Gas tank of gas-insulated switchgear

Abstract

The invention discloses an inflatable cabinet gas tank which comprises a gas tank body, three-phase high-voltage switch assemblies are arranged in the gas tank body, wire inlet sleeves and wire outlet sleeves which are matched with the high-voltage switch assemblies in a one-to-one mode are arranged on the gas tank body, a heat dissipation box is arranged at the upper end of the gas tank body, and a pressure relief device is arranged at the upper end of the heat dissipation box. The interior of the heat dissipation box and the interior of the gas box body are communicated to form a closed cavity, the closed cavity is filled with a gas insulating medium, the outer surfaces of the gas box body and the heat dissipation box are all paved with heat dissipation fins, heat conduction silicone grease is smeared between the heat dissipation fins and the gas box body and between the heat dissipation fins and the heat dissipation box, the heat dissipation fins are smeared with black radiation heat absorption coatings, and the radiance of the radiation heat absorption coatings is higher than 0.9. The heat dissipation area and the heat conduction efficiency of the gas tank can be increased, heat can be rapidly transmitted to the surfaces of the cooling fins to accelerate heat dissipation, the heat radiation heat dissipation effect can be enhanced, the gas tank can emit more heat in unit time, the temperature in the gas tank is effectively reduced, the reliability of the gas tank is improved, and the service life of the gas tank is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of electrical equipment, and more specifically, to an inflatable cabinet gas box. Background Art

[0002] With the continued development of modern industry and the accelerating pace of urbanization, the scale and complexity of power systems are increasing. In medium-voltage distribution networks, 12kV-150A gas-filled switchgear plays a key role in meeting the high-capacity power demands of large industrial users and commercial areas.

[0003] As a core component that houses and protects electrical equipment, the air box's design and heat dissipation performance directly impact the equipment's reliability, safety, and service life. However, the current air box layout hinders heat dissipation within the chamber. The air box body seals the main circuit, completely isolating the interior from the outside, preventing convection and requiring only radiation to dissipate heat.

[0004] Due to electrothermal phenomena, contact resistance increases when components experience poor surface contact, severe oxidation, insufficient contact pressure, or a reduced effective contact area. Furthermore, as current increases, the rate of change in resistance and heat generation are positively correlated. Therefore, the development of airboxes with improved heat dissipation is urgent. Summary of the Invention

[0005] In order to solve the technical problem of poor heat dissipation of existing air boxes, the present invention innovatively provides an inflatable cabinet air box, which can increase the heat dissipation area and heat conduction efficiency of the air box, so that heat can be quickly transferred to the surface of the heat sink to accelerate heat dissipation. It can also enhance the heat radiation heat dissipation effect, allowing the air box to dissipate more heat per unit time, thereby effectively reducing the temperature inside the air box and improving the reliability and service life of the air box.

[0006] To achieve the above-mentioned technical objectives, an embodiment of the present invention discloses an air box for an inflatable cabinet, comprising an air box body, wherein a three-phase high-voltage switch assembly is provided in the air box body, and an inlet bushing and an outlet bushing that match each phase high-voltage switch assembly are provided on the air box body. A heat sink is provided at the upper end of the air box body, and a pressure relief device is provided at the upper end of the heat sink. The heat sink and the air box body are internally connected to form a closed cavity, and the closed cavity is filled with a gas insulating medium. The outer surfaces of the air box body and the heat sink are covered with heat sinks, and thermal conductive silicone grease is applied between the heat sink and the air box body and the heat sink. A black radiation heat-absorbing coating is applied on the heat sink, and the emissivity of the radiation heat-absorbing coating is higher than 0.9.

[0007] Furthermore, the present invention provides an air box for an inflatable cabinet, wherein the air box body includes an air box upper plate, an air box lower plate, an air box left plate, an air box right plate, an air box front plate and an air box rear plate, the air box upper plate, the air box lower plate, the air box left plate, the air box right plate, the air box front plate and the air box rear plate are interconnected to form a box structure, the upper half of the air box rear plate is forwardly approached to the air box front plate through a horizontal plate, the outlet bushing is installed on the air box left plate, the inlet bushing is invertedly installed on the horizontal plate, the air box upper plate is provided with heat dissipation holes, and the heat dissipation box is installed on the air box upper plate and covers the heat dissipation holes.

[0008] Furthermore, the present invention provides an inflatable cabinet gas box, wherein each phase high-voltage switch assembly includes an upper busbar, a branch busbar, a static contact seat, an isolating knife, a knife seat, a circuit breaker pole and a lower busbar, the upper busbar is connected to the outlet bushing, one end of the branch busbar is connected to the upper busbar, and the other end of the branch busbar is connected to the static contact seat, the static contact seat and the knife seat are coaxially arranged, the isolating knife is rod-shaped, the isolating knife and the knife seat are slidingly arranged, the isolating knife and the knife seat are plugged into each other, and the knife seat is fixed at the outlet end of the circuit breaker pole, one end of the lower busbar is connected to the incoming end of the circuit breaker pole, and the other end of the lower busbar is connected to the incoming bushing.

[0009] Furthermore, the present invention provides an air box for an inflatable cabinet, wherein a parallel line sleeve corresponding to the outlet sleeve on the left plate of the air box is provided on the right plate of the air box, and the upper busbar includes three upper busbar rows, and the three upper busbar rows are fixed between the outlet sleeve and the parallel line sleeve at intervals along the front-to-back direction.

[0010] Furthermore, the present invention provides an inflatable cabinet gas box, wherein the branch busbar includes three branch busbar bars arranged in the up and down directions, the three branch busbar bars are arranged with a front-to-back interval between each other, the upper ends of the three branch busbar bars are fixedly connected to the three upper busbar bars in a one-to-one correspondence, and the upper ends of the three branch busbar bars are all fixedly connected to the static contact seat.

[0011] Furthermore, the present invention provides an air box for an inflatable cabinet, wherein the knife seat and the circuit breaker pole are both horizontally fixed on the front plate of the air box in the front-to-back direction, the knife seat is located above the circuit breaker pole, and a fixing frame is fixed on the rear plate of the air box behind the knife seat, the static contact seat is fixed on the fixing frame through an insulator, and a plurality of heat dissipation plates are provided between the insulator and the static contact seat, and the plurality of heat dissipation plates are coaxially arranged at intervals in the front-to-back direction.

[0012] Furthermore, the present invention provides an inflatable cabinet gas box, wherein the lower busbar includes three lower busbar bars arranged along the front-to-back direction, the three lower busbar bars are arranged at intervals in the left-to-right direction, the incoming end of the circuit breaker pole faces the rear plate of the gas box, a conductive block is fixed on the incoming end of the circuit breaker pole, the front ends of the three lower busbar bars are fixedly connected to the conductive blocks, and the rear ends of the three lower busbar bars are fixedly connected to the incoming bushing.

[0013] Furthermore, the present invention provides an air box for an inflatable cabinet, wherein the knife seat, static contact seat and lower busbar are all provided with heat sinks, and thermal grease is applied between the heat sink and the knife seat, static contact seat and lower busbar, and the thermal conductivity coefficient of the thermal grease is not less than 3.

[0014] Furthermore, the present invention provides an air box for an inflatable cabinet, wherein reinforcing ribs are fixed on the inner surfaces of the air box upper plate, the air box lower plate, the air box left plate, the air box right plate, the air box front plate and the air box rear plate.

[0015] Furthermore, the present invention provides an air box for an inflatable cabinet, wherein the pressure relief device includes a flange, a metal diaphragm, a rupture ring and a pressure ring, a pressure relief hole is provided on the heat sink, the flange is fixed to the heat sink by nails, the flange is coaxial with the pressure relief hole, a sealing ring is provided between the flange and the heat sink, the metal diaphragm and the rupture ring are pressed against the flange by the pressure ring, the metal diaphragm is recessed toward the interior of the heat sink, the rupture ring is located above the metal diaphragm, and the inner ring of the rupture ring is provided with a circle of barbs inclined toward the metal diaphragm.

[0016] The present invention differs from the prior art in that it covers the outer surfaces of the airbox body and heat sink with heat sink fins, increasing the heat dissipation area and facilitating rapid heat dissipation. Furthermore, thermally conductive silicone grease is applied between the heat sink, the airbox body, and the heat sink, effectively improving heat conduction efficiency and allowing heat to be transferred more quickly to the heat sink surface. Furthermore, the heat sink is coated with a black radiation-absorbing coating with an emissivity greater than 0.9. According to the Stefan-Boltzmann law, a high-emissivity coating enhances the heat dissipation effect of heat radiation, allowing the airbox to dissipate more heat per unit time, thereby effectively reducing equipment temperature, ensuring stable operation of the three-phase high-voltage switch assembly within a suitable temperature environment, and improving the reliability and service life of the airbox and the equipment within it. By providing a pressure relief device at the top of the heat sink, when the pressure in the sealed cavity increases due to temperature changes or other factors, the pressure relief device can promptly release the pressure, preventing damage to the cavity due to excessive pressure. This protects the three-phase high-voltage switch assembly within the airbox body and prevents safety accidents caused by abnormal pressure. By filling the closed cavity with gas insulation medium, a good insulation environment can be provided for the three-phase high-voltage switch assembly, preventing the occurrence of electrical faults such as phase-to-phase short circuit and ground short circuit, and improving the electrical insulation performance and operation safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of an air box of an inflatable cabinet according to the present invention;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the gas box of the inflatable cabinet of the present invention from another angle;

[0019] Figure 3 For Figure 1 The three-dimensional structural diagram of the air box left plate is hidden on the basis of FIG.

[0020] Figure 4 This is a left-side structural diagram of an air box of an inflatable cabinet according to the present invention (the left plate of the air box is hidden);

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the gas box of an inflatable cabinet of the present invention, with the three-phase high-voltage switch assembly, the heat dissipation box and the left plate of the gas box hidden;

[0022] Figure 6 The present invention is a schematic cross-sectional structural diagram of a pressure relief device in an air box of an inflatable cabinet. DETAILED DESCRIPTION

[0023] The following is a detailed explanation and description of an inflatable cabinet air box of the present invention in conjunction with the drawings in the specification.

[0024] like Figure 1 As shown, an embodiment of the present invention discloses an inflatable cabinet gas box, comprising a gas box body 1, housing a three-phase high-voltage switch assembly 2. The gas box body 1 is provided with an inlet bushing 3 and an outlet bushing 4, each matching the corresponding phase of the high-voltage switch assembly. A heat sink 5 is provided at the upper end of the gas box body 1, which efficiently dissipates heat from the bottom of the gas box body 1 upward. A pressure relief device 6 is also provided at the upper end of the box. This device allows for timely pressure relief when pressure rises within the sealed chamber due to temperature fluctuations or other factors, preventing damage to the chamber due to excessive pressure. This protects the three-phase high-voltage switch assembly 2 within the gas box body 1 and prevents safety accidents caused by abnormal pressure. The heat sink 5 and the gas box body 1 are connected to form a sealed chamber, which is filled with a gaseous insulating medium. Filling the sealed chamber with the gaseous insulating medium provides a good insulation environment for the three-phase high-voltage switch assembly 2, preventing electrical faults such as interphase short circuits and short circuits to ground, and improving the electrical insulation performance and operational safety of the equipment. The outer surfaces of the air box body 1 and the heat sink 5 are covered with heat sinks 7. The heat sink 7 can increase the heat dissipation area and help to quickly dissipate heat. Thermal conductive silicone grease is applied between the heat sink 7 and the air box body 1 and the heat sink 5, which can effectively improve the heat conduction efficiency and transfer heat to the surface of the heat sink 7 more quickly. The heat sink 7 is coated with a black radiation heat absorption coating, and the radiation heat absorption coating has an emissivity higher than 0.9. According to the Stefan-Boltzmann law, the air box acts as a heat source. The high emissivity coating can enhance the heat radiation heat dissipation effect, allowing the air box to dissipate more heat per unit time, thereby effectively reducing the temperature of the equipment, ensuring that the three-phase high-voltage switch assembly 2 operates stably in a suitable temperature environment, and improving the reliability and service life of the air box and the equipment inside the air box.

[0025] In one embodiment of the present invention, the airbox body 1 includes an upper plate 11, a lower plate 12, a left plate 13, a right plate 14, a front plate 15, and a rear plate 16. These plates 11, 12, 13, 14, 15, and 16 are interconnected to form a box structure. These plates are constructed of 3.0 mm thick stainless steel. Reinforcing ribs 9 are fixed to the inner surfaces of these plates, increasing the strength of the airbox body 1 and enabling use even at high altitudes. The upper half of the airbox rear plate 16 is brought forward to the airbox front plate 15 via a horizontal plate 17, thereby reducing the volume of the airbox. The outlet bushing 4 is mounted on the airbox left plate 13, and the inlet bushing 3 is mounted in an inverted position on the horizontal plate 17. When installing the high-voltage busbar, the high-voltage busbar only needs to be vertically inserted into the inverted outlet bushing 4, making rational use of space. The airbox upper plate 11 is provided with heat dissipation holes 111. The heat dissipation box 5 is mounted on the airbox upper plate 11 and covers the heat dissipation holes 111. The heat dissipation holes 111 should be as large as possible when set, so that the heat generated in the airbox body 1 can be quickly dissipated by the heat dissipation box 5.

[0026] In one embodiment of the present invention, each phase high-voltage switch assembly includes an upper busbar 21 , a branch busbar 22 , a static contact seat 23 , an isolating knife 24 , a knife seat 25 , a circuit breaker pole 26 and a lower busbar 27 . The upper busbar 21 is connected to the outlet bushing 4, one end of the branch busbar 22 is connected to the upper busbar 21, and the other end of the branch busbar 22 is connected to the static contact seat 23. The static contact seat 23 is coaxially arranged with the knife seat 25, and the isolating knife 24 is rod-shaped. The isolating knife 24 and the knife seat 25 are slidingly arranged. The isolating knife 24 and the knife seat 25 are plugged into each other. The knife seat 25 and the circuit breaker pole 26 are both horizontally fixed on the air box front plate 15 in the front and back directions. The knife seat 25 is located above the circuit breaker pole 26. A fixing frame 18 is fixed on the air box rear plate 16 behind the knife seat 25. The static contact seat 23 is fixed to the fixing frame 18 through an insulator 28. A plurality of heat dissipation plates 29 are provided between the insulator 28 and the static contact seat 23. The plurality of heat dissipation plates 29 are coaxially arranged at intervals front and back. The heat dissipation plates 29 provided can effectively dissipate the heat generated at the static contact seat 23. The isolating knife 24 is driven by the isolating operating mechanism on the outside of the gas box body 1 to move linearly in the front-to-back direction, thereby realizing the three-position operation of the isolating knife 24. The knife holder 25 is fixed to the outgoing line end of the circuit breaker pole 26, one end of the lower busbar 27 is connected to the incoming line end of the circuit breaker pole 26, and the other end of the lower busbar 27 is connected to the incoming line bushing 3. The isolating knife 24 is installed in a direct-acting manner, and there will be no problems such as poor surface contact of the isolating knife 24, insufficient contact pressure, and small effective contact area. Therefore, the problem of increased heat generation due to increased contact resistance can be effectively avoided. The circuit breaker pole 26 is driven by the circuit breaker operating mechanism on the outside of the gas box body 1 to open and close the vacuum interrupter chamber inside it, thereby completing the connection and disconnection between the circuit breaker pole 26 and the high-voltage incoming line.

[0027] In one embodiment of the present invention, a paralleling bushing 8 is provided on the right plate 14 of the gas box, corresponding one-to-one with the outlet bushing 4 on the left plate 13 of the gas box. The upper busbar 21 includes three upper busbar bars, which are fixed between the outlet bushing 4 and the paralleling bushing 8 at intervals along the front-to-back direction. The outlet bushing 4 and the paralleling bushing 8 can support the upper busbar bar. By providing the outlet bushing 4 and the paralleling bushing 8, connection interfaces for external power transmission can be provided on the left and right sides of the gas box body 1, making cabinet merging or power distribution more convenient. The upper busbar 21 is composed of three upper busbar bars, which can increase the heat dissipation area of the upper busbar 21 and improve the heat dissipation effect.

[0028] The branch busbar 22 includes three branch busbars arranged in the up-down direction. The three branch busbars are spaced apart from each other in front and back. Compared with closely arranging the three branch busbars, the contact area between the branch busbars and the surrounding air is increased. The larger contact area is conducive to the heat being dissipated into the surrounding air through heat conduction and heat convection, thereby improving the heat dissipation efficiency. The branch busbars arranged at intervals allow air to form channels between the branch busbars, which is conducive to air circulation. When hot air is generated around the branch busbars, it can be replaced by cold air in time through these channels, forming a good convection heat dissipation environment. This air flow can continuously take away the heat dissipated by the branch busbars, avoid local accumulation of heat, and further improve the heat dissipation effect. The upper ends of the three branch busbars are fixedly connected to the three upper busbars in a one-to-one correspondence, and the upper ends of the three branch busbars are fixedly connected to the static contact seat 23, so that the heat can be distributed more evenly in the vertical direction. The fixed connection with the static contact seat 23 also helps to transfer the heat generated by the branch busbar to the static contact seat 23, and then further dissipate the heat through the static contact seat 23, or transfer the heat generated by the static contact seat 23 to the branch busbar, and then further dissipate the heat through the branch busbar, thereby achieving balanced heat dissipation and preventing local overheating.

[0029] Similarly, the lower busbar 27 includes three lower busbars arranged in the front-to-back direction. The three lower busbars are spaced apart in the left-to-right direction. The spacing between two adjacent lower busbars can be controlled by the thickness of the small busbars sandwiched between the two adjacent lower busbars. Compared with closely arranging the three lower busbars, the contact area between the lower busbars and the surrounding air is increased. The larger contact area is conducive to the dissipation of heat to the surrounding air through heat conduction and heat convection, thereby improving the heat dissipation efficiency. The spaced lower busbars allow air to form channels between the lower busbars, which is conducive to air circulation. When hot air is generated around the lower busbars, it can be replaced by cold air in a timely manner through these channels, forming a good convection heat dissipation environment. This air flow can continuously carry away the heat dissipated by the lower busbars, preventing heat from accumulating locally, and further improving the heat dissipation effect. The incoming end of the circuit breaker pole 26 faces the gas box rear plate 16. A conductive block 261 is fixed to the incoming end of the circuit breaker pole 26. The front ends of the three lower busbars are fixedly connected to the conductive block 261, and the rear ends of the three lower busbars are fixedly connected to the incoming bushing 3, so that the heat can be distributed more evenly in the horizontal direction. The fixed connection with the conductive block 261 and the incoming bushing 3 also helps to conduct the heat generated by the lower busbar to the conductive block 261 or the incoming bushing 3, and then further dissipate the heat through the conductive block 261 or the incoming bushing 3, or conduct the heat generated by the conductive block 261 or the incoming bushing 3 to the lower busbar, and then further dissipate the heat through the lower busbar, thereby achieving balanced heat dissipation and preventing local overheating.

[0030] To further enhance heat dissipation, in one embodiment of the present invention, heat sinks 7 are provided on the blade holder 25, the stationary contact holder 23, and the lower busbar 27. Thermally conductive silicone grease is applied between the heat sink 7 and the blade holder 25, the stationary contact holder 23, and the lower busbar 27, ensuring that the thermal conductivity of the thermal grease is no less than 3. Thermally conductive silicone grease has a high thermal conductivity and can effectively fill the tiny gaps between the heat sink 7 and the blade holder 25, the stationary contact holder 23, and the lower busbar 27, reducing thermal resistance. This allows the heat generated by these components to be transferred to the heat sink 7 more quickly and efficiently, creating favorable conditions for subsequent heat dissipation. The heat sink 7 itself has a large surface area, which increases the contact area with the air. Combined with the excellent thermal conductivity of the thermally conductive silicone grease, heat from the blade holder 25, the stationary contact holder 23, and the lower busbar 27 can be quickly transferred to the surface of the heat sink 7. This heat is then dissipated into the surrounding air through convection and radiation, thereby improving overall heat dissipation efficiency and reducing component temperatures. Through the synergistic effect of the heat sink 7 and the thermal grease, the temperature of these components can be effectively controlled, which helps to maintain the normal operation of the equipment, extend the service life of the equipment, and improve the reliability and stability of the equipment.

[0031] In one embodiment of the present invention, the pressure relief device 6 includes a flange 61, a metal diaphragm 62, a rupture ring 63, and a pressure ring 64. A pressure relief hole 51 is provided on the heat sink 5. The flange 61 is fixed to the heat sink 5 by screws, so that the flange 61 and the pressure relief hole 51 are coaxially arranged. A sealing ring 65 is provided between the flange 61 and the heat sink 5. The metal diaphragm 62 and the rupture ring 63 are pressed against the flange 61 by the pressure ring 64. The metal diaphragm 62 is recessed toward the interior of the heat sink 5. The rupture ring 63 is located above the metal diaphragm 62. The inner ring of the rupture ring 63 is provided with a circle of barbs 631 that are inclined toward the metal diaphragm 62. When the pressure in the air box body 1 is normal, the metal diaphragm 62 remains recessed toward the inside of the heat sink 5. When the pressure in the air box body 1 exceeds a certain limit, the metal diaphragm 62 will bulge upward. At this time, the barbs 631 on the rupture ring 63 will puncture the metal diaphragm 62, ensuring that the pressure is released only when the pressure reaches a dangerous threshold, avoiding unnecessary pressure relief operations that interfere with the operation of the high-voltage switch assembly in the air box. By releasing excessive pressure in time, the air box body 1 can be prevented from rupturing, exploding, and other serious hazards due to excessive pressure, thereby ensuring the safety of equipment and personnel.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and simple improvements made to the essential contents of the present invention should be included in the scope of protection of the present invention.

Claims

1. An inflatable cabinet gas box, characterized by: It includes an air box body, in which a three-phase high-voltage switch assembly is arranged, and the air box body is provided with an inlet bushing and an outlet bushing that match each phase high-voltage switch assembly one by one, and a heat sink is provided at the upper end of the air box body, and a pressure relief device is provided at the upper end of the heat sink. The heat sink and the air box body are internally connected to form a closed cavity, and the closed cavity is filled with a gas insulating medium. The outer surfaces of the air box body and the heat sink are covered with heat sinks, and thermal grease is applied between the heat sink and the air box body and the heat sink. The heat sink is coated with a black radiation heat absorption coating, and the emissivity of the radiation heat absorption coating is higher than 0.

9.

2. The gas tank of the inflatable cabinet according to claim 1, characterized in that: The air box body includes an air box upper plate, an air box lower plate, an air box left plate, an air box right plate, an air box front plate and an air box rear plate. The air box upper plate, the air box lower plate, the air box left plate, the air box right plate, the air box front plate and the air box rear plate are connected to each other to form a box structure. The upper half of the air box rear plate is moved forward close to the air box front plate through a horizontal plate. The outlet bushing is installed on the air box left plate, and the incoming bushing is installed in an inverted manner on the horizontal plate. The air box upper plate is provided with heat dissipation holes, and the heat dissipation box is installed on the air box upper plate and covers the heat dissipation holes.

3. The gas tank of the inflatable cabinet according to claim 2, characterized in that: Each phase high-voltage switch assembly includes an upper busbar, a branch busbar, a static contact seat, an isolating knife, a knife seat, a circuit breaker pole and a lower busbar. The upper busbar is connected to the outlet bushing, one end of the branch busbar is connected to the upper busbar, and the other end of the branch busbar is connected to the static contact seat. The static contact seat and the knife seat are coaxially arranged. The isolating knife is rod-shaped, and the isolating knife and the knife seat are slidably arranged. The isolating knife and the knife seat are plugged into each other. The knife seat is fixed to the outlet end of the circuit breaker pole, one end of the lower busbar is connected to the incoming end of the circuit breaker pole, and the other end of the lower busbar is connected to the incoming bushing.

4. The gas tank of the inflatable cabinet according to claim 3, characterized in that: The right plate of the gas box is provided with a parallel line sleeve corresponding to the outlet sleeve on the left plate of the gas box. The upper busbar includes three upper busbar rows, and the three upper busbar rows are fixed between the outlet sleeve and the parallel line sleeve at intervals along the front-to-back direction.

5. The gas box of the inflatable cabinet according to claim 4, characterized in that: The branch busbar includes three branch busbars arranged in the up and down directions. The three branch busbars are arranged in a front-to-back spacing between each other. The upper ends of the three branch busbars are fixedly connected to the three upper busbars in a one-to-one correspondence. The upper ends of the three branch busbars are all fixedly connected to the static contact seat.

6. The gas box of the inflatable cabinet according to claim 5, characterized in that: The knife seat and the circuit breaker pole are both horizontally fixed on the front plate of the gas box in the front-to-back direction. The knife seat is located above the circuit breaker pole. A fixing frame is fixed on the rear plate of the gas box behind the knife seat. The static contact seat is fixed on the fixing frame through an insulator. A plurality of heat dissipation plates are provided between the insulator and the static contact seat. The plurality of heat dissipation plates are coaxially arranged at intervals in the front-to-back direction.

7. The gas box of the inflatable cabinet according to claim 6, characterized in that: The lower busbar includes three lower busbar bars arranged along the front-to-back direction, and the three lower busbar bars are arranged at intervals in the left-to-right direction. The incoming end of the circuit breaker pole faces the rear plate of the gas box, and a conductive block is fixed on the incoming end of the circuit breaker pole. The front ends of the three lower busbar bars are fixedly connected to the conductive blocks, and the rear ends of the three lower busbar bars are fixedly connected to the incoming bushings.

8. The gas box of the inflatable cabinet according to claim 7, characterized in that: The knife seat, the static contact seat and the lower busbar are all provided with heat sinks, and thermal grease is applied between the heat sink and the knife seat, the static contact seat and the lower busbar. The thermal conductivity coefficient of the thermal grease is not less than 3.

9. The gas tank of the inflatable cabinet according to claim 8, characterized in that: Reinforcing ribs are fixed on the inner surfaces of the air box upper plate, the air box lower plate, the air box left plate, the air box right plate, the air box front plate and the air box rear plate.

10. The gas tank of the inflatable cabinet according to claim 9, characterized in that: The pressure relief device includes a flange, a metal diaphragm, a rupture ring and a pressure ring. A pressure relief hole is provided on the heat sink. The flange is fixed to the heat sink by nailing. The flange is coaxial with the pressure relief hole. A sealing ring is provided between the flange and the heat sink. The metal diaphragm and the rupture ring are pressed against the flange by the pressure ring. The metal diaphragm is recessed toward the interior of the heat sink. The rupture ring is located above the metal diaphragm. The inner ring of the rupture ring is provided with a circle of barbs inclined toward the metal diaphragm.

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