A high voltage power cable

Abstract

The application discloses a high-voltage power cable and belongs to the technical field of power cables. The high-voltage power cable comprises a cable body, a protective sleeve and a refrigeration box. The protective sleeve comprises a heat-conducting layer sleeved on the curved outer wall of the cable body and a heat-insulating layer coated on the outer side of the heat-conducting layer. A heat exchange cavity surrounding the cable body is formed in the heat-conducting layer. A guide groove for placing an optical fiber is formed on the inner ring surface of the heat-conducting layer. The guide groove is arranged along the length direction of the cable body. The refrigeration box is connected to the bottom of the protective sleeve. A liquid cavity and a control cavity are arranged in the refrigeration box. The liquid cavity and the heat exchange cavity are connected through a liquid exchange port. A controller connected with the optical fiber is arranged in the control cavity. The controller is electrically connected with a replacement component. The controller controls the replacement component to replace the cooling liquid between the liquid cavity and the heat exchange cavity. The high-voltage power cable with the above structure can ensure normal use of the cable when the cable passes through a special high-temperature area and avoid affecting the service life of the cable.

Description

Technical Field

[0001] This invention belongs to the field of power cable technology, and particularly relates to a high-voltage power cable. Background Technology

[0002] Power cables are the core transmission carrier of modern power systems, and their development spans over a century. Cross-linked polyethylene (XLPE) insulated high-voltage cables have become the mainstream product for 110kV and above due to their excellent electrical and mechanical properties. High-voltage cables frequently need to cross or be near high-temperature areas in industrial, metallurgical, chemical, and urban heating corridor applications. XLPE insulated high-voltage cables experience the following problems when operating in these high-temperature environments for extended periods: 1. Accelerated aging and reduced service life: The thermal aging of XLPE insulation follows the Arrhenius equation; for every 8-10°C increase in temperature, the aging rate increases by 2-3 times, and the insulation life is nearly halved. 2. At high temperatures, the conductivity of XLPE increases nonlinearly and dramatically, leading to a large accumulation of space charge and an electric field distortion rate exceeding 100%, which easily triggers DC breakdown.

[0003] To solve the above problems, a new type of high-voltage power cable is needed to ensure that the cable can be used normally when passing through a special high-temperature area, while avoiding affecting its service life. Summary of the Invention

[0004] The purpose of this invention is to provide a high-voltage power cable that ensures normal operation when the cable passes through a special high-temperature area, while avoiding affecting its service life.

[0005] To achieve the above objectives, the present invention provides a high-voltage power cable, comprising a cable body, a protective sleeve, and a cooling box. The protective sleeve includes a heat-conducting layer sleeved on the curved outer wall of the cable body and a heat-insulating layer covering the outside of the heat-conducting layer. A heat exchange cavity surrounding the cable body is formed within the heat-conducting layer. A guide groove for placing an optical fiber is formed on the inner surface of the heat-conducting layer. The guide groove is arranged along the length direction of the cable body. A through hole communicating with the guide groove is provided on one end face of the heat-insulating layer. The cooling box is connected to the bottom of the protective sleeve. The cooling box contains a liquid chamber and a control chamber. The liquid chamber and the heat exchange cavity are connected through a liquid exchange port. A controller connected to the optical fiber is provided in the control chamber. The controller is electrically connected to a replacement component. The controller controls the replacement component to replace the coolant in the liquid chamber and the heat exchange cavity.

[0006] Preferably, the liquid level of the coolant in the heat exchange chamber is higher than the height of the cable body, but lower than the top height of the heat exchange chamber.

[0007] Preferably, the replacement component includes a replacement pipe, a liquid pump, and a valve plate. The two ends of the replacement pipe are respectively sealed and connected to the bottom liquid outlet of the refrigeration unit and the top liquid inlet of the protective sleeve. The liquid pump is located at the bottom of the liquid chamber and is connected to the replacement pipe. The valve plate is slidably connected to the inner wall of the liquid chamber and is correspondingly arranged with the liquid replacement port. The bottom of the valve plate is connected to a sliding drive component. Both the sliding drive component and the liquid pump are electrically connected to the controller.

[0008] Preferably, the sliding drive assembly includes a support base fixed to the inner wall of the liquid chamber. A drive gear and a driven gear are rotatably connected to the support base. The drive gear is connected to a waterproof motor, which is electrically connected to the controller. The tops of both the drive gear and the driven gear are meshed with a horizontally arranged rack. A fixing rod is fixedly connected to the top surface of the rack. A slot is provided on the top surface of the fixing rod. A compression spring and a push rod are provided in the slot. The top end of the compression spring is fixedly connected to the bottom end of the push rod, and the top end of the push rod extends out of the slot and is fixedly connected to the valve plate.

[0009] Preferably, the outer wall of the refrigeration box is provided with an insulation cover, the top of the insulation cover is fixedly connected to the protective sleeve, a cold source cavity is formed between the insulation cover and the refrigeration box, the cold source cavity is filled with ice, ice filling ports are provided on the two opposite vertical side walls of the insulation cover and are connected to the cold source cavity, a sealing door is detachably connected to the ice filling port, and a drain outlet is provided on the bottom surface of the insulation cover, a plug is detachably connected to the drain outlet.

[0010] Preferably, a plurality of bottom support columns are fixedly connected between the bottom plate of the heat insulation cover and the bottom plate of the refrigeration box, and a plurality of side support columns are fixedly connected between the side plate of the heat insulation cover and the side plate of the refrigeration box.

[0011] Preferably, the bottom surface of the cold source cavity is provided with sloping surfaces on both sides, and the height of the sloping surfaces gradually decreases from the end near the ice filling port to the end away from the ice filling port.

[0012] Preferably, the insulation cover is fixedly connected to the protective sleeve by bolts, the top of the refrigeration box is detachably connected to a box cover, the box cover is provided with a connection port that extends into the protective sleeve, the connection port is sealed and inserted into the protective sleeve, the connection port is provided with the liquid exchange port, the control cavity is in contact with the box cover, the optical fiber includes a fixed section, a connecting section and a functional section, the functional section is located in the guide groove and the through hole and is fixedly connected to the protective sleeve, the fixed section is fixedly connected to the refrigeration box and connected to the controller, and the two ends of the connecting section are respectively plugged and plugged into the functional section and the fixed section through optical fiber connectors.

[0013] Therefore, the high-voltage power cable of the present invention with the above-described structure has the following beneficial effects: The use of a heat insulation layer prevents the heat from being conducted to the high-voltage cable body by the outside hot air, thereby ensuring the normal use and service life of the high-voltage cable body. The heat-conducting layer and heat exchange cavity are used to remove the heat generated during the use of the high-voltage cable body, further ensuring the normal use and service life of the cable body.

[0014] By using optical fibers and cooling replacement components together, intermittent circulation replacement of coolant between the liquid chamber and the heat exchange chamber can be achieved, ensuring the heat exchange performance of the heat exchange chamber and ensuring that the heat-conducting layer and the heat exchange chamber can effectively cool the high-voltage cable body. In addition, the intermittent circulation replacement method saves more energy than the continuous circulation replacement method.

[0015] By utilizing the liquid level design within the heat exchange chamber, air isolation is added between the heat exchange chamber and the liquid chamber, reducing heat transfer between them and ensuring the low temperature of the coolant within the liquid chamber.

[0016] By utilizing the detachable connection between the insulation cover and the cable body, the fixed connection between the insulation cover and the refrigeration box, and the segmented detachable connection of the optical fiber, it is easy to replace the insulation cover and the refrigeration box as a whole. By utilizing the detachable connection between the refrigeration box and the box cover, it is even more convenient to inspect the inside of the refrigeration box.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of a high-voltage power cable according to the present invention; Figure 2 This is a cross-sectional view of an embodiment of a high-voltage power cable according to the present invention; Figure 3 This is a schematic diagram of an embodiment of a sliding drive assembly in a high-voltage power cable according to the present invention.

[0019] In the diagram: 1. Cable body; 2. Protective sleeve; 21. Heat-conducting layer; 22. Heat insulation layer; 23. Heat exchange chamber; 3. Refrigeration box; 4. Liquid chamber; 5. Control chamber; 6. Liquid exchange port; 71. Replacement pipe; 72. Liquid pump; 73. Valve plate; 74. Sliding drive assembly; 741. Support base; 742. Drive gear; 743. Driven gear; 744. Rack; 745. Fixing rod; 746. Compression spring; 747. Top rod; 8. Bottom liquid outlet; 9. Top liquid inlet; 10. Insulation cover; 11. Cold source chamber; 12. Ice block; 13. Ice filling port; 14. Drain outlet; 15. Bottom support column; 16. Side support column; 17. Sloping surface; 18. Box cover; 19. Optical fiber; 191. Fixing section; 192. Connecting section; 193. Functional section; 20. Blockage. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example Reference Figures 1-3 As shown, this embodiment provides a high-voltage power cable, including a cable body 1, a protective sleeve 2, and a cooling box 3. The protective sleeve 2 includes a heat-conducting layer 21 fitted onto the curved outer wall of the cable body 1 and a heat-insulating layer 22 covering the outside of the heat-conducting layer 21. A heat exchange cavity 23 surrounding the cable body 1 is formed within the heat-conducting layer 21. A guide groove for placing an optical fiber 19 is formed on the inner surface of the heat-conducting layer 21, and the guide groove is arranged along the length direction of the cable body 1. A through hole communicating with the guide groove is provided on one end face of the heat-insulating layer 22. The cooling box 3 is connected to the bottom of the protective sleeve 2. The cooling box 3 contains a liquid chamber 4 and a control chamber 5, which are sealed and isolated from each other. The liquid chamber 4 and the heat exchange cavity 23 are connected through a liquid exchange port 6. A controller connected to the optical fiber 19 is provided in the control chamber 5. The controller is electrically connected to a replacement component, and the controller controls the replacement component to achieve the replacement of coolant between the liquid chamber 4 and the heat exchange cavity 23.

[0023] In use, the heat insulation layer 22 prevents heat conduction from external hot air to the high-voltage cable body 1, thus ensuring the normal use and service life of the high-voltage cable body 1. The heat-conducting layer 21 and the coolant in the heat exchange chamber 23 absorb the heat generated during the use of the high-voltage cable body 1, further ensuring the normal use and service life of the cable body 1. By using the controller, optical fiber 19 and cooling replacement components in conjunction, intermittent circulation replacement of coolant between the liquid chamber 4 and the heat exchange chamber 23 can be achieved, ensuring the heat exchange performance of the heat exchange chamber 23 and ensuring that the heat-conducting layer 21 and the heat exchange chamber 23 can effectively cool the high-voltage cable body 1. In addition, the intermittent circulation replacement method saves more energy than the continuous circulation replacement method.

[0024] The process of using fiber optic 19 and cooling replacement components is as follows: a host connected to the controller is set up in the control cavity 5. The host is used to emit nanosecond-level laser pulses, receive the returned Stokes light and anti-Stokes light, analyze the ratio of the intensity of the anti-Stokes light to the intensity of the Stokes light, and transmit the ratio to the controller. The host in control cavity 5 emits nanosecond-level laser pulses into optical fiber 19. Stokes light and anti-Stokes light are generated along the optical fiber 19. The intensity of anti-Stokes light is extremely sensitive to temperature changes. The higher the temperature, the more significant the change in the intensity of anti-Stokes light. The intensity of Stokes light, on the other hand, does not change much with temperature. Some of the light returns to the host. The host analyzes the ratio of Stokes light to anti-Stokes light and converts the temperature signal at the location of optical fiber 19 into a quantifiable optical signal. This ratio is then transmitted to the controller. The controller receives the ratio and compares it with a preset value. When the received ratio reaches the set value, it indicates that the cable body 1 needs to be cooled. At this time, the controller controls the cooling replacement component to start and replace the coolant in the liquid cavity 4 and the heat exchange cavity 23. After the coolant in the heat exchange cavity 23 is replaced with new coolant, the heat-conducting layer 21 and the new coolant absorb the heat on the cable body 1, thereby cooling the cable body 1. After the temperature of the cable body 1 drops to the normal temperature, the ratio of the anti-Stokes light intensity to the Stokes light intensity is lower than the set value. At this time, the controller controls the cooling replacement component to stop the replacement of coolant between the liquid chamber 4 and the heat exchange chamber 23.

[0025] In a further optimized design, the coolant level in the heat exchange chamber 23 is higher than the height of the cable body 1, but lower than the top height of the heat exchange chamber 23.

[0026] In use, the liquid level design in the heat exchange chamber 23 increases air isolation between the heat exchange chamber 23 and the liquid chamber 4, reduces heat transfer between the heat exchange chamber 23 and the liquid chamber 4, and ensures the low temperature of the coolant in the liquid chamber 4.

[0027] In a further optimized scheme, the replacement component includes a replacement pipe 71, a liquid pump 72, and a valve plate 73. The two ends of the replacement pipe 71 are respectively sealed and connected to the bottom liquid outlet 8 of the refrigeration box 3 and the top liquid inlet 9 of the protective sleeve 2. The liquid pump 72 is located at the bottom of the liquid chamber 4 and is connected to the replacement pipe 71. The valve plate 73 is slidably connected to the inner wall of the liquid chamber 4 and is correspondingly set to the liquid replacement port 6. The bottom of the valve plate 73 is connected to the sliding drive assembly 74. Both the sliding drive assembly 74 and the liquid pump 72 are electrically connected to the controller.

[0028] When the coolant in the heat exchange chamber 23 needs to be replaced with the coolant in the liquid chamber 4, the controller controls the sliding drive assembly 74 to move, causing the sliding drive assembly 74 to drive the valve plate 73 to slide, offsetting or partially offsetting the valve plate 73 from the liquid exchange port 6, so that the coolant in the heat exchange chamber 23 can enter the liquid chamber 4 through the liquid exchange port 6. At the same time, the controller controls the liquid pump 72 to start, and the liquid pump 72 pumps the coolant in the liquid chamber 4 to the replacement pipe 71, and then into the heat exchange chamber 23. When the coolant in the heat exchange chamber 23 does not need to be replaced, the controller controls the sliding drive assembly 74 to move so that the sliding drive assembly 74 drives the valve plate 73 to slide back and reset, thereby blocking the coolant exchange port 6. At the same time, the controller controls the liquid pump 72 to stop running.

[0029] Furthermore, the sliding drive assembly 74 includes a support base 741 fixed on the inner wall of the liquid chamber 4. A drive gear 742 and a driven gear 743 are rotatably connected to the support base 741. The drive gear 742 is connected to a waterproof motor, and the waterproof motor is electrically connected to a controller. The tops of both the drive gear 742 and the driven gear 743 are meshed with a horizontally arranged rack 744. A fixing rod 745 is fixedly connected to the top surface of the rack 744. A slot is provided on the top surface of the fixing rod 745. A compression spring 746 and a push rod 747 are provided in the slot. The top end of the compression spring 746 is fixedly connected to the bottom end of the push rod 747. The top end of the push rod 747 extends out of the slot and is fixedly connected to the valve plate 73.

[0030] In use, the waterproof motor rotates forward or backward under the control of the controller, driving the drive gear 742 to rotate forward or backward. The drive gear 742 drives the rack 744 to move. The driven gear 743 works in conjunction with the drive gear 742 to ensure the stability of the rack 744 during its movement. After the rack 744 moves, it can drive the valve plate 73 to move to the left or right. After moving to the left, the valve plate 73 is misaligned or partially misaligned with the liquid exchange port 6. After moving to the right, the valve plate 73 blocks the liquid exchange port 6. During blocking, the compression spring 746 applies pressure to the push rod 747, which makes the valve plate 73 fit tightly against the inner wall of the liquid chamber 4, ensuring the sealing performance.

[0031] In a further optimized design, an insulation cover 10 is provided on the outer wall of the refrigeration box 3. The top of the insulation cover 10 is fixedly connected to the protective sleeve 2. A cold source cavity 11 is formed between the insulation cover 10 and the refrigeration box 3. The cold source cavity 11 is filled with ice blocks 12. Ice filling ports 13 connected to the cold source cavity 11 are provided on the two opposite vertical side walls of the insulation cover 10. A sealing door is detachably connected to the ice filling port 13. A drain outlet 14 is provided on the bottom surface of the insulation cover 10. A plug 20 is detachably connected to the drain outlet 14.

[0032] During use, the insulation cover 10 maintains the low-temperature environment of the refrigeration chamber 3, thereby ensuring the cooling effect of the coolant. The specific working principle of the insulation cover 10 is as follows: the insulation cover 10 is made of heat-insulating material, preventing external temperatures from affecting the low-temperature state of the coolant. Ice balls are added to the cold source chamber 11 through the ice-adding port 13 to lower the temperature of the refrigeration chamber 3, further ensuring the low-temperature state of the coolant. After prolonged operation, the melted ice balls can be drained through the drain port 14, and then ice balls can be added again through the ice-adding port 13.

[0033] Furthermore, several bottom support columns 15 are fixedly connected between the bottom plate of the insulation cover 10 and the bottom plate of the refrigeration box 3, and several side support columns 16 are fixedly connected between the side plate of the insulation cover 10 and the side plate of the refrigeration box 3.

[0034] In use, the bottom support column 15 and the side support column 16 can connect the insulation cover 10 and the refrigeration box 3 to form a cold source cavity 11, and also allow ice blocks 12 to pass through the gaps between the bottom support column 15 and the side support column 16 to fill the cold source cavity 11 as much as possible, so as to ensure the stability and temperature uniformity of the low temperature environment of the refrigeration box 3.

[0035] Furthermore, the bottom surface of the cold source cavity 11 is provided with sloping surfaces 17 on both sides, and the height of the sloping surfaces 17 gradually decreases from the end near the ice filling port 13 to the end away from the ice filling port 13.

[0036] In use, the ramp 17 ensures that the ice balls added from the ice inlet 13 can move to the bottom of the cold source cavity 11 for filling.

[0037] In a further optimized design, the insulation cover 10 is fixedly connected to the protective sleeve 2 by bolts. The top of the refrigeration box 3 is detachably connected to the box cover 18, which has a connection port for inserting into the protective sleeve 2. The connection port is sealed and plugged into the protective sleeve 2. The connection port has a liquid exchange port 6. The control chamber 5 is in contact with the box cover 18. The optical fiber 19 includes a fixed section 191, a connecting section 192, and a functional section 193. The functional section 193 is located in the guide groove and through hole and is fixedly connected to the protective sleeve 2. The fixed section 191 is fixedly connected to the refrigeration box 3 and connected to the controller. The two ends of the connecting section 192 are plugged into the functional section 193 and the fixed section 191 respectively through the optical fiber 19 connector. Protective shells can be set on the upper fixed section 191 and the connecting section 192 to prevent the optical fiber 19 from being affected by the external environment.

[0038] In use, the detachable connection between the insulation cover 10 and the cable body 1, the fixed connection between the insulation cover 10 and the refrigeration box 3, and the segmented detachable connection of the optical fiber 19 facilitate the overall replacement of the insulation cover 10 and the refrigeration box 3. The detachable connection between the refrigeration box 3 and the box cover 18 further facilitates the inspection and maintenance of the interior of the refrigeration box 3. The replacement pipe 71 is set as a long flexible hose or the replacement pipe 71 is set as a detachable connection with the top liquid inlet 9 of the protective sleeve 2, which further facilitates the disassembly and maintenance of the refrigeration box 3.

[0039] Therefore, the present invention provides a high-voltage power cable with the above-described structure, which ensures that the cable can be used normally when passing through a special high-temperature area, while avoiding affecting its service life.

[0040] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0041] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A high-voltage power cable, characterized in that: The system includes a cable body (1), a protective sleeve (2), and a cooling box (3). The protective sleeve (2) includes a heat-conducting layer (21) fitted onto the curved outer wall of the cable body (1) and a heat-insulating layer (22) covering the outside of the heat-conducting layer (21). A heat exchange cavity (23) surrounding the cable body (1) is formed within the heat-conducting layer (21). A guide groove for placing an optical fiber (19) is formed on the inner surface of the heat-conducting layer (21). The guide groove is arranged along the length of the cable body (1). The heat-insulating layer (22)... One end face is provided with a through hole connected to the guide groove. The refrigeration box (3) is connected to the bottom of the protective sleeve (2). The refrigeration box (3) is provided with a liquid chamber (4) and a control chamber (5). The liquid chamber (4) and the heat exchange chamber (23) are connected through a liquid exchange port (6). The control chamber (5) is provided with a controller connected to the optical fiber (19). The controller is electrically connected to the replacement component. The controller controls the replacement component to achieve the replacement of coolant between the liquid chamber (4) and the heat exchange chamber (23).

2. The high-voltage power cable according to claim 1, characterized in that: The liquid level of the coolant in the heat exchange chamber (23) is higher than the height of the cable body (1) and lower than the top height of the heat exchange chamber (23).

3. The high-voltage power cable according to claim 1, characterized in that: The replacement assembly includes a replacement pipe (71), a liquid pump (72), and a valve plate (73). The two ends of the replacement pipe (71) are respectively sealed to the bottom liquid outlet (8) of the refrigeration box (3) and the top liquid inlet (9) of the protective sleeve (2). The liquid pump (72) is located at the bottom of the liquid chamber (4) and connected to the replacement pipe (71). The valve plate (73) is slidably connected to the inner wall of the liquid chamber (4) and is correspondingly arranged to the liquid replacement port (6). The bottom of the valve plate (73) is connected to the sliding drive assembly (74). The sliding drive assembly (74) and the liquid pump (72) are both electrically connected to the controller.

4. The high-voltage power cable according to claim 3, characterized in that: The sliding drive assembly (74) includes a support seat (741) fixed on the inner wall of the liquid chamber (4). A drive gear (742) and a driven gear (743) are rotatably connected to the support seat (741). The drive gear (742) is connected to a waterproof motor, which is electrically connected to the controller. The tops of the drive gear (742) and the driven gear (743) are meshed with a horizontally arranged rack (744). A fixing rod (745) is fixedly connected to the top surface of the rack (744). A slot is provided on the top surface of the fixing rod (745). A compression spring (746) and a push rod (747) are provided in the slot. The top end of the compression spring (746) is fixedly connected to the bottom end of the push rod (747). The top end of the push rod (747) extends out of the slot and is fixedly connected to the valve plate (73).

5. The high-voltage power cable according to claim 1, characterized in that: The outer wall of the refrigeration box (3) is provided with a heat insulation cover (10). The top of the heat insulation cover (10) is fixedly connected to the protective sleeve (2). A cold source cavity (11) is formed between the heat insulation cover (10) and the refrigeration box (3). The cold source cavity (11) is filled with ice (12). The two vertical side walls of the heat insulation cover (10) are provided with ice inlets (13) that communicate with the cold source cavity (11). A sealing door is detachably connected to the ice inlet (13). A drain outlet (14) is provided on the bottom surface of the heat insulation cover (10). A plug (20) is detachably connected to the drain outlet (14).

6. The high-voltage power cable according to claim 5, characterized in that: A number of bottom support columns (15) are fixedly connected between the bottom plate of the heat insulation cover (10) and the bottom plate of the refrigeration box (3), and a number of side support columns (16) are fixedly connected between the side plate of the heat insulation cover (10) and the side plate of the refrigeration box (3).

7. The high-voltage power cable according to claim 5, characterized in that: The bottom surface of the cold source cavity (11) is provided with sloping surfaces (17) on both sides, and the height of the sloping surfaces (17) gradually decreases from the end near the ice inlet (13) to the end away from the ice inlet (13).

8. The high-voltage power cable according to claim 5, characterized in that: The heat insulation cover (10) is fixedly connected to the protective sleeve (2) by bolts. The top of the refrigeration box (3) is detachably connected to the box cover (18). The box cover (18) is provided with a connection port that extends into the protective sleeve (2). The connection port is sealed and plugged into the protective sleeve (2). The connection port is provided with the liquid exchange port (6). The control cavity (5) is in contact with the box cover (18). The optical fiber (19) includes a fixed section (191), a connecting section (192), and a functional section (193). The functional section (193) is located in the guide groove and the through hole and is fixedly connected to the protective sleeve (2). The fixed section (191) is fixedly connected to the refrigeration box (3) and connected to the controller. The two ends of the connecting section (192) are plugged into the functional section (193) and the fixed section (191) respectively through the optical fiber (19) connector.

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