Distribution box line protection device facilitating later maintenance and fire protection method

Abstract

The invention provides a power distribution box line protection device facilitating later maintenance and a fire protection method, and relates to the technical field of power distribution boxes. The power distribution box line protection device comprises a power distribution box body, a protection gate plate, a lifting assembly and a fireproof bag assembly; a wiring board is arranged in the distribution box body; heat dissipation windows are arranged on two side plates and a back plate of the power distribution box body; the protective flashboard is arranged on the outer side of the power distribution box body in a lifting manner; the wiring plate is supported on a rotary hanging plate in the distribution box body through a fixed hanging plate; the fireproof bag assembly comprises a lifting frame body and a fireproof bag, and the lifting assembly comprises a lifting driving mechanism and two vertically-arranged lifting screws. The power distribution box line protection device has the beneficial effects that the power distribution box line protection device can close the heat dissipation window of the power distribution box through the protection gate plate in the first time after a fire occurs, meanwhile, the fireproof bag can be used for isolating a fire component, and the fire component is subjected to closed and buried fire extinguishment in combination with the jet fire extinguisher, so that the fire extinguishment success rate is increased, and the fire time is shortened; the fire loss is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution boxes, and in particular to a line protection device and a fire protection method for a distribution box that are conducive to later maintenance. Background Art

[0002] As a core device for power distribution and control, distribution boxes are widely used in industrial, commercial, and residential fields. Components (such as circuit breakers, fuses, relays, etc.) and a large number of connecting lines are provided inside the distribution box. When the internal components work, heat is generated. Therefore, distribution boxes usually need to be provided with heat dissipation windows to discharge the heat inside. Distribution boxes are usually installed in distribution rooms, and multiple distribution boxes for power distribution in different areas are usually installed in the distribution room. During the long-term operation of the distribution box, due to problems such as wire aging, short circuit, or overload, there is an easy risk of fire.

[0003] Patent document CN201310467823.0 discloses a highly flame-retardant and fireproof heat dissipation distribution box. When a fire occurs, carbon dioxide is directly injected into the interior of the distribution box, directly cutting off the burning environment of the fire, ensuring that the volume or concentration of carbon dioxide in the inner box body cannot burn. At the same time, there is a serpentine tube in the intermediate space between the outer shell and the inner box body. The outer connection of the serpentine tube is a compressor. By using the operation of the compressor, the temperature in the intermediate space between the outer shell and the inner box body is reduced, achieving the purpose of quickly extinguishing the fire.

[0004] The technical solution of the above patent document cannot seal the heat dissipation window of the distribution box, and it cannot solve the problem that the flame and temperature spread to the outside through the heat dissipation window when the distribution box catches fire. When a fire occurs inside one distribution box in the distribution room, the flame or high temperature is likely to quickly spread to the remaining power distribution equipment in the distribution room through the heat dissipation window, which will cause the fire in the distribution room to be difficult to control, resulting in huge fire losses and affecting the regional power supply; moreover, when a fire occurs outside the distribution box, it is usually necessary to cut off the power of all distribution boxes, resulting in the impact on the distribution boxes in the entire area.

[0005] In addition, the electrical components and connecting lines of the existing distribution boxes are all specified inside the distribution box. When the distribution box is maintained later, a large number of components often need to be disassembled, increasing the maintenance difficulty and time cost.

[0006] Therefore, there is an urgent need for a line protection device for a distribution box that can effectively prevent fire and is convenient for later maintenance to improve the safety and maintainability of the distribution box. Summary of the Invention

[0007] In view of this, the present invention provides a line protection device for a distribution box that facilitates later maintenance. The line protection device for the distribution box of the present invention can isolate the distribution box at the first time after a fire occurs inside the distribution box, and at the same time, can use a fireproof bag to isolate the fire-starting component, and combine with a spraying fire extinguisher to carry out a closed burial type fire extinguishing on the fire-starting component, so as to avoid affecting external power distribution equipment; at the same time, when a fire occurs outside the distribution box, quickly isolate the distribution box, so that the distribution box that has not caught fire can work normally without being affected by the fire, thereby comprehensively reducing the impact of the fire in the distribution room on the regional power supply.

[0008] The present invention provides a line protection device for a distribution box that facilitates later maintenance, including a distribution box body, a protection shutter, a lifting assembly, and a fireproof bag assembly; A wiring board is provided inside the distribution box body; Heat dissipation windows are provided on both side plates and the back plate of the distribution box body. The protection shutter is arranged on the outside of the distribution box body in a liftable manner. A shutter trigger assembly is also provided on the distribution box body, and the top of the protection shutter is fixed to the shutter trigger assembly; Rotating hanging plates are provided on the inner walls of both side plates of the distribution box body. Fixed hanging plates are provided on both sides of the wiring board, and the fixed hanging plates are supported on the two rotating hanging plates; The fireproof bag assembly includes a lifting frame and a fireproof bag. The upper end of the fireproof bag is open and the bottom is closed. The open end of the fireproof bag is fixed to the lifting frame, and threaded sleeves are fixedly provided on both sides of the lifting frame; The lifting assembly includes a lifting drive mechanism and two vertically arranged lifting screw rods. The lifting drive mechanism is connected to the two lifting screw rods. The two lifting screw rods respectively pass through the two threaded sleeves. The lifting drive mechanism drives the lifting screw rods to rotate, driving the lifting frame to rise to touch the shutter trigger assembly to make the protection shutter descend to close all the heat dissipation windows, and make the fireproof bag cover the wiring board.

[0009] Further, fixing holes are provided on the inner wall of the protection shutter. The shutter trigger assembly includes a shutter fixing module, a trigger module, and a rotating connecting rod. The middle of the rotating connecting rod is rotatably connected to the inner wall of the distribution box body; The shutter fixing module includes a fixing sleeve body and a fixing slider. The fixing sleeve body is fixed to the side plate of the distribution box body. The fixing slider is slidably arranged in the fixing sleeve body. Plug pins and release pull rods are respectively provided at both ends of the fixing slider. The plug pin is inserted into the fixing hole, and the release pull rod is rotatably connected to the upper end of the rotating connecting rod; The trigger module includes a trigger seat and a trigger convex block. A sliding trigger hole is provided on the trigger seat, and the trigger convex block is slidably arranged in the sliding trigger hole. The tail of the trigger convex block is rotatably connected to the lower end of the rotating connecting rod.

[0010] Further, the gate trigger assembly further includes a first elastic member and a second elastic member. Two ends of the first elastic member respectively abut against the tail of the trigger bump and the trigger seat, and the second elastic member respectively abuts against the bottom of the fixed sleeve and the bottom of the fixed slider.

[0011] Further, a fixed support plate is also externally provided on the distribution box body, and the fixed support plate is used to support the lowered protective gate.

[0012] Further, the lifting drive mechanism includes a drive motor, two synchronous belt pulleys and two synchronous transmission belts. The two synchronous belt pulleys are respectively fixed to the upper ends of the lifting screws, and the synchronous transmission belts connect the two synchronous belt pulleys; The drive motor is fixedly arranged on the top of the distribution box body, and the output shaft of the drive motor is connected to one of the lifting screws.

[0013] Further, a jet fire extinguisher is also included. The jet fire extinguisher includes a fire extinguishing cylinder, a jet pump and a jet pipe. The fire extinguishing cylinder is fixed on the top of the distribution box body. The fire extinguishing cylinder is connected to the jet pipe through a connecting hose. The jet pump is arranged on the connecting hose. The jet pipe is fixed directly above the wiring board, and a plurality of jet ports are arranged at the bottom of the jet pipe.

[0014] Further, a rotating mounting seat is provided on the inner wall of the distribution box body. A limiting support plate is provided at the bottom of the rotating mounting seat. The rotating hanging plate is rotatably connected to the rotating mounting seat through a hinge rod. An inclined groove is provided at the end of the rotating hanging plate. The fixed hanging plate is limited and supported in the inclined groove.

[0015] Further, a sensor assembly and a fire protection controller are also included. The sensor assembly includes a mounting shell, an internal temperature sensor and an external temperature sensor. The mounting shell is embedded in the inner wall of the side plate of the distribution box body. A heat insulation plate is provided inside the mounting shell. The heat insulation plate divides the internal cavity of the mounting shell into an inner cavity and an outer cavity. The internal temperature sensor and the external temperature sensor are respectively fixed in the inner cavity and the outer cavity. Both the internal temperature sensor and the external temperature sensor are connected to the fire protection controller, and the fire protection controller is connected to the drive motor and the jet pump.

[0016] The present invention also provides a fire protection method for a distribution box line protection device conducive to later maintenance. The fire protection method is for the above-mentioned distribution box line protection device, and the protection method includes the following steps: S1: Sense the fire condition of the distribution box through the temperature sensor. The fire condition includes no fire, fire occurring outside the distribution box, and fire occurring inside the distribution box; If there is no fire, maintain the original state; If a fire breaks out outside the distribution box, step S2 is executed; If a fire breaks out inside the distribution box, steps S2 and S3 are executed in sequence; S2: The lifting drive mechanism drives the threaded sleeve to rise a certain distance to trigger the shutter trigger assembly, causing the protective shutter to fall and close all heat dissipation windows; S3: The lifting drive mechanism drives the threaded sleeve to continue rising, causing the threaded sleeve to drive the lifting frame and the fireproof bag to move upward. During the upward movement of the lifting frame, the rotating hanging plate is driven to rotate, releasing the support of the rotating hanging plate on the fixed hanging plate, causing the wiring board to fall into the fireproof bag.

[0017] Furthermore, step S31 is also included in step S3. Step S31 is executed after the wiring board falls into the fireproof bag; S31: The fire extinguisher sprays fire extinguishing materials into the upper opening of the fireproof bag from above, so that the sprayed fire extinguishing materials cover the upper end of the wiring board.

[0018] The beneficial effects of a line protection device and a fire protection method for a distribution box that are conducive to later maintenance according to the present invention are as follows: (1) When a fire breaks out inside the distribution box, the lifting drive mechanism of the distribution box line protection device can drive the two lifting screws to be connected. The two lifting screws respectively pass through the two threaded sleeves. The lifting drive mechanism drives the lifting screws to rotate, driving the threaded sleeve and the lifting frame to rise. During the upward movement of the threaded sleeve, its support on the protective shutter can be released by touching the shutter trigger assembly, causing the protective shutter to descend and close all heat dissipation windows, so as to isolate the distribution boxes in the distribution room from each other and prevent the fire of the distribution box from spreading to the other distribution boxes; at the same time, when the lifting frame rises, the wiring board can be automatically wrapped by the fireproof bag, enclosing the burning wiring board to form an isolation layer. At the same time, the fire extinguisher on the top of the wiring board can spray fire extinguishing materials into the fireproof bag from the inside. The fire extinguishing materials can cover the wiring board in the fireproof bag as a whole, ensuring that the components and connecting lines of the wiring board on fire can be extinguished efficiently and accurately, improving the fire extinguishing success rate, effectively limiting the scope of the fire, reducing the fire loss. At the same time, when a fire breaks out outside the distribution box, the non - burning distribution box only releases the protective shutter to isolate the distribution box, ensuring that the non - burning distribution boxes in the distribution room can work normally and reducing the impact of the fire in the distribution room on the regional power supply.

[0019] (2) The components and connecting wires inside the line protection device of the distribution box are installed on a wiring board. The wiring board is supported by a rotating hanging plate on a fixed hanging plate on the wiring board, which can ensure that the wiring board is stably installed inside the distribution box by its own gravity. When the components and connecting wires inside the distribution box need to be repaired, the wiring board and the components and connecting wires installed on the wiring board can be removed as a whole without disassembling the overall structure, which can facilitate the subsequent repair of the distribution box and significantly improve the maintenance efficiency. Moreover, the rotating hanging plate structure of the line protection device of the distribution box can also ensure that the lifting frame can push the rotating hanging plate to rotate relative to the rotating mounting seat during the rising process, releasing the support of the rotating hanging plate on the fixed hanging plate and making the wiring board fall into the fireproof bag. The wiring board and the rotating hanging plate structure of the present invention can not only facilitate the repair of the distribution box but also facilitate the fire isolation of the wiring board.

[0020] (3) The sensor assembly of the line protection device of the distribution box includes an internal temperature sensor and an external temperature sensor, and the sensor assembly can sense the fire occurrence status inside and outside the distribution room. When a fire occurs outside the distribution box, only the protection shutter descends to close the heat dissipation window. When a fire occurs inside the distribution box, the protection shutter closes the heat dissipation window, and at the same time, the fireproof bag rises to isolate the wiring board and extinguish the fire on the wiring board. Description of the Drawings

[0021] Figure 1 is the overall structural schematic diagram of a line protection device for a distribution box that is conducive to later maintenance according to an embodiment of the present invention.

[0022] Figure 2 Side view of a line protection device for a distribution box that is conducive to later maintenance according to an embodiment of the present invention.

[0023] Figure 3 Internal structural schematic diagram of the distribution box body of a line protection device for a distribution box that is conducive to later maintenance according to an embodiment of the present invention (the door structure of the distribution box body is not drawn).

[0024] Figure 4 is Figure 3 The enlarged view of A in

[0025] Figure 5 is Figure 4 The enlarged view of B in

[0026] Figure 6 Internal structure diagram of the fixed sleeve of a line protection device for a distribution box that is conducive to later maintenance according to an embodiment of the present invention.

[0027] Figure 7 Top view of the lifting frame of a line protection device for a distribution box that is conducive to later maintenance according to an embodiment of the present invention.

[0028] Figure 8Schematic diagram of the installation structure of the rotating hanging plate and the fixed hanging plate of a line protection device for a distribution box that facilitates later maintenance according to an embodiment of the present invention.

[0029] Figure 9 Flowchart of a fire protection method for a line protection device of a distribution box that facilitates later maintenance according to an embodiment of the present invention.

[0030] In the above figures: 100 - distribution box body, 101 - heat dissipation window, 102 - fixed support plate, 103 - slide rail plate, 200 - protection shutter, 201 - slide rail groove, 202 - fixed seat; 300 - trigger seat, 301 - trigger projection, 302 - first elastic member, 310 - rotating link, 311 - strip hole, 400 - fixed sleeve, 401 - fixed slider, 402 - release pull rod, 403 - pin rod, 404 - second elastic member, 500 - wiring board, 501 - rotating mounting seat, 502 - limiting support plate, 503 - rotating hanging plate, 504 - fixed hanging plate, 505 - inclined groove, 600 - driving motor, 601 - lifting screw rod, 602 - synchronous pulley, 603 - synchronous drive belt, 700 - fireproof bag, 701 - lifting frame, 702 - threaded sleeve; 800 - fire extinguisher, 801 - spray pipe, 802 - connecting hose, 803 - spray pump, 900 - installation housing, 901 - heat insulation board, 902 - external temperature sensor, 903 - internal temperature sensor. Detailed implementation manners

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0032] Please refer to Figures 1 to 8 , a line protection device for a distribution box that facilitates later maintenance according to the present invention includes a distribution box body 100, a protection shutter 200, a lifting assembly, a fireproof bag assembly, and a spray fire extinguisher; The distribution box body 100 is a rectangular box with an openable door. A wiring board 500 is provided inside the distribution box body 100; Electrical components and connection lines for performing power distribution functions are fixedly installed on the wiring board 500. An inlet and outlet hole is provided in the upper part of the distribution box body 100, and the connection lines enter and exit the distribution box body 100 through the inlet and outlet hole.

[0033] Both side plates and the back plate of the distribution box body 100 are provided with heat dissipation windows 101, and the three heat dissipation windows 101 have the same height. The protective shutter 200 is arranged outside the distribution box body 100 in a liftable manner. A fixed support plate 102 and a slide rail plate 103 are further fixed on the outer wall of the distribution box body 100. The fixed support plate 102 is located below the heat dissipation window 101, and the slide rail plate 103 is vertically fixed on the outer wall of the distribution box body 100. Slide rail grooves 201 are provided at both ends of the protective shutter 200, and the slide rail plate 103 is slidably fitted into the slide rail grooves 201, so that the protective shutter 200 slides up and down along the slide rail plate 103 outside the distribution box body 100. In this embodiment, the protective shutter 200 is a metal plate coated with a fireproof and heat-insulating layer. The protective shutter 200 has good fireproof and heat-insulating performance.

[0034] A shutter trigger assembly is further provided on the distribution box body 100, and the top of the protective shutter 200 is supported on the shutter trigger assembly; when the distribution box body 100 is working normally, the protective shutter 200 is located above the heat dissipation window 101 and does not block the heat dissipation window 101, ensuring the heat dissipation function of the distribution box body 100.

[0035] Rotating hanging plates 503 are provided on the inner walls of both side plates of the distribution box body 100, fixed hanging plates 504 are provided on both sides of the wiring board 500, and the fixed hanging plates 504 are supported on the rotating hanging plates 503; in this way, the wiring board 500 can be stably and low-hangingly fixed in the distribution box body 100.

[0036] Specifically, two rotating mounting seats 501 are provided on both sides of the inner wall of the distribution box body 100, that is, the number of rotating mounting seats 501 is four. A limiting support plate 502 is provided at the bottom of the rotating mounting seat 501. The rotating hanging plate 503 is rotatably connected to the rotating mounting seat 501 through a hinge rod. The limiting support plate 502 is used to support the rotating hanging plate 503 to ensure that the rotating hanging plate 503 can only rotate upward and cannot rotate downward. An inclined groove 505 is provided at the end of the rotating hanging plate 503, and the number of fixed hanging plates 504 is also four. The ends of the fixed hanging plates 504 all have a supporting inclined surface, and the ends of the fixed hanging plates 504 are supported in the inclined groove 505 through the supporting inclined surface. In this way, the wiring board 500 can be suspended in the distribution box by its own gravity. And during the maintenance and repair process of the wiring board 500, the wiring board 500 can be lifted a certain distance and then taken off the rotating hanging plate 503 as a whole, which is convenient for the overall maintenance of the wiring board 500.

[0037] The fireproof bag assembly includes a lifting frame 701 and a fireproof bag 700. The material of the fireproof bag 700 is the same as that of the fire extinguishing blanket (for example, woven from fiberglass material), and it can play a role in isolating heat sources and flames. The upper end of the fireproof bag 700 is open, and the bottom is closed. The open end of the fireproof bag 700 is fixed to the lifting frame 701, and threaded sleeves 702 are fixedly provided on both sides of the lifting frame 701; the lifting frame 701 is of a rectangular frame structure and is located directly below the wiring board 500.

[0038] The lifting assembly includes a lifting drive mechanism and two vertically arranged lifting screw rods 601. The lifting drive mechanism is connected to the two lifting screw rods 601. The two lifting screw rods 601 respectively pass through the two threaded sleeves 702. The lifting drive mechanism is used to drive the two lifting screw rods 601 to rotate synchronously, so as to drive the two threaded sleeves 702 and the lifting frame 701 connected to the threaded sleeves 702 to lift and lower synchronously.

[0039] The fire extinguisher includes a fire extinguishing cylinder 800, a jet pump 803 and a jet pipe 801. The fire extinguishing cylinder 800 is fixed to the top of the distribution box body 100. The fire extinguishing cylinder 800 is connected to the jet pipe 801 through a connecting hose 802. The jet pump 803 is arranged on the connecting hose 802. The jet pipe 801 is fixed directly above the wiring board 500, and a plurality of jet ports are provided at the bottom of the jet pipe 801. The fire extinguishing cylinder 800 stores fire extinguishing materials. The jet pump 803 is used to spray the fire extinguishing materials downward from the jet ports of the jet pipe 801 to extinguish the electrical components and connecting lines on the wiring board 500. The fire extinguishing materials can be dry powder or a mixture of dry powder and carbon dioxide.

[0040] When a fire occurs outside the distribution box, the lifting drive mechanism drives the threaded sleeve 702 to rise. During the rising process of the threaded sleeve 702, the shutter trigger assembly is triggered, and the shutter trigger assembly releases the supporting effect on the protective shutter 200, so that the trigger shutter slides down along the slide rail plate 103 until the lower part of the protective shutter 200 supports on the fixed support plate 102; at this time, the protective shutter 200 completely closes all the heat dissipation windows 101, which can effectively prevent the flames outside the distribution box from extending into the distribution box and ensure the safety of the electrical components and connecting lines inside the distribution box.

[0041] When a fire breaks out inside the distribution box (i.e., the electrical components and connecting lines on the wiring board 500 catch fire), the lifting drive mechanism drives the threaded sleeve 702 and the lifting frame to continue rising to the top of the distribution box. At this time, the lifting frame will drive the fireproof bag 700 to enclose the wiring board 500 and the electrical components and connecting lines fixed thereon into the fireproof bag 700, thus isolating and sealing the fire-starting components in the fireproof bag 700 to prevent the further spread of the flame. At this time, the fire extinguisher starts, including the fire extinguishing pump. The fire extinguishing material stored in the fire extinguishing cylinder 800 can be sprayed from the fire extinguisher on the top of the wiring board 500 into the fireproof bag 700. The fire extinguishing material can completely cover the wiring board 500 in the fireproof bag 700, ensuring that the fire-starting part can be extinguished efficiently and accurately, greatly improving the fire extinguishing success rate, effectively limiting the scope of the fire, and reducing the fire loss. It can be understood that when the external fire is large, resulting in too high a temperature inside the distribution box and causing the electrical components and connecting lines inside the distribution box to malfunction. The above-mentioned fire extinguishing process of the fireproof bag 700 and the fire extinguisher will also be executed, so that the non-fire-starting electrical components and connecting lines can be protected in the fireproof bag 700 to prevent them from being damaged by high temperature.

[0042] It can be understood that during the rising process of the lifting frame 701, the side of the lifting frame 701 can lift the rotating hanging plate 503 upward, causing the rotating hanging plate 503 to rotate upward, thereby releasing the support of the rotating hanging plate 503 on the wiring board 500, ensuring that the rotating hanging plate 503 and the support structure of the rotating hanging plate 503 will not affect the rising of the lifting frame 701, so that the fireproof bag 700 can enclose the wiring board 500 therein (that is, after the lifting frame 701 releases the support of the upper rotating hanging plate 503 on the wiring board 500, the wiring board 500 drops into the fireproof bag 700). It should also be noted that in this embodiment, the widths of the lower rotating hanging plate 503 and the fixed hanging plate 504 are smaller than the widths of the upper rotating hanging plate 503 and the fixed hanging plate 504. This ensures that when the lifting frame 701 releases the support of the lower rotating hanging plate 503 on the wiring board 500, the upper rotating hanging plate 503 will still play a limiting role on the fixed hanging plate 504 to prevent the wiring board 500 from tipping over.

[0043] The distribution box line protection device of the present invention can isolate the distribution box at the first time after a fire occurs. At the same time, it can use the fireproof bag 700 to isolate the fire-starting components (the components and connecting lines on the wiring board 500), and combine with the fire extinguisher to carry out a closed burial type fire extinguishing on the fire-starting components, improving the fire extinguishing success rate and shortening the fire-starting time, and reducing the fire loss. And the wiring board 500 and the structure of the rotating hanging plate 503 of the present invention can not only facilitate the maintenance of the distribution box, but also facilitate the isolation of the wiring board 500 from the fire.

[0044] In a preferred embodiment, a fixed seat 202 is provided on the inner wall of the protective shutter 200, and a fixing hole is provided on the fixed seat 202. The shutter trigger assembly includes a shutter fixing module, a trigger module, and a rotating link 310. The middle of the rotating link 310 is rotatably connected to the inner wall of the distribution box body 100. Specifically, a hinge seat is fixedly provided on the inner wall of the distribution box body 100; the middle of the rotating link 310 is hinged to the hinge seat. The shutter fixing module is fixed to the upper part of the distribution box body 100, and the trigger module is located in the lower part of the distribution box body 100.

[0045] The shutter fixing module includes a fixed sleeve 400 and a fixed slider 401. The fixed sleeve 400 is fixed to the side plate of the distribution box body 100, and the fixed sleeve 400 penetrates through the side plate of the distribution box body 100. The fixed slider 401 is slidably disposed in the fixed sleeve 400. Insert pin rods 403 and a release pull rod 402 are respectively provided at both ends of the fixed slider 401. The insert pin rod 403 is inserted into the fixing hole, so that the protective shutter 200 can be supported on the shutter trigger assembly. The release pull rod 402 is rotatably connected to the upper end of the rotating link 310; The trigger module includes a trigger seat 300 and a trigger convex block 301. A sliding trigger hole is provided on the trigger seat 300, and the trigger convex block 301 is slidably disposed in the sliding trigger hole. The tail of the trigger convex block 301 is rotatably connected to the lower end of the rotating link 310. The outer surface of the trigger convex block 301 is an arc surface. Strip-shaped holes 311 are provided at both the upper and lower ends of the rotating link 310, and sliding hinge rods are provided in the strip-shaped holes. The rotating link 310 is respectively rotatably connected to the release pull rod 402 and the tail of the rotating trigger convex block 301 through two sliding hinge rods.

[0046] When the lifting drive mechanism drives the threaded sleeve 702 to rise a certain distance, the outer wall of the threaded sleeve 702 can squeeze the trigger convex block 301, causing the rotating link 310 to rotate around its middle, thereby driving the upper end of the rotating link 310 to pull the release pull rod 402 into the interior of the distribution box body 100, thereby pulling the insert pin rod 403 out of the fixing hole. At this time, the protective shutter 200 falls under its own gravity.

[0047] In a preferred embodiment, the shutter trigger assembly further includes a first elastic member 302 and a second elastic member 404. Both ends of the first elastic member 302 respectively abut against the tail of the trigger convex block 301 and the trigger seat 300, and the second elastic member 404 respectively abuts against the bottom of the fixed sleeve 400 and the bottom of the fixed slider 401. The first elastic member 302 and the second elastic member 404 are both spiral springs. The first elastic member 302 and the second elastic member 404 can prevent the shutter trigger assembly from being accidentally triggered.

[0048] In a preferred embodiment, the lifting drive mechanism includes a drive motor 600, two synchronous pulleys 602, and two synchronous drive belts 603. The two synchronous pulleys 602 are respectively fixed to the upper ends of the lifting screws 601, and the synchronous drive belt 603 connects the two synchronous pulleys 602. The drive motor 600 is fixedly arranged on the top of the power distribution box body 100, and the output shaft of the drive motor 600 is connected to one of the lifting screws 601. When the drive motor 600 starts to drive the connected lifting screw 601 to rotate, the synchronous drive belt 603 can drive the other lifting screw 601 to rotate synchronously, so as to drive the two threaded sleeves to lift synchronously.

[0049] In a preferred embodiment, the power distribution box line protection device further includes a sensor assembly and a fire protection controller. The sensor assembly includes a mounting housing 900, an internal temperature sensor 903, and an external temperature sensor 902. The mounting housing 900 is embedded in the inner wall of the side plate of the power distribution box body 100. A heat insulation plate 901 is arranged inside the mounting housing 900. The heat insulation plate 901 divides the internal cavity of the mounting housing 900 into an inner cavity and an outer cavity. The internal temperature sensor 903 and the external temperature sensor 902 are respectively fixed in the inner cavity and the outer cavity. The internal temperature sensor 903 and the external temperature sensor 902 are both connected to the fire protection controller, and the fire protection controller is connected to the drive motor 600 and the injection pump 803.

[0050] The internal temperature sensor 903 and the external temperature sensor 902 respectively detect the temperatures inside and outside the power distribution box body 100. The internal temperature sensor 903 and the external temperature sensor 902 are both provided with temperature thresholds. When the external temperature or the internal temperature exceeds the temperature threshold, the internal temperature sensor 903 or the external temperature sensor 902 sends fire information corresponding to the fire to the fire protection controller. Among them, when the internal temperature sensor 903 senses that the temperature value exceeds the temperature threshold, the internal temperature sensor 903 sends internal fire information to the fire protection controller. When the external temperature sensor 902 senses that the temperature value exceeds the temperature threshold, the external temperature sensor 902 sends external fire information to the fire protection controller. The fire protection controller controls the drive motor 600 and the injection pump 803 to perform corresponding fire protection actions according to the received fire information.

[0051] Reference Figure 9 , the present invention also provides a fire protection method for a power distribution box line protection device that is beneficial to later maintenance. This fire protection method uses the above-mentioned power distribution box line protection device, and this protection method includes the following steps: S1: Sense the fire condition of the power distribution box through the temperature sensors (internal temperature sensor 903 and external temperature sensor 902) of the sensor assembly. This fire condition includes no fire, fire occurring outside the power distribution box, and fire occurring inside the power distribution box; If there is no fire, maintain the original state; If a fire occurs outside the distribution box, perform step S2; If a fire occurs inside the distribution box, sequentially perform steps S2 and S3; It should be noted that when the external fire is large and the temperature inside the distribution box exceeds the temperature threshold of the internal temperature sensor 903, the sensor assembly will also determine that a fire has occurred inside the distribution box at this time.

[0052] S2: The lifting drive mechanism drives the threaded sleeve 702 to rise a certain distance to trigger the shutter assembly, causing the protective shutter 200 to fall and close all the heat dissipation windows 101; S3: The lifting drive mechanism drives the threaded sleeve 702 to continue rising, causing the threaded sleeve 702 to drive the lifting frame 701 and the fireproof bag 700 to move upward. During the upward movement of the lifting frame 701, it drives the rotating hanging plate 503 to rotate, releasing the support of the rotating hanging plate 503 on the fixed hanging plate 504, causing the wiring board 500 to fall into the fireproof bag 700.

[0053] In a preferred embodiment, step S3 further includes step S31, and step S31 is executed after the wiring board 500 falls into the fireproof bag 700; S31: The fire extinguisher sprays fire extinguishing materials into the upper opening of the fireproof bag 700 from above, so that the sprayed fire extinguishing materials cover the upper end of the wiring board 500.

[0054] When a fire breaks out in the power distribution room, the fire protection method of the present invention can not only quickly extinguish the fire in the distribution box where the fire occurs, but also isolate the distribution boxes that have not caught fire, so that they can work normally without being affected by the fire, ensuring that the remaining distribution boxes can work normally, thereby reducing the impact of the fire in the power distribution room on the regional power supply. That is, when the fire is relatively small, the distribution box only closes the heat dissipation window 101 by the falling of the protective shutter 200, and at this time, it does not affect the normal operation of the distribution boxes that have not caught fire, avoiding the occurrence of a large-scale power outage. When the fire is relatively large or a fire occurs inside the distribution box, the wiring board 500 is wrapped by the fireproof bag 700 to achieve the effect of quickly and accurately extinguishing the fire or protecting electrical components and connecting lines.

[0055] In this article, the front, back, up, down and other orientation words are defined based on the positions of the components in the drawings and the positions of the components relative to each other, only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the orientation words should not limit the scope of protection requested by this application.

[0056] Without conflict, the above-mentioned embodiments and the features in the embodiments in this article can be combined with each other.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A power distribution box line protection device that facilitates later maintenance, characterized in that: It includes a power distribution box body (100), a protective shutter (200), a lifting assembly, and a fireproof bag assembly; A wiring board (500) is provided inside the power distribution box body (100); Heat dissipation windows (101) are provided on both side plates and the back plate of the power distribution box body (100). The protective shutter (200) is arranged on the outside of the power distribution box body (100) in a liftable manner. A shutter trigger assembly is further provided on the power distribution box body (100), and the top of the protective shutter (200) is fixed to the shutter trigger assembly; Rotating hanging plates (503) are provided on the inner walls of both side plates of the power distribution box body (100). Fixed hanging plates (504) are provided on both sides of the wiring board (500), and the two fixed hanging plates (504) are respectively supported on the two rotating hanging plates (503); The fireproof bag assembly includes a lifting frame body (701) and a fireproof bag (700). The upper end of the fireproof bag (700) is open and the bottom is closed. The open end of the fireproof bag (700) is fixed to the lifting frame body (701), and threaded sleeves (702) are fixedly provided on both sides of the lifting frame body (701); The lifting assembly includes a lifting drive mechanism and two vertically arranged lifting screw rods (601). The lifting drive mechanism is connected to the two lifting screw rods (601). The two lifting screw rods (601) respectively pass through the two threaded sleeves (702). The lifting drive mechanism drives the lifting screw rods (601) to rotate, driving the lifting frame body (701) to rise to trigger the shutter trigger assembly to lower the protective shutter (200) to close all the heat dissipation windows (101), and to sleeve the wiring board (500) with the fireproof bag (700).

2. The line protection device for a distribution box facilitating later maintenance according to claim 1, wherein: Fixed holes are provided on the inner wall of the protective shutter (200). The shutter trigger assembly includes a shutter fixing module, a trigger module, and a rotating connecting rod (310). The middle of the rotating connecting rod (310) is rotatably connected to the inner wall of the power distribution box body (100); The shutter fixing module includes a fixed sleeve body (400) and a fixed slider (401). The fixed sleeve body (400) is fixed to the side plate of the power distribution box body (100). The fixed slider (401) is slidably arranged in the fixed sleeve body (400). Plug pins (403) and release pull rods (402) are respectively provided at both ends of the fixed slider (401). The plug pin (403) is inserted into the fixed hole, and the release pull rod (402) is rotatably connected to the upper end of the rotating connecting rod (310); The trigger module includes a trigger seat (300) and a trigger projection (301). A sliding trigger hole is provided on the trigger seat (300). The trigger projection (301) is slidably arranged in the sliding trigger hole. The tail of the trigger projection (301) is rotatably connected to the lower end of the rotating connecting rod (310).

3. The line protection device for a distribution box facilitating later maintenance according to claim 2, wherein: The gate trigger assembly further includes a first elastic member (302) and a second elastic member (404). Two ends of the first elastic member (302) respectively abut against the tail of the trigger bump (301) and the trigger seat (300), and the second elastic member (404) abuts against the bottom of the fixed sleeve (400) and the bottom of the fixed slider (401) respectively.

4. A line protection device for a distribution box that facilitates later maintenance according to claim 1, characterized in that: An external fixed support plate (102) is further provided on the distribution box body (100), and the fixed support plate (102) is used to support the lowered protective gate (200).

5. A line protection device for a distribution box that facilitates later maintenance according to claim 1, characterized in that: The lifting drive mechanism includes a drive motor (600), two synchronous belt pulleys (602) and two synchronous drive belts (603). The two synchronous belt pulleys (602) are respectively fixed to the upper ends of the lifting screws (601), and the synchronous drive belts (603) connect the two synchronous belt pulleys (602); The drive motor (600) is fixedly arranged on the top of the distribution box body (100), and the output shaft of the drive motor (600) is connected to one of the lifting screws (601).

6. A line protection device for a distribution box that facilitates later maintenance according to claim 1, characterized in that: It further includes a jet fire extinguisher. The jet fire extinguisher includes a fire extinguishing cylinder (800), a jet pump (803) and a jet pipe (801). The fire extinguishing cylinder (800) is fixed on the top of the distribution box body (100). The fire extinguishing cylinder (800) is connected to the jet pipe (801) through a connecting hose (802). The jet pump (803) is arranged on the connecting hose (802). The jet pipe (801) is fixed directly above the wiring board (500), and a plurality of jet ports are provided at the bottom of the jet pipe (801).

7. A line protection device for a distribution box that facilitates later maintenance according to claim 1, characterized in that: A rotating mounting seat (501) is provided on the inner wall of the distribution box body (100). A limiting support plate (502) is provided at the bottom of the rotating mounting seat (501). The rotating hanging plate (503) is rotatably connected to the rotating mounting seat (501) through a hinge rod. An inclined slot (505) is provided at the end of the rotating hanging plate (503), and the fixed hanging plate (504) is limited and supported in the inclined slot (505).

8. The line protection device for a distribution box that is conducive to later maintenance according to claim 6, characterized in that: It further includes a sensor assembly and a fire protection controller. The sensor assembly includes a mounting housing (900), an internal temperature sensor (903) and an external temperature sensor (902). The mounting housing (900) is embedded in the inner wall of the side plate of the distribution box body (100). A heat insulation plate (901) is provided inside the mounting housing (900). The heat insulation plate (901) divides the internal cavity of the mounting housing (900) into an inner cavity and an outer cavity. The internal temperature sensor (903) and the external temperature sensor (902) are respectively fixed in the inner cavity and the outer cavity. Both the internal temperature sensor (903) and the external temperature sensor (902) are connected to the fire protection controller, and the fire protection controller is connected to the drive motor (600) and the jet pump (803).

9. A fire protection method for a line protection device of a distribution box that facilitates later maintenance, characterized in that, This fire protection method uses the distribution box line protection device according to any one of claims 1-8 which is beneficial to later maintenance. This protection method includes the following steps: S1: Sense the fire condition of the distribution box through a temperature sensor. The fire condition includes no fire, fire occurring outside the distribution box, and fire occurring inside the distribution box; If there is no fire, maintain the original state; If a fire occurs outside the distribution box, perform step S2; If a fire occurs inside the distribution box, sequentially perform steps S2 and S3; S2: The lifting drive mechanism drives the threaded sleeve (702) to rise a certain distance to trigger the shutter assembly, causing the protective shutter (200) to fall and close all heat dissipation windows (101); S3: The lifting drive mechanism drives the threaded sleeve (702) to continue rising, causing the threaded sleeve (702) to drive the lifting frame (701) and the fireproof bag (700) to move upward. During the upward movement of the lifting frame (701), it drives the rotating hanging plate (503) to rotate, and the support of the rotating hanging plate (503) for the fixed hanging plate (504) is released, causing the wiring board (500) to fall into the fireproof bag (700).

10. The fire protection method of the power distribution box line protection device beneficial to later maintenance according to claim 9, characterized in that, Step S3 also includes step S31, and step S31 is executed after the wiring board (500) falls into the fireproof bag (700); S31: The fire extinguisher sprays fire extinguishing material into the upper opening of the fireproof bag (700) from above, so that the sprayed fire extinguishing material covers the upper end of the wiring board (500).

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