gas outlet 109 and the second gas outlet 113 are in communication with the second gas cavity 210 respectively, the first exhaust valve 203 is arranged at the first gas outlet 109, the second exhaust valve 206 is arranged at the second gas outlet 113, the output end in communication of the second gas cavity 210 is in communication with the exhaust member 202. The gas-liquid separation cavity 212 separates the gas-liquid mixture discharged from the first gas outlet and the second gas outlet, the gas-liquid separation cavity 212 delivers the separated gas to the second gas cavity, the output end in communication of the second gas cavity is in communication with the exhaust member, and the second gas cavity 210 discharges externally through the exhaust member 202; the gas-liquid separation cavity 212 delivers the separated lubricating oil to the oil storage pool 114. The gray arrows in the figure are the flow directions of the refrigerant. The partition plate 216 includes an A plate 217 and a B plate 218, the first gas cavity 209 penetrates the A plate 217 and the B plate 218 of the partition plate 216 in sequence and extends to the second cylinder 110 and the first cylinder 106 at the upper and lower ends respectively, and the second gas cavity 210 penetrates the A plate 217 and the B plate 218 of the partition plate 216 in sequence. Further, the first exhaust valve 203 includes a first valve body mounting end 205 and a first valve plate 204, the free end of the first valve plate 204 is movably arranged at the first gas outlet 109, and the first valve body mounting end 205 is fixed on the A plate 217. The second exhaust valve 206 includes a second valve body mounting end 208 and a second valve plate 207, the free end of the second valve plate 207 is movably arranged at the second gas outlet 113, and the second valve body mounting end 208 is fixed on the B plate 218. Furthermore, since the exhaust pressures of the upper and lower cylinders are consistent, the traditional partition plate 216 only needs to be divided into two blocks for combination to realize the exhaust of the partition plate 216. When the upper and lower cylinders of the compressor are double-stage compression, the exhaust passages of the upper and lower cylinders cannot be shared due to different exhaust pressures, so the original partition plate 216 structure needs to be divided into three blocks for combination, and independent exhaust passages are arranged between each two blocks to avoid gas mixing in different pressure ranges.

[0037] In the preferred embodiment, the mounting cavity 101 is arranged in the casing 100, the drive motor 102, the partition plate 216, the first cylinder 106 and the second cylinder 110 are arranged in the mounting cavity 101, the input end of the gas inlet member 201 and the output end of the exhaust member 202 are arranged outside the mounting cavity 101, so as to avoid the high-temperature and high-pressure refrigerant after compression from entering the mounting cavity 101 in the casing 100, when the second cylinder 110 is in compression, the gas pressure in the mounting cavity 101 is lower than the gas pressure in the compression cavity, including the gas pressures in the first compression cavity 107 and the second compression cavity 111, the mounting cavity 101 forms a low-pressure cavity.

[0038] In the preferred embodiment, the rotor compressor further comprises an oil delivery mechanism 300, which comprises an oil storage pool 114, an oil inlet 301, a pump oil cavity 302, a pump oil vane 303, an oil throwing hole 304 and a gas-liquid separator 305. The oil storage pool 114 is arranged in the casing 100, the oil inlet 301, the pump oil cavity 302, the pump oil vane 303 and the oil throwing hole 304 are arranged on the crankshaft 103, the oil inlet 301 is in communication with the oil storage pool 114, the pump oil cavity 302 is in communication with the oil inlet 301, the pump oil vane 303 is in driving connection with the crankshaft 103, the pump oil vane 303 is arranged in the pump oil cavity 302, one end of the oil throwing hole 304 is in communication with the pump oil cavity 302, the cylinder and the radial end face of the piston 104 are in clearance fit, and the clearance of the two is in communication with the other end of the oil throwing hole 304, the oil throwing hole 304 is used for delivering lubricating oil into the compression chamber, and the gas-liquid separator 305 is arranged between the input end of the exhaust member 202 and the exhaust port of the compression chamber. The gas-liquid separator 305 separates the lubricating oil and the refrigerant discharged from the exhaust port, and delivers the lubricating oil back into the delivery oil storage pool 114. During operation, the crankshaft 103 rotates to drive the pump oil vane 303 to rotate, and the lubricating oil in the pump oil cavity 302 is pumped into the pump oil cavity 302, the pump oil cavity 302 is thrown to the radial end face clearance of the cylinder and the piston 104, and then enters the compression chamber in the cylinder. If it is a second compression chamber 111 mode of two cylinders, the lubricating oil is pumped into the first compression chamber 107, and then the lubricating oil can be delivered into each gas chamber and the second compression chamber 111 chamber together with the refrigerant; if it is a parallel compression mode of two cylinders, after the lubricating oil is thrown out by the oil throwing hole 304, the lubricating oil is pumped into the first compression chamber 107 and the second compression chamber 111 chamber, respectively.

[0039] In the preferred embodiment, a gas-liquid separation cavity 212 is further arranged between the input end of the exhaust member 202 and the exhaust port of the compression chamber, the gas-liquid separation cavity 212 is in communication with the exhaust member 202 and the compression chamber, respectively, and the gas pressure of the gas-liquid separation cavity 212 is higher than that of the oil storage pool 114; the lubricating oil can be accelerated to flow to the oil storage pool 114 under the gas pressure, so as to ensure that the lubricating oil does not stay for too long in the high-temperature environment to accelerate carbonization decomposition, and also to accelerate heat dissipation of the cylinder, the sliding vane 105, the piston 104 and the partition plate 216 and the like.

[0040] In the preferred embodiment, the gas-liquid separator 305 comprises a filter core 306, an oil outlet 307, an oil outlet channel 308, an oil outlet core shaft 309 and a core shaft mounting seat 310, the upper end opening of the oil outlet channel 308 is communicated with the gas-liquid separation cavity 212, the upper end opening of the oil outlet channel 308 is lower than the input end of the exhaust member 202, the lower end opening of the oil outlet channel 308 is communicated with the oil storage pool 114, the filter core 306 is installed at the upper end opening of the oil outlet channel 308, the filter core 306 is protruded upward compared with the bottom wall of the gas-liquid separation cavity 212, the oil outlet core shaft 309 and the core shaft mounting seat 310 are gap-fitted and both are arranged in the oil outlet channel 308, both are located below the filter core 306 and are correspondingly arranged with the output end of the filter core 306, the gap of the oil outlet core shaft 309 and the core shaft mounting seat 310 is communicated with the oil outlet channel 308. The filter core 306 is a high-density microporous filter structure, the size of the filter pores thereon is designed to be less than 0.005 mm, so as to be able to filter the impurities and foreign matters in the lubricating oil after sedimentation.

[0041] In the preferred embodiment, the mounting cavity 101 is arranged in the casing 100, the oil storage pool 114 is formed by part of the mounting cavity 101, the oil storage pool 114 is located at the lower end of the casing 100, the lubricating oil is stored in the oil storage pool 114 when the refrigerant absorbs heat during refrigeration, the lubricating oil is immersed into the oil inlet 301 when the rotor compressor works; the lubricating oil is transported to the gas-liquid separation cavity 212 along the refrigerant transportation direction when the oil throwing hole 304 transports the lubricating oil into the compression cavity; the separation cavity partition 213 is arranged in the gas-liquid separation cavity 212, the separation cavity partition 213 is used for separating the gas-liquid mixture, one end of the separation cavity partition 213 is connected with one end of the inner wall of the gas-liquid separation cavity 212, the other end of the separation cavity partition 213 is freely extended and is spaced apart from the other end of the inner wall of the gas-liquid separation cavity 212. Generally, the separation cavity partition 213 is at least two, is spaced apart along the refrigerant transportation direction; one part of the separation cavity partition 213 is connected with the top wall of the gas-liquid separation cavity 212, the distance between the lower end and the bottom wall of the gas-liquid separation cavity 212 is less than one half of the height of the gas-liquid separation cavity 212; the other part of the separation cavity partition 213 is connected with the bottom wall of the gas-liquid separation cavity 212, the distance between the upper end and the top wall of the gas-liquid separation cavity 212 is less than one half of the height of the gas-liquid separation cavity 212; through the above-mentioned separation cavity partition 213, the disturbance effect on the gas-liquid mixture can be generated and the gas-liquid separation effect can be improved. The bottom wall of the gas-liquid separation cavity 212 is further provided with the downwardly concave sedimentation groove 215, the sedimentation groove 215 is used for collecting the sedimented lubricating oil; the refrigerant can be used as a heat source or a cold source after compression.

[0042] The compression cavity comprises a first compression cavity 107 and a second compression cavity 111, and the gas cavity comprises a first gas cavity 209, a second gas cavity 210 and a third gas cavity 211, the first gas cavity 209, the first compression cavity 107, the second gas cavity 210, the second compression cavity 111, a gas-liquid separation cavity 212 and the third gas cavity 211 are sequentially connected in series, the second compression cavity 111 is communicated with the gas-liquid separation cavity 212 through a separation cavity input end 220 and receives the compressed gas input by the second compression cavity 111; the lubricating oil enters the first compression cavity through an oil throwing hole, the lubricating oil and the refrigerant are sequentially transported from the first compression cavity to the second gas cavity and the gas-liquid separation cavity 212, the gas-liquid separation cavity 212 separates the lubricating oil and the refrigerant, the separated gas is transported to the third gas cavity and then discharged to the outside, and the separated lubricating oil is transported to an oil storage pool through a gas-liquid separator.

[0043] The compression cavity comprises a first compression cavity 107 and a second compression cavity 111, and the gas cavity comprises a first gas cavity 209 and a second gas cavity 210, the input end of the first compression cavity 107 and the input end of the second compression cavity 111 are respectively communicated with the output end of the first gas cavity 209, and the output end of the first compression cavity 107 and the output end of the second compression cavity 111 are respectively communicated with the input end of the second gas cavity 210. The lubricating oil enters the first compression cavity and the second compression cavity through an oil throwing hole, the lubricating oil and the refrigerant enter the gas-liquid separation cavity 212 through the first compression cavity and the second compression cavity for separation, the separated gas is transported to the second gas cavity and then discharged to the outside, and the separated lubricating oil is transported to an oil storage pool through a gas-liquid separator.

[0044] In the existing rotary compressor structure, the compressor exhaust valve is usually arranged on the end face of the upper bearing or / and the lower bearing. This structure has the advantages of simple structure and small exhaust resistance in high multiple pressure compressor structure. However, when the compressor is a low back pressure structure, the exhaust valve arranged on the end face of the upper and lower bearings will require a more reliable sealing structure for high pressure sealing to avoid high and low pressure gas leakage. In the existing multi-stage compressor technology, because the compressor body is a high multiple pressure structure, the compressor shell 100 is always in a high temperature and high pressure state during operation. The internal lubricating oil is prone to high temperature decomposition and carbonization under this condition for a long time, thereby reducing or losing the lubricating effect. At the same time, due to the limitation of the exhaust structure, part of the lubricating oil will be discharged with the high pressure refrigerant to the pipeline outside the compressor during exhaust. In order to ensure the heat exchanger efficiency and the lubricating oil can flow back into the compressor in time, an oil separator is usually arranged separately in the existing refrigeration system, which is installed between the condenser and the compressor to separate the refrigerant and the lubricating oil, and the separated lubricating oil is sent back to the compressor through the pipeline. Combined with the characteristics of the rotary compressor structure, especially the double-cylinder and multi-cylinder compressor, a middle partition plate 216 is arranged between each cylinder. The exhaust valve structure is arranged on the middle partition plate 216 structure, and the high temperature and high pressure gaseous refrigerant is directly discharged to the outside of the compressor shell 100 through the passage arranged on the cylinder or the middle partition plate 216, so that the low temperature and low pressure condition in the low back pressure compressor shell 100 is maintained. Secondly, it is ensured that there is enough lubricating oil in each compression chamber of the two-stage compressor to lubricate each part and effectively form an oil film to strengthen the sealing. In the present application, the middle partition plate 216 between each cylinder adopts a multi-piece combined structure. An exhaust cavity is designed in the combined middle partition plate 216. When the combined middle partition plate 216 is assembled into a whole exhaust channel structure, a closed exhaust passage is formed, which can directly discharge the high temperature and high pressure gaseous refrigerant to the outside of the compressor shell 100.

[0045] The application takes single machine two-stage compression as an example. When the compressor is working, low-temperature and low-pressure gaseous refrigerant is sucked into the first compression cavity 107 through the gas return pipeline. At the same time, the oil inlet system designed on the pump body also introduces lubricating oil into the working surface of each part in the first compression cavity 107 to form an oil film. Under this condition, the compressed refrigerant and part of the lubricating oil after the first compression cavity 107 are mixed together and discharged into the second gas cavity 210 channel. The second gas cavity 210 connects the exhaust port of the first compression cavity 107 and the inlet port of the second compression cavity 111. No oil-gas separation mechanism is arranged on the primary exhaust channel, and the mixed oil-gas is not separated to ensure that there is enough lubricating oil in the two-stage compression cavity for lubrication and auxiliary sealing. At this time, the mixed refrigerant is in a medium-temperature and medium-pressure state. The mixed refrigerant after the first compression cavity 107 is introduced into the suction port of the second compression cavity 111 through the primary exhaust channel and is sucked into the second compression cavity 111 for secondary compression. At this time, the second compression cavity 111 cannot be connected to the oil pool in the low-pressure cavity for oil lubrication because the internal pressure of the second compression cavity 111 is higher than the pressure inside the low-pressure cavity compressor shell 100 due to the suction of the refrigerant after the first compression cavity 107. Therefore, the lubricating oil in the second compression cavity 111 mainly comes from the mixed refrigerant after the first compression cavity 107, and thus the oil-gas separation mechanism cannot be arranged on the primary exhaust channel. The mixed refrigerant after the second compression cavity 111 forms a high-temperature and high-pressure oil-gas mixture with a temperature >100° and is discharged into the secondary exhaust channel through the two-stage exhaust valve. At this time, the mixed refrigerant is separated from the lubricating oil through the oil-gas separation mechanism in the secondary exhaust channel. The separated high-temperature and high-pressure refrigerant is introduced into the refrigeration system for heat exchange, and the separated liquid lubricating oil is returned to the low-temperature oil pool in the low-pressure cavity through the oil separation system. Compared with the traditional high-backpressure two-stage compressor, the lubricating oil in the technical structure is greatly shortened in high-temperature and high-pressure time, which ensures the full lubrication of each part of the compressor and also ensures that the lubricating oil will not continuously be in a high-temperature environment to accelerate aging and decomposition, thereby improving the service life and operating efficiency of the compressor.

[0046] On the other hand, compared with the existing technology of the rotor compressor, the application has the advantage of being applicable to the "deep cooling and rapid cooling" scene.

[0047] I. Definition and application of "deep cooling and rapid cooling" technology

[0048] "Deep cooling" refers to deep freezing, which usually involves a low-temperature range below -153°C (120K) and is distinguished from ordinary refrigeration technology (general cooling) such as refrigerators and air conditioners. "Rapid cooling" emphasizes the rapidity of the cooling process. Therefore, "deep cooling and rapid cooling" refers to a rapid cooling process at extremely low temperatures. This technology has important significance in many fields, mainly including:

[0049] 1. Material processing: In metal processing and heat treatment, cryogenic quenching technology can improve the hardness and wear resistance of materials, while reducing the risk of deformation and cracking. For example, cryogenic treatment of molds can significantly extend their service life and improve processing accuracy.

[0050] 2. Food processing: In the food industry, cryogenic quenching technology is used to quickly freeze food to preserve its nutritional content and taste. Seafood such as tuna often uses this technology for preservation.

[0051] II. Limitations of existing rotary compressors in "cryogenic quenching" applications

[0052] Primary compression rotary compressor: In cryogenic applications, due to low compression ratio and relatively low compression efficiency, it cannot meet the extremely high pressure requirement. In quenching applications, it cannot quickly compress the gas to the required pressure range, and the heat accumulation during compression leads to a decrease in efficiency. Even if multiple primary compression cylinders are connected in parallel, it cannot meet the requirements of cryogenic quenching.

[0053] Two-stage compression rotary compressor: Although it has higher compression ratio and compression efficiency, it is limited by factors such as high back pressure structure, stability of rotating operation of compression cylinder, and maximum rotating operation load. In addition, existing two-stage compression rotary compressors have not been able to well solve the problems of lubricating oil aging and cylinder sealing deterioration caused by high temperature and high pressure working conditions, and the two-stage compression rotary compressor performs poorly in cryogenic quenching. Taking the existing technology CN202883380U as a reference and analysis:

[0054] Due to the high temperature and high pressure working conditions of the lubricating oil, the compression cylinder and the refrigerant during the secondary compression, the high temperature and high pressure working conditions cause double sealing problems of the secondary compression cylinder. On the one hand, the sealing of the cylinder is reduced due to the aging of the lubricating oil. On the other hand, the compression cavity is composed of multiple partitions. During the secondary compression, the pressure in the compression cavity of the compression cylinder is high. There is a large pressure difference between the compression cavity and the inner cavity of the shell outside the compression cylinder, which causes the high-pressure refrigerant gas in the secondary compression cavity to leak into the inner cavity of the shell without reaching the expected pressure. For the above-mentioned double sealing problems of the secondary compression cylinder caused by the high temperature and high pressure working conditions, the existing technology adopts a high back pressure method in the inner cavity of the shell. Specifically, the high-pressure refrigerant gas compressed by the secondary compression cavity is discharged into the inner cavity of the shell, so that the pressure in the inner cavity of the shell is close to the expected output pressure of the secondary compression cavity, thereby reducing the pressure difference between the two and avoiding the problem that the high-pressure refrigerant gas leaks into the inner cavity of the shell without being effectively compressed by the secondary compression cavity. However, this method increases the heat exchange between the lubricating oil and the high-temperature refrigerant gas, and also causes difficulty in separating the lubricating oil and the refrigerant. For the aging problem caused by the high temperature of the lubricating oil during the secondary compression, a gas-liquid separator and a cooler need to be additionally arranged outside the closed shell to separate and cool the lubricating oil in the primary compression and the secondary compression. The specific process is as follows: the lubricating oil is usually pumped out from the oil pool inside the compressor, then sequentially passes through the primary compression, the gas-liquid separator (if arranged after the primary compression), the cooler for cooling, and then enters the secondary compression; the lubricating oil after the secondary compression also needs to pass through the cooler for secondary cooling, and finally is transported back to the oil pool in the closed shell through a pipeline for use by the compression cylinder. The above structure and processing technology can better solve the problem of aging of the lubricating oil caused by high temperature during the secondary compression, but this method increases the steps for separating and cooling the lubricating oil, and takes more time to prepare and output the same volume of equivalent compressed refrigerant gas compared with the present application, and performs worse in the effect of rapid cooling. Secondly, the existing technology needs to additionally arrange a gas-liquid separator and a cooler outside the closed shell, which increases the equipment cost, makes the equipment larger and consumes more energy.

[0055] The lubricating oil temperature needs to be strictly controlled below 80°C and the compressed gas temperature should not exceed 150°C during the operation of the compressor to prevent oil deterioration and damage to the machine body. Experiments show that the oxidation speed of the lubricating oil is multiplied by 10°C per increase. In the primary compression, the pressure of the refrigerant rises to 0.5-1.5 MPa and the temperature rises to 50-150°C; in the secondary compression, the pressure further rises to 1-2.5 MPa and the temperature can reach 100-250°C, which causes the lubricating oil to age rapidly and its performance to decline. The consequences of aging include reduced lubricating performance, accelerated part wear, blocked oil ways and cooling channels, increased risk of fire or explosion, and reduced cylinder sealing. Therefore, maintaining an appropriate temperature is crucial for the operation of the compressor.

[0056] The application can be applied to the "deep cooling and rapid cooling" scene for the following reasons: first, the compressor has good sealing performance due to the multi-piece combined structure of the partition and the middle partition and the lower lubricating oil working temperature characteristics of the application. The gas cavity design of the partition and the separation of different pressure zones further avoid the problem of gas mixing, which further improves the sealing performance of the compressor. Second, the compressor adopts a low-pressure cavity design, which makes the gas pressure in the installation cavity lower than that in the compression cavity, forming a low-pressure environment, which is beneficial to heat dissipation and reduces the operating temperature, avoiding heat exchange between the lubricating oil and the high-temperature refrigerant. Third, the above structural design optimizes the flow path of the lubricating oil and gas. The lubricating oil and the refrigerant are mixed in the primary compression chamber, and the compression is not carried out. After further compression in the secondary compression chamber, the lubricating oil and the refrigerant are separated, so the lubricating oil and the refrigerant only contact in the primary compression chamber, the secondary compression chamber and the transition cavity between the two. After the secondary compression, the gas-liquid separation structure can separate the lubricating oil from the refrigerant instantly, effectively separating the lubricating oil and the refrigerant. The time of the lubricating oil under high temperature and high pressure is generally less than 1s, reducing the residence time of the lubricating oil under high temperature and preventing carbonization decomposition.

[0057] Based on the lower lubricating oil working temperature and the low-pressure cavity characteristics of the application, the problems of lubricating oil aging and cylinder sealing performance degradation caused by high temperature and high pressure working conditions can be well solved. Under the same lubricating oil working temperature in the working state, the stability of the rotating operation of the compression cylinder of the application is higher and the maximum rotating operation load is larger. In terms of refrigeration effect, it is reflected in higher compression ratio and significantly improved compression efficiency, which can be well applied to the "deep cooling and rapid cooling" scene.

[0058] Although the embodiments of the application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be construed as limiting the application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application.

Claims

1. A rotary compressor characterized by comprising: The rotor compressor comprises a casing, a driving motor, a crankshaft, a piston and a cylinder, the driving motor and the cylinder are arranged on the casing, the driving motor is connected with the crankshaft, the driving motor drives the crankshaft to rotate, the piston is sleeved outside the crankshaft, the crankshaft drives the piston to rotate, the piston is arranged in the cylinder, and a compression chamber is formed between the piston and the cylinder; an air inlet and an air outlet are further arranged on the compression chamber and communicate with the compression chamber respectively; The rotor compressor further comprises a gas conveying mechanism, the gas conveying mechanism comprises an air inlet member and an air outlet member, an input end of the air inlet member is arranged outside the casing, an output end of the air inlet member and an air inlet of the compression chamber communicate, the air inlet member is used for conveying refrigerant to the compression chamber, and the compression chamber is used for compressing the refrigerant; an input end of the air outlet member communicates with an air outlet of the compression chamber, and an output end of the air outlet member is arranged outside the casing, and the air outlet member conveys the compressed refrigerant outside the casing; The cylinder comprises a first cylinder and a second cylinder, the first cylinder and the second cylinder are both arranged with the piston, the first cylinder and the second cylinder form a first compression chamber and a second compression chamber with the piston respectively, and the first compression chamber and the second compression chamber are used for compressing refrigerant; the gas conveying mechanism further comprises an exhaust valve and a gas cavity, the first compression chamber and the second compression chamber are connected in series through the exhaust valve and the gas cavity, and the gas pressure of gaseous refrigerant is gradually increased by the cylinder compression to form single-machine double-stage compression; An input end and an output end of the first compression chamber are respectively provided with a first air inlet and a first air outlet, an input end and an output end of the second compression chamber are respectively provided with a second air inlet and a second air outlet, the exhaust valve comprises a first exhaust valve and a second exhaust valve, the first exhaust valve is arranged at the first air outlet, and the second exhaust valve is arranged at the second air outlet; The gas cavity comprises a first gas cavity, a second gas cavity, a third gas cavity and a gas-liquid separation cavity, an input end and an output end of the first gas cavity communicate with the air inlet member and the first air inlet respectively, the first air outlet communicates with the second gas cavity, the second gas cavity communicates with the second air inlet, the second air outlet communicates with the third gas cavity, the gas-liquid separation cavity separates the gas-liquid mixture discharged from the second air outlet, the gas-liquid separation cavity conveys the separated gas to the third gas cavity, and the third gas cavity discharges the gas outside through the air outlet member; A separation cavity partition is arranged in the gas-liquid separation cavity, the separation cavity partition is used for separating the gas-liquid mixture, one end of the separation cavity partition is connected with one end of an inner wall of the gas-liquid separation cavity, and the other end of the separation cavity partition is freely extended and arranged in a spaced manner with the other end of the inner wall of the gas-liquid separation cavity. The separation cavity is divided into at least two parts and is arranged at intervals along the direction of refrigerant conveying; the upper end of one part of the separation cavity is connected to the top wall of the gas-liquid separation cavity, and the distance between the lower end and the bottom wall of the gas-liquid separation cavity is less than one half of the height of the gas-liquid separation cavity; the lower end of the other part of the separation cavity is connected to the bottom wall of the gas-liquid separation cavity, and the distance between the upper end and the top wall of the gas-liquid separation cavity is less than one half of the height of the gas-liquid separation cavity; The gas conveying mechanism further comprises a partition plate, the upper end surface of the first cylinder and the lower end surface of the second cylinder are respectively installed with the lower end surface and the upper end surface of the partition plate; the partition plate comprises an A plate, a B plate and a C plate, the first gas cavity penetrates through the A plate, the B plate and the C plate of the partition plate in sequence, the upper and lower ends of the first gas cavity are respectively extended to the second cylinder and the first cylinder, the second gas cavity penetrates through the A plate, the B plate and the C plate of the partition plate in sequence, and the third gas cavity is formed by the recess cavity between the C plate and the second cylinder; independent exhaust passages are arranged between adjacent two partition plates; When the compressor is working, low-temperature and low-pressure gaseous refrigerant is sucked into the first compression cavity, and lubricating oil is also introduced into the working surface of each part in the first compression cavity to form an oil film; The mixed oil gas is not separated on the primary exhaust passage, and the mixed-state refrigerant after the first compression cavity is introduced into the suction port of the second compression cavity through the primary exhaust passage and is sucked into the second compression cavity for secondary compression.

2. The rotary compressor of claim 1, wherein The first exhaust valve and the second exhaust valve are respectively installed on the partition plate; the partition plate, the first cylinder and the second cylinder are further sealed by lubricating oil.

3. The rotary compressor of claim 1, wherein The mounting cavity is arranged in the shell, the driving motor, the partition plate, the first cylinder and the second cylinder are arranged in the mounting cavity, the input end of the air inlet member and the output end of the air outlet member are arranged outside the mounting cavity, and the gas pressure of the mounting cavity is lower than the gas pressure of the first compression cavity and the second compression cavity when the rotor compressor is in compression work.

4. The rotary compressor of claim 1, wherein The rotor compressor further comprises an oil conveying mechanism, the oil conveying mechanism conveys lubricating oil to the first compression cavity and the second compression cavity, the lubricating oil circulates between the cylinder and the mounting cavity through the oil conveying mechanism, the refrigerant and the lubricating oil are combined in the first compression cavity, the output end of the second compression cavity is provided with a gas-liquid separator, the gas-liquid separator separates the refrigerant and the lubricating oil and conveys the lubricating oil back into the mounting cavity.

5. The rotary compressor of claim 1, wherein The rotor compressor further comprises an oil delivery mechanism, the oil delivery mechanism comprising an oil storage pool, an oil inlet, an oil pumping cavity, an oil pumping vane, an oil throwing hole and a gas-liquid separator, the oil storage pool is arranged in the casing, the oil inlet, the oil pumping cavity, the oil pumping vane and the oil throwing hole are arranged on the crankshaft, the oil inlet is communicated with the oil storage pool, the oil pumping cavity is communicated with the oil inlet, the oil pumping vane is drivingly connected with the crankshaft, the oil pumping vane is arranged in the oil pumping cavity, one end of the oil throwing hole is communicated with the oil pumping cavity, the cylinder is clearance-fitted with the radial end face of the piston, and the clearance of the cylinder and the piston is communicated with the other end of the oil throwing hole, the oil throwing hole is used for delivering lubricating oil into the compression chamber, the gas-liquid separator is arranged between the input end of the exhaust member and the exhaust port of the compression chamber, the gas-liquid separator separates the lubricating oil and the refrigerant discharged from the exhaust port, and delivers the lubricating oil back into the oil storage pool.

6. The rotary compressor of claim 5, wherein A gas-liquid separation cavity is further arranged between the input end of the exhaust member and the exhaust port of the compression chamber, the gas-liquid separation cavity is communicated with the exhaust member and the compression chamber respectively, and the gas pressure of the gas-liquid separation cavity is higher than the gas pressure of the oil storage pool. The gas-liquid separator comprises a filter core, an oil outlet, an oil outlet channel, an oil outlet core shaft and a core shaft mounting seat, the upper end opening of the oil outlet channel is communicated with the gas-liquid separation cavity, the upper end opening of the oil outlet channel is lower than the input end of the exhaust member, the lower end opening of the oil outlet channel is communicated with the oil storage pool, the filter core is mounted at the upper end opening of the oil outlet channel, the filter core is protruded upward compared with the bottom wall of the gas-liquid separation cavity, the oil outlet core shaft and the core shaft mounting seat are clearance-fitted and arranged in the oil outlet channel, and are located below the filter core and correspondingly arranged at the output end of the filter core, and the clearance of the oil outlet core shaft and the core shaft mounting seat is communicated with the oil outlet channel.

7. The rotary compressor of claim 6, wherein An installation cavity is arranged in the casing, the oil storage pool is formed by part of the installation cavity, the oil storage pool is located at the lower end of the casing, the oil storage pool stores lubricating oil, and the lubricating oil immerses the oil inlet when the rotor compressor works; when the oil throwing hole delivers lubricating oil into the compression chamber, the lubricating oil is delivered to the gas-liquid separation cavity along the delivery direction of the refrigerant; the bottom wall of the gas-liquid separation cavity is further provided with a downwardly recessed sedimentation groove, and the sedimentation groove is used for collecting the settled lubricating oil.

8. The rotary compressor of claim 7, wherein The first gas chamber, the first compression chamber, the second gas chamber, the second compression chamber, the gas-liquid separation chamber and the third gas chamber are sequentially connected in series, the lubricating oil enters the first compression chamber through the oil throwing hole, the lubricating oil and the refrigerant are delivered from the first compression chamber to the second gas chamber, the second compression chamber and the gas-liquid separation chamber, the gas-liquid separation chamber separates the lubricating oil and the refrigerant, the separated gas is delivered to the third gas chamber and then discharged to the outside, and the separated lubricating oil is delivered to the oil storage pool through the gas-liquid separator.

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