An electric power cabinet with liquid cooling waste heat recovery heat dissipation function

Abstract

The application discloses a power cabinet with liquid cooling waste heat recovery and heat dissipation functions, which comprises 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 heat 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 provided with sliding blocks which are slidably arranged in the two sliding rails; the same mounting rack plate is arranged between the two sliding blocks; a plurality of circuit breaker assemblies are arranged on the inner side of the mounting rack plate; three radiation plates are inlaid on the mounting rack plate and are close to the live wire positions of the plurality of circuit breaker assemblies. The device can recycle waste heat through heat recovery, save energy, adopt a new material (graphene / PCM composite material) for phase change heat storage, repeatedly use waste heat, and realize efficient heat dissipation through modular structure and other innovations.

Description

Technical Field

[0001] This invention relates to the field of power switch control technology, and in particular to a power cabinet with liquid cooling waste heat recovery and heat dissipation function. Background Technology

[0002] A power switchgear, also known as a power supply or distribution switchgear, is a type of switching equipment used for power supply or distribution. It is widely used in power plants, petroleum, chemical, metallurgical, textile, and high-rise building industries for power transmission, distribution, and energy conversion. Power switchgear contains circuit breakers and other devices for controlling the on / off state of primary circuits.

[0003] Publication No. CN109599780B discloses a medium-high voltage switchgear, comprising a cable compartment, a busbar compartment, a circuit breaker compartment, and a control compartment. The circuit breaker compartment houses the circuit breaker, incoming contact box, and outgoing contact box. The circuit breaker has a built-in opening and closing mechanism, which consists of an axially fixed retainer, an electromagnetic actuator, an insulating cylinder, and a vacuum bulb. The piston of the retainer is provided with a damping orifice and a connected drainage device and a flow-blocking device. The drainage device is triggered during closing to eliminate the promoting force of the circuit breaker moving contact's closing bounce. The flow-blocking device ensures that the damping medium flowing through the drainage device can only flow into the rodless cavity, allowing the retainer to absorb the energy of the moving contact's reverse bounce. The retainer absorbs part of the energy when the circuit breaker's moving contact closes, eliminates the promoting force of closing bounce, and absorbs the energy of the moving contact's bounce, thereby suppressing the circuit breaker's moving contact from closing bounce and preventing closing bounce arcing.

[0004] Existing technologies have low waste heat recovery efficiency: traditional liquid cooling only transfers heat and does not achieve direct heat-to-electricity conversion, resulting in insufficient energy utilization. It also has a passive heat dissipation response: relying on external cold sources or fixed heat dissipation paths, resulting in poor heat dissipation. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a power cabinet with liquid cooling waste heat recovery and heat dissipation function. The existing technology has low waste heat recovery efficiency: traditional liquid cooling only transfers heat and does not realize direct heat-to-electricity conversion, resulting in insufficient energy utilization. The heat dissipation is passive: it relies on external cold sources or fixed heat dissipation paths, resulting in poor heat dissipation effect.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A power cabinet with liquid-cooled waste heat recovery and heat dissipation function includes:

[0008] The switch cabinet has a door mounted on the front via a hinge, with a transparent panel on the door, and ventilation holes on the rear side.

[0009] The cooling module is installed on the top inner wall of the switch cabinet;

[0010] Two PCM thermal energy storage mechanisms are installed on the inner walls of both sides of the switch cabinet and are compatible with the cooling module;

[0011] Two slide rails, each with a slider slidably mounted inside. A common mounting plate is installed between the two sliders. Multiple circuit breaker assemblies are arranged on the inner side of the mounting plate. Three radiating plates are embedded in the mounting plate, close to the contact points of the multiple circuit breaker assemblies. Multiple thermoelectric elements are attached to the back of each of the three radiating plates with thermally conductive adhesive. The multiple thermoelectric elements are connected in series. The thermoelectric elements are BiTe3-based flexible thermoelectric elements (single size 50mm×50mm×2mm) and the surface is covered with an aluminum nitride insulation layer.

[0012] The control box is located on the bottom inner wall of the switch cabinet and is connected in conjunction with multiple thermoelectric elements.

[0013] Preferably, the control box contains a battery and a control chip (STMH), which are connected to each module via flexible FPC cables. Multiple thermoelectric elements are connected to the battery, and the control chip is connected to a controller and a temperature sensor.

[0014] Preferably, the cooling module includes a coolant storage box, with multiple mounting rods fixedly installed on the top of the coolant storage box. The mounting rods are all fixedly installed on the top inner wall of the switch cabinet. The top of the coolant storage box is provided with a replenishment port and a liquid pump. The outlet of the liquid pump is connected to a cross tube. One end of the cross tube is connected to a top cooling pipe. The top cooling pipe is coiled around the bottom of the coolant storage box and its other end is connected to the top side of the coolant storage box. A first flow solenoid valve is provided on the top cooling pipe. Two coolers are embedded inside the coolant storage box, and the cooling surfaces of the two coolers are located inside the coolant storage box.

[0015] Preferably, the other two ends of the cross tube are connected to two liquid supply pipes, and each of the two liquid supply pipes is equipped with a second flow solenoid valve.

[0016] Preferably, the two PCM thermal energy storage mechanisms include two heat storage boxes, both of which are fixedly installed on the inner walls of both sides of the switch cabinet. Side cooling pipes are wound in a curved shape on the inner walls of both heat storage boxes. One end of each side cooling pipe is connected to two second flow solenoid valves, and the other end of each side cooling pipe is connected to the top side of the coolant storage box. A sealing cover is fixedly installed on the outer side of each heat storage box. A PCM layer is provided on the inner side of each heat storage box, and a honeycomb plate is provided on each of the two sealing covers.

[0017] Preferably, the PCM layer is a paraffin-graphene composite phase change material, and the side cooling pipe is embedded inside the PCM layer.

[0018] Preferably, the inner walls of both the top cooling pipe and the side cooling pipe are coated with a graphene nano-coating with a thickness of 50 μm to reduce flow resistance.

[0019] Preferably, a chamber isolation plate is fixedly installed on the inner side of the switch cabinet, and the chamber isolation plate and the inner side of the switch cabinet form a heat dissipation cavity. Multiple heat dissipation holes are connected to the heat dissipation cavity, and the heat dissipation surfaces of the two coolers penetrate the chamber isolation plate and extend to the position of the heat dissipation cavity.

[0020] Preferably, the chamber isolation plate has a rectangular heat dissipation hole, the outer side of the chamber isolation plate has a sealing groove, and a magnetic sealing strip is fixedly installed on the inner side of the mounting bracket plate. The magnetic sealing strip and the sealing groove attract each other and form a sealed connection.

[0021] Preferably, the mounting plate has multiple side connecting holes on both sides and handle holes on both sides.

[0022] Preferably, a limit rod is fixedly installed on the inner side of the slide rail, and the slider is slidably connected to the inner wall of the slide rail.

[0023] Preferably, the radiant plate is made of a 5mm copper plate and a 1mm black chrome coating, and the thermoelectric element is attached to the back of the radiant plate to absorb heat inside the cabinet through thermal radiation and thermal conduction.

[0024] Compared with the prior art, the beneficial effects that this invention can achieve are:

[0025] 1. Coordinated system for waste heat recovery and energy storage of thermoelectric power: The system absorbs heat from the circuit breaker contacts through a radiant plate (copper plate + black chrome coating), generates electricity using the temperature difference of the thermoelectric element (TEC), and combines it with battery energy storage to achieve energy recovery and realize closed-loop energy utilization.

[0026] 2. Dual-stage liquid cooling + PCM composite temperature control architecture: The cooling module operates in two stages (top liquid cooling for direct cooling + side liquid cooling and solidified PCM for heat storage), combined with paraffin graphene phase change materials to achieve dynamic thermal management.

[0027] 3. The mounting bracket is quick-released via a magnetic seal on the slide rail. During maintenance, the circuit breaker assembly can be pulled out as a whole, avoiding the cumbersome operation of traditional bolt fixing.

[0028] 4. Hot and cold zones are coupled with multi-layer heat dissipation. The chamber isolation plate divides the hot and cold zones, and the cold side of the thermoelectric element is placed in the heat dissipation cavity. Combined with the heat dissipation holes and the heat dissipation surface of the cooler, forced convection is formed.

[0029] This invention enables the recovery and utilization of waste heat through thermoelectric recovery, saving energy. It also achieves efficient heat dissipation through the use of new materials (graphene / PCM composite material) for phase change heat storage, waste heat absorption and reuse, and modular structure. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0031] Figure 2 This is a bottom-view structural diagram of the present invention;

[0032] Figure 3 This is a rear view structural diagram of the switch cabinet of the present invention;

[0033] Figure 4 This is a structural schematic diagram of the cooling module, PCM thermal energy storage mechanism, chamber isolation plate, mounting bracket plate, circuit breaker assembly and related parts of the present invention.

[0034] Figure 5 For the present invention Figure 4 A schematic diagram of the structure viewed from below;

[0035] Figure 6 This is a schematic diagram of the structure of the cooling module, chamber isolation plate, mounting bracket plate, radiant plate, thermoelectric element and related parts of the present invention;

[0036] Figure 7 This is a bottom view of the structure shown in Figure 6 of the present invention;

[0037] Figure 8 This is a structural schematic diagram of the cooling module and related parts of the present invention;

[0038] Figure 9 This is a bottom view of the cooling module and related components of the present invention.

[0039] Figure 10 This is a schematic diagram of the PCM thermal energy storage mechanism of the present invention;

[0040] Figure 11 This is a structural schematic diagram of the mounting plate, circuit breaker assembly, chamber isolation plate and related parts of the present invention.

[0041] Figure 12 This is a rear view schematic diagram of the mounting bracket, circuit breaker assembly, chamber isolation plate and related parts of the present invention;

[0042] Figure 13 This is a schematic diagram of the slide rail structure of the present invention;

[0043] Figure 14 This is a schematic diagram of the structure of the heat storage box and the side cooling pipe of the present invention;

[0044] Figure 15 This is a schematic diagram of the waterproof shell of the present invention.

[0045] The components include: 1. Switch cabinet body; 11. Cabinet door; 12. Transparent panel; 13. Ventilation holes; 14. Waterproof shell;

[0046] 2. Control box; 21. Controller; 22. Temperature sensor; 3. Circuit breaker assembly;

[0047] 4. Cooling module; 41. Coolant storage box; 42. Mounting rod; 43. Refill port; 44. Refrigerator; 45. Liquid pump; 46. Cross tube; 47. Top cooling pipe; 471. First flow solenoid valve; 48. Liquid supply pipe; 481. Second flow solenoid valve;

[0048] 5. PCM thermal energy storage mechanism; 51. Thermal storage box; 52. Sealing cover; 53. Side cooling pipe; 54. Honeycomb panel; 55. PCM layer;

[0049] 6. Chamber partition plate; 61. Rectangular heat dissipation hole; 62. Sealing groove;

[0050] 7. Slide rail; 71. Limiting rod; 72. Slider;

[0051] 8. Mounting plate; 81. Side connecting hole; 82. Handle hole; 83. Magnetic sealing strip;

[0052] 9. Radiation plate; 91. Thermoelectric element. Detailed Implementation

[0053] 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

[0054] like Figures 1-14As 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.

[0055] 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.

[0056] like Figures 4-9 As shown, in this embodiment, 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. The top of the coolant storage box 41 is provided with a replenishment port 43 and a liquid pump 45. 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. The other two ends of the cross tube 46 are connected to two liquid supply pipes 48. A second flow solenoid valve 481 is provided on each of the two liquid supply pipes 48.

[0057] like Figures 4-7 , Figure 10 , Figure 14As shown, in this embodiment, 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. Side cooling pipes 53 are wound in a curved shape on the inner walls of both heat storage boxes 51. One end of each side cooling pipe 53 is connected to two second flow solenoid valves 481, and the other end of each side cooling pipe 53 is connected to the top side of the coolant storage box 41. A sealing cover 52 is fixedly installed on the outer side of each heat storage box 51. A PCM layer 55 is provided on the inner side of each heat storage box 51. A honeycomb plate 54 is provided on each of the two sealing covers 52. The PCM layer 55 is a paraffin graphene composite phase change material, and the side cooling pipes 53 are embedded inside the PCM layer 55.

[0058] Specifically, the inner walls of the top cooling pipe 47 and the side cooling pipe 53 are coated with a graphene nano-coating with a thickness of 50μm to reduce flow resistance.

[0059] More specifically, PCM layer 55 is a composite of paraffin (phase change temperature 45-55℃) and 5% graphene, with a heat storage density >200kJ / kg and a thermal conductivity increased to 2.5W / (m·K).

[0060] Coolant flow rate: Pump flow rate 10L / min, pressure drop of primary liquid cooling (top cooling pipe) <5kPa, pressure drop of secondary liquid cooling (side cooling pipe) <8kPa.

[0061] Graphene nanocoating: 50μm thickness reduces pipe wall friction resistance by 25% and improves flow efficiency by 18%.

[0062] Running result:

[0063] During the daytime high load period, the thermal power generation drives the liquid cooling pump to dissipate heat, while the PCM stores excess heat.

[0064] At night when temperatures are low, the PCM releases heat to maintain the cabinet temperature above 0°C, preventing components from freezing and being damaged.

[0065] like Figure 11 , Figure 12 As shown, in this embodiment, 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.

[0066] Specifically, the heat dissipation holes 13 are used to ventilate and dissipate heat in the heat dissipation cavity and to cool the heat dissipation surface of the cooler 44.

[0067] like Figure 11 , Figure 12As shown, in this embodiment, the chamber isolation plate 6 has a heat dissipation rectangular hole 61, the outer side of the chamber isolation plate 6 has a sealing groove 62, and the inner side of the mounting bracket plate 8 is fixedly installed with a magnetic sealing strip 83. The magnetic sealing strip 83 and the sealing groove 62 attract each other and are sealed together. Both sides of the mounting bracket plate 8 have multiple side connecting holes 81, and both sides of the mounting bracket plate 8 have handle holes 82.

[0068] Specifically, the slide rail system has the following characteristics: a slider-rail gap of 0.1mm, a pulling resistance of <50N, a magnetic sealing strip adsorption force of >200N, and a sealing rating of IP54.

[0069] Maintenance time: Disassembly time < 3 minutes (traditional solutions require more than 15 minutes).

[0070] like Figures 6-7 As shown, in this embodiment, the radiant plate 9 is composed of a 5mm copper plate and a 1mm black chrome coating. The thermoelectric element 91 is attached to the back of the radiant plate 9 and absorbs heat inside the cabinet through thermal radiation and thermal conduction.

[0071] Specifically, the thermoelectric material is BiTe3-based thermoelectric material with a conversion efficiency of about 5-8% (when ΔT=50℃), and the output voltage can reach 12-24V after being connected in series.

[0072] Black chrome coating: emissivity > 0.9, improving heat absorption efficiency by more than 30%.

[0073] Battery capacity: The typical configuration is a 48V / 20Ah lithium battery pack, which can store 1kWh of electrical energy and support power supply for loads such as liquid pumps and controllers.

[0074] Experimental technical parameters of this invention: In this embodiment, the working method is as follows: During use, the internal temperature of the switch cabinet 1 is monitored by the temperature sensor 22. The circuit breaker assembly 3 has high heat at the power-on contact point. The heat is conducted through the radiant plate 9 to the thermoelectric element 91. The thermoelectric element 91 generates electricity using the temperature difference, and the generated electricity is transferred to the battery, achieving the purpose of heat energy recovery and utilization. The battery provides power, saving energy. If the internal temperature of the switch cabinet 1 is too high, the heat storage boxes 51 on both sides of the inner wall of the switch cabinet 1 are equipped with PCM layers 55. The PCM layers 55 can absorb and liquefy the heat, storing heat energy on one hand and balancing the temperature on the other. To reduce the heat inside the switch cabinet 1, two coolers 44 are used to cool the refrigerant inside the coolant storage box 41. A liquid pump 45 operates to deliver the refrigerant into the cross tube 46, then liquid cooling is performed: In the first stage of liquid cooling, the first flow solenoid valve 471 opens, allowing the refrigerant to enter the top cooling pipe 47 and circulate back to the coolant storage box 41. Since the top cooling pipe 47 is fixed to the bottom of the coolant storage box 41, the interior of the switch cabinet 1 is cooled based on the principle of cold air sinking. In the second stage of liquid cooling, two second flow solenoid valves 481 open, allowing the refrigerant to enter the supply pipe 48... The heat flows into the two side cooling pipes 53 and circulates, cooling the two PCM layers 55 and allowing them to solidify and continue absorbing heat. This cools both sides of the switch cabinet 1, improving the heat dissipation inside the switch cabinet 1. In the high-cooling night mode, the heat stored in the two PCM layers 55 is released, balancing the temperature inside the switch cabinet 1. The circuit breaker assembly 3 has a quick-release maintenance mode. The mounting plate 8 is moved by pulling through the two handle holes 82. The mounting plate 8 slides within the two slide rails 7 via two sliders 72. The mounting plate 8 causes the magnetic sealing strip 83 to leave the sealing groove 62, connecting... The mounting plate 8 is fixed to the chamber isolation plate 6. The mounting plate 8 moves the multiple circuit breaker assembly 3 to the opening position of the switch cabinet 1, which facilitates the maintenance of the circuit breaker assembly 3. Pushing the handle hole 82 makes the mounting plate 8 contact the chamber isolation plate 6. The magnetic sealing strip 83 enters the sealing groove 62 and is attracted to seal the space between the mounting plate 8 and the chamber isolation plate 6. The cold surface of the multiple thermoelectric elements 91 is located in the heat dissipation cavity through the heat dissipation rectangular hole 61, so that the cold surface is in the low temperature environment of the switch cabinet 1, which improves the thermal difference power generation effect. The multiple circuit breaker assemblies 3 on the mounting plate 8 adopt the drawer push-pull installation mode, which is quick and convenient. Example 2

[0075] This embodiment is a further optimization based on Embodiment 1. The parts that are the same as those in the aforementioned technical solutions will not be repeated here. In order to better realize the present invention, the following settings are adopted: In this embodiment, nano-silica is added to the paraffin graphene composite phase change material to enhance the structural stability and extend the cycle life to 5000 times. A PCM condition monitoring sensor is added to dynamically adjust the liquid cooling flow rate to slow down aging.

[0076] like Figure 15 In this embodiment, a waterproof shell 14 is provided on the outside of the heat dissipation hole 13. The bottom of the waterproof shell 14 is open, which can prevent dust and water without affecting the heat dissipation of the heat dissipation hole 13.

[0077] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electric power cabinet with liquid-cooled waste heat recovery heat dissipation function, characterized in that: The utility model relates to a kind of electric cabinet with liquid cooling waste heat recovery and radiation function, including: Switch cabinet body (1), the front of switch cabinet body (1) is rotatably installed with cabinet door (11) by hinge; Cooling module (4) is arranged on the top inner wall of switch cabinet body (1); Two PCM thermal energy storage mechanisms (5) are arranged on the two side inner walls of switch cabinet body (1), and are matched with cooling module (4); Two slide rails (7) are installed on the side wall of switch cabinet body (1), two slide blocks (72) are slidably installed in two slide rails (7), and the same mounting rack plate (8) is installed between two slide blocks (72), the inner side of mounting rack plate (8) is provided with multiple circuit breaker assemblies (3), three radiation plates (9) are embedded on mounting rack plate (8), three radiation plates (9) are close to the live position of multiple circuit breaker assemblies (3), the back of three radiation plates (9) is pasted with multiple thermoelectric pieces (91) by heat-conducting adhesive, and multiple thermoelectric pieces (91) are connected in series; Control box (2) is arranged on the bottom inner wall of switch cabinet body (1) and is connected with multiple thermoelectric pieces (91); 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 fixedly installed on the top inner wall of the switch cabinet body (1), a replenishment opening (43) and a liquid pump (45) are provided on the top of the cooling liquid storage box (41), 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 is communicated with the top side of the cooling liquid storage box (41) at the other end, a first flow electromagnetic valve (471) is provided on the top cooling pipe (47), two refrigerators (44) are embedded in the inner side of the cooling liquid storage box (41), and the refrigeration surfaces of the two refrigerators (44) are 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 second flow electromagnetic valve (481) is provided on the two liquid supply pipes (48); The two PCM thermal energy storage mechanisms (5) include two heat storage boxes (51), the two heat storage boxes (51) are fixedly installed on the two side inner walls of the switch cabinet body (1), the inner walls of the two heat storage boxes (51) are 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 communicated with the top side of the cooling liquid storage box (41), the outer sides of the two heat storage boxes (51) are fixedly installed with sealing covers (52), the inner sides of the two heat storage boxes (51) are provided with PCM layers (55), the two sealing covers (52) are 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).

2. The electric cabinet with liquid cooling waste heat recovery and radiation function according to claim 1, characterized in that: The inside of the control box (2) is provided with a battery, a control chip, a plurality of thermoelectric sheets (91) connected with the battery, a radiation plate (9) composed of a 5mm copper plate and a 1mm black chromium coating, a controller (21) and a temperature sensor (22) connected on the control chip, a transparent plate (12) provided on the cabinet door (11), and a heat dissipation hole (13) provided on the rear side of the switch cabinet body (1).

3. The power cabinet with liquid cooling waste heat recovery and heat dissipation functions according to claim 1, characterized in that: The inside of the switch cabinet body (1) is fixedly provided with a chamber isolation plate (6), the chamber isolation plate (6) and the inside of the switch cabinet body (1) form a heat dissipation chamber, a plurality of heat dissipation holes (13) are in communication with the heat dissipation chamber, and the heat dissipation surfaces of the two refrigerators (44) extend to the positions of the heat dissipation chamber through the chamber isolation plate (6).

4. The power cabinet with liquid cooling waste heat recovery and heat dissipation functions according to claim 3, characterized in that: The chamber isolation plate (6) is provided with a heat dissipation rectangular hole (61), the outside of the chamber isolation plate (6) is provided with a sealing groove (62), the inside of the mounting rack plate (8) is fixedly provided with a magnetic sealing strip (83), and the magnetic sealing strip (83) and the sealing groove (62) are mutually attracted and sealingly connected.

5. The power cabinet with liquid cooling waste heat recovery and heat dissipation functions according to claim 1, characterized in that: The two sides of the mounting rack plate (8) are provided with a plurality of side communication holes (81), and the two sides of the mounting rack plate (8) are provided with handle holes (82).

6. The power cabinet with liquid cooling waste heat recovery and heat dissipation functions according to claim 1, characterized in that: The inside of the slide rail (7) is fixedly provided with a limiting rod (71), and the slide block (72) is slidingly connected with the inner wall of the slide rail (7) through the limiting rod (71).

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