A gas pressure regulating device for a gas insulated ring main unit

Abstract

The application discloses a kind of gas pressure regulating device of gas insulated ring main unit. Including gas pressure compensation mechanism, water cooling mechanism and the transmission assembly being arranged between pressure tank and shunt tank, pressure tank is communicated with ring main unit body and can compensate the expansion or shrinkage of ring main unit body internal gas by the volume change of the inner cavity of pressure tank when the internal pressure of ring main unit body changes, water cooling mechanism also has multiple cooling pipes being arranged in ring main unit body and being communicated with shunt tank and can change heat exchange efficiency by increasing or decreasing the opening number of cooling pipe when the internal gas temperature of ring main unit body changes. Advantage is: the expansion or shrinkage of ring main unit body internal gas can be compensated by the volume change of the inner cavity of pressure tank, and when the internal gas temperature of ring main unit body changes, the opening number of cooling pipe is increased or decreased to change heat exchange efficiency, which guarantees the temperature stability of ring main unit body, effectively stabilizes the internal gas pressure of ring main unit body.

Description

Technical Field

[0001] This invention relates to a gas-insulated ring main unit, and more particularly to a gas pressure regulating device for a gas-insulated ring main unit. Background Technology

[0002] Gas-insulated ring main units are compact medium-voltage switchgear that completely seals all live components, including high-voltage switches, busbars, load switches, and fuses, within a stainless steel gas chamber filled with insulating gas. Their core feature is the utilization of the high insulation and strong arc-extinguishing properties of insulating gases such as SF6, achieving a fully insulated and sealed structure. This protects them from harsh environments such as condensation, dirt, and small animals, resulting in advantages such as small size, high reliability, long lifespan, and good safety. They are widely used in urban power grids, industrial parks, data centers, and other applications with high requirements for power supply reliability and space.

[0003] The insulation strength and arc-extinguishing capability of the gas inside the ring main unit depend primarily on its density rather than simply its pressure. When the temperature rises, the gas inside the tank may expand, causing its density to decrease; conversely, when the temperature decreases, the gas contracts, increasing its density. Pressure regulation can counteract these changes, ensuring that the gas density remains within the design requirements, thereby guaranteeing reliable insulation and arc-extinguishing performance. However, gas-insulated ring main units are enclosed and cannot utilize traditional heat exchange methods such as fans. This results in the internal temperature of the gas-insulated ring main unit being easily affected by the external environment, leading to poor internal gas pressure stability. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a gas pressure regulating device for a gas-insulated ring main unit that can ensure the internal temperature stability of the ring main unit and effectively stabilize the internal gas pressure of the ring main unit.

[0005] To solve the above-mentioned technical problems, the gas pressure regulating device for the gas-insulated ring main unit of the present invention includes a pressure compensation mechanism with a pressure tank for regulating the internal gas pressure of the ring main unit body, a water cooling mechanism with a diversion tank for reducing the internal temperature of the ring main unit body, and a transmission assembly disposed between the pressure tank and the diversion tank. The pressure tank of the pressure compensation mechanism is connected to the ring main unit body and can compensate for the expansion or contraction of the gas inside the ring main unit body by changing the internal volume of the pressure tank when the internal pressure of the ring main unit body changes. The water cooling mechanism also has multiple cooling pipes arranged in the ring main unit body and connected to the diversion tank, and can change the heat exchange efficiency by increasing or decreasing the number of open cooling pipes when the internal gas temperature of the ring main unit body changes.

[0006] The pressure compensation mechanism also includes a first piston disposed inside the pressure tank, and the water cooling mechanism also includes a water tank connected to the cooling pipe, a water pump for water circulation, and a second piston disposed inside the distribution tank. The transmission component cooperates with the first piston and the second piston respectively and can control the movement of the second piston inside the distribution tank when the first piston moves.

[0007] The pressure tank is located above the main body of the ring main unit, the water tank is located at the lower part of the main body of the ring main unit, the sides of each cooling pipe are in contact with the inner wall of the main body of the ring main unit, the water pump is located at the top of the main body of the ring main unit, the water pump and the distribution tank are connected through the first water pipe, and the water pump and the water tank are connected through the second water pipe.

[0008] The transmission assembly includes a guide rod, a second push plate that slides guided by the guide rod, and a telescopic assembly disposed between the pressure tank and the second push plate and cooperating with the first piston; one end of the guide rod is connected to the pressure tank, and the other end of the guide rod passes through the second push plate and is connected to the diversion tank.

[0009] A first piston rod is provided on one side of the first piston, one end of the first piston rod is connected to the first piston, and the other end of the first piston rod extends to the outside of the pressure tank and is connected to the telescopic assembly; a second piston rod is provided on one side of the second piston, one end of the second piston rod is connected to the second piston, and the other end of the second piston rod extends to the outside of the diversion tank and is connected to the second push plate.

[0010] The telescopic assembly includes a first push plate connected to the end of the first piston rod, a first transmission plate with a cross-shaped structure hinged to the first push plate, and a second transmission plate hinged to both ends of the first transmission plate; the first push plate is rotatably connected to the middle of the first transmission plate, the second transmission plate at one end of the first transmission plate is rotatably connected to the pressure tank, and the second transmission plate at the other end of the first transmission plate is rotatably connected to the second push plate.

[0011] A channel connecting the pressure tank and the ring main unit is provided; a retaining ring is provided on the inner wall of the pressure tank near the channel.

[0012] The distribution tank is equipped with distribution pipes that are matched with each of the cooling pipes.

[0013] The bottom of the ring main unit is provided with a bracket, and the side of the ring main unit is provided with a door.

[0014] The first water pipe is connected to the diversion tank and is located on one side of the second piston rod.

[0015] The advantages of this invention are: (1) By setting up a pressure compensation mechanism, a water cooling mechanism, and a transmission component between the pressure tank and the distribution tank, the pressure compensation mechanism can compensate for the expansion or contraction of the gas inside the ring main unit by changing the volume of the inner cavity of the pressure tank when the internal pressure of the ring main unit changes. At the same time, the water cooling mechanism can change the heat exchange efficiency by increasing or decreasing the number of open cooling pipes when the internal gas temperature of the ring main unit changes. The water cooling mechanism and the pressure compensation mechanism work together to ensure the internal temperature stability of the ring main unit and effectively stabilize the internal air pressure of the ring main unit.

[0016] (2) The transmission assembly cooperates with the first piston of the air pressure compensation mechanism and the second piston of the water cooling mechanism respectively. When the internal temperature of the ring main unit increases, the gas inside expands and pushes the first piston to move towards the distribution tank. When the internal temperature of the ring main unit decreases, the gas inside contracts and attracts the first piston to move in the opposite direction of the distribution tank. Thus, by moving the first piston inside the pressure tank, the internal air pressure of the ring main unit is further reliably stabilized.

[0017] (3) By setting up a water-cooling mechanism with multiple cooling pipes arranged in the ring main body and connected to the distribution tank, when the first piston drives the second piston to move in the positive direction, the internal temperature of the ring main body is in a decreasing state, and multiple distribution pipes are closed in sequence, thereby reducing the number of open cooling pipes and reducing the heat exchange efficiency of the ring main body. When the first piston drives the second piston to move in the opposite direction, the internal temperature of the ring main body is in a rising state, and multiple distribution pipes are opened in sequence, thereby increasing the number of open cooling pipes and improving the heat exchange efficiency of the ring main body, thus ensuring the stability of the internal temperature of the ring main body.

[0018] (4) By setting a transmission component with a specific structure, the first piston and the second piston are synchronized well. The transmission component uses the lever principle so that when the first piston drives the second piston to move, the ratio of the displacement of the first piston to the displacement of the second piston is 1:2, thereby amplifying the driving effect of the first piston and ensuring that the second piston can effectively control the opening and closing of the shunt tube, further ensuring reliability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the gas pressure regulating device of the gas-insulated ring main unit of the present invention; Figure 2 This is a schematic diagram of the pressure tank in the gas pressure regulating device of the gas-insulated ring main unit of the present invention. Figure 3 This is a schematic diagram of the distribution tank in the gas pressure regulating device of the gas-insulated ring main unit of the present invention.

[0020] In the diagram: 1. Ring main unit body; 101. Door; 102. Bracket; 2. Water tank; 201. Cooling pipe; 3. Water pump; 301. First water pipe; 302. Second water pipe; 4. Pressure tank; 401. First piston; 402. Retaining ring; 403. Air pipe; 404. First piston rod; 405. First push plate; 5. Diverter tank; 501. Second piston; 502. Second piston rod; 503. Second push plate; 504. Diverter pipe; 6. Transmission assembly; 601. Guide rod; 602. First transmission plate; 603. Second transmission plate. Detailed Implementation

[0021] The gas pressure regulating device of the gas-insulated ring main unit of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Please see Figures 1-3The gas pressure regulating device for the gas-insulated ring main unit of the present invention includes a gas pressure compensation mechanism for regulating the internal gas pressure of the ring main unit body 1, a water cooling mechanism for reducing the internal temperature of the ring main unit body 1 and having a diversion tank 5, and a transmission assembly 6 disposed between a pressure tank 4 and a diversion tank 5. The gas pressure compensation mechanism includes a pressure tank 4, and a first piston 401 is disposed inside the pressure tank 4. The water cooling mechanism includes a diversion tank and a second piston 501 disposed inside the diversion tank. The transmission assembly 6 cooperates with the first piston 401 and the second piston 501 respectively and can control the movement of the second piston 501 inside the diversion tank 5 when the first piston 401 moves. The transmission component 6 is cleverly used to amplify the displacement of the first piston and push the second piston 501 to move inside the distribution tank, ensuring high reliability. The water cooling mechanism also includes a water tank 2, cooling pipes 201, and a water pump 3. The water tank 2 is located at the lower part of the ring main unit. The cooling pipes 201 are installed on the inner wall of the ring main unit 1. As shown in the figure, the sides of each cooling pipe 201 are in contact with the inner wall of the ring main unit 1, and the lower end of the cooling pipe 201 is connected to the water tank 2. The distribution tank 5 is equipped with distribution pipes 504 that match each cooling pipe 201. One end of the distribution pipe 504 extends into the interior of the cooling pipe 201 and connects to the cooling pipe. The pressure tank 4 of the air pressure compensation mechanism and the water cooling mechanism are also included. The diversion tank 5 and water pump 3 are both located on the top of the ring main unit. The water pump 3 and the diversion tank 5 are connected by a first water pipe 301, and the water pump 3 and the water tank 2 are connected by a second water pipe 302. The first water pipe 301 is located on one side of the second piston rod 502. The water in the water tank 2 passes through the second water pipe 302, the water pump 3, the first water pipe 301, the diversion tank 5, the diversion pipe 504, and the cooling pipe 201 in sequence, and then returns to the interior of the water tank 2. A bracket 102 is provided at the bottom of the ring main unit 1, and a door 101 is provided on the side of the ring main unit 1. In addition, the pressure tank 4 of the air pressure compensation mechanism is connected to the ring main unit 1 and can be accessed inside the ring main unit. When the pressure changes, the expansion or contraction of the gas inside the ring main unit is compensated by the change in the internal volume of the pressure tank 4. Specifically, after the door 101 is closed, the ring main unit 1 is in a sealed state. When the internal temperature of the ring main unit 1 rises, the gas inside expands and pushes the first piston 401 to move towards the diversion tank 5. When the internal temperature of the ring main unit 1 drops, the gas inside contracts and attracts the first piston 401 to move in the opposite direction towards the diversion tank 5. Thus, by moving the first piston 401 inside the pressure tank 4, the gas pressure inside the ring main unit 1 is automatically stabilized, ensuring that the gas density inside the ring main unit 1 always has an effective insulation and arc extinguishing state.Meanwhile, since water pump 3 and distribution tank 5 are connected via the first water pipe 301, and water pump 3 and water tank 2 are connected via the second water pipe 302, the water in water tank 2 passes sequentially through the second water pipe 302, water pump 3, first water pipe 301, distribution tank 5, distribution pipe 504, and cooling pipe 201 before returning to the interior of water tank 2. The water inside water tank 2 cools down through natural and air cooling. The shape and route of cooling pipe 201 can be adjusted arbitrarily according to actual conditions. Thus, through the design of the water cooling mechanism, the heat exchange efficiency can be changed by increasing or decreasing the number of open cooling pipes when the internal gas temperature of the ring main unit changes.

[0023] Furthermore, the transmission assembly 6 includes a guide rod 601, a second push plate 503 that slides guided by the guide rod 601, and a telescopic assembly disposed between the pressure tank 4 and the second push plate 503 and cooperating with the first piston 401; the left end of the guide rod 601 is connected to the pressure tank 4, and the right end of the guide rod 601 passes through the second push plate 503 and is connected to the diversion tank 5, wherein the right side of the first piston 401 ( Figure 2 A first piston rod 404 is provided (shown in the left-right direction). The left end of the first piston rod 404 is connected to the first piston 401, and the right end of the first piston rod 404 extends to the outside of the pressure tank 4 and is connected to the telescopic assembly. A second piston rod 502 is provided on one side of the second piston 501. The right end of the second piston rod 502 is connected to the second piston 501, and the left end of the second piston rod 502 extends to the outside of the diversion tank 5 and is connected to the second push plate 503. The telescopic assembly includes a first push plate 405 connected to the end of the first piston rod 404, a first transmission plate 602 with a cross-shaped structure hinged to the first push plate 405, and a joint hinged to the left and right sides of the first transmission plate 602. Figure 2The second transmission plate 603 at both ends (shown in the left-right direction); the first push plate 405 is rotatably connected to the middle of the first transmission plate 602, the second transmission plate 603 at the left end of the first transmission plate 602 is rotatably connected to the pressure tank 4, and the second transmission plate 603 at the right end of the first transmission plate 602 is rotatably connected to the second push plate 503; wherein, the first piston 401 and the second piston 501 are both made of rubber, the first piston 401 and the second piston 501 are respectively attached to the inner walls of the pressure tank 4 and the diversion tank 5, the second piston 501 controls the opening and closing state of the diversion pipe 504 by blocking one end of the diversion pipe 504, thereby controlling the opening state of the cooling pipe 201 corresponding to the diversion pipe 504; thus, when the first piston 401 moves inside the pressure tank 4, the first piston 401 drives the second piston 501 to move inside the diversion tank 5 through the transmission assembly 6, when the first piston 401 drives the second piston 501 to move, the first piston 401 drives the second piston 501 to move inside the diversion tank 5. When the ring main unit 1 approaches the first water pipe 301, the internal temperature of the ring main unit 1 is decreasing, and multiple branch pipes 504 close sequentially, thereby reducing the number of open cooling pipes 201 and lowering the heat exchange efficiency of the ring main unit 1. When the first piston 401 drives the second piston 501 away from the first water pipe 301, the internal temperature of the ring main unit 1 rises, and multiple branch pipes 504 open sequentially, thereby increasing the number of open cooling pipes 201 and improving the heat exchange efficiency of the ring main unit 1, thus ensuring the stability of the internal temperature of the ring main unit 1. It should be noted that during this process, the transmission component 6 uses the lever principle so that when the first piston 401 drives the second piston 501 to move, the ratio of the displacement of the first piston 401 to the displacement of the second piston 501 is 1:2, thereby amplifying the driving effect of the first piston 401 and ensuring that the second piston 501 can effectively control the opening and closing of the branch pipes 504.

[0024] Furthermore, a channel 403 is provided between the pressure tank 4 and the ring main unit 1 to connect the two. The channel 403 can be an air pipe installed below the pressure tank, with one end of the air pipe connected to the pressure tank and the other end of the air pipe connected to the ring main unit. A retaining ring 402 is provided on the inner wall of the pressure tank 4 near the channel.

[0025] The working principle of this invention is as follows: by moving the first piston 401 inside the pressure tank 4, the expansion or contraction of the gas inside the ring main unit 1 is compensated, and the gas pressure inside the ring main unit 1 is automatically stabilized, ensuring that the gas density inside the ring main unit 1 always has an effective insulating and arc-extinguishing state. At the same time, the first piston 401 drives the second piston 501 to move inside the diversion tank 5 through the transmission component 6, so that when the gas inside the ring main unit 1 heats up, the number of open cooling pipes 201 is increased, improving the heat exchange efficiency of the ring main unit 1; when the gas inside the ring main unit 1 cools down, the number of open cooling pipes 201 is reduced, decreasing the heat exchange efficiency of the ring main unit 1, thereby ensuring the stability of the internal temperature of the ring main unit 1.

[0026] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A gas pressure regulating device for a gas-insulated ring main unit, characterized in that: The device includes a pressure compensation mechanism with a pressure tank (4) for adjusting the internal air pressure of the ring main unit (1), a water cooling mechanism with a diversion tank (5) for reducing the internal temperature of the ring main unit (1), and a transmission assembly (6) disposed between the pressure tank (4) and the diversion tank (5). The pressure tank (4) of the pressure compensation mechanism is connected to the ring main unit (1) and can compensate for the expansion or contraction of the gas inside the ring main unit by the change of the internal volume of the pressure tank (4) when the internal pressure of the ring main unit changes. The water cooling mechanism also has multiple cooling pipes (201) arranged inside the ring main unit (1) and connected to the diversion tank (5) and can change the heat exchange efficiency by increasing or decreasing the number of open cooling pipes when the internal gas temperature of the ring main unit changes.

2. The gas pressure regulating device for the gas-insulated ring main unit according to claim 1, characterized in that: The pressure compensation mechanism also includes a first piston (401) disposed in the pressure tank (4), and the water cooling mechanism also includes a water tank (2) connected to the cooling pipe, a water pump (3) for water circulation, and a second piston (501) disposed inside the diversion tank (5). The transmission assembly (6) cooperates with the first piston (401) and the second piston (501) respectively and can control the second piston (501) to move inside the diversion tank (5) when the first piston (401) moves.

3. The gas pressure regulating device for the gas-insulated ring main unit according to claim 2, characterized in that: The pressure tank (4) is located above the ring main unit (1), the water tank (2) is located at the bottom of the ring main unit (1), the sides of each cooling pipe (201) are attached to the inner wall of the ring main unit (1), the water pump (3) is located at the top of the ring main unit (1), the water pump (3) and the diversion tank (5) are connected by the first water pipe (301), and the water pump (3) and the water tank (2) are connected by the second water pipe (302).

4. The gas pressure regulating device for the gas-insulated ring main unit according to claim 2 or 3, characterized in that: The transmission assembly (6) includes a guide rod (601), a second push plate (503) that slides through the guide rod (601), and a telescopic assembly disposed between the pressure tank (4) and the second push plate (503) and cooperating with the first piston (401); one end of the guide rod (601) is connected to the pressure tank (4), and the other end of the guide rod (601) passes through the second push plate (503) and is connected to the diversion tank (5).

5. The gas pressure regulating device for the gas-insulated ring main unit according to claim 4, characterized in that: A first piston rod (404) is provided on one side of the first piston (401). One end of the first piston rod (404) is connected to the first piston (401), and the other end of the first piston rod (404) extends to the outside of the pressure tank (4) and is connected to the telescopic assembly. A second piston rod (502) is provided on one side of the second piston (501). One end of the second piston rod (502) is connected to the second piston (501), and the other end of the second piston rod (502) extends to the outside of the diversion tank (5) and is connected to the second push plate (503).

6. The gas pressure regulating device for the gas-insulated ring main unit according to claim 5, characterized in that: The telescopic assembly includes a first push plate (405) connected to the end of the first piston rod (404), a first transmission plate (602) with a cross-shaped structure hinged to the first push plate (405), and a second transmission plate (603) hinged to both ends of the first transmission plate (602); the first push plate (405) is rotatably connected to the middle of the first transmission plate (602), the second transmission plate (603) at one end of the first transmission plate (602) is rotatably connected to the pressure tank (4), and the second transmission plate (603) at the other end of the first transmission plate (602) is rotatably connected to the second push plate (503).

7. The gas pressure regulating device for a gas-insulated ring main unit according to claim 1, 2, 3, 5 or 6, characterized in that: A channel (403) is provided between the pressure tank (4) and the ring main unit (1) to connect the two; a retaining ring (402) is provided on the inner wall of the pressure tank (4) near the channel.

8. The gas pressure regulating device for the gas-insulated ring main unit according to claim 7, characterized in that: The distribution tank (5) is provided with distribution pipes (504) that are matched with each of the cooling pipes (201).

9. The gas pressure regulating device for the gas-insulated ring main unit according to claim 8, characterized in that: The bottom of the ring main unit (1) is provided with a bracket (102), and the side of the ring main unit (1) is provided with a door (101).

10. The gas pressure regulating device for the gas-insulated ring main unit according to claim 5, characterized in that: The first water pipe (301) is connected to the diversion tank (5) and is located on one side of the second piston rod (502).

Images