Electric power cabinet with liquid cooling waste heat recovery and heat dissipation functions

Abstract

The invention discloses an electric power cabinet with liquid cooling waste heat recovery and heat dissipation functions, which comprises a switch cabinet body, a cabinet door is rotatably mounted on the front surface of the switch cabinet body through hinges, a transparent plate is arranged on the cabinet door, and heat dissipation holes are formed in the rear side of the switch cabinet body; the cold supply module is arranged on the inner wall of the top of the switch cabinet body; the two PCM heat energy storage mechanisms are arranged on the inner walls of the two sides of the switch cabinet body and matched with the cold supply module; the device comprises two sliding rails, sliding blocks are installed in the two sliding rails in a sliding mode, the same installation frame plate is installed between the two sliding blocks, multiple sets of circuit breaker assemblies are arranged on the inner side of the installation frame plate, three radiant panels are embedded in the installation frame plate, and the three radiant panels are close to the electric shock positions of the multiple sets of circuit breaker assemblies. According to the device, waste heat can be recycled through thermoelectric recovery, energy is saved, a new material (graphene / PCM composite material) is adopted for phase change heat storage, waste heat is absorbed and recycled, and efficient heat dissipation is achieved through innovation of a modular structure and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power switch control, in particular to a power cabinet with liquid cooling and waste heat recovery and heat dissipation functions. BACKGROUND

[0002] The power cabinet is also known as a power switch cabinet, which is a switch device for power supply or power distribution and is used for circuit control. It is widely used in power plants, petroleum, chemical industry, metallurgy, textile, high-rise building and other industries as power transmission, power distribution and power conversion. The power cabinet is built-in with circuit breakers and other devices for controlling the on-off of the primary circuit.

[0003] Publication No. CN109599780B discloses a medium and high voltage switch cabinet, which comprises a cable compartment, a busbar compartment, a circuit breaker compartment and a control compartment. The circuit breaker compartment is built-in with a circuit breaker, an incoming line contact box and an outgoing line contact box. The circuit breaker is built-in with a closing and opening mechanism, which is composed of a bulletproof device, an electromagnetic driver, an insulating cylinder and a vacuum bubble fixedly connected in the axial direction. A damping hole is provided on the piston of the bulletproof device, and a drainage device and a flow resistance device are connected thereto. The drainage device is triggered to drain when the circuit breaker is closed, eliminating the promoting force of the circuit breaker moving contact closing bounce. The flow resistance device makes the damping medium flowing through the drainage device only flow to the rodless cavity, so that the bulletproof device absorbs the energy of the moving contact bounce and eliminates the promoting force of the closing bounce, thereby preventing the closing bounce of the circuit breaker moving contact and avoiding the occurrence of closing bounce arc.

[0004] The existing technology has low waste heat recovery efficiency: the traditional liquid cooling only transfers heat and does not realize heat-electricity direct conversion, the energy utilization rate is insufficient, and the heat dissipation is passive response: depends on external cold source or fixed heat dissipation path, the heat dissipation effect is not good. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, the present application provides a power cabinet with liquid cooling and waste heat recovery and heat dissipation functions, which solves the problems of low waste heat recovery efficiency in the prior art: the traditional liquid cooling only transfers heat, does not realize heat-electricity direct conversion, the energy utilization rate is insufficient, and the heat dissipation is passive response: depends on external cold source or fixed heat dissipation path, the heat dissipation effect is not good.

[0006] To solve the above technical problems, the present application provides the following technical scheme: A power cabinet with liquid cooling and waste heat recovery and heat dissipation functions, comprising: A switch cabinet body, a cabinet door is rotatably installed on the front face of the switch cabinet body through a hinge, a transparent plate is arranged on the cabinet door, and a heat dissipation hole is arranged on the rear side of the switch cabinet body; A cooling module is arranged on the top inner wall of the switch cabinet body; Two PCM thermal energy storage mechanisms are arranged on the inner walls of the two sides of the switch cabinet body and are matched with the cooling module. Two sliding rails are slidably installed with sliding blocks, and the same mounting plate is installed between the two sliding blocks. The inner side of the mounting plate is provided with multiple circuit breaker assemblies, and three radiation plates are embedded on the mounting plate. The three radiation plates are close to the live wire position of the multiple circuit breaker assemblies. The back of the three radiation plates is pasted with multiple thermoelectric pieces through heat-conducting glue. The multiple thermoelectric pieces are connected in series. The thermoelectric piece is a BiTe3-based flexible thermoelectric piece (single piece size 50mmx50mmx2mm), and the surface is covered with an aluminum nitride insulating layer. A control box is arranged on the bottom inner wall of the switch cabinet body and is connected with the multiple thermoelectric pieces.

[0007] Preferably, the inside of the control box is provided with a battery, a control chip (STMH), which is connected with each module through a flexible FPC wire, and the multiple thermoelectric pieces are connected with the battery. The control chip is connected with a controller and a temperature sensor.

[0008] Preferably, the cooling module includes a cooling liquid storage box, and multiple mounting rods are fixedly installed on the top of the cooling liquid storage box and are fixedly installed on the top inner wall of the switch cabinet body. The top of the cooling liquid storage box is provided with a supplement port and a liquid pump. The outlet of the liquid pump is communicated with a cross pipe. One end of the cross pipe is communicated with a top cooling pipe. The top cooling pipe is curvedly coiled at the bottom of the cooling liquid storage box and is communicated with the other end of the cooling liquid storage box. A first flow electromagnetic valve is arranged on the top cooling pipe. Two refrigerators are embedded in the inner side of the cooling liquid storage box.

[0009] Preferably, the other two ends of the cross pipe are communicated with two liquid supply pipes, and the second flow electromagnetic valve is arranged on the two liquid supply pipes.

[0010] Preferably, the two PCM thermal energy storage mechanisms include two heat storage boxes, which are fixedly installed on the inner walls of the two sides of the switch cabinet body. The inner walls of the two heat storage boxes are curvedly wound with side cooling pipes. One end of the two side cooling pipes is communicated with the two second flow electromagnetic valves. The other end of the two side cooling pipes is communicated with the top side of the cooling liquid storage box. The outer sides of the two heat storage boxes are fixedly installed with sealing covers. The inner sides of the two heat storage boxes are provided with PCM layers. The two sealing covers are provided with honeycomb plates.

[0011] Preferably, the PCM layer is a paraffin graphene composite phase change material, and the inner side of the side cooling pipe is embedded with the PCM layer.

[0012] Preferably, the inner walls of the top cooling pipe and the side cooling pipe are sprayed with a graphene nanometer coating with a thickness of 50μm to reduce the flow resistance.

[0013] Preferably, the inner side of the switch cabinet body is fixedly provided with a chamber isolation plate, the chamber isolation plate and the inner side of the switch cabinet body form a heat dissipation cavity, a plurality of heat dissipation holes are in communication with the heat dissipation cavity, and the heat dissipation surfaces of the two refrigerators both extend through the chamber isolation plate and reach the position of the heat dissipation cavity.

[0014] Preferably, the chamber isolation plate is provided with a heat dissipation rectangular hole, the outer side of the chamber isolation plate is provided with a sealing groove, the inner side of the mounting rack plate is fixedly provided with a magnetic sealing strip, and the magnetic sealing strip and the sealing groove are attracted to each other and are in sealed connection.

[0015] Preferably, the two sides of the mounting rack plate are both provided with a plurality of side communication holes, and the two sides of the mounting rack plate are both provided with handle holes.

[0016] Preferably, the inner side of the slide rail is fixedly provided with a limiting rod, and the slide block is in sliding connection with the inner wall of the slide rail through the slide block.

[0017] Preferably, the radiation plate is composed of a 5mm copper plate and a 1mm black chrome coating, and the thermoelectric sheet is attached to the back of the radiation plate, so that the heat in the cabinet is absorbed through heat radiation and heat conduction.

[0018] Compared with the prior art, the application can achieve the following beneficial effects: 1. Thermoelectric waste heat recovery and energy storage collaborative system: the radiation plate (copper plate + black chrome coating) absorbs the heat of the circuit breaker contact, the thermoelectric sheet (TEC) generates power through temperature difference, and the energy is recovered by combining with the battery energy storage, so that the energy is used in a closed loop.

[0019] 2. Two-stage liquid cooling + PCM composite temperature control architecture: the cooling module operates in two stages (top liquid cooling direct cooling + side liquid cooling solidification of PCM heat storage), and the paraffin graphene phase change material is combined to realize dynamic thermal management.

[0020] 3. The mounting rack plate is quickly disassembled through magnetic sealing of the slide rail, the circuit breaker assembly can be completely pulled out during maintenance, and the cumbersome operation of traditional bolt fixing is avoided.

[0021] 4. Cold and hot partition and multi-layer heat dissipation coupling, the chamber isolation plate divides the cold and hot zones, the cold surface of the thermoelectric sheet is placed in the heat dissipation cavity, and the heat dissipation holes and the heat dissipation surface of the refrigerator form forced convection.

[0022] The application can recycle waste heat through thermoelectric recovery, save energy, use new materials (graphene / PCM composite material) for phase change heat storage, recycle waste heat, and realize efficient heat dissipation through modular structure and other innovations. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a front view structural schematic diagram of the application; Figure 2 It is a bottom view structural schematic diagram of the application; Figure 3 It is the rear view structure schematic diagram of switch cabinet body of the application; Figure 4 It is the structure schematic diagram of cooling module, PCM heat energy storage mechanism, chamber isolation plate, mounting rack plate, circuit breaker assembly and its related parts of the application; Figure 5 It is the structure schematic diagram of the application Figure 4 The bottom view structure schematic diagram of the application; Figure 6 It is the structure schematic diagram of cooling module, chamber isolation plate, mounting rack plate, radiation plate, thermoelectric sheet and its related parts of the application; Figure 7 It is the bottom view structure schematic diagram of the application of figure 6; Figure 8 It is the structure schematic diagram of cooling module and its related parts of the application; Figure 9 It is the bottom view structure schematic diagram of cooling module and its related parts of the application; Figure 10 It is the structure schematic diagram of PCM heat energy storage mechanism of the application; Figure 11 It is the structure schematic diagram of mounting rack plate, circuit breaker assembly, chamber isolation plate and its related parts of the application; Figure 12 It is the rear view structure schematic diagram of mounting rack plate, circuit breaker assembly, chamber isolation plate and its related parts of the application; Figure 13 It is the structure schematic diagram of slide rail of the application; Figure 14 It is the structure schematic diagram of heat storage box, side cooling pipe of the application; Figure 15 It is the structure schematic diagram of waterproof shell of the application.

[0024] Wherein: 1, switch cabinet body; 11, cabinet door; 12, transparent plate; 13, heat dissipation hole; 14, waterproof shell; 2, control box; 21, controller; 22, temperature sensor; 3, circuit breaker assembly; 4, cooling module; 41, cooling liquid storage box; 42, mounting rod; 43, supplement port; 44, refrigerator; 45, liquid pump; 46, cross pipe; 47, top cooling pipe; 471, first flow electromagnetic valve; 48, liquid supply pipe; 481, second flow electromagnetic valve; 5, PCM heat energy storage mechanism; 51, heat storage box; 52, sealing cover; 53, side cooling pipe; 54, honeycomb plate; 55, PCM layer; 6, chamber isolation plate; 61, heat dissipation rectangular hole; 62, sealing groove; 7. Slide rail; 71. Limiting rod; 72. Slider; 8. Mounting plate; 81. Side connecting hole; 82. Handle hole; 83. Magnetic sealing strip; 9. Radiation plate; 91. Thermoelectric element. Detailed Implementation

[0025] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified. Example 1

[0026] like Figures 1-14 As shown, this invention provides a power cabinet with liquid-cooled waste heat recovery and heat dissipation function, including a switch cabinet body 1, a control box 2, a cooling module 4, two PCM thermal energy storage mechanisms 5, and two slide rails 7. A cabinet door 11 is rotatably mounted on the front of the switch cabinet body 1 via hinges, and a transparent panel 12 is provided on the cabinet door 11. Heat dissipation holes 13 are provided on the rear side of the switch cabinet body 1. The cooling module 4 is located on the top inner wall of the switch cabinet body 1. The two PCM thermal energy storage mechanisms 5 are located on the inner walls of both sides of the switch cabinet body 1 and are adapted to the cooling module 4. Both slide rails 7 are installed on the side walls of the switch cabinet body 1. Slider 72 is slidably installed inside rail 7. Limit rod 71 is fixedly installed on the inner side of rail 7. Slider 72 is slidably connected to the inner wall of rail 7. The same mounting plate 8 is installed between two sliders 72. Multiple circuit breaker assemblies 3 are arranged on the inner side of mounting plate 8. Three radiating plates 9 are embedded in mounting plate 8. The three radiating plates 9 are close to the contact positions of multiple circuit breaker assemblies 3. Multiple thermoelectric elements 91 are glued to the back of the three radiating plates 9 with thermally conductive adhesive. The multiple thermoelectric elements 91 are connected in series. Control box 2 is set on the bottom inner wall of switch cabinet 1 and is connected in cooperation with multiple thermoelectric elements 91.

[0027] like Figure 1 As shown, in this embodiment, the control box 2 is equipped with a battery and a control chip (STM32H743), which are connected to each module through a flexible FPC cable. Multiple thermoelectric elements 91 are connected to the battery, and the control chip is connected to a controller 21 and a temperature sensor 22.

[0028] like Figures 4-9As shown, in this embodiment, the cooling module 4 includes a cooling liquid storage box 41, a plurality of mounting rods 42 are fixedly installed on the top of the cooling liquid storage box 41, the plurality of mounting rods 42 are all fixedly installed on the inner wall of the top of the switch cabinet body 1, the top of the cooling liquid storage box 41 is provided with a supplement port 43 and a liquid pump 45, the outlet of the liquid pump 45 is communicated with a cross pipe 46, one end of the cross pipe 46 is communicated with a top cooling pipe 47, the top cooling pipe 47 is coiled at the bottom of the cooling liquid storage box 41 and the other end is communicated with the top side of the cooling liquid storage box 41, the top cooling pipe 47 is provided with a first flow electromagnetic valve 471, two refrigerators 44 are embedded in the inner side of the cooling liquid storage box 41, the refrigeration surfaces of the two refrigerators 44 are all located on the inner side of the cooling liquid storage box 41, the other two ends of the cross pipe 46 are communicated with two liquid supply pipes 48, and the two liquid supply pipes 48 are all provided with second flow electromagnetic valves 481.

[0029] As shown in Figures 4-7 , Figure 10 , Figure 14 As shown, in this embodiment, the two PCM thermal energy storage mechanisms 5 include two heat storage boxes 51, the two heat storage boxes 51 are all fixedly installed on the inner walls of the two sides of the switch cabinet body 1, the inner walls of the two heat storage boxes 51 are all coiled with side cooling pipes 53, one end of the two side cooling pipes 53 is communicated with the two second flow electromagnetic valves 481, the other end of the two side cooling pipes 53 is all communicated with the top side of the cooling liquid storage box 41, the outer side of the two heat storage boxes 51 is all fixedly installed with sealing covers 52, the inner side of the two heat storage boxes 51 is all provided with PCM layers 55, the two sealing covers 52 are all provided with honeycomb plates 54, the PCM layer 55 is a paraffin graphene composite phase change material, and the inner side of the PCM layer 55 is embedded in the side cooling pipe 53.

[0030] Specifically, the inner walls of the top cooling pipe 47 and the side cooling pipe 53 are all sprayed with a graphene nanometer coating with a thickness of 50 μm, so that the flow resistance is reduced.

[0031] More specifically, the PCM layer 55 is paraffin (phase change temperature 45-55℃) + 5% graphene composite, the heat storage density is >200 kJ / kg, and the thermal conductivity is improved to 2.5 W / (m·K).

[0032] Cooling liquid flow: liquid pump flow 10 L / min, first-stage liquid cooling (top cooling pipe) pressure drop <5 kPa, and second-stage liquid cooling (side cooling pipe) pressure drop <8 kPa.

[0033] Graphene nanometer coating: 50 μm thickness reduces pipe wall friction resistance by 25% and improves flow efficiency by 18%.

[0034] Operation effect: During the daytime high load, the thermoelectric power generation drives the liquid cooling pump to dissipate heat, and the PCM stores the excess heat. At night, the PCM releases heat to maintain the temperature in the cabinet above 0℃, avoiding freezing damage to the components.

[0035] As shown in Figure 11 , Figure 12 , in the embodiment, the inner side of the switch cabinet body 1 is fixedly installed with a chamber isolation plate 6, the chamber isolation plate 6 and the inner side of the switch cabinet body 1 form a heat dissipation cavity, a plurality of heat dissipation holes 13 are in communication with the heat dissipation cavity, and the heat dissipation surfaces of the two refrigerators 44 all extend to the positions of the heat dissipation cavity through the chamber isolation plate 6.

[0036] Specifically, the heat dissipation holes 13 are used for ventilating and dissipating heat for the heat dissipation cavity and are used for cooling the heat dissipation surfaces of the refrigerators 44.

[0037] As shown in Figure 11 , Figure 12 , in the embodiment, the chamber isolation plate 6 is provided with a heat dissipation rectangular hole 61, the outer side of the chamber isolation plate 6 is provided with a sealing groove 62, the inner side of the mounting rack plate 8 is fixedly installed with a magnetic sealing strip 83, the magnetic sealing strip 83 and the sealing groove 62 are mutually attracted and sealingly connected, a plurality of side communication holes 81 are formed in the two sides of the mounting rack plate 8, and handle holes 82 are formed in the two sides of the mounting rack plate 8.

[0038] Specifically, the sliding rail system: the gap between the sliding block and the sliding rail is 0.1 mm, the pulling resistance is less than 50 N, the magnetic sealing strip adsorption force is greater than 200 N, and the sealing level is IP54.

[0039] Maintenance time: disassembly time is less than 3 minutes (more than 15 minutes is required in the traditional scheme).

[0040] As shown in Figures 6-7 , in the embodiment, the radiation plate 9 is composed of a 5mm copper plate and a 1mm black chrome coating, and the thermoelectric sheet 91 is attached to the back surface of the radiation plate 9 to absorb the heat in the cabinet through heat radiation and heat conduction.

[0041] Specifically, the thermoelectric sheet material is BiTe3-based thermoelectric material, the conversion efficiency is about 5-8% (ΔT=50℃), and the output voltage after series connection can reach 12-24V.

[0042] Black chrome coating: emissivity > 0.9, heat absorption efficiency increased by more than 30%.

[0043] Battery capacity: typically configured as a 48V / 20Ah lithium battery pack, which can store 1kWh of electrical energy and support liquid pump, controller and other load power supply.

[0044] Technical parameters of the experiment of the application: In this embodiment, the working mode: when in use, the temperature inside the switch cabinet body 1 is monitored by the temperature sensor 22, the circuit breaker assembly 3 is in contact with the live part, and the heat is high, the heat is conducted through the radiation plate 9, and is conducted to the thermoelectric sheet 91, which generates electricity using the temperature difference, and the electricity is transmitted to the battery, realizing the purpose of recycling heat energy, the battery is powered, saving electricity, the internal temperature of the switch cabinet body 1 is too high, the heat storage box 51 inside the inner wall of the switch cabinet body 1 is provided with a PCM layer 55, which can absorb and liquefy heat, on the one hand, heat energy is stored, on the other hand, the heat inside the switch cabinet body 1 is balanced and reduced, two refrigerators 44 are used to refrigerate the refrigerant inside the cooling liquid storage box 41, the liquid pump 45 works to send the refrigerant into the cross pipe 46, and then liquid cooling is carried out: the first stage of liquid cooling mode, the first flow electromagnetic valve 471 is opened, the refrigerant enters the top cooling pipe 47 and circulates back to the cooling liquid storage box 41, since the top cooling pipe 47 is fixed on the bottom surface of the cooling liquid storage box 41, according to the principle of cold air sinking, the inside of the switch cabinet body 1 is cooled and cooled; the second stage of liquid cooling mode, two second flow electromagnetic valves 481 are opened, the refrigerant enters the liquid supply pipe 48 and flows into two side cooling pipes 53, and circulates, the two side cooling pipes 53 cool the two PCM layers 55, so that they continue to absorb heat and cool and solidify, which can cool the two sides of the switch cabinet body 1, improve the heat dissipation effect inside the switch cabinet body 1, and release the heat energy stored in the two PCM layers 55 to balance the temperature inside the switch cabinet body 1, the circuit breaker assembly 3 has a quick release maintenance mode, the mounting plate 8 is moved by pulling the two handle holes 82, the mounting plate 8 slides in the two slide rails 7 through the two sliding blocks 72, the magnetic sealing strip 83 is separated from the sealing groove 62, the mounting plate 8 is separated from the chamber isolation plate 6, the mounting plate 8 drives the multiple circuit breaker assemblies 3 to move to the opening position of the switch cabinet body 1, facilitating the maintenance of the circuit breaker assembly 3, the handle hole 82 is pushed, so that the mounting plate 8 contacts the chamber isolation plate 6, the magnetic sealing strip 83 enters the sealing groove 62 to attract and seal the mounting plate 8 and the chamber isolation plate 6, the cold surface of the multiple thermoelectric sheets 91 is located in the heat dissipation cavity through the heat dissipation rectangular hole 61, so that the cold surface is in a low temperature environment of the switch cabinet body 1, improving the temperature difference power generation effect, and the multiple circuit breaker assemblies 3 on the mounting plate 8 adopt a drawer push-pull installation mode, which is quick and convenient. Embodiment two

[0045] The embodiment is further optimized on the basis of the embodiment one, and the same parts as the foregoing technical solutions will not be described herein again, and further, in order to better realize the application, the following setting mode is particularly adopted: in the embodiment, the paraffin graphene composite phase change material adds nano silicon dioxide to enhance the structural stability, the cycle life can be prolonged to 5000 times, a PCM state monitoring sensor is additionally arranged, and the liquid cooling flow is dynamically adjusted to slow down aging.

[0046] As Figure 15 In the embodiment, the outer side of the heat dissipation hole 13 is provided with a waterproof shell 14, the bottom of the waterproof shell 14 is open, and dust and water are prevented without affecting the heat dissipation of the heat dissipation hole 13.

[0047] Although the embodiments of the present application have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A power cabinet with liquid-cooled waste heat recovery and heat dissipation function, characterized in that: include: Switch cabinet (1), the front of switch cabinet (1) is fitted with a cabinet door (11) by hinges. The cooling module (4) is installed on the top inner wall of the switch cabinet (1); Two PCM thermal energy storage mechanisms (5) are installed on the inner walls of both sides of the switch cabinet (1) and are adapted to the cooling module (4); Two slide rails (7) are installed on the side wall of the switch cabinet (1). Slider (72) is slidably installed in both slide rails (7). The same mounting plate (8) is installed between the two sliders (72). Multiple circuit breaker assemblies (3) are arranged on the inner side of the mounting plate (8). Three radiation plates (9) are embedded in the mounting plate (8). The three radiation plates (9) are close to the contact positions of the multiple circuit breaker assemblies (3). Multiple thermoelectric elements (91) are glued to the back of the three radiation plates (9) with thermally conductive adhesive. The multiple thermoelectric elements (91) are connected in series. The control box (2) is located on the bottom inner wall of the switch cabinet (1) and is connected to multiple thermoelectric elements (91).

2. The power cabinet with liquid-cooled waste heat recovery and heat dissipation function according to claim 1, characterized in that: The control box (2) is equipped with a battery and a control chip. Multiple thermoelectric elements (91) are connected to the battery. The radiation plate (9) is made of a 5mm copper plate and a 1mm black chrome coating. The control chip is connected to a controller (21) and a temperature sensor (22). A transparent plate (12) is provided on the cabinet door (11). A heat dissipation hole (13) is provided on the rear side of the switch cabinet (1).

3. A power cabinet with liquid-cooled waste heat recovery and heat dissipation function according to claim 1, characterized in that: The cooling module (4) includes a coolant storage box (41). Multiple mounting rods (42) are fixedly installed on the top of the coolant storage box (41). The multiple mounting rods (42) are all fixedly installed on the top inner wall of the switch cabinet (1). A replenishment port (43) and a liquid pump (45) are provided on the top of the coolant storage box (41). The outlet of the liquid pump (45) is connected to a cross tube (46). One end of the cross tube (46) is connected to a top cooling pipe (47). The top cooling pipe (47) is coiled around the bottom of the coolant storage box (41) and the other end is connected to the top side of the coolant storage box (41). A first flow solenoid valve (471) is provided on the top cooling pipe (47). Two coolers (44) are embedded in the inner side of the coolant storage box (41). The cooling surfaces of the two coolers (44) are located inside the coolant storage box (41).

4. A power cabinet with liquid-cooled waste heat recovery and heat dissipation function according to claim 3, characterized in that: The other two ends of the cross tube (46) are connected to two liquid supply pipes (48), and each of the two liquid supply pipes (48) is equipped with a second flow solenoid valve (481).

5. A power cabinet with liquid-cooled waste heat recovery and heat dissipation function according to claim 4, characterized in that: The two PCM thermal energy storage mechanisms (5) include two heat storage boxes (51). Both heat storage boxes (51) are fixedly installed on the inner walls of both sides of the switch cabinet (1). The inner walls of both heat storage boxes (51) are wound with side cooling pipes (53). One end of the two side cooling pipes (53) is connected to two second flow solenoid valves (481). The other end of the two side cooling pipes (53) is connected to the top side of the coolant storage box (41). The outer side of both heat storage boxes (51) is fixedly installed with sealing caps (52). The inner side of both heat storage boxes (51) is provided with a PCM layer (55). The two sealing caps (52) are provided with honeycomb panels (54).

6. A power cabinet with liquid-cooled waste heat recovery and heat dissipation function according to claim 5, characterized in that: The PCM layer (55) is a paraffin graphene composite phase change material, and the side cooling pipe (53) is embedded inside the PCM layer (55).

7. A power cabinet with liquid-cooled waste heat recovery and heat dissipation function according to claim 3, characterized in that: A chamber isolation plate (6) is fixedly installed on the inner side of the switch cabinet (1). The chamber isolation plate (6) and the inner side of the switch cabinet (1) form a heat dissipation cavity. Multiple heat dissipation holes (13) are connected to the heat dissipation cavity. The heat dissipation surfaces of the two coolers (44) penetrate the chamber isolation plate (6) and extend to the position of the heat dissipation cavity.

8. A power cabinet with liquid-cooled waste heat recovery and heat dissipation function according to claim 7, characterized in that: The chamber isolation plate (6) has a heat dissipation rectangular hole (61), and a sealing groove (62) is provided on the outer side of the chamber isolation plate (6). A magnetic sealing strip (83) is fixedly installed on the inner side of the mounting bracket plate (8). The magnetic sealing strip (83) and the sealing groove (62) attract each other and are sealed together.

9. A power cabinet with liquid-cooled waste heat recovery and heat dissipation function according to claim 1, characterized in that: The mounting plate (8) has multiple side connecting holes (81) on both sides and handle holes (82) on both sides.

10. A power cabinet with liquid-cooled waste heat recovery and heat dissipation function according to claim 1, characterized in that: A limit rod (71) is fixedly installed on the inner side of the slide rail (7), and the slider (72) is slidably connected to the inner wall of the slide rail (7) through the slider (72).

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