Rotary compressor and refrigeration system

Abstract

The application provides a rotary compressor and a refrigeration system, the rotary compressor comprising a shell, a crankshaft, a pump body assembly and a heat exchange device, the pump body assembly being arranged in the shell, the pump body assembly comprising a first cylinder and a first cover plate, a first gap being formed between an outer peripheral wall surface of the first cylinder and an inner wall surface of the shell, a first groove being formed in the outer peripheral wall surface of the first cylinder and extending in a circumferential direction of the first cylinder, the first cover plate being arranged at an opening end of the first groove and forming a first cooling flow channel with the first groove, two ends of the first cooling flow channel being respectively provided with an inlet joint and an outlet joint, the heat exchange device being arranged outside the shell, the inlet joint and the outlet joint being respectively connected to two ends of the heat exchange device through the shell, so that a cooling medium flows in the first cooling flow channel. The rotary compressor has a small volume, ensures high strength of the cylinder structure, improves the cooling and heat dissipation effect, thereby improving the operation efficiency and reducing the operation power consumption.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a rotary compressor and a refrigeration system having the rotary compressor. Background Technology

[0002] Rotary compressors are widely used in air conditioning and heat pump applications due to their advantages such as high compression efficiency, small size, and low noise. However, because of the clearance fit between the cylinder and housing of a rotary compressor, a gap exists between the cylinder wall and the inner wall of the housing. During actual operation, this gap is filled with a mixture of high-temperature refrigerant and refrigeration oil, which hinders the dissipation of heat generated by the refrigerant compression in the cylinder. This causes the temperature of the metal pump components inside the compressor to rise. This increased temperature heats the low-temperature refrigerant gas entering the compressor's suction chamber. The heated gas expands, reducing the amount of refrigerant gas entering the suction chamber. Consequently, this leads to overheating of the compressor's low-temperature suction, excessively high exhaust temperature, increased power consumption, and decreased efficiency.

[0003] To dissipate heat, existing rotary compressors incorporate a cooling chamber inside the cylinder. However, this results in a relatively thin cylinder wall between the cooling chamber and the compression chamber in the radial direction. Consequently, during gas compression, the inner wall of this section deforms, affecting the compressor's performance. Even if increasing the cylinder wall thickness in the radial direction between the cooling chamber and the compression chamber solves the compression deformation problem, it still increases the overall cylinder diameter, leading to a larger compressor casing diameter. Furthermore, the significant distance between the cooling chamber and the casing makes it difficult to create a cooling thermal resistance effect between the cylinder and the casing. Summary of the Invention

[0004] To achieve the first objective of this invention, this invention provides a small-volume rotary compressor that, while ensuring high strength of the cylinder structure, improves cooling and heat dissipation, thereby increasing operating efficiency and reducing operating power consumption.

[0005] To achieve the second objective of the present invention, the present invention provides a refrigeration system having the above-described rotary compressor.

[0006] To achieve the first objective of this invention, a rotary compressor is provided, comprising a housing, a crankshaft, and a pump assembly. The crankshaft is rotatably supported within the housing about its own axis. The pump assembly is disposed within the housing and includes a first cylinder with a first compression chamber. A first piston on the crankshaft is located within the first compression chamber, and a first gap exists between the outer peripheral wall of the first cylinder and the inner wall of the housing. A first groove is recessed into the outer peripheral wall of the first cylinder along its radial direction, extending circumferentially. The pump assembly also includes a first cover plate, which is disposed at the opening end of the first groove and forms a first cooling channel with the first groove. An inlet connector and an outlet connector are respectively provided at both ends of the first cooling channel. The rotary compressor also includes a heat exchange device disposed outside the housing. The inlet connector and the outlet connector extend through the housing and are connected to both ends of the heat exchange device, so that the cooling medium flows within the first cooling channel.

[0007] As can be seen from the above scheme, the outer peripheral wall of the first cylinder of the rotary compressor of the present invention is recessed with a first groove, the first groove extends in the circumferential direction of the first cylinder, the first cover plate is disposed at the opening end of the first groove and forms a first cooling channel with the first groove, the inlet joint and outlet joint connected to the two ends of the first cooling channel respectively pass through the shell and are connected to the two ends of the heat exchange device, so that the cooling medium flows in the first cooling channel, thereby cooling the first cylinder. Since the first cooling channel of the present invention is formed by a first groove on the outer peripheral wall of the first cylinder and a first cover plate at the opening end of the first groove, the first cooling channel of the present invention is set close to the first gap between the outer peripheral wall of the first cylinder and the inner wall of the housing. This creates a cooling thermal resistance effect between the outer peripheral wall of the first cylinder and the inner wall of the housing, effectively preventing the high-temperature and high-pressure refrigerant gas in the first gap between the outer peripheral wall of the first cylinder and the inner wall of the housing from heating the first cylinder. Furthermore, the cooling medium flowing in the first cooling channel can carry away the heat generated by the high-temperature and high-pressure refrigerant gas on the exhaust side of the compression chamber of the first cylinder from the heat exchange device outside the housing of the fully enclosed rotary compressor. The heat exchange device performs heat exchange and cooling treatment on the high-temperature cooling medium before sending the cooled cooling medium into the first cooling channel, thereby improving the cooling and heat dissipation effect, increasing operating efficiency, and reducing operating power consumption. Furthermore, the first cooling channel on the first cylinder of the present invention is formed by a first groove formed on the outer peripheral wall of the first cylinder and a first cover plate provided at the opening end of the first groove. Therefore, the first cooling channel is radially away from the first compression chamber of the first cylinder, resulting in a thicker cylinder wall between the first cooling channel and the first compression chamber in the radial direction of the first cylinder. This provides higher structural strength, improves the deformation resistance of the first cylinder, and eliminates the need to increase the diameter of the first cylinder, thereby reducing the overall volume of the rotary compressor. Therefore, the rotary compressor of the present invention is small in size, ensuring high cylinder structural strength while improving cooling and heat dissipation, thereby increasing operating efficiency and reducing power consumption.

[0008] A further option is that the wall thickness of the first cylinder in its radial direction is... The depth of the first groove in the radial direction of the first cylinder is , , It is a constant between 1.5 and 4, and Less than .

[0009] A further embodiment includes a second cylinder located on one side of the first cylinder in the axial direction of the crankshaft. The second cylinder has a second compression chamber and an air inlet communicating with the second compression chamber. The second piston on the crankshaft is located in the second compression chamber. There is a second gap between the outer peripheral wall of the second cylinder and the inner wall of the housing. The outer peripheral wall of the second cylinder has a second groove extending in the circumferential direction. The pump assembly also includes a second cover plate, which is disposed at the opening end of the second groove and forms a second cooling channel with the second groove. The two ends of the second cooling channel are respectively connected to an inlet connector and an outlet connector.

[0010] A further proposed solution is to have a wall thickness of the second cylinder in its radial direction of... The depth of the second groove in the radial direction of the second cylinder is The radial width of the air intake hole in the second cylinder is , ,and Less than .

[0011] A further option is to have at least two second cylinders, two second cover plates, and two second pistons, with multiple second cylinders arranged side by side on one side of the first cylinder along the crankshaft axis, and one second cylinder being fitted with one second cover plate and one second piston.

[0012] A further embodiment is that the heat exchange device includes a circulating pump and a heat dissipation mechanism. The circulating pump includes a pump casing, a spacer, and a rotating shaft. The spacer is disposed inside the pump casing and divides the inner cavity of the pump casing into a first cavity and a second cavity. The rotating shaft is rotatably supported on the spacer around its own axis. The first end of the rotating shaft located in the first cavity is provided with a helical blade, which extends helically around the axial direction of the rotating shaft. The pump casing has a first port and a second port that communicate with the first cavity. The first port is connected to the exhaust port of the casing, and the second port is used to connect to the circulation loop of the refrigeration system. The second end of the rotating shaft located in the second cavity is provided with a fan blade. The pump casing has an inlet and an outlet that communicate with the second cavity. The inlet is connected to the outlet connector. The heat dissipation mechanism is connected between the outlet and the inlet connector, and the heat dissipation mechanism dissipates heat and cools the cooling medium.

[0013] A further embodiment is that the pump housing is located on the exhaust side of the housing in the axial direction of the crankshaft, the first chamber and the second chamber are arranged side by side in the axial direction of the crankshaft, and the first chamber is located close to the housing. The rotating shaft extends in the axial direction of the crankshaft, the first port is opened on the end face of the pump housing close to the housing, and the second port is opened on the outer peripheral wall of the pump housing close to the spacer.

[0014] A further design includes a heat dissipation mechanism comprising a heat dissipation shell and heat dissipation fins disposed on the outer wall of the heat dissipation shell, with the outlet connected to the inlet port of the heat dissipation shell and the outlet port of the heat dissipation shell connected to the inlet connector.

[0015] A further option is to provide a curved flow channel inside the heat sink housing, the curved flow channel extending in a serpentine shape, and the two ends of the curved flow channel being the inlet port and the outlet port, respectively; and / or, the heat dissipation mechanism also includes a fan, the fan being mounted on the outer wall of the heat sink housing.

[0016] To achieve the second objective of the present invention, the present invention provides a refrigeration system including a rotary compressor, wherein the rotary compressor is the rotary compressor described above. Attached Figure Description

[0017] Figure 1 This is a structural diagram of an embodiment of the rotary compressor of the present invention.

[0018] Figure 2 This is a schematic diagram of the cooling medium flow in an embodiment of the rotary compressor of the present invention.

[0019] Figure 3 This is a cross-sectional view of an embodiment of the rotary compressor of the present invention.

[0020] Figure 4 This is a cross-sectional view of the circulating pump in an embodiment of the rotary compressor of the present invention.

[0021] Figure 5 This is a structural diagram of the heat dissipation mechanism in an embodiment of the rotary compressor of the present invention.

[0022] Figure 6 This is a schematic diagram of the curved flow channel in an embodiment of the rotary compressor of the present invention.

[0023] Figure 7 This is a cross-sectional view of the pump body assembly in an embodiment of the rotary compressor of the present invention.

[0024] Figure 8 This is an exploded view of the pump body assembly in an embodiment of the rotary compressor of the present invention.

[0025] Figure 9 This is a top view of the first cylinder in an embodiment of the rotary compressor of the present invention.

[0026] Figure 10 This is a first-view sectional view of the first cylinder in an embodiment of the rotary compressor of the present invention.

[0027] Figure 11 This is a structural diagram of the first cylinder in an embodiment of the rotary compressor of the present invention.

[0028] Figure 12This is a second-view sectional view of the first cylinder in an embodiment of the rotary compressor of the present invention.

[0029] Figure 13 This is a top view of the second cylinder in an embodiment of the rotary compressor of the present invention.

[0030] Figure 14 This is a first-view sectional view of the second cylinder in an embodiment of the rotary compressor of the present invention.

[0031] Figure 15 This is a structural diagram of the second cylinder in an embodiment of the rotary compressor of the present invention.

[0032] Figure 16 This is a second-view sectional view of the second cylinder in an embodiment of the rotary compressor of the present invention.

[0033] Figure 17 This is a comparison chart of power consumption between the rotary compressor embodiment of the present invention and existing conventional solutions.

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0035] See Figures 1 to 12 This embodiment discloses a rotary compressor 10, including a housing 11, a crankshaft 115, a pump assembly, and a heat exchange device. The crankshaft 115 is rotatably supported in the housing 11 about its own axis. The pump assembly is disposed in the housing 11 and includes a first cylinder 111 and a first cover plate 1112. The first cylinder 111 has a first compression chamber 1114. The first piston 116 on the crankshaft 115 is located in the first compression chamber 1114, and there is a first gap (not shown) between the outer peripheral wall of the first cylinder 111 and the inner wall of the housing 11. Furthermore, along the radial direction of the first cylinder 111, a first groove 1113 is recessed into the outer peripheral wall of the first cylinder 111 in this embodiment. The first groove 1113 extends circumferentially in the first cylinder 111. A first cover plate 1112 is disposed at the opening end of the first groove 1113 and forms a first cooling channel 1111 with the first groove 1113. An inlet connector 114 and an outlet connector 113 are respectively disposed at both ends of the first cooling channel 1111. In addition, in this embodiment, the heat exchange device is disposed outside the housing 11. The inlet connector 114 and the outlet connector 113 respectively protrude from the housing 11 and are connected to both ends of the heat exchange device, so that the cooling medium flows in the first cooling channel 1111. Specifically, in this embodiment, the cooling medium is a nano-cooling medium.

[0036] In this embodiment, the outer peripheral wall of the first cylinder 111 of the rotary compressor 10 is recessed with a first groove 1113. The first groove 1113 extends in the circumferential direction of the first cylinder 111. The first cover plate 1112 is disposed at the opening end of the first groove 1113 and forms a first cooling channel 1111 with the first groove 1113. The inlet connector 114 and the outlet connector 113, which are connected to the two ends of the first cooling channel 1111, respectively pass through the housing 11 and are connected to the two ends of the heat exchange device, so that the cooling medium flows in the first cooling channel 1111, thereby cooling the first cylinder 111. Since the first cooling channel 1111 in this embodiment is formed by the first groove 1113 formed on the outer peripheral wall of the first cylinder 111 and the first cover plate 1112 provided at the opening end of the first groove 1113, the first cooling channel 1111 in this embodiment is located close to the first gap between the outer peripheral wall of the first cylinder 111 and the inner wall of the housing 11. This allows a cooling thermal resistance effect to be formed between the outer peripheral wall of the first cylinder 111 and the inner wall of the housing 11, effectively avoiding high temperature and high pressure in the first gap between the outer peripheral wall of the first cylinder 111 and the inner wall of the housing 11. The refrigerant gas heats the first cylinder 111, and the cooling medium flowing in the first cooling channel 1111 can carry the heat generated by the high temperature and high pressure refrigerant gas on the exhaust side of the compression chamber of the first cylinder 111 heating the metal cylinder out of the heat exchange device outside the housing 11 of the fully enclosed rotary compressor 10. The heat exchange device performs heat exchange and cooling treatment on the high temperature cooling medium and then sends the cooled cooling medium into the first cooling channel 1111, so that the cooling medium in the first cooling channel 1111 flows, improving the cooling and heat dissipation effect, thereby improving operating efficiency and reducing operating power consumption. Furthermore, in this embodiment, the first cooling channel 1111 on the first cylinder 111 is formed by a first groove 1113 formed on the outer peripheral wall of the first cylinder 111 and a first cover plate 1112 provided at the opening end of the first groove 1113. Therefore, the first cooling channel 1111 is radially away from the first compression chamber 1114 of the first cylinder 111, resulting in a thicker cylinder wall between the first cooling channel 1111 and the first compression chamber 1114 in the radial direction of the first cylinder 111. This provides higher structural strength, improves the deformation resistance of the first cylinder 111, and eliminates the need to increase the diameter of the first cylinder 111, thereby reducing the overall volume of the rotary compressor 10. Therefore, the rotary compressor 10 in this embodiment is small in size, ensuring high cylinder structural strength while improving cooling and heat dissipation, thereby increasing operating efficiency and reducing power consumption.

[0037] To further improve the structural strength and deformation resistance of the first cylinder 111, in this embodiment, the wall thickness of the first cylinder 111 in the radial direction is... The depth of the first groove 1113 in the radial direction of the first cylinder 111 is , , It is a constant between 1.5 and 4, and Less than .

[0038] Combination Figures 3 to 5 In this embodiment, the heat exchange device includes a circulating pump 12 and a heat dissipation mechanism 13. The circulating pump 12 includes a pump housing 121, a spacer 122, and a rotating shaft 126. The spacer 122 is disposed within the pump housing 121 and divides the inner cavity of the pump housing 121 into a first cavity 123 and a second cavity 124. The rotating shaft 126 is rotatably supported on the spacer 122 around its own axis. Furthermore, the first end of the rotating shaft 126 located within the first cavity 123 is provided with a helical blade 125, which extends helically around the axial direction of the rotating shaft 126. The pump housing 121 has a first port 1231 and a second port 1232 communicating with the first cavity 123. The first port 1231 communicates with the exhaust port 110 of the housing 11, and the second port 1232 is used to connect with the circulation loop of the refrigeration system. In addition, in this embodiment, the second end of the rotating shaft 126 located in the second cavity 124 is provided with a fan blade 127. The pump housing 121 has an inlet 1241 and an outlet 1242 that are connected to the second cavity 124. The inlet 1241 is connected to the outlet connector 113. The heat dissipation mechanism 13 is connected between the outlet 1242 and the inlet connector 114, and the heat dissipation mechanism 13 dissipates heat and cools the cooling medium.

[0039] In this embodiment, the first port 1231 of the circulating pump 12 is connected to the exhaust port 110 of the housing 11, and the second port 1232 of the circulating pump 12 is used to connect to the circulation loop of the refrigeration system. The high-pressure refrigerant gas discharged from the housing 11 enters the first cavity 123 of the pump housing 121 from the first port 1231 of the circulating pump 12 and then flows to the circulation loop of the refrigeration system from the second port 1232 of the circulating pump 12. Since the high-pressure refrigerant gas flowing through the first cavity 123 of the pump housing 121 can drive the spiral blades 125 on the rotating shaft 126 to rotate, thereby driving the rotating shaft 126 to rotate around its own axis, and synchronously driving the fan blades 127 on the rotating shaft 126 to rotate. Since the fan blade 127 is located inside the second cavity 124 of the pump housing 121, and the inlet 1241 communicating with the second cavity 124 is connected to the outlet connector 113 of the first cooling channel 1111, the heat dissipation mechanism 13 is connected between the outlet 1242 communicating with the second cavity 124 and the inlet connector 114 of the first cooling channel 1111. Thus, driven by the operation of the fan blade 127 inside the second cavity 124, the high-temperature cooling medium in the first cooling channel 1111 flows from the outlet connector 113 and the inlet 1241. 41 flows into the second cavity 124. The high-temperature cooling medium in the second cavity 124 flows from the outlet 1242 to the heat dissipation mechanism 13. The heat dissipation mechanism 13 dissipates heat and cools the high-temperature cooling medium. The cooling medium after being cooled by the heat dissipation mechanism 13 flows into the first cooling channel 1111 from the inlet connector 114. The cooling medium circulates back and forth, which helps to accelerate the flow of the cooling medium in the first cooling channel 1111, thereby further improving the cooling effect and further improving the operating efficiency of the rotary compressor 10.

[0040] In this embodiment, the circulating pump 12 directly utilizes the high-pressure refrigerant gas discharged from the rotary compressor 10 as a power source to drive the spiral blades 125 within the first chamber 123 of the pump casing 121 to rotate. This, in turn, drives the rotating shaft 126 to rotate around its own axis, synchronously driving the fan blades 127 on the rotating shaft 126. With the continuous rotation of the fan blades 127 located in the second chamber 124, the cooling medium can be driven to flow. The circulating pump 12 in this embodiment has high operating efficiency, requires no additional power source for its operation, and suffers no power loss, thus saving energy.

[0041] To further improve the operating efficiency of the circulating pump 12, in this embodiment, the pump housing 121 is located on the exhaust side of the housing 11 in the axial direction of the crankshaft 115. The first chamber 123 and the second chamber 124 are arranged side by side in the axial direction of the crankshaft 115, and the first chamber 123 is located close to the housing 11. The rotating shaft 126 extends in the axial direction of the crankshaft 115. The first port 1231 is opened on the end face of the pump housing 121 close to the housing 11, and the second port 1232 is opened on the outer peripheral wall of the pump housing 121 close to the spacer 122. This allows the high-pressure refrigerant gas entering the first chamber 123 to drive the spiral blades 125 on the rotating shaft 126 to operate with maximum kinetic energy.

[0042] In this embodiment, the heat dissipation mechanism 13 includes a heat dissipation shell 131 and heat dissipation fins 132 disposed on the outer wall of the heat dissipation shell 131. The outlet 1242 is connected to the inlet port 1311 of the heat dissipation shell 131, and the outlet port 1312 of the heat dissipation shell 131 is connected to the inlet connector 114. Thus, the high-temperature cooling medium carrying heat enters the heat dissipation shell 131 from the inlet port 1311 and flows over a large area. Combined with the heat dissipation fins 132, it dissipates and cools the medium. It can promptly disperse the heat carried in the cooling medium into the air, thereby reducing the temperature of the cooling medium. The cooled medium flows out from the outlet port 1312 of the heat dissipation shell 131 and flows into the first cooling channel 1111.

[0043] To further improve the heat exchange efficiency of the cooling medium, the heat dissipation mechanism 13 in this embodiment also includes a fan 133, which is disposed on the outer wall of the heat dissipation housing 131. Specifically, the speed of the fan 133 can be adjusted by a controller, thereby adjusting the heat dissipation rate of the heat dissipation mechanism 13 according to the actual operating conditions of the rotary compressor 10. Even when the rotary compressor 10 is operating under ultra-high frequency conditions, the heat dissipation mechanism 13 can still meet the heat dissipation requirements.

[0044] See Figure 17 The rotary compressor scheme 10 of this embodiment was installed and tested on a 1.5P small displacement compressor. At different frequencies (20Hz, 40Hz, 60Hz, 80Hz, 100Hz), the power consumption (Power Consumption / W) of the rotary compressor scheme 10 of this embodiment was lower than that of the existing conventional compressor scheme (General Scheme). Moreover, the higher the operating frequency (Operating Frequency / Hz), the greater the reduction in power consumption. That is, the overall performance of the rotary compressor scheme 10 of this embodiment has been improved, and the improvement in operating performance under high frequency conditions is the most obvious.

[0045] Combination Figure 6In this embodiment, a curved flow channel 1313 is provided inside the heat dissipation shell 131. The curved flow channel 1313 extends in a serpentine shape, and the two ends of the curved flow channel 1313 are the inlet port 1311 and the outlet port 1312, respectively. The high-temperature cooling medium carrying heat flows in the curved flow channel 1313, thereby increasing the heat exchange flow path and area, and further improving the heat exchange efficiency of the cooling medium.

[0046] See Figures 13 to 16In this embodiment, the pump body assembly also includes a second cylinder 112. The second cylinder 112 is located on one side of the first cylinder 111 in the axial direction of the crankshaft 115, and the second cylinder 112 has a second compression chamber 1124 and an air inlet 1125 communicating with the second compression chamber 1124. The second piston 117 on the crankshaft 115 is located in the second compression chamber 1124, and there is a second gap (not shown) between the outer peripheral wall of the second cylinder 112 and the inner wall of the housing 11. The outer peripheral wall of the second cylinder 112 has a second groove 1123 recessed inward, and the second groove 1123 extends circumferentially in the second cylinder 112. The pump body assembly also includes a second cover plate 1122, which is disposed at the opening end of the second groove 1123 and forms a second cooling channel 1121 with the second groove 1123. The two ends of the second cooling channel 1121 are respectively connected to the inlet connector 114 and the outlet connector 113. The second cooling channel 1121 contains a cooling medium that cools the second cylinder 112. It also creates a thermal resistance effect between the outer peripheral wall of the second cylinder 112 and the inner wall of the housing 11, effectively preventing the high-temperature, high-pressure refrigerant gas in the second gap between the outer peripheral wall of the second cylinder 112 and the inner wall of the housing 11 from heating the second cylinder 112. Furthermore, the cooling medium flowing in the second cooling channel 1121 carries away the heat generated by the high-temperature, high-pressure refrigerant gas on the exhaust side of the compression chamber of the second cylinder 112, which heats the metal cylinder. The heat exchange device then cools the high-temperature cooling medium before sending the cooled medium back into the second cooling channel 1121, improving the cooling and heat dissipation effect, thereby increasing operating efficiency and reducing power consumption. Furthermore, in this embodiment, the second cooling channel 1121 on the second cylinder 112 is formed by the second groove 1123 formed on the outer peripheral wall of the second cylinder 112 and the second cover plate 1122 provided at the opening end of the second groove 1123. Therefore, the second cooling channel 1121 is far away from the second compression chamber 1124 of the second cylinder 112 in the radial direction of the second cylinder 112, thereby making the cylinder wall thickness between the second cooling channel 1121 and the second compression chamber 1124 in the radial direction of the second cylinder 112 thicker, which has higher structural strength, improves the deformation resistance of the second cylinder 112, and does not require increasing the diameter of the second cylinder 112, thereby reducing the overall volume of the rotary compressor 10.

[0047] To further improve the structural strength and deformation resistance of the second cylinder 112, in this embodiment, the wall thickness of the second cylinder 112 in the radial direction is... The depth of the second groove 1123 in the radial direction of the second cylinder 112 is The width of the air intake 1125 in the radial direction of the second cylinder 112 is , ,and Less than Specifically, in this embodiment, the number of the second cylinder 112, the second cover plate 1122, and the second piston 117 are all at least two. Multiple second cylinders 112 are arranged side-by-side on one side of the first cylinder 111 along the axial direction of the crankshaft 115. Each second cylinder 112 is fitted with one second cover plate 1122 and one second piston 117. Specifically, in this embodiment, the second cover plate 1122 is welded to the opening end of the second groove 1123, and in this embodiment, the first cover plate 1112 is welded to the opening end of the first groove 1113.

[0048] Combination Figure 1 and Figure 2 This is the flow path of the cooling medium in the rotary compressor 10 of this embodiment. Driven by the circulating pump 12, the cooling medium in the first cooling channel 1111 of the first cylinder 111 and the second cooling channel 1121 of the second cylinder 112 flows to the heat dissipation mechanism 13. The high-temperature cooling medium carrying heat is cooled by the heat dissipation mechanism 13 through a combination of large-area and high-speed airflow. This allows the heat carried in the cooling medium to be dispersed into the air in a timely manner, thus reducing the temperature of the cooling medium. The cooled cooling medium flows out from the outlet port 1312 of the heat sink shell 131 and flows back into the first cooling channel 1111 and the second cooling channel 1121, respectively cooling the first cylinder 111 and the second cylinder 112. The cooling medium circulates back and forth, thereby ensuring the cooling and heat dissipation effect, improving the operating efficiency of the rotary compressor 10, and reducing the operating power consumption.

[0049] The above embodiments are merely preferred examples of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles of the present invention in accordance with the claims of the present invention should be included in the scope of the present invention patent application.

Claims

1. A rotary compressor, comprising a housing, a crankshaft, and a pump assembly, wherein the crankshaft is rotatably supported within the housing about its own axis, the pump assembly is disposed within the housing, and the pump assembly includes a first cylinder having a first compression chamber, a first piston on the crankshaft being located within the first compression chamber, and a first gap existing between the outer peripheral wall of the first cylinder and the inner wall of the housing, characterized in that: Along the radial direction of the first cylinder, a first groove is recessed on the outer peripheral wall of the first cylinder. The first groove extends in the circumferential direction of the first cylinder. The pump body assembly also includes a first cover plate. The first cover plate is disposed at the opening end of the first groove and forms a first cooling channel with the first groove. An inlet connector and an outlet connector are respectively provided at both ends of the first cooling channel. The rotary compressor also includes a heat exchange device, which is disposed outside the housing. The inlet connector and the outlet connector extend through the housing and are connected to both ends of the heat exchange device, so that the cooling medium flows in the first cooling channel. The heat exchange device includes a circulating pump and a heat dissipation mechanism. The circulating pump includes a pump casing, a spacer, and a rotating shaft. The spacer is disposed inside the pump casing and divides the inner cavity of the pump casing into a first cavity and a second cavity. The rotating shaft is rotatably supported on the spacer about its own axis. The rotating shaft is provided with a helical blade at the first end of the first cavity. The helical blade extends helically around the axis of the rotating shaft. The pump housing has a first port and a second port that are connected to the first cavity. The first port is connected to the exhaust port of the housing, and the second port is used to connect to the circulation loop of the refrigeration system. The rotating shaft is provided with a fan blade at the second end of the second cavity. The pump casing has an inlet and an outlet that are connected to the second cavity. The inlet is connected to the outlet connector. The heat dissipation mechanism is connected between the outlet and the inlet connector, and the heat dissipation mechanism dissipates heat and cools the cooling medium.

2. The rotary compressor according to claim 1, characterized in that: The first cylinder has a wall thickness in its radial direction of . The depth of the first groove in the radial direction of the first cylinder is , , It is a constant between 1.5 and 4, and Less than .

3. The rotary compressor according to claim 1, characterized in that: The pump assembly further includes a second cylinder, which is located on one side of the first cylinder in the axial direction of the crankshaft. The second cylinder has a second compression chamber and an air inlet hole connected to the second compression chamber. The second piston on the crankshaft is located in the second compression chamber, and there is a second gap between the outer peripheral wall of the second cylinder and the inner wall of the housing. The outer peripheral wall of the second cylinder is recessed with a second groove, which extends in the circumferential direction of the second cylinder. The pump body assembly also includes a second cover plate, which is disposed at the opening end of the second groove and forms a second cooling channel with the second groove. The two ends of the second cooling channel are respectively connected to the inlet connector and the outlet connector.

4. The rotary compressor according to claim 3, characterized in that: The second cylinder has a wall thickness in its radial direction of . The depth of the second groove in the radial direction of the second cylinder is The width of the air inlet in the radial direction of the second cylinder is... , ,and Less than .

5. The rotary compressor according to claim 3, characterized in that: The number of the second cylinder, the second cover plate, and the second piston are all at least two. Multiple second cylinders are arranged side by side on one side of the first cylinder in the axial direction of the crankshaft. Each second cylinder is adapted to one second cover plate and one second piston.

6. The rotary compressor according to claim 1, characterized in that: The pump housing is located on the exhaust side of the housing in the axial direction of the crankshaft, the first cavity and the second cavity are arranged side by side in the axial direction of the crankshaft, and the first cavity is arranged close to the housing, and the rotating shaft extends in the axial direction of the crankshaft; The first port is located on the end face of the pump casing near the housing, and the second port is located on the outer peripheral wall of the pump casing near the spacer.

7. The rotary compressor according to any one of claims 1 to 6, characterized in that: The heat dissipation mechanism includes a heat dissipation shell and heat dissipation fins disposed on the outer wall of the heat dissipation shell. The outlet is connected to the inlet port of the heat dissipation shell, and the outlet port of the heat dissipation shell is connected to the inlet connector.

8. The rotary compressor according to claim 7, characterized in that: The heat dissipation shell is provided with a curved flow channel, which extends in a serpentine shape, and the two ends of the curved flow channel are the inlet port and the outlet port, respectively. And / or, the heat dissipation mechanism further includes a fan disposed on the outer wall of the heat dissipation housing.

9. A refrigeration system, including a rotary compressor, characterized in that: The rotary compressor is any one of the rotary compressors described in claims 1 to 8.

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