Switch cabinet for regulating and controlling internal temperature by utilizing geothermal resources

Abstract

The invention discloses a switch cabinet using geothermal resources for internal temperature regulation and control, the switch cabinet comprises a switch cabinet body and a buried pipe radiation heat exchange system, the buried pipe radiation heat exchange system comprises a single U-shaped heat exchanger, a deep buried pipe and an overground radiation heat exchange system, the single U-shaped heat exchanger is arranged underground, the outer side of the single U-shaped heat exchanger is provided with a heat insulation material, and the ground radiation heat exchange system is arranged on the ground. The ground radiation heat exchange system is arranged in the switch cabinet body, one side of the single U-shaped heat exchanger is connected with the ground radiation heat exchange system through a connecting piece, the other side of the single U-shaped heat exchanger is connected with the deep buried pipe through a turbine transmission assembly, and the deep buried pipe is of an annular closed structure and is filled with an oil medium; in a deep high-temperature environment, a medium in the deep buried pipe realizes self-circulation due to temperature and density difference, and generated kinetic energy is transmitted into the single U-shaped heat exchanger through the turbine transmission assembly so as to push fluid and transmit underground cold or heat into the switch cabinet body, so that temperature regulation and control in the switch cabinet body are realized. The device has the characteristics of being compact in structure, good in heat exchange effect, accurate in regulation and control and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal resource utilization, and in particular to a switch cabinet which utilizes geothermal resources to control internal temperature. Background Art

[0002] As a clean energy, shallow geothermal energy is widely exploited and utilized for its stability, sustainable utilization, and no geographical restrictions. It can be used as a cold source in summer and as a heat source in winter. As an intelligent control equipment, switchgear plays a vital role in power transmission and distribution and the current new energy power generation industry. The normal operation of its internal control unit provides important guarantees for the generation, transmission, transformation, distribution, and use of the entire power production and use. The impact of the ambient temperature inside the cabinet on the internal components of the switchgear cannot be ignored. When the temperature is too high, the mechanical strength and insulation performance of the conductor material will be reduced. When the temperature is too low, it will affect the performance and life of electronic devices such as chips and batteries. Therefore, when designing a switchgear, the thermal environment design inside the cabinet should be considered.

[0003] Existing switch cabinets mainly use built-in fans or radiators to dissipate heat or maintain a certain temperature for internal components. On the one hand, the need to exchange gas with the external environment increases the risk of solid particles invading the cabinet. On the other hand, the installation of fans or radiators will further increase the overall energy consumption of the cabinet itself and increase operating costs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a switch cabinet with compact structure, high heat exchange efficiency and precise control, which utilizes geothermal resources to control the internal temperature in view of the above-mentioned deficiencies in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A switch cabinet that utilizes geothermal resources for internal temperature control comprises a switch cabinet body and a buried pipe radiation heat exchange system, wherein the buried pipe radiation heat exchange system comprises a single U-shaped heat exchanger, a deep buried pipe and a ground radiation heat exchange system, wherein the single U-shaped heat exchanger is arranged underground, and a heat insulating material is arranged on the outer side of the single U-shaped heat exchanger, and the ground radiation heat exchange system is arranged in the switch cabinet body, one side of the single U-shaped heat exchanger is connected to the ground radiation heat exchange system through a connector, and the other side of the single U-shaped heat exchanger is connected to the deep buried pipe through a turbine transmission component, wherein the deep buried pipe is an annular closed structure, and the deep buried pipe is filled with an oil medium; in a deep high temperature environment, the oil medium in the deep buried pipe realizes self-circulation due to the density difference caused by the temperature distribution difference, and the generated kinetic energy is transmitted to the single U-shaped heat exchanger through the turbine transmission component, and promotes the flow of the fluid in the single U-shaped heat exchanger, so as to realize the underground cold or heat transmission into the switch cabinet body, thereby realizing the internal temperature control of the switch cabinet body.

[0007] As a further improvement of the present invention, the ground radiation heat exchange system includes: a water supply tank, a heat radiation pipe, a temperature sensor, a pressure sensor and a solenoid valve; the water supply tank is arranged on the top of the outer side of the switch cabinet, the heat radiation pipe is arranged inside the switch cabinet, the top of the heat radiation pipe passes through the switch cabinet and is connected to the water supply tank, and the bottom of the heat radiation pipe is connected to the single U-type heat exchanger through a connecting piece; a solenoid valve is provided on the heat radiation pipe, and the solenoid valve is close to the bottom of the switch cabinet to control the flow of the medium inside the system; the temperature sensor and the pressure sensor are both installed on the heat radiation pipe and close to the bottom of the switch cabinet.

[0008] As a further improvement of the present invention, the heat radiation pipe includes a first branch and a second branch; the first branch is arranged in a vertical direction, and the top of the first branch is connected to the water make-up tank, and the bottom of the first branch is connected to the pipe on one side of the single U-type heat exchanger through a connecting piece; the second branch is arranged in a serpentine shape in the switch cabinet, the top of the second branch is connected to the side of the first branch and is close to the top of the switch cabinet, and the bottom of the second branch is connected to the pipe on the other side of the single U-type heat exchanger through a connecting piece; the solenoid valve is arranged at the lower part of the second branch; the lower parts of the first branch and the second branch are both provided with a temperature sensor and a pressure sensor.

[0009] As a further improvement of the present invention, a drain pipe with a valve is further provided at the lower part of the first branch.

[0010] As a further improvement of the present invention, a side pipe connected to the first branch in the single U-type heat exchanger is connected to a side pipe of the deep buried pipe through a turbine transmission assembly; the turbine transmission assembly includes: a gear water pump, a transmission rod assembly and a turbine, the gear water pump is connected to the pipe of the single U-type heat exchanger, the turbine is connected to the pipe of the deep buried pipe, and the gear water pump and the turbine are connected through the transmission rod assembly.

[0011] As a further improvement of the present invention, the gear water pump includes a first gear and a second gear that are meshed with each other, and the second gear is connected to the input end of the gear water pump; the transmission rod assembly includes a first transmission rod and a second transmission rod; the turbine and the first transmission rod are transmitted by gears, and the matching point between the first transmission rod and the second transmission rod is set as a bite-like structure; the second transmission rod is connected to the first gear by a convex key.

[0012] As a further improvement of the present invention, electromagnetic adsorption is arranged inside the second transmission rod, and the first transmission rod and the second transmission rod are attached to each other through magnetic adsorption.

[0013] As a further improvement of the present invention, a spring is provided between the second transmission rod and the first gear; when electromagnetic adsorption is performed between the first transmission rod and the second transmission rod, the spring is stretched, and when the electromagnetic adsorption is cancelled, the second transmission rod is pulled back into the gear water pump by the elastic force of the spring.

[0014] As a further improvement of the present invention, an aluminum foil tape or a heat reflective film is adhered to the inner wall surface of the switch cabinet.

[0015] As a further improvement of the present invention, the thermal insulation material, the single U-shaped heat exchanger and the gear water pump are prefabricated as a whole by precast concrete pouring and then hoisted into the borehole.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] The switch cabinet of the present invention which utilizes geothermal resources for internal temperature control innovatively couples the deep closed buried pipe and the shallow buried pipe radiation heat exchange system and applies them in the thermal environment control process inside the switch cabinet. Based on the environmental protection concept of "only taking heat but not water", the internal thermal environment of the switch cabinet is connected with the underground constant temperature environment for the abundant and stable shallow geothermal resources. Under the premise of not polluting the underground environmental resources, the internal thermal environment of the switch cabinet is controlled throughout the year, thereby ensuring the normal operation of the switch cabinet.

[0018] In addition, the present invention utilizes the temperature difference between the deep geothermal environment and the shallow geothermal environment, realizes the self-circulating flow of the internal medium through the closed buried pipe, and transmits the power generated by the deep buried pipe to the shallow buried pipe through the turbine transmission assembly, which will realize the natural circulation cooling or heating inside the cabinet at zero energy cost. Compared with the existing setting of fans or high-power radiators to ensure the normal operation of the cabinet, it significantly reduces energy consumption and carbon emissions, and has outstanding substantial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structural principle of a switch cabinet that uses geothermal resources to control the internal temperature in a specific embodiment of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the structural principle of the connection between the turbine and the gear water pump at A in the middle;

[0021] Figure 3 It is a schematic diagram of the internal structure principle of the gear water pump in a specific embodiment of the present invention;

[0022] Legend: 1. Water supply tank; 2. Switch cabinet; 3. First branch; 4. Second branch; 5. First insulation sleeve; 6. First temperature sensor; 7. First pressure sensor; 8. Drain pipe; 9. Valve; 10. Connector; 11. Second temperature sensor; 12. Second pressure sensor; 13. Solenoid valve; 14. Insulation material; 15. Single U-type heat exchanger; 16. Precast concrete; 17. Gear water pump; 18. Backfill; 19. Deep buried pipe; 20. Second insulation sleeve; 21. Transmission rod assembly; 22. Turbine; 211. First transmission rod; 212. Second transmission rod; 171. First gear; 172. Second gear; 23. Spring. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0024] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0026] Example

[0027] like Figures 1 to 3As shown, the switch cabinet for internal temperature control using geothermal resources of the present invention includes a switch cabinet body 2 and a buried pipe radiation heat exchange system, the buried pipe radiation heat exchange system includes a single U-shaped heat exchanger 15, a deep buried pipe 19 and a ground radiation heat exchange system, the single U-shaped heat exchanger 15 is arranged underground, and a heat insulating material 14 is arranged on the outside of the single U-shaped heat exchanger 15, the ground radiation heat exchange system is arranged in the switch cabinet body 2, one side of the single U-shaped heat exchanger 15 is connected to the ground radiation heat exchange system through a connector 10, and the other side of the single U-shaped heat exchanger 15 is connected to the deep buried pipe 19 through a turbine transmission assembly, the deep buried pipe 19 is an annular closed structure, and the deep buried pipe 19 is filled with oil medium. In a deep high temperature environment, the oil medium in the deep buried pipe 19 realizes self-circulation due to the density difference caused by the temperature distribution difference, and the generated kinetic energy is transmitted to the single U-type heat exchanger 15 through the turbine transmission assembly, and promotes the flow of the fluid in the single U-type heat exchanger 15, so as to realize the underground cold or heat transfer to the switch cabinet 2, thereby realizing the internal temperature control of the switch cabinet 2. It can be understood that the functional components in the switch cabinet are set as conventional settings in the field, and will not be repeated here.

[0028] In this embodiment, the underground pipe radiation heat exchange system uses shallow and deep geothermal resources to control the internal thermal environment of the switch cabinet. Through the heat exchange between the medium in the pipe and the underground constant temperature layer, it can provide cooling to the cabinet in summer and heat in winter. By setting up deep closed underground pipes, the density difference caused by the temperature change of the medium in the pipe can be used to achieve self-circulation, and then the kinetic energy of the medium in the deep underground pipe is transferred to the fluid in the shallow underground pipe through the turbine transmission component, and the energy consumption required for the medium circulation is basically zero. At the same time, in the process of specific engineering design, it is calculated and tested that there is no need to set up a fan for heat dissipation, which can further reduce the gas exchange between the outside and the cabinet, thereby reducing the risk of damage to components caused by particulate matter invading the cabinet.

[0029] As shown in the figure, the ground radiation heat exchange system includes: a water supply tank 1, a heat radiation pipe, a temperature sensor, a pressure sensor and a solenoid valve 13. The water supply tank 1 is arranged on the top of the outer side of the switch cabinet 2, and the heat radiation pipe is arranged inside the switch cabinet 2. The top of the heat radiation pipe runs through the switch cabinet 2 and is connected to the water supply tank 1. The bottom of the heat radiation pipe is connected to the single U-type heat exchanger 15 through a connector 10. A solenoid valve 13 is provided on the heat radiation pipe, and the solenoid valve 13 is close to the bottom of the switch cabinet 2 to control the flow of the medium inside the system. The temperature sensor and the pressure sensor are both installed on the heat radiation pipe and close to the bottom of the switch cabinet 2. In this embodiment, the heat radiation pipe can be fixed to the inner wall surface of the switch cabinet 2 by a bracket.

[0030] like Figure 1As shown, the heat radiation pipeline includes a first branch 3 and a second branch 4. The first branch 3 is arranged in a vertical direction, and the top of the first branch 3 is connected to the water supply tank 1, and the bottom of the first branch 3 is connected to the pipe on one side of the single U-type heat exchanger 15 through a connector 10. The second branch 4 is arranged in a serpentine coil in the switch cabinet 2, and the top of the second branch 4 is connected to the side of the first branch 3 and close to the top of the switch cabinet 2; the top pipe of the second branch 4 is set with a 1% descending slope in the direction away from the water supply tank 1, and the bending radius of the second branch 4 should not be set too small to minimize the pipe resistance. The bottom of the second branch 4 is connected to the pipe on the other side of the single U-type heat exchanger 15 through a connector 10; the solenoid valve 13 is arranged at the bottom of the second branch 4. The first branch 3 and the second branch 4 are both provided with a temperature sensor and a pressure sensor at the bottom. Specifically, the first branch 3 is provided with a first temperature sensor 6 and a first pressure sensor 7 at the bottom, and the second branch 4 is provided with a second temperature sensor 11 and a second pressure sensor 12 at the bottom.

[0031] The first temperature sensor 6 and the second temperature sensor 11 are used to monitor the fluid medium temperature at the connection between the first branch 3 and the second branch 4 and the single U-type heat exchanger 15 respectively. When the temperature difference between the two places is small, it means that the fluid heat exchange is not sufficient, and the solenoid valve 13 can be adjusted to reduce the fluid flow rate; when the temperature difference between the two places is too large, it means that the internal temperature of the switch cabinet 2 is too high or too low, and the solenoid valve 13 should be adjusted to increase the fluid flow rate.

[0032] The first pressure sensor 7 and the second pressure sensor 12 are used to monitor the pressure in the pipeline at the connection between the first branch 3 and the second branch 4 and the single U-type heat exchanger 15 respectively. The installation positions of the first pressure sensor 7 and the second pressure sensor 12 should be maintained at the same horizontal line. When the value of one of the pressure sensors is too large, it indicates that the buried pipe radiation heat exchange system may be blocked and an alarm indication should be triggered; when the values ​​of the two pressure sensors are equal or close, it indicates that the fluid medium in the system is close to a static state and should be repaired in time.

[0033] In this embodiment, the water supply tank 1 is provided with sufficient purified water to replenish the medium to the heat radiation pipe at any time; when the volume of the fluid increases due to the increase of water temperature in the ground radiation heat exchange system, the water supply tank 1 can also accommodate expansion water, and when gas is generated in the ground radiation heat exchange system, it can also be collected in the water supply tank 1 for exhaust. The inside of the water supply tank 1 is treated with thermal insulation to improve the utilization rate of thermal energy.

[0034] like Figure 1 As shown, a drain pipe 8 with a valve 9 is also provided at the lower part of the first branch 3 to facilitate the discharge of the internal medium when the heat radiation pipe is inspected or replaced.

[0035] like Figure 1As shown, one side of the pipeline connected to the first branch 3 in the single U-shaped heat exchanger 15 is connected to one side of the pipeline of the deep buried pipe 19 through a turbine transmission assembly. The turbine transmission assembly includes: a gear water pump 17, a transmission rod assembly 21 and a turbine 22. The gear water pump 17 is connected to the pipeline of the single U-shaped heat exchanger 15, and the turbine 22 is connected to the pipeline of the deep buried pipe 19. The gear water pump 17 and the turbine 22 are connected in transmission through the transmission rod assembly 21.

[0036] In this embodiment, the buried depth of the single U-shaped heat exchanger 15 in the ground can be determined based on the ground temperature observation data of the work site and engineering calculations. Specifically, the heat exchanger close to the ground is in the underground temperature variable layer (generally less than 5 meters underground). Since the temperature of the temperature variable layer fluctuates greatly due to the influence of the surface environment and solar radiation, thermal insulation materials 14 need to be set around the heat exchanger for thermal insulation treatment to weaken heat transfer. The heat exchanger far from the ground is in the underground constant temperature layer (generally more than 5 meters underground), and is wrapped with prefabricated cast concrete 16 to enhance the heat exchange effect with the surrounding strata. The internal medium of the single U-shaped heat exchanger 15 is determined according to the work site. Purified water can be used in the south, and antifreeze needs to be added in the north to prevent freezing.

[0037] The heat insulation material 14, the single U-shaped heat exchanger 15 and the gear water pump 17 are prefabricated as a whole by prefabricating and pouring concrete 16, and then hoisted into the well. When drilling, when drilling to the preset bottom of the single U-shaped heat exchanger 15, the drill bit should be adjusted in time to make the transition aperture larger at the junction of the deep buried pipe 19 and the single U-shaped heat exchanger 15, which saves drilling costs on the one hand and facilitates the placement of the deep buried pipe 19 on the other hand. The deep part of the deep buried pipe 19 is buried in the underground high-temperature layer, and a small turbine 22 is provided in the deep buried pipe 19, which is close to the single U-shaped heat exchanger 15 and located in the constant temperature layer, and is connected to the gear water pump 17 through a transmission rod assembly 21. An insulation layer is provided outside the deep buried pipe 19, which is far away from the single U-shaped heat exchanger 15 and located in the constant temperature layer.

[0038] like Figure 2 and Figure 3 As shown, the gear water pump 17 includes a first gear 171 and a second gear 172 that mesh with each other, and the second gear 172 is connected to the input end of the gear water pump 17. The transmission rod assembly 21 includes a first transmission rod 211 and a second transmission rod 212; the turbine 22 and the first transmission rod 211 are driven by gears, and the first transmission rod 211 and the second transmission rod 212 are arranged at a bite-shaped structure. The material hardness of the bite of the second transmission rod 212 is slightly less than the material hardness of the bite of the first transmission rod 211. The second transmission rod 212 is connected to the first gear 171 by a convex key.

[0039] Furthermore, electromagnetic adsorption is provided in the second transmission rod 212, and the first transmission rod 211 and the second transmission rod 212 are attached to each other through magnetic adsorption.

[0040] like Figure 2 As shown, a spring 23 is provided between the second transmission rod 212 and the first gear 171. When electromagnetic adsorption is performed between the first transmission rod 211 and the second transmission rod 212, the spring 23 is stretched; when the electromagnetic adsorption is cancelled, the second transmission rod 212 is pulled back into the gear water pump 17 by the elastic force of the spring 23.

[0041] In this embodiment, aluminum foil tape or other heat reflective film is pasted on the inner wall surface of the switch cabinet 2 to weaken the heat transfer between the heat radiation pipe and the outside.

[0042] In this embodiment, the circulating medium in the deep buried pipe 19 uses lubricating oil or other oils with the same physical properties, which, on the one hand, acts as a flow medium to drive the turbine to rotate, and on the other hand, protects the gears.

[0043] Design and working principle of the present invention:

[0044] Based on the distribution characteristics of the formation temperature, a closed deep buried pipe 19 is set between the constant temperature layer at a shallower place underground and the high temperature layer at a deeper place, and a suitable amount of oil medium is filled in the pipe, and one side of the deep buried pipe 19 is insulated; in the deep high temperature environment, the density difference of the medium in the pipe caused by the temperature distribution difference will cause the medium to self-circulate, and the kinetic energy generated can be transmitted to the transmission rod assembly 21 in the form of mechanical energy through the turbine 22, and then converted into the kinetic energy of the fluid in the single U-type heat exchanger 15 through the gear water pump 17 matched with the transmission rod assembly 21, so that the single U-type heat exchanger 15 can transmit the cold or heat from the underground to the switch cabinet 2 in both summer and winter, and realize the control of the thermal environment in the switch cabinet at zero energy consumption cost.

[0045] It is understandable that in actual applications, there are usually more than one switch cabinet, and the corresponding geothermal drilling may be more than one. Therefore, in actual engineering applications, the parallel pipe network of heat radiation pipes and the parallel pipe network of underground heat exchangers can be designed according to the total heat exchange required by the specific number of switch cabinets to further meet the control requirements of the internal thermal environment of the switch cabinet. At the same time, in order to further enhance the heat transfer process in the heat radiation pipe and the switch cabinet, it can be considered to set heat sinks or other auxiliary radiation heat exchange devices around the heat radiation pipe.

[0046] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A switch cabinet that uses geothermal resources to control internal temperature, characterized in that: The invention comprises a switch cabinet (2) and a buried pipe radiation heat exchange system, wherein the buried pipe radiation heat exchange system comprises a single U-shaped heat exchanger (15), a deep buried pipe (19) and a ground radiation heat exchange system, wherein the single U-shaped heat exchanger (15) is arranged underground, and a heat insulating material (14) is arranged on the outside of the single U-shaped heat exchanger (15), and the ground radiation heat exchange system is arranged in the switch cabinet (2), and one side of the single U-shaped heat exchanger (15) is connected to the ground radiation heat exchange system through a connector (10), and the other side of the single U-shaped heat exchanger (15) is connected to the ground radiation heat exchange system through a turbine transmission assembly. The deep buried pipe (19) is connected to the deep buried pipe (19), which is an annular closed structure and is filled with oil medium. In a deep high-temperature environment, the oil medium in the deep buried pipe (19) realizes self-circulation due to the density difference caused by the temperature distribution difference, and the generated kinetic energy is transmitted to the single U-shaped heat exchanger (15) through the turbine transmission component, and promotes the flow of fluid in the single U-shaped heat exchanger (15), so as to realize the transmission of cold or heat from the underground to the switch cabinet (2), thereby realizing the internal temperature control of the switch cabinet (2).

2. The switch cabinet for internal temperature control using geothermal resources according to claim 1, characterized in that: The above-ground radiation heat exchange system comprises: a water supply tank (1), a heat radiation pipe, a temperature sensor, a pressure sensor and a solenoid valve (13); the water supply tank (1) is arranged on the top of the outer side of the switch cabinet (2), the heat radiation pipe is arranged inside the switch cabinet (2), the top of the heat radiation pipe passes through the switch cabinet (2) and is connected to the water supply tank (1), and the bottom of the heat radiation pipe is connected to the single U-shaped heat exchanger (15) through a connector (10); a solenoid valve (13) is arranged on the heat radiation pipe, and the solenoid valve (13) is close to the bottom of the switch cabinet (2) to control the flow of the medium inside the system; the temperature sensor and the pressure sensor are both installed on the heat radiation pipe and close to the bottom of the switch cabinet (2).

3. The switch cabinet for internal temperature control using geothermal resources according to claim 2, characterized in that: The heat radiation pipe comprises a first branch (3) and a second branch (4); the first branch (3) is arranged in a vertical direction, and the top of the first branch (3) is connected to the water supply tank (1), and the bottom of the first branch (3) is connected to a pipe on one side of a single U-shaped heat exchanger (15) through a connector (10); the second branch (4) is arranged in a serpentine shape in the switch cabinet (2), the top of the second branch (4) is connected to the side of the first branch (3) and is close to the top of the switch cabinet (2), and the bottom of the second branch (4) is connected to a pipe on the other side of the single U-shaped heat exchanger (15) through a connector (10); the solenoid valve (13) is arranged at the bottom of the second branch (4); the first branch (3) and the second branch (4) are both provided with a temperature sensor and a pressure sensor at the bottom.

4. The switch cabinet for internal temperature control using geothermal resources according to claim 3 is characterized in that: A drainage pipeline (8) with a valve (9) is also provided at the lower part of the first branch (3).

5. The switch cabinet for internal temperature control using geothermal resources according to claim 3, characterized in that: A side pipe connected to the first branch (3) in the single U-shaped heat exchanger (15) is connected to a side pipe of the deep buried pipe (19) via a turbine transmission assembly; the turbine transmission assembly comprises a gear water pump (17), a transmission rod assembly (21) and a turbine (22); the gear water pump (17) is connected to the pipe of the single U-shaped heat exchanger (15), the turbine (22) is connected to the pipe of the deep buried pipe (19), and the gear water pump (17) and the turbine (22) are connected in transmission via the transmission rod assembly (21).

6. The switch cabinet for internal temperature control using geothermal resources according to claim 5, characterized in that: The gear water pump (17) comprises a first gear (171) and a second gear (172) meshing with each other, and the second gear (172) is connected to the input end of the gear water pump (17); the transmission rod assembly (21) comprises a first transmission rod (211) and a second transmission rod (212); the turbine (22) and the first transmission rod (211) are driven by gears, and the first transmission rod (211) and the second transmission rod (212) are arranged at a position where they meet to form a bite-shaped structure; the second transmission rod (212) and the first gear (171) are connected by a convex key.

7. The switch cabinet for controlling internal temperature by utilizing geothermal resources according to claim 6, characterized in that: Electromagnetic adsorption is arranged inside the second transmission rod (212), and the first transmission rod (211) and the second transmission rod (212) are attached to each other through magnetic adsorption.

8. The switch cabinet for controlling internal temperature by utilizing geothermal resources according to claim 7, characterized in that: A spring (23) is provided between the second transmission rod (212) and the first gear (171); when electromagnetic adsorption is performed between the first transmission rod (211) and the second transmission rod (212), the spring (23) is stretched; when the electromagnetic adsorption is cancelled, the second transmission rod (212) is pulled back into the gear water pump (17) by the elastic force of the spring (23).

9. The switch cabinet for controlling internal temperature by utilizing geothermal resources according to any one of claims 1 to 8, characterized in that: Aluminum foil tape or heat reflective film is adhered to the inner wall surface of the switch cabinet (2).

10. The switch cabinet for controlling internal temperature by utilizing geothermal resources according to any one of claims 5 to 8, characterized in that: The heat insulating material (14), the single U-shaped heat exchanger (15) and the gear water pump (17) are prefabricated as a whole by prefabricating and pouring concrete (16), and then hoisted into the borehole.

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