An SF6 gas-insulated ring main unit

Abstract

This utility model discloses an SF6 gas-insulated ring main unit, including a cabinet, side plates on both sides of the cabinet, and a gas box installed on the cabinet. A vent is provided at the bottom of the gas box, and an explosion-proof valve is installed at the vent. A diaphragm is provided in the middle of the explosion-proof valve, and a sealing ring is provided between the explosion-proof valve and the gas box. A gas collecting hopper is installed at the bottom of the explosion-proof valve, and a spiral tube is connected to the bottom of the gas collecting hopper. A gas cylinder is located inside the cabinet, and a one-way valve is installed on the gas cylinder. A three-way valve is installed at one end of the spiral tube, and an exhaust connector is provided at one end of the three-way valve. This utility model, through the gas collecting hopper, spiral tube, three-way valve, one-way valve, and gas cylinder, can collect and store the gas released from the gas box, preventing it from leaking to the outside and affecting the health of workers. Furthermore, residual gas in the gas box can be extracted through the exhaust connector, ensuring that the gas in the gas box is completely emptied, facilitating subsequent disassembly and maintenance of the gas box.

Description

Technical Field

[0001] This utility model relates to the field of ring main unit technology, specifically an SF6 gas-insulated ring main unit. Background Technology

[0002] SF6 gas-insulated ring main unit is a power distribution device that uses SF6 gas as the insulation and arc-extinguishing medium. It is mainly used in the ring power supply system of urban power distribution network to realize the segmentation, connection and protection of power lines. Its high-voltage live parts and switching elements are sealed in a stainless steel gas box filled with SF6 gas to achieve full insulation and full enclosure.

[0003] Existing SF6 gas-insulated ring main units have explosion-proof valves installed at the bottom of the gas tank. When the pressure inside the gas tank rises to a level exceeding the set threshold due to an internal fault, the explosion-proof valve will open to release the pressure in time, preventing the gas tank from exploding due to excessive pressure. However, SF6 gas will decompose and produce toxic gases under high temperature or electric arc. After the explosion-proof valve opens to release the pressure, it will be directly discharged to the outside, which can easily affect the health of the staff. Utility Model Content

[0004] The purpose of this utility model is to provide an SF6 gas-insulated ring main unit to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an SF6 gas-insulated ring main unit, comprising a cabinet, side panels on both sides of the cabinet, and a gas box mounted on the cabinet. The gas box has a vent at its bottom, and an explosion-proof valve is installed at the vent. A diaphragm is located in the middle of the explosion-proof valve, and a sealing ring is provided between the explosion-proof valve and the gas box. A gas collecting hopper is installed at the bottom of the explosion-proof valve, and a spiral tube is connected to the bottom of the gas collecting hopper. A gas cylinder is located inside the cabinet, and a one-way valve is installed on the gas cylinder. A three-way valve is installed at one end of the spiral tube, and an exhaust connector is provided at one end of the three-way valve. A connecting groove is provided at the bottom of the explosion-proof valve, and a connecting part that mates with the connecting groove is integrally formed on the top of the gas collecting hopper. A sealing gasket is provided between the connecting part and the explosion-proof valve.

[0006] In a preferred embodiment of this utility model, the output end of the one-way valve is connected to the gas cylinder via a pipe, and the input end of the one-way valve is connected to the three-way valve via a pipe.

[0007] As a preferred embodiment of this utility model, the bottom of the air box is provided with a plurality of screws distributed in an annular pattern along the edge of the vent, and the outer side of the screws is threaded with nuts.

[0008] As a preferred embodiment of this utility model, the explosion-proof valve, the connecting part, and the sealing gasket are all provided with through holes corresponding to the screw.

[0009] As a preferred embodiment of this utility model, the gas cylinder is provided with a clamp on the outside, and the two ends of the clamp are connected to the cabinet.

[0010] Compared with the prior art, the beneficial effects of this utility model are: this utility model can collect and store the gas released from the gas box by setting up a gas collecting hopper, spiral tube, three-way valve, one-way valve and gas cylinder, preventing it from leaking to the outside and affecting the health of the staff. In addition, the gas remaining in the gas box can be extracted through the exhaust connector to ensure that the gas in the gas box is completely discharged, so as to facilitate the subsequent disassembly and maintenance of the gas box. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0012] Figure 2 This is a schematic diagram of the structure of the side plate of this utility model after disassembly;

[0013] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle;

[0014] Figure 4 This is a schematic diagram of the structure of the connecting part, the gas collecting hopper, and the spiral tube of this utility model;

[0015] Figure 5 This is a schematic diagram of the explosion-proof valve of this utility model;

[0016] Figure 6 This is a schematic diagram of the bottom structure of the explosion-proof valve of this utility model;

[0017] Figure 7 This is a schematic diagram of the structure of the sealing gasket of this utility model;

[0018] Figure 8 This is a schematic diagram of the structure of the air box of this utility model.

[0019] In the diagram: 1. Cabinet; 2. Side panel; 3. Gas box; 4. Gas cylinder; 5. One-way valve; 6. Three-way valve; 7. Clamp; 8. Spiral tube; 9. Gas collection hopper; 10. Screw; 11. Nut; 12. Explosion-proof valve; 13. Connecting part; 14. Through hole; 15. Connecting groove; 16. Exhaust connector; 17. Diaphragm; 18. Sealing gasket; 19. Vent; 20. Sealing ring. Detailed Implementation

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

[0021] Please see Figures 1 to 8 This utility model provides a technical solution: an SF6 gas-insulated ring main unit, including a cabinet 1, side plates 2 disposed on both sides of the cabinet 1, and a gas box 3 installed on the cabinet 1. A vent 19 is provided at the bottom of the gas box 3, and an explosion-proof valve 12 is installed at the vent 19. A diaphragm 17 is provided in the middle of the explosion-proof valve 12. When the pressure inside the gas box 3 rises above a set threshold due to an internal fault, the diaphragm 17 ruptures instantaneously, forming a pressure relief channel to release internal gas and reduce pressure, thereby preventing the gas box 3 from exploding due to high pressure. A sealing ring 20 is provided between the explosion-proof valve 12 and the gas box 3. The sealing ring 20 is used to improve the gas... The sealing between the box 3 and the explosion-proof valve 12 is ensured. A gas collecting hopper 9 is installed at the bottom of the explosion-proof valve 12. The gas collecting hopper 9 guides gas into the spiral tube 8. The bottom of the gas collecting hopper 9 is connected to the spiral tube 8, which buffers the released high-pressure gas, reducing the impact of the gas on the three-way valve 6 and the one-way valve 5, preventing damage. The cabinet 1 contains a gas cylinder 4 for gas storage. A one-way valve 5 is installed on the gas cylinder 4, ensuring that gas can only flow from the three-way valve 6 into the gas cylinder 4, preventing gas from flowing from the gas cylinder 4 back to the three-way valve 6, thus preventing gas leakage from the gas cylinder 4. The spiral tube 8... One end is equipped with a three-way valve 6. In operation, the three-way valve 6 connects the spiral tube 8 to the one-way valve 5, but disconnects the spiral tube 8 from the exhaust connector 16. When the diaphragm 17 ruptures, the gas flows sequentially through the spiral tube 8, the three-way valve 6, and the one-way valve 5 into the gas cylinder 4. When the gas tank 3 has released all its pressure, and it is necessary to extract the residual gas from the gas tank 3, connect the external extraction device to the exhaust connector 16, and then turn the handle on the three-way valve 6 to connect the spiral tube 8 to the exhaust connector 16, disconnecting the spiral tube 8 from the one-way valve 5. Start the external extraction device to extract the residual gas from the gas tank 3, so as to facilitate subsequent gas tank 3 operation. During disassembly and maintenance, one end of the three-way valve 6 is equipped with an exhaust connector 16, and the bottom of the explosion-proof valve 12 is provided with a connecting groove 15. The top of the gas collecting hopper 9 is integrally formed with a connecting part 13 that matches the connecting groove 15. The connecting part 13 is embedded in the connecting groove 15 to facilitate the fixing of the gas collecting hopper 9 and ensure that the gas collecting hopper 9 is firmly installed. A sealing gasket 18 is provided between the connecting part 13 and the explosion-proof valve 12. The sealing gasket 18 is used to increase the sealing between the connecting part 13 and the explosion-proof valve 12 to prevent gas leakage. The sealing gasket 18 and the sealing ring 20 are both made of rubber. Rubber has excellent elasticity and can play a good sealing role.

[0022] The output end of the one-way valve 5 is connected to the gas cylinder 4 via a pipe, and the input end of the one-way valve 5 is connected to the three-way valve 6 via a pipe.

[0023] The bottom of the gas box 3 is provided with multiple annularly distributed screws 10 along the edge of the vent 19. The annularly distributed screws 10 make the force more uniform, so that the explosion-proof valve 12 is installed firmly and prevents the explosion-proof valve 12 from separating from the gas box 3 when the diaphragm 17 ruptures, which would lead to gas leakage. The screws 10 are threaded with nuts 11 on the outside. The screws 10 and nuts 11 are used to fix the explosion-proof valve 12 and the connecting part 13. Under the action of the screws 10 and nuts 11, the explosion-proof valve 12 will press the sealing ring 20 and the connecting part 13 will press the sealing gasket 18, thereby improving the sealing performance of the sealing ring 20 and the sealing gasket 18.

[0024] Among them, the explosion-proof valve 12, the connecting part 13 and the sealing gasket 18 are all provided with through holes 14 corresponding to the screw 10, and the through holes 14 are used for the screw 10 to pass through.

[0025] Among them, the outer side of the gas cylinder 4 is provided with a clamp 7, which is used to fix the gas cylinder 4 to the cabinet 1, and the two ends of the clamp 7 are connected to the cabinet 1.

[0026] Specifically, when the pressure inside the gas tank 3 rises above the set threshold due to an internal malfunction, the diaphragm 17 ruptures instantly, forming a pressure relief channel. The gas inside the gas tank 3 flows out from the vent 19, passes through the explosion-proof valve 12, and enters the spiral tube 8 under the guidance of the gas collecting hopper 9. After passing through the spiral tube 8, the pressure of the gas is reduced to a certain extent. Then, the gas passes through the three-way valve 6 and the one-way valve 5 and enters the gas cylinder 4 for storage to prevent gas leakage. After the gas tank 3 releases its pressure, some gas will remain inside the gas tank 3. After removing the side plate 2 and connecting the external air extraction equipment to the exhaust connector 16, turn the handle on the three-way valve 6 to connect the spiral tube 8 to the exhaust connector 16 and disconnect the spiral tube 8 from the one-way valve 5. Start the external air extraction equipment to extract and collect the gas inside the gas tank 3 to prevent residual gas in the gas tank 3.

[0027] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An SF6 gas-insulated ring main unit, comprising a cabinet (1), side plates (2) disposed on both sides of the cabinet (1), and a gas box (3) mounted on the cabinet (1), wherein the bottom of the gas box (3) is provided with a vent (19), an explosion-proof valve (12) is installed at the vent (19), a diaphragm (17) is provided in the middle of the explosion-proof valve (12), and a sealing ring (20) is provided between the explosion-proof valve (12) and the gas box (3), characterized in that: The bottom of the explosion-proof valve (12) is equipped with a gas collecting hopper (9), and the bottom of the gas collecting hopper (9) is connected to a spiral tube (8). The cabinet (1) is equipped with a gas cylinder (4), and a one-way valve (5) is installed on the gas cylinder (4). A three-way valve (6) is installed at one end of the spiral tube (8), and an exhaust connector (16) is provided at one end of the three-way valve (6). A connecting groove (15) is opened at the bottom of the explosion-proof valve (12). The top of the gas collecting hopper (9) is integrally formed with a connecting part (13) that cooperates with the connecting groove (15). A sealing gasket (18) is provided between the connecting part (13) and the explosion-proof valve (12).

2. The SF6 gas-insulated ring main unit according to claim 1, characterized in that: The output end of the one-way valve (5) is connected to the gas cylinder (4) through a pipe, and the input end of the one-way valve (5) is connected to the three-way valve (6) through a pipe.

3. The SF6 gas-insulated ring main unit according to claim 1, characterized in that: The bottom of the air box (3) is provided with a plurality of screws (10) arranged in a ring at equal intervals along the edge of the vent (19), and the outer side of the screws (10) is threaded with nuts (11).

4. The SF6 gas-insulated ring main unit according to claim 3, characterized in that: The explosion-proof valve (12), the connecting part (13) and the sealing gasket (18) are all provided with through holes (14) corresponding to the screw (10).

5. An SF6 gas-insulated ring main unit according to claim 1, characterized in that: The gas cylinder (4) is provided with a clamp (7) on the outside, and the two ends of the clamp (7) are connected to the cabinet (1).

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