A dry air-insulated switchgear with a safety pressure relief channel

Abstract

This utility model belongs to the field of switchgear technology, specifically relating to a dry air-insulated switchgear with a safety pressure relief channel. It includes a switchgear body, at least one vent pipe installed on the rear side of the switchgear body, an exhaust pipe located on the outer side of the vent pipe, and a sealing block slidably connected inside the vent pipe at the junction of the vent pipe and the exhaust pipe. A mounting cover is installed on the outer side of the vent pipe, at the end furthest from the switchgear body from the sealing block, and the interior of the mounting cover is interconnected with the interior of the vent pipe. A rotating disk is installed inside the mounting cover, and multiple springs are installed on the side of the rotating disk near the sealing block, evenly distributed along the edge of the rotating disk. This utility model can adjust the pressure relief threshold of the switchgear according to altitude. At low altitudes, it avoids accidental triggering of the pressure relief valve, reducing dry air leakage and maintenance costs; at high altitudes, it prevents pressure relief lag, avoiding accidents such as cabinet deformation and arc leakage.

Description

Technical Field

[0001] This utility model belongs to the field of switchgear technology, specifically relating to a dry air-insulated switchgear with a safety pressure relief channel. Background Technology

[0002] In power systems, dry air-insulated switchgear with safety pressure relief channels is widely used in power generation, transmission, distribution, and energy conversion and consumption, playing a key role in switching, control, and protection. Compared with traditional switchgear using SF6 as the insulating medium, this type of equipment using dry air insulation has gradually become the mainstream direction in the industry due to its advantages such as environmental protection and low cost. However, when the application scenario involves different altitude regions, the shortcomings of existing switchgear become apparent. In low-altitude areas, atmospheric pressure is high, and the switch cabinet needs to maintain a slightly positive pressure environment to ensure insulation performance. If the pressure relief threshold is not set properly, slight pressure fluctuations caused by changes in ambient temperature during normal operation may lead to the pressure relief valve being triggered erroneously, resulting in dry air leakage. This not only increases maintenance costs but may also reduce the insulation performance of the cabinet due to the intrusion of external moisture. In high-altitude areas, atmospheric pressure drops significantly. When an arc fault occurs inside the cabinet, the pressure difference between the inside and outside decreases, the gas expansion force weakens, and the pressure rise rate inside the cabinet slows down significantly. If the pressure relief valve still uses the fixed threshold design of low-altitude areas, there will be a pressure relief lag problem, causing the pressure inside the cabinet to continue to rise, which may exceed the cabinet's tolerance limit, leading to safety accidents such as cabinet deformation, insulation burnout, or even arc leakage. Currently, existing technologies have significant shortcomings in addressing the above-mentioned problems. Some solutions use pressure relief valves with fixed thresholds. Such designs are mainly suitable for low-altitude and standard atmospheric pressure scenarios, but cannot meet the needs of high-altitude environments. They are difficult to accurately match the actual arc fault pressure in different altitude environments, and are prone to false triggering or delayed triggering. In summary, existing dry air-insulated switchgear with safety pressure relief channels cannot meet the actual needs of complex environments at different altitudes. There is an urgent need for an innovative technical solution that can adjust the pressure resistance according to altitude to ensure that the equipment can operate safely, stably and efficiently under various altitude conditions. Utility Model Content

[0003] The purpose of this invention is to provide a dry air insulated switchgear with a safety pressure relief channel, which can adjust the pressure relief threshold of the switchgear according to the altitude. At low altitudes, it avoids the false triggering of the pressure relief valve to reduce dry air leakage and maintenance costs, while at high altitudes, it prevents pressure relief lag to avoid accidents such as cabinet deformation and arc leakage.

[0004] The specific technical solution adopted by this utility model is as follows: A dry air-insulated switchgear with a safety pressure relief channel includes a switchgear body, at least one vent pipe is installed on the rear side of the switchgear body, an exhaust pipe is provided on the outside of the vent pipe, and a sealing block is slidably connected inside the vent pipe, with the sealing block located at the junction of the vent pipe and the exhaust pipe. An installation cover is installed on the outer side of the vent pipe, at the end of the sealing block away from the switch cabinet body. The interior of the installation cover is in communication with the interior of the vent pipe. A rotating disk is provided inside the installation cover. Multiple springs are installed on the side of the rotating disk near the sealing block, and the multiple springs are evenly distributed at the edge of the rotating disk. An abutment block is fixed to the end of each spring away from the rotating disk, and the abutment block abuts against the sealing block. Each spring has a different elastic coefficient. A drive structure is installed inside the installation cover.

[0005] The drive structure includes a motor, which is installed inside the mounting cover, and the output end of the motor is fixed at the center of the rotating disk.

[0006] Both the abutment block and the sealing block have beveled edges at their respective ends.

[0007] A guide rod is fixed to the side of the abutment block away from the sealing block, and the guide rod is located inside the spring and is slidably connected to the rotating disk.

[0008] The abutment block has balls evenly distributed on the side near the sealing block.

[0009] A blocking ring is fixed inside the sealing block, and the blocking ring is located at the end of the sealing block away from the abutting block, and the blocking ring abuts against the sealing block.

[0010] The outer side of the sealing block is wrapped with a flexible pad, which is made of rubber.

[0011] The technical effects achieved by this utility model are as follows: This invention, through the setting of a motor, enables the output end of the motor to drive the rotating disk and multiple springs to rotate, thereby adjusting the pressure relief threshold of the switch cabinet according to the altitude. At low altitudes, it avoids the false triggering of the pressure relief valve to reduce dry air leakage and maintenance costs, while at high altitudes, it prevents pressure relief lag to avoid accidents such as cabinet deformation and electric arc leakage, ensuring that the equipment can operate safely and stably at different altitudes. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure between the switch cabinet body, the vent pipe, and the exhaust pipe in this utility model; Figure 3 This is a schematic diagram of the structure between the vent pipe, the exhaust pipe, and the mounting cover in this utility model; Figure 4 This is a cross-sectional view of the vent pipe in this utility model; Figure 5 This is a schematic diagram of the structure between the motor, spring and sealing block in this utility model.

[0013] The attached diagram lists the components represented by each number as follows: 1. Switch cabinet body; 2. Vent pipe; 3. Exhaust pipe; 4. Ball bearing; 5. Sealing block; 6. Mounting cover; 7. Motor; 8. Rotating disc; 9. Spring; 10. Abutment block; 11. Inclined surface; 12. Guide rod; 13. Blocking ring. Detailed Implementation

[0014] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0015] like Figures 1-5 As shown, a dry air insulated switchgear with a safety pressure relief channel includes a switchgear body 1. At least one vent pipe 2 is installed on the rear side of the switchgear body 1. An exhaust pipe 3 is provided on the outer side of the vent pipe 2. A sealing block 5 is slidably connected inside the vent pipe 2, and the sealing block 5 is located at the junction of the vent pipe 2 and the exhaust pipe 3, so that the sealing block 5 can seal the junction of the vent pipe 2 and the exhaust pipe 3 to prevent the dry air inside the switchgear body 1 from leaking. In addition, a flexible pad made of rubber is wrapped around the outer side of the sealing block 5, so that the sealing block 5 can better seal the junction of the vent pipe 2 and the exhaust pipe 3. A mounting cover 6 is installed on the outer side of the vent pipe 2, at the end of the sealing block 5 away from the switch cabinet body 1. The interior of the mounting cover 6 is interconnected with the interior of the vent pipe 2. A rotating disk 8 is installed inside the mounting cover 6. Multiple springs 9 are installed on the side of the rotating disk 8 near the sealing block 5, and the multiple springs 9 are evenly distributed at the edge of the rotating disk 8. An abutment block 10 is fixed to the end of each spring 9 away from the rotating disk 8, and the abutment block 10 abuts against the sealing block 5. Each spring 9 has a different elastic coefficient. A driving structure is installed inside the mounting cover 6, see attached diagram. Figures 4-5 The drive structure includes a motor 7, which is installed inside the mounting cover 6. The output end of the motor 7 is fixed at the center of the rotating disk 8. When the rotating disk 8 rotates, it can be driven by the motor 7, thereby causing the output end of the motor 7 to drive the rotating disk 8 to rotate. A protective shell is installed on the outside of the motor 7 to improve the service life of the motor 7. Dry air is introduced into the switch cabinet body 1 to protect the wires and electrical components inside the switch cabinet body 1. When a circuit breaker occurs inside the switch cabinet body 1, high-temperature and high-pressure gas is generated instantly. At this time, the gas pressure inside the switch cabinet body 1 increases instantly, which pushes the sealing block 5. When the sealing block 5 moves, it compresses the spring 9, thereby connecting the vent pipe 2 and the exhaust pipe 3. The high-temperature and high-pressure gas is guided through the vent pipe 2 into the exhaust pipe 3 and then introduced into the outside of the switch cabinet body 1 through the exhaust pipe 3, thereby discharging the gas. Multiple vent pipes 2 can be set on the switch cabinet body 1 to discharge the generated high-temperature and high-pressure gas more quickly. Furthermore, through the setting of the drive structure, the rotating disk 8 can rotate, and each rotation will contact a different spring 9 and sealing block 5. When the switch cabinet body 1 is in a high-altitude area, the external atmospheric pressure is low. Due to the small pressure difference between the inside and outside, the gas expansion force is weak. When an electric arc fault occurs, the pressure rise rate inside the switch cabinet body 1 will be slower. When the rotation reaches one of the springs 9 with a lower elastic coefficient and contacts the sealing block 5, the spring 9 with a lower elastic coefficient is more easily deformed. Therefore, it is not necessary to have a higher internal pressure to trigger pressure relief, thus avoiding cabinet deformation, insulation burnout, or even electric arc leakage. If the switch cabinet body 1 is located in a low-altitude area, it will rotate until a spring 9 with a high elastic coefficient contacts the sealing block 5. Because the spring 9 with a high elastic coefficient is not easily deformed, it avoids accidental triggering, which would cause the dry gas inside the switch cabinet body 1 to escape.

[0016] See attached document Figure 5 Both the abutment block 10 and the sealing block 5 have inclined surfaces 11 at their respective edges. When one of the abutment blocks 10 rotates to contact the sealing block 5, the inclined surfaces 11 make it easier for the abutment block 10 to rotate to contact the sealing block 5, preventing them from jamming. A guide rod 12 is fixed to the side of the abutment block 10 away from the sealing block 5. The guide rod 12 is located inside the spring 9 and is slidably connected to the rotating disk 8. The guide rod 12 allows the spring 9 to be compressed along the straight line of the guide rod 12 when compressed, thus enabling the spring 9 to... Furthermore, the abutment block 10 is evenly provided with ball bearings 4 on the side near the sealing block 5. The ball bearings 4 ensure that the abutment block 10 contacts the sealing block 5 and that the abutment block 10 moves effectively. In addition, a blocking ring 13 is fixed inside the sealing block 5 and is located at the end of the sealing block 5 away from the abutment block 10. The blocking ring 13 abuts against the sealing block 5. The blocking ring 13 can block the sealing block 5 and prevent the sealing block 5 from moving towards the switch cabinet body 1 inside the vent pipe 2.

[0017] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A dry air-insulated switchgear with a safety pressure relief channel, comprising a switchgear body (1), characterized in that: At least one vent pipe (2) is installed on the rear side of the switch cabinet body (1), and an exhaust pipe (3) is provided on the outside of the vent pipe (2). A sealing block (5) is slidably connected inside the vent pipe (2), and the sealing block (5) is located at the junction of the vent pipe (2) and the exhaust pipe (3). An installation cover (6) is installed on the outside of the vent pipe (2) and at the end of the sealing block (5) away from the switch cabinet body (1). The interior of the installation cover (6) is connected to the interior of the vent pipe (2). A rotating disk (8) is provided inside the installation cover (6). Multiple springs (9) are installed on the side of the rotating disk (8) near the sealing block (5). The multiple springs (9) are evenly distributed at the edge of the rotating disk (8). An abutment block (10) is fixed to the end of the spring (9) away from the rotating disk (8). The abutment block (10) abuts against the sealing block (5). The elastic coefficient of each spring (9) is different. A drive structure is installed inside the installation cover (6).

2. The dry air-insulated switchgear with a safety pressure relief channel according to claim 1, characterized in that: The drive structure includes a motor (7), which is installed inside the mounting cover (6). The output end of the motor (7) is fixed at the center of the rotating disk (8).

3. A dry air-insulated switchgear with a safety pressure relief channel according to claim 2, characterized in that: Both the abutment block (10) and the sealing block (5) have inclined surfaces (11) at their respective edges close to each other.

4. A dry air-insulated switchgear with a safety pressure relief channel according to claim 2, characterized in that: The abutment block (10) is fixed with a guide rod (12) on the side away from the sealing block (5), and the guide rod (12) is located inside the spring (9), and the guide rod (12) is slidably connected to the rotating disk (8).

5. A dry air-insulated switchgear with a safety pressure relief channel according to claim 2, characterized in that: The abutment block (10) is provided with balls (4) evenly distributed on the side near the sealing block (5).

6. A dry air-insulated switchgear with a safety pressure relief channel according to claim 1, characterized in that: The sealing block (5) has a blocking ring (13) fixed inside, and the blocking ring (13) is located at the end of the sealing block (5) away from the abutment block (10), and the blocking ring (13) abuts against the sealing block (5).

7. A dry air-insulated switchgear with a safety pressure relief channel according to claim 1, characterized in that: The outer side of the sealing block (5) is wrapped with a flexible pad, which is made of rubber.

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