High-efficiency energy-saving cryogenic machine

Abstract

The application relates to the technical field of deep cooling equipment, in particular to an efficient energy-saving type deep cooling machine which comprises an outer box body, heat exchange pipes and a long shaft cylinder, the heat exchange pipes comprise a main pipe body, a movable rod, a piston assembly, a first sealing disc and a movable sleeve, the main pipe body is internally provided with a first cavity and a second cavity which are separated by a fixed ring, an air inlet pipe is arranged on the first cavity, an air outlet is arranged on the second cavity, the movable rod is coaxially and slidingly arranged in the first cavity, one end of the movable rod extends into the second cavity and is coaxially and fixedly provided with a second sealing disc, the piston assembly comprises a first sealing ring which is coaxially arranged with the movable rod, the movable sleeve is axially and slidingly sleeved on the main pipe body, and an air outlet pipe is arranged on the movable sleeve. The application can change the heat absorbed during one work according to different requirements, can ensure that the equipment can work stably for a long time under different heat absorption conditions, and reduces unnecessary use cost.

Description

Technical Field

[0001] This invention relates to the field of cryogenic equipment technology, specifically to a high-efficiency and energy-saving cryogenic machine. Background Technology

[0002] High-purity helium gas is compressed by a compressor pump, then purified and cooled again after passing through a cooler, oil-gas separator, and adsorber before being output to the expander unit. Driven by a motor, the expander unit's gas distribution assembly and regenerator assembly work together to adiabatically release the compressed helium gas at the bottom of the cylinder, generating cooling capacity. Finally, the gas is output through a cold head heat exchanger. Currently, most cryogenic compressors use high-pressure helium gas as a power source and an expansion tube as the expansion mechanism. However, the expansion rate of the expansion tube is relatively low, making the conversion of high-pressure helium gas to low-pressure helium gas slow and resulting in low heat absorption efficiency.

[0003] Chinese patent CN217560132U discloses a high-gain, energy-saving cryogenic compressor. High-pressure helium gas generated by the compressor enters the first working chamber through a high-pressure inlet pipe. Subsequently, the high-pressure helium gas inside the first working chamber enters the second working chamber. The volume of the space occupied by the high-pressure helium gas is changed, causing it to expand and form low-pressure helium gas, thus absorbing heat. During operation, this scheme changes the volume of the space occupied by the high-pressure helium gas, causing it to expand and form low-pressure helium gas for heat absorption. The volume change must reach a rated value for low-pressure helium gas output, thus ensuring a fixed amount of heat absorbed in each working cycle. When the application scenario changes, a cryogenic compressor with different heat absorption capacity needs to be replaced, which not only takes time but also incurs significant economic costs in preparing multiple cryogenic compressors with different heat absorption capacities. Summary of the Invention

[0004] To address the aforementioned issues, a high-efficiency and energy-saving cryogenic compressor is provided. A first sealing disc is slidably positioned inside a second cavity, allowing for changes in the volume of the low-pressure helium space. The cooperation between a first sealing ring and a movable rod ensures that changes in the movable rod's movement distance do not affect the movement of the first sealing ring. Furthermore, the cooperation between a movable sleeve and an outlet ensures that leakage does not occur when high-pressure helium is converted to low-pressure helium in different volumes.

[0005] To address the problems of existing technologies, a high-efficiency and energy-saving cryogenic compressor is provided, comprising an outer casing, heat exchange tubes, and a long-shaft cylinder. The heat exchange tubes include a main pipe, a movable rod, a piston assembly, a first sealing disc, and a movable sleeve. The main pipe has a first cavity and a second cavity separated by a fixed ring. Both the first and second cavities are cylindrical and coaxial with the fixed ring. An inlet pipe extending along the diameter of the main pipe is located on the first cavity near the fixed ring. At least two outlets extending along the diameter of the main pipe are provided on the second cavity. All outlets are... The main body has a uniformly arranged axial direction. The movable rod is slidably disposed coaxially inside the first cavity. One end of the movable rod extends into the second cavity and is coaxially fixedly disposed with a second sealing disc. The piston assembly includes a first sealing ring coaxially disposed with the movable rod. The movable rod can drive the first sealing ring to move. When the first sealing ring contacts the fixed ring, the movable rod and the first sealing ring slide axially relative to each other. The first sealing disc is slidably disposed axially inside the second cavity. The movable sleeve is slidably disposed axially on the main body. The movable sleeve is radially disposed with an air outlet pipe that can communicate with the air outlet.

[0006] Preferably, the piston assembly further includes a first positioning strip and a sliding frame. The first positioning strip is slidably disposed inside the first sealing ring, and the sliding direction of the first positioning strip is parallel to the diameter direction of the first sealing ring. A first positioning hole is provided on the movable rod for the first positioning strip to be inserted. A guide shaft is fixedly disposed at one end of the first positioning strip away from the center of the first sealing ring. The axis of the guide shaft is perpendicular to the sliding direction of the first positioning strip and perpendicular to the axis of the first sealing ring. The sliding frame is slidably disposed inside the first sealing ring, and the sliding direction of the sliding frame is parallel to the axis of the first sealing ring. The sliding frame is sleeved on the first positioning strip, and a guide groove is provided on the sliding frame for sliding cooperation with the guide shaft. A first magnetic element is fixedly disposed on the fixed ring for cooperation with the opposite magnetic force of the sliding frame.

[0007] Preferably, the piston assembly further includes a first elastic connector, which is fixedly disposed between the first positioning strip and the first sealing ring, and the first elastic connector pushes the first positioning strip to move toward the movable rod.

[0008] Preferably, the piston assembly further includes a second sealing ring, which is located inside the first cavity and is coaxial with the first sealing ring. The second sealing ring is disposed on the end of the first sealing ring away from the fixed ring. The movable rod can drive the second sealing ring to move. A second magnetic element that can cooperate with the opposite magnetic force of the sliding frame is fixedly disposed on the second sealing ring.

[0009] Preferably, a guide groove is provided on the inner wall of the first cavity, the length direction of the guide groove is parallel to the axis of the first cavity, and a guide protrusion that can slide and cooperate with the guide groove is fixedly provided on the first sealing ring.

[0010] Preferably, the piston assembly further includes an internally threaded sleeve, which is threaded onto the movable rod, and the second sealing ring is rotatably and coaxially sleeved on the internally threaded sleeve.

[0011] Preferably, the piston assembly further includes a second elastic connector, which is fixedly disposed between the first sealing ring and the second sealing ring. The number of second elastic connectors is at least two, and all the second elastic connectors are evenly distributed around the axis of the first sealing ring.

[0012] Preferably, the main body further includes a movable ring, which is coaxially and movably sleeved on one end of the internally threaded sleeve located outside the outer casing. Two guide rails extend radially on the movable ring, and the two guide rails are evenly arranged around the axis of the movable ring. A second positioning strip is slidably arranged in the guide rail, and the sliding direction of the second positioning strip is parallel to the length direction of the guide rail. A positioning protrusion is fixedly provided at one end of the second positioning strip near the main body. A second positioning hole is opened at the end of the main body for the positioning protrusion to be inserted. There are at least two second positioning holes, and all the second positioning holes are evenly distributed along the axial direction of the main body. A third elastic connector is fixedly provided between the end of the second positioning strip and the end of the guide rail.

[0013] Preferably, a threaded rod that can extend to the outside of the second cavity is coaxially fixed on the first sealing disc. The threaded rod is threadedly connected to the main body. A movable ring is movably sleeved at the end of the threaded rod. Second positioning holes are opened at both ends of the main body. Fixed holes are opened on the second positioning strip. A fixed shaft that can be inserted into the fixed hole is fixedly installed on the movable sleeve.

[0014] Preferably, the vent pipe is a flexible corrugated pipe.

[0015] The advantages of this invention compared to the prior art are: This invention enables the adjustment of the volume of the low-pressure helium space by sliding a first sealing disc inside the second cavity. The first sealing ring and movable rod ensure that changing the movement distance of the movable rod does not affect the movement of the first sealing ring. The movable sleeve and vent prevent leakage when converting high-pressure helium to low-pressure helium within different volumes. This allows a device to adjust the amount of heat absorbed during a single operation according to different needs, while ensuring stable long-term operation under different heat absorption conditions, thus reducing unnecessary operating costs. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a high-efficiency and energy-saving cryogenic machine.

[0017] Figure 2A cross-sectional view of the high-pressure helium input state of a high-efficiency, energy-saving cryogenic compressor. Figure 1 .

[0018] Figure 3 yes Figure 2 A magnified view of part A in the diagram.

[0019] Figure 4 This is a cross-sectional schematic diagram of a high-efficiency and energy-saving cryogenic generator outputting low-pressure helium gas.

[0020] Figure 5 yes Figure 4 A magnified view of part B in the diagram.

[0021] Figure 6 A cross-sectional view of the high-pressure helium input state of a high-efficiency, energy-saving cryogenic compressor. Figure 2 .

[0022] Figure 7 yes Figure 6 A magnified view of part C in the diagram.

[0023] Figure 8 This is a three-dimensional exploded view of the heat exchange tubes in a high-efficiency and energy-saving cryogenic machine.

[0024] Figure 9 This is a three-dimensional exploded view of the moving rod in the heat exchange tube.

[0025] Figure 10 This is a three-dimensional exploded view of the first sealing ring in the piston assembly.

[0026] The numbers on the map are: 1-Outer casing; 2-Heat exchange tube; 21-Main tube; 211-Fixing ring; 212-First cavity; 213-Second cavity; 214-Inlet pipe; 215-Outlet; 216-First magnetic component; 217-Guide groove; 218-Second positioning hole; 22-Modible rod; 221-Second sealing disc; 222-First positioning hole; 23-Piston assembly; 231-First sealing ring; 2311-Guide protrusion; 232-First positioning strip; 2321-Guide shaft; 233-Slide... Moving frame; 2331-Guide groove; 234-First elastic connector; 235-Second sealing ring; 236-Second magnetic component; 237-Internal threaded sleeve; 238-Second elastic connector; 24-First sealing disc; 241-Threaded rod; 25-Modible sleeve; 251-Air outlet pipe; 252-Fixed shaft; 26-Modible ring; 261-Guide slide rail; 262-Second positioning strip; 2621-Positioning protrusion; 2622-Fixed hole; 263-Third elastic connector; 3-Long shaft cylinder. Detailed Implementation

[0027] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0028] See Figures 1-5 As shown, a high-efficiency and energy-saving cryogenic compressor includes an outer casing 1, a heat exchange tube 2, and a long-shaft cylinder 3. The heat exchange tube 2 includes a main pipe 21, a movable rod 22, a piston assembly 23, a first sealing disc 24, and a movable sleeve 25. The main pipe 21 has a first cavity 212 and a second cavity 213 separated by a fixed ring 211. Both the first cavity 212 and the second cavity 213 are cylindrical and coaxial with the fixed ring 211. An air inlet pipe 214 extending along the diameter of the main pipe 21 is provided on the first cavity 212 near the fixed ring 211. At least two air outlets 215 extending along the diameter of the main pipe 21 are provided on the second cavity 213. All the air outlets 215 extend along the diameter of the main pipe 21. The axis of the piston is uniformly arranged. The movable rod 22 is slidably arranged coaxially inside the first cavity 212. One end of the movable rod 22 extends into the second cavity 213 and is coaxially fixed with a second sealing disc 221. The piston assembly 23 includes a first sealing ring 231 coaxially arranged with the movable rod 22. The movable rod 22 can drive the first sealing ring 231 to move. When the first sealing ring 231 contacts the fixed ring 211, the movable rod 22 and the first sealing ring 231 slide axially relative to each other. The first sealing disc 24 is slidably arranged axially inside the second cavity 213. The movable sleeve 25 is slidably sleeved on the main tube 21. The movable sleeve 25 is radially arranged with an exhaust pipe 251 that can communicate with the exhaust port 215.

[0029] High-pressure helium gas is input through the inlet pipe 214, continuously entering the space formed by the first cavity 212, the first sealing ring 231, and the second sealing disk 221. Once the space is filled with high-pressure helium, the long-shaft cylinder 3 is activated, pushing the movable rod 22 towards the interior of the first sealing disk 24. Between the contact between the first sealing ring 231 and the fixed ring 211, the first sealing ring 231 and the second sealing disk 221 maintain contact. The movable rod 22, with a fixed distance, moves towards the first sealing disk 24. When the first sealing ring 231 contacts the fixed ring 211, the first sealing ring 231 and the movable rod 22 are in a relative sliding state. The second sealing disk 221 continuously approaches the first sealing disk 24 until it contacts it. At this time, high-pressure helium gas will be in the space formed by the second cavity 213, the first sealing ring 231, and the second sealing disk 221. When the second sealing disk 221 contacts the first sealing disk 24, the high-pressure helium gas... The increased volume of the space creates low-pressure helium gas and absorbs heat. The low-pressure helium then exits through the outlet 215 and outlet pipe 251. When it is necessary to change the heat absorbed by the high-pressure helium to low-pressure helium, the volume of the space formed by the second cavity 213, the first sealing ring 231, and the second sealing disc 221 is changed by moving the first sealing disc 24 and the movable sleeve 25. Compared to the prior art, the first sealing disc 24 of this invention is slidably disposed inside the second cavity 213, allowing the volume of the space where the low-pressure helium is located to be changed. The cooperation between the first sealing ring 231 and the movable rod 22 ensures that changes in the moving distance of the movable rod 22 do not affect the movement of the first sealing ring 231. The cooperation between the movable sleeve 25 and the outlet ensures that no leakage occurs when high-pressure helium is converted to low-pressure helium in different volumes. This allows a device to change the heat absorbed during a single operation according to different needs, while ensuring that the device can operate stably for extended periods under different heat absorption conditions, reducing unnecessary operating costs.

[0030] See Figure 5 and Figure 10As shown: The piston assembly 23 also includes a first positioning strip 232 and a sliding frame 233. The first positioning strip 232 is slidably disposed inside the first sealing ring 231, and the sliding direction of the first positioning strip 232 is parallel to the diameter direction of the first sealing ring 231. The movable rod 22 has a first positioning hole 222 for the first positioning strip 232 to be inserted. A guide shaft 2321 is fixedly disposed at one end of the first positioning strip 232 away from the center of the first sealing ring 231. The axis of the guide shaft 2321 is parallel to the axis of the first positioning strip 232. The sliding direction is perpendicular, the axis of the guide shaft 2321 is perpendicular to the axis of the first sealing ring 231, the sliding frame 233 is slidably disposed inside the first sealing ring 231, the sliding direction of the sliding frame 233 is parallel to the axis of the first sealing ring 231, the sliding frame 233 is sleeved on the first positioning strip 232, the sliding frame 233 is provided with a guide groove 2331 that can slide and cooperate with the guide shaft 2321, and the fixed ring 211 is fixedly provided with a first magnetic element 216 that can cooperate with the opposite magnetic force of the sliding frame 233.

[0031] When the first sealing ring 231 is not in contact with the fixed ring 211, the first positioning strip 232 is inserted into the first positioning hole 222. The guide groove 2331 is inclined and the guide shaft 2321 is at the lowest end of the guide groove 2331. At this time, the first sealing ring 231 and the movable rod 22 are in a relatively fixed state. When the first sealing ring 231 is in contact with the fixed ring 211, the first magnetic element 216 causes the sliding frame 233 to move. The guide shaft 2321 slides to the highest position inside the guide groove 2331, and the first positioning strip 232 disengages from the first positioning hole 222. At this time, the first sealing ring 231 and the movable rod 22 are in a relatively sliding state. Compared with the prior art, the sliding frame 233 of the present invention allows the first positioning strip 232 to disengage from the first positioning hole 222, so that the first sealing ring 231 will not block the movement of the movable rod 22 after the first sealing disc 24 moves to a new position.

[0032] See Figure 5 As shown: The piston assembly 23 also includes a first elastic connector 234, which is fixedly disposed between the first positioning strip 232 and the first sealing ring 231. The first elastic connector 234 pushes the first positioning strip 232 to move closer to the movable rod 22.

[0033] When the first sealing ring 231 is not in contact with the fixed ring 211, the first elastic connector 234 provides a small amount of elastic force to the first positioning strip 232 to ensure that it is inserted into the first positioning hole 222. Compared with the prior art, the first elastic connector 234 of the present invention limits the position of the first positioning strip 232 when the first sealing ring 231 is not in contact with the fixed ring 211, thereby preventing the first positioning strip 232 from dislodging from the first positioning hole 222 when it is not close to the fixed ring 211.

[0034] See Figure 5 As shown: The piston assembly 23 also includes a second sealing ring 235, which is located inside the first cavity 212. The second sealing ring 235 is coaxial with the first sealing ring 231. The second sealing ring 235 is disposed on the first sealing ring 231 at one end away from the fixed ring 211. The movable rod 22 can drive the second sealing ring 235 to move. A second magnetic element 236 that can cooperate with the opposite magnetic force of the sliding frame 233 is fixedly disposed on the second sealing ring 235.

[0035] When the first sealing ring 231 is not in contact with the fixed ring 211, the second sealing ring 235 moves away from the first sealing ring 231. At this time, the first sealing ring 231 and the second sealing ring 235 maintain a distance from each other and move synchronously with the movable rod 22. After the first sealing ring 231 contacts the fixed ring 211, the second sealing ring 235 moves towards the first sealing ring 231. When the second sealing ring 235 contacts the first sealing ring 231, the second magnetic member 236 will contact the fixed relationship between the first magnetic member 216 and the sliding frame 233. The first elastic connector 234 restores its deformation and pushes the first positioning strip 232 towards the movable rod 22. Compared with the prior art, the second sealing ring 235 of the present invention contacts the first positioning strip 232 away from the movable rod 22 in a fixed state, so that the movable rod 22 can drive the first sealing ring 231 away from the fixed ring 211.

[0036] See Figure 6 and Figure 10 As shown: A guide groove 217 is provided on the inner wall of the first cavity 212. The length direction of the guide groove 217 is parallel to the axis of the first cavity 212. A guide protrusion 2311 that can slide and cooperate with the guide groove 217 is fixedly provided on the first sealing ring 231.

[0037] The movable rod 22 drives the second sealing ring 235 to move away from the fixed ring 211. At this time, the second sealing ring 235 will drive the first sealing ring 231 to move simultaneously through the second magnetic element 236. After the first sealing ring 231 moves a certain distance, the guide protrusion 2311 will contact the end of the guide groove 217, and the fixed relationship between the first sealing ring 231 and the second sealing ring 235 will be released. Compared with the prior art, the guide groove 217 and the guide protrusion 2311 of the present invention limit the movement range of the first sealing ring 231, thereby ensuring that the first positioning strip 232 can be inserted into the first positioning hole 222 again.

[0038] See Figures 6-7 and Figure 9 As shown: The piston assembly 23 also includes an internal threaded sleeve 237, which is threaded onto the movable rod 22, and the second sealing ring 235 is rotatably and coaxially sleeved on the internal threaded sleeve 237.

[0039] Rotating the internal threaded sleeve 237 causes the second sealing ring 235 to move along the axis of the movable rod 22. Compared with the prior art, the internal threaded sleeve 237 of the present invention allows the interval between the second sealing ring 235 and the first sealing ring 231 to be changed, thereby preventing the second sealing ring 235 from obstructing the normal movement of the movable rod 22.

[0040] See Figure 6 and Figure 9 As shown: The piston assembly 23 also includes a second elastic connector 238, which is fixedly disposed between the first sealing ring 231 and the second sealing ring 235. The number of second elastic connectors 238 is at least two, and all the second elastic connectors 238 are evenly distributed around the axis of the first sealing ring 231.

[0041] When the first positioning strip 232 disengages from the first positioning hole 222, the first sealing ring 231 and the second sealing ring 235 are prevented from rotating relative to each other by two second elastic connectors 238. Compared with the prior art, the second elastic connectors 238 of the present invention limit the movement state of the first sealing ring 231, thereby ensuring that the first positioning strip 232 is always above the movement trajectory of the first positioning hole 222.

[0042] See Figures 6-9 As shown: The main body 21 also includes a movable ring 26, which is coaxially and movably sleeved on one end of the internal threaded sleeve 237 located outside the outer housing 1. Two guide rails 261 extend radially on the movable ring 26, and the two guide rails 261 are evenly arranged around the axis of the movable ring 26. A second positioning strip 262 is slidably arranged in the guide rail 261. The sliding direction of the second positioning strip 262 is parallel to the length direction of the guide rail 261. A positioning protrusion 2621 is fixedly arranged at one end of the second positioning strip 262 near the main body 21. A second positioning hole 218 is opened at the end of the main body 21, which allows the positioning protrusion 2621 to be inserted. There are at least two second positioning holes 218, and all the second positioning holes 218 are evenly distributed along the axial direction of the main body 21. A third elastic connector 263 is fixedly arranged between the end of the second positioning strip 262 and the end of the guide rail 261.

[0043] After controlling the second positioning bar 262 away from the second positioning hole 218, the movable ring 26 is slid to move it to the appropriate position. Then, the second positioning bar 262 is released, and the third elastic connector 263 pushes the second positioning bar 262 to move so that the positioning protrusion 2621 is inserted into the new second positioning hole 218. Then, the internal threaded sleeve 237 is rotated to contact the movable ring 26. Compared with the prior art, the movable ring 26 of the present invention specifies the movement distance of the second sealing ring 235, thereby ensuring that the movement distance of the second sealing ring 235 can be controlled.

[0044] See Figure 6 and Figures 8-9 As shown: A threaded rod 241 that can extend to the outside of the second cavity 213 is coaxially fixed on the first sealing disc 24. The threaded rod 241 is threadedly connected to the main body 21. A movable ring 26 is movably sleeved at the end of the threaded rod 241. A second positioning hole 218 is opened at both ends of the main body 21. A fixing hole 2622 is opened on the second positioning strip 262. A fixing shaft 252 that can be inserted into the fixing hole 2622 is fixedly installed on the movable sleeve 25.

[0045] The rotating threaded rod 241 causes the first sealing disc 24 to move. When the first sealing disc 24 moves, the sliding sleeve moves simultaneously through the cooperation of the fixing hole 2622 and the fixing shaft 252. Compared with the prior art, the first sealing disc 24 of the present invention drives the sliding sleeve to move synchronously, thereby ensuring that the vent pipe 251 can be connected with different vent holes.

[0046] See Figure 8 As shown: the air outlet pipe 251 is a flexible corrugated pipe.

[0047] When the movable sleeve 25 moves, the corrugated pipe will extend or retract. Compared with the prior art, the exhaust pipe 251 of the present invention is set as a corrugated pipe, so that the connection between the exhaust pipe 251 and the outer casing 1 will not be changed when the inside of the heat exchange tube 2 is changed.

[0048] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A high-efficiency and energy-saving cryogenic compressor, comprising an outer casing (1), heat exchange tubes (2), and a long-shaft cylinder (3), characterized in that, The heat exchange tube (2) includes a main body (21), a movable rod (22), a piston assembly (23), a first sealing disc (24), and a movable sleeve (25). The main body (21) is provided with a first cavity (212) and a second cavity (213) separated by a fixed ring (211). Both the first cavity (212) and the second cavity (213) are cylindrical and coaxial with the fixed ring (211). An air inlet pipe (214) extending along the diameter of the main body (21) is provided on the first cavity (212) near the fixed ring (211). At least two air outlets (215) extending along the diameter of the main body (21) are provided on the second cavity (213). All the air outlets (215) are evenly arranged along the axial direction of the main body (21). The movable rod (22) is slidably disposed coaxially inside the first cavity (212), and one end of the movable rod (22) extends into the second cavity (213) and is coaxially fixedly disposed with a second sealing disc (221). The piston assembly (23) includes a first sealing ring (231) coaxially arranged with the movable rod (22). The movable rod (22) can drive the first sealing ring (231) to move. When the first sealing ring (231) contacts the fixed ring (211), the movable rod (22) and the first sealing ring (231) slide axially relative to each other. The first sealing disc (24) is axially slidably disposed in the second cavity (213), and the first sealing disc (24) and the second sealing disc (221) are respectively disposed at both ends of the second cavity (213); The movable sleeve (25) is axially slidably sleeved on the main body (21), and the movable sleeve (25) is radially provided with an air outlet pipe (251) that can communicate with the air outlet (215).

2. The high-efficiency energy-saving cryogenic compressor according to claim 1, characterized in that, The piston assembly (23) also includes a first positioning bar (232) and a sliding frame (233); The first positioning strip (232) is slidably disposed inside the first sealing ring (231). The sliding direction of the first positioning strip (232) is parallel to the diameter direction of the first sealing ring (231). The movable rod (22) is provided with a first positioning hole (222) for inserting the first positioning strip (232). A guide shaft (2321) is fixedly disposed at one end of the first positioning strip (232) away from the center of the first sealing ring (231). The axis of the guide shaft (2321) is perpendicular to the sliding direction of the first positioning strip (232). The axis of the sliding frame (233) is perpendicular to the axis of the first sealing ring (231). The sliding frame (233) is slidably disposed inside the first sealing ring (231). The sliding direction of the sliding frame (233) is parallel to the axis of the first sealing ring (231). The sliding frame (233) is sleeved on the first positioning strip (232). The sliding frame (233) is provided with a guide groove (2331) that can slide with the guide shaft (2321). The fixed ring (211) is fixedly provided with a first magnetic element (216) that can cooperate with the opposite magnetic force of the sliding frame (233).

3. The high-efficiency energy-saving cryogenic compressor according to claim 2, characterized in that, The piston assembly (23) also includes a first resilient connector (234); The first elastic connector (234) is fixedly disposed between the first positioning bar (232) and the first sealing ring (231), and the first elastic connector (234) pushes the first positioning bar (232) to move closer to the movable rod (22).

4. The high-efficiency energy-saving cryogenic compressor according to claim 3, characterized in that, The piston assembly (23) also includes a second sealing ring (235); The second sealing ring (235) is located inside the first cavity (212). The second sealing ring (235) is coaxial with the first sealing ring (231). The second sealing ring (235) is located on the first sealing ring (231) at one end away from the fixed ring (211). The movable rod (22) can drive the second sealing ring (235) to move. A second magnetic element (236) that can cooperate with the opposite magnetic force of the sliding frame (233) is fixedly provided on the second sealing ring (235).

5. A high-efficiency energy-saving cryogenic compressor according to claim 4, characterized in that, The inner wall of the first cavity (212) is provided with a guide groove (217), the length direction of the guide groove (217) is parallel to the axis of the first cavity (212), and a guide protrusion (2311) that can slide and cooperate with the guide groove (217) is fixedly provided on the first sealing ring (231).

6. The high-efficiency energy-saving cryogenic compressor according to claim 5, characterized in that, The piston assembly (23) also includes an internally threaded sleeve (237). The internal threaded sleeve (237) is threaded onto the movable rod (22), and the second sealing ring (235) is rotatably and coaxially sleeved onto the internal threaded sleeve (237).

7. A high-efficiency energy-saving cryogenic compressor according to claim 6, characterized in that, The piston assembly (23) also includes a second resilient connector (238); The second elastic connector (238) is fixedly disposed between the first sealing ring (231) and the second sealing ring (235). The number of the second elastic connector (238) is at least two, and all the second elastic connectors (238) are evenly distributed around the axis of the first sealing ring (231).

8. A high-efficiency energy-saving cryogenic compressor according to claim 7, characterized in that, The main body (21) also includes an active ring (26); The movable ring (26) is coaxially and movably sleeved on one end of the internal threaded sleeve (237) located outside the outer casing (1). Two guide rails (261) extend radially on the movable ring (26). The two guide rails (261) are evenly arranged around the axis of the movable ring (26). A second positioning strip (262) is slidably arranged in the guide rail (261). The sliding direction of the second positioning strip (262) is parallel to the length direction of the guide rail (261). A positioning protrusion (2621) is fixedly arranged at one end of the second positioning strip (262) near the main body (21). A second positioning hole (218) is opened at the end of the main body (21) so that the positioning protrusion (2621) can be inserted. There are at least two second positioning holes (218). All the second positioning holes (218) are evenly distributed along the axis of the main body (21). A third elastic connector (263) is fixedly arranged between the end of the second positioning strip (262) and the guide rail (261).

9. A high-efficiency energy-saving cryogenic compressor according to claim 8, characterized in that, A threaded rod (241) that can extend to the outside of the second cavity (213) is coaxially fixed on the first sealing disc (24). The threaded rod (241) is threadedly connected to the main body (21). A movable ring (26) is movably sleeved at the end of the threaded rod (241). A second positioning hole (218) is opened at both ends of the main body (21). A fixing hole (2622) is opened on the second positioning strip (262). A fixing shaft (252) that can be inserted into the fixing hole (2622) is fixedly installed on the movable sleeve (25).

10. A high-efficiency energy-saving cryogenic compressor according to any one of claims 1-9, characterized in that, The vent pipe (251) is a flexible corrugated pipe.

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