High-voltage switch cabinet with explosion-proof and fire-proof functions

Abstract

This invention relates to the technical field of switchgear. In particular, it relates to a high-voltage switchgear with explosion-proof and fire-resistant functions, comprising a housing; a box fixedly connected to the cabinet; a first bent plate slidably connected within the box; several L-shaped plates fixedly connected within the box, with the first bent plate slidably connected to the L-shaped plates; and a second bent plate fixedly connected to each L-shaped plate. The first bent plate, serving as a pressure relief structure, mechanically triggers the dry powder extinguishing operation, allowing explosion-proof and fire-resistant operations to proceed simultaneously without independent electronic control, significantly improving stability and safety. Furthermore, the first bent plate also compresses gas to lift the dry powder extinguishing agent, increasing its coverage area and enhancing the fire-resistant effect. By setting the rated flow rate of the first check valve to be greater than that of the second check valve, the compressed gas can be slowly discharged, allowing for sustained long-term extinguishing operations in conjunction with the dry powder extinguishing agent, preventing secondary combustion.

Description

Technical Field

[0001] This invention relates to the technical field of switchgear. More specifically, this invention relates to a high-voltage switchgear with explosion-proof and fire-resistant functions. Background Technology

[0002] If an internal arc fault occurs in a high-voltage switchgear during operation, it can easily ignite the insulation material, leading to spontaneous combustion. Simultaneously, the arc instantly heats the surrounding air, causing it to expand rapidly from room temperature. Because the gas expansion rate far exceeds the exhaust capacity of the cabinet's vents, the heat and pressure cannot be released in time, resulting in an adiabatic compression effect inside the cabinet, causing a sudden pressure surge and creating a strong risk of explosion. To address this hazard, existing technology proposes high-voltage switchgear with explosion-proof and fire-resistant functions, incorporating internal pressure relief and dry powder fire extinguishing systems. However, these two protective structures are typically controlled by two independent electrical control systems. In actual emergency situations, the high temperature, strong electromagnetic interference, and severe vibration accompanying the arc fault can significantly reduce the stability of the electrical control systems. If either system fails to trigger properly, the pressure relief or fire extinguishing function will fail, and the high voltage and combustion inside the cabinet cannot be effectively suppressed, potentially leading to a major safety accident and posing a significant safety hazard. Summary of the Invention

[0003] To overcome the shortcomings of existing switchgear where the pressure relief structure and dry powder fire extinguishing structure are controlled separately by independent electrical control systems, resulting in relatively low stability of the electrical control systems and potential safety hazards in emergency situations, this invention provides a high-voltage switchgear with explosion-proof and fire-resistant functions.

[0004] Technical Solution: A high-voltage switchgear with explosion-proof and fire-resistant functions includes a cabinet and a cabinet door; the cabinet door is rotatably connected to the cabinet; it also includes a box, a first bent plate, an L-shaped plate, a second bent plate, a first check valve, a second check valve, and fixing components; the box is fixedly connected to the cabinet; the first bent plate is slidably connected to the box in a sealed manner; several L-shaped plates are fixedly connected to the box, and the first bent plate is slidably connected to the L-shaped plates in a sealed manner; a second bent plate is fixedly connected to each L-shaped plate; several first check valves are threaded through the upper part of each L-shaped plate; and a second check valve is installed under each L-shaped plate. Each part is equipped with several one-way valves II; the flow rate of one-way valve I is greater than that of one-way valve II; a cavity I is formed between the box body, the bent plate I, and the L-shaped plate; a cavity II is formed between the box body, the corresponding L-shaped plate, and the corresponding bent plate II; a cavity III is formed between the L-shaped plate and the corresponding bent plate II; an opening is provided on the L-shaped plate; cavity I is connected to the corresponding cavity II through one-way valve I; cavity III is connected to the corresponding opening; several heat dissipation holes are provided on the cabinet body; a fixing component is connected to the cabinet body, and the fixing component is used to fix the cabinet door.

[0005] As an improvement to the above solution, the fixing component includes a first connecting block, a second connecting block, and a pin; the first connecting block is fixedly connected to the cabinet body; the second connecting block is fixedly connected to the cabinet door; the pin is plugged into the first connecting block, and the pin is plugged into the second connecting block.

[0006] The present invention achieves a fixing effect by adopting the above structure.

[0007] As an improvement to the above solution, a filter screen is also included; several filter screens are detachably connected to the cabinet at the positions corresponding to the heat dissipation holes.

[0008] By employing the above-described structure, this invention achieves the interception effect.

[0009] As an improvement to the above solution, an auxiliary component is also included, which includes a toggle block and a drive component; several toggle blocks are slidably connected to each L-shaped plate; a drive component is connected to the L-shaped plate, which is used to drive the toggle blocks to move up and down.

[0010] As an improvement to the above solution, the drive assembly includes a spring telescopic rod, a connecting block three, and a magnet; several spring telescopic rods are fixedly attached to each L-shaped plate; a connecting block three is fixedly attached to each lever, and the connecting block three is fixedly connected to the telescopic end of the corresponding spring telescopic rod; the connecting block three is made of steel; several magnets are fixedly attached to the bending plate one, and the magnets are in contact with the corresponding L-shaped plate.

[0011] As an improvement to the above scheme, the connecting blocks are counted from front to back. Odd-numbered connecting blocks are connected to one elastic telescopic rod, and even-numbered connecting blocks are connected to two elastic telescopic rods.

[0012] As an improvement to the above scheme, it also includes protrusions; several protrusions are fixed to the underside of each lever.

[0013] By employing the above-described structure, the present invention achieves a pressure-resistant effect.

[0014] As an improvement to the above solution, a smoke sensor is also included; a smoke sensor is installed inside the cabinet.

[0015] As an improvement to the above solution, a pressure sensor is also included; a pressure sensor is installed inside the box.

[0016] As an improvement to the above solution, a transparent panel is also included; a transparent panel is fixed to the cabinet door.

[0017] By adopting the above structure, the present invention makes it easy to observe the effect.

[0018] Beneficial effects: First, the bending plate, as a pressure relief structure, mechanically triggers the dry powder extinguishing operation, allowing explosion-proof and fire-prevention operations to be carried out simultaneously without the need for independent electronic control, greatly improving stability and safety. Furthermore, the bending plate also compresses gas to lift the dry powder extinguishing agent, increasing its coverage area and improving the fire prevention effect. Moreover, by setting the rated flow rate of the one-way valve to be greater than that of the one-way valve, the compressed gas can be slowly discharged, allowing for continuous long-term extinguishing operations in conjunction with the dry powder extinguishing agent, avoiding secondary combustion and ensuring high safety.

[0019] Second, during the pressure relief and buffering operation of the bending plate moving upward, the lever can also be driven to move up and down reciprocatingly. This causes the lever to move the dry powder extinguishing agent in the opening, enhancing its fluidity and preventing blockage. This ensures that the fire extinguishing operation can proceed normally. At the same time, the lever used to prevent blockage also allows the dry powder flowing out of the opening to be distributed more widely in the left and right directions, so that the dry powder extinguishing agent can more fully cover the electrical components inside the cabinet, thereby improving the fire extinguishing effect.

[0020] Third, by setting different numbers of elastic telescopic rods on adjacent levers, the movement frequency of adjacent levers is different, so that the opening can always discharge dry powder extinguishing agent to ensure the timeliness of fire extinguishing operation.

[0021] Fourth, the protrusions limit the movement of the push block to prevent it from pressing the dry powder extinguishing agent into a hardened state, thus avoiding any impact on the fire extinguishing operation. Attached Figure Description

[0022] Figure 1 This shows a first-view structural schematic diagram of the high-voltage switchgear with explosion-proof and fire-resistant functions according to the present invention;

[0023] Figure 2 This diagram shows a second perspective view of the high-voltage switchgear with explosion-proof and fire-resistant functions according to the present invention.

[0024] Figure 3 The present invention is shown. Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 A schematic diagram of the smoke sensor of the present invention is shown;

[0026] Figure 5 A schematic diagram of the pressure sensor of the present invention is shown;

[0027] Figure 6 A schematic diagram of the structure of the bending plate of the present invention is shown;

[0028] Figure 7 The diagram shows the structure of the second bending plate, the first check valve, and the second check valve of the present invention.

[0029] Figure 8 A schematic diagram of the structure of the auxiliary component of the present invention is shown;

[0030] Figure 9 A schematic diagram of the protrusion of the present invention is shown.

[0031] The labels in the diagram are as follows: 1-Cabinet body, 2-Cabinet door, 3-Box body, 4-Bent plate one, 5-L-shaped plate, 6-Bent plate two, 7-One-way valve one, 8-One-way valve two, 201-Connecting block one, 202-Connecting block two, 203-Pin, 204-Filter screen, 205-Pulley, 206-Elastic telescopic rod, 207-Connecting block three, 208-Magnet, 209-Protrusion, 2010-Smoke sensor, 2011-Pressure sensor, 2012-Transparent plate, 491-Cavity one, 492-Cavity two, 493-Cavity three, 494-Opening, 495-Heat dissipation hole. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1: A high-voltage switchgear with explosion-proof and fire-resistant functions, such as... Figures 1-9 As shown, the system includes a cabinet body 1 and a cabinet door 2 rotatably connected to the cabinet body 1, and a box body 3, which is fixedly connected to the cabinet body 1. A first bent plate 4 is slidably connected to the box body 3 in a sealed manner, and several L-shaped plates 5 are fixedly connected to the box body 3. The first bent plate 4 and the L-shaped plates 5 are slidably connected in a sealed manner. A second bent plate 6 is fixedly connected to each L-shaped plate 5. Several first one-way valves 7 are inserted through the upper part of each L-shaped plate 5, and several second one-way valves 8 are inserted through the lower part of each L-shaped plate 5. The flow rate of the first one-way valves 7 is greater than the flow rate of the second one-way valves 8. The box body 3 and the first bent plate 4... A cavity 491 is formed between the box body 3, the corresponding L-shaped plate 5, and the corresponding bent plate 6; a cavity 492 is formed between the box body 3, the corresponding L-shaped plate 5, and the corresponding bent plate 6; a cavity 493 is formed between the L-shaped plate 5 and the corresponding bent plate 6; an opening 494 is provided on the L-shaped plate 5; the cavity 491 is connected to the corresponding cavity 492 through a one-way valve 7; the cavity 493 is connected to the corresponding opening 494; a plurality of heat dissipation holes 495 are provided on the cabinet body 1; a fixing component is connected to the cabinet body 1, and the fixing component is used to fix the cabinet door 2.

[0034] The fixing components include connecting block 1 201, connecting block 202 and pin 203; connecting block 1 201 is welded on the cabinet body 1; connecting block 202 is welded on the cabinet door 2; pin 203 is plugged and pulled together between connecting block 1 201 and connecting block 202.

[0035] It also includes a filter screen 204; two filters screens 204 are detachably connected to the cabinet body 1 at the position corresponding to the heat dissipation hole 495, and the filters screens 204 intercept impurities.

[0036] When an electrical component in cabinet 1 malfunctions and causes an abnormal electric arc, the arc instantly heats the surrounding air, causing it to expand rapidly. This results in a sharp increase in air pressure in the space below bending plate 4, which in turn pushes bending plate 4 upwards, increasing the volume of the space below it and thus achieving a pressure relief and buffering effect. Simultaneously, the electrical control center detects the abnormality in the internal electrical components of cabinet 1 and immediately cuts off power to prevent further arcing. In other words, the pressure rise in the space below bending plate 4 will only occur briefly (the arc will disappear immediately after it occurs). After this pressure relief and buffering, the gas in the space below bending plate 4 is discharged to the outside through the heat dissipation vent 495, and then normal operation is restored. The pressure is maintained to achieve an explosion-proof effect. After the bending plate 4 moves upward, it stops sealing the opening 494. The bending plate 4 is in a sealed sliding connection with the box 3 and the L-shaped plate 5. That is, a rubber sealing strip is provided on the outside of the bending plate 4, so that frictional resistance is formed between the bending plate 4 and the box 3 and the L-shaped plate 5. This prevents the bending plate 4 from sliding down after the pressure in the space below the bending plate 4 returns to normal, so that the opening 494 is in a normally open state. This allows the dry powder extinguishing agent that was originally located in the cavity 493 to flow out from the opening 494 and cover the electrical components in the cabinet 1, achieving a fireproof effect. During this process, the bending plate 4, as a pressure relief structure, mechanically triggers the dry powder extinguishing agent. The dry powder extinguishing operation requires no electronic components, significantly improving stability and safety. When the bending plate 4 moves upward, it compresses the gas in cavity 491, causing it to flow into cavity 492 through check valve 7. Simultaneously, some air in cavity 492 flows out through check valve 8. The small rated flow rate of check valve 8 results in a small flow rate of air flowing down from check valve 8 to the bottom of bending plate 4, thus not affecting the pressure relief and buffering operation of bending plate 4. After the gas is ejected from check valve 8, it will lift the dry powder extinguishing agent flowing out of opening 494, increasing the coverage area and improving the fire prevention effect. Meanwhile, the rated flow rate of check valve 7... The flow rate is greater than the rated flow rate of the one-way valve 8. That is, during the pressure relief process on the bending plate 4, the inflow rate of the air in cavity 492 is greater than the outflow rate, which causes the air pressure in cavity 492 to rise. As a result, cavity 492 remains under high pressure after the buffer pressure relief operation is completed. Subsequently, the gas in cavity 492 will slowly flow out from the one-way valve 8. With the help of dry powder extinguishing agent, it can continue to carry out fire extinguishing operation for a long time, avoiding secondary combustion and ensuring strong safety. Afterwards, the pin 203 is manually removed from the connecting block 201 and the connecting block 202, so that the pin 203 stops fixing the connecting block 201 and the connecting block 202. Then, the cabinet door 2 is opened to maintain the components in the cabinet 1.In use, the bending plate 4, acting as a pressure relief structure, mechanically triggers the dry powder extinguishing operation, allowing explosion-proof and fire-prevention operations to proceed simultaneously without the need for independent electronic control, significantly improving stability and safety. Furthermore, the bending plate 4 also compresses gas to lift the dry powder extinguishing agent, increasing its coverage area and enhancing the fire-prevention effect. Moreover, by setting the rated flow rate of the one-way valve 7 to be greater than that of the one-way valve 8, the compressed gas can be slowly discharged, allowing for sustained, prolonged extinguishing operations in conjunction with the dry powder extinguishing agent, preventing secondary combustion and ensuring high safety.

[0037] It also includes auxiliary components, which include toggle blocks 205 and drive components; nine toggle blocks 205 are slidably connected to each L-shaped plate 5; and drive components are connected to the L-shaped plate 5.

[0038] The drive assembly includes a spring telescopic rod 206, a connecting block 207, and a magnet 208; several spring telescopic rods 206 are bolted to each L-shaped plate 5; a connecting block 207 is fixed to each lever 205, and the connecting block 207 is fixed to the telescopic end of the corresponding spring telescopic rod 206; the connecting block 207 is made of steel; two magnets 208 are bolted to the bending plate 4, and the magnets 208 are in contact with the corresponding L-shaped plate 5.

[0039] During the pressure relief and buffering process, the bending plate 4 drives the magnet 208 to move upward. The magnet 208, through magnetic force, drives the connecting block 207 to move upward, compressing the elastic telescopic rod 206. The connecting block 207 drives the lever 205 to move upward. The magnet 208 continues to move upward away from the connecting block 207, so that no longer a magnetic force is generated between the connecting block 207 and the magnet 208. At this time, the elastic telescopic rod 206 rebounds, causing the lever 205 and the connecting block 207 to move downward. Then, the lever 205 and the connecting block 207 stretch the elastic telescopic rod 206 through inertial force. The retracting rod 206 rebounds again, causing the lever 205 and connecting block 207 to move upwards. This reciprocating motion causes the lever 205 to move up and down, thereby moving the dry powder extinguishing agent in the opening 494, enhancing its fluidity, preventing blockage, and ensuring the normal operation of the fire extinguishing operation. During use, when the bending plate 4 moves upwards for pressure relief and buffering, it can also drive the lever 205 to move up and down, causing the lever 205 to move the dry powder extinguishing agent in the opening 494, enhancing its fluidity, preventing blockage, and ensuring the normal operation of the fire extinguishing operation.

[0040] After setting the toggle block 205, it will close and open the opening 494. During the closing and opening of the opening 494, the flow rate of the dry powder extinguishing agent changes. When the flow rate is high, the dry powder can move to the area closer to the center of the cabinet 1. When the flow rate is low, the dry powder can move to the position closer to the left and right sides of the cabinet 1. The flow rate changes relatively linearly, which allows the dry powder flowing out of the opening 494 to be more widely distributed in the left and right directions, so that the dry powder extinguishing agent can more fully cover the electrical components in the cabinet 1, thereby improving the extinguishing effect. When in use, the toggle block 205, which is used to prevent blockage, can also make the dry powder flowing out of the opening 494 more widely distributed in the left and right directions, so that the dry powder extinguishing agent can more fully cover the electrical components in the cabinet 1, thereby improving the extinguishing effect.

[0041] Count the connecting blocks 3 207 from front to back. Odd-numbered connecting blocks 3 207 are connected to one elastic telescopic rod 206, and even-numbered connecting blocks 3 207 are connected to two elastic telescopic rods 206.

[0042] If all the levers 205 move synchronously, the opening 494 will be unable to discharge dry powder extinguishing agent for nearly half the time during the fire extinguishing process, thus affecting the timeliness of the fire extinguishing operation. Therefore, the connecting blocks 207 are counted from front to back. One elastic telescopic rod 206 is set on the odd-numbered connecting blocks 207, and two elastic telescopic rods 206 are set on the even-numbered connecting blocks 207. This makes the initial elastic force on adjacent levers 205 different, thus making the movement frequency of adjacent levers 205 different, so that the opening 494 can always discharge dry powder extinguishing agent, ensuring the timeliness of the fire extinguishing operation. In use, by setting different numbers of elastic telescopic rods 206 on adjacent levers 205, the movement frequency of adjacent levers 205 is made different, so that the opening 494 can always discharge dry powder extinguishing agent, ensuring the timeliness of the fire extinguishing operation.

[0043] It also includes protrusions 209; two protrusions 209 are welded to the underside of each paddle 205.

[0044] When the lever 205 moves downward and presses against the L-shaped plate 5, it will cause the dry powder extinguishing agent below it to clump together, resulting in insufficient dispersion of the dry powder extinguishing agent and a decrease in its extinguishing effect. Therefore, a protrusion 209 is provided on the lever 205. When the lever 205 moves downward, it drives the protrusion 209 downward, so that the protrusion 209 contacts the L-shaped plate 5. At this time, a gap is formed between the lower side of the lever 205 and the L-shaped plate 5, which will not cause the dry powder extinguishing agent to clump together, thus avoiding affecting the extinguishing. During use, the protrusion 209 limits the lever 205 to prevent the lever 205 from clumping the dry powder extinguishing agent, thus avoiding affecting the extinguishing operation.

[0045] Example 2

[0046] Based on Example 1, such as Figure 2 , Figure 4 and Figure 5 As shown, it also includes a smoke sensor 2010; a smoke sensor 2010 is installed inside the cabinet 1 to monitor the fire situation.

[0047] It also includes a pressure sensor 2011; the pressure sensor 2011 is installed inside the housing 3.

[0048] It also includes a transparent panel 2012; the transparent panel 2012 is fixed to the cabinet door 2, and staff can observe the inside of the cabinet 1 through the transparent panel 2012.

[0049] During the depressurization process, the bending plate 4 moves upward and contacts the pressure sensor 2011, causing the pressure sensor 2011 to monitor the pressure data. Together with the smoke sensor 2010 and the electrical control center, they can detect abnormalities in the electrical components inside the cabinet 1, preventing misjudgments caused by single-mode monitoring.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-voltage switchgear with explosion-proof and fire-resistant functions, comprising a cabinet body (1); a cabinet door (2) is rotatably connected to the cabinet body (1); characterized in that: It also includes a box (3); the box (3) is fixedly connected to the cabinet (1); a bent plate (4) is sealed and slidably connected inside the box (3); several L-shaped plates (5) are fixedly connected inside the box (3), and the bent plate (4) and the L-shaped plate (5) are sealed and slidably connected; a bent plate (6) is fixedly connected to each L-shaped plate (5); several one-way valves (7) are installed on the upper part of each L-shaped plate (5); several one-way valves (8) are installed on the lower part of each L-shaped plate (5); the flow rate of the one-way valve (7) is greater than the flow rate of the one-way valve (8); between the box (3), the bent plate (4) and the L-shaped plate (5) A cavity is formed (491); a cavity is formed between the box body (3), the corresponding L-shaped plate (5) and the corresponding bent plate (6) (492); a cavity is formed between the L-shaped plate (5) and the corresponding bent plate (6) (493); an opening (494) is provided on the L-shaped plate (5); the cavity is connected to the corresponding cavity (492) through a one-way valve (7); the cavity is connected to the corresponding opening (494); a number of heat dissipation holes (495) are provided on the cabinet body (1); a fixing component is connected to the cabinet body (1), and the fixing component is used to fix the cabinet door (2).

2. A high-voltage switchgear with explosion-proof and fire-resistant functions according to claim 1, characterized in that: The fixing components include a first connecting block (201), a second connecting block (202), and a pin (203); the first connecting block (201) is fixedly connected to the cabinet body (1); the second connecting block (202) is fixedly connected to the cabinet door (2); the pin (203) is plugged into the first connecting block (201), and the pin (203) is plugged into the second connecting block (202).

3. A high-voltage switchgear with explosion-proof and fire-resistant functions according to claim 2, characterized in that: It also includes a filter screen (204); several filters screens (204) are detachably connected to the cabinet (1) at the position corresponding to the heat dissipation hole (495).

4. A high-voltage switchgear with explosion-proof and fire-resistant functions according to claim 2, characterized in that: It also includes auxiliary components, including a toggle block (205) and a drive component; several toggle blocks (205) are slidably connected on each L-shaped plate (5); the drive component is connected to the L-shaped plate (5) and is used to drive the toggle blocks (205) to move up and down.

5. A high-voltage switchgear with explosion-proof and fire-resistant functions according to claim 4, characterized in that: The drive assembly includes a spring telescopic rod (206), a connecting block three (207), and a magnet (208); several spring telescopic rods (206) are fixedly attached to each L-shaped plate (5); a connecting block three (207) is fixedly attached to each lever (205), and the connecting block three (207) is fixedly attached to the telescopic end of the corresponding spring telescopic rod (206); the connecting block three (207) is made of steel; several magnets (208) are fixedly attached to the bending plate one (4), and the magnets (208) are in contact with the corresponding L-shaped plate (5).

6. A high-voltage switchgear with explosion-proof and fire-resistant functions according to claim 5, characterized in that: Count the connecting blocks (207) from front to back. Odd-numbered connecting blocks (207) are connected to one elastic telescopic rod (206), and even-numbered connecting blocks (207) are connected to two elastic telescopic rods (206).

7. A high-voltage switchgear with explosion-proof and fire-resistant functions according to claim 6, characterized in that: It also includes protrusions (209); each paddle (205) has several protrusions (209) fixed to its underside.

8. A high-voltage switchgear with explosion-proof and fire-resistant functions according to claim 7, characterized in that: It also includes a smoke sensor (2010); a smoke sensor (2010) is installed on the inside of the cabinet (1).

9. A high-voltage switchgear with explosion-proof and fire-resistant functions according to claim 8, characterized in that: It also includes a pressure sensor (2011); a pressure sensor (2011) is installed inside the housing (3).

10. A high-voltage switchgear with explosion-proof and fire-resistant functions according to any one of claims 1-9, characterized in that: It also includes a transparent panel (2012); a transparent panel (2012) is fixed to the cabinet door (2).

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