High-low voltage coupling device

Abstract

The invention relates to the technical field of mine underground cooling, and discloses a high-low pressure coupling device which comprises a first fluid distributor, a second fluid distributor, a third fluid distributor, a fourth fluid distributor and a fourth fluid distributor. The second fluid distributor is connected with a second pipeline extending down from the well and is a high-pressure hot water outlet assembly; the third fluid distributor is connected with a third pipeline extending from the underground and is a water inlet assembly of low-pressure hot water; the fourth fluid distributor is connected with a fourth pipeline extending from the underground and is a water outlet assembly of low-pressure cold water; the first fluid distributor, the second fluid distributor, the third fluid distributor and the fourth fluid distributor are respectively connected with the fluid exchange system; the pilot control assembly is connected with the fluid exchange system through a pilot pipeline, and the pilot control assembly is used for adjusting pressure balance. The device has the characteristics of large cold conveying capacity, less cold loss, large pressure bearing capacity, less energy consumption, invariable efficiency and simplicity in maintenance.

Description

Technical Field

[0001] The invention relates to the technical field of mine well cooling, and in particular to a high-low pressure coupling device. Background Art

[0002] As the depth of mining continues to increase, underground heat damage has become more and more serious, becoming one of the major hazards to the health of underground workers. How to reduce the underground temperature and avoid the impact of heat damage has become a major problem faced by major heat-damaged mines.

[0003] Therefore, there is an urgent need for a high-low voltage coupling device to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a high-low voltage coupling device to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides a high-low voltage coupling device, comprising:

[0006] A first fluid distributor is connected to a first pipeline extending from the well and is a water inlet component for high-pressure cold water;

[0007] A second fluid distributor is connected to a second pipeline extending from the well and is a water outlet component for high-pressure hot water;

[0008] A third fluid distributor is connected to a third pipeline extending from the well and is a water inlet component for low-pressure hot water;

[0009] A fourth fluid distributor, connected to a fourth pipeline extending from the well, is a water outlet component for low-pressure cold water;

[0010] a fluid exchange system, wherein the first fluid distributor, the second fluid distributor, the third fluid distributor and the fourth fluid distributor are respectively connected to the fluid exchange system;

[0011] A pilot control assembly is connected to the fluid exchange system through a pilot line, and the pilot control assembly is used to adjust the pressure balance.

[0012] Preferably, the fluid exchange system includes a first fluid exchange component, a second fluid exchange component and a third fluid exchange component, the first fluid exchange component includes a first fluid exchange tube, a first pressure conversion valve, a second pressure conversion valve, a first one-way switch valve, a second one-way switch valve, a first T-pipe and a second T-pipe, one end of the first fluid exchange tube is connected to the first fluid distributor and the fourth fluid distributor respectively through the first pressure conversion valve and the second pressure conversion valve, and the other end of the first fluid exchange tube is connected to the second fluid distributor and the third fluid distributor respectively through the first one-way switch valve and the second one-way switch valve.

[0013] Preferably, the second fluid exchange component includes a second fluid exchange tube, a third pressure conversion valve, a fourth pressure conversion valve, a third one-way switch valve, a fourth one-way switch valve, a third T-type pipe and a fourth T-type pipe, one end of the second fluid exchange tube is connected to the first fluid distributor and the fourth fluid distributor respectively through the third pressure conversion valve and the fourth pressure conversion valve, and the other end of the second fluid exchange tube is connected to the second fluid distributor and the third fluid distributor respectively through the third one-way switch valve and the fourth one-way switch valve.

[0014] Preferably, the third fluid exchange component includes a third fluid exchange tube, a fifth pressure conversion valve, a sixth pressure conversion valve, a fifth one-way switch valve, a sixth one-way switch valve, a fifth T-type pipe and a sixth T-type pipe, one end of the third fluid exchange tube is connected to the first fluid distributor and the fourth fluid distributor respectively through the fifth pressure conversion valve and the sixth pressure conversion valve, and the other end of the third fluid exchange tube is connected to the second fluid distributor and the third fluid distributor respectively through the fifth one-way switch valve and the sixth one-way switch valve.

[0015] Preferably, the pilot control assembly includes a first pilot control valve, a second pilot control valve and a third pilot control valve, the first pilot control valve is connected to a fourth pilot control valve via a first pipeline, the second pilot control valve is connected to a fifth pilot control valve via a second pipeline, the third pilot control valve is connected to a sixth pilot control valve via a third pipeline, the first pilot control valve, the second pilot control valve and the third pilot control valve are connected via a fourth pipeline, and the fourth pilot control valve, the fifth pilot control valve and the sixth pilot control valve are connected via a fifth pipeline.

[0016] Preferably, the pilot line includes a first pilot line, a second pilot line, a third pilot line, a fourth pilot line and a fifth pilot line, wherein two ends of the first pilot line are respectively connected to the first fluid distributor and the fourth line, two ends of the second pilot line are respectively connected to the first fluid exchange tube and the first line, two ends of the third pilot line are respectively connected to the second fluid exchange tube and the second line, two ends of the fourth pilot line are respectively connected to the third fluid exchange tube and the third line, and two ends of the fifth pilot line are respectively connected to the fourth fluid distributor and the fifth line.

[0017] Preferably, pressure gauges and flow meters are installed on the first pipeline, the second pipeline, the third pipeline and the fourth pipeline.

[0018] Preferably, this device, together with the uphole circulating refrigeration system, the uphole circulating pump, the downhole circulating pump, the downhole air cooler and the pressure relief device, constitute the entire cooling system; the first pipeline and the second pipeline are connected to the uphole circulating refrigeration system and the uphole circulating pump, the third pipeline and the fourth pipeline are connected to the downhole circulating pump and the downhole air cooler, and the fourth pipeline is connected to the pressure relief device.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] The present invention provides a high-low pressure coupling device, wherein the first fluid distributor is a water inlet component of high-pressure cold water, the second fluid distributor is a water outlet component of high-pressure hot water, the third fluid distributor is a water inlet component of low-pressure hot water, and the fourth fluid distributor is a water outlet component of low-pressure cold water. With the cooperation of various mechanisms, the cold water on the well is delivered to the well for cooling, and the hot water under the well is pushed back to the well for cooling, thereby realizing energy exchange. The present invention has the characteristics of large cold transmission capacity, small cold loss, large pressure bearing capacity, low energy consumption, constant efficiency, and simple maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the application of the present invention;

[0024] Among them, 1. the first fluid distributor; 2. the second fluid distributor; 3. the third fluid distributor; 4. the fourth fluid distributor; 5. the first fluid exchange component; 501. the first fluid exchange tube; 502. the first pressure conversion valve; 503. the second pressure conversion valve; 504. the first one-way switch valve; 505. the second one-way switch valve; 506. the first T-shaped pipe; 507. the second T-shaped pipe; 6. the second fluid exchange component; 601. the second fluid exchange tube; 602. the third pressure conversion valve; 603. the fourth pressure conversion valve; 604. the third one-way switch valve; 605. the fourth one-way switch valve; 606. the third T-shaped pipe; 607. the fourth T-shaped pipe; 7. the third fluid exchange component; 701. the third fluid exchange tube; 702. the fifth pressure conversion valve; 703. the sixth pressure conversion valve; 704. the fifth one-way switch valve; 705. the sixth one-way switch valve; 706. Fifth T-shaped pipeline; 707, sixth T-shaped pipeline; 8, pilot control assembly; 801, first pilot control valve; 802, second pilot control valve; 803, third pilot control valve; 804, fourth pilot control valve; 805, fifth pilot control valve; 806, sixth pilot control valve; 807, first pipeline; 808, second pipeline; 809, third pipeline; 810, fourth pipeline; 811, fifth pipeline; 9, pilot pipeline; 9 01. First pilot line; 902. Second pilot line; 903. Third pilot line; 904. Fourth pilot line; 905. Fifth pilot line; 10. Centralized control system; 11. First pipeline; 12. Second pipeline; 13. Third pipeline; 14. Fourth pipeline; 15. Circulating refrigeration system; 16. Circulating pump on the well; 17. Circulating pump downhole; 18. Downhole air cooler; 19. Pressure gauge; 20. Flow meter; 21. Pressure relief device. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Reference Figure 1-Figure 2 The present invention provides a high-low voltage coupling device, comprising:

[0028] The first fluid distributor 1 is connected to the first pipeline 11 extending from the well and is a water inlet component for high-pressure cold water;

[0029] The second fluid distributor 2 is connected to the second pipeline 12 extending from the well and is a water outlet component for high-pressure hot water;

[0030] The third fluid distributor 3 is connected to the third pipeline 13 extending from the well, and is a water inlet component for low-pressure hot water;

[0031] The fourth fluid distributor 4 is connected to the fourth pipeline 14 extending from the well, and is a water outlet component for low-pressure cold water;

[0032] A fluid exchange system, wherein the first fluid distributor 1, the second fluid distributor 2, the third fluid distributor 3 and the fourth fluid distributor 4 are respectively connected to the fluid exchange system;

[0033] The pilot control assembly 8 is connected to the fluid exchange system via a pilot line 9, and the pilot control assembly 8 is used to adjust the pressure balance.

[0034] A further optimized solution is that the fluid exchange system includes a first fluid exchange component 5, a second fluid exchange component 6 and a third fluid exchange component 7. The first fluid exchange component 5 includes a first fluid exchange tube 501, a first pressure conversion valve 502, a second pressure conversion valve 503, a first one-way switch valve 504, a second one-way switch valve 505, a first T-shaped pipe 506 and a second T-shaped pipe 507. One end of the first fluid exchange tube 501 is connected to the first fluid distributor 1 and the fourth fluid distributor 4 respectively through the first pressure conversion valve 502 and the second pressure conversion valve 503, and the other end of the first fluid exchange tube 501 is connected to the second fluid distributor 2 and the third fluid distributor 3 respectively through the first one-way switch valve 504 and the second one-way switch valve 505.

[0035] Further optimized solution, the second fluid exchange component 6 includes a second fluid exchange tube 601, a third pressure conversion valve 602, a fourth pressure conversion valve 603, a third one-way switch valve 604, a fourth one-way switch valve 605, a third T-type pipe 606 and a fourth T-type pipe 607, one end of the second fluid exchange tube 601 is connected to the first fluid distributor 1 and the fourth fluid distributor 4 through the third pressure conversion valve 602 and the fourth pressure conversion valve 603 respectively, and the other end of the second fluid exchange tube 601 is connected to the second fluid distributor 2 and the third fluid distributor 3 through the third one-way switch valve 604 and the fourth one-way switch valve 605 respectively.

[0036] To further optimize the solution, the third fluid exchange component 7 includes a third fluid exchange tube 701, a fifth pressure conversion valve 702, a sixth pressure conversion valve 703, a fifth one-way switch valve 704, a sixth one-way switch valve 705, a fifth T-type pipe 706 and a sixth T-type pipe 707. One end of the third fluid exchange tube 701 is connected to the first fluid distributor 1 and the fourth fluid distributor 4 respectively through the fifth pressure conversion valve 702 and the sixth pressure conversion valve 703, and the other end of the third fluid exchange tube 701 is connected to the second fluid distributor 2 and the third fluid distributor 3 respectively through the fifth one-way switch valve 704 and the sixth one-way switch valve 705.

[0037] In one embodiment of the present invention, the first fluid exchange component 5, the second fluid exchange component 6 and the third fluid exchange component 7 are three sets of fluid exchange components with the same structure and function and can operate independently of each other. They are the core components of the high and low pressure coupling device to complete water pressure conversion and water temperature conversion.

[0038] In one embodiment of the present invention, the first fluid exchange tube 501, the second fluid exchange tube 601, and the third fluid exchange tube 701 are important carriers of fluid exchange, and their volumes affect the fluid exchange amount of the high-low pressure coupling device, thereby affecting the amount of cooling delivered to the well. Therefore, their volumes need to be reasonably selected based on the demand downhole.

[0039] The first pressure conversion valve 502, the second pressure conversion valve 503, the third pressure conversion valve 602, the fourth pressure conversion valve 603, the fifth pressure conversion valve 702, and the sixth pressure conversion valve 703 are important actuators for fluid exchange. Their opening and closing can achieve unidirectional fluid conduction, distinguish between high and low pressures, and isolate the mixing of cold and hot water.

[0040] The first one-way switch valve 504, the second one-way switch valve 505, the third one-way switch valve 604, the fourth one-way switch valve 605, the fifth one-way switch valve 704, and the sixth one-way switch valve 705 are important actuators for fluid exchange. Under the action of pressure difference, they can be automatically opened and closed. They have the functions of one-way conduction, high and low pressure distinction, and isolation of the mixing of cold and hot water.

[0041] Further optimized, the pilot control assembly 8 includes a first pilot control valve 801, a second pilot control valve 802 and a third pilot control valve 803, the first pilot control valve 801 is connected to the fourth pilot control valve 804 through a first pipeline 807, the second pilot control valve 802 is connected to the fifth pilot control valve 805 through a second pipeline 808, the third pilot control valve 803 is connected to the sixth pilot control valve 806 through a third pipeline 809, the first pilot control valve 801, the second pilot control valve 802 and the third pilot control valve 803 are connected through a fourth pipeline 810, and the fourth pilot control valve 804, the fifth pilot control valve 805 and the sixth pilot control valve 806 are connected through a fifth pipeline 811.

[0042] In one embodiment of the present invention, different pilot control valves can be used to balance the pressure on both sides of the associated pressure conversion valve, playing a role of pilot control. As a result, the pressure conversion valve can be opened with very little external force, improving work efficiency and reducing equipment energy consumption; at the same time, the water hammer effect caused by the different pressures on both sides when the pressure conversion valve is switched is eliminated, avoiding damage to system components.

[0043] To further optimize the solution, the pilot line 9 includes a first pilot line 901, a second pilot line 902, a third pilot line 903, a fourth pilot line 904 and a fifth pilot line 905, wherein both ends of the first pilot line 901 are respectively connected to the first fluid distributor 1 and the fourth pipeline 810, both ends of the second pilot line 902 are respectively connected to the first fluid exchange tube 501 and the first pipeline 807, both ends of the third pilot line 903 are respectively connected to the second fluid exchange tube 601 and the second pipeline 808, both ends of the fourth pilot line 904 are respectively connected to the third fluid exchange tube 701 and the third pipeline 809, and both ends of the fifth pilot line 905 are respectively connected to the fourth fluid distributor 4 and the fifth pipeline 811.

[0044] To further optimize the solution, a pressure gauge 19 and a flow meter 20 are installed on the first pipeline 11 , the second pipeline 12 , the third pipeline 13 and the fourth pipeline 14 .

[0045] In one embodiment of the present invention, a pressure gauge 19 and a flow meter 20 are respectively arranged on the first pipeline 11, the second pipeline 12, the third pipeline 13 and the fourth pipeline 14, and are used to collect data on pressure, flow and temperature at each position.

[0046] To further optimize the solution, this device, together with the uphole circulating refrigeration system 15, the uphole circulating pump 16, the downhole circulating pump 17, the downhole air cooler 18 and the pressure relief device 21, constitute the entire cooling system; the first pipeline 11 and the second pipeline 12 are connected to the uphole circulating refrigeration system 15 and the uphole circulating pump 16, the third pipeline 13 and the fourth pipeline 14 are connected to the downhole circulating pump 17 and the downhole air cooler 18, and the fourth pipeline 14 is connected to the pressure relief device 21.

[0047] In one embodiment of the present invention, a complete cooling system can be formed with the surface circulating refrigeration system 15, the surface circulating pump 16, the downhole circulating pump 17, the downhole air cooler 18, and the pressure relief device 21 to continuously provide cooling for the downhole working surface, achieve overall cooling of the downhole, and meet the working requirements of downhole personnel and equipment.

[0048] In one embodiment of the present invention, a centralized control system 10 is also provided, and a hydraulic control and an electrical integrated control are provided in the centralized control system 10. The hydraulic control can provide power to each pressure conversion valve, pilot control valve and other components, and can control the working state of each component. The electrical integrated control can be connected to the hydraulic control through electrical components; by collecting data from each pressure conversion valve, pilot control valve, pressure gauge 19, and flow meter 20, the working state of each actuator and the pressure, flow, and temperature of each position can be monitored in real time; and relevant action instructions can be issued to achieve integrated and visual control of the high and low pressure coupling device, which plays a role in monitoring and early warning.

[0049] The present invention provides a high-low pressure coupling device. When in use, the first fluid exchange tube 501, the second fluid exchange tube 601, and the third fluid exchange tube 701 need to be filled with water in advance. According to actual use conditions, the fluid in the first fluid exchange tube 501, the second fluid exchange tube 601, and the third fluid exchange tube 701 can be high-pressure cold water, high-pressure hot water, low-pressure cold water, and low-pressure hot water.

[0050] Affected by the height difference between the well and the underground, the low-pressure cold water generated by the well circulation refrigeration system 15 is converted into high-pressure cold water in the process of entering the first fluid distributor 1 through the first pipeline 11. The pressure on both sides of the first pressure conversion valve 502 is balanced through the first pilot control valve 801, and the low-pressure hot water in the first fluid exchange tube 501 is converted into high-pressure hot water. The first pressure conversion valve 502 is opened, and the high-pressure cold water pushes the high-pressure hot water in the first fluid exchange tube 501 to move to the right under the action of the pressure difference, and the first one-way switch valve 504 is opened to allow the high-pressure hot water to enter the second fluid distributor 2 and the second pipeline 12. According to the U-tube principle, under the push of high-pressure cold water, the high-pressure hot water returns to the well through the second pipeline 12 and becomes low-pressure hot water, and is finally transported back to the well circulation refrigeration system 15 by the well circulation pump 16 for cooling and waiting for the next cycle. This process is called a primary loop.

[0051] The pressure on both sides of the fourth pressure conversion valve 603 is balanced through the fifth pilot control valve 805. After the pressure is relieved by the pressure relief device 21, the high-pressure cold water in the second fluid exchange tube 601 is converted into low-pressure cold water. The fourth pressure conversion valve 603 and the fourth one-way switch valve 605 are opened in sequence, so that the low-pressure hot water delivered by the downhole circulation pump 17 through the third pipeline 13 and the third fluid distributor 3 enters the second fluid exchange tube 601, and pushes the low-pressure cold water in the tube to move to the left, so that the low-pressure cold water enters the fourth fluid distributor 4 and the fourth pipeline 14, and is finally supplied to the downhole air cooler 18 for use, thereby achieving downhole cooling. This process is called a secondary circuit.

[0052] When the first fluid exchange tube 501 is in the primary loop and the high-pressure cold water in the tube pushes the high-pressure hot water to run to the far right, the first pressure conversion valve 502, the first pilot control valve 801, and the first one-way switch valve 504 are closed to make the first fluid exchange tube 501 out of the primary loop; then the pressure on both sides of the fifth pressure conversion valve 702 is balanced through the third pilot control valve 803; at the same time, the third fluid exchange tube 701 is in the primary loop, and the low-pressure hot water in the tube is converted into high-pressure hot water, and the fifth pressure conversion valve 702 is opened. Under the action of the pressure difference, the high-pressure cold water pushes the high-pressure hot water in the third fluid exchange tube 701 to move to the right, and the fifth one-way switch valve 704 is opened to enter the second fluid distributor 2 and the second pipeline 12, and finally transported back to the well circulation refrigeration system 15 for cooling by the well circulation pump 16.

[0053] When the second fluid exchange tube 601 is in the secondary loop, and the low-pressure hot water in the tube pushes the low-pressure cold water to run to the leftmost side, the first fluid exchange tube 501 has completed the fluid exchange of the primary loop and is in standby mode; while the third fluid exchange tube 701 is performing the fluid exchange of the primary loop. At this time, the fourth pressure conversion valve 603, the fifth pilot control valve 805, and the fourth one-way switch valve 605 are closed in sequence; the pressure on both sides of the second pressure conversion valve 503 is balanced through the fourth pilot control valve 804; at the same time, the first fluid exchange tube 501 is in the secondary loop, and the high-pressure cold water in the tube is converted into low-pressure cold water. The second pressure conversion valve 503 and the second one-way switch valve 505 are opened in sequence, so that the low-pressure hot water delivered by the downhole circulation pump 17 through the third pipeline 13 and the third fluid distributor 3 enters the first fluid exchange tube 501, and pushes the low-pressure cold water in the tube to move to the left, so that the low-pressure cold water enters the fourth fluid distributor 4 and the fourth pipeline 14, and finally supplies the air cooler 18.

[0054] The same steps can make the second fluid exchange tube 601 in the primary circuit, the third fluid exchange tube 701 in the secondary circuit, and the first fluid exchange tube 501 in the standby state. In this way, there are always two groups of fluid exchange tubes in different working states, and the third group of fluid exchange tubes is in the standby state. By controlling the opening and closing sequence and the on-off time of each pressure conversion valve, pilot control valve, and one-way switch valve, the fluid conversion sequence and time of the first fluid exchange component 5, the second fluid exchange component 6, and the third fluid exchange component 7 can be controlled; thereby avoiding logical errors in the conversion sequence and preventing the conversion time of a certain group of fluid exchange components from being too long, resulting in excessive loss of cooling capacity. Finally, the cold water transported by the well circulation refrigeration system 15 is converted into low-pressure cold water through the high-low pressure coupling device and continuously supplied to the downhole air cooler 18, so that the downhole temperature is maintained within a certain value range; the low-pressure hot water in the well is continuously transported back to the well circulation refrigeration system 15 for cooling through the high-low pressure coupling device. In this way, through the continuous energy exchange of the high and low pressure coupling device, the high temperature environment underground can be cooled down, thereby ensuring the safety of underground workers and equipment operation.

[0055] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A high-low voltage coupling device, characterized in that: include: A first fluid distributor (1), connected to a first pipeline (11) extending from the well, is a water inlet component for high-pressure cold water; A second fluid distributor (2) is connected to a second pipeline (12) extending from the well and is a water outlet component for high-pressure hot water; A third fluid distributor (3), connected to a third pipeline (13) extending from the well, is a water inlet component for low-pressure hot water; A fourth fluid distributor (4), connected to a fourth pipeline (14) extending from the well, is a water outlet component for low-pressure cold water; A fluid exchange system, wherein the first fluid distributor (1), the second fluid distributor (2), the third fluid distributor (3) and the fourth fluid distributor (4) are respectively connected to the fluid exchange system; A pilot control assembly (8) is connected to the fluid exchange system via a pilot line (9), and the pilot control assembly (8) is used to adjust pressure balance.

2. A high-low voltage coupling device according to claim 1, characterized in that: The fluid exchange system comprises a first fluid exchange component (5), a second fluid exchange component (6) and a third fluid exchange component (7); the first fluid exchange component (5) comprises a first fluid exchange tube (501), a first pressure conversion valve (502), a second pressure conversion valve (503), a first one-way switch valve (504), a second one-way switch valve (505), a first T-shaped pipe (506) and a second T-shaped pipe (507); one end of the first fluid exchange tube (501) is connected to the first fluid distributor (1) and the fourth fluid distributor (4) respectively through the first pressure conversion valve (502) and the second pressure conversion valve (503); the other end of the first fluid exchange tube (501) is connected to the second fluid distributor (2) and the third fluid distributor (3) respectively through the first one-way switch valve (504) and the second one-way switch valve (505).

3. A high-low voltage coupling device according to claim 2, characterized in that: The second fluid exchange component (6) comprises a second fluid exchange tube (601), a third pressure conversion valve (602), a fourth pressure conversion valve (603), a third one-way switch valve (604), a fourth one-way switch valve (605), a third T-shaped pipe (606) and a fourth T-shaped pipe (607). One end of the second fluid exchange tube (601) is connected to the first fluid distributor (1) and the fourth fluid distributor (4) respectively through the third pressure conversion valve (602) and the fourth pressure conversion valve (603). The other end of the second fluid exchange tube (601) is connected to the second fluid distributor (2) and the third fluid distributor (3) respectively through the third one-way switch valve (604) and the fourth one-way switch valve (605).

4. A high-low voltage coupling device according to claim 3, characterized in that: The third fluid exchange component (7) comprises a third fluid exchange tube (701), a fifth pressure conversion valve (702), a sixth pressure conversion valve (703), a fifth one-way switch valve (704), a sixth one-way switch valve (705), a fifth T-shaped pipe (706) and a sixth T-shaped pipe (707). One end of the third fluid exchange tube (701) is connected to the first fluid distributor (1) and the fourth fluid distributor (4) respectively through the fifth pressure conversion valve (702) and the sixth pressure conversion valve (703), and the other end of the third fluid exchange tube (701) is connected to the second fluid distributor (2) and the third fluid distributor (3) respectively through the fifth one-way switch valve (704) and the sixth one-way switch valve (705).

5. A high-low voltage coupling device according to claim 4, characterized in that: The pilot control assembly (8) comprises a first pilot control valve (801), a second pilot control valve (802) and a third pilot control valve (803); the first pilot control valve (801) is connected to a fourth pilot control valve (804) via a first pipeline (807); the second pilot control valve (802) is connected to a fifth pilot control valve (805) via a second pipeline (808); the third pilot control valve (803) is connected to a sixth pilot control valve (806) via a third pipeline (809); the first pilot control valve (801), the second pilot control valve (802) and the third pilot control valve (803) are connected via a fourth pipeline (810); the fourth pilot control valve (804), the fifth pilot control valve (805) and the sixth pilot control valve (806) are connected via a fifth pipeline (811).

6. A high-low voltage coupling device according to claim 5, characterized in that: The pilot line (9) comprises a first pilot line (901), a second pilot line (902), a third pilot line (903), a fourth pilot line (904) and a fifth pilot line (905); two ends of the first pilot line (901) are respectively connected to the first fluid distributor (1) and the fourth line (810); two ends of the second pilot line (902) are respectively connected to the first fluid exchange tube (501) and the first line (807); two ends of the third pilot line (903) are respectively connected to the second fluid exchange tube (601) and the second line (808); two ends of the fourth pilot line (904) are respectively connected to the third fluid exchange tube (701) and the third line (809); and two ends of the fifth pilot line (905) are respectively connected to the fourth fluid distributor (4) and the fifth line (811).

7. A high-low voltage coupling device according to claim 1, characterized in that: The first pipeline (11), the second pipeline (12), the third pipeline (13) and the fourth pipeline (14) are all installed with a pressure gauge (19) and a flow meter (20).

8. A high-low voltage coupling device according to claim 1, characterized in that: This device, together with an uphole circulating refrigeration system (15), an uphole circulating pump (16), a downhole circulating pump (17), a downhole air cooler (18) and a pressure relief device (21), forms a whole cooling system; the first pipeline (11) and the second pipeline (12) are connected to the uphole circulating refrigeration system (15) and the uphole circulating pump (16), the third pipeline (13) and the fourth pipeline (14) are connected to the downhole circulating pump (17) and the downhole air cooler (18), and the fourth pipeline (14) is connected to the pressure relief device (21).

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