High-low voltage power distribution cabinet with protection structure

Abstract

The invention relates to the technical field of high-low voltage power distribution cabinets, in particular to a high-low voltage power distribution cabinet with a protection structure, which comprises a cabinet body, a cabinet door is rotatably mounted on the front side surface of the cabinet body, an inner frame is fixedly connected to the front inner wall of the inner cavity of the cabinet body, the side surface of the cabinet door is in contact with the side surface of the inner frame, and a closed groove is formed in the side surface of the cabinet body. A closed groove is formed in the top of the cabinet body, the closed groove penetrates through heat dissipation holes in the side face of the cabinet body, a nitrogen discharging mechanism is installed at the top of the cabinet body, and a sealing mechanism used for sealing the heat dissipation holes is installed at the top of the cabinet body. Therefore, the air in the dead angle area in the cabinet body is stirred, the air enters the flowing air flow to be pumped away, the more uniform air pumping effect is achieved, the effect of reducing the oxygen content in the cabinet body is achieved, the fire behavior in the cabinet is inhibited or extinguished in time, and fire expansion is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-low voltage power distribution cabinet, in particular to a high-low voltage power distribution cabinet with a protection structure. BACKGROUND

[0002] The high-low voltage power distribution cabinet is a power distribution device used for power distribution, control, measurement and cable connection in the power supply system. The power supply bureau and the transformer substation usually use high-voltage switch cabinets, and then the low-voltage side of the transformer is connected to the low-voltage power distribution cabinet, and the low-voltage power distribution cabinet is connected to various power distribution panels, control boxes and switch boxes. The inside is a device that achieves the design function requirements of the power distribution device by assembling some switches, circuit breakers, fuses, buttons, indicator lights, instruments, wires and other protection devices.

[0003] There are many electrical components in the power distribution cabinet and they are arranged closely. When the electrical components operate, heat is generated. When the heat in the power distribution cabinet cannot be quickly dissipated, the heat in the cabinet is high, which is easy to cause heat burning, electric burning and other phenomena. When the insulation of some wires in the cabinet is damaged, causing short circuit or long-time overload, the temperature of the wires rises, resulting in strong sparks and arcs, which makes the insulation layer burn quickly, the metal is melted, and the surrounding combustible materials are burned, which also causes a fire. Although some existing high-low voltage power distribution cabinets are provided with a monitoring system, the function is single and the high-low voltage power distribution cabinet cannot be well protected. Especially when a fire occurs in the high-low voltage power distribution cabinet, the fire in the cabinet cannot be suppressed or extinguished in time, which is easy to cause the fire to expand and cause unnecessary loss. SUMMARY

[0004] The purpose of the present application is to provide a high-low voltage power distribution cabinet with a protection structure to solve the problems in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a high-low voltage power distribution cabinet with a protection structure, comprising a cabinet body, a cabinet door rotatably installed on the front side of the cabinet body, an inner frame fixedly connected to the front inner wall of the inner cavity of the cabinet body, the side of the cabinet door in contact with the side of the inner frame, a closed groove is formed in the side of the cabinet body, the closed groove penetrates the heat dissipation hole in the side of the cabinet body, a nitrogen discharge mechanism is installed on the top of the cabinet body, a sealing mechanism for sealing the heat dissipation hole is installed on the top of the cabinet body, a gas transmission mechanism is installed on the side of the sealing mechanism, a sealing air bag is installed on the side of the inner frame close to the cabinet door, and the gas transmission mechanism is connected with the sealing air bag. The cabinet body is fixedly installed with an exhaust hood, the inner cavity of the exhaust hood is in communication with the inner cavity of the cabinet body, the bottom of the exhaust hood is fixedly installed with a butt joint pipe, the lower end of the butt joint pipe is connected with the suction end of the negative pressure pump through a suction pipe, and a plurality of air deflectors are installed at equal intervals on the upper end of the inner cavity of the exhaust hood.

[0006] Preferably, the sealing mechanism includes an electric push rod fixedly installed on the upper end of the cabinet, a lifting plate fixedly installed on the upper end of the inner rod of the electric push rod, a sealing plate fixedly installed on the side of the lifting plate, and the sealing plate slidingly connected to the sealing groove.

[0007] Preferably, the nitrogen emission mechanism includes a nitrogen high-pressure tank fixedly installed on the top of the cabinet. A connecting pipe is fixedly installed at the outlet end of the nitrogen high-pressure tank. The connecting pipe extends downward through the top of the cabinet. One end of the connecting pipe inside the cabinet cavity is fixedly connected to an outlet pipe. Multiple outlet nozzles are fixedly installed at equal intervals on the side of the outlet pipe.

[0008] Preferably, the gas transmission mechanism includes an air storage cylinder fixedly installed on the top of the cabinet. One end of the air storage cylinder is open, and a gas guide pipe is fixedly inserted into the closed end of the air storage cylinder. One end of the gas guide pipe passes through the top of the cabinet and is inserted into the inner frame. The end of the gas guide pipe away from the air storage cylinder is fixedly inserted into a sealing airbag. A fixed cover is fixedly installed at the open end of the air storage cylinder. A stopper rod is slidably inserted through the side of the fixed cover. A piston head is fixedly installed at the end of the stopper rod inside the air storage cylinder. The end of the stopper rod outside the air storage cylinder is connected to the lifting plate through a transmission assembly.

[0009] Preferably, the transmission assembly includes a movable plate fixedly connected to the end of the piston rod away from the piston head, a movable arm rotatably connected to the side of the movable plate, the end of the movable arm away from the movable plate being rotatably connected to the lifting plate via a rotating shaft, and limit frames symmetrically slidably connected to both ends of the movable plate, the limit frames being fixedly connected to the top of the cabinet.

[0010] Preferably, the movable plate has symmetrical grooves at both ends, the grooves are engaged with the limiting frame, and the grooves are slidably connected to the limiting frame.

[0011] Preferably, the inner cavity of the docking pipe is equipped with a driving mechanism, and the upper end of the driving mechanism is equipped with a shaking component that drives the air guide plate to swing in the inner cavity of the exhaust hopper. The two ends of the air guide plate are symmetrically fixedly connected with shafts, and the air guide plate is rotatably connected to the exhaust hopper through the shafts.

[0012] Preferably, the driving mechanism includes an inner support frame fixedly connected to the inner cavity of the docking pipe, a round rod rotatably connected to the upper end of the inner support frame, a support frame fixedly connected to the inner cavity of the exhaust hopper, the upper end of the round rod rotatably connected to the support frame, a driving gear and a fan blade being fixedly sleeved on the outer side of the round rod from top to bottom, a round shaft rotatably connected to the support frame, a reduction gear being fixedly connected to the lower end of the round shaft, and the reduction gear meshing with the driving gear; A transmission plate is fixedly connected to the upper end of the circular shaft, and a drive rod is fixedly connected to the upper end of the transmission plate. A transmission bearing is fixedly sleeved on the outer side of the drive rod.

[0013] Preferably, the shaking assembly comprises a shaking frame slidingly mounted on the upper end of the transmission plate, the lower end of the shaking frame is upwardly provided with a shaking groove, the transmission bearing is in rolling connection with the shaking groove, and the upper end of the shaking frame is equidistantly fixedly provided with a plurality of concave frames, both sides of the concave frame are symmetrically provided with swinging grooves; The inner side of the exhaust hopper is symmetrically provided with a sliding groove, both sides of the shaking frame are symmetrically fixedly connected with sliding plates, the sliding plates are in sliding connection with the sliding groove, the lower end of each air deflector is symmetrically fixedly provided with a swinging frame, and the lower end of each swinging frame close to the concave frame is rotatably provided with a swinging roller, and the swinging roller is in rolling connection with the swinging groove.

[0014] Compared with the prior art, the present application has the advantages of reasonable structure and strong functionality, and has the following advantages: 1. When the temperature in the inner cavity of the cabinet is high and a fire occurs, the sealing plate in the sealing mechanism seals the heat dissipation hole of the cabinet, preventing external air from entering the cabinet, and the controller controls the electric control valve to start and open, so that the high-pressure nitrogen gas in the nitrogen gas high-pressure tank is sprayed downward along the connecting pipe, the gas outlet pipe and the gas outlet nozzle, and the nitrogen gas is introduced into the inner cavity of the cabinet from top to bottom, so that the inner cavity of the cabinet is filled with nitrogen gas, and the injection of nitrogen gas has the effect of dilution and downward driving of oxygen.

[0015] 2. When the lifting plate moves downward, the transmission assembly moves, the transmission assembly drives the plug rod to insert into the gas cylinder, the gas transmission mechanism fills the gas in the gas cylinder into the sealing air bag, so that the sealing air bag expands, the cabinet door and the cabinet are sealingly connected, and external air is prevented from entering the cabinet.

[0016] 3. The negative pressure pump is used to pump out the air in the cabinet, when the air quickly passes through the inner cavity of the butt joint pipe, the airflow drives the fan blades to rotate, the driving mechanism drives the shaking assembly to reciprocate, the shaking assembly drives the air deflector to reciprocate, and the air deflector can periodically change the local airflow direction and negative pressure area near the exhaust hopper port, so as to "stir" the air in the dead angle area of the cabinet, so that it enters the flowing airflow and is pumped away, realizing more uniform pumping effect, so as to reduce the oxygen content in the cabinet, timely suppress or extinguish the fire in the cabinet, and avoid the expansion of the fire.

[0017] 4. The driving mechanism, swinging assembly and air deflector are arranged to greatly improve the oxygen replacement efficiency, quickly reduce the oxygen concentration to the combustion threshold, realize "asphyxia" fire extinguishing, fire suppression or explosion prevention, reduce the oxygen concentration in the air in the cabinet, intervene in the early warning stage without power failure, make the fire extinguishing level more in-depth, and have higher reliability, so as to effectively prevent the risk of "back burning" or "explosion" of the cabinet when the door is opened or broken. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure perspective view of high and low voltage power distribution cabinet of the present application; Figure 2 It is the first side sectional view of high and low voltage power distribution cabinet structure of the present application; Figure 3 It is Figure 2 It is the structure enlarged schematic view of middle A; Figure 4 It is Figure 2 It is the structure enlarged schematic view of middle B; Figure 5 It is the second side sectional view of high and low voltage power distribution cabinet structure of the present application; Figure 6 It is Figure 5 It is the structure enlarged schematic view of middle C; Figure 7 It is the explosion view of high and low voltage power distribution cabinet structure of the present application; Figure 8 It is the side sectional view of exhaust hopper and butt joint pipeline structure of the present application; Figure 9 It is the sectional view of exhaust hopper, driving mechanism and shaking assembly structure of the present application; Figure 10 It is the explosion view of exhaust hopper, air deflector, driving mechanism and shaking assembly of the present application.

[0019] In the figure: 1, cabinet body; 11, cabinet door; 12, inner frame; 13, closed groove; 14, nitrogen high pressure tank; 15, connecting pipe; 16, air outlet pipe; 2, electric push rod; 21, lifting plate; 22, sealing plate; 3, gas storage cylinder; 31, gas guide pipe; 32, sealing air bag; 33, fixed cover; 34, plug rod; 35, piston head; 4, movable plate; 41, movable arm; 42, limiting frame; 5, exhaust hopper; 51, sliding groove; 52, butt joint pipeline; 53, air deflector; 54, swinging frame; 55, swinging roller; 56, supporting frame; 57, negative pressure pump; 6, shaking frame; 61, shaking groove; 62, sliding plate; 63, concave frame; 64, swinging groove; 7, inner supporting frame; 71, round rod; 72, fan blade; 73, driving gear; 8, round shaft; 81, speed reduction gear; 82, transmission plate; 83, driving rod; 84, transmission bearing. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0021] Please refer to Figures 1 to 10The application provides a technical scheme: a high-low voltage power distribution cabinet with a protection structure, which comprises a cabinet body 1, a cabinet door 11 rotatably installed on the front side of the cabinet body 1, an inner frame 12 fixedly connected to the front inner wall of the inner cavity of the cabinet body 1, the side of the cabinet door 11 in contact with the side of the inner frame 12, a closed groove 13 formed in the side of the cabinet body 1, the closed groove 13 penetrating through the heat dissipation holes in the side of the cabinet body 1, a nitrogen discharge mechanism installed on the top of the cabinet body 1, a sealing mechanism for sealing the heat dissipation holes installed on the top of the cabinet body 1, a gas transmission mechanism installed on the side of the sealing mechanism, a sealing air bag 32 installed on the side of the inner frame 12 close to the cabinet door 11, the sealing air bag 32 being matched with the shape of the inner frame 12, and the sealing air bag 32 being shrunk in the inner frame 12 when no gas is filled in the sealing air bag 32, the gas transmission mechanism being connected with the sealing air bag 32 and used for filling gas in the sealing air bag 32 or discharging the gas in the sealing air bag 32. The cabinet body 1 is fixedly installed with an exhaust hood 5, the inner cavity of the exhaust hood 5 is in communication with the inner cavity of the cabinet body 1, the bottom of the exhaust hood 5 is fixedly installed with a butt joint pipeline 52, the lower end of the butt joint pipeline 52 is connected with the gas suction end of a negative pressure pump 57 through a gas suction pipe, and the upper end of the inner cavity of the exhaust hood 5 is installed with a plurality of air deflectors 53 at equal intervals.

[0022] The inner cavity of the cabinet body 1 is installed with a temperature sensor and a smoke sensor, the temperature sensor and the smoke sensor are used for cooperating to monitor the temperature and the operation condition of the inner cavity of the cabinet body 1 in real time, the temperature sensor and the smoke sensor are triggered when the temperature in the cabinet body 1 is too high and a fire occurs, the temperature sensor and the smoke sensor send signals to a controller, the controller sends control instructions to a nitrogen discharge mechanism, a sealing mechanism and the negative pressure pump 57 after receiving the signals, the nitrogen discharge mechanism, the sealing mechanism and the negative pressure pump 57 are operated, and the negative pressure pump 57 stops gas suction after operating for a certain time, so that the cabinet body 1 is prevented from being deformed.

[0023] Please refer to Figure 1 , Figure 2 and Figure 7 , the sealing mechanism comprises an electric push rod 2 fixedly installed on the upper end of the cabinet body 1, the inner rod of the electric push rod 2 is fixedly installed with a lifting plate 21 at the upper end, the side of the lifting plate 21 is fixedly installed with a sealing plate 22, and the sealing plate 22 is in sliding connection with the closed groove 13 in the up-down direction.

[0024] When it is necessary to close the heat dissipation holes of the cabinet body 1, the inner rod of the electric push rod 2 is shrunk to drive the lifting plate 21 to move downwards, the lifting plate 21 drives the sealing plate 22 to slide downwards along the closed groove 13, the sealing plate 22 penetrates through the plurality of heat dissipation holes, so that the heat dissipation holes are closed, and external gas is prevented from entering the cabinet body 1; When it is necessary to release the closure of the heat dissipation hole, the inner rod of the electric push rod 2 is extended to drive the lifting plate 21 to move upward, the lifting plate 21 drives the sealing plate 22 to slide upward along the sealing groove 13, and the sealing plate 22 is separated from the heat dissipation hole, so that the sealing of the heat dissipation hole is released, and the cabinet 1 can normally dissipate heat; in order to improve the normal heat dissipation efficiency of the cabinet 1, a heat dissipation fan can be installed below the inner cavity of the cabinet 1, so as to accelerate the heat dissipation of the cabinet 1.

[0025] Please refer to Figure 1 、 Figure 5 and Figure 7 , the nitrogen discharge mechanism comprises a nitrogen high-pressure tank 14 fixedly installed on the top of the cabinet 1, a connecting pipe 15 is fixedly installed at the gas outlet end of the nitrogen high-pressure tank 14, the connecting pipe 15 penetrates downward through the top of the cabinet 1, one end of the connecting pipe 15 in the inner cavity of the cabinet 1 is fixedly communicated with a gas outlet pipe 16, and a plurality of gas outlet nozzles are fixedly installed on the side surface of the gas outlet pipe 16 at equal intervals.

[0026] The gas outlet pipe 16 and the gas outlet nozzle are both distributed at the upper end of the inner cavity of the cabinet 1, so that the nitrogen gas enters the inner cavity of the cabinet 1 from top to bottom, and an electric control valve is installed on the connecting pipe 15, which controls the opening and closing of the connecting pipe 15; When the temperature in the cabinet 1 is too high and a fire occurs, the sealing mechanism is used to close the heat dissipation hole of the cabinet 1 to prevent external air from entering the cabinet 1, and the controller is used to control the electric control valve to start and open, so that the high-pressure nitrogen gas in the nitrogen high-pressure tank 14 flows into the gas outlet pipe 16 along the connecting pipe 15, and then is sprayed downward along the gas outlet nozzles on the side surface of the gas outlet pipe 16, so that the nitrogen gas enters the inner cavity of the cabinet 1 from top to bottom, thereby filling the cabinet 1 with nitrogen gas. Since the density of oxygen is slightly heavier than that of nitrogen, the injection of nitrogen gas can dilute and drive oxygen downward; At the same time, the negative pressure pump 57 is started, and the negative pressure pump 57 draws out the air in the cabinet 1 through the air suction pipe, the butt joint pipe 52 and the exhaust hopper 5. At this time, the oxygen in the drawn-out air is the most, so as to reduce the oxygen concentration in the inner cavity of the cabinet 1; By utilizing the characteristics that the density of nitrogen is close to that of air and slightly lighter than that of air, the nitrogen gas released from the top can better diffuse downward, and at the same time, the oxygen-rich air is extracted from the bottom by the negative pressure pump 57, which can greatly improve the oxygen replacement efficiency and quickly reduce the oxygen concentration to below 15%, thereby achieving "asphyxiation" fire extinguishing, fire suppression or explosion prevention.

[0027] Please refer to Figures 1 to 3 、 Figures 5 to 7The gas transmission mechanism comprises a gas cylinder 3 fixedly installed at the top of the cabinet body 1, one end of the gas cylinder 3 is open, a gas guide pipe 31 is fixedly inserted into the closed end of the gas cylinder 3, one end of the gas guide pipe 31 penetrates through the top of the cabinet body 1 and is inserted into the inner frame 12, and the end of the gas guide pipe 31 away from the gas cylinder 3 is fixedly inserted into a sealed air bag 32, the gas guide pipe 31 is in communication with the sealed air bag 32, a fixed cover 33 is fixedly installed at the open end of the gas cylinder 3, a plug rod 34 is slidably inserted into the side of the fixed cover 33, a piston head 35 is fixedly installed at one end of the plug rod 34 in the gas cylinder 3, and the other end of the plug rod 34 is connected with the lifting plate 21 through a transmission assembly.

[0028] The transmission assembly comprises a movable plate 4 fixedly connected to the end of the plug rod 34 away from the piston head 35, a movable arm 41 is rotatably connected to the side of the movable plate 4, the movable plate 4 is rotatably connected with the movable arm 41 through a rotating shaft or a hinge, one end of the movable arm 41 away from the movable plate 4 is rotatably connected with the lifting plate 21 through a rotating shaft, and the two ends of the movable plate 4 are symmetrically slidably connected with limiting racks 42 fixedly connected with the top of the cabinet body 1.

[0029] The two ends of the movable plate 4 are symmetrically provided with recesses clamped on the limiting racks 42 and slidably connected with the limiting racks 42, so that the movable plate 4 can stably move.

[0030] When the lifting plate 21 moves downward, the lifting plate 21 drives the movable arm 41 to rotate downward, the movable arm 41 drives the movable plate 4 to move close to the fixed cover 33, the movable plate 4 drives the plug rod 34 to be inserted into the gas cylinder 3, the plug rod 34 drives the piston head 35 to move away from the fixed cover 33, the gas in the gas cylinder 3 is squeezed out through the piston head 35, the gas in the gas cylinder 3 enters the sealed air bag 32 along the gas guide pipe 31, so that the sealed air bag 32 expands and abuts against the inner side wall of the cabinet door 11, thereby sealingly connecting the cabinet door 11 and the inner frame 12 and sealingly connecting the cabinet door 11 and the cabinet body 1.

[0031] When the lifting plate 21 moves upward, the lifting plate 21 drives the movable arm 41 to rotate upward, the movable arm 41 drives the plug rod 34 to move out of the gas cylinder 3 through the movable plate 4, the plug rod 34 drives the piston head 35 to move close to the fixed cover 33, the gas in the sealed air bag 32 is sucked away through the piston head 35, and the gas enters the gas cylinder 3 along the gas guide pipe 31, so that the sealed air bag 32 shrinks.

[0032] Please refer to Figure 2 , Figure 4 , Figures 7 to 10 , the inner cavity of the docking pipe 52 is provided with a driving mechanism, the upper end of the driving mechanism is provided with a shaking assembly for driving the air deflector 53 to swing in the inner cavity of the exhaust hopper 5, the two ends of the air deflector 53 are fixedly connected with shaft rods, and the air deflector 53 is rotatably connected with the exhaust hopper 5 through the shaft rods.

[0033] Please refer to Figures 8 to 10 , the drive mechanism comprises an inner support frame 7 fixedly connected in the inner cavity of the docking pipeline 52, the upper end of the inner support frame 7 is rotatably connected with a round rod 71, the inner cavity of the exhaust hopper 5 is fixedly connected with a support frame 56, the upper end of the round rod 71 is rotatably connected with the support frame 56, the outer side of the round rod 71 is sequentially fixedly sleeved with a drive gear 73 and a fan blade 72 from top to bottom, the support frame 56 is rotatably connected with a round shaft 8, the round shaft 8 penetrates through the support frame 56, the lower end of the round shaft 8 is fixedly connected with a reduction gear 81, the reduction gear 81 is engaged with the drive gear 73, the diameter of the reduction gear 81 is greater than that of the drive gear 73, so that the drive gear 73 needs to rotate several rounds to drive the reduction gear 81 to rotate one round, thereby making the rotating speed of the round shaft 8 lower than that of the round rod 71; The upper end of the round shaft 8 is fixedly connected with a transmission plate 82, the transmission plate 82 and the reduction gear 81 are arranged on the upper and lower sides of the support frame 56 respectively, the upper end of the transmission plate 82 is fixedly connected with a drive rod 83, and the outer side surface of the drive rod 83 is fixedly sleeved with a transmission bearing 84.

[0034] When it is needed to exhaust the air in the cabinet body 1, the negative pressure pump 57 is started, so that the air in the cabinet body 1 flows downward along the exhaust hopper 5 and the docking pipeline 52, and finally is exhausted through the exhaust end of the air suction pipe and the negative pressure pump 57; When the air rapidly passes through the inner cavity of the docking pipeline 52, the airflow pushes the fan blade 72 to rotate, the fan blade 72 drives the round rod 71 to rotate, the round rod 71 drives the drive gear 73 to rotate, the drive gear 73 drives the reduction gear 81 to rotate, the reduction gear 81 drives the transmission plate 82 to rotate through the round shaft 8, and the transmission plate 82 drives the transmission bearing 84 to rotate through the drive rod 83; In order to reduce the friction, the round rod 71 is rotatably connected with the inner support frame 7 and the support frame 56 through bearings, and the round shaft 8 is rotatably connected with the support frame 56 through a bearing.

[0035] Please refer to Figure 4 、 Figures 8 to 10 , the shaking assembly comprises a shaking frame 6 slidingly installed on the upper end of the transmission plate 82, the lower end of the shaking frame 6 is upwardly penetrated to form a shaking groove 61, the transmission bearing 84 is rollingly connected with the shaking groove 61, a plurality of concave frames 63 are equidistantly and fixedly installed on the upper end of the shaking frame 6, swing grooves 64 are symmetrically formed on the two sides of each concave frame 63, the number of the concave frames 63 is same as that of the air deflectors 53, and each concave frame 63 is one-to-one correspondingly distributed below one air deflector 53; The inner side of the exhaust hopper 5 is symmetrically provided with a sliding groove 51, and the two sides of the shaking frame 6 are symmetrically fixedly connected with sliding plates 62 which are in sliding connection with the sliding groove 51. The lower end of each air deflector 53 is symmetrically fixedly provided with a swinging frame 54, and the lower end of each swinging frame 54 close to the concave frame 63 is rotatably provided with a swinging roller 55 which is in rolling connection with the swinging groove 64.

[0036] When the transmission bearing 84 rotates along the shaking groove 61, the transmission bearing 84 pushes the shaking frame 6 to move back and forth, and the shaking frame 6 drives the plurality of concave frames 63 on it to move back and forth synchronously. When the concave frame 63 moves, the swinging groove 64 on the side of the concave frame 63 drives the swinging roller 55 to move back and forth synchronously. At this time, the swinging roller 55 is in rolling connection with the swinging groove 64, and the swinging frame 54 is driven by the swinging roller 55 to swing back and forth, and the air deflector 53 is driven by the swinging frame 54 to swing back and forth. At this time, the air deflector 53 swings around the axis of the shaft as the center; The shaking assembly is driven by the driving mechanism to swing back and forth, and the air deflector 53 is driven by the shaking assembly to swing back and forth. The air deflector 53 can periodically change the local airflow direction and negative pressure area near the port of the exhaust hopper 5, so as to "stir" the air in the dead angle area of the cabinet 1 to make it enter the flowing air flow and be sucked away, so as to realize more uniform air suction effect, so as to achieve the effect of reducing the oxygen content in the cabinet 1. By timely suppressing or extinguishing the fire in the cabinet, the fire is prevented from expanding.

[0037] Working principle: when the inner cavity of the cabinet 1 is in fire due to high temperature, the inner rod of the electric push rod 2 is retracted to drive the lifting plate 21 to move downward, so that the sealing plate 22 in the sealing mechanism seals the heat dissipation hole of the cabinet 1, preventing external air from entering the cabinet 1. At the same time, the controller is used to control the electric control valve to start and open, so that the high-pressure nitrogen gas in the nitrogen gas high-pressure tank 14 is sprayed downward along the connecting pipe 15, the gas outlet pipe 16 and the gas outlet nozzle, so that the nitrogen gas is introduced into the inner cavity of the cabinet 1 from top to bottom, so that the inner cavity of the cabinet 1 is filled with nitrogen gas, and the effect of dilution and downward driving of oxygen gas is achieved by the injection of nitrogen gas; When the lifting plate 21 moves downward, the transmission assembly is driven to move, and the plug rod 34 is inserted into the gas cylinder 3, so that the gas in the gas cylinder 3 is filled into the sealing air bag 32 through the gas transmission mechanism, so that the sealing air bag 32 is inflated, and the cabinet door 11 is sealingly connected with the cabinet 1, preventing external air from entering the cabinet 1; At the same time, the negative pressure pump 57 is started, and the negative pressure pump 57 draws the air in the cabinet 1 out through the air exhaust pipe, the docking pipeline 52 and the exhaust funnel 5. When the air rapidly passes through the inner cavity of the docking pipeline 52, the airflow pushes the fan blade 72 to rotate, so that the driving mechanism is started, and the driving mechanism drives the shaking assembly to reciprocate, and the shaking assembly drives the air deflector 53 to reciprocate. The air deflector 53 can periodically change the local airflow direction and negative pressure area near the port of the exhaust funnel 5, so as to “stir” the air in the dead angle area of the cabinet 1 to enter the flowing airflow and be drawn away, so as to achieve a more uniform air exhaust effect, thereby reducing the oxygen content in the cabinet 1, and timely suppressing or extinguishing the fire in the cabinet, and avoiding the expansion of the fire; Through the cooperation of the driving mechanism, the swinging assembly and the air deflector 53, the oxygen replacement efficiency can be greatly improved, the oxygen concentration can be rapidly reduced to below 15%, and the “asphyxia” fire extinguishing, fire suppression or explosion prevention can be realized. By reducing the oxygen concentration in the air in the cabinet 1, the intervention can be made in the non-power-off or early warning stage, so that the fire extinguishing level is deeper, the reliability is higher, and the risk of “back burning” or “explosion” of the cabinet 1 when the door is opened or broken can be effectively prevented.

[0038] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A high- and low-voltage distribution cabinet with a protective structure, comprising a cabinet body (1), a cabinet door (11) rotatably mounted on the front side of the cabinet body (1), an inner frame (12) fixedly connected to the front inner wall of the inner cavity of the cabinet body (1), and the side of the cabinet door (11) contacting the side of the inner frame (12), characterized in that: The cabinet (1) has a closed groove (13) on its side, which passes through the heat dissipation hole on the side of the cabinet (1). A nitrogen emission mechanism is installed on the top of the cabinet (1). A sealing mechanism for sealing the heat dissipation hole is installed on the top of the cabinet (1). A gas transmission mechanism is installed on the side of the sealing mechanism. A sealing airbag (32) is installed on the side of the inner frame (12) near the cabinet door (11). The gas transmission mechanism is connected to the sealing airbag (32). The cabinet (1) is fixedly installed with an exhaust hopper (5), the inner cavity of the exhaust hopper (5) is connected to the inner cavity of the cabinet (1), the bottom of the exhaust hopper (5) is fixedly installed with a connecting pipe (52), the lower end of the connecting pipe (52) is connected to the suction end of the negative pressure pump (57) through a suction pipe, and multiple air guide plates (53) are installed at equal intervals on the upper end of the inner cavity of the exhaust hopper (5).

2. A high- and low-voltage distribution cabinet with a protective structure according to claim 1, characterized in that: The sealing mechanism includes an electric push rod (2) fixedly installed on the upper end of the cabinet (1). A lifting plate (21) is fixedly installed on the upper end of the inner rod of the electric push rod (2). A sealing plate (22) is fixedly installed on the side of the lifting plate (21). The sealing plate (22) is slidably connected to the sealing groove (13).

3. A high- and low-voltage distribution cabinet with a protective structure according to claim 1, characterized in that: The nitrogen emission mechanism includes a nitrogen high-pressure tank (14) fixedly installed on the top of the cabinet (1). A connecting pipe (15) is fixedly installed at the outlet end of the nitrogen high-pressure tank (14). The connecting pipe (15) extends downward through the top of the cabinet (1). One end of the connecting pipe (15) in the inner cavity of the cabinet (1) is fixedly connected to an outlet pipe (16). Multiple outlet nozzles are fixedly installed at equal intervals on the side of the outlet pipe (16).

4. A high- and low-voltage distribution cabinet with a protective structure according to claim 2, characterized in that: The gas transmission mechanism includes an air storage cylinder (3) fixedly installed on the top of the cabinet (1). One end of the air storage cylinder (3) is open. A gas guide pipe (31) is fixedly inserted into the closed end of the air storage cylinder (3). One end of the gas guide pipe (31) passes through the top of the cabinet (1) and is inserted into the inner frame (12). The end of the gas guide pipe (31) away from the air storage cylinder (3) is fixedly inserted into the sealing airbag (32). A fixed cover (33) is fixedly installed at the open end of the air storage cylinder (3). A stopper rod (34) is slidably inserted through the side of the fixed cover (33). A piston head (35) is fixedly installed at the end of the stopper rod (34) inside the air storage cylinder (3). The end of the stopper rod (34) outside the air storage cylinder (3) is connected to the lifting plate (21) through a transmission assembly.

5. A high- and low-voltage distribution cabinet with a protective structure according to claim 4, characterized in that: The transmission assembly includes a movable plate (4) fixedly connected to the end of the piston rod (34) away from the piston head (35). A movable arm (41) is rotatably connected to the side of the movable plate (4). The end of the movable arm (41) away from the movable plate (4) is rotatably connected to the lifting plate (21) through a rotating shaft. Limiting frames (42) are symmetrically slidably connected to both ends of the movable plate (4). The limiting frames (42) are fixedly connected to the top of the cabinet (1).

6. A high- and low-voltage distribution cabinet with a protective structure according to claim 5, characterized in that: The movable plate (4) has symmetrical grooves at both ends, which are engaged with the limiting frame (42) and are slidably connected to the limiting frame (42).

7. A high- and low-voltage distribution cabinet with a protective structure according to claim 1, characterized in that: The inner cavity of the docking pipe (52) is equipped with a driving mechanism. The upper end of the driving mechanism is equipped with a shaking component that drives the air guide plate (53) to swing in the inner cavity of the exhaust hopper (5). The two ends of the air guide plate (53) are symmetrically fixedly connected with shafts. The air guide plate (53) is rotatably connected to the exhaust hopper (5) through the shafts.

8. A high- and low-voltage distribution cabinet with a protective structure according to claim 7, characterized in that: The drive mechanism includes an inner support frame (7) fixedly connected to the inner cavity of the docking pipe (52). A round rod (71) is rotatably connected to the upper end of the inner support frame (7). A support frame (56) is fixedly connected to the inner cavity of the exhaust hopper (5). The upper end of the round rod (71) is rotatably connected to the support frame (56). A drive gear (73) and a fan blade (72) are fixedly sleeved on the outer side of the round rod (71) from top to bottom. A round shaft (8) is rotatably connected to the support frame (56). A reduction gear (81) is fixedly connected to the lower end of the round shaft (8). The reduction gear (81) meshes with the drive gear (73). A transmission plate (82) is fixedly connected to the upper end of the round shaft (8), and a drive rod (83) is fixedly connected to the upper end of the transmission plate (82). A transmission bearing (84) is fixedly sleeved on the outer side of the drive rod (83).

9. A high- and low-voltage distribution cabinet with a protective structure according to claim 8, characterized in that: The vibration assembly includes a vibration frame (6) that is slidably mounted on the upper end of the transmission plate (82). The lower end of the vibration frame (6) is provided with a vibration groove (61) extending upward. The transmission bearing (84) is tumbling connected to the vibration groove (61). Multiple concave frames (63) are fixedly mounted at equal intervals on the upper end of the vibration frame (6). Swing grooves (64) are symmetrically provided on both sides of the concave frames (63). The inner side of the exhaust hopper (5) is symmetrically provided with a sliding groove (51). The two sides of the shaking frame (6) are symmetrically fixedly connected with a sliding plate (62). The sliding plate (62) is slidably connected to the sliding groove (51). The lower end of each air guide plate (53) is symmetrically fixedly installed with a swing frame (54). The lower end of each swing frame (54) near the concave frame (63) is rotatably installed with a swing roller (55). The swing roller (55) is rotatably connected to the swing groove (64).

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