Gas mixing and charging device for electrical equipment

Abstract

The utility model discloses a gas mixing and inflating device for electrical equipment, which comprises a main pipeline, and the main pipeline is sequentially provided with a constant-temperature heat exchanger, a premixing buffer tank, a purification dryer, a first electromagnetic valve, a compressor, a gas storage tank, a third pressure reducing valve, a second electromagnetic valve, a first one-way valve, a gas chamber pressure sensor and a switch interface along the gas inlet direction. The upstream end of the main pipeline is connected into two air inlet pipelines in parallel, each air inlet pipeline is sequentially provided with an air inlet bottle, a pressure reducing valve, a pressure gauge and a mass flow controller, and the downstream end of the main pipeline is connected into a detection branch pipe and a vacuumizing branch pipe in parallel. Accurate proportioning control of the SF6 mixed gas is realized, and the concentration of the mixed gas is not influenced by environmental factors; the constant-temperature heater enables the temperatures of the two component gases in the mixed gas to be consistent, so that the gas filling requirement is met; the premixing buffer tank is used for further blending the input mixed gas, so that the good mixing uniformity of the two gases in the gas storage tank is ensured; the self-adaptive accurate control function is realized, and the gas supplementing efficiency of the SF6 electrical equipment is greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of gas mixing and inflation devices for electrical equipment, and specifically to a gas mixing and inflation device for electrical equipment. Background Technology

[0002] SF6 electrical equipment, due to its superior insulation strength, high withstand voltage, small footprint, and long maintenance cycle, offers numerous advantages in power grid installation and maintenance, leading to its increasing use in power systems year by year. However, limitations such as insufficient manufacturing precision, poor sealing materials, and suboptimal on-site installation quality cause the internal gas pressure of SF6 electrical equipment to continuously decrease over time. When the internal gas pressure drops to the blocking value, the insulation and arc-extinguishing performance of the SF6 electrical equipment will severely deteriorate, thus affecting the stable operation of the power grid. Therefore, it is necessary to periodically replenish SF6 electrical equipment with SF6 gas or SF6 mixtures to ensure that the gas pressure inside the SF6 electrical equipment meets the requirements for safe operation.

[0003] Currently, both domestic and international research on the insulation performance of mixed gases and the application of mixed gases in the field to supplement SF6 electrical equipment still uses the method of first filling with SF6 and then filling with N2 or CF4. This filling method suffers from drawbacks such as low filling efficiency, difficulty in controlling the ratio of the two gases in the SF6 electrical equipment's gas chamber, and the easy introduction of moisture from the air during the filling process. Therefore, this invention proposes a mixed gas filling device for electrical equipment to solve the aforementioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to overcome the deficiencies in the existing technology and provide a gas mixing and filling device for electrical equipment. This device utilizes mass flow controllers on two inlet pipes to achieve precise ratio control of the SF6 mixed gas, ensuring that the concentration of the SF6 mixed gas is unaffected by changes in ambient temperature, humidity, or pressure. After the initial mixed SF6 and N2 or SF6 and CF4 gas is input into the two inlet pipes, it is heated at a constant temperature by a constant-temperature heater, ensuring that the two components in the mixed gas reach the same temperature and meet the filling standard requirements. A premixed buffer tank further blends the input SF6 and N2 or SF6 and CF4 mixed gas, resulting in good uniformity of the two gases stored in the gas tank. A gas component detector on the detection branch pipe can monitor the actual ratio of each component in the mixed gas in the gas tank in real time, allowing for adjustment of the SF6 and N2 or SF6 and CF4 intake ratio based on the actual ratio. This achieves adaptive and precise control, significantly improving the gas replenishment efficiency of SF6 electrical equipment.

[0005] To achieve the above objectives, the technical solution of this utility model is to design an electrical equipment gas mixing and charging device, including a main pipeline. Along the gas inlet direction, the main pipeline is sequentially equipped with a constant temperature heat exchanger, a premixed buffer tank, a purification dryer, a solenoid valve, a compressor, a gas storage tank, a pressure reducing valve, a solenoid valve, a check valve, a gas chamber pressure sensor, and a switch interface. Two gas inlet pipes are connected in parallel at the upstream end of the main pipeline. Each gas inlet pipe is sequentially equipped with a gas cylinder, a pressure reducing valve, a pressure gauge, and a mass flow controller. A detection branch pipe and a vacuum branch pipe are connected in parallel at the downstream end of the main pipeline. The upstream ends of both the detection branch pipe and the vacuum branch pipe are connected to the gas storage tank and... On the main pipeline between the pressure reducing valves, the downstream end of the detection branch pipe connects to the downstream end of the vacuum branch pipe. Along the air intake direction, the detection branch pipe is sequentially equipped with solenoid valve three, pressure reducing valve four, and a gas component detector. Along the air intake direction, the vacuum branch pipe is sequentially equipped with solenoid valve four, a vacuum pump, and an exhaust port. The premixed buffer tank is equipped with pressure gauge three, and the gas storage tank is equipped with pressure gauge four. The pressure reducing valve, pressure gauge, mass flow controller, pressure gauge three, solenoid valve one, compressor, pressure reducing valve three, solenoid valve two, check valve one, gas chamber pressure sensor, solenoid valve four, vacuum pump, solenoid valve three, pressure reducing valve four, and gas component detector located on the two air intake pipelines are all connected to the control system.

[0006] This utility model discloses a gas mixing and filling device for electrical equipment. In use, one upstream end of the inlet pipe is connected to an SF6 gas cylinder, and the upstream end of the other inlet pipe is connected to N2 or CF4 gas. When the gas chamber pressure sensor detects that the internal gas pressure of the SF6 electrical equipment is too low and requires gas replenishment, the vacuum pump on the vacuum branch pipe is first used to remove air and moisture from the pipes. Then, the mass flow controllers on the two inlet pipes respectively inject a certain amount of precisely proportioned SF6 and N2 mixture or SF6 and CF4 mixture into the premixed buffer tank. The SF6 mixture in the premixed buffer tank is then filtered and pre-dried by a purification dryer, pressurized by a compressor, and stored in a gas storage tank. The SF6 mixture in the storage tank is then depressurized by a pressure reducing valve and replenished into the gas chamber inside the SF6 electrical equipment. When the gas chamber pressure sensor detects that the internal gas pressure of the SF6 electrical equipment reaches the set requirement, the control system promptly shuts down the compressor and related valves. The system enables the replenishment of SF6 gas into SF6 electrical equipment. It utilizes mass flow controllers on two intake pipes to precisely control the SF6 mixture ratio, ensuring the SF6 concentration is unaffected by changes in ambient temperature, humidity, or pressure. After the initial SF6 and N2 or SF6 and CF4 mixture is introduced into the two intake pipes, it is heated at a constant temperature by a thermostatic heater, ensuring the two components reach the same temperature and meet the filling standard requirements. A premixed buffer tank further blends the introduced SF6 and N2 or SF6 and CF4 mixture, resulting in a highly uniform mixture in the gas storage tank. A gas component detector on the detection branch pipe monitors the actual proportions of each component in the gas mixture in the storage tank in real time, allowing for adjustments to the SF6 and N2 or SF6 and CF4 intake ratios. This adaptive and precise control significantly improves the replenishment efficiency of SF6 electrical equipment.

[0007] A preferred technical solution further includes a gas chamber sampling branch pipe. One end of the gas chamber sampling branch pipe is connected to the detection branch pipe between solenoid valve three and pressure reducing valve four, and the other end is connected to the main pipeline between check valve one and gas chamber pressure sensor. The gas chamber sampling branch pipe is equipped with solenoid valve six, which is connected to the control system. The gas chamber sampling pipe is connected in parallel to the detection branch pipe. Before replenishing the SF6 electrical equipment with gas, the gas in the internal gas chamber of the SF6 electrical equipment can be introduced into the detection branch pipe to achieve component analysis of the gas in the internal gas chamber of the SF6 electrical equipment. This provides a reliable basis for adjusting the ratio of the two sample gases on the two inlet pipelines of the gas mixing and filling device of this utility model.

[0008] A further preferred technical solution is that a dryer is also provided on the main pipeline between the gas storage tank and the pressure reducing valve. The dryer provides secondary drying for the SF6 mixed gas output from the gas storage tank, thereby further ensuring that the SF6 mixed gas supplied to the SF6 electrical equipment is well-dryed, which is beneficial to ensuring the stability and safety of the SF6 electrical equipment during operation.

[0009] A further preferred technical solution is that a second one-way valve is also provided on the main pipeline between the compressor and the gas storage tank. The second one-way valve ensures that the SF6 mixture inside the gas storage tank does not flow back, which helps to improve the pressure holding performance of the gas storage tank.

[0010] A further preferred technical solution includes a straight-through air inlet branch pipe. One end of the straight-through air inlet branch pipe connects to the main pipeline between the purifier / dryer and solenoid valve one, and the other end connects to the main pipeline between the compressor and check valve two. The straight-through air inlet branch pipe is equipped with solenoid valve five, which is connected to the control system and is normally open. When the gas pressure inside the premixed buffer tank is greater than the gas pressure inside the storage tank, the mixed gas inside the premixed buffer tank can enter the storage tank through the straight-through air inlet branch pipe, which helps to save energy consumption in the initial stage of operation of this gas mixing and charging device.

[0011] A further preferred technical solution is that the outlet of the constant temperature heat exchanger and the inlet of the premixed buffer tank are connected by a spiral mixing pipe. The pre-mixed SF6 and N2 or SF6 and CF4 gas discharged from the constant temperature heat exchanger is automatically mixed by the spiral mixing pipe and then enters the premixed buffer tank, which significantly improves the mixing uniformity of the two component gases, SF6 and N2 or SF6 and CF4.

[0012] A further preferred technical solution is that both the premixed buffer tank and the gas storage tank are vertically arranged, with their air inlets located at the waist level. Two air outlets, one at the top and one at the bottom, are connected in parallel to the main pipeline via a duct. Connecting a duct at the bottom and one at the top of the tank before converging on the main pipeline reduces the impact of uneven mixing of the gases within the tank, further ensuring the uniformity of the gas mixture entering the SF6 electrical equipment.

[0013] A further preferred technical solution is that one of the aforementioned air intake pipes is provided with an air intake cylinder, a pressure reducing valve, a pressure gauge, and a mass flow controller in sequence along the air intake direction, and the other of the aforementioned air intake pipes is provided with an air intake cylinder, a pressure reducing valve, a pressure gauge, and a mass flow controller in sequence along the air intake direction.

[0014] A further preferred technical solution is that two compressors are arranged in parallel. This achieves a one-for-one standby function, meaning that when one compressor fails, the other can still operate normally, ensuring the smooth operation of this gas mixing and charging device.

[0015] A further preferred technical solution is that both the outer periphery of the premixed buffer tank and the outer periphery of the gas storage tank are covered with a thermal insulation layer. This thermal insulation layer helps to isolate the interior of the tank from the outside environment, thereby helping to ensure that the temperature of the SF6 mixed gas inside the tank remains within the temperature range required for use.

[0016] The advantages and beneficial effects of this utility model are as follows:

[0017] 1. This utility model discloses a gas mixing and filling device for electrical equipment. In use, one upstream end of an inlet pipe is connected to an SF6 gas cylinder, and the upstream end of another inlet pipe is connected to N2 or CF4 gas. When the gas chamber pressure sensor detects that the internal gas pressure of the SF6 electrical equipment is too low and requires gas replenishment, the vacuum pump on the vacuum branch pipe is first used to remove air and moisture from the pipes. Then, a certain amount of precisely proportioned SF6 and N2 or SF6 and CF4 mixed gas is injected into the premixed buffer tank using mass flow controllers on the two inlet pipes. The SF6 mixed gas in the premixed buffer tank is then filtered and pre-dried by a purification dryer, pressurized by a compressor, and stored in a gas storage tank. The SF6 mixed gas in the storage tank is then depressurized by a pressure reducing valve and replenished into the gas chamber inside the SF6 electrical equipment. When the gas chamber pressure sensor detects that the internal gas pressure of the SF6 electrical equipment reaches the set requirement, the control system promptly shuts down the compressor and related valves. The process of replenishing SF6 gas into the electrical equipment is stopped. This involves using mass flow controllers on two intake pipes to achieve precise SF6 gas mixture ratio control, ensuring the SF6 gas mixture concentration is unaffected by changes in ambient temperature, humidity, or pressure. After the initial SF6 and N2 or SF6 and CF4 mixture is introduced into the two intake pipes, it is heated at a constant temperature by a thermostatic heater, ensuring the two components in the mixture reach the same temperature and meet the filling standard requirements. A premixed buffer tank further blends the introduced SF6 and N2 or SF6 and CF4 mixture, resulting in good uniformity of the two gases stored in the gas tank. A gas component detector on the detection branch pipe monitors the actual proportions of each component in the gas mixture in the gas tank in real time, allowing for adjustments to the SF6 and N2 or SF6 and CF4 intake ratios based on these proportions. This adaptive and precise control significantly improves the gas replenishment efficiency of the SF6 electrical equipment.

[0018] 2. The gas chamber sampling tube is connected in parallel to the detection branch tube. Before replenishing the gas for the SF6 electrical equipment, the gas in the gas chamber inside the SF6 electrical equipment can be introduced into the detection branch tube to realize the component analysis of the gas in the gas chamber inside the SF6 electrical equipment. This provides a reliable basis for adjusting the ratio of the two sample gases on the two gas inlet pipes of the gas mixing and filling device of this utility model.

[0019] 3. A dryer is also installed on the main pipeline between the gas storage tank and the pressure reducing valve. The dryer provides secondary drying for the SF6 mixed gas output from the gas storage tank, thereby further ensuring that the SF6 mixed gas supplied to the SF6 electrical equipment is well-dryed, which helps ensure the stability and safety of the SF6 electrical equipment during operation.

[0020] 4. When the gas pressure inside the premixed buffer tank is greater than the gas pressure inside the storage tank, the mixed gas inside the premixed buffer tank can enter the storage tank through the direct inlet branch pipe, which helps to save energy consumption in the initial stage of operation of the gas mixing and filling device of this utility model.

[0021] 5. The SF6 and N2 or SF6 and CF4 mixed gas discharged from the constant temperature heat exchanger after preliminary mixing is automatically mixed by the spiral mixing tube and then enters the premixed buffer tank, which significantly improves the mixing uniformity of the two component gases, SF6 and N2 or SF6 and CF4.

[0022] 6. Connecting a gas guide pipe to the bottom and top of the tank and then converging them into the main pipeline reduces the impact of uneven mixing of the gas inside the tank, further ensuring the uniformity of the gas mixture entering the SF6 electrical equipment.

[0023] 7. Both the outer periphery of the premixed buffer tank and the outer periphery of the gas storage tank are covered with a thermal insulation layer. The thermal insulation layer helps to isolate the heat conduction between the inside of the tank and the outside, thereby helping to ensure that the temperature of the SF6 mixed gas inside the tank remains within the temperature range that meets the usage requirements. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an electrical equipment gas mixing and charging device in Embodiment 1;

[0025] Figure 2 This is a schematic diagram of the structure of an electrical equipment gas mixing and inflation device in Embodiment 2.

[0026] In the diagram: Ⅰ. Inlet pipe; Ⅱ. Main pipe; Ⅲ. Straight-through inlet branch pipe; Ⅳ. Detection branch pipe; Ⅴ. Gas chamber sampling branch pipe; Ⅵ. Vacuum branch pipe; 1. Gas cylinder one; 2. Pressure reducing valve one; 3. Pressure gauge one; 4. Mass flow controller one; 5. Gas cylinder two; 6. Pressure reducing valve two; 7. Pressure gauge two; 8. Mass flow controller two; 9. Thermostatic heat exchanger; 10. Premixed buffer tank; 11. Pressure gauge three; 12. Purification dryer; 13. Solenoid valve one; 14. Compressor ; 15. Gas storage tank; 16. Pressure gauge four; 17. Dryer; 18. Pressure reducing valve three; 19. Solenoid valve two; 20. Check valve one; 21. Gas chamber pressure sensor; 22. Switch interface; 23. Solenoid valve three; 24. Pressure reducing valve four; 25. Gas component detector; 26. Solenoid valve four; 27. Vacuum pump; 28. Exhaust port; 29. ​​Solenoid valve five; 30. Solenoid valve six; 31. Check valve two; 32. Spiral mixing tube; A. Gas outlet; B. Gas guide tube. Detailed Implementation

[0027] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0028] Example 1

[0029] like Figure 1As shown, an electrical equipment gas mixing and charging device includes a main pipeline II. Along the gas inlet direction, the main pipeline II is sequentially equipped with a constant temperature heat exchanger 9, a premixed buffer tank 10, a purification dryer 12, a solenoid valve 13, a compressor 14, a gas storage tank 15, a pressure reducing valve 18, a solenoid valve 19, a one-way valve 20, a gas chamber pressure sensor 21, and a switch interface 22. Two gas inlet pipes I are connected in parallel at the upstream end of the main pipeline II. Each gas inlet pipe I is sequentially equipped with a gas cylinder, a pressure reducing valve, a pressure gauge, and a mass flow controller along the gas inlet direction. A detection branch pipe IV and a vacuum branch pipe VI are connected in parallel at the downstream end of the main pipeline II. The upstream ends of the detection branch pipe IV and the vacuum branch pipe VI both connect to the main pipeline II between the gas storage tank 15 and the pressure reducing valve 18. The downstream end of the measuring branch pipe IV connects to the downstream end of the vacuum branch pipe VI. Along the air intake direction, the measuring branch pipe IV is equipped with a solenoid valve 23, a pressure reducing valve 24, and a gas component detector 25. Along the air intake direction, the vacuum branch pipe VI is equipped with a solenoid valve 26, a vacuum pump 27, and an exhaust port 28. The premixed buffer tank 10 is equipped with a pressure gauge 11, and the gas storage tank 15 is equipped with a pressure gauge 16. The pressure reducing valve, pressure gauge, mass flow controller, pressure gauge 11, solenoid valve 13, compressor 14, pressure reducing valve 18, solenoid valve 19, check valve 20, gas chamber pressure sensor 21, solenoid valve 26, vacuum pump 27, solenoid valve 23, pressure reducing valve 24, and gas component detector 25 located on the two air intake pipes I are all connected to the control system. Specifically, the gas component detector 25 can be one of a gas sensor, a mass spectrometer, or a thermal conductivity detector.

[0030] Preferably, it also includes a gas chamber sampling branch pipe V, one end of which is connected to the detection branch pipe IV between the solenoid valve 23 and the pressure reducing valve 24, and the other end is connected to the main pipeline II between the check valve 20 and the gas chamber pressure sensor 21. The gas chamber sampling branch pipe V is equipped with a solenoid valve 30 connected to the control system.

[0031] More preferably, the main pipeline II is also provided with a dryer 17 located between the gas storage tank 15 and the pressure reducing valve 18.

[0032] More preferably, the main pipeline II is further provided with a one-way valve II 31 located between the compressor 14 and the air tank 15.

[0033] More preferably, it also includes a straight-through intake branch pipe III, one end of which is connected to the main pipeline II between the purifier dryer 12 and the solenoid valve 13, and the other end is connected to the main pipeline II between the compressor 14 and the one-way valve 31. The straight-through intake branch pipe III is equipped with a solenoid valve 29 connected to the control system, and the solenoid valve 29 is in the normally open state.

[0034] More preferably, one of the air intake pipes I is provided with an air intake cylinder 1, a pressure reducing valve 2, a pressure gauge 3 and a mass flow controller 4 in sequence along the air intake direction, and the other air intake pipe I is provided with an air intake cylinder 2 5, a pressure reducing valve 2 6, a pressure gauge 2 7 and a mass flow controller 2 8 in sequence along the air intake direction.

[0035] The working principle of an electrical equipment gas mixing and inflation device in Example 1:

[0036] In use, the switch interface 22 is connected to the gas replenishment connector on the SF6 electrical equipment. When the gas chamber pressure sensor 21 detects that the internal gas pressure of the SF6 electrical equipment is too low and gas needs to be replenished, the vacuum pump 27 on the vacuum branch pipe VI is used to remove the air and moisture from the pipeline. The control system controls the solenoid valve 30 to open, and the SF6 mixed gas in the gas chamber inside the SF6 electrical equipment enters the gas component detector 25 through the gas chamber sampling branch pipe V and the pressure reducing valve 24 to detect and analyze the content of each component, and feeds the results back to the control system. Based on the SF6 mixed gas component content results in the gas chamber inside the SF6 electrical equipment, the control system calculates the required ratio of SF6 and N2 mixed gas or SF6 and CF4 gas components to be replenished. Gas cylinder 1 contains high-pressure SF6 gas. The premixed buffer tank 10 is filled with either N2 or CF4 high-pressure gas. The control system sends signals to the mass flow controllers 4 and 8 to determine the proportion of the two gases, thereby injecting a precise amount of SF6 and N2 or SF6 and CF4 mixture into the premixed buffer tank 10. The SF6 mixture in the premixed buffer tank 10 is filtered and pre-dried by the purification dryer 12, pressurized by the compressor 14, and then stored in the gas storage tank 15. The SF6 mixture in the gas storage tank 15 is depressurized by the pressure reducing valve 18 and then injected into the gas chamber inside the SF6 electrical equipment. When the gas chamber pressure sensor 21 detects that the gas pressure inside the SF6 electrical equipment reaches the set requirement, the control system promptly shuts down the compressor 14 and related valves, stopping the gas injection into the SF6 electrical equipment.

[0037] When the pressure inside the premixed buffer tank 10 is greater than the pressure inside the gas storage tank 15, the SF6 mixed gas inside the premixed buffer tank 10 can enter the gas storage tank 15 through the direct inlet branch pipe III, which helps to save energy consumption in the initial stage of operation of the gas mixing and charging device; when the gas storage tank 15 requires SF6 mixed gas with a higher pressure value, the compressor 14 starts to operate.

[0038] The control system can also be equipped with wireless transmission function to upload the operating status and process data of the electrical equipment mixing and inflation device to the cloud platform so that it can be viewed on PC or mobile phone, and can also realize remote control function.

[0039] Example 2

[0040] like Figure 2 As shown, the gas mixing and charging device for electrical equipment differs from the gas mixing and charging device for electrical equipment in Embodiment 1 in that the outlet of the constant temperature heat exchanger 9 and the inlet of the premixed buffer tank 10 are connected by a spiral mixing pipe 32. The pre-mixed SF6 and N2 or SF6 and CF4 gas discharged from the constant temperature heat exchanger 9 is automatically mixed by the spiral mixing pipe 32 and then enters the premixed buffer tank 10, significantly improving the mixing uniformity of the two component gases, SF6 and N2 or SF6 and CF4.

[0041] Preferably, both the premixed buffer tank 10 and the gas storage tank 15 are vertically oriented tanks, with their air inlets located at the waist level. Two air outlets A, located at the top and bottom of each tank, are connected in parallel to the main pipeline II via a duct B. Connecting ducts at the bottom and top of the tanks before converging on the main pipeline reduces the impact of uneven mixing of the gases within the tanks, further ensuring the uniformity of the gas mixture entering the SF6 electrical equipment.

[0042] More preferably, two compressors 14 are arranged in parallel. This achieves a one-for-one standby function, meaning that if one compressor 14 fails, the other compressor 14 can still operate normally, ensuring the smooth operation of the gas mixing and charging device.

[0043] The working principle of the gas mixing and inflation device for electrical equipment in Example 2 is the same as that of the gas mixing and inflation device for electrical equipment in Example 1.

[0044] This utility model discloses a gas mixing and filling device for electrical equipment. In use, one upstream end of the inlet pipe is connected to an SF6 gas cylinder, and the upstream end of the other inlet pipe is connected to N2 or CF4 gas. When the gas chamber pressure sensor detects that the internal gas pressure of the SF6 electrical equipment is too low and requires gas replenishment, the vacuum pump on the vacuum branch pipe is first used to remove air and moisture from the pipes. Then, the mass flow controllers on the two inlet pipes respectively inject a certain amount of precisely proportioned SF6 and N2 mixture or SF6 and CF4 mixture into the premixed buffer tank. The SF6 mixture in the premixed buffer tank is then filtered and pre-dried by a purification dryer, pressurized by a compressor, and stored in a gas storage tank. The SF6 mixture in the storage tank is then depressurized by a pressure reducing valve and replenished into the gas chamber inside the SF6 electrical equipment. When the gas chamber pressure sensor detects that the internal gas pressure of the SF6 electrical equipment reaches the set requirement, the control system promptly shuts down the compressor and related valves. The system enables the replenishment of SF6 gas into SF6 electrical equipment. It utilizes mass flow controllers on two intake pipes to precisely control the SF6 mixture ratio, ensuring the SF6 concentration is unaffected by changes in ambient temperature, humidity, or pressure. After the initial SF6 and N2 or SF6 and CF4 mixture is introduced into the two intake pipes, it is heated at a constant temperature by a thermostatic heater, ensuring the two components reach the same temperature and meet the filling standard requirements. A premixed buffer tank further blends the introduced SF6 and N2 or SF6 and CF4 mixture, resulting in a highly uniform mixture in the gas storage tank. A gas component detector on the detection branch pipe monitors the actual proportions of each component in the gas mixture in the storage tank in real time, allowing for adjustments to the SF6 and N2 or SF6 and CF4 intake ratios. This adaptive and precise control significantly improves the replenishment efficiency of SF6 electrical equipment.

[0045] Note: The control system can control each actuator through existing control programs, and the control programs are not the innovation of this utility model, so they will not be described in detail here.

[0046] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A gas mixing and inflation device for electrical equipment, characterized in that, The system includes a main pipeline (II), on which a constant temperature heat exchanger (9), a premixed buffer tank (10), a purification dryer (12), a solenoid valve (13), a compressor (14), a gas storage tank (15), a pressure reducing valve (18), a solenoid valve (19), a check valve (20), a gas chamber pressure sensor (21), and a switch interface (22) are sequentially arranged along the air intake direction. Two air intake pipelines (I) are connected in parallel at the upstream end of the main pipeline (II). Each air intake pipeline (I) is equipped with an air intake cylinder, a pressure reducing valve, a pressure gauge, and a mass flow controller sequentially arranged along the air intake direction. A detection branch pipe (IV) and a vacuum branch pipe (VI) are connected in parallel at the downstream end of the main pipeline (II). The upstream ends of the detection branch pipe (IV) and the vacuum branch pipe (VI) are both connected to the main pipeline (II) between the gas storage tank (15) and the pressure reducing valve (18). The downstream end of the detection branch pipe (IV) is connected to... At the downstream end of the vacuum branch pipe (VI), the detection branch pipe (Ⅳ) is provided with a solenoid valve three (23), a pressure reducing valve four (24) and a gas component detector (25) in sequence along the air intake direction. The vacuum branch pipe (VI) is provided with a solenoid valve four (26), a vacuum pump (27) and an exhaust port (28) in sequence along the air intake direction. The premixed buffer tank (10) is provided with a pressure gauge three (11). The gas storage tank (15) is provided with a pressure gauge four (16). The pressure reducing valve, pressure gauge and mass flow controller, pressure gauge three (11), solenoid valve one (13), compressor (14), pressure reducing valve three (18), solenoid valve two (19), check valve one (20), gas chamber pressure sensor (21), solenoid valve four (26), vacuum pump (27), solenoid valve three (23), pressure reducing valve four (24) and gas component detector (25) located on the two air intake pipes (I) are all connected to the control system.

2. The electrical equipment gas mixing and charging device as described in claim 1, characterized in that, It also includes a gas chamber sampling branch pipe (V), one end of which is connected to the detection branch pipe (Ⅳ) between the solenoid valve three (23) and the pressure reducing valve four (24), and the other end is connected to the main pipeline (Ⅱ) between the one-way valve one (20) and the gas chamber pressure sensor (21). The gas chamber sampling branch pipe (V) is equipped with a solenoid valve six (30) connected to the control system.

3. The electrical equipment gas mixing and charging device as described in claim 2, characterized in that, The main pipeline (II) is also equipped with a dryer (17) located between the gas storage tank (15) and the pressure reducing valve (18).

4. The electrical equipment gas mixing and charging device as described in claim 3, characterized in that, The main pipeline (II) is also equipped with a one-way valve II (31) located between the compressor (14) and the gas storage tank (15).

5. The electrical equipment gas mixing and charging device as described in claim 4, characterized in that, It also includes a straight-through intake branch pipe (Ⅲ), one end of which is connected to the main pipeline (Ⅱ) between the purification dryer (12) and the solenoid valve (13), and the other end is connected to the main pipeline (Ⅱ) between the compressor (14) and the one-way valve (31). The straight-through intake branch pipe (Ⅲ) is equipped with a solenoid valve (29) connected to the control system, and the solenoid valve (29) is in the normally open state.

6. The electrical equipment mixing and charging device as described in claim 5, characterized in that, The outlet of the constant temperature heat exchanger (9) and the inlet of the premixed buffer tank (10) are connected by a spiral mixing pipe (32).

7. The electrical equipment gas mixing and inflation device as described in claim 6, characterized in that, The premixed buffer tank (10) and the gas storage tank (15) are both vertically arranged tanks, and the air inlets of both are located at the waist. The two air outlets (A) located at the top and bottom of both are connected in parallel to the main pipeline (II) through a gas guide pipe (B).

8. The electrical equipment mixing and charging device according to any one of claims 1 to 7, characterized in that, One of the aforementioned air intake pipes (Ⅰ) is provided with an air intake cylinder 1 (1), a pressure reducing valve 1 (2), a pressure gauge 1 (3), and a mass flow controller 1 (4) in sequence along the air intake direction. The other of the aforementioned air intake pipes (Ⅰ) is provided with an air intake cylinder 2 (5), a pressure reducing valve 2 (6), a pressure gauge 2 (7), and a mass flow controller 2 (8) in sequence along the air intake direction.

9. The electrical equipment gas mixing and charging device as described in claim 8, characterized in that, Two compressors (14) are arranged side by side.

10. The electrical equipment gas mixing and charging device as described in claim 9, characterized in that, The outer periphery of the premixed buffer tank (10) and the outer periphery of the gas storage tank (15) are both covered with a heat insulation layer.

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