A protection structure of high-low voltage switch cabinet

Abstract

The application discloses a protection structure of a high-low voltage switch cabinet and belongs to the technical field of switch cabinets. The protection structure comprises a protection cover, a plurality of mounting grooves are formed in the inner wall of the protection cover, a cutting assembly is mounted in the mounting grooves, sleeve blocks are fixedly installed at positions corresponding to the mounting grooves on the inner wall of the protection cover, a first storage groove is formed in the inner side of the upper side of each sleeve block, a heat-expanding liquid is stored in the first storage groove, a piston groove is formed in the inner side of the side of each sleeve block close to the mounting groove, and a fixing assembly is mounted in the piston groove. The heat-expanding liquid is deformed by heat to drive a cutting knife to cut a fault cable, and no temperature sensor, electromagnetic circuit breaker or other electric control components are needed. The protection structure does not rely on an external control loop for power supply. Even if the switch cabinet is short-circuited and catches fire to cause the control loop to lose power, the cutting mechanism can still be normally triggered. Meanwhile, the protection structure can respond to the gradual temperature rise and aging of the cable in real time, eliminates the defects of response delay and poor recognition accuracy of the electric control components, and blocks the risk of continuous heating and fire of the cable from the source.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, and more specifically, to a protective structure for high and low voltage switchgear. Background Technology

[0002] High and low voltage switchgear is a core basic equipment in power transmission and distribution systems. It is widely used in industrial and mining enterprises, municipal power supply, substation hubs and other scenarios. It is mainly used to store and manage high and low voltage cables and power distribution components to realize the distribution, switching and protection control of power. The cables in the cabinet carry load current for a long time. Affected by environmental temperature and humidity, insulation aging, overload heating, poor contact and other factors, local abnormal temperature rise is very likely to occur. If it is not dealt with in time, it can easily lead to safety accidents such as cable insulation breakdown, short circuit fire or even cabinet explosion.

[0003] Currently, traditional protection schemes mostly rely on electrical control components such as temperature sensors and electromagnetic circuit breakers to achieve power outage protection. This type of protection structure, which depends on external power supply and control circuit, has inherent defects: when a serious fault occurs in the switch cabinet and causes the control circuit to lose power, the protection device will directly fail and cannot trigger the power outage operation. At the same time, the response of electrical control components is delayed, and the accuracy of identifying progressive faults such as local overheating and latent aging of cables is insufficient, making it difficult to cut off faulty cables in time. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of this invention is to provide a protective structure for high and low voltage switchgear.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A protective structure for a high and low voltage switchgear includes a protective cover. The inner wall of the protective cover has multiple mounting slots. A cutting assembly is installed inside the mounting slot. The cutting assembly is used to cut off the wire in case of an accident. The cutting assembly includes a cutter that is slidably installed inside the mounting slot. A compression spring is fixedly installed at one end of the cutter inside the mounting slot. The end of the compression spring away from the cutter is fixedly connected to the inner wall of the mounting slot. The inner wall of the protective cover is fixedly installed with a sleeve block at the position corresponding to the mounting groove. The sleeve block has a through hole in the middle and a first storage tank is opened inside the upper side of the sleeve block. The first storage tank is filled with thermal expansion liquid. A piston groove is provided inside the side of the sleeve block near the mounting groove. A fixing component is installed inside the piston groove. The fixing component is used to fix the cutter. The fixing component includes a locking rod that is slidably installed in the piston groove. A locking groove is provided on the outer wall of the cutter at a position corresponding to the locking rod. The locking rod and the locking groove are engaged.

[0007] Furthermore, a connecting groove is provided at one end of the first storage tank near the piston groove. The first storage tank is connected to one side of the piston groove through the connecting groove, and the thermally expanding liquid enters the piston groove through the connecting groove.

[0008] Furthermore, a return spring is fixedly installed at the end of the clamping rod away from the cutter, and the end of the return spring away from the clamping rod is fixedly connected to the inner wall of the piston groove.

[0009] Furthermore, insulating pads are embedded at both the upper and lower ends of the cutter, and the insulating pads are used to isolate the two ends of the wire cut.

[0010] Furthermore, a second storage groove is provided inside the side wall of the protective cover. The second storage groove is filled with dry powder. A push plate is slidably installed on the lower side inside the second storage groove. A push spring is fixedly installed at the lower end of the push plate. The push spring is used to squeeze the push plate, and the push plate is used to squeeze the dry powder.

[0011] Furthermore, a movable groove is provided on the lower side of the inner side of the sleeve block, and multiple discharge ports are provided on the inner wall of the perforation. The discharge ports are connected to the interior of the movable groove, and the interior of the movable groove is connected to the interior of the second storage tank.

[0012] Furthermore, a sealing block is slidably installed inside the movable groove. The sealing block is used to block the discharge port. Multiple guide rods are fixedly installed on the upper end of the sealing block. The upper end of the guide rods extends through the movable groove into the first storage groove. A support spring is sleeved on the outer wall of the guide rod. The support spring is used to compress the guide rod.

[0013] Furthermore, multiple blocking components are installed on the inner wall of the protective cover at positions corresponding to the sleeve block. Each blocking component includes two symmetrically arranged baffles with an "L"-shaped structure. The two ends of the baffles are slidably connected to the protective cover via sliders.

[0014] Furthermore, multiple corrugated pipes are installed between the two opposing baffles. The corrugated pipes are used to drive the two baffles to move. A connecting pipe is installed at the lower end of the corrugated pipe. The connecting pipe extends through the inner wall of the protective cover to the lower side of the second storage tank. A baffle is also installed between the two opposing baffles. One end of the baffle is fixedly connected to one of the baffles, and the baffle is slidably connected to its opposing baffle.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention cuts off faulty cables by using a cutter driven by the thermal expansion liquid to deform under heat. It does not require temperature sensors, electromagnetic circuit breakers or other electrical control components, and does not rely on external control circuit power supply. Even if the switch cabinet is short-circuited or catches fire and causes the control circuit to lose power, the cutting mechanism can still be triggered normally. At the same time, it can respond in real time to the problem of gradual heating and aging of cables, eliminate the defects of delayed response and poor recognition accuracy of electrical control components, and block the risk of continuous heating and fire of cables from the source.

[0016] (2) The present invention can cut off the power supply in conjunction with the cutter when the cable is short-circuited and rapidly heats up and catches fire, and release the dry powder channel by pressing down the sealing block. The stored fire extinguishing dry powder is automatically and accurately sprayed from the cable hole to the fire point. The power cut-off and fire extinguishing actions are linked synchronously to quickly suppress the fire.

[0017] (3) When the baffles are close together, the space around the faulty cable is reduced, the fire extinguishing dry powder is concentrated and covers the fire source, and the dry powder is fully in contact with the burning part, thereby improving the fire extinguishing speed. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the protective cover of the present invention; Figure 3 This is a schematic diagram of the second storage tank portion of the present invention; Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a schematic diagram of the internal structure of the sleeve block of the present invention; Figure 6 This is a schematic diagram of the lever portion of the present invention; Figure 7 This is a schematic diagram of the push plate and the push spring of the present invention; Figure 8 This is a schematic diagram of the structure of the retainer and the corrugated pipe part of the present invention.

[0019] Explanation of the labels in the diagram: 1. Protective cover; 101. Mounting slot; 2. Cutting assembly; 201. Cutting blade; 202. Compression spring; 203. Slot; 204. Insulating pad; 3. Sleeve block; 301. Perforation; 302. First storage tank; 303. Piston groove; 304. Connecting groove; 305. Movable groove; 306. Discharge port; 4. Fixing components; 401. Locking rod; 402. Return spring; 5. Second storage slot; 501. Push plate; 502. Push spring; 6. Sealing block; 601. Guide rod; 602. Support spring; 7. Blocking assembly; 701. Block; 702. Slider; 703. Bellows; 704. Connecting pipe; 705. Baffle. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1 to 8 A protective structure for a high and low voltage switchgear includes a protective cover 1. The inner wall of the protective cover 1 has multiple mounting slots 101. A cutting component 2 is installed inside the mounting slot 101. The cutting component 2 is used to cut off the wires in case of an accident. The cutting component 2 includes a cutter 201 that is slidably installed inside the mounting slot 101. A compression spring 202 is fixedly installed at one end of the cutter 201 inside the mounting slot 101. The end of the compression spring 202 away from the cutter 201 is fixedly connected to the inner wall of the mounting slot 101. A sleeve block 3 is fixedly installed on the inner wall of the protective cover 1 at the position corresponding to the mounting groove 101. A through hole 301 is opened in the middle of the sleeve block 3, and a first storage groove 302 is opened inside the upper side of the sleeve block 3. The first storage groove 302 is filled with thermal expansion liquid. The sleeve block 3 has a piston groove 303 inside on the side near the mounting groove 101. A fixing component 4 is installed inside the piston groove 303. The fixing component 4 is used to fix the cutter 201. The fixing component 4 includes a locking rod 401 that is slidably installed in the piston groove 303. A slot 203 is opened on the outer wall of the cutter 201 at the position corresponding to the locking rod 401. The locking rod 401 and the slot 203 are engaged. A connecting groove 304 is provided at one end of the first storage tank 302 near the piston groove 303. The first storage tank 302 is connected to one side of the inside of the piston groove 303 through the connecting groove 304. The thermally expanding liquid enters the piston groove 303 through the connecting groove 304. A return spring 402 is fixedly installed at the end of the lever 401 away from the cutter 201, and the end of the return spring 402 away from the lever 401 is fixedly connected to the inner wall of the piston groove 303.

[0022] By adopting the above technical solution, during use, the wire is first passed through the through hole 301 on the sleeve block 3. During use, if the wire ages or malfunctions, as the wire temperature slowly rises, the heat can be transferred to the sleeve block 3, and then transferred through the sleeve block 3 to the thermally expanding liquid inside the first storage tank 302, causing the thermally expanding liquid to gradually expand. At this time, the thermally expanding liquid can enter the piston groove 303 through the connecting groove 304, thereby squeezing the locking rod 401, causing the locking rod 401 to move inside the piston groove 303. When the locking rod 401 moves, it can squeeze the return spring 402, causing it to contract. Furthermore, when the locking rod 401 is pushed and moved by the thermally expanding liquid, after the locking rod 401 moves a certain distance... The cutter 201 can disengage from the slot 203. After the lever 401 disengages from the slot 203, the cutter 201 can move under the action of the compression spring 202 to cut the wire, thereby cutting the wire and preventing the wire from continuously operating and causing the temperature to rise, which could lead to a safety accident. When the staff repairs the damaged part of the wire, they first push the cutter 201 to move it into the mounting slot 101, and then repair the damaged part of the wire. After the cutter 201 is pushed back into the mounting slot 101, the position of the slot 203 and the position of the lever 401 will be aligned again. At this time, under the action of the return spring 402, the lever 401 can move back to the initial position and insert into the slot 203, fixing the cutter 201 again.

[0023] Insulating pads 204 are embedded at both the upper and lower ends of the cutter 201. The insulating pads 204 are used to isolate the two ends of the wire cut.

[0024] By adopting the above technical solution, after the cutter 201 cuts the wire, the insulating pad 204 can insulate the part of the wire cut off, thus preventing leakage.

[0025] The protective cover 1 has a second storage tank 5 inside its side wall. The second storage tank 5 is filled with dry powder, which can be ammonium phosphate dry powder. A push plate 501 is slidably installed on the lower side inside the second storage tank 5. A push spring 502 is fixedly installed at the lower end of the push plate 501. The push spring 502 is used to squeeze the push plate 501, and the push plate 501 is used to squeeze the dry powder. The lower side of the inner side of the sleeve block 3 is provided with a movable groove 305, and the inner wall of the through hole 301 is provided with multiple discharge ports 306. The discharge ports 306 are connected to the interior of the movable groove 305, and the interior of the movable groove 305 is connected to the interior of the second storage tank 5. A sealing block 6 is slidably installed inside the movable groove 305. The sealing block 6 is used to block the discharge port 306. Multiple guide rods 601 are fixedly installed on the upper end of the sealing block 6. The upper end of the guide rods 601 extends through the movable groove 305 into the first storage groove 302. A support spring 602 is sleeved on the outer wall of the guide rod 601. The support spring 602 is used to compress the guide rod 601.

[0026] By adopting the above technical solution, when the wire malfunctions and the temperature rises sharply, causing a fire, the thermal expansion liquid in the first storage tank 302 will expand rapidly. At this time, the thermal expansion liquid can squeeze the guide rod 601, causing the sealing block 6 to descend. After the sealing block 6 descends, it no longer blocks the outlet 306. At this time, the push plate 501 rises rapidly under the action of the push spring 502, thereby pushing the dry powder in the second storage tank 5, so that the dry powder enters the movable tank 305 and is then sprayed out from the outlet 306 to extinguish the fire.

[0027] Multiple blocking components 7 are installed on the inner wall of the protective cover 1 at the position corresponding to the sleeve block 3. The blocking components 7 include two symmetrically arranged baffles 701. The baffles 701 have an "L" shaped structure. The two ends of the baffles 701 are slidably connected to the protective cover 1 through sliders 702. Multiple corrugated pipes 703 are installed between two opposing baffles 701. The corrugated pipes 703 are used to drive the two baffles 701 to move. A connecting pipe 704 is installed at the lower end of the corrugated pipe 703. The connecting pipe 704 extends through the inner wall of the protective cover 1 to the lower side of the second storage tank 5. A baffle 705 is also installed between the two opposing baffles 701. One end of the baffle 705 is fixedly connected to one of the baffles 701, and the baffle 705 is slidably connected to its opposing baffle 701.

[0028] By adopting the above technical solution, when the push plate 501 rises, the air pressure between the lower side of the push plate 501 and the second storage tank 5 will decrease, thereby drawing the air in the corrugated pipe 703 into the lower side of the second storage tank 5 through the connecting pipe 704. When the air in the corrugated pipe 703 decreases, the corrugated pipe 703 can contract. When the corrugated pipe 703 contracts, it can simultaneously pull the two baffles 701, thereby bringing the two baffles 701 closer to each other. When the two baffles 701 are close to each other, the space exposed around the damaged wire can be reduced. After the dry powder is sprayed, it can restrict the dry powder, causing it to drift between the two baffles 701, quickly and fully contacting the fire source, improving the protection effect. Among them, after the two baffles 701 are close to each other, the baffle 705 can move accordingly to prevent the flame from burning the corrugated pipe 703.

[0029] Instructions for use: First, pass the wire through the through hole 301 of the inner sleeve block 3 of the protective cover 1. Under normal conditions, the locking rod 401 in the piston groove 303 of the sleeve block 3 is engaged in the slot 203 of the cutter 201 under the action of the return spring 402, fixing the cutter 201, which is compressed by the spring 202, in the mounting groove 101 on the inner wall of the protective cover 1. When the wire ages or malfunctions, causing the temperature to rise slowly, the heat is conducted to the thermally expanding liquid in the first storage tank 302 inside the sleeve block 3, causing it to expand. The liquid enters the piston groove 303 through the connecting groove 304, squeezing the locking rod 401. After overcoming the elasticity of the return spring 402, the locking rod 401 disengages from the slot 203, releasing the lock on the cutter 201. The cutter 201 then releases the spring 202. Under force, the faulty wire is popped out and cut off. At the same time, the insulating pads 204 at the upper and lower ends of the cutter 201 isolate the two ends of the wire cut to prevent leakage and secondary risks. If the wire temperature rises sharply and catches fire, the thermally expanding liquid in the first storage tank 302 expands rapidly, squeezing the guide rod 601 and causing the sealing block 6 to move down to release the blockage of the discharge port 306 on the inner wall of the perforation 301. At the same time, the push plate 501 in the second storage tank 5 on the side wall of the protective cover 1 pushes the ammonium phosphate dry powder upward under the action of the push spring 502, so that the dry powder is sprayed out from the discharge port 306 through the movable tank 305 to extinguish the fire. The upward movement of the push plate 501 will reduce the air pressure below it, and the air in the corrugated pipe 703 will be sucked in through the connecting pipe 704, causing the corrugated pipe 703 to contract and pull the two "L" shapes. The baffles 701 are brought closer together, and the sliding baffles 705 reduce the exposed space around the faulty wire, limit the spread of dry powder, and allow the dry powder to concentrate and contact the fire source to improve the fire extinguishing effect. During maintenance, the cutter 201 is manually pushed back into the mounting slot 101. After the slot 203 and the lever 401 are re-aligned, the reset spring 402 pushes the lever 401 to reset and engage, thus re-fixing the cutter 201 and restoring the equipment's protective function.

[0030] The above are merely preferred embodiments of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A protective structure for a high- and low-voltage switchgear, comprising a protective cover (1), characterized in that: The inner wall of the protective cover (1) is provided with a plurality of mounting slots (101). A cutting assembly (2) is installed inside the mounting slot (101). The cutting assembly (2) is used to cut the wire that has an accident. The cutting assembly (2) includes a cutter (201) that is slidably installed inside the mounting slot (101). A compression spring (202) is fixedly installed at one end of the cutter (201) inside the mounting slot (101). The end of the compression spring (202) away from the cutter (201) is fixedly connected to the inner wall of the mounting slot (101). The inner wall of the protective cover (1) is fixedly installed with a sleeve block (3) at the position corresponding to the mounting groove (101). The sleeve block (3) has a through hole (301) in the middle and a first storage groove (302) is opened inside the upper side of the sleeve block (3). The first storage groove (302) is filled with thermal expansion liquid. The sleeve block (3) has a piston groove (303) inside on the side near the mounting groove (101). A fixing component (4) is installed inside the piston groove (303). The fixing component (4) is used to fix the cutter (201). The fixing component (4) includes a locking rod (401) that is slidably installed in the piston groove (303). A locking groove (203) is opened on the outer wall of the cutter (201) at the position corresponding to the locking rod (401). The locking rod (401) and the locking groove (203) are engaged.

2. The protective structure of a high- and low-voltage switchgear according to claim 1, characterized in that: The first storage tank (302) has a connecting groove (304) at one end near the piston groove (303). The first storage tank (302) is connected to one side of the piston groove (303) through the connecting groove (304). The thermally expanding liquid enters the piston groove (303) through the connecting groove (304).

3. The protective structure of a high- and low-voltage switchgear according to claim 2, characterized in that: A return spring (402) is fixedly installed at the end of the lever (401) away from the cutter (201), and the end of the return spring (402) away from the lever (401) is fixedly connected to the inner wall of the piston groove (303).

4. The protective structure of a high- and low-voltage switchgear according to claim 3, characterized in that: Insulating pads (204) are embedded at both the upper and lower ends of the cutter (201), and the insulating pads (204) are used to isolate the two ends of the wire cut.

5. The protective structure of a high- and low-voltage switchgear according to claim 4, characterized in that: The protective cover (1) has a second storage tank (5) inside its side wall. The second storage tank (5) contains dry powder. A push plate (501) is slidably installed on the lower side of the second storage tank (5). A push spring (502) is fixedly installed at the lower end of the push plate (501). The push spring (502) is used to squeeze the push plate (501). The push plate (501) is used to squeeze the dry powder.

6. The protective structure of a high- and low-voltage switchgear according to claim 5, characterized in that: The lower side of the sleeve block (3) is provided with a movable groove (305), and the inner wall of the perforation (301) is provided with multiple discharge ports (306). The discharge ports (306) are connected to the interior of the movable groove (305), and the interior of the movable groove (305) is connected to the interior of the second storage tank (5).

7. The protective structure of a high- and low-voltage switchgear according to claim 6, characterized in that: A sealing block (6) is slidably installed inside the movable groove (305). The sealing block (6) is used to block the discharge port (306). Multiple guide rods (601) are fixedly installed on the upper end of the sealing block (6). The upper end of the guide rod (601) extends through the movable groove (305) into the first storage groove (302). A support spring (602) is sleeved on the outer wall of the guide rod (601). The support spring (602) is used to squeeze the guide rod (601).

8. The protective structure of a high- and low-voltage switchgear according to claim 7, characterized in that: Multiple blocking components (7) are installed on the inner wall of the protective cover (1) at the position corresponding to the sleeve block (3). The blocking components (7) include two symmetrically arranged baffles (701). The baffles (701) have an "L" shaped structure. The two ends of the baffles (701) are slidably connected to the protective cover (1) through sliders (702).

9. The protective structure of a high- and low-voltage switchgear according to claim 8, characterized in that: Multiple corrugated pipes (703) are installed between two opposing baffles (701). The corrugated pipes (703) are used to drive the two baffles (701) to move. A connecting pipe (704) is installed at the lower end of the corrugated pipes (703). The connecting pipe (704) extends through the inner wall of the protective cover (1) to the lower side of the second storage tank (5). A baffle (705) is also installed between two opposing baffles (701). One end of the baffle (705) is fixedly connected to one of the baffles (701), and the baffle (705) is slidably connected to its opposing baffle (701).

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