High protection type explosion-proof power distribution device

Abstract

The invention belongs to the technical field of power distribution equipment, and particularly relates to a high-protection type explosion-proof power distribution device, which comprises a power distribution cabinet and a back plate arranged in the power distribution cabinet, and further comprises an inflation protection unit arranged on the side wall of the back plate and communicated with the interior of the power distribution cabinet, and the inflation protection unit is filled with helium; the air pressure regulation and control unit is arranged at the top of the power distribution cabinet and is communicated with the interior of the power distribution cabinet; and the two voltage reduction units are arranged at the bottom of the power distribution cabinet and are communicated with the interior of the power distribution cabinet. The positive pressure design is adopted, explosion-proof protection is carried out on the power distribution cabinet, the air pressure stability of the positive pressure gas in the power distribution cabinet can be kept, the explosion-proof effect is good, meanwhile, the positive pressure gas can be used for cooling the power distribution cabinet, and personnel are automatically reminded to maintain the power distribution cabinet based on the power distribution power of the power distribution cabinet.

Description

Technical Field

[0001] The invention belongs to the technical field of power distribution equipment, and in particular relates to a high-protection explosion-proof power distribution device. Background Art

[0002] The underground environment of coal mines is complex, and there are flammable and explosive gases such as gas. The underground power distribution equipment in coal mines undertakes the important task of distributing electricity to ventilation, drainage, lifting and other equipment. It adopts a flameproof structure with a sturdy casing and good sealing, which can prevent the spread of explosions. It is of great significance to the safe production of coal mines and the smooth development of various operations.

[0003] At present, there are many types of explosion-proof structures for power distribution devices, such as flameproof type (using a solid shell and sealed structure for explosion-proof impact protection), increased safety type (using high-quality insulating materials, reasonable electrical clearance and creepage distance, etc.), positive pressure type (protective gas is usually filled inside the equipment to make the internal pressure of the equipment higher than the external pressure), etc. The explosion-proof type has high requirements for material strength and sealing structure, and has poor explosion-proof effect on the power distribution system inside the distribution cabinet. As the use time increases and the insulating material ages, the explosion-proof effect of the increased safety type will become worse and worse. The positive pressure type is filled with protective gas. Based on the principle of flow from high-pressure area to low-pressure area, the dangerous gas outside the coal mine is not easy to enter the distribution device, which can better avoid the explosion of the distribution device. However, since the distribution device needs to undertake the work of power distribution, it will generate more heat during work. Under the action of thermal expansion, the pressure of the protective gas will continue to rise. As the pressure increases, the high pressure inside the distribution device will cause excessive squeezing of the sealing structure, which may cause leakage of the protective gas and affect the explosion-proof effect of the distribution device. Summary of the invention

[0004] The purpose of the present invention is to provide a high-protection explosion-proof power distribution device in view of the above problems.

[0005] To achieve the above object, the present invention adopts the following technical scheme: a high protection explosion-proof power distribution device, including a power distribution cabinet and a back plate installed inside the power distribution cabinet, and also includes: An inflatable protection unit is arranged on the side wall of the back plate and is connected to the interior of the power distribution cabinet, and the inflatable protection unit is filled with helium; An air pressure control unit is arranged on the top of the power distribution cabinet and is connected to the inside of the power distribution cabinet; Two step-down units are arranged at the bottom of the power distribution cabinet and are connected to the inside of the power distribution cabinet; A heat dissipation unit is arranged inside the power distribution cabinet, a circulating air supply mechanism is installed on the back of the power distribution cabinet, the heat dissipation unit is connected with the circulating air supply mechanism, and the heat dissipation unit is connected with the inflation protection unit; A control mainboard is arranged inside the power distribution cabinet, and the inflation protection unit, the air pressure regulating unit, the pressure reducing unit and the circulating air supply mechanism are all electrically connected to the control mainboard.

[0006] Preferably, the inflation protection unit includes a helium storage tank fixedly mounted on the side wall of the back plate, a ventilation pipe is fixedly plugged into one side of the top of the helium storage tank, a first manual valve is installed inside the ventilation pipe, the ventilation pipe is fixedly connected to an outlet pipe, and a side wall of the outlet pipe is fixedly connected to an inflation pipe, a sealing cover is fixedly mounted on the back of the power distribution cabinet, and the sealing cover is connected to the inflation pipe, an air inlet pipe connected to the sealing cover is fixedly plugged into the back of the power distribution cabinet, a first electric-controlled valve is installed inside the air inlet pipe, a second electric-controlled valve is fixedly mounted inside the inflation pipe, a third electric-controlled valve is installed inside the outlet pipe at a position above the inflation pipe, and the first electric-controlled valve, the second electric-controlled valve and the third electric-controlled valve are all electrically connected to the control main board.

[0007] Preferably, the air pressure regulating unit includes a barrel installed on the top of a power distribution cabinet, a circular hole connected to the barrel is opened on the top of the power distribution cabinet, an upper piston is slidably provided inside the barrel, an insulating column is fixedly installed on the top of the upper piston, and a resistance rod is fixedly installed on the top of the insulating column, an insulating sleeve is fixedly installed on the inner wall of the barrel, and a supporting spring is fixedly provided between the insulating sleeve and the upper piston, a conductive ring matching the resistance rod is fixedly installed inside the insulating sleeve, and the conductive ring is coaxial with the resistance rod, an electromagnetic switch electrically connected to the conductive ring and the resistance rod is fixedly installed inside the barrel, and the electromagnetic switch is electrically connected to the control main board, and the electromagnetic switch is electrically connected to the first electric control valve, the second electric control valve and the third electric control valve through the control main board.

[0008] Preferably, the two step-down units each include an underground magnetic isolation cylinder fixedly mounted on the bottom of the power distribution cabinet, a pressure relief hole connected to the buried magnetic isolation cylinder is opened at the bottom of the power distribution cabinet, a lower piston is slidably mounted inside the buried magnetic isolation cylinder, and an iron rod is fixedly mounted at the bottom of the lower piston, a return spring is fixedly mounted between the lower piston and the inner wall of the buried magnetic isolation cylinder, an electromagnetic component is fixedly mounted on the inner bottom of the buried magnetic isolation cylinder, the electromagnetic component is electrically connected to the conductive ring and the resistor rod through the control main board, and a plurality of air holes are opened at the lower end of the side wall of the buried magnetic isolation cylinder.

[0009] Preferably, the heat dissipation unit includes a heat-conducting square cover arranged above two buried magnetic isolation cylinders, and the two heat-conducting square covers are fixedly connected to the inner wall of the power distribution cabinet, the outer walls of the two buried magnetic isolation cylinders are fixedly sleeved with heat-conducting annular covers, and the two heat-conducting annular covers and the heat-conducting square covers on the same side are commonly fixedly connected with a connecting pipe, the inner bottom of the power distribution cabinet is fixedly installed with a mounting cover, and the control main board is fixedly arranged inside the mounting cover, the tops of the two heat-conducting annular covers are fixedly plugged with return pipes, and the two return pipes are connected to the mounting cover, and the mounting cover and the helium storage tank are commonly connected with a return flow detection component.

[0010] Preferably, the circulating air supply mechanism includes a fixed cover fixedly mounted on the outer wall of the sealing cover, a piston pump is provided inside the fixed cover, and the piston pump is fixedly connected to the outer wall of the sealing cover, the air outlet end of the piston pump is connected to the interior of the sealing cover, two heat dissipation pipes are fixedly plugged into the back of the power distribution cabinet, and the two heat-conducting square covers are connected to the interior of the sealing cover through the heat dissipation pipes on the same side, the air outlet pipe is connected to the air intake end of the piston pump through the fixed cover, and the power distribution cabinet and the air outlet pipe are jointly equipped with a suction assembly.

[0011] Preferably, the backflow detection assembly includes a detection tube fixedly plugged into the lower back side of the power distribution cabinet, and a gas flow meter is installed inside the detection tube, the detection tube is connected to the mounting cover, the gas flow meter is electrically connected to the control main board, and the control main board transmits the flow data monitored by the gas flow meter to the terminal computer, and a tail pipe connected to the detection tube is fixedly plugged into the lower end of the side wall of the helium storage tank, and a second manual valve and a check valve are installed inside the tail pipe.

[0012] Preferably, the withdrawal assembly includes a withdrawal pipe fixedly plugged into the back of the power distribution cabinet, and the end of the withdrawal pipe away from the power distribution cabinet passes through the side wall of the sealing cover and is connected to the air outlet pipe, a fourth electrically-controlled valve is installed inside the withdrawal pipe, a supplementary hole is provided on the side wall of the power distribution cabinet, and a fifth electrically-controlled valve is installed inside the supplementary hole, an exhaust hole is provided on the top of the sealing cover, and a sixth electrically-controlled valve is installed inside the exhaust hole, and the fourth electrically-controlled valve, the fifth electrically-controlled valve and the sixth electrically-controlled valve are all electrically connected to the control main board.

[0013] Compared with the existing technology, the advantages of a high protection explosion-proof distribution device are: 1. Through the cooperation of the distribution cabinet, back panel and gas-filled protection unit, protective gas can be filled into the distribution cabinet to prevent the combustible gas outside the coal mine from entering the distribution cabinet by means of positive air pressure. The cooperation of the air pressure control unit and the pressure reduction unit can ensure that the air pressure inside the distribution cabinet remains stable as much as possible, ensuring the explosion-proof protection effect of the positive air pressure on the distribution cabinet. The pressure reduction unit can also relieve the explosion pressure when an explosion occurs, further improving the explosion-proof effect of the distribution cabinet.

[0014] 2. Through the cooperation of the heat dissipation unit and the circulating gas supply mechanism, the step-down unit can be used to conduct the heat inside the distribution cabinet into the ground using the protective gas. The heat dissipation efficiency is high, which reduces the impact of the heat inside the distribution cabinet on the protective gas, and indirectly improves the explosion-proof protection effect of the protective gas on the inside of the distribution cabinet.

[0015] 3. Through the backflow detection component, the flow rate of the heat dissipation gas can reflect the temperature inside the distribution cabinet, and automatically remind personnel to perform maintenance inside the distribution cabinet to ensure the timeliness of maintenance inside the distribution cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a high-protection explosion-proof power distribution device provided by the present invention; Figure 2 It is a structural schematic diagram of a gas-filled protection unit of a high-protection explosion-proof power distribution device provided by the present invention; Figure 3 The invention provides a high protection explosion-proof power distribution device Figure 2 A magnified view of the structure of part A; Figure 4 It is a structural schematic diagram of a gas pressure control unit of a high-protection explosion-proof power distribution device provided by the present invention; Figure 5 The invention provides a high protection explosion-proof power distribution device Figure 4 A magnified view of the structure of part B; Figure 6 It is a structural schematic diagram of a voltage reduction unit of a high-protection explosion-proof power distribution device provided by the present invention; Figure 7 The invention provides a high protection explosion-proof power distribution device Figure 2 A magnified view of the structure of part C.

[0017] In the figure: 1 power distribution cabinet, 2 back plate, 3 inflation protection unit, 31 helium storage tank, 32 ventilation pipe, 33 first manual valve, 34 outlet pipe, 35 inflation pipe, 36 sealing cover, 37 intake pipe, 38 first electric control valve, 39 second electric control valve, 310 third electric control valve, 4 air pressure control unit, 41 barrel, 42 round hole, 43 upper piston, 44 insulating column, 45 resistance rod, 46 insulating sleeve, 47 support spring, 48 conductive ring, 49 electromagnetic switch, 5 pressure reduction unit, 51 buried magnetic isolation cylinder, 52 pressure relief hole, 53 lower piston, 54 iron rod, 55 reset Spring, 56 electromagnetic component, 57 air vent, 6 heat dissipation unit, 61 heat conductive square cover, 62 heat conductive annular cover, 63 connecting pipe, 64 installation cover, 65 reflux pipe, 66 reflux detection assembly, 661 detection tube, 662 gas flow meter, 663 tail pipe, 664 second manual valve, 665 check valve, 7 circulating air supply mechanism, 71 fixed cover, 72 piston pump, 73 heat dissipation pipe, 74 withdrawal assembly, 741 withdrawal pipe, 742 fourth electric control valve, 743 supplementary hole, 744 fifth electric control valve, 745 exhaust hole, 746 sixth electric control valve, 8 control main board. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] like Figure 1-Figure 7 As shown, a high-protection explosion-proof power distribution device includes a power distribution cabinet 1 and a back panel 2 installed inside the power distribution cabinet 1, and also includes: The inflatable protection unit 3 is arranged on the side wall of the back plate 2 and is connected to the inside of the power distribution cabinet 1. The inflatable protection unit 3 is filled with helium. The inflatable protection unit 3 includes a helium storage tank 31 fixedly installed on the side wall of the back plate 2. A ventilation pipe 32 is fixedly plugged on one side of the top of the helium storage tank 31. A first manual valve 33 is installed inside the ventilation pipe 32. The ventilation pipe 32 is fixedly connected to an outlet pipe 34, and the side wall of the outlet pipe 34 is fixedly connected to an inflation pipe 35. A sealing cover 36 is fixedly installed on the back of the power distribution cabinet 1, and the sealing cover 36 is connected to the inflation pipe 35. 5 is connected, an air inlet pipe 37 connected to the sealing cover 36 is fixedly plugged on the back of the power distribution cabinet 1, a first electric-controlled valve 38 is installed inside the air inlet pipe 37, a second electric-controlled valve 39 is fixedly installed inside the charging pipe 35, a third electric-controlled valve 310 is installed at a position above the charging pipe 35 inside the air outlet pipe 34, the first electric-controlled valve 38, the second electric-controlled valve 39 and the third electric-controlled valve 310 are all electrically connected to the control main board 8, and the helium storage tank 31 has a total of two can-shaped containers, which are connected by a pipeline for storing helium.

[0020] The air pressure regulating unit 4 is arranged on the top of the power distribution cabinet 1 and is connected with the inside of the power distribution cabinet 1. The air pressure regulating unit 4 includes a barrel 41 installed on the top of the power distribution cabinet 1. A round hole 42 connected with the barrel 41 is opened on the top of the power distribution cabinet 1. An upper piston 43 is slidably arranged inside the barrel 41. An insulating column 44 is fixedly installed on the top of the upper piston 43, and a resistance rod 45 is fixedly installed on the top of the insulating column 44. An insulating sleeve 46 is fixedly installed on the inner wall of the barrel 41, and a supporting spring 47 is fixedly arranged between the insulating sleeve 46 and the upper piston 43. The insulating sleeve 46 A conductive ring 48 matching the resistance rod 45 is fixedly installed inside, and the conductive ring 48 is coaxial with the resistance rod 45. An electromagnetic switch 49 electrically connected to the conductive ring 48 and the resistance rod 45 is fixedly installed inside the barrel 41, and the electromagnetic switch 49 is electrically connected to the control main board 8. The electromagnetic switch 49 is electrically connected to the first electrically controlled valve 38, the second electrically controlled valve 39 and the third electrically controlled valve 310 through the control main board 8. After the conductive ring 48 contacts the resistance rod 45, the moving contact of the electromagnetic switch 49 can be magnetically closed, thereby transmitting a closing electrical signal to the control main board 8.

[0021] Two step-down units 5 are arranged at the bottom of the distribution cabinet 1 and are connected to the inside of the distribution cabinet 1. The two step-down units 5 include an underground magnetic isolation cylinder 51 fixedly installed at the bottom of the distribution cabinet 1. The bottom of the distribution cabinet 1 is provided with a pressure relief hole 52 connected to the buried magnetic isolation cylinder 51. A lower piston 53 is slidably arranged inside the buried magnetic isolation cylinder 51, and an iron rod 54 is fixedly installed at the bottom of the lower piston 53. A reset spring 55 is fixedly arranged between the lower piston 53 and the inner wall of the buried magnetic isolation cylinder 51. An electromagnetic component 56 is fixedly installed on the inner bottom of the cylinder 51. The electromagnetic component 56 is electrically connected to the conductive ring 48 and the resistor rod 45 through the control main board 8. A plurality of air holes 57 are provided at the lower end of the side wall of the buried magnetic isolation cylinder 51. When the electromagnetic component 56 is energized, it can generate a magnetic attraction to attract the iron rod 54 to move downward. The air holes 57 can prevent the lower piston 53 from being blocked by the air inside the buried magnetic isolation cylinder 51 when moving downward. A one-way valve is installed in the air hole 57 to prevent external water and the like from flowing into the buried magnetic isolation cylinder 51.

[0022] The heat dissipation unit 6 is arranged inside the power distribution cabinet 1. A circulating air supply mechanism 7 is installed on the back of the power distribution cabinet 1. The heat dissipation unit 6 is connected to the circulating air supply mechanism 7, and the heat dissipation unit 6 is connected to the gas charging protection unit 3. The heat dissipation unit 6 includes a heat-conducting square cover 61 arranged above two buried magnetic isolation cylinders 51, and the two heat-conducting square covers 61 are fixedly connected to the inner wall of the power distribution cabinet 1. The outer side walls of the two buried magnetic isolation cylinders 51 are fixedly sleeved with a heat-conducting annular cover 62, and the two heat-conducting annular covers 62 are connected to the same side of the heat-conducting annular cover 62. The heat square covers 61 are commonly fixedly connected with a connecting pipe 63, the inner bottom of the distribution cabinet 1 is fixedly installed with a mounting cover 64, and the control main board 8 is fixedly arranged inside the mounting cover 64, the tops of the two heat-conducting annular covers 62 are fixedly plugged with return pipes 65, and the two return pipes 65 are connected to the mounting covers 64, the mounting covers 64 and the helium storage tank 31 are commonly connected with a return flow detection component 66, and the heat-conducting annular cover 62 is in contact with the soil below the ground, and can conduct and dissipate heat to the surrounding soil.

[0023] The backflow detection component 66 includes a detection tube 661 fixedly plugged into the lower back side of the distribution cabinet 1, and a gas flow meter 662 is installed inside the detection tube 661, the detection tube 661 is connected to the installation cover 64, the gas flow meter 662 is electrically connected to the control main board 8, and the control main board 8 transmits the flow data monitored by the gas flow meter 662 to the terminal computer, and a tail pipe 663 connected to the detection tube 661 is fixedly plugged into the lower end of the side wall of the helium storage tank 31, and a second manual valve 664 and a check valve 665 are installed inside the tail pipe 663. The check valve 665 can prevent the helium inside the helium storage tank 31 from flowing back.

[0024] The control main board 8 is arranged inside the power distribution cabinet 1. The inflation protection unit 3, the air pressure regulating unit 4, the pressure reducing unit 5 and the circulating air supply mechanism 7 are all electrically connected to the control main board 8. The circulating air supply mechanism 7 includes a fixed cover 71 fixedly installed on the outer wall of the sealing cover 36. A piston pump 72 is arranged inside the fixed cover 71, and the piston pump 72 is fixedly connected to the outer wall of the sealing cover 36. The air outlet end of the piston pump 72 is connected to the inside of the sealing cover 36. Two heat dissipation pipes 73 are fixedly plugged into the back of the power distribution cabinet 1, and the two heat-conducting square covers 61 are connected to the inside of the sealing cover 36 through the heat dissipation pipes 73 on the same side. The air outlet pipe 34 is connected to the air intake end of the piston pump 72 through the fixed cover 71. The power distribution cabinet 1 and the air outlet pipe 34 are jointly installed with a back-drawing component 74. The piston pump 72 drives the piston to move back and forth through a motor, can transport helium, and can transport the helium back pressure to the inside of the helium storage tank 31. This is an existing mature technology, so it will not be repeated here.

[0025] The withdrawal assembly 74 includes a withdrawal pipe 741 fixedly plugged into the back of the distribution cabinet 1, and the end of the withdrawal pipe 741 away from the distribution cabinet 1 passes through the side wall of the sealing cover 36 and is connected to the air outlet pipe 34. A fourth electrically-controlled valve 742 is installed inside the withdrawal pipe 741. A supplementary hole 743 is provided on the side wall of the distribution cabinet 1, and a fifth electrically-controlled valve 744 is installed inside the supplementary hole 743. An exhaust hole 745 is provided on the top of the sealing cover 36, and a sixth electrically-controlled valve 746 is installed inside the exhaust hole 745. The fourth electrically-controlled valve 742, the fifth electrically-controlled valve 744 and the sixth electrically-controlled valve 746 are all electrically connected to the control main board 8. The supplementary hole 743 is mainly used to replenish external air into the distribution cabinet 1 after the helium is withdrawn into the helium storage tank 31. When the fifth electrically-controlled valve 744 is working, the power distribution system inside the distribution cabinet 1 will not work.

[0026] The operating principle of the present invention is now described as follows: before installing the power distribution cabinet 1, a pit (with a depth of 1.5 meters) matching the heat-conducting annular cover 62 is dug at the installation position, and then two buried magnetic isolation cylinders 51 are pre-buried inside the pit. Subsequently, the power distribution cabinet 1 is installed and fixed on the two buried magnetic isolation cylinders 51 (the bottom of the power distribution cabinet 1 is in contact with the ground at the same time), and then the various distribution units inside the power distribution cabinet 1 are connected to the various power systems, and the input end of the power distribution cabinet 1 is connected to the power supply line. Before using the power distribution cabinet 1, the cabinet door of the power distribution cabinet 1 is closed (a sealing structure such as a sealing strip is provided between the cabinet door and the cabinet body of the power distribution cabinet 1 to ensure the sealing between the cabinet door and the cabinet body), and then the control mainboard 8 is started, and the first manual valve 33 and the second manual valve 664 are opened; After the control main board 8 is started, it will immediately control the piston pump 72 to work, and at the same time control the fourth electrically controlled valve 742 inside the back-drawing pipe 741 to be energized and opened, and control the sixth electrically controlled valve 746 inside the exhaust hole 745 to be energized and opened. At this time, the suction end of the piston pump 72 will extract the air inside the power distribution cabinet 1 through the back-drawing pipe 741, the air outlet pipe 34 and the fixed cover 71, and discharge the air to the outside through the sealing cover 36 and the exhaust hole 745. After the piston pump 72 has been working for 2 minutes, the air inside the power distribution cabinet 1 is basically extracted, and then the control main board 8 controls the piston pump 72 to stop working, and controls the fourth electrically controlled valve 742 and the sixth electrically controlled valve 746 to be powered off and closed, and the second electrically controlled valve 39 inside the inflation pipe 35 and the first electrically controlled valve 38 inside the intake pipe 37 are energized and opened. At this time, the high-pressure helium inside the helium storage tank 31 will pass through the ventilation pipe 32, the air outlet pipe 34, the inflation pipe 35, the sealing cover 36 and the intake pipe 37 enters the inside of the power distribution cabinet 1. After the first electric control valve 38 and the second electric control valve 39 work for 1 minute, the control main board 8 controls the first electric control valve 38 and the second electric control valve 39 to shut down. At this time, since the helium in the helium storage tank 31 enters the inside of the power distribution cabinet 1, the helium can be used to perform explosion-proof protection on the power distribution system inside the power distribution cabinet 1 (helium can effectively reduce the oxygen content in the power distribution cabinet 1, prevent the combustible material from fully contacting with oxygen to cause a violent oxidation reaction, thereby reducing the risk of combustion and explosion, and can cool and isolate the arc, making it difficult for the arc to continue to maintain a high-temperature combustion state, reducing the possibility of causing an explosion of the surrounding combustible material), and under the action of the helium filled into the inside of the power distribution cabinet 1, the upper piston 43 moves up a certain height, so that the conductive ring 48 contacts the resistor rod 45, so that the moving contact of the electromagnetic switch 49 is magnetically closed, and the control main board 8 receives the closing electrical signal of the electromagnetic switch 49; After the control main board 8 receives the closing electrical signal of the electromagnetic switch 49, the control main board 8 will control the piston pump 72 to work again, and connect the power supply circuit of the piston pump 72 with the connection circuit of the conductive ring 48 and the resistor rod 45, and at the same time control the third electric control valve 310 inside the outlet pipe 34 to be energized and opened. At this time, the piston pump 72 will extract the remaining helium inside the helium storage tank 31 through the ventilation pipe 32, the outlet pipe 34 and the fixed cover 71, and transport the helium to the inside of the two heat-conducting square covers 61 through the sealing cover 36 and the two heat dissipation pipes 73. When the helium passes through the inside of the heat-conducting square cover 61, it will bring the heat of the heat-conducting square cover 61 to the inside of the heat-conducting square cover 61. The heat inside the power distribution cabinet 1 will be transferred to the inside of the heat-conducting square cover 61. The inside of the power distribution cabinet 1 can be cooled by the continuous flow of helium. The helium flowing through the heat-conducting square cover 61 will enter the inside of the heat-conducting annular cover 62 through the connecting pipe 63. The heat-conducting annular cover 62 will exchange the heat in the helium and dissipate it to the surrounding soil. The heat will be dissipated through the soil, thereby ensuring the continuous heat dissipation ability of the helium to the inside of the power distribution cabinet 1. The helium passing through the heat-conducting annular cover 62 will enter the inside of the installation cover 64 through the reflux pipe 65, and reflux to the inside of the helium storage tank 31 through the detection tube 661 and the tail pipe 663. During the operation of the power distribution cabinet 1, if the power distribution system inside the power distribution cabinet 1 distributes a large amount of power (for example, power is distributed to multiple power systems such as the ventilation system, lighting system, and monitoring system at the same time), the heat generated by the power distribution system of the power distribution cabinet 1 increases. Under the action of thermal expansion, the helium pressure inside the power distribution cabinet 1 will increase. At this time, under the action of the increased air pressure, the upper piston 43 will continue to be pushed up. At this time, the upper piston 43 will drive the resistance rod 45 to continue to move up. At this time, the contact position of the conductive ring 48 on the resistance rod 45 moves downward relatively, so that the resistance rod 45 will be connected to the connection circuit between the conductive ring 48 and the piston pump 72. As well as the length of the resistor rod 45 connected to the connection loop between the conductive ring 48 and the electromagnetic member 56 becomes shorter, the current passing through the piston pump 72 and the electromagnetic member 56 becomes larger, and the output power of the piston pump 72 increases, so the circulation flow speed of the helium will increase, thereby improving the heat dissipation efficiency of the helium to the inside of the power distribution cabinet 1. At the same time, after the current of the electromagnetic member 56 becomes larger, the magnetic attraction generated by it becomes larger synchronously. At this time, the distance that the iron rod 54 is attracted to move downward becomes larger, thereby increasing the downward movement distance of the two lower pistons 53, and further increasing the space connecting the lower piston 53 with the power distribution cabinet 1. By increasing the space for accommodating helium, The helium pressure inside the distribution cabinet 1 is reduced, so that the stability of the helium pressure inside the distribution cabinet 1 can be maintained as much as possible. Secondly, if a leak occurs in the sealing structure between the cabinet body and the cabinet door of the distribution cabinet 1, at this time, since the helium pressure inside the distribution cabinet 1 is higher than the external air pressure, the helium inside the distribution cabinet 1 will escape to the outside through the leak, which will cause the air pressure inside the distribution cabinet 1 to decrease. Therefore, under the action of the support spring 47, the conductive ring 48 will separate from the resistor rod 45. At this time, the connection circuit of the electromagnetic switch 49 is disconnected, so the control main board 8 cannot receive the closing electrical signal of the electromagnetic switch 49. At this time, the control main board 8 The piston pump 72 will be controlled to stop working, and the second electric control valve 39 in the gas charging pipe 35 and the first electric control valve 38 in the gas inlet pipe 37 will be powered on and opened. At this time, the remaining high-pressure helium in the helium storage tank 31 will continue to be replenished into the power distribution cabinet 1, so that when the seal failure occurs at the door of the power distribution cabinet 1, the air pressure inside the power distribution cabinet 1 can continue to be kept stable for a certain period of time. When the control main board 8 cannot receive the closing electrical signal of the electromagnetic switch 49, the control main board 8 will send a prompt message to the computer at the remote terminal through its own communication module to remind the personnel to repair the power distribution cabinet 1 in time. At the same time, if the power distribution cabinet 1 still explodes during use (for example, when a leak occurs on the door of the power distribution cabinet 1, and the relevant personnel fail to repair the power distribution cabinet 1 in time), the explosion will cause the pressure inside the power distribution cabinet 1 to increase suddenly. Under the action of the suddenly increased air pressure, the two lower pistons 53 will be squeezed and pushed downward, so that the suddenly increased explosion pressure has a certain pressure relief space, reducing the pressure of the explosion on the cabinet body and the door of the power distribution cabinet 1, thereby helping to improve the explosion-proof effect; When the temperature inside the power distribution cabinet 1 rises, the output power of the piston pump 72 increases, and the flow rate of the helium used for heat dissipation increases. At this time, in the same time, the flow of helium flowing through the detection tube 661 increases, so the metering data of the gas flow meter 662 will also increase synchronously, and the control mainboard 8 sends the metering data of the gas flow meter 662 to the computer of the remote terminal. Relevant personnel can check the metering data of the gas flow meter 662 through the terminal computer to determine whether the power distribution cabinet 1 needs to be maintained and repaired (after the power distribution cabinet 1 has been used for a period of time, in order to ensure the stability of the power distribution system, the power distribution system needs to be maintained and repaired. When the power of the power distribution system is large, due to the increase in temperature, the wires and terminal blocks of the power distribution system may become loose due to temperature changes and other reasons. Therefore, by increasing the metering data of the gas flow meter 662 when the temperature inside the power distribution cabinet 1 rises, personnel can be reminded in time); When personnel need to open the power distribution cabinet 1, they first shut down the power distribution cabinet 1 (the controller installed on the cabinet door of the power distribution cabinet 1 can shut down the power distribution cabinet 1, and the control main board 8 will receive the shutdown signal of the shutdown button of the power distribution cabinet 1), and the control main board 8 will control the piston pump 72 to disconnect the connection circuit with the conductive ring 48 and the resistor rod 45, and control the power supply circuit of the piston pump 72 to supply power to the piston pump 72 alone, so that the output power of the piston pump 72 remains stable, and at the same time control the fourth electric control valve 742 inside the back-drawing pipe 741 to be energized. At this time, the back-drawing pump can extract the helium inside the power distribution cabinet 1 through the back-drawing pipe 741, the air outlet pipe 34, and the fixed cover 71, and through the sealing cover 36, the heat dissipation Tube 73, heat-conducting square cover 61, heat-conducting annular cover 62, connecting pipe 63, reflux pipe 65, installation cover 64, detection tube 661 and tail pipe 663, re-pressurize the helium and transport it to the inside of helium storage tank 31. After the piston pump 72 works for 2 minutes and 30 seconds, the control motherboard 8 controls the piston pump 72 to stop working, and controls the fifth electric control valve 744 inside the two replenishing holes 743 to be energized to work, and the external air is re-supplied into the distribution cabinet 1. Since the distribution cabinet 1 has stopped working at this time, the distribution system of the distribution cabinet 1 will not explode after contacting with the external air. Then the relevant personnel will open the door of the distribution cabinet 1 and inspect and maintain the distribution system inside the distribution cabinet 1.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-protection explosion-proof power distribution device, comprising a power distribution cabinet (1) and a back plate (2) installed inside the power distribution cabinet (1), characterized in that: Also includes: An inflatable protection unit (3) is arranged on a side wall of the back plate (2) and is connected to the interior of the power distribution cabinet (1); the inflatable protection unit (3) is filled with helium; An air pressure control unit (4) is arranged on the top of the power distribution cabinet (1) and is connected to the interior of the power distribution cabinet (1); Two voltage reduction units (5) are arranged at the bottom of the power distribution cabinet (1) and are connected to the interior of the power distribution cabinet (1); A heat dissipation unit (6) is arranged inside the power distribution cabinet (1); a circulating air supply mechanism (7) is installed on the back of the power distribution cabinet (1); the heat dissipation unit (6) is connected to the circulating air supply mechanism (7), and the heat dissipation unit (6) is connected to the inflation protection unit (3); A control main board (8) is arranged inside the power distribution cabinet (1); the inflation protection unit (3), the air pressure control unit (4), the pressure reduction unit (5) and the circulating air supply mechanism (7) are all electrically connected to the control main board (8).

2. A high protection explosion-proof power distribution device according to claim 1, characterized in that: The inflatable protection unit (3) comprises a helium storage tank (31) fixedly mounted on the side wall of the back plate (2); a ventilation pipe (32) is fixedly plugged into one side of the top of the helium storage tank (31); a first manual valve (33) is installed inside the ventilation pipe (32); the ventilation pipe (32) is fixedly connected to an outlet pipe (34); and a side wall of the outlet pipe (34) is fixedly connected to an inflation pipe (35); a sealing cover (36) is fixedly mounted on the back of the power distribution cabinet (1); and the sealing cover (36) is connected to the inflation pipe (35). The back of the power distribution cabinet (1) is fixedly connected with an air inlet pipe (37) which is connected to the sealing cover (36); a first electrically controlled valve (38) is installed inside the air inlet pipe (37); a second electrically controlled valve (39) is fixedly installed inside the inflation pipe (35); a third electrically controlled valve (310) is installed inside the air outlet pipe (34) at a position above the inflation pipe (35); and the first electrically controlled valve (38), the second electrically controlled valve (39) and the third electrically controlled valve (310) are all electrically connected to the control main board (8).

3. A high protection explosion-proof power distribution device according to claim 2, characterized in that: The air pressure control unit (4) comprises a barrel (41) mounted on the top of a power distribution cabinet (1); a round hole (42) communicating with the barrel (41) is provided on the top of the power distribution cabinet (1); an upper piston (43) is slidably provided inside the barrel (41); an insulating column (44) is fixedly mounted on the top of the upper piston (43); a resistance rod (45) is fixedly mounted on the top of the insulating column (44); an insulating sleeve (46) is fixedly mounted on the inner wall of the barrel (41); and a support member (46) is fixedly mounted between the insulating sleeve (46) and the upper piston (43). A spring (47), a conductive ring (48) matching the resistance rod (45) is fixedly installed inside the insulating sleeve (46), and the conductive ring (48) is coaxial with the resistance rod (45), an electromagnetic switch (49) electrically connected to the conductive ring (48) and the resistance rod (45) is fixedly installed inside the barrel (41), and the electromagnetic switch (49) is electrically connected to the control mainboard (8), and the electromagnetic switch (49) is electrically connected to the first electrically controlled valve (38), the second electrically controlled valve (39) and the third electrically controlled valve (310) through the control mainboard (8).

4. A high protection explosion-proof power distribution device according to claim 3, characterized in that: The two step-down units (5) each comprise an underground magnetic isolation cylinder (51) fixedly mounted on the bottom of the power distribution cabinet (1); a pressure relief hole (52) connected to the underground magnetic isolation cylinder (51) is provided at the bottom of the power distribution cabinet (1); a lower piston (53) is slidably provided inside the buried magnetic isolation cylinder (51); an iron rod (54) is fixedly mounted at the bottom of the lower piston (53); a return spring (55) is fixedly mounted between the lower piston (53) and the inner wall of the buried magnetic isolation cylinder (51); an electromagnetic component (56) is fixedly mounted on the inner bottom of the buried magnetic isolation cylinder (51); the electromagnetic component (56) is electrically connected to the conductive ring (48) and the resistor rod (45) through the control main board (8); and a plurality of air holes (57) are provided at the lower end of the side wall of the buried magnetic isolation cylinder (51).

5. A high protection explosion-proof power distribution device according to claim 4, characterized in that: The heat dissipation unit (6) comprises a heat-conducting square cover (61) arranged above two buried magnetic isolation cylinders (51), and the two heat-conducting square covers (61) are fixedly connected to the inner wall of the power distribution cabinet (1), the outer walls of the two buried magnetic isolation cylinders (51) are fixedly sleeved with a heat-conducting annular cover (62), and the two heat-conducting annular covers (62) and the heat-conducting square covers (61) on the same side are commonly fixedly connected with a connecting pipe (63), the inner bottom of the power distribution cabinet (1) is fixedly installed with a mounting cover (64), and the control main board (8) is fixedly arranged inside the mounting cover (64), the tops of the two heat-conducting annular covers (62) are fixedly plugged with return pipes (65), and the two return pipes (65) are connected to the mounting cover (64), and the mounting cover (64) and the helium storage tank (31) are commonly connected with a return flow detection component (66).

6. A high protection explosion-proof power distribution device according to claim 5, characterized in that: The circulating air supply mechanism (7) comprises a fixed cover (71) fixedly mounted on the outer wall of the sealing cover (36); a piston pump (72) is arranged inside the fixed cover (71), and the piston pump (72) is fixedly connected to the outer wall of the sealing cover (36); an air outlet end of the piston pump (72) is connected to the inside of the sealing cover (36); two heat dissipation pipes (73) are fixedly plugged into the back of the power distribution cabinet (1), and the two heat-conducting square covers (61) are connected to the inside of the sealing cover (36) through the heat dissipation pipes (73) on the same side; the air outlet pipe (34) is connected to the air intake end of the piston pump (72) through the fixed cover (71); and a retraction assembly (74) is installed on the power distribution cabinet (1) and the air outlet pipe (34).

7. A high protection explosion-proof power distribution device according to claim 5, characterized in that: The backflow detection assembly (66) comprises a detection tube (661) fixedly plugged into the lower back side of the power distribution cabinet (1), and a gas flow meter (662) is installed inside the detection tube (661), the detection tube (661) is connected to the installation cover (64), the gas flow meter (662) is electrically connected to the control main board (8), and the control main board (8) transmits flow data monitored by the gas flow meter (662) to the terminal computer, and a tail pipe (663) connected to the detection tube (661) is fixedly plugged into the lower end of the side wall of the helium storage tank (31), and a second manual valve (664) and a check valve (665) are installed inside the tail pipe (663).

8. A high protection explosion-proof power distribution device according to claim 6, characterized in that: The retraction assembly (74) comprises a retraction pipe (741) fixedly plugged into the back of the power distribution cabinet (1), and the end of the retraction pipe (741) away from the power distribution cabinet (1) passes through the side wall of the sealing cover (36) and is connected to the air outlet pipe (34), a fourth electric control valve (742) is installed inside the retraction pipe (741), a supplementary hole (743) is opened on the side wall of the power distribution cabinet (1), and a fifth electric control valve (744) is installed inside the supplementary hole (743), an exhaust hole (745) is opened on the top of the sealing cover (36), and a sixth electric control valve (746) is installed inside the exhaust hole (745), and the fourth electric control valve (742), the fifth electric control valve (744) and the sixth electric control valve (746) are all electrically connected to the control main board (8).

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