Explosion-proof power distribution cabinet

Abstract

The invention relates to the technical field of power distribution cabinets, in particular to an explosion-proof power distribution cabinet which comprises a power distribution cabinet shell and multiple sets of electric control power distribution equipment installed in the power distribution cabinet shell, a power distribution cabinet door makes contact with a closing control assembly, and a sealing plug is driven to move through a delay closing control assembly. The two ends of the vertical channel in the sealing plug communicate with the two connectors correspondingly, compressed carbon dioxide in the carbon dioxide storage tank and the connecting pipe can enter the discharging pipe through the vertical channel and the two connectors, flows into the power distribution cabinet shell through the discharging pipe and can be rapidly expanded and diffused into the power distribution cabinet shell, and therefore the carbon dioxide can be discharged out of the discharging pipe. Oxygen and natural gas are gradually extruded to the top of the power distribution cabinet shell along with the increase of the concentration of the carbon dioxide, and are exhausted through an exhaust one-way valve, so that the situation that the oxygen and the natural gas exist in the power distribution cabinet shell after overhauling is completed can be avoided; and the safety performance after the equipment is overhauled is improved.

Description

Technical Field

[0001] The invention relates to the technical field of power distribution cabinets, in particular to an explosion-proof power distribution cabinet. Background Art

[0002] The power distribution cabinet is a kind of system that can realize the switch of electrical equipment and efficient power distribution. It has protection functions such as overload, short circuit, and phase loss protection. It has many advantages such as compact structure, stable operation, and complete functions. The control cabinet can be combined according to the actual control scale. It can realize single cabinet automatic control or multiple cabinets through industrial Ethernet or industrial field bus network to form a distributed control system. The control cabinet can adapt to various large and small scale industrial automation control occasions and is widely used in power, metallurgy, chemical industry, natural gas, papermaking, environmental protection and sewage treatment industries.

[0003] In the prior art, the distribution cabinet and the cabinet door are sealed to prevent external flammable gases and oxygen from entering the interior of the distribution cabinet, thereby avoiding the phenomenon of explosion caused by failure of the distribution cabinet or electric sparks generated during operation meeting with flammable gases.

[0004] However, during the use of explosion-proof distribution cabinets, parts may malfunction or even be damaged. In this case, the cabinet door must be opened for maintenance of its internal components. This cannot prevent flammable chemical gases and oxygen in the air from entering the interior of the cabinet. Although the power supply inside the distribution cabinet needs to be cut off during maintenance, which will not cause electric sparks to ignite flammable gases during maintenance, the flammable gases and oxygen inside the distribution cabinet cannot be discharged after the maintenance is completed. In this case, electrical equipment such as the electric energy meter inside the distribution cabinet may generate sparks or short-circuit due to equipment circuit failure, which can easily lead to internal spontaneous combustion or even explosion.

[0005] In view of the above situation, in order to overcome the above technical problems, the present invention designs an explosion-proof distribution cabinet. Summary of the invention

[0006] The purpose of the present invention is to provide an explosion-proof distribution cabinet, which solves the problem that after maintenance is completed, the combustible gas and oxygen inside the distribution cabinet cannot be discharged. When sparks are generated during the operation of electrical equipment such as an electric energy meter inside the distribution cabinet or a short circuit occurs in the equipment circuit, it is easy to cause the internal electrical appliances to spontaneously combust or even explode. Through the closing action of the cabinet door, the carbon dioxide inside the storage tank is driven to the inside of the distribution cabinet, and the oxygen and other gases inside the distribution cabinet are discharged, thereby reducing the risk of spontaneous combustion and explosion inside the distribution cabinet.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An explosion-proof power distribution cabinet, comprising a power distribution cabinet housing and a plurality of groups of electric control power distribution equipment installed inside the power distribution cabinet housing, wherein a power distribution cabinet door is provided at an opening portion of the power distribution cabinet housing, a door lock structure for locking the power distribution cabinet housing is installed on the power distribution cabinet door, an exhaust check valve is provided on the power distribution cabinet housing, a plurality of carbon dioxide storage tanks are installed on the lower surface of the power distribution cabinet housing, a cylinder is fixedly installed on the inner surface of the power distribution cabinet housing, one end of the cylinder close to the power distribution cabinet door is in a closed state, and interfaces communicating with the inside of the cylinder are fixedly installed on both upper and lower sides of the outer wall of the cylinder, one of the interfaces is connected to a plurality of carbon dioxide storage tanks through a connecting pipe The cylinder is connected to one of the interfaces, and the other interface is connected to a discharge pipe. A sealing plug is arranged inside the cylinder. A vertical channel for connecting the two interfaces is penetrated through the outer wall of the sealing plug. A delayed closing control component is installed at one end of the sealing plug close to the door of the distribution cabinet, and a thermal sensing component is installed at the other end of the sealing plug. The delayed closing control component is driven to move the sealing plug through the closing action of the door of the distribution cabinet, so that the upper and lower ends of the vertical channel are respectively connected to the two interfaces, and the carbon dioxide inside the carbon dioxide storage tank is guided to the inside of the distribution cabinet casing, thereby increasing the gas pressure inside the distribution cabinet casing and discharging the oxygen and other gases inside the distribution cabinet casing.

[0009] Preferably, the delayed closing control component includes an outer cylinder arranged inside the cylinder, one end of the outer cylinder movably passes through the closed end of the cylinder and extends to the outside of the cylinder, the outer cylinder is fixedly connected with an arc-shaped cabinet door contact end, a piston is movably installed inside the outer cylinder, one side of the piston is fixedly connected with a support rod, one end of the support rod is fixedly connected to the sealing plug, and the cabinet door contact end is used to connect to the cabinet door of the distribution cabinet, and one end is arc-shaped.

[0010] Preferably, a supporting spring is installed on the side of the piston close to the distribution cabinet door, and a tension spring is movably sleeved on the outside of the outer cylinder, one end of the tension spring is fixedly installed on the inner wall of the cylinder, and the other end of the tension spring is fixedly installed on the outer wall of the sealing plug, and an oil storage cylinder is installed inside the distribution cabinet casing, and an oil circuit pipe is installed and connected inside the oil storage cylinder, the upper end of the oil circuit pipe is connected to the interior of the outer cylinder, and an oil inlet one-way valve connected to the interior is installed on the outer wall of the cylinder, and the end of the oil inlet one-way valve is connected to the interior of the oil storage cylinder through a one-way oil inlet pipe, and oil inlet and outlet pipes connected to the interior are installed on the outer wall of the oil storage cylinder, and the lower end of the oil inlet and outlet pipes is connected to the interior of the oil storage cylinder, the one-way oil inlet pipe 110 and the oil inlet and outlet pipes 109 can complete the oil inlet work, can increase the oil inlet speed, reduce the movement resistance of the sealing plug 9, so that the door closing action can be completed quickly, and the oil reflux speed can be controlled by reducing the inner diameters of the inlet and outlet pipes 109 and the oil circuit pipe 106.

[0011] Preferably, an air inlet and air outlet is opened on the upper surface of the oil storage cylinder, and the interior of the air inlet and air outlet is connected to the interior of the oil storage cylinder. The air inlet and air outlet can suck the air outside the oil storage cylinder into the interior of the oil storage cylinder to reduce the pressure inside the oil storage cylinder when the oil flows in and out.

[0012] Preferably, the inner diameter of the one-way oil inlet pipe is larger than the inlet and outlet pipes, and the lower ends of the one-way oil inlet pipe and the inlet and outlet pipes extend to the inner bottom of the oil storage cylinder. The provision of two oil inlet channels can greatly increase the oil inlet speed and increase the speed of the sealing plug to the interface.

[0013] Preferably, the thermal sensing component includes a heat conductive sheet, which is fixedly mounted on one side of the electric control and power distribution equipment, the lower end of the heat conductive sheet extends to the inside of the cylinder and is connected to a heat conductive ring, a sealing plate is fixedly mounted on the inner wall of the cylinder, the sealing plate is arranged on the side of the heat conductive ring close to the sealing plug, an inner piston is movably mounted inside the cylinder, the inner piston is arranged on the side of the heat conductive ring away from the sealing plug, a connecting structure for connecting the sealing plug is mounted on the inner piston, the heat conductive sheet can absorb the electric control and power distribution equipment and conduct heat to the heat conductive ring, the air inside the cylinder is heated by the heat conductive ring, and the thrust is generated by the expansion of the air due to heat, which can push the inner piston and the connecting structure to drive the sealing plug to move, so that the upper and lower ends of the vertical channel are respectively connected to the two interfaces, and the carbon dioxide inside the carbon dioxide storage tank is guided to the inside of the distribution cabinet casing, thereby improving the air circulation inside the distribution cabinet casing, and cooling the temperature by absorbing heat through carbon dioxide gasification.

[0014] Preferably, a ventilation port connected to the interior of the cylinder is opened on the outer wall of the cylinder, and the ventilation port is arranged on a side of the sealing plate close to the sealing plug. The setting of the ventilation port can introduce air into the interior of the cylinder to reduce the resistance generated when the sealing plug moves.

[0015] Preferably, the connecting structure includes an arc-shaped guide groove provided on the inner wall of the cylinder, the arc-shaped guide groove is arranged on the side of the heat-conducting ring away from the sealing plate, and a transverse guide groove connected to the arc-shaped guide groove is provided on the outer wall of the cylinder, a guide block is slidably installed inside the arc-shaped guide groove, and the guide block is fixed on the outer wall of the inner piston, a connecting rod is fixedly installed on the outer surface of the inner piston, the end of the connecting rod movably passes through the sealing plate, and a connecting sleeve is movably sleeved on the outer periphery of the end of the connecting rod, and the connecting sleeve is fixedly installed on the outer surface of the sealing plug, and two supporting members are symmetrically fixedly installed on the inner wall of the connecting sleeve, and two symmetrical vertical connecting members are fixedly installed on the outer surface of the end of the connecting rod, which are separated from the two supporting members by the two connecting members and cross-arranged. When the sealing plug actively moves, the sealing plug and the inner piston are in a separated state, the connecting sleeve drives the two supporting members to move, and the two supporting members will not contact the two connecting members, so as to avoid driving the inner piston to move synchronously and cause resistance.

[0016] Preferably, the two support members are arranged at the opening portion of the connecting sleeve, and the two support members are movably connected to the vertical connecting member.

[0017] Preferably, the two vertical connecting members are distributed vertically, the two supporting members are distributed horizontally, and the two supporting members are arranged at 90 degrees to the two vertical connecting members.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. When the door of the distribution cabinet is closed, the door of the distribution cabinet contacts the closing control component, and the sealing plug is driven to move by delaying the closing control component, so that the two ends of the vertical channel on the sealing plug are connected to the two interfaces respectively, and the compressed carbon dioxide in the carbon dioxide storage tank and the connecting pipe can enter the discharge pipe through the vertical channel and the two interfaces, and flow to the inside of the distribution cabinet casing through the discharge pipe. It can quickly expand and diffuse into the inside of the distribution cabinet casing, and increase the carbon dioxide content inside the distribution cabinet casing. As the carbon dioxide concentration increases, oxygen and natural gas are gradually squeezed to the top of the distribution cabinet casing and discharged through the exhaust check valve, which can avoid the presence of oxygen and natural gas in the distribution cabinet casing after maintenance is completed, thereby improving the safety performance of the equipment after maintenance.

[0020] 2. Oil reflux can increase the resistance to the movement of the sealing plug, reduce the movement speed of the sealing plug, and increase the time for carbon dioxide to flow into the inside of the distribution cabinet casing, ensuring that carbon dioxide can fill the entire distribution cabinet casing. The tension spring will gradually pull the sealing plug to move, which can cause the vertical channel opened on the sealing plug to be misaligned with the two interfaces, disconnect the path for carbon dioxide to flow into the inside of the distribution cabinet casing, automatically close the carbon dioxide flow path, and control the flow of carbon dioxide into the inside of the distribution cabinet casing to avoid waste.

[0021] 3. The heat conducting sheet can absorb the heat generated by the operation of the electric control and distribution equipment, and transfer the heat to the heat conducting ring to heat the air inside the cylinder, so that the air expands due to the heat and generates thrust, which can push the inner piston and the connecting structure to drive the sealing plug to move, so that the upper and lower ends of the vertical channel of the sealing plug are respectively connected with the inside of the two interfaces, and the carbon dioxide in the carbon dioxide storage tank and the connecting pipe can be released into the inside of the distribution cabinet casing. In the process of expansion and release of the compressed carbon dioxide, the heat generated by the operation of the electric control and distribution equipment is absorbed, and the carbon dioxide in the expansion and release process can quickly diffuse into the inside of the distribution cabinet casing to avoid the internal temperature of the distribution cabinet casing being too high, and can prevent external oxygen and flammable and explosive gases from entering the distribution cabinet casing while cooling, further improving the safety performance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure inside the housing of the power distribution cabinet of the present invention;

[0024] Figure 3 For the present invention Figure 2 The enlarged structural diagram at a in the middle;

[0025] Figure 4 It is a schematic structural diagram of the thermal sensing component of the present invention;

[0026] Figure 5 For the present invention Figure 4 The enlarged structural diagram at b in the middle;

[0027] Figure 6 It is a schematic diagram of the structure inside the cylinder of the present invention;

[0028] Figure 7 It is a structural schematic diagram of another viewing angle of the inside of the cylinder of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the guide block of the present invention.

[0030] In the figure: 1. power distribution cabinet housing; 11. electric control power distribution equipment; 2. power distribution cabinet door; 3. door lock structure; 4. exhaust check valve; 5. thermal sensing component; 51. heat conductive sheet; 52. heat conductive ring; 53. sealing plate; 54. inner piston; 55. connection structure; 551. connecting rod; 552. connecting sleeve; 553. vertical connecting piece; 554. supporting piece; 555. arc guide groove; 556. horizontal guide groove; 557. guide block; 6. carbon dioxide storage tank; 7. Cylinder; 71. Ventilation port; 8. Interface; 81. Discharge pipe; 82. Connecting pipe; 9. Sealing plug; 91. Vertical channel; 10. Delayed closure control assembly; 101. Support rod; 102. Piston; 103. Outer cylinder; 104. Support spring; 105. Door contact end; 106. Oil pipe; 107. Oil storage cylinder; 108. Inlet and outlet holes; 109. Oil inlet and outlet pipes; 110. One-way oil inlet pipe; 111. Oil inlet one-way valve; 112. Tension spring. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 and Figure 2The present invention provides an explosion-proof power distribution cabinet, and the technical solution is as follows:

[0033] An explosion-proof power distribution cabinet, comprising a power distribution cabinet housing 1 and a plurality of groups of electric control power distribution equipment 11 installed inside the power distribution cabinet housing 1, a power distribution cabinet door 2 is provided at the opening portion of the power distribution cabinet housing 1, a door lock structure 3 for locking the power distribution cabinet housing 1 is installed on the power distribution cabinet door 2, the power distribution cabinet housing 1 is provided with an exhaust check valve 4, the exhaust check valve 4 is connected to the inside of the power distribution cabinet housing 1, and the exhaust check valve 4 can only exhaust to the outside of the power distribution cabinet housing 1, and a plurality of carbon dioxide storage tanks 6 are installed on the lower surface of the power distribution cabinet housing 1, and the carbon dioxide storage tanks 6 store compressed carbon dioxide Carbon dioxide is used to discharge oxygen and flammable and explosive gases inside the power distribution cabinet casing 1 to prevent explosion caused by oxygen-assisted combustion. At the same time, the inside of the power distribution cabinet casing 1 can be cooled down at the same time. Compressed carbon dioxide has the advantages of low price and easy production. A cylinder 7 is fixedly installed on the inner surface of the power distribution cabinet casing 1. The end of the cylinder 7 close to the power distribution cabinet door 2 is in a closed state. Interfaces 8 connected to the inside of the cylinder 7 are fixedly installed on the upper and lower sides of the outer wall of the cylinder 7. One of the interfaces 8 is connected to a plurality of carbon dioxide storage tanks 6 through a connecting pipe 82, and the other interface 8 is connected to a discharge pipe 81, a sealing plug 9 is arranged inside the cylinder 7, a vertical channel 91 for connecting the two interfaces 8 is penetrated on the outer wall of the sealing plug 9, a delayed closing control component 10 is installed at one end of the sealing plug 9 close to the cabinet door 2 of the power distribution cabinet, and a thermal sensing component 5 is installed at the other end of the sealing plug 9. In use, the delayed closing control component 10 and the sealing plug 9 can be driven to move by closing the cabinet door 2 of the power distribution cabinet, so that the two ends of the vertical channel 91 on the sealing plug 9 are connected to the two interfaces 8 respectively, so that the carbon dioxide storage tank 6 can be connected to the compressed two carbon dioxide inside the connecting pipe 82. Carbon oxide enters the discharge pipe 81 through the vertical channel 91 and the two interfaces 8, and flows to the inside of the distribution cabinet casing 1 through the discharge pipe 81. It can quickly expand and diffuse into the inside of the distribution cabinet casing 1, thereby increasing the carbon dioxide content inside the distribution cabinet casing 1 (and the mass of carbon dioxide is greater than the mass of oxygen and natural gas). As the carbon dioxide concentration increases, oxygen and natural gas are gradually squeezed to the top of the distribution cabinet casing 1 and discharged through the exhaust check valve 4, thereby avoiding the presence of oxygen and natural gas in the distribution cabinet casing 1 after maintenance is completed, thereby improving the safety performance of the equipment after maintenance.

[0034] As an embodiment of the present invention, refer to Figure 2 and Figure 3The delayed closing control assembly 10 includes an outer cylinder 103 disposed inside the cylinder 7, one end of the outer cylinder 103 movably passes through the closed end of the cylinder 7 and extends to the outside of the cylinder 7, the outer cylinder 103 is fixedly connected with an arc-shaped cabinet door contact end 105, a piston 102 is movably installed inside the outer cylinder 103, one side of the piston 102 is fixedly connected with a support rod 101, one end of the support rod 101 is fixedly connected to the sealing plug 9, a support spring 104 is installed on the side of the piston 102 close to the cabinet door 2 of the power distribution cabinet, and the outer cylinder 103 The outer movable sleeve is provided with a tension spring 112, the tension generated by the tension spring 112 is greater than the elastic force generated by the support spring 104, one end of the tension spring 112 is fixedly mounted on the inner wall of the cylinder 7, and the other end of the tension spring 112 is fixedly mounted on the outer wall of the sealing plug 9, an oil storage cylinder 107 is installed inside the power distribution cabinet housing 1, and an oil pipe 106 is installed inside the oil storage cylinder 107 and connected, and the upper end of the oil pipe 106 is connected to the inside of the outer cylinder 103, and an oil inlet one-way valve connected to the inside is installed on the outer wall of the cylinder 7. The end of the oil inlet check valve 111 is connected to the inside of the oil storage cylinder 107 through the one-way oil inlet pipe 110. The outer wall of the oil storage cylinder 107 is equipped with an oil inlet and outlet pipe 109 connected to the inside. The lower end of the oil inlet and outlet pipe 109 is connected to the inside of the oil storage cylinder 107. The inner diameter of the one-way oil inlet pipe 110 is larger than the oil inlet and outlet pipe 109. The lower ends of the one-way oil inlet pipe 110 and the oil inlet and outlet pipe 109 extend to the inner bottom of the oil storage cylinder 107. This arrangement can prevent the oil from sucking air into the one-way oil inlet pipe 110 and the inlet and outlet pipes. Inside the oil pipe 109, the inner diameters of the inlet and outlet oil pipes 109 and the oil circuit pipe 106 are both smaller than the one-way oil inlet pipe 110. In the oil-inlet state, the one-way oil inlet pipe 110 and the inlet and outlet oil pipes 109 can both complete the oil-inlet work, thereby increasing the oil-inlet speed, so that the sealing plug 9 has little resistance and moves quickly. By reducing the inner diameters of the inlet and outlet oil pipes 109 and the oil circuit pipe 106, the oil reflux speed can be controlled, thereby controlling the reset speed of the sealing plug 9. Controlling the tension generated by the tension spring 112 can adjust the movement speed of the sealing plug 9.

[0035] As an embodiment of the present invention, refer to Figure 3 An air inlet and outlet hole 108 is provided on the upper surface of the oil storage cylinder 107 , and the interior of the air inlet and outlet hole 108 is connected with the interior of the oil storage cylinder 107 . During the oil inlet and outlet process of the oil storage cylinder 107 , air is sucked in or exhausted through the air inlet and outlet hole 108 .

[0036] As an embodiment of the present invention, refer to Figure 4 , Figure 5 , Figure 6 and Figure 7The thermal sensing component 5 includes a heat conductive sheet 51, which is fixedly installed on one side of the electric control distribution equipment 11. The lower end of the heat conductive sheet 51 extends to the inside of the cylinder 7 and is connected to a heat conductive ring 52. A sealing plate 53 is fixedly installed on the inner wall of the cylinder 7. The sealing plate 53 is arranged on the side of the heat conductive ring 52 close to the sealing plug 9. An inner piston 54 is movably installed inside the cylinder 7. The inner piston 54 is arranged on the side of the heat conductive ring 52 away from the sealing plug 9. A connecting structure 55 for connecting the sealing plug 9 is installed on the inner piston 54. In use, the heat conductive sheet 51 can absorb the heat of the electric control distribution equipment 11 and conduct the heat to the heat conductive ring 52, and the air inside the cylinder 7 is heated by the heat conductive ring 52 (the sealing plate 53 and the sealing plug 9 are connected to each other). The air between the inner piston 54 generates thrust through the heat expansion of the air, which can push the inner piston 54 and the connecting structure 55 to drive the sealing plug 9 to move, so that the upper and lower ends of the vertical channel 91 of the sealing plug 9 are respectively connected to the inside of the two interfaces 8 (in the air intake state), and the carbon dioxide in the carbon dioxide storage tank 6 and the connecting pipe 82 can be released into the distribution cabinet casing 1. The heat is absorbed during the release process of carbon dioxide gasification, and the gasified carbon dioxide can quickly diffuse into the distribution cabinet casing 1, so as to avoid the internal temperature of the distribution cabinet casing 1 being too high, and it can prevent external oxygen and flammable and explosive gases from entering the distribution cabinet casing 1 while cooling down, thereby further improving the safety performance of the equipment.

[0037] As an embodiment of the present invention, refer to Figure 6 A ventilation port 71 connected to the interior of the cylinder 7 is provided on the outer wall of the cylinder 7. The ventilation port 71 is arranged on the side of the sealing plate 53 close to the sealing plug 9. The ventilation port 71 can discharge the incoming air during the reciprocating movement of the sealing plug 9, thereby reducing the resistance generated during the movement of the sealing plug 9.

[0038] As an embodiment of the present invention, refer to Figure 6 , Figure 7 and Figure 8The connecting structure 55 includes an arc-shaped guide groove 555 provided on the inner wall of the cylinder 7, the arc-shaped guide groove 555 is provided on the side of the heat-conducting ring 52 away from the sealing plate 53, and a transverse guide groove 556 connected to the arc-shaped guide groove 555 is provided on the outer wall of the cylinder 7. A guide block 557 is slidably installed inside the arc-shaped guide groove 555, and the guide block 557 is fixed on the outer wall of the inner piston 54. A connecting rod 551 is fixedly installed on the outer surface of the inner piston 54, and the end of the connecting rod 551 movably passes through the sealing plate 5 3. The outer periphery of the end of the connecting rod 551 is movably sleeved with a connecting sleeve 552, which is fixedly mounted on the outer surface of the sealing plug 9. Two supporting members 554 are fixedly mounted on the inner wall of the connecting sleeve 552, and two symmetrical vertical connecting members 553 are fixedly mounted on the outer surface of the end of the connecting rod 551. The inner piston 54 moves along the arc-shaped guide groove 555 through the guide block 557, and during the movement, the outer wall of the guide block 557 contacts the inner wall of the arc-shaped guide groove 555 to generate a rotation. The thrust of rotation, when the guide block 557 moves to the tail end of the arc-shaped guide groove 555, the inner piston 54 rotates ninety degrees, and at the same time, drives the connecting rod 551 and the two vertical connecting members 553 to rotate ninety degrees, so that the two vertical connecting members 553 are adjusted to a horizontal state, and after the two vertical connecting members 553 are adjusted, they contact the two support members 554. In the process of the inner piston 54 moving through the guide block 557 in the horizontal guide groove 556, the vertical connecting member 553 can drive the support member 554, the connecting sleeve 552 and the sealing plug 9 to move, so that the upper and lower ends of the vertical channel 91 of the sealing plug 9 are respectively connected to the inside of the two interfaces 8 (in the air intake state), and are separated from the two support members 554 through the two vertical connecting members 553 and cross-arranged. When the sealing plug 9 actively moves, the connecting sleeve 552 drives the two support members 554 to move, and the two support members 554 will not contact the two vertical connecting members 553, so as to avoid driving the inner piston 54 to move synchronously and cause resistance.

[0039] As an embodiment of the present invention, refer to Figure 6 , Figure 7 and Figure 8 , two support members 554 are arranged at the opening part of the connecting sleeve 552, the two support members 554 are movably connected with the vertical connecting members 553, the two vertical connecting members 553 are vertically distributed, the two support members 554 are horizontally distributed, the two support members 554 and the two vertical connecting members 553 are cross-arranged at 90 degrees, when the guide block 557 moves from the front end of the arc-shaped guide groove 555 to the tail end of the arc-shaped guide groove 555, the inner piston 54 rotates 90 degrees, so that the two vertical connecting members 553 rotate synchronously by 90 degrees, so that the two vertical connecting members 553 collide with the two support members 554.

[0040] Working principle:

[0041] During maintenance, the door lock structure 3 is used to release the fixation between the switch cabinet door 2 and the switch cabinet housing 1 and open the switch cabinet door 2. When the switch cabinet door 2 moves, it will separate from the door contact end 105, releasing the limit between the door contact end 105 and the outer cylinder 103, so that the outer cylinder 103 can extend to the outside of the cylinder 7. At this time, the elastic force of the support spring 104 can push the outer cylinder 103 to move to the outside of the switch cabinet housing 1 (due to the pulling force generated by the tension spring 112). The tension of the tension spring 112 is greater than the elastic force generated by the support spring 104, and the tension of the tension spring 112 will pull the sealing plug 9, the support rod 101 and the piston 102 to a stationary state, in which the vertical channel 91 of the sealing plug 9 is separated from the two interfaces 8). The sealing plug 9 is in a stationary state, and the outer cylinder 103 is in a movement of extending outward, so that the internal space of the outer cylinder 103 is increased to generate negative pressure suction, and the oil in the oil storage cylinder 107 is sucked into the internal space of the outer cylinder 103 through the negative pressure suction;

[0042] After the inspection is completed, the switch cabinet door 2 moves and closes with the switch cabinet housing 1. The switch cabinet door 2 moves, which pushes the switch cabinet door contact end 105 and the outer cylinder 103 to move inside the switch cabinet housing 1. When the outer cylinder 103 moves and the position of the piston 102 changes, the oil inside the outer cylinder 103 is squeezed into the oil pipe 106 and the oil storage cylinder 107 (in this process, the rebound force generated by the support spring 104 and the small inner diameter of the oil pipe 106 will increase the resistance and reduce the oil outflow speed). At this time, the oil inside the outer cylinder 103 will play a supporting role, so that the outer cylinder 103, the piston 102 and the support rod 101 form a slow contraction. The short support structure pushes the sealing plug 9 to move inside the cylinder 7 during the movement of the support rod 101 into the cabinet 1 (during this process, the movement of the sealing plug 9 generates negative pressure inside the cylinder 7, and the oil inside the oil storage cylinder 107 is sucked into the cylinder 7 through the one-way oil inlet pipe 110 and the oil inlet and outlet pipes 109). When the cabinet door 2 of the cabinet is completely closed with the cabinet 1, the upper and lower ends of the vertical channel 91 of the sealing plug 9 are respectively connected to the inside of the two interfaces 8 (in the air intake state), so that the carbon dioxide in the carbon dioxide storage tank 6 and the connecting pipe 82 can flow into the cabinet 1 through the interface 8 and the vertical channel 91;

[0043] While guiding the carbon dioxide into the inside of the switch cabinet housing 1, the tension of the tension spring 112 is greater than the elastic force of the support spring 104, and the tension spring 112 will gradually pull the sealing plug 9 to move (and gradually compress the support spring 104), and the oil inside the cylinder 7 will only flow back to the inside of the oil storage outer cylinder 103 through the inlet and outlet oil pipes 109 (the oil inlet check valve 111 and the one-way oil inlet pipe 110 only flow in and do not flow back). At the same time, the oil inside the outer cylinder 103 is also squeezed by the piston 102 and gradually flows back through the oil pipe 106. It flows to the inside of the oil storage cylinder, and the moving speed of the sealing plug 9 is reduced by oil reflux, which increases the time for carbon dioxide to flow into the distribution cabinet casing 1, ensuring that the carbon dioxide can fill the entire distribution cabinet casing 1, and the tension spring 112 will gradually pull the sealing plug 9 to move, so that the vertical channel 91 opened on the sealing plug 9 can be misaligned with the two interfaces 8, which can disconnect the path for carbon dioxide to flow into the distribution cabinet casing 1, and can control the flow of carbon dioxide into the distribution cabinet casing 1 to avoid waste.

[0044] During use, the heat conducting sheet 51 can absorb the heat from the electric control distribution equipment 11 and transfer the heat to the heat conducting ring 52, and the air inside the cylinder 7 (the air between the sealing plate 53 and the inner piston 54) is heated by the heat conducting ring 52. The thrust generated by the heat expansion of the air can push the inner piston 54 and the connecting structure 55 to drive the sealing plug 9 to move. The inner piston 54 moves along the arc-shaped guide groove 555 through the guide block 557, and during the movement, the outer wall of the guide block 557 contacts the inner wall of the arc-shaped guide groove 555 to generate a rotational thrust. When the guide block 557 moves to the arc-shaped guide groove 555, the inner wall of the guide block 557 contacts the inner wall of the arc-shaped guide groove 555 to generate a rotational thrust. When the inner piston 54 is at the tail end, it rotates ninety degrees, and at the same time, drives the connecting rod 551 and the two vertical connecting members 553 to rotate ninety degrees, so that the two vertical connecting members 553 are adjusted to the horizontal state, and after the two vertical connecting members 553 are adjusted, they contact with the two support members 554. When the inner piston 54 moves through the guide block 557 in the horizontal guide groove 556, it can drive the support member 554, the connecting sleeve 552 and the sealing plug 9 to move through the vertical connecting member 553, so that the upper and lower ends of the vertical channel 91 of the sealing plug 9 are respectively connected to the inside of the two interfaces 8 (in the air intake state).

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof distribution cabinet, characterized in that: The invention comprises a power distribution cabinet casing (1) and a plurality of groups of electric control distribution equipment (11) installed inside the power distribution cabinet casing (1); a power distribution cabinet door (2) is arranged at the opening of the power distribution cabinet casing (1); a door lock structure (3) for locking the power distribution cabinet casing (1) is installed on the power distribution cabinet door (2); an exhaust check valve (4) is arranged on the power distribution cabinet casing (1); a plurality of carbon dioxide storage tanks (6) are installed on the lower surface of the power distribution cabinet casing (1); a cylinder (7) is fixedly installed on the inner surface of the power distribution cabinet casing (1); one end of the cylinder (7) close to the power distribution cabinet door (2) is in a closed state; Interfaces (8) communicating with the interior of the cylinder (7) are fixedly mounted on both upper and lower sides of the outer wall of the cylinder (7), one of the interfaces (8) being connected to a plurality of carbon dioxide storage tanks (6) via a connecting pipe (82), and the other interface (8) being connected to a discharge pipe (81). A sealing plug (9) is arranged inside the cylinder (7), and a vertical passage (91) for connecting the two interfaces (8) is penetrated through the outer wall of the sealing plug (9), and a delayed closing control component (10) is mounted on one end of the sealing plug (9) close to the door (2) of the power distribution cabinet, and a thermal sensing component (5) is mounted on the other end of the sealing plug (9).

2. The explosion-proof power distribution cabinet according to claim 1, characterized in that: The delayed closing control assembly (10) comprises an outer cylinder (103) arranged inside the cylinder (7), one end of the outer cylinder (103) movably passes through the closed end of the cylinder (7) and extends to the outside of the cylinder (7), the outer cylinder (103) is fixedly connected to an arc-shaped cabinet door contact end (105), a piston (102) is movably installed inside the outer cylinder (103), one side of the piston (102) is fixedly connected to a support rod (101), and the other end of the support rod (101) is fixedly connected to a sealing plug (9).

3. An explosion-proof power distribution cabinet according to claim 2, characterized in that: A support spring (104) is installed on the side of the piston (102) close to the switch cabinet door (2); a tension spring (112) is movably sleeved on the outside of the outer cylinder (103); one end of the tension spring (112) is fixedly installed on the inner wall of the cylinder (7); the other end of the tension spring (112) is fixedly installed on the outer wall of the sealing plug (9); an oil storage cylinder (107) is installed inside the switch cabinet housing (1); and an oil storage cylinder (107) is installed inside and connected to the oil storage cylinder (107). An oil pipe (106) is provided, the upper end of the oil pipe (106) is connected to the interior of the outer cylinder (103), an oil inlet check valve (111) connected to the interior is installed on the outer wall of the cylinder (7), an end of the oil inlet check valve (111) is connected to the interior of the oil storage cylinder (107) through a one-way oil inlet pipe (110), an oil inlet and outlet pipe (109) connected to the interior is installed on the outer wall of the oil storage cylinder (107), and the lower end of the oil inlet and outlet pipe (109) is connected to the interior of the oil storage cylinder (107).

4. The explosion-proof power distribution cabinet according to claim 3, characterized in that: An air inlet and outlet hole (108) is provided on the upper surface of the oil storage cylinder (107), and the interior of the air inlet and outlet hole (108) is communicated with the interior of the oil storage cylinder (107).

5. The explosion-proof power distribution cabinet according to claim 4, characterized in that: The inner diameter of the one-way oil inlet pipe (110) is larger than that of the oil inlet and outlet pipes (109), and the lower ends of the one-way oil inlet pipe (110) and the oil inlet and outlet pipes (109) both extend to the inner bottom of the oil storage cylinder (107).

6. An explosion-proof power distribution cabinet according to claim 5, characterized in that: The thermal sensing component (5) comprises a heat conductive sheet (51), the heat conductive sheet (51) is fixedly mounted on one side of the electric control distribution equipment (11), the lower end of the heat conductive sheet (51) extends into the interior of the cylinder (7) and is connected to a heat conductive ring (52), a sealing plate (53) is fixedly mounted on the inner wall of the cylinder (7), the sealing plate (53) is arranged on a side of the heat conductive ring (52) close to the sealing plug (9), an inner piston (54) is movably mounted inside the cylinder (7), the inner piston (54) is arranged on a side of the heat conductive ring (52) away from the sealing plug (9), and a connecting structure (55) for connecting to the sealing plug (9) is mounted on the inner piston (54).

7. An explosion-proof power distribution cabinet according to claim 6, characterized in that: The outer wall of the cylinder (7) is provided with a ventilation port (71) which is in communication with the interior of the cylinder (7). The ventilation port (71) is arranged on a side of the sealing plate (53) close to the sealing plug (9).

8. The explosion-proof power distribution cabinet according to claim 6, characterized in that: The connection structure (55) comprises an arc-shaped guide groove (555) formed on the inner wall of the cylinder (7), the arc-shaped guide groove (555) being arranged on the side of the heat-conducting ring (52) away from the sealing plate (53), a transverse guide groove (556) communicating with the arc-shaped guide groove (555) being formed on the outer wall of the cylinder (7), a guide block (557) being slidably mounted inside the arc-shaped guide groove (555), the guide block (557) being fixed on the outer wall of the inner piston (54), and the inner piston (54) ) is fixedly mounted on the outer surface of the sealing plug (9), the end of the connecting rod (551) is movably inserted through the sealing plate (53), the outer periphery of the end of the connecting rod (551) is movably sleeved with a connecting sleeve (552), the connecting sleeve (552) is fixedly mounted on the outer surface of the sealing plug (9), two supporting members (554) are symmetrically mounted on the inner wall of the connecting sleeve (552), and two symmetrical vertical connecting members (553) are fixedly mounted on the outer surface of the end of the connecting rod (551).

9. An explosion-proof power distribution cabinet according to claim 8, characterized in that: The two support members (554) are arranged at the opening of the connecting sleeve (552), and the two support members (554) are movably connected to the vertical connecting member (553).

10. An explosion-proof power distribution cabinet according to claim 9, characterized in that: The two vertical connecting members (553) are distributed vertically, the two supporting members (554) are distributed horizontally, and the two supporting members (554) and the two vertical connecting members (553) are arranged to cross each other at a 90-degree angle.

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