Rotor compressor

Abstract

The utility model belongs to the technical field of compressors, and particularly relates to a rotor compressor. The rotor compressor further comprises an air conveying mechanism, the air conveying mechanism comprises an air inlet piece and an air exhaust piece, the input end of the air inlet piece is arranged outside the machine shell, and the output end of the air inlet piece communicates with an air inlet of the compression cavity. The air inlet piece is used for conveying a refrigerant to the compression cavity, and the compression cavity is used for compressing the refrigerant; the input end of the exhaust part communicates with the exhaust port of the compression cavity, the output end of the exhaust part is arranged outside the machine shell, and the exhaust part conveys the compressed refrigerant out of the machine shell. According to the rotor compressor provided by the utility model, the heat dissipation and output efficiency of the compressor can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressors, and in particular relates to a rotor compressor. Background Art

[0002] CN114294232A discloses an oil separation device and a rotary compressor for reducing oil discharge rate. The oil separation device includes a guide part for changing the direction of airflow and a fixed part connected to the muffler. The guide part is composed of an arc surface and an extended rib. The arc surface is extended along the outer circumference of the muffler exhaust hole to the top of the muffler exhaust hole, and the extended rib is connected with the edge of the arc surface. The fixed part is used to connect the arc surface and the extended rib with the outer surface of the muffler. The airflow discharged from the muffler exhaust hole is discharged horizontally through the channel formed by the arc surface and the extended rib. The muffler exhaust hole is equipped with an oil separation device for reducing oil discharge rate. Under the action of the oil separation device, the airflow direction is changed and discharged into the cylinder, and then passes through the motor and is discharged into the refrigeration system through the exhaust pipe. The existing design discharges the compressed high-temperature and high-pressure refrigerant gas and lubricating oil mixture into the cylinder (i.e., the casing), which will seriously affect the heat dissipation and output efficiency of the compressor. On the other hand, it is normal for the cylinder to be at high temperature and high pressure when the compressor is working. Under this condition, the viscosity of the compressor lubricating oil decreases, and it is easy to carbonize and decompose, losing its lubricating effect. Utility Model Content

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

[0004] The utility model provides a rotary compressor, the rotary 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 to 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, a compression chamber is formed between the piston and the cylinder; the compression chamber is also provided with an air inlet and an exhaust port respectively connected thereto;

[0005] The rotary compressor also includes an air delivery mechanism, which includes an air intake member and an exhaust member, wherein the input end of the air intake member is arranged outside the casing, and the output end of the air intake member is connected to the air intake port of the compression chamber; the air intake member is used to deliver the refrigerant to the compression chamber, and the compression chamber is used to compress the refrigerant; the input end of the exhaust member is connected to the exhaust port of the compression chamber, and the output end of the exhaust member is arranged outside the casing, and the exhaust member delivers the compressed refrigerant to the outside of the casing.

[0006] Preferably, the cylinder includes a first cylinder and a second cylinder, the pistons are disposed in the first cylinder and the second cylinder, the first cylinder and the second cylinder respectively form a first compression chamber and a second compression chamber with the piston, the first compression chamber and the second compression chamber are used to compress the refrigerant; the gas transmission mechanism also includes an exhaust valve and an air cavity, the first compression chamber and the second compression chamber are connected in series or in parallel through the exhaust valve and the air cavity.

[0007] Preferably, the input end and the output end of the first compression chamber are respectively provided with a first air inlet and a first exhaust port, the input end and the output end of the second compression chamber are respectively provided with a second air inlet and a second exhaust port, the exhaust valve includes a first exhaust valve and a second exhaust valve, and the first exhaust valve and the second exhaust valve are also respectively arranged corresponding to the first exhaust port and the second exhaust port; the air transmission mechanism also includes a partition, 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, the air cavity passes through the partition, the air cavity is connected 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.

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

[0009] The air cavity includes a first air cavity, a second air cavity and a gas-liquid separation cavity, the input end of the first air cavity is respectively connected to the air intake member, the output end of the first air cavity is respectively connected to the first air intake port and the second air intake port, the first exhaust port and the second exhaust port are respectively connected to the second air cavity, 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 cavity is connected to the output end of the second air cavity and separates the gas-liquid mixture discharged from the first exhaust port and the second exhaust port, the gas-liquid separation cavity transports the separated gas to the exhaust member, an oil storage tank is arranged in the casing, and the gas-liquid separation cavity transports the separated lubricating oil to the oil storage tank.

[0010] Preferably, the rotary compressor also includes a driving motor, which is arranged on the casing, the driving motor is connected to the crankshaft, and the driving motor drives the crankshaft to rotate; an installation cavity is arranged in the casing, the driving motor, the partition, the first cylinder and the second cylinder are arranged in the installation cavity, the input end of the air intake member and the output end of the exhaust member are both arranged outside the installation cavity, and when the rotary compressor is in compression operation, the air pressure in the installation cavity is lower than the air pressure in the compression cavity.

[0011] Preferably, the rotary compressor also includes an oil delivery mechanism, which includes an oil storage tank, an oil inlet, an oil pumping chamber, an oil pumping blade, an oil throwing hole and a gas-liquid separator. The oil storage tank is arranged in the casing, and the oil inlet, the oil pumping chamber, the oil pumping blade and the oil throwing hole are arranged on the crankshaft. The oil inlet is communicated with the oil storage tank, the oil pumping chamber and the oil inlet are communicated, the oil pumping blade is connected to the crankshaft driving, the oil pumping blade is arranged in the oil pumping chamber, one end of the oil throwing hole is communicated with the oil pumping chamber, the cylinder and the piston radial end face clearance match, and the gap between the two is connected with the other end of the oil throwing hole, the oil throwing hole is used to deliver lubricating oil to the compression chamber, and 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 refrigerant discharged from the exhaust port, and delivers the lubricating oil back to the delivery oil storage tank.

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

[0013] Preferably, the gas-liquid separator includes a filter element, 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 connected to the gas-liquid separation chamber, 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 connected to the oil storage tank, the filter element is installed at the upper end opening of the oil outlet channel, the filter element protrudes upward compared to the bottom wall of the gas-liquid separation chamber, the oil outlet core shaft and the core shaft mounting seat are gap-fitted and both are arranged in the oil outlet channel, both are located below the filter element and are arranged corresponding to the output end of the filter element, and the gap between the oil outlet core shaft and the core shaft mounting seat is connected to the oil outlet channel.

[0014] Preferably, an installation cavity is provided in the casing, and the oil storage tank is formed by part of the installation cavity. The oil storage tank is located at the lower end of the casing, and the oil storage tank stores lubricating oil. When the rotary compressor is working, the lubricating oil immerses the oil inlet; when the oil-throwing hole transports the lubricating oil to the compression chamber, the lubricating oil is transported to the gas-liquid separation chamber along the refrigerant transport direction; a separation chamber partition is provided in the gas-liquid separation chamber, and the separation chamber partition is used to separate the gas-liquid mixture, one end of the separation chamber partition is connected to one end of the inner wall of the gas-liquid separation chamber, and the other end of the separation chamber partition extends freely and is spaced from the other end of the inner wall of the gas-liquid separation chamber, and the bottom wall of the gas-liquid separation chamber is also provided with a downwardly concave sedimentation tank, and the sedimentation tank is used to collect and store the settled lubricating oil.

[0015] Preferably, the compression chamber includes a first compression chamber and a second compression chamber, and the air chamber includes a first air chamber, a second air chamber and a third air chamber. The first air chamber, the first compression chamber, the second air chamber, the second compression chamber, the gas-liquid separation chamber and the third air chamber are connected in series in sequence. The lubricating oil enters the first compression chamber through the oil-throwing hole, and the lubricating oil and the refrigerant are transported from the first compression chamber to the second air chamber and the gas-liquid separation chamber in sequence. The gas-liquid separation chamber separates the lubricating oil and the refrigerant, and the separated gas is transported to the third air chamber and then discharged to the outside. The separated lubricating oil is transported to the oil storage tank via the gas-liquid separator.

[0016] The compression chamber includes a first compression chamber and a second compression chamber, and the air chamber includes a first air chamber and a second air chamber. The input end of the first compression chamber and the input end of the second compression chamber are respectively connected to the output end of the first air chamber, and the output end of the first compression chamber and the output end of the second compression chamber are respectively connected to the input end of the second air chamber. The lubricating oil enters the first compression chamber and the second compression chamber through the oil-throwing hole, and the lubricating oil and the refrigerant enter the gas-liquid separation chamber from the first compression chamber and the second compression chamber to be separated. The separated gas is transported to the second air chamber and then discharged to the outside. The separated lubricating oil is transported to the oil storage tank via the gas-liquid separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other purposes, features and advantages of the present invention will become clearer through a more specific description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals indicate the same parts in all the accompanying drawings, and the accompanying drawings are not deliberately scaled to the actual size, but the focus is on illustrating the main purpose of the present invention.

[0018] Figure 1 A schematic diagram of the structure of a two-cylinder two-stage compression rotary compressor provided in an embodiment;

[0019] Figure 2 for Figure 1 Partial schematic diagram;

[0020] Figure 3 A schematic diagram of the structure of a rotary compressor with two cylinders connected in parallel to perform one-stage compression provided by an embodiment;

[0021] Figure 4 A schematic diagram of the structure of a rotor compressor with an oil delivery mechanism provided in an embodiment;

[0022] Figure 5 A schematic diagram of the structure of a rotor compressor provided in an embodiment;

[0023] Figure 6 for Figure 5 Top view;

[0024] Figure 7 for Figure 5 Sectional view;

[0025] Figure 8 A schematic diagram of the structure of a rotor compressor provided in an embodiment;

[0026] Fig. 9 for Figure 8 AA section view.

[0027] chassis 100 Second valve body mounting end 208 Mounting cavity 101 First air cavity 209 Drive motor 102 Second air chamber 210 Crankshaft 103 The third air chamber 211 piston 104 Gas-liquid separation chamber 212 Slide 105 Separation chamber partition 213 First cylinder 106 Sedimentation tank 215 First compression chamber 107 Partition 216 First air inlet 108 A-Board 217 First exhaust port 109 B Plate 218 Second cylinder 110 C-Board 219 Second compression chamber 111 Separation chamber input 220 Second air inlet 112 Oil transportation agency 300 Second exhaust port 113 Oil inlet 301 Oil storage tank 114 Pump oil chamber 302 Lower cylinder bottom cover 115 Pump oil blade 303 Gas transmission mechanism 200 Oil throw hole 304 Air intake 201 Gas-Liquid Separator 305 Exhaust parts 202 Filter element 306 First exhaust valve 203 Oil outlet 307 First valve plate 204 Oil outlet channel 308 First valve body installation end 205 Oil outlet shaft 309 Second exhaust valve 206 Mandrel mounting seat 310 Second valve plate 207 DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the relevant drawings.

[0029] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used herein are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] Please refer to Figure 1-Figure 9The utility model provides a rotary compressor, which includes a housing 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 housing 100, the driving motor 102 is connected to 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 chamber is formed between the piston 104 and the cylinder; the compression chamber is also provided with an air inlet and an exhaust port respectively connected thereto;

[0032] The rotary compressor also includes an air delivery mechanism 200, which includes an air inlet 201 and an air exhaust 202. The input end of the air inlet 201 is arranged outside the casing 100, and the output end of the air inlet 201 is connected to the air inlet of the compression chamber; the air inlet 201 is used to deliver the refrigerant to the compression chamber, and the compression chamber is used to compress the refrigerant; the input end of the exhaust 202 is connected to the exhaust port of the compression chamber, and the output end of the exhaust 202 is arranged outside the casing 100, and the exhaust 202 delivers the compressed refrigerant to the outside of the casing 100. The rotary compressor provided by the utility model can improve the heat dissipation and output efficiency of the compressor. The exhaust 202 can adopt an exhaust pipe or an exhaust valve and a combination thereof, and the air inlet 201 can adopt an air inlet pipe or an air inlet valve and a combination thereof. How a rotary compressor compresses refrigerant for refrigeration is a prior art.

[0033] In a preferred embodiment, the cylinder includes a first cylinder 106 and a second cylinder 110, and the first cylinder 106 and the second cylinder 110 are both provided with a piston 104. The first cylinder 106 and the second cylinder 110 respectively form a first compression chamber 107 and a second compression chamber 111 with the piston 104, and the first compression chamber 107 and the second compression chamber 111 are used to compress the refrigerant; the gas transmission mechanism 200 also includes an air valve and an air cavity, and the first compression chamber 107 and the second compression chamber 111 are connected in series or in parallel through the air valve and the air cavity. Through the gas valve and gas cavity, the compressor can have multiple cylinders in parallel or in series to compress the gaseous refrigerant. In parallel, the gaseous refrigerant compressed by the parallel cylinders is merged together. In series, the gas pressure of the gaseous refrigerant is gradually increased by the cylinder compression to form a single machine two-stage compression. For example, when the first compression chamber 107 and the second compression chamber 111 are connected in series, the first compression chamber 107 preliminarily compresses the gaseous refrigerant, and then the second compression chamber 111 further compresses the preliminarily compressed gaseous refrigerant to obtain a gaseous refrigerant with a higher pressure. This makes the compressor more widely applicable and better in function.

[0034] In a preferred embodiment, the input end and output end of the first compression chamber 107 are respectively provided with a first air inlet 108 and a first exhaust port 109, the input end and output end of the second compression chamber 111 are respectively provided with a second air inlet 112 and a second exhaust port 113, the gas valve includes a first exhaust valve 203 and a second exhaust valve 206, and the first exhaust valve 203 and the second exhaust valve 206 are also respectively provided corresponding to the first exhaust port 109 and the second exhaust port 113; the gas delivery mechanism 200 also includes a partition 216, the upper end surface of the first cylinder 106 and the lower end surface of the second cylinder 110 are respectively provided with the lower end surface and the upper end surface of the partition 216, the air cavity penetrates the partition 216, the air cavity is connected with the first compression chamber 107 and the second compression chamber 111, and the first exhaust valve 203 and the second exhaust valve 206 are respectively provided on the partition 216. The partition 216 facilitates the installation of the cylinders, and at the same time, the air cavity is provided in the partition 216, so that the gas connection between the cylinders is more convenient. Further, the partition plate 216, the first cylinder 106 and the second cylinder 110 are fixed by fasteners, such as by studs. Further, a lower cylinder bottom cover 115 is provided at the lower end of the first cylinder 106.

[0035] Please refer to Figure 1 and Figure 2In the preferred embodiment, two cylinders are compressed in series, and the air chamber includes a first air chamber 209, a second air chamber 210, a third air chamber 211 and a gas-liquid separation chamber 212. The input end and the output end of the first air chamber 209 are respectively connected to the air inlet 201 and the first air inlet 108, the first exhaust port 109 is connected to the second air chamber 210, the first exhaust valve 203 is arranged at the first exhaust port 109, the second air chamber 210 is connected to the second air inlet 112, the second exhaust port 113 is connected to the third air chamber 211, the second exhaust valve 206 is arranged at the second exhaust port 113, and the output end of the third air chamber 211 is connected to the exhaust member 202. The gas-liquid separation chamber 212 separates the gas-liquid mixture discharged from the second exhaust port, and the gas-liquid separation chamber 212 transports the separated gas to the third air chamber, and the third air chamber 211 discharges it to the outside through the exhaust member 202; the gas-liquid separation chamber 212 transports the separated lubricating oil to the oil storage tank 114. The gray arrow in the figure indicates the flow direction of the refrigerant. Further, the partition 216 includes an A plate 217, a B plate 218 and a C plate 219, the first air cavity 209 sequentially penetrates the A plate 217, the B plate 218 and the C plate 219 of the partition 216, the upper and lower ends of the first air cavity 209 extend to the second cylinder 110 and the first cylinder 106 respectively, the second air cavity 210 sequentially penetrates the A plate 217, the B plate 218 and the C plate 219 of the partition 216, and the third air cavity 211 is formed by the concave cavity between the C plate 219 and the second cylinder 110. Further, the first exhaust valve 203 includes a first valve body mounting end 205 and a first valve plate 204, the first valve plate 204 has a free end that can be movably provided with a first exhaust port 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 second exhaust port 113 is movably provided at a free end of the second valve plate 207 . The second valve body mounting end 208 is fixed on the C plate 219 .

[0036] Please refer to Figure 3In the preferred embodiment, two cylinders are compressed in parallel, and the air chamber includes a first air chamber 209, a second air chamber 210, and a gas-liquid separation chamber 212. The input end of the first air chamber 209 is respectively connected to the air inlet 201, and the output end of the first air chamber 209 is respectively connected to the first air inlet 108 and the second air inlet 112. The first exhaust port 109 and the second exhaust port 113 are respectively connected to the second air chamber 210. The first exhaust valve 203 is arranged at the first exhaust port 109, and the second exhaust valve 206 is arranged at the second exhaust port 113. The output end of the second air chamber 210 is connected to the exhaust member 202. The gas-liquid separation chamber 212 separates the gas-liquid mixture discharged from the first exhaust port and the second exhaust port, and the gas-liquid separation chamber 212 transports the separated gas to the second air chamber. The output end of the second air chamber is connected to the exhaust member, and the second air chamber 210 discharges it to the outside through the exhaust member 202; the gas-liquid separation chamber 212 transports the separated lubricating oil to the oil storage tank 114. The gray arrow in the figure indicates the flow direction of the refrigerant. The partition 216 includes an A plate 217 and a B plate 218. The first air cavity 209 sequentially penetrates the A plate 217 and the B plate 218 of the partition 216 and extends to the second cylinder 110 and the first cylinder 106 at both ends. The second air cavity 210 sequentially penetrates the A plate 217 and the B plate 218 of the partition 216. Further, the first exhaust valve 203 includes a first valve body mounting end 205 and a first valve plate 204. The first valve plate 204 has a first exhaust port 109 movably disposed at its free end. 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 second valve plate 207 has a second exhaust port 113 movably disposed at its free end. 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 the same, it is only necessary to divide the traditional middle partition 216 into two combined blocks to achieve the exhaust of the middle partition 216. When the upper and lower cylinders of the compressor are two-stage compression, the exhaust pressures of the upper and lower cylinders are different, and the final exhaust passage cannot be shared. Therefore, it is necessary to decompose the original middle partition 216 structure into three combined blocks, and set independent exhaust passages between each two blocks to avoid cross-flow in different pressure ranges.

[0037] In a preferred embodiment, an installation cavity 101 is set in the casing 100, and the driving motor 102, the partition 216, the first cylinder 106 and the second cylinder 110 are set in the installation cavity 101, and the input end of the air intake member 201 and the output end of the exhaust member 202 are both set outside the installation cavity 101 to prevent the compressed high-temperature and high-pressure refrigerant from entering the installation cavity 101 in the casing 100. When the second cylinder 110 is in compression operation, the air pressure in the installation cavity 101 is lower than the air pressure of the compression cavity, including being lower than the air pressure of the first compression cavity 107 and the second compression cavity 111, and the installation cavity 101 forms a low-pressure cavity.

[0038] In a preferred embodiment, the rotary compressor further includes an oil delivery mechanism 300, which includes an oil reservoir 114, an oil inlet 301, an oil pumping cavity 302, an oil pumping blade 303, an oil throwing hole 304 and a gas-liquid separator 305. The oil reservoir 114 is disposed in the casing 100, and the oil inlet 301, the oil pumping cavity 302, the oil pumping blade 303 and the oil throwing hole 304 are disposed on the crankshaft 103. The oil inlet 301 is communicated with the oil reservoir 114, the oil pumping cavity 302 is communicated with the oil inlet 301, and the oil pumping blade 303 is communicated with the crankshaft 103. 03 driving connection, the oil pumping blade 303 is arranged in the oil pumping chamber 302, one end of the oil throwing hole 304 is connected with the oil pumping chamber 302, the radial end surface clearance of the cylinder and the piston 104 is matched, and the clearance between the two is connected with the other end of the oil throwing hole 304, and the oil throwing hole 304 is used to transport the lubricating oil to 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, and the gas-liquid separator 305 separates the lubricating oil and the refrigerant discharged from the exhaust port, and transports the lubricating oil back to the transport oil storage tank 114. During operation, the crankshaft 103 rotates to drive the oil pumping blade 303 to rotate, and the lubricating oil in the oil pumping chamber 302 is pumped to the oil pumping chamber 302, and the oil pumping chamber 302 is thrown to the radial end surface clearance of the cylinder and the piston 104, and then enters the compression chamber in the cylinder. If it is the second compression chamber 111 mode of two cylinders, the lubricating oil is pumped to the first compression chamber 107, and then the lubricating oil can be transported to each air chamber and the second compression chamber 111 together with the refrigerant; if it is the parallel compression mode of two cylinders, after the oil-throwing hole 304 throws out the lubricating oil, the lubricating oil is pumped to the first compression chamber 107 and the second compression chamber 111 respectively.

[0039] In a preferred embodiment, a gas-liquid separation chamber 212 is further provided between the input end of the exhaust member 202 and the exhaust port of the compression chamber. The gas-liquid separation chamber 212 is connected to the exhaust member 202 and the compression chamber respectively. The air pressure of the gas-liquid separation chamber 212 is higher than the air pressure of the oil storage tank 114. The lubricating oil can be accelerated to flow to the oil storage tank 114 under the air pressure, ensuring that the lubricating oil will not stay in a high temperature environment for too long and accelerate carbonization and decomposition. At the same time, the heat dissipation of components such as the cylinder, the slide 105, the piston 104 and the partition 216 can also be accelerated.

[0040] In a preferred embodiment, the gas-liquid separator 305 includes a filter element 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 connected to the gas-liquid separation chamber 212, the upper end opening of the oil outlet channel 308 is lower than the input end of the exhaust member 202, and the lower end opening of the oil outlet channel 308 is connected to the oil storage tank 114. The filter element 306 is installed at the upper end opening of the oil outlet channel 308. The filter element 306 protrudes upward compared to the bottom wall of the gas-liquid separation chamber 212. The oil outlet core shaft 309 and the core shaft mounting seat 310 are clearance-matched and both are arranged in the oil outlet channel 308. Both are located below the filter element 306 and are arranged corresponding to the output end of the filter element 306. The gap between the oil outlet core shaft 309 and the core shaft mounting seat 310 is connected to the oil outlet channel 308. The filter element 306 is a high-density microporous filter structure, and the size of the filter pores thereon is designed to be less than 0.005 mm, so that it can filter out impurities and foreign matter in the settled lubricating oil.

[0041] In a preferred embodiment, an installation cavity 101 is provided in the casing 100, and an oil storage tank 114 is formed by a portion of the installation cavity 101. The oil storage tank 114 is located at the lower end of the casing 100. When cooling, the refrigerant absorbs heat, and the oil storage tank 114 stores lubricating oil. When the rotary compressor is working, the lubricating oil immerses the oil inlet 301; when the oil-throwing hole 304 transports the lubricating oil into the compression chamber, the lubricating oil is transported to the gas-liquid separation chamber 212 along the refrigerant transport direction; a separation chamber partition 213 is provided in the gas-liquid separation chamber 212, and the separation chamber partition 213 is used to separate the gas-liquid mixture, and one end of the separation chamber partition 213 is connected to one end of the inner wall of the gas-liquid separation chamber 212, and the other end of the separation chamber partition 213 extends freely and is spaced apart from the other end of the inner wall of the gas-liquid separation chamber 212. Generally, there are at least two separation chamber partitions 213, which are arranged at intervals along the refrigerant conveying direction; the upper end of one part of the separation chamber partitions 213 is connected to the top wall of the gas-liquid separation chamber 212, and the distance between the lower end and the bottom wall of the gas-liquid separation chamber 212 is less than half of the height of the gas-liquid separation chamber 212; the lower end of another part of the separation chamber partitions 213 is connected to the bottom wall of the gas-liquid separation chamber 212, and the distance between the upper end and the top wall of the gas-liquid separation chamber 212 is less than half of the height of the gas-liquid separation chamber 212; the above-mentioned separation chamber partitions 213 can produce a turbulent flow effect on the gas-liquid mixture and improve the gas-liquid separation effect. The bottom wall of the gas-liquid separation chamber 212 is also provided with a downwardly concave sedimentation tank 215, which is used to collect and store the settled lubricating oil; the refrigerant can be used as a heat source or a cold source after compression.

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

[0043] The compression chamber includes a first compression chamber 107 and a second compression chamber 111, and the gas chamber includes a first gas chamber 209 and a second gas chamber 210. The input end of the first compression chamber 107 and the input end of the second compression chamber 111 are respectively connected to the output end of the first gas chamber 209, and the output end of the first compression chamber 107 and the output end of the second compression chamber 111 are respectively connected to the input end of the second gas chamber 210. Lubricating oil enters the first compression chamber and the second compression chamber from the oil-slinging hole, and the lubricating oil and the refrigerant enter the gas-liquid separation chamber 212 from the first compression chamber and the second compression chamber to be separated. The separated gas is transported to the second gas chamber and then discharged to the outside, and the separated lubricating oil is transported to the oil storage tank via the 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 the high-pressure compressor structure. However, when the compressor is a low back pressure structure, the exhaust valve is arranged on the upper and lower bearing end faces, which requires the two ends to have a more reliable sealing structure to achieve high-pressure sealing, so as to avoid cross-flow and leakage between high and low pressures. In the existing multi-stage compressor technology, because the compressor body is a high-pressure structure, the compressor shell 100 is always in a high-temperature and high-pressure state during operation, and the internal lubricating oil is easy to decompose and carbonize 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 into the pipeline outside the compressor together with the high-pressure refrigerant during exhaust. In order to ensure that the efficiency of the heat exchanger is not reduced and the lubricating oil can flow back into the compressor in time, an oil separator is separately set 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 two-cylinder and multi-cylinder compressors are provided with a middle partition 216 between each cylinder, the utility model sets the exhaust valve structure on the middle partition 216 structure, and directly guides the high-temperature and high-pressure gaseous refrigerant to the outside of the compressor shell 100 through the passage provided on the cylinder or the middle partition 216, thereby maintaining the low temperature and low pressure conditions inside the low back pressure compressor shell 100 unchanged. Secondly, ensure that there is enough lubricating oil in each compression chamber of the two-stage compressor to lubricate each component and effectively form an oil film to strengthen the seal. In the utility model, the middle partition 216 between each cylinder adopts a multi-piece combined structure, and an exhaust cavity is designed in the middle of the combined middle partition 216. When the combined middle partition 216 is assembled into an integral exhaust groove to form a closed exhaust passage, the high-temperature and high-pressure gaseous refrigerant can be directly guided out of the compressor shell 100.

[0045] In the present invention, taking a single-machine two-stage compression as an example, when the compressor is working, the low-temperature and low-pressure gaseous refrigerant is sucked into the first compression chamber 107 through the return air pipeline. At the same time, the oil inlet system designed on the pump body also introduces lubricating oil into the working surfaces of various parts in the first compression chamber 107 to form an oil film. Under this condition, as the compression chamber rotates and compresses, the refrigerant and part of the lubricating oil after passing through the first compression chamber 107 are mixed and discharged together and enter the second air chamber 210 channel. The second air chamber 210 is connected to the exhaust port of the first compression chamber 107 and the air inlet of the second compression chamber 111. No oil-gas separation mechanism is set on the first-stage exhaust channel, and the mixed oil and gas are not separated to ensure that there is enough lubricating oil in the secondary compression chamber for lubrication and auxiliary sealing. At this time, the mixed refrigerant is in a medium-temperature and medium-pressure state. The mixed refrigerant after passing through the first compression chamber 107 is introduced into the air intake port of the second compression chamber 111 through the primary exhaust passage and is sucked into the second compression chamber 111 for secondary compression. (At this time, the second compression chamber 111 sucks the refrigerant after passing through the first compression chamber 107, so its internal pressure is higher than the pressure inside the low-pressure chamber compressor shell 100, so it is impossible to set a connecting oil path to connect the oil pool in the low chamber to supply oil and lubricate the second compression chamber 111. Therefore, the lubricating oil in the second compression chamber 111 mainly comes from the mixed refrigerant after passing through the first compression chamber 107. Therefore, an oil-gas separation mechanism cannot be set on the primary exhaust passage. The mixed refrigerant forms high-temperature (temperature>100°) and high-pressure oil and gas after passing through the second compression chamber 111. The mixture is discharged through the secondary exhaust valve into the secondary exhaust channel. At this time, the mixed refrigerant is separated from the lubricating oil and the refrigerant through the oil-gas separation mechanism in the secondary exhaust channel. The separated high-temperature and high-pressure refrigerant enters the refrigeration system through the exhaust pipe for heat exchange. At the same time, the separated liquid lubricating oil flows back to the low-temperature oil pool in the low-pressure chamber through the oil separation system. Compared with the traditional high back pressure two-stage compressor in which the lubricating oil is always in a high-temperature and high-pressure environment, the time that the lubricating oil is in a high-temperature and high-pressure environment in this technical structure is greatly shortened. While ensuring that the various components of the compressor are fully lubricated, it also ensures that the lubricating oil will not be continuously in a high-temperature environment and accelerate aging and decomposition, thereby improving the service life and operating efficiency of the compressor.

[0046] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0048] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A rotary compressor, characterized in that: The rotary compressor comprises a casing, a crankshaft, a piston and a cylinder, wherein the cylinder is arranged on the casing, 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; the compression chamber is also provided with an air inlet and an air outlet respectively connected thereto; The rotary compressor further includes an air delivery mechanism, which includes an air inlet member and an air exhaust member, wherein the input end of the air inlet member is arranged outside the casing, and the output end of the air inlet member is communicated with the air inlet of the compression chamber; the air inlet member is used to deliver the refrigerant to the compression chamber, and the compression chamber is used to compress the refrigerant; the input end of the air exhaust member is communicated with the air exhaust port of the compression chamber, and the output end of the air exhaust member is arranged outside the casing, and the air exhaust member delivers the compressed refrigerant to the outside of the casing; An installation cavity is arranged in the casing, and the oil reservoir is formed by part of the installation cavity. The oil reservoir is located at the lower end of the casing, and the oil reservoir stores lubricating oil. The input end of the air intake member and the output end of the exhaust member are both arranged outside the installation cavity. When the rotary compressor is in compression operation, the air pressure of the installation cavity is lower than the air pressure of the compression cavity. A gas-liquid separation chamber is also provided between the input end of the exhaust member and the exhaust port of the compression chamber, the gas-liquid separation chamber is communicated with the exhaust member and the compression chamber respectively, the gas pressure of the gas-liquid separation chamber is higher than the gas pressure of the oil storage tank, and is used to accelerate the flow of lubricating oil to the oil storage tank; The cylinder comprises a first cylinder and a second cylinder, wherein the piston is disposed in each of the first cylinder and the second cylinder, and the first cylinder and the second cylinder respectively form a first compression chamber and a second compression chamber with the piston, wherein the first compression chamber and the second compression chamber are used to compress the refrigerant; the gas transmission mechanism further comprises an exhaust valve and an air chamber, wherein the first compression chamber and the second compression chamber are connected in series or in parallel via the exhaust valve and the air chamber; When in series compression mode, the lubricating oil is pumped to the first compression chamber, and then the lubricating oil can be delivered to each gas chamber and the second compression chamber together with the refrigerant; when in parallel compression mode, the lubricating oil is pumped to the first compression chamber and the second compression chamber respectively.

2. The rotary compressor according to claim 1, characterized in that: The input end and output end of the first compression chamber are respectively provided with a first air inlet and a first exhaust port, the input end and output end of the second compression chamber are respectively provided with a second air inlet and a second exhaust port, the exhaust valve includes a first exhaust valve and a second exhaust valve, and the first exhaust valve and the second exhaust valve are also respectively provided corresponding to the first exhaust port and the second exhaust port; the air transmission mechanism also includes a partition, 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, the air cavity passes through the partition, the air cavity is connected 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.

3. The rotary compressor according to claim 2, characterized in that: The air cavity comprises a first air cavity, a second air cavity, a third air cavity and a gas-liquid separation cavity, the input end and the output end of the first air cavity are respectively communicated with the air inlet member and the first air inlet port, the first exhaust port is communicated with the second air cavity, the first exhaust valve is arranged at the first exhaust port, the second air cavity is communicated with the second air inlet port, the second exhaust port is communicated with the third air cavity, the second exhaust valve is arranged at the second exhaust port, and the output end of the third air cavity is communicated with the gas-liquid separation cavity; the gas-liquid separation cavity separates the gas-liquid mixture discharged from the second exhaust port, the gas-liquid separation cavity transports the separated gas to the exhaust member, and the gas-liquid separation cavity transports the separated lubricating oil to the oil storage tank; or The air cavity includes a first air cavity, a second air cavity and a gas-liquid separation cavity, the input end of the first air cavity is respectively connected to the air inlet component, the output end of the first air cavity is respectively connected to the first air inlet and the second air inlet, the first exhaust port and the second exhaust port are respectively connected to the second air cavity, 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 cavity is connected to the output end of the second air cavity and separates the gas-liquid mixture discharged from the first exhaust port and the second exhaust port, the gas-liquid separation cavity transports the separated gas to the exhaust component, and the gas-liquid separation cavity transports the separated lubricating oil to the oil storage tank.

4. The rotary compressor according to claim 1, characterized in that: The rotary compressor also includes a drive motor, which is arranged on the casing and connected to the crankshaft, and drives the crankshaft to rotate; the drive motor, the partition, the first cylinder and the second cylinder are arranged in the installation cavity.

5. The rotary compressor according to claim 1, characterized in that: The rotary compressor also includes an oil delivery mechanism, which includes an oil storage tank, an oil inlet, an oil pumping chamber, an oil pumping blade, an oil throwing hole and a gas-liquid separator. The oil storage tank is arranged in the casing, and the oil inlet, the oil pumping chamber, the oil pumping blade and the oil throwing hole are arranged on the crankshaft. The oil inlet is communicated with the oil storage tank, the oil pumping chamber and the oil inlet are communicated, the oil pumping blade is connected to the crankshaft driving, the oil pumping blade is arranged in the oil pumping chamber, one end of the oil throwing hole is communicated with the oil pumping chamber, the cylinder and the piston radial end surface clearance match, and the clearance between the two is communicated with the other end of the oil throwing hole, the oil throwing hole is used to deliver the lubricating oil to the compression chamber, and 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 refrigerant discharged from the exhaust port, and delivers the lubricating oil back to the delivery oil storage tank.

6. The rotary compressor according to claim 5, characterized in that: The gas-liquid separator includes a filter element, 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 connected to the gas-liquid separation chamber, the upper end opening of the oil outlet channel is lower than the input end of the exhaust component, the lower end opening of the oil outlet channel is connected to the oil storage tank, the filter element is installed at the upper end opening of the oil outlet channel, the filter element protrudes upward compared to the bottom wall of the gas-liquid separation chamber, the oil outlet core shaft and the core shaft mounting seat are gap-fitted and both are arranged in the oil outlet channel, both are located below the filter element and corresponding to the output end of the filter element, and the gap between the oil outlet core shaft and the core shaft mounting seat is connected to the oil outlet channel.

7. The rotary compressor according to claim 6, characterized in that: When the rotary compressor is working, the lubricating oil immerses the oil inlet; when the oil-swinging hole transports the lubricating oil to the compression chamber, the lubricating oil is transported to the gas-liquid separation chamber along the refrigerant transport direction; a separation chamber partition is provided in the gas-liquid separation chamber, and the separation chamber partition is used to separate the gas-liquid mixture, one end of the separation chamber partition is connected to one end of the inner wall of the gas-liquid separation chamber, and the other end of the separation chamber partition extends freely and is spaced from the other end of the inner wall of the gas-liquid separation chamber, and the bottom wall of the gas-liquid separation chamber is also provided with a downwardly concave sedimentation groove, and the sedimentation groove is used to collect the settled lubricating oil.

8. The rotary compressor according to claim 7, characterized in that: The compression chamber comprises a first compression chamber and a second compression chamber, the gas transmission mechanism comprises an air chamber, the air chamber comprises a first air chamber, a second air chamber and a third air chamber, the first air chamber, the first compression chamber, the second air chamber, the second compression chamber, the gas-liquid separation chamber and the third air chamber are connected in series in sequence, the lubricating oil enters the first compression chamber through the oil-slinging hole, the lubricating oil and the refrigerant are sequentially transmitted from the first compression chamber to the second air chamber and the gas-liquid separation chamber, the gas-liquid separation chamber separates the lubricating oil and the refrigerant, the separated gas is transmitted to the third air chamber and then discharged to the outside, and the separated lubricating oil is transmitted to the oil storage tank via the gas-liquid separator; The compression chamber includes a first compression chamber and a second compression chamber, and the air chamber includes a first air chamber and a second air chamber. The input end of the first compression chamber and the input end of the second compression chamber are respectively connected to the output end of the first air chamber, and the output end of the first compression chamber and the output end of the second compression chamber are respectively connected to the input end of the second air chamber. The lubricating oil enters the first compression chamber and the second compression chamber through the oil-throwing hole, and the lubricating oil and the refrigerant enter the gas-liquid separation chamber from the first compression chamber and the second compression chamber to be separated. The separated gas is transported to the second air chamber and then discharged to the outside. The separated lubricating oil is transported to the oil storage tank via the gas-liquid separator.

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