An SF6 make-up gas control box and an SF6 make-up gas system

Abstract

This utility model discloses an SF6 gas replenishment control box and an SF6 gas replenishment system. The SF6 gas replenishment control box includes a box body, which includes a main body and a cover. The cover is connected to the main body in an openable and closable manner. The main body contains a solenoid valve, a controller, and a power supply. The controller is electrically connected to the solenoid valve and the power supply, and also has a signal interface for communication with an SF6 gas sensor. The solenoid valve has an outlet end and an inlet end. The inlet end is connected to an inlet pipe, and the outlet end is connected to an outlet pipe. The inlet pipe and the outlet pipe extend out of the box body from both sides of the main body, facilitating connection with existing SF6 gas insulation equipment to achieve automatic leak detection and gas replenishment, thereby solving various shortcomings of manual inspection in related technologies.

Description

Technical Field

[0001] This utility model relates to the technical field of SF6 gas insulation equipment, and in particular to an SF6 gas replenishment control box and an SF6 gas replenishment system. Background Technology

[0002] Currently, SF6 gas is widely used as an arc-quenching gas in various high-voltage electrical equipment and as an insulating gas.

[0003] However, SF6 gas leaks can lead to numerous safety hazards. For example, leaks can cause insufficient gas pressure, potentially triggering electrical discharges, short circuits, or even equipment explosions, threatening the stability of the power system. High SF6 concentrations in low-lying areas can create oxygen-deficient environments, requiring strict monitoring and ventilation before entry. SF6 decomposes under electric arcs or high temperatures, producing toxic substances such as sulfur fluoride (SF4) and hydrogen fluoride (HF), which are highly corrosive and can burn the skin and eyes, and damage the respiratory system.

[0004] In order to detect SF6 gas leaks in a timely manner, the existing technology usually adopts manual inspection technology. After the gas leak is discovered, gas is manually replenished using a gas replenishment tank. However, this gas replenishment method is inefficient and prone to misjudgment.

[0005] Therefore, this utility model is proposed. Utility Model Content

[0006] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide an SF6 gas replenishment control box and an SF6 gas replenishment system, which are convenient to connect with existing SF6 gas insulation equipment to realize automatic detection and gas replenishment of leaks, thereby solving the various shortcomings of manual inspection in related technologies.

[0007] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0008] According to one aspect of this utility model, an SF6 gas replenishment control box is provided, characterized in that it includes a box body, the box body comprising a main body and a box cover, the box cover being connected to the main body in an openable and closable manner; the main body is provided with a solenoid valve, a controller, and a power supply, the controller being electrically connected to the solenoid valve and the power supply respectively, and the controller also having a signal interface for communication with an SF6 gas sensor; the solenoid valve has an outlet end and an inlet end, the inlet end being connected to an inlet pipe, the outlet end being connected to an outlet pipe, the inlet pipe and the outlet pipe respectively extending out of the box body from both sides of the main body.

[0009] Optionally, a warning light may also be included, and the controller is also electrically connected to the warning light.

[0010] Optionally, the air inlet pipe and the air outlet pipe are respectively connected to the air inlet end and air outlet end of the solenoid valve via detachable connectors.

[0011] Optionally, the air inlet pipe and the air outlet pipe are further provided with pipe clamps near the joint to secure the pipes.

[0012] Optionally, the bottom of the solenoid valve, controller, and power supply is also provided with a support frame, which has a grid structure.

[0013] According to another aspect of this utility model, an SF6 gas replenishment system is also provided, comprising an SF6 gas insulation device, an SF6 gas sensor for monitoring the gas pressure of the SF6 gas insulation device, a gas replenishment tank, and the aforementioned SF6 gas replenishment control box. The outlet pipe of the SF6 gas replenishment control box is connected to the inlet end of the SF6 gas insulation device, and the inlet pipe of the SF6 gas replenishment control box is connected to the outlet end of the gas replenishment tank. The controller of the SF6 gas replenishment control box is signal-connected to the SF6 sensor.

[0014] This utility model provides an SF6 gas replenishment control box and an SF6 gas replenishment system, including an independent control box integrating a solenoid valve and a controller. An inlet pipe and a replenishment pipe are led out from both sides of the box. The inlet pipe connects to the replenishment tank, and the outlet pipe connects to the SF6 gas insulation equipment. The controller can communicate with the sensors of the SF6 gas insulation equipment to easily determine if there is a leak based on the signal. In case of a leak, the solenoid valve is automatically opened, allowing gas from the replenishment tank to enter the SF6 gas insulation equipment for replenishment. This control box can be directly connected to the SF6 gas insulation equipment and the replenishment tank at the equipment site, making operation very convenient. Automatic replenishment can be achieved without significant modifications to the entire system. Furthermore, if a fault occurs, a new control box can be directly replaced, and the existing control box can be returned to the factory for repair. There is no need for a long-term shutdown of the entire system for adjustment, ensuring the continuous operation of the SF6 gas insulation equipment and the replenishment system. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of an SF6 gas replenishment control box provided in an embodiment of this utility model;

[0016] Figure 2 A schematic diagram of an SF6 gas replenishment control system provided in an embodiment of this utility model;

[0017] In the picture:

[0018] 1-Enclosure; 2-Solenoid valve; 3-Controller; 4-Power supply; 5-Inlet pipe; 6-Outlet pipe; 7-Connector; 8-Clamp; 9-Support frame; 10-Communication antenna; 11-Main body; 12-Enclosure cover. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] This utility model provides an SF6 gas replenishment control box, combined with... Figure 1 The system includes a housing 1, which comprises a main body 11 and a cover 12. The cover 12 is connected to the main body 11 in an openable and closable manner, such as a snap-fit ​​connection, to facilitate maintenance by opening the housing 1 for individual replacement of components such as the controller and solenoid valve. The main body 11 houses a solenoid valve 2, a controller 3, and a power supply 4. The controller 3 is electrically connected to both the solenoid valve 2 and the power supply 4, supplying power through the power supply 4 and driving the solenoid valve 2. The controller 3 also has a signal interface for communication with an SF6 gas sensor. The solenoid valve 2 has an outlet and an inlet. The inlet is connected to an inlet pipe 5, and the outlet is connected to an outlet pipe 6. The inlet and outlet pipes 5 and 6 extend out of the housing 1 from both sides of the main body 11. Because the pipes extend out of the housing 1, the control box can also integrate the connecting pipes, facilitating direct connection to SF6 gas insulation equipment and replenishment tanks on-site, thus improving installation efficiency. Power supply 4 can be a lithium battery, which can be connected to controller 3 alone or to solenoid valve 2. That is, solenoid valve 2 can be directly powered by power supply 4 or indirectly powered by controller 3.

[0021] The controller 3 may include various communication modules, such as Bluetooth, 5G, LoRa, etc., to communicate with sensors. The communication antenna 10 of the controller 3 can be extended to the outside of the control box.

[0022] Furthermore, the control box also includes a warning light (not shown in the figure) located on the outside of the box. The controller 3 is also electrically connected to the warning light so as to send a warning signal when a gas leak is detected, so as to promptly alert the staff.

[0023] The intake pipe 5 and the outlet pipe 6 are connected to the intake and outlet ends of the solenoid valve 2 respectively via detachable connectors 7. In this way, if the intake pipe 5 and the outlet pipe 6 malfunction, they can be replaced individually without replacing the entire control box.

[0024] The intake pipe 5 and the exhaust pipe 6 are also equipped with pipe clamps 8 near the joint 7 to tighten the pipes. In this way, the interface of the intake pipe 5 and the exhaust pipe 6 near the solenoid valve 2 will be thickened due to the compression of the pipe clamps 8, which will improve the tightness with the inner wall of the interface of the solenoid valve 2, thereby improving the sealing performance of the joint and reducing the risk of SF6 leakage in the air supply passage.

[0025] The bottom of the solenoid valve 2, controller 3, and power supply 4 is also equipped with a support frame 9, which has a mesh structure. The support frame 9 can be made of flexible material, which serves both as shock absorption and heat dissipation for the solenoid valve 2, controller 3, and power supply 4. In particular, in this embodiment, in order to make the structure compact, the power supply 4 is directly connected to the bottom of the controller 3, which may generate a lot of heat. In this case, the support frame 9 can provide a good heat dissipation effect.

[0026] As a further improvement, wireless stress sensors (not shown in the figure, which can be arranged in an array along the length of the inner wall of the pipe) can be installed on the inner walls of the intake pipe 5 and the exhaust pipe 6, and communicate with the controller 3. The purpose of this is that when SF6 is replenished, pulsed airflow is often released, which will cause instantaneous impact on the inner wall of the pipe. Over time, this may damage the pipe. By detecting the stress on the inner wall of the pipe, the controller 3 can easily grasp the situation in time. The controller 3 can be connected to a second warning light (not shown in the figure) so that when the stress on the inner wall of the pipe reaches a dangerous value, an alarm can be set in time, the pipe can be replaced, and leakage can be prevented.

[0027] Combination Figure 2 This utility model embodiment also provides an SF6 gas replenishment system, including an SF6 gas insulation device, an SF6 sensor for monitoring the gas pressure of the SF6 gas insulation device, a replenishment tank, and the aforementioned SF6 replenishment control box. The outlet pipe 6 of the SF6 replenishment control box is connected to the inlet end of the SF6 gas insulation device, and the inlet pipe 5 of the SF6 replenishment control box is connected to the outlet end of the replenishment tank. The controller 3 of the SF6 replenishment control box is signal-connected to the SF6 sensor. In addition to detecting gas pressure, the SF6 sensor may also have a temperature sensor and a gas density sensor to more comprehensively monitor the SF6 gas conditions. When the controller 3 detects that the pressure is lower than a threshold, it automatically controls the solenoid valve 2 to open. Since the gas pressure in the replenishment tank is set to be higher than the gas pressure of the SF6 gas insulation device, replenishment of gas to it can be achieved.

[0028] In some embodiments, the solenoid valve 2 is located near the outlet pipe 6, while the controller 3 and the power supply 4 are located near the inlet pipe 5. The SF6 sensor is located on the pipe between the SF6 gas insulation device and the outlet pipe 6. The advantage of this arrangement is that if the power supply 4 fails and generates a large amount of heat, the pipe corresponding to the SF6 sensor is not easily affected by the heat generated by the power supply 4, which would affect the gas pressure change. This avoids large inaccuracies in the gas pressure detection value, thereby affecting the accuracy of gas leak detection and gas replenishment.

[0029] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An SF6 gas make-up control tank characterized by, The enclosure includes a housing (1), which includes a main body (11) and a cover (12). The cover (12) is connected to the main body (11) in an openable and closable manner. The main body (11) is equipped with a solenoid valve (2), a controller (3) and a power supply (4). The controller (3) is electrically connected to the solenoid valve (2) and the power supply (4) respectively, and the controller (3) also has a signal interface for communicating with an SF6 gas sensor. The solenoid valve (2) has an outlet end and an inlet end. The inlet end is connected to an inlet pipe (5), and the outlet end is connected to an outlet pipe (6). The inlet pipe (5) and the outlet pipe (6) respectively pass through the housing (1) from both sides of the main body (11).

2. The SF6 gas refill control box according to claim 1, characterized in that, It also includes a warning light, and the controller (3) is also electrically connected to the warning light.

3. The SF6 gas refill control box according to claim 1, characterized in that, The air inlet pipe (5) and the air outlet pipe (6) are respectively connected to the air inlet end and air outlet end of the solenoid valve (2) through detachable connectors (7).

4. The SF6 gas refill control box according to claim 3, characterized in that, The air intake pipe (5) and the air outlet pipe (6) are also provided with pipe clamps (8) near the joint (7) to secure the pipes.

5. The SF6 makeup control tank of claim 1, wherein, The bottom of the solenoid valve (2), controller (3) and power supply (4) is also provided with a support frame (9), which has a grid structure.

6. An SF6 gas replenishment system, comprising an SF6 gas insulation device, an SF6 gas sensor for monitoring the gas pressure of the SF6 gas insulation device, a gas replenishment tank, and an SF6 gas replenishment control box according to any one of claims 1-5, wherein the outlet pipe (6) of the SF6 gas replenishment control box is connected to the inlet end of the SF6 gas insulation device, the inlet pipe (5) of the SF6 gas replenishment control box is connected to the outlet end of the gas replenishment tank, and the controller (3) of the SF6 gas replenishment control box is signal-connected to the SF6 gas sensor.

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