A pressure relief device for explosion-proof distribution cabinet

Abstract

This utility model discloses a pressure relief device for an explosion-proof power distribution cabinet, relating to the field of power distribution cabinet pressure relief technology. It includes a housing, a threaded seat fixedly installed on the outer side of the housing, and a mounting cover threaded onto the outer side of the threaded seat. A pressure relief chamber is formed inside the top of the housing, and a pressure relief channel is formed inside the housing below the pressure relief chamber. A movable plate is movably installed inside the pressure relief chamber, and a sealing piston is fixedly installed in the middle of the bottom of the movable plate. The sealing piston cooperates with the pressure relief channel. Limiting holes are formed on both sides of the pressure relief channel inside the housing. Two limiting rods are fixedly installed at the bottom of the movable plate. The advantages of this utility model are: through the arrangement of the threaded seat, mounting cover, pressure relief channel, movable plate, sealing piston, guide rod, spring, and guide hole, the spring can be quickly and conveniently disassembled and replaced, facilitating overall maintenance.

Description

Technical Field

[0001] This utility model relates to the field of pressure relief technology for power distribution cabinets, specifically a pressure relief device for explosion-proof power distribution cabinets. Background Technology

[0002] The explosion-proof principle of positive pressure explosion-proof distribution cabinets mainly adopts the explosion-proof measure of isolating the ignition source by medium. All electrical components of the user are installed in a shell filled with a pressurized clean medium, so that flammable and explosive gas mixtures in the external environment cannot come into contact with the electric sparks or dangerous temperatures generated by the electrical components during normal operation, thereby achieving the purpose of electrical explosion protection.

[0003] Currently, the reset mechanism in existing distribution cabinet pressure relief devices uses springs for reset. However, with the increase in usage time and pressure relief frequency, the springs will experience metal fatigue and will no longer be able to effectively perform the reset function. They need to be disassembled and replaced to restore their pressure relief function. The replacement of springs in existing distribution cabinet pressure relief devices is inconvenient, which has certain shortcomings. Therefore, we propose a pressure relief device for explosion-proof distribution cabinets. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a pressure relief device for explosion-proof distribution cabinets, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pressure relief device for an explosion-proof distribution cabinet, comprising a housing, a threaded seat fixedly installed on the outer side of the housing, an installation cover threadedly installed on the outer side of the threaded seat, a pressure relief chamber opened inside the top of the housing, a pressure relief channel opened inside the housing below the pressure relief chamber, a movable plate movably installed inside the pressure relief chamber, a sealing piston fixedly installed in the middle of the bottom of the movable plate, the sealing piston cooperating with the pressure relief channel, limit holes opened on both sides of the pressure relief channel inside the housing, two limit rods fixedly installed at the bottom of the movable plate, a limit slider fixedly installed at one end of the limit rod extending into the limit hole, a guide rod fixedly installed in the middle of the top of the movable plate, a spring provided on the outer side of the guide rod, a guide hole opened inside the top of the installation cover, the guide rod slidably connected to the guide hole, several pressure relief grooves opened inside the top of the installation cover, and a sealing ring provided at the bottom of the installation cover, the sealing ring cooperating with the housing.

[0006] Preferably, a plurality of mounting rods are fixedly mounted on the top of the mounting cover, a top plate is fixedly mounted on one end of each mounting rod, an alarm is provided on the top of the top plate, a control box is provided on the bottom of the top plate, a time delay switch is provided on the bottom of the control box, and the guide rod cooperates with the time delay switch.

[0007] Preferably, a limiting ring is fixedly installed on the outer side of the bottom of the threaded seat, and the mounting cover cooperates with the limiting ring.

[0008] Preferably, the movable plate cooperates with the spring, and the spring cooperates with the mounting cover.

[0009] Preferably, the interior of the pressure relief groove is provided with a fire-resistant mesh.

[0010] Preferably, the limiting slider is slidably connected to the inner wall of the limiting hole.

[0011] This utility model provides a pressure relief device for explosion-proof distribution cabinets, which has the following beneficial effects:

[0012] 1. The pressure relief device for this explosion-proof distribution cabinet, through the setting of threaded seat, mounting cover, pressure relief channel, movable plate, sealing piston, guide rod, spring and guide hole, allows for quick and convenient disassembly and replacement of the spring, facilitating the overall maintenance operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a cross-sectional view of the present invention;

[0015] Figure 3 This is a schematic diagram of the spring disassembly of this utility model;

[0016] Figure 4 This utility model Figure 2 Enlarged view of point A in the image;

[0017] Figure 5 This utility model Figure 2 Enlarged view of point B in the image.

[0018] In the diagram: 1. Housing; 2. Threaded seat; 3. Mounting cover; 4. Pressure relief chamber; 5. Pressure relief channel; 6. Movable plate; 7. Sealing piston; 8. Limiting hole; 9. Limiting rod; 10. Limiting slider; 11. Guide rod; 12. Spring; 13. Guide hole; 14. Pressure relief groove; 15. Sealing ring; 16. Mounting rod; 17. Top plate; 18. Alarm; 19. Control box; 20. Time delay switch; 21. Limiting ring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Please see Figures 1 to 5This utility model provides a technical solution: a pressure relief device for an explosion-proof distribution cabinet, comprising a housing 1, the housing 1 being installed in a pressure relief hole on the top of the explosion-proof distribution cabinet, a threaded seat 2 being fixedly installed on the outer side of the housing 1, an installation cover 3 being threadedly installed on the outer side of the threaded seat 2, a limit ring 21 being fixedly installed on the outer side of the bottom of the threaded seat 2, the installation cover 3 cooperating with the limit ring 21, a pressure relief chamber 4 being opened inside the top of the housing 1, a pressure relief channel 5 being opened inside the housing 1 below the pressure relief chamber 4, a movable plate 6 being movably installed inside the pressure relief chamber 4, a sealing piston 7 being fixedly installed in the middle of the bottom of the movable plate 6, the sealing piston 7 cooperating with the pressure relief channel 5, and the pressure relief channel 5 being located on both sides inside the housing 1. Each of the movable plates 6 has a limiting hole 8. Two limiting rods 9 are fixedly installed at the bottom of the movable plate 6. One end of the limiting rod 9 extends into the interior of the limiting hole 8 and a limiting slider 10 is fixedly installed therein. The limiting slider 10 is slidably connected to the inner wall of the limiting hole 8. A guide rod 11 is fixedly installed in the middle of the top of the movable plate 6. A spring 12 is provided on the outside of the guide rod 11. The movable plate 6 cooperates with the spring 12. The spring 12 cooperates with the mounting cover 3. A guide hole 13 is opened inside the top of the mounting cover 3. The guide rod 11 is slidably connected to the guide hole 13. Several pressure relief grooves 14 are opened inside the top of the mounting cover 3. A fireproof mesh is provided inside the pressure relief grooves 14. A sealing ring 15 is provided at the bottom of the mounting cover 3. The sealing ring 15 cooperates with the housing 1.

[0021] Several mounting rods 16 are fixedly installed on the top of the mounting cover 3. A top plate 17 is fixedly installed on one end of the mounting rod 16. An alarm 18 is installed on the top of the top plate 17. A control box 19 is installed at the bottom of the top plate 17. A time delay switch 20 is installed at the bottom of the control box 19. The guide rod 11 cooperates with the time delay switch 20. The control box 19 is existing technology. When the time delay switch 20 is triggered, the pressure inside the distribution cabinet is too high and it cannot reset for a long time, or the spring 12 is metal fatigued and cannot rebound, and the time the time delay switch 20 is pressed exceeds the normal pressure relief time, the alarm 18 will be activated to indicate that the pressure inside the distribution cabinet is too high or that the spring 12 is metal fatigued and cannot rebound, prompting the staff to handle the situation.

[0022] In summary, the pressure relief device used in this explosion-proof distribution cabinet works as follows: when the pressure inside the distribution cabinet is too high, the pressure will push the sealed piston 7 out of the pressure relief channel 5, allowing the pressurized gas to be discharged through the pressure relief chamber 4 and the pressure relief groove 14. When the movable plate 6 moves upward, it squeezes the spring 12, and at the same time, the guide rod 11 pushes up and contacts the time delay switch 20. When the spring 12 experiences metal fatigue and the pressure inside the distribution cabinet reaches the threshold pressure, the time delay switch 20 continues to release pressure. After being squeezed for a long time, exceeding the pressing time threshold set by the control box 19, the alarm 18 will be activated to indicate that the spring 12 has experienced metal fatigue, prompting the staff to replace the spring 12. When replacing the spring 12, it is only necessary to rotate the mounting cover 3 to unscrew it from the outside of the threaded seat 2, and then the spring 12 can be removed from the outside of the guide rod 11 for replacement. The overall replacement is convenient and quick.

[0023] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pressure relief device for an explosion-proof distribution cabinet, comprising a housing (1), characterized in that: A threaded seat (2) is fixedly installed on the outer side of the housing (1), and an installation cover (3) is threadedly installed on the outer side of the threaded seat (2). A pressure relief chamber (4) is opened inside the top of the housing (1). A pressure relief channel (5) is opened inside the housing (1) and below the pressure relief chamber (4). A movable plate (6) is movably installed inside the pressure relief chamber (4). A sealing piston (7) is fixedly installed in the middle of the bottom of the movable plate (6). The sealing piston (7) cooperates with the pressure relief channel (5). Limiting holes (8) are opened inside the housing (1) and on both sides of the pressure relief channel (5). Two limiting rods (9) are fixedly installed at the bottom of the movable plate (6). One end of the limiting rod (9) extends into the limiting hole (8) and a limiting slider (10) is fixedly installed inside. A guide rod (11) is fixedly installed in the middle of the top of the movable plate (6). A spring (12) is provided on the outside of the guide rod (11). A guide hole (13) is opened inside the top of the mounting cover (3). The guide rod (11) is slidably connected to the guide hole (13). Several pressure relief grooves (14) are opened inside the top of the mounting cover (3). A sealing ring (15) is provided at the bottom of the mounting cover (3). The sealing ring (15) cooperates with the housing (1).

2. The pressure relief device for an explosion-proof distribution cabinet according to claim 1, characterized in that: The top of the mounting cover (3) is fixedly installed with several mounting rods (16), and a top plate (17) is fixedly installed at one end of the mounting rod (16). An alarm (18) is provided on the top of the top plate (17), and a control box (19) is provided at the bottom of the top plate (17). A delay switch (20) is provided at the bottom of the control box (19), and the guide rod (11) cooperates with the delay switch (20).

3. The pressure relief device for an explosion-proof distribution cabinet according to claim 1, characterized in that: A limiting ring (21) is fixedly installed on the outer side of the bottom of the threaded seat (2), and the mounting cover (3) cooperates with the limiting ring (21).

4. The pressure relief device for an explosion-proof distribution cabinet according to claim 1, characterized in that: The movable plate (6) is engaged with the spring (12), and the spring (12) is engaged with the mounting cover (3).

5. A pressure relief device for an explosion-proof distribution cabinet according to claim 1, characterized in that: The pressure relief groove (14) is equipped with a fire-resistant mesh inside.

6. The pressure relief device for an explosion-proof distribution cabinet according to claim 1, characterized in that: The limiting slider (10) is slidably connected to the inner wall of the limiting hole (8).

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