An explosion-proof pressure relief electric control box

Abstract

An explosion-proof pressure relief electric control box includes a box body, a pressure relief device, a water curtain spray device and a travel switch. The pressure relief device includes an exhaust hood and a cover plate. The box body is connected to the atmosphere through the exhaust hood. The end of the exhaust hood with a smaller diameter is closed by the cover plate. The interior of the exhaust hood is connected to the interior of the box body. The exhaust hood and the cover plate are connected by low-strength airtight welding. The water curtain spray device includes a water storage tank and multiple water mist spray ports. The water outlet of the water storage tank is connected to the water inlet of the multiple water mist spray ports. The air inlet of the water mist spray port is connected to the air outlet of the compressed air source through an air pipe. The multiple water mist spray ports are all arranged directly opposite to the outlet of the exhaust hood. The contact rod of the travel switch is matched with the cover plate in transmission. The travel switch controls the compressed air source to start working. This design can not only discharge the high-temperature and high-pressure gas generated by the electrical explosion in the electric control box through the pressure relief device, but also reduce its temperature through the water curtain spray device, effectively reducing the secondary hazards of the electrical explosion.

Description

Technical Field

[0001] The present invention relates to an electrical control box, in particular to an explosion-proof pressure relief electrical control box, which is specifically suitable for an electrical control cabinet which discharges explosive gas through a pressure relief device to reduce explosion hazards. Background Art

[0002] An electrical control box is a device that assembles switchgear, measuring instruments, protective electrical appliances and auxiliary equipment in a closed or semi-closed metal cabinet or on a screen according to electrical wiring requirements. It is widely used in the field of electrical connection.

[0003] At present, in the field of electrical equipment, accidents of equipment damage caused by electrical explosions due to breakdown or short circuit of high-voltage components in electrical control boxes occur from time to time. In practical applications, in order to reduce the hazards of electrical explosions in electrical control boxes, it is usually achieved by improving the internal structural strength of the box, controlling the impact of the explosion within the box, thereby avoiding the impact of the accident involving the external environment and causing secondary accidents.

[0004] Although this method can avoid the hazards caused by electrical explosions to a certain extent, it still has the following defects:

[0005] 1. Since it is difficult to accurately estimate the explosion energy, the most extreme data that may exist in theory is usually used for estimation. This will cause the strength of the control box to far exceed its actual requirements, and its weight will also increase significantly, increasing the production cost.

[0006] 2. Installing automatic fire-fighting facilities near risky equipment increases the cost of configuring the electrical control cabinet. Summary of the invention

[0007] The purpose of the present invention is to overcome the disadvantages in the prior art that the strength of the explosion-proof electric control box far exceeds the actual demand, resulting in cost waste, and to provide an electric control box that reduces explosion hazards through a pressure relief device.

[0008] To achieve the above objectives, the technical solution of the present invention is:

[0009] An explosion-proof pressure relief electric control box, the electric control box comprising: a box body, a pressure relief device, a water curtain spray device and a travel switch; the pressure relief device is fixedly arranged on the opposite side of the box door on the box body, the water curtain spray device is fixedly arranged on the top of the box body, the pressure relief device comprises an exhaust hood and a cover plate, the exhaust hood is a funnel structure, the end of the exhaust hood with a larger diameter passes through the side wall of the box body and is connected to the box body as a whole, the end of the exhaust hood with a smaller diameter is closed by the cover plate, the interior of the exhaust hood is connected to the interior of the box body, and the exhaust hood and the cover plate are connected by a low-strength airtight welding The water curtain spray device is fixedly arranged on the box body, and the water curtain spray device includes a water storage tank and a plurality of water mist spray ports. The water outlet of the water storage tank is connected with the water inlet of the plurality of water mist spray ports. The air inlet of the plurality of water mist spray ports is connected with the air outlet of the compressed air source through the air pipe. The plurality of water mist spray ports are evenly arranged on the outer wall of the exhaust hood, and the plurality of water mist spray ports are arranged directly opposite to the outlet of the exhaust hood. The travel switch is arranged on the exhaust hood, the touch rod of the travel switch is matched with the cover plate transmission, and the signal output end of the travel switch is connected with the signal input end of the compressed air source.

[0010] The pressure relief device includes an exhaust hood, a cover plate and an annular plate. The exhaust hood is a funnel structure. The end of the exhaust hood with a larger diameter passes through the side wall of the box body and is connected to the box body as a whole. An annular plate is fixedly provided on the inner circumference of the end of the exhaust hood with a smaller diameter. The middle part of the annular plate is closed by the cover plate, and the annular plate and the cover plate are welded with low-strength airtight welding.

[0011] Corresponding grooves are arranged on the inner circumference of the annular plate and the outer circumference of the cover plate.

[0012] The inner ring diameter of the annular plate near the box body is D, the inner ring diameter of the annular plate far from the box body is D, the inner ring diameter of the cover plate near the box body is d, and the inner ring diameter of the cover plate far from the box body is d, wherein d>D>d>D.

[0013] The angle of the groove is 45° to 60°.

[0014] The electric control box also includes a controller and a solenoid valve. The controller is fixedly arranged in the box body, and the solenoid valve is fixedly arranged on the top of the box body. The water inlet of the solenoid valve is connected with the water outlet of the water tank through a water pipe, and the water outlet of the solenoid valve is connected with multiple water mist injection ports through a water pipe. The start signal output end of the controller is connected with the start signal input end of the solenoid valve, the working signal output end of the controller is connected with the working signal input end of the compressed air source, and the travel signal output end of the travel switch is connected with the travel signal input end of the controller.

[0015] The water tank is a pressure water tank, the interior of which is divided into upper and lower spaces by a partition, the top of the partition is elastically connected to the water tank by a spring, the space below the partition is a water storage area, and the water storage area is connected to each water mist injection port through multiple water pipes.

[0016] The electric control box also includes a main power supply, and the power-off signal output end of the controller is connected to the main power supply.

[0017] The compressed gas provided by the compressed gas source is nitrogen or carbon dioxide.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The pressure relief device of an explosion-proof pressure relief electric control box of the present invention is fixedly arranged on the box body, and the pressure relief device includes an exhaust hood and a cover plate. The interior of the box body is connected to the atmosphere through the exhaust hood, and the exhaust hood is closed by the cover plate. The exhaust hood and the cover plate are connected by low-strength airtight welding. A travel switch is fixedly arranged on the exhaust hood, and the touch rod of the travel switch is matched with the cover plate in transmission. A plurality of water mist injection ports are evenly arranged on the exhaust hood, and each water mist injection port is arranged directly opposite to the outlet of the exhaust hood. The water outlet of the water storage tank is connected to the water inlet of the plurality of water mist injection ports, and the air inlet of the plurality of water mist injection ports is connected to the compressed air through the air pipe. The air outlet of the source is connected, and the signal output end of the travel switch is connected to the signal input end of the compressed air source. Since the ring plate and the cover plate are welded with low-strength airtight welding, the strength of which is lower than that of the box body itself, when an electrical explosion occurs in the electric control box, the connection between the ring plate and the cover plate will be destroyed first. At this time, the cover plate triggers the travel switch, and the travel switch sends a signal to the compressed air source to drive the compressed air source to start working. The compressed gas output by the compressed air source drives the liquid in the water storage tank to be sprayed out from each water mist spray port to form a conical water curtain. The temperature of the high-temperature and high-pressure gas in the electric control box decreases after passing through the conical water curtain. Therefore, this design can discharge the high-temperature and high-pressure gas generated by the electrical explosion in the electric control box through the pressure relief device, and reduce its temperature through the water curtain spray device, effectively reducing the secondary hazards of the electrical explosion and effectively improving the safety of the use of the electric control box.

[0020] 2. The exhaust hood in an explosion-proof pressure relief electric control box of the present invention is a funnel structure, and an annular plate is fixedly arranged on the inner circumference of the end with a smaller diameter of the exhaust hood, and the middle part of the annular plate is closed by a cover plate, and the annular plate and the cover plate are welded by low-strength airtight welding, and corresponding grooves are arranged on the inner circumference of the annular plate and the outer circumference of the cover plate, and the inner ring diameter of the annular plate near the box body side is D1, and the inner ring diameter of the annular plate far from the box body side is D2, and the inner ring diameter of the cover plate near the box body side is d1, and the inner ring diameter of the cover plate far from the box body 1 side is d2, wherein d2>D2>d1>D1, and the angle of the groove is 45°~60°, so that the cover plate can be partially embedded in the annular plate, and the area of ​​the cover plate exposed outside the annular plate forms a construction groove, which can be conveniently welded by low-strength airtight welding. Therefore, a construction groove that is convenient for processing is formed between the annular plate and the cover plate of this design, which effectively reduces the processing difficulty of the pressure relief device.

[0021] 3. The explosion-proof pressure relief electric control box of the present invention also includes a controller and a solenoid valve. The water inlet of the solenoid valve is connected to the water outlet of the water storage tank through a water pipe, and the water outlet of the solenoid valve is connected to multiple water mist injection ports through a water pipe. The start signal output end of the controller is connected to the start signal input end of the solenoid valve, the working signal output end of the controller is connected to the working signal input end of the compressed air source, and the travel signal output end of the travel switch is connected to the travel signal input end of the controller, so that when the travel switch is triggered, the controller can start the solenoid valve and the compressed air source, thereby generating a water curtain. Therefore, the design can control the solenoid valve and the compressed air source through the controller, effectively improving the degree of automation of the system.

[0022] 4. The explosion-proof pressure relief electric control box of the present invention also includes a main power supply. When the travel switch is triggered, the controller can send a signal to cut off the main power supply to avoid further damage caused by the current after the explosion. At the same time, the compressed gas provided by the compressed gas source is nitrogen or carbon dioxide, which can have a certain inhibitory effect on the flame generated by the explosion. Therefore, this design can prevent further damage caused by the current after the explosion by cutting off the main power supply, and at the same time produce a water curtain through high-pressure nitrogen or carbon dioxide, effectively improving the explosion-proof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 It is a rear view of the present invention.

[0025] Figure 3 yes Figure 1 Schematic diagram of the structure of the pressure relief device.

[0026] Figure 4 yes Figure 1 Schematic diagram of the structure of the middle ring plate.

[0027] Figure 5 yes Figure 1 Schematic diagram of the structure of the middle cover.

[0028] Figure 6 It is a structural schematic diagram of the present invention in a working state.

[0029] Figure 7 It is a pipeline connection diagram of the present invention.

[0030] In the figure: box body 1, pressure relief device 2, exhaust hood 21, cover plate 22, annular plate 23, groove 24, water curtain spray device 3, water storage tank 31, water mist spray port 32, travel switch 4, controller 5, solenoid valve 6. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] See also Figures 1 to 7 The electric control box includes: a box body 1, a pressure relief device 2, a water curtain spray device 3 and a travel switch 4; the pressure relief device 2 is fixedly arranged on the opposite side of the box door on the box body 1, and the water curtain spray device 3 is fixedly arranged on the top of the box body 1. The pressure relief device 2 includes an exhaust hood 21 and a cover plate 22. The exhaust hood 21 is a funnel structure. The end of the exhaust hood 21 with a larger diameter passes through the side wall of the box body 1 and is connected to the box body 1 as a whole. The end of the exhaust hood 21 with a smaller diameter is closed by the cover plate 22. The interior of the exhaust hood 21 is connected to the interior of the box body 1. The exhaust hood 21 and the cover plate 22 are connected by low-strength airtight welding. The water curtain spray device 3 is fixedly arranged on the box body 1, and the water curtain spray device 3 includes a water storage tank 31 and a plurality of water mist spray ports 32. The water outlet of the water storage tank 31 is connected with the water inlet of the plurality of water mist spray ports 32, and the air inlet of the plurality of water mist spray ports 32 is connected with the air outlet of the compressed air source through an air pipe. The plurality of water mist spray ports 32 are evenly arranged on the outer wall of the exhaust hood 21, and the plurality of water mist spray ports 32 are arranged directly opposite to the outlet of the exhaust hood 21. The travel switch 4 is arranged on the exhaust hood 21, and the touch rod of the travel switch 4 is in transmission cooperation with the cover plate 22, and the signal output end of the travel switch 4 is connected with the signal input end of the compressed air source.

[0033] The pressure relief device 2 includes an exhaust hood 21, a cover plate 22 and an annular plate 23. The exhaust hood 21 is a funnel structure. The end of the exhaust hood 21 with a larger diameter passes through the side wall of the box body 1 and is connected to the box body 1 as a whole. An annular plate 23 is fixedly provided on the inner circumference of the end of the exhaust hood 21 with a smaller diameter. The middle part of the annular plate 23 is closed by the cover plate 22. The annular plate 23 and the cover plate 22 are welded by low-strength airtight welding.

[0034] Corresponding grooves 24 are provided on the inner circumference of the annular plate 23 and the outer circumference of the cover plate 22 .

[0035] The inner ring diameter of the annular plate 23 near the box body 1 is D1, the inner ring diameter of the annular plate 23 far from the box body 1 is D2, the inner ring diameter of the cover plate 22 near the box body 1 is d1, the inner ring diameter of the cover plate 22 far from the box body 1 is d2, wherein d2>D2>d1>D1.

[0036] The angle of the groove 24 is 45° to 60°.

[0037] The electric control box also includes a controller 5 and a solenoid valve 6. The controller 5 is fixedly arranged in the box body 1, and the solenoid valve 6 is fixedly arranged on the top of the box body 1. The water inlet of the solenoid valve 6 is connected with the water outlet of the water tank 31 through a water pipe, and the water outlet of the solenoid valve 6 is connected with multiple water mist injection ports 32 through a water pipe. The opening signal output end of the controller 5 is connected with the opening signal input end of the solenoid valve 6, the working signal output end of the controller 5 is connected with the working signal input end of the compressed air source, and the travel signal output end of the travel switch 4 is connected with the travel signal input end of the controller 5.

[0038] The water tank 31 is a pressure water tank, and the interior of the water tank 31 is divided into upper and lower spaces by a partition. The top of the partition is elastically connected to the water tank 31 through a spring, and the space below the partition is a water storage area, which is connected to each water mist injection port 32 through a plurality of water pipes.

[0039] The electric control box also includes a main power supply, and the power-off signal output terminal of the controller 5 is connected to the main power supply.

[0040] The compressed gas provided by the compressed gas source is nitrogen or carbon dioxide.

[0041] The principle of the present invention is described as follows:

[0042] When an electrical explosion occurs in the box body 1, the connection between the cover plate 22 and the annular plate 23 becomes a weak stress point in the electric control box. The cover plate 22 falls off the annular plate 23 before the box body 1 is damaged. The travel switch 4 is triggered by the cover plate 22 and transmits a signal to the controller 5. The controller 5 drives the solenoid valve 6 and the compressed air source to start working. The compressed gas and the liquid in the water tank 31 enter the water mist injection port 32 to start spraying water mist. The water mist forms a conical water curtain covering the pressure relief outlet of the exhaust hood 21. The high-temperature gas generated by the explosion in the box body 1 drops in temperature after passing through the water curtain, thereby reducing the risk of secondary disasters caused by the explosion.

[0043] Embodiment 1:

[0044] An explosion-proof pressure relief electric control box, the electric control box comprising: a box body 1, a pressure relief device 2, a water curtain spray device 3 and a travel switch 4; the pressure relief device 2 is fixedly arranged on the opposite side of the box door on the box body 1, the water curtain spray device 3 is fixedly arranged on the top of the box body 1, the pressure relief device 2 comprises an exhaust hood 21 and a cover plate 22, the exhaust hood 21 is a funnel structure, the end of the exhaust hood 21 with a larger diameter passes through the side wall of the box body 1 and is connected to the box body 1 as a whole, the end of the exhaust hood 21 with a smaller diameter is closed by the cover plate 22, the interior of the exhaust hood 21 is connected to the interior of the box body 1, the exhaust hood 21 and the cover plate 22 are connected by low-strength airtight welding, the water curtain spray device 3 is fixed It is arranged on the box body 1, and the water curtain spray device 3 includes a water tank 31 and a plurality of water mist spray ports 32. The water outlet of the water tank 31 is connected with the water inlet of the plurality of water mist spray ports 32, and the air inlet of the plurality of water mist spray ports 32 is connected with the air outlet of the compressed air source through the air pipe. The plurality of water mist spray ports 32 are evenly arranged on the outer wall of the exhaust hood 21, and the plurality of water mist spray ports 32 are arranged directly opposite to the outlet of the exhaust hood 21. The travel switch 4 is arranged on the exhaust hood 21, and the touch rod of the travel switch 4 is in transmission cooperation with the cover plate 22, and the signal output end of the travel switch 4 is connected with the signal input end of the compressed air source; the pressure relief device 2 includes the exhaust hood 21, the cover plate 22 and the annular plate 23, and the The exhaust hood 21 is a funnel structure. The end of the exhaust hood 21 with a larger diameter passes through the side wall of the box body 1 and is connected to the box body 1 as a whole. An annular plate 23 is fixedly arranged on the inner circumference of the end of the exhaust hood 21 with a smaller diameter. The middle part of the annular plate 23 is closed by a cover plate 22. The annular plate 23 and the cover plate 22 are welded with low-strength airtight welding. Corresponding grooves 24 are arranged on the inner circumference of the annular plate 23 and the outer circumference of the cover plate 22. The inner ring diameter of the annular plate 23 near the box body 1 is D1, and the inner ring diameter of the annular plate 23 far from the box body 1 is D2. The inner ring diameter of the cover plate 22 near the box body 1 is d1, and the inner ring diameter of the cover plate 22 far from the box body 1 is d2. d2>D2>d1>D1; the angle of the groove 24 is 45°~60°; the electric control box also includes a controller 5 and a solenoid valve 6, the controller 5 is fixedly arranged in the box body 1, the solenoid valve 6 is fixedly arranged on the top of the box body 1, the water inlet of the solenoid valve 6 is connected with the water outlet of the water storage tank 31 through a water pipe, the water outlet of the solenoid valve 6 is connected with a plurality of water mist injection ports 32 through a water pipe, the opening signal output end of the controller 5 is connected with the opening signal input end of the solenoid valve 6, the working signal output end of the controller 5 is connected with the working signal input end of the compressed air source, and the travel signal output end of the travel switch 4 is connected with the travel signal input end of the controller 5.

[0045] Embodiment 2:

[0046] Embodiment 2 is substantially the same as Embodiment 1, except that:

[0047] The water tank 31 is a pressure water tank, and the interior of the water tank 31 is divided into upper and lower spaces by a partition. The top of the partition is elastically connected to the water tank 31 through a spring, and the space below the partition is a water storage area, which is connected to each water mist injection port 32 through a plurality of water pipes.

[0048] Embodiment 3:

[0049] Embodiment 3 is substantially the same as Embodiment 2, except that:

[0050] The electric control box also includes a main power supply, and the power-off signal output end of the controller 5 is connected to the main power supply; the compressed gas provided by the compressed gas source is nitrogen or carbon dioxide.

Claims

1. An explosion-proof pressure relief electric control box, characterized in that: The electric control box comprises: a box body (1), a pressure relief device (2), a water curtain spray device (3) and a travel switch (4); the pressure relief device (2) is fixedly arranged on the opposite side of the box door of the box body (1), the water curtain spray device (3) is fixedly arranged on the top of the box body (1), the pressure relief device (2) comprises an exhaust hood (21) and a cover plate (22), the exhaust hood (21) is a funnel structure, the end of the exhaust hood (21) with a larger diameter passes through the side wall of the box body (1) and is connected to the box body (1) as a whole, the end of the exhaust hood (21) with a smaller diameter is closed by the cover plate (22), the interior of the exhaust hood (21) is connected to the interior of the box body (1), and the exhaust hood (21) and the cover plate (22) are connected by low-strength airtight welding. The water curtain spray device (3) is fixedly arranged on the box body (1), and comprises a water storage tank (31) and a plurality of water mist spray ports (32). The water outlet of the water storage tank (31) is connected to the water inlet of the plurality of water mist spray ports (32), and the air inlet of the plurality of water mist spray ports (32) is connected to the air outlet of the compressed air source through an air pipe. The plurality of water mist spray ports (32) are evenly arranged on the outer wall of the exhaust hood (21), and the plurality of water mist spray ports (32) are arranged directly opposite to the outlet of the exhaust hood (21). The travel switch (4) is arranged on the exhaust hood (21), and the contact rod of the travel switch (4) is in driving cooperation with the cover plate (22), and the signal output end of the travel switch (4) is connected to the signal input end of the compressed air source.

2. The explosion-proof pressure relief electric control box according to claim 1, characterized in that: The pressure relief device (2) comprises an exhaust hood (21), a cover plate (22) and an annular plate (23); the exhaust hood (21) is a funnel structure; an end of the exhaust hood (21) with a larger diameter passes through a side wall of the box body (1) and is connected to the box body (1) as a whole; an annular plate (23) is fixedly provided on the inner circumference of an end of the exhaust hood (21) with a smaller diameter; a middle portion of the annular plate (23) is closed by the cover plate (22); and the annular plate (23) and the cover plate (22) are connected by low-strength airtight welding.

3. The explosion-proof pressure relief electric control box according to claim 2, characterized in that: Corresponding grooves (24) are provided on the inner circumference of the annular plate (23) and the outer circumference of the cover plate (22).

4. The explosion-proof pressure relief electric control box according to claim 3 is characterized in that: The inner ring diameter of the annular plate (23) on the side close to the casing (1) is D1, the inner ring diameter of the annular plate (23) on the side far from the casing (1) is D2, the inner ring diameter of the cover plate (22) on the side close to the casing (1) is d1, and the inner ring diameter of the cover plate (22) on the side far from the casing (1) is d2, wherein d2>D2>d1>D1.

5. The explosion-proof pressure relief electric control box according to claim 4, characterized in that: The angle of the groove (24) is 45° to 60°.

6. An explosion-proof pressure relief electric control box according to any one of claims 1 to 5, characterized in that: The electric control box further comprises a controller (5) and a solenoid valve (6); the controller (5) is fixedly arranged in the box body (1); the solenoid valve (6) is fixedly arranged at the top of the box body (1); the water inlet of the solenoid valve (6) is connected to the water outlet of the water storage tank (31) through a water pipe; the water outlet of the solenoid valve (6) is connected to a plurality of water mist injection ports (32) through a water pipe; the start signal output end of the controller (5) is connected to the start signal input end of the solenoid valve (6); the working signal output end of the controller (5) is connected to the working signal input end of the compressed air source; and the travel signal output end of the travel switch (4) is connected to the travel signal input end of the controller (5).

7. The explosion-proof pressure relief electric control box according to claim 6, characterized in that: The water storage tank (31) is a pressure water storage tank. The interior of the water storage tank (31) is divided into an upper space and a lower space by a partition. The top of the partition is elastically connected to the water storage tank (31) by a spring. The space below the partition is a water storage area. The water storage area is connected to each water mist injection port (32) via a plurality of water pipes.

8. The explosion-proof pressure relief electric control box according to claim 6, characterized in that: The electric control box also includes a main power supply, and the power-off signal output terminal of the controller (5) is connected to the main power supply.

9. The explosion-proof pressure relief electric control box according to claim 1, characterized in that: The compressed gas provided by the compressed gas source is nitrogen or carbon dioxide.

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