A high voltage switch cabinet with fire protection function

Abstract

The present application discloses a high-voltage switch cabinet with fire prevention function, which belongs to the technical field of high-voltage switch cabinets. It mainly includes a cabinet body, the upper end of which is provided with a top plate, the back of which is provided with a back plate, and the back plate is provided with an air outlet pipe connected to the cabinet body; a gas storage tank, the gas storage tank has an air inlet and an air return port; an air intake pump and an air intake pipe, the air intake pipe connects the air inlet with the input end of the air intake pump; a main pipe, the main pipe is connected to the output end of the air intake pump, and multiple groups of pipes are connected to the main pipe; a heat exchange mechanism, the inlet of the heat exchange mechanism is connected to the air outlet pipe; and an air return mechanism. The high-voltage switch cabinet with fire prevention function of the present application can replace the hot air flow in the cabinet body through the circulation of gas, which can not only play a role in cooling the cabinet body, but also replace the gas in the cabinet body with carbon dioxide gas, thereby eliminating the occurrence of fire from the source, thereby cutting off the possibility of fire in the cabinet body from the source.

Description

Technical Field

[0001] The present application relates to the technical field of high-voltage switch cabinets, and in particular to a high-voltage switch cabinet with a fire protection function. Background Art

[0002] High-voltage switchgear refers to one of the 3.6-40.5kV AC switchgear and control equipment. It is generally composed of high-voltage circuit breakers, high-voltage load switches, high-voltage contactors, high-voltage fuses, high-voltage disconnectors, high-voltage grounding switches, high-voltage transformers and station transformers and other high-voltage electrical equipment, as well as related control, measurement, protection, adjustment devices, internal connectors, accessories, housings and support parts. It is a complete set of high-voltage power distribution equipment. High-voltage switchgear plays the role of switching, control or protection in power generation, transmission, distribution, power conversion and consumption of power systems. High-voltage switchgear is widely used in various power systems, such as power plants, substations, industrial and mining enterprises, urban distribution networks, etc. It is an important part of the power system and is of great significance to ensure the reliability and safety of power supply. High-voltage switchgear is an intelligent power distribution equipment in the power system, suitable for cooperation with smart grids and new power systems, with functions such as fault analysis and data analysis. The interior of the high-voltage switchgear contains a large number of cables, wires and electrical components made of environmentally friendly materials, which are low-carbon, energy-saving, and reduce energy consumption and pollution. However, the above components are flammable materials. Once a fire occurs, it will not only cause equipment damage, but also may trigger a chain reaction, causing the entire power system to be paralyzed. Therefore, it is necessary to carry out fire prevention treatment on the high-voltage switchgear; In order to improve the reliability and safety of power distribution equipment, the patent with publication number CN219419940 U specifically discloses a high-voltage switch cabinet. The patent achieves fire prevention and cooling by setting a fireproof shell, while keeping the inside of the switch cabinet dry, avoiding the humid environment from affecting the operation of the internal electrical components of the switch cabinet, and achieving the purpose of monitoring and alarming the inside of the switch cabinet; During the implementation of the above-mentioned patent, although the occurrence of fire in the high-voltage switch cabinet and the spread of fire outside the high-voltage switch cabinet can be reduced to a certain extent, if the alarm is called after the fire occurs, it will undoubtedly delay the timely fire fighting. How to control the occurrence of fire in the high-voltage switch cabinet at the source has undoubtedly become a problem that needs to be solved urgently by technical personnel in this field.

[0003] It should be noted that the above information disclosed in this background technology section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute the prior art. Summary of the invention

[0004] Based on the above problems existing in the prior art, the problem to be solved by the present application is to provide a high-voltage switch cabinet with a fire protection function, so as to achieve the effect of controlling the occurrence of fire in the high-voltage switch cabinet at the source.

[0005] The technical solution adopted by the present application to solve its technical problems is: a high-voltage switch cabinet with a fireproof function, comprising a cabinet, a top plate is arranged at the upper end of the cabinet, a back plate is arranged at the back of the cabinet, and an air outlet pipe connected to the cabinet is arranged on the back plate; a gas storage tank, carbon dioxide gas is stored in the gas storage tank, and the gas storage tank has an air inlet and an air return port; an air intake pump, the air intake pump is mounted on the top plate; an air intake pipe, the air intake pipe connects the air inlet with the input end of the air intake pump; a main pipe, the main pipe is connected to the output end of the air intake pump, and multiple groups of branch pipes are connected to the main pipe, and the branch pipes pass through the top plate and extend into the interior of the cabinet; a heat exchange mechanism, the inlet of the heat exchange mechanism is connected to the air outlet pipe; a first air return pipe, the first air return pipe is connected to the outlet of the heat exchange mechanism; a return pump, the input end of the return pump is connected to the first return pipe; a second air return pipe, the second air return pipe is connected to the output end of the return pump, and the second air return pipe is connected to the return port.

[0006] Furthermore, a three-way valve is provided between the second air return pipe and the air return port, the three-way valve having a first end connected to the second air return pipe and a second end connected to the air return port, and the three-way valve also has a third end for exhausting gas.

[0007] Furthermore, the main pipe is provided with a first pressure gauge and an air inlet valve, and the second air return pipe is provided with a second pressure gauge and an air return valve.

[0008] Furthermore, the heat exchange mechanism includes a heat exchange box installed on the back plate, the heat exchange box having an inlet and an outlet, the inlet is connected to the air outlet pipe, and the outlet is connected to the first return air pipe; a accommodating chamber is provided inside the heat exchange box, a flow pipe is provided inside the accommodating chamber, and the flow pipe is used to connect the inlet and the outlet, and cooling water is provided at the bottom of the heat exchange box.

[0009] Furthermore, a heat exchange fan is provided on the top of the heat exchange box.

[0010] Furthermore, the heat exchanger box is provided with a winding assembly, and the winding assembly includes a winding seat installed at the upper end of the outer side of the heat exchanger box, a motor is installed on the winding seat, and a winding shaft is installed on the output end of the motor, the winding shaft is installed with the heat exchanger box bearing, and a winding drum is provided on the outer ring of the winding shaft; the flow pipe is divided into a coil connected with the box inlet, a vertical pipe connected with the upper end of the coil, and a winding pipe connected with the upper end of the vertical pipe, the winding pipe is wound on the winding drum, the end of the winding pipe is connected with a tail pipe, and the tail pipe is connected with the box outlet.

[0011] Furthermore, a guide assembly is provided inside the heat exchanger box, and the guide assembly includes a motor installed on the heat exchanger box, a screw is installed on the output end of the motor, two sets of seat bodies are installed on the heat exchanger box, and the screw is installed on the seat body bearings; a nut is provided on the screw for transmission, and a guide sleeve is installed on the nut.

[0012] Furthermore, the heat exchanger box is provided with a spray assembly, and the spray assembly includes a spray seat installed at the bottom outer side of the heat exchanger box, and a spray pump is installed on the spray seat, and the input end of the spray pump is connected to the bottom pipe of the heat exchanger box; the output end of the spray pump is connected to a spray pipe, and the upper end of the spray pipe is connected to two groups of diversion pipes, the diversion pipes extend into the top of the heat exchanger box and are respectively located on both sides of the winding drum, the diversion pipes are connected to multiple groups of extension pipes, and the extension pipes are connected to nozzles.

[0013] Furthermore, a thermometer is provided on the heat exchange box.

[0014] Furthermore, a gas concentration detector is provided in the second air return pipe.

[0015] The present application provides a high-voltage switch cabinet with fire protection function, which has the following beneficial effects: 1. A gas storage tank containing carbon dioxide gas is provided, and the carbon dioxide gas is introduced into the interior of the cabinet and refluxed into the gas storage tank to realize gas circulation. Thus, the hot air flow in the cabinet can be replaced through the gas circulation, which can not only cool the cabinet, but also replace the gas in the cabinet with carbon dioxide gas, thereby eliminating the occurrence of fire from the source, cutting off the possibility of fire in the cabinet from the source, and increasing the safety of the cabinet during operation.

[0016] 2. By setting a heat exchange box with cooling water placed at the bottom and a heat exchange fan placed at the top, the circulating carbon dioxide pipeline can be placed in the heat exchange box to achieve cooling of the carbon dioxide gas.

[0017] 3. By providing a flow pipe that can be rolled up and unfolded, the cooling method can be flexibly selected according to the temperature of the cooling water, so that the carbon dioxide gas can obtain the best cooling effect.

[0018] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 This is an overall schematic diagram of a high-voltage switch cabinet with fire protection function in this application Figure 1 ; Figure 2 This is an overall schematic diagram of a high-voltage switch cabinet with fire protection function in this application Figure 2 ; Figure 3 for Figure 1 Schematic diagram of the local structure at A in the middle; Figure 4 for Figure 2 Schematic diagram of the local structure at B in the middle; Figure 5 for Figure 1 Schematic diagram of the internal structure of the heat exchange box; Figure 6 for Figure 2 Schematic diagram of the back structure of the middle heat exchange box; Figure 7 for Figure 5 Schematic diagram of the local structure at C in the middle; Figure 8 for Figure 5 Schematic diagram of the local structure at D in the middle; Fig. 9 for Figure 5 Schematic diagram of the local structure at E in the middle; Fig.10 for Figure 6 Schematic diagram of the local structure at F in the middle; Among them, the reference numerals in the figure are: 1. Cabinet body; 11. Top plate; 12. Back plate; 13. Exhaust pipe; 2. Gas storage mechanism; 21. Bracket; 22. Gas storage tank; 23. Air inlet; 24. Air return port; 3. Heat exchange mechanism; 31. Heat exchange box; 32, winding assembly; 321, winding seat; 322, motor; 323, winding drum; 324, winding tube; 325, vertical tube; 326, coil; 327, tail tube; 328, box outlet; 329, box inlet; 33. Spray assembly; 331. Spray seat; 332. Spray pipe; 333. Diverter pipe; 334. Extension pipe; 335. Spray head; 336. Spray pump; 34. guide assembly; 341. motor; 342. lead screw; 343. seat body; 344. guide sleeve; 35. Thermometer; 37. Heat exchange fan; 4. Intake mechanism; 41. Intake pipe; 42. Main pipe; 43. Branch pipe; 44. Intake pump; 45. First pressure gauge; 46. Intake valve; 5. Air return mechanism; 51. Support plate; 52. First air return pipe; 53. Air return pump; 54. Second air return pipe; 55. Second pressure gauge; 56. Air return valve. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0022] Example 1 like Figure 1 As shown, the present application provides a high-voltage switch cabinet with fire prevention function, including a cabinet 1, which is the high-voltage switch cabinet in the present application. The cabinet 1 is generally placed in power plants, substations, urban distribution stations and other places for current control. In the present application, the cabinet 1 is an integrally sealed structure. Except for the specially arranged ventilation windows, the interior of the cabinet 1 is completely isolated from the outside, and in the initial state, the ventilation windows are closed; At the same time, a gas storage mechanism 2 is provided on one side of the cabinet 1. The gas storage mechanism 2 has a bracket 21 and a gas storage tank 22 fixedly mounted on the bracket 21. The gas storage tank 22 is used to store carbon dioxide gas, so as to introduce carbon dioxide into the interior of the cabinet 1 to replace the oxygen in the cabinet 1, thereby preventing the occurrence of fire or effectively extinguishing the fire when it occurs; like Figure 1and Figure 3 As shown, a top plate 11 is provided at the upper end of the cabinet 1, and an air intake mechanism 4 is provided on the top plate 11. The air intake mechanism 4 includes an air intake pump 44 fixedly mounted on the top plate 11, and an air intake port 23 is provided on the air storage tank 22. An air intake pipe 41 is connected between the air intake port 23 and the air intake pump 44, so that the carbon dioxide in the air storage tank 22 can be discharged through the air intake pump 44; At the same time, the outlet of the air intake pump 44 is connected to a main pipe 42, and a plurality of branch pipes 43 are connected to the main pipe 42. The branch pipes 43 pass through the top plate 11 and penetrate into the interior of the cabinet 1, so that carbon dioxide is introduced from multiple places on the top of the cabinet 1 through the branch pipes 43, which is conducive to the complete replacement of oxygen. In order to discharge the displaced oxygen, Figure 2 and Figure 4 As shown, a back plate 12 is provided on the cabinet 1, and an air outlet pipe 13 is connected to the back plate 12, and the air outlet pipe 13 is used to discharge the gas inside the cabinet 1; Meanwhile, in this embodiment, a return air mechanism 5 is provided on the air outlet pipe 13, and the return air mechanism 5 is used to recycle and reuse carbon dioxide. The return air mechanism 5 includes a first return air pipe 52 connected to the air outlet pipe 13, and a support plate 51 is fixedly mounted on the back plate 12, and a return air pump 53 is fixedly mounted on the support plate 51, and the input end of the return air pump 53 is connected to the first return air pipe 52; At the same time, the output end of the return air pump 53 is connected to a second return air pipe 54, and a return air port 24 is provided on the gas storage tank 22. The second return air pipe 54 is connected to the return air port 24, so that carbon dioxide can be guided back to the gas storage tank 22 for recovery through the first return air pipe 52, the return air pump 53 and the second return air pipe 54. It should be noted that, in order to discharge the oxygen in the initial stage, a three-way valve (not shown in the figure) is provided between the second air return pipe 54 and the air return port 24. The three-way valve has a first end connected to the second air return pipe 54 and a second end connected to the air return port 24. The three-way valve also has a third end for discharging gas. Therefore, in the initial state, the first end is connected to the third end so as to discharge the oxygen in the cabinet 1 into the air as much as possible to prevent affecting the purity of the carbon dioxide recovered in the subsequent cycle. After the oxygen is discharged for a period of time, the first end and the third end are connected to facilitate the subsequent recovery of carbon dioxide; Preferably, a gas concentration detector is provided in the second gas return pipe 54, and the concentration of the carbon dioxide gas in the second gas return pipe 54 is collected by the gas concentration detector to determine whether to discharge or recycle; It should be noted that a PLC control system is provided in the present application to coordinate the collaborative work of various electrical components; Meanwhile, in the present application, in order to control the pressure of the gas in the cabinet 1, a first pressure gauge 45 and an air inlet valve 46 are provided on the main pipe 42, and a second pressure gauge 55 and an air return valve 56 are provided on the second air return pipe 54, so that the pressure of the gas in the cabinet 1 is constantly adjusted through the coordinated work of the first pressure gauge 45 and the air inlet valve 46, and the second pressure gauge 55 and the air return valve 56, so that the cabinet 1 is at a normal working pressure; To summarize, a temperature sensor can be provided in the cabinet 1. When it is detected that the temperature in the cabinet 1 reaches a preset threshold, the air intake pump 44 and the air return pump 53 are started to introduce the carbon dioxide gas in the gas storage tank 22 into the cabinet 1, and the gas in the cabinet 1 is discharged to realize gas circulation. Thus, the hot air flow in the cabinet 1 can be replaced through the gas circulation, which can not only cool the cabinet 1, but also replace the gas in the cabinet 1 with carbon dioxide gas, thereby eliminating the occurrence of fire from the source, thereby cutting off the possibility of fire in the cabinet 1 from the source and increasing the safety of the cabinet 1 during operation.

[0023] Example 2 During the above-mentioned carbon dioxide gas circulation process, it continuously contacts with the hot air flow in the cabinet 1, so that the temperature of the carbon dioxide gas is relatively high. In order to better guide and dissipate heat in the cabinet 1, as shown in FIG. Figure 1-Figure 2 As shown, a heat exchange mechanism 3 is provided on one side of the cabinet 1, and the heat exchange mechanism 3 is used to cool the carbon dioxide gas in the circulation process; In this embodiment, the air outlet pipe 13 is no longer directly connected to the first air return pipe 52, but is connected through the heat exchange mechanism 3. Specifically: like Figure 2 As shown, the heat exchange mechanism 3 includes a heat exchange box 31 fixedly mounted on the back plate 12, and the heat exchange box 31 has an inlet 329 and an outlet 328, wherein the inlet 329 is connected to the outlet pipe 13, and the outlet 328 is connected to the first return pipe 52, so that the carbon dioxide gas can be introduced into the heat exchange box 31 for cooling and discharged after cooling; like Figure 5 and Figure 7-Figure 8 As shown, a receiving chamber (not marked in the figure) is provided inside the heat exchange box 31, and a flow pipe (not marked in the figure) is provided inside the receiving chamber. The flow pipe is used to connect the box inlet 329 and the box outlet 328 to transmit the carbon dioxide gas; At the same time, cooling water is provided at the bottom of the heat exchange box 31, and most of the flow pipe is located in the cooling water, so that the carbon dioxide gas flowing in the flow pipe can be cooled by heat exchange with the cooling water; At the same time, a heat exchange fan 37 is provided on the top of the heat exchange box 31, and the heat exchange fan 37 can extract the airflow of the heat exchange box 31, thereby reducing the temperature inside the heat exchange box 31, thereby indirectly dissipating the heat of the carbon dioxide gas flowing through the flow pipe; In this embodiment, the length of the flow pipe is relatively long, so that the carbon dioxide gas has sufficient heat dissipation time. However, because the heat in the heat exchange box 31 is mainly cooled by cooling water, a long period of heat exchange may increase the temperature of the cooling water, thereby reducing the heat exchange effect. In order to solve the above problems, Figure 5-Figure 8 As shown, a winding assembly 32 is provided on the heat exchange box 31, and the winding assembly 32 is used to set most of the flow pipe in the cooling water when the cooling water temperature is low, and to set most of the flow pipe near the heat exchange fan 37 when the cooling water temperature is high, so as to improve the cooling effect of the carbon dioxide gas and give the cooling water enough cooling time; The winding assembly 32 includes a winding seat 321 fixedly mounted on the upper end of the outer side of the heat exchange box 31, a motor 322 is fixedly mounted on the winding seat 321, and a winding shaft (not shown in the figure) is fixedly mounted on the output end of the motor 322. The winding shaft is bearing-mounted with the heat exchange box 31, so that the winding shaft can rotate under the drive of the motor 322; At the same time, a winding drum 323 is fixedly sleeved on the outer ring of the winding shaft, so that the winding drum 323 can rotate synchronously with the winding shaft; In this embodiment, the flow pipe is divided into a coil 326 connected to the tank inlet 329, a vertical pipe 325 connected to the upper end of the coil 326, and a reel 324 connected to the upper end of the vertical pipe 325. The reel 324 is rolled up on the reel drum 323, and the end of the reel 324 is connected to a tail pipe 327, and the tail pipe 327 is connected to the tank outlet 328. It can be understood that when the cooling water temperature is low, the coil 326 is longer and immersed in the cooling water. At this time, most of the flow pipe is in contact with the cooling water to achieve a better cooling effect. When the cooling water temperature is high, the motor 322 drives the winding drum 323 to rotate to reel up most of the flow pipe. At this time, the length of the coil 324 is longer and close to the heat exchange fan 37, so that a better cooling effect can also be achieved. In this embodiment, a thermometer 35 (see Figure 7 ), so that the temperature of the cooling water can be detected in time to obtain the timing of the above switching.

[0024] In order to make the flow pipe be evenly rolled up on the winding drum 323, Figure 5 and Figure 9-10As shown, a guide assembly 34 is provided inside the heat exchange box 31, and the guide assembly 34 includes a motor 341 fixedly mounted on the heat exchange box 31, a lead screw 342 is fixedly mounted on the output end of the motor 341, and two sets of seats 343 are fixedly mounted on the heat exchange box 31. The lead screw 342 and the seat 343 are bearing-mounted, so that the lead screw 342 can continuously rotate on the seat 343 under the drive of the motor 341; At the same time, a nut (not marked in the figure) is provided on the lead screw 342 for transmission, and a guide sleeve 344 is fixedly installed on the nut. The guide sleeve 344 is sleeved on the vertical pipe 325, so that when the flow pipe is wound and unwound, the guide sleeve 344 can move synchronously with the nut and drive the vertical pipe 325 to move, and then through the left and right movement of the guide sleeve 344, the flow pipe can be evenly sleeved on the winding drum 323, or evenly arranged in the cooling water, so that the carbon dioxide gas in the flow pipe can be better cooled.

[0025] In order to cool the cooling water with higher temperature, Figure 5 and Figure 7-Figure 8 As shown, a spray assembly 33 is provided on the heat exchange box 31, and the spray assembly 33 can guide the cooling water at the bottom of the heat exchange box 31 to a high position for spraying, and accelerate the cooling of the cooling water through the action of the heat exchange fan 37; The spray assembly 33 includes a spray seat 331 fixedly mounted on the outer bottom of the heat exchange box 31, and a spray pump 336 is fixedly mounted on the spray seat 331. The input end of the spray pump 336 is connected to the bottom pipe of the heat exchange box 31 to pump out the cooling water; A spray pipe 332 is connected to the output end of the spray pump 336, and two groups of diverter pipes 333 are connected to the upper end of the spray pipe 332. The diverter pipes 333 extend into the top of the heat exchange box 31 and are respectively located on both sides of the winding drum 323. At the same time, multiple groups of extension pipes 334 are connected to the diverter pipe 333, and a nozzle 335 is connected to the extension pipe 334. Therefore, under the action of the spray pump 336, cooling water can flow along the spray pipe 332, the diverter pipe 333, and the extension pipe 334, and be sprayed out from the nozzle 335 to spray the cooling water on the wound coil 324, so that the heat on the coil 324 can be taken away by the flowing cooling water. At the same time, the spraying of cooling water can accelerate the cooling of the cooling water by the heat exchange fan 37 to improve the cooling efficiency of the cooling water.

[0026] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high voltage switch cabinet with fire protection function, characterized in that: include: A cabinet (1), wherein a top plate (11) is arranged at the upper end of the cabinet (1), a back plate (12) is arranged at the back of the cabinet (1), and an air outlet pipe (13) connected to the cabinet (1) is arranged on the back plate (12); A gas storage tank (22), wherein carbon dioxide gas is stored inside the gas storage tank (22), and the gas storage tank (22) has an air inlet (23) and an air return port (24); An air intake pump (44), the air intake pump (44) being mounted on the top plate (11); An air intake pipe (41), the air intake pipe (41) being in communication with the air intake port (23) and an input end of the air intake pump (44); A main pipe (42), the main pipe (42) being connected to the output end of the air intake pump (44), the main pipe (42) being connected to a plurality of groups of pipes (43), the branch pipes (43) passing through the top plate (11) and extending into the interior of the cabinet (1); A heat exchange mechanism (3), the inlet of the heat exchange mechanism (3) being in communication with the air outlet pipe (13); a first air return pipe (52), the first air return pipe (52) being in communication with an outlet of the heat exchange mechanism (3); an air return pump (53), wherein an input end of the air return pump (53) is in communication with the first air return pipe (52); A second air return pipe (54), the second air return pipe (54) being in communication with an output end of the air return pump (53), the second air return pipe (54) being in communication with the air return port (24).

2. A high voltage switch cabinet with fire protection function according to claim 1, characterized in that: A three-way valve is provided between the second air return pipe (54) and the air return port (24), the three-way valve having a first end connected to the second air return pipe (54) and a second end connected to the air return port (24), and the three-way valve also having a third end for discharging gas.

3. The high-voltage switch cabinet with fire protection function according to claim 2 is characterized in that: The main pipe (42) is provided with a first pressure gauge (45) and an air intake valve (46), and the second air return pipe (54) is provided with a second pressure gauge (55) and an air return valve (56).

4. The high-voltage switch cabinet with fire protection function according to claim 1 is characterized in that: The heat exchange mechanism (3) comprises a heat exchange box (31) mounted on the back plate (12), the heat exchange box (31) having an inlet (329) and an outlet (328), the inlet (329) being in communication with the air outlet pipe (13), and the outlet (328) being in communication with the first air return pipe (52); The heat exchange box (31) is provided with a receiving chamber inside, and a flow pipe is provided inside the receiving chamber. The flow pipe is used to connect the box inlet (329) and the box outlet (328). Cooling water is provided at the bottom of the heat exchange box (31).

5. The high-voltage switch cabinet with fire protection function according to claim 4 is characterized in that: A heat exchange fan (37) is provided on the top of the heat exchange box (31).

6. The high-voltage switch cabinet with fire protection function according to claim 5, characterized in that: The heat exchange box (31) is provided with a winding assembly (32), the winding assembly (32) comprising a winding seat (321) mounted on the upper end of the outer side of the heat exchange box (31), a motor (322) mounted on the winding seat (321), a winding shaft mounted on the output end of the motor (322), the winding shaft being mounted on a bearing of the heat exchange box (31), and a winding drum (323) being provided on the outer ring sleeve of the winding shaft; The flow pipe is divided into a coil (326) connected to the box inlet (329), a vertical pipe (325) connected to the upper end of the coil (326), and a reel (324) connected to the upper end of the vertical pipe (325); the reel (324) is reeled on the reel drum (323); the end of the reel (324) is connected to a tail pipe (327); and the tail pipe (327) is connected to the box outlet (328).

7. The high-voltage switch cabinet with fire protection function according to claim 6 is characterized in that: A guide assembly (34) is provided inside the heat exchange box (31), the guide assembly (34) comprising a motor (341) mounted on the heat exchange box (31), a lead screw (342) being mounted on the output end of the motor (341), two sets of seat bodies (343) being mounted on the heat exchange box (31), the lead screw (342) being mounted on the seat bodies (343) by bearings; The lead screw (342) is provided with a nut for transmission, and a guide sleeve (344) is installed on the nut.

8. The high-voltage switch cabinet with fire protection function according to claim 7, characterized in that: The heat exchange box (31) is provided with a spray assembly (33), the spray assembly (33) comprising a spray seat (331) installed at the bottom of the outer side of the heat exchange box (31), a spray pump (336) being installed on the spray seat (331), and an input end of the spray pump (336) being connected to a bottom pipe of the heat exchange box (31); The output end of the spray pump (336) is connected to a spray pipe (332); the upper end of the spray pipe (332) is connected to two groups of shunt pipes (333); the shunt pipes (333) extend into the top of the heat exchange box (31) and are respectively located on both sides of the winding drum (323); the shunt pipes (333) are connected to multiple groups of extension pipes (334); and the extension pipes (334) are connected to a spray head (335).

9. The high-voltage switch cabinet with fire protection function according to claim 8, characterized in that: The heat exchange box (31) is provided with a thermometer (35).

10. The high-voltage switch cabinet with fire protection function according to claim 9, characterized in that: A gas concentration detector is provided in the second gas return pipe (54).

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