SF6 combined gas charging device and leakage detection method thereof

Abstract

The invention discloses an SF6 combined gas charging device and a leakage detection method thereof, and the device comprises a cabinet body which is internally provided with an inlet gas chamber module, and the inlet gas chamber module is connected with a pressure reduction outlet module; a plurality of gas source inlets are formed in the two opposite side walls of the inlet gas chamber module respectively to form a plurality of channels used for being connected with an external gas source, and the pressure reduction outlet module is provided with a plurality of outlet channels used for outputting gas; gas leakage is detected based on the semiconductor sensor, gas leakage risk prompting is achieved, and on-site safety protection is enhanced; the gas cylinder pressure is monitored in real time, and timely replacement is facilitated when the pressure is insufficient; the high-pressure one-way valve can prevent gas from being reversely inflated, and it is ensured that the inflation process is safe and controllable.

Description

Technical Field

[0001] This invention relates to the field of gas application equipment, and in particular to an SF6 combined gas filling device and its leakage detection method. Background Technology

[0002] Currently, SF6 inflation devices adopt an integrated shell structure without clear functional module division. The components are tightly coupled in space, which is not conducive to the maintenance, repair, and functional expansion of the device. It only has a single gas storage chamber and piston propulsion structure, and the inflation path is relatively simple. It cannot support the simultaneous access of multiple gas sources or the synchronous inflation of two gas chambers, resulting in low on-site operation efficiency. The piston and sliding groove rely on springs and movable plates to achieve airtightness. The structure is simple and lacks an adaptive sealing mechanism under pressure fluctuations. Under long-term use, it is prone to leakage due to wear or deformation. The device does not integrate any gas leakage detection device, so it cannot detect the risk of SF6 leakage in real time, which poses a safety hazard. There is no dedicated storage space for accessories, nor is there a mobile auxiliary structure (such as wheels), which limits the convenience of actual carrying and on-site deployment. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that the current inflation device has the defects of having fewer air passages and poor sealing.

[0004] The above-mentioned technical problems are solved by the following technical solution: This invention proposes an SF6 combined inflation device and its leakage detection method, including, The cabinet has an inlet air chamber module inside, which is connected to a pressure reducing outlet module. The inlet gas chamber module has multiple gas inlets on its opposite side walls, forming multiple channels for connecting to external gas sources, and the pressure reducing outlet module is configured with multiple outlet channels for outputting gas.

[0005] In a preferred embodiment of the SF combined inflation device of the present invention: multiple sets of gas source inlets adopt a double sealing structure, the double sealing structure includes a conical guide portion, and a groove portion is provided on the conical guide portion; the conical guide portion is a conical surface that gradually narrows at the gas source inlet end along the gas flow direction, and an elastic sealing ring is embedded in the groove portion.

[0006] In a preferred embodiment of the SF combined inflation device of the present invention: the pressure reducing outlet module includes a dual outlet channel, the dual outlet channel is connected to a dual intelligent pressure reducing valve, the dual outlet channel is also provided with a throttle valve, and a detection element is connected to the dual outlet channel.

[0007] In a preferred embodiment of the SF combined inflation device of the present invention: the detection element includes a gas sensor, a pressure sensor and a flow sensor respectively installed on two outlet channels. The pressure sensor is used to collect gas pressure data in the outlet channel, and the flow sensor is used to collect gas flow data in the outlet channel.

[0008] In a preferred embodiment of the SF combined inflation device of the present invention, a monitoring module is further included, which includes a first gas monitoring probe and a second gas monitoring probe located at the bottom of the air inlet chamber module.

[0009] In a preferred embodiment of the SF combined inflation device of the present invention: the air source inlet is connected to an inflation module, and the cabinet is provided with a storage module below the inlet air chamber module.

[0010] In a preferred embodiment of the SF combined inflation device of the present invention: the inflation module includes an air tank, the air tank is connected to an air source inlet through an inflation pipeline, the air source inlet is provided with a connecting member, and the air source inlet is connected to the inflation pipeline through the connecting member.

[0011] A method for detecting leaks in an SF6 combined inflation device, comprising the aforementioned SF6 combined inflation device, including, At least two gas sensors are installed in the internal cavity of the pressure reducing outlet module and the internal cavity of the inlet gas chamber module. The gas sensors use SnO2 as the matrix material, and the matrix material is doped with Pt noble metal element, Fe2O3 metal oxide and graphene composite carbon-based material. The gas sensor is heated to a set operating temperature, causing oxygen molecules from the air to adsorb onto the sensor surface and capture free electrons in the conduction band of SnO2, forming O2. - O - Adsorbed oxygen, wait for the sensor resistance to stabilize to the baseline value; The system collects real-time resistance change data from a gas sensor. When SF6 gas leaks onto the sensor surface, SF6 molecules dissociate under the catalysis of Pt to generate F. - F - With SnO2-OH and Sn on the sensor surface 4+ The reaction forms Sn-F bonds, leading to a shift in the electron cloud density and a change in resistance on the sensor surface; The resistance change data is converted into an electrical signal, which is then amplified and processed to drive the audible and visual alarm device to issue a warning signal. Once the leakage source is removed, the Sn-F bonds on the sensor surface decompose at the operating temperature, F⁻ detaches from the sensor surface, and the sensor resistance gradually returns to the baseline value, completing the detection reset.

[0012] In a preferred embodiment of the SF6 combined inflation device leakage detection method of the present invention: when H2S gas is present in the detection environment, H2S reacts with O2 on the sensor surface. - A redox reaction occurs to generate SO2 and H2O, while releasing electrons, which reduces the resistance of n-type SnO2. When SO2 gas is present in the detection environment, SO2 reacts with O- to form SO4² and releases electrons, which also reduces the resistance value of the sensor. By monitoring the direction of the resistance change and the reaction rate, H2S and SO2 can be distinguished.

[0013] In a preferred embodiment of the SF6 combined filling device leakage detection method of the present invention: when CF4 gas is present in the detection environment, CF4 dissociates to generate C at the set operating temperature of the Pt catalyst. 4+ With F - F - It reacts with the material on the sensor surface to form Sn-F bonds, and its detection principle is the same as that of SF6; When HF gas is present in the detection environment, HF directly reacts with SnO2-OH on the sensor surface to undergo a proton transfer reaction, generating SnO2-F and H2O. At the same time, the capture of electrons causes a change in the sensor resistance. The temperature conditions required for the reaction can be used to distinguish between CF4 and HF.

[0014] The beneficial effects of this invention are as follows: each functional module is spatially independent and hierarchically distinct, which facilitates assembly, inspection and maintenance, and improves the standardization and convenience of overall equipment management; the centralized storage of inflation pipelines and other accessories enhances the portability of the equipment, making it suitable for various work sites and improving work efficiency. Through a three-layer composite seal, pressure adaptive gap compensation is achieved, ensuring stable sealing performance under different working conditions and effectively preventing gas leakage; it supports simultaneous access of ten gas sources and synchronous inflation of dual gas chambers, significantly improving on-site operation efficiency; the "H"-shaped pressure reducing gas path channel has independent operation and mutual backup capabilities, and the failure of a single pressure reducing valve will not affect continuous on-site work, ensuring the continuity of operation; Based on semiconductor sensors, gas leaks are detected, enabling gas leak risk alerts and enhancing on-site safety protection; real-time monitoring of gas cylinder pressure facilitates timely replacement when pressure is insufficient; and a high-pressure one-way valve prevents backfilling of gas, ensuring a safe and controllable filling process. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 A schematic diagram of the SF6 combined inflation device is shown. Figure 2 A schematic diagram of the cabinet structure in the SF6 combined inflation device is shown; Figure 3 A schematic diagram of the detection component in the SF6 combined inflation device is shown. Figure 4 A schematic diagram of the inflation module in the SF6 combined inflation device is shown. Figure 5 A schematic diagram of the monitoring module in the SF6 combined inflation device is shown. Figure 6 A schematic diagram of the gas source inlet in the SF6 combined inflation device is shown. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0018] Reference Figures 1-6 This embodiment provides an SF6 combined inflation device, including a cabinet 1, which has an inlet air chamber module 2 inside, and the inlet air chamber module 2 is connected to a pressure reduction outlet module 3; Multiple gas inlets 21 are respectively provided on the opposite side walls of the inlet gas chamber module 2, forming multiple channels for connecting to external gas sources, and multiple outlet channels for outputting gas are configured on the pressure reducing outlet module 3. Cabinet 1 is a rectangular sealed structure made of high-strength aluminum alloy. The outer wall is equipped with a handle 12 for easy handling. Each of the four corners of the bottom is equipped with an anti-slip roller 11 with a braking mechanism, which can move smoothly on uneven surfaces such as gravel roads and lawns. When working on slopes, it can be fixed by braking to prevent slippage. The inlet gas chamber module 2 is fixedly installed in the upper middle area inside the cabinet 1, forming a sealed gas chamber. The main body of the inlet gas chamber module 2 adopts a three-layer composite sealing structure, which consists of an aluminum alloy substrate layer, a shape memory alloy compensation ring layer, and a PTFE sealing layer from the outside to the inside. When the gas pressure inside the inlet gas chamber module 2 increases, the shape memory alloy compensation ring expands and deforms under the pressure of the gas, filling the gap between the PTFE sealing layer and the aluminum alloy substrate layer formed by pressure deformation. When the internal pressure decreases, the shape memory alloy compensation ring contracts and returns to its original position, maintaining a tight fit with the PTFE sealing layer. The inner wall of the gas chamber is treated with anti-corrosion. Five gas source inlets 21 are evenly arranged on the opposite side walls of the inlet gas chamber module 2, forming a total of ten channels for connecting to external gas sources. Each gas source inlet 21 is equipped with a quick-connect structure. The pressure reducing outlet module 3 is equipped with two outlet channels for outputting gas, and each outlet channel is equipped with an independent control valve.

[0019] Furthermore, all sets of gas inlets 21 adopt a double sealing structure. The double sealing structure includes a conical guide part 22, and a groove part 23 is provided on the conical guide part 22. The conical guide part 22 is a conical surface that gradually narrows at the end of the gas inlet 21 along the gas flow direction, and an elastic sealing ring is embedded in the groove part 23. Multiple gas inlets 21 all adopt a double sealing structure, which includes an integrally formed conical guide part 22 and a groove part 23. The conical guide part 22 is a tapered surface that gradually narrows along the gas inflow direction at the end of the gas inlet 21. The taper of the tapered surface is set to 30°-45° and the surface is polished. It can guide the external gas source connector to quickly and accurately align and reduce docking deviation. The groove part 23 is an annular groove opened on the outer surface of the conical guide part 22. The cross-section of the annular groove is U-shaped, with a groove depth of 2-3mm and a groove width of 3-4mm. A high-pressure resistant and SF6 corrosion resistant fluororubber elastic sealing ring is embedded in the annular groove. The cross-sectional diameter of the sealing ring is slightly larger than the groove depth. When the external connector is docked with the gas inlet 21, the sealing ring is squeezed and deformed, tightly fitting the inner wall of the connector and the side wall of the groove to form a reliable seal and prevent gas from leaking from the interface gap.

[0020] Furthermore, the pressure reducing outlet module 3 includes a dual outlet channel 31, which is connected to a dual intelligent pressure reducing valve 32. A throttle valve is also provided in the dual outlet channel 31, and a detection element 33 is connected to the dual outlet channel 31. The dual-outlet channel 31 consists of two parallel metal pipes, each with an inner diameter of 8-12mm. The outer walls are wrapped with a heat insulation layer to prevent gas temperature changes from affecting pressure stability. The dual-channel intelligent pressure reducing valve 32 has an "H"-shaped structure. Its input end is connected to the gas chamber of the inlet gas chamber module 2, and its output end is connected to the two outlet channels respectively. The two pressure reducing channels can operate independently. If one pressure reducing valve fails, the other can be put into use immediately to ensure continuous gas filling. The throttle valve is an electromagnetically controlled throttle valve core, installed near the pressure reducing valve in each outlet channel. The opening size of the valve core can be adjusted by an electrical signal to achieve precise control of gas flow.

[0021] Furthermore, the detection element 33 includes a gas sensor 331, a pressure sensor 333, and a flow sensor 332 respectively installed on the two outlet channels. The pressure sensor 333 is used to collect gas pressure data in the outlet channel, and the flow sensor 332 is used to collect gas flow data in the outlet channel. The pressure sensor 333 has a measurement range of 0-1.6MPa and an accuracy class of 0.2, and is used to collect gas pressure data in the outlet channel in real time; the flow sensor (332) has a measurement range of 0-50L / min and an accuracy of ±2%FS, and is used to collect gas flow data in the outlet channel; the control circuit board is installed on the side wall of the pressure reducing outlet module 3, with a size not exceeding 5cm×3cm×2cm, and is electrically connected to the pressure sensor (333), the flow sensor 332, the throttle valve and the touch panel 13 respectively; Gas sensors 331 are installed on the inner wall of the dual-outlet channel 31 and in the internal cavity of the pressure reducing outlet module 3, with two gas sensors 331 installed in each outlet channel in a symmetrical distribution. The probe surface of the gas sensor 331 is treated with a nano-coating to enhance the adsorption sensitivity of SF6 gas. The operating temperature of the gas sensor 331 is set to 200-300℃, with a response time ≤10s and a recovery time ≤30s. It can detect whether there is SF6 gas leakage in the outlet channel and pressure reducing module in real time. When a leakage is detected, it immediately sends a signal to the control circuit board. The touch panel 13 is located on the outer wall of the cabinet 1. It can set the inflation pressure threshold and flow range, and display the pressure, flow data and equipment working status in real time.

[0022] Furthermore, it also includes a monitoring module 4, which includes a first gas monitoring probe 41 and a second gas monitoring probe 42 located at the bottom of the air inlet chamber module; The first gas monitoring probe 41 and the second gas monitoring probe 42 are respectively installed on both sides of the bottom of the inlet gas chamber module 2. The probe's detection end extends into the gas cavity of the inlet gas chamber module 2. The signal processing unit is electrically connected to the two gas monitoring probes and can receive the resistance change signal transmitted by the probes, convert it into a digital signal, amplify and filter it, and then compare it with the preset leakage concentration threshold. The audible and visual alarm device is installed on the top of the cabinet 1, including a red warning light and a buzzer. When the signal processing unit determines that there is a leak, it immediately drives the warning light to flash (flash frequency 2 times / second), and at the same time the buzzer emits an intermittent alarm sound (volume ≥80dB). The alarm signal can be transmitted to the staff's mobile terminal through the wireless module to realize remote early warning.

[0023] Furthermore, the gas inlet 21 is connected to the inflation module 5, and the cabinet 1 is located below the inlet gas chamber module 2 and has a storage module 6. The monitoring module 4 is installed inside the cabinet 1 in the area between the inlet gas chamber module 2 and the storage module 6 to detect SF6 gas leakage in real time. The storage module 6 has a drawer-type structure and is located at the bottom of the cabinet 1. The interior forms a layered and enclosed storage space, which can be used to store the inflation pipeline 52, connectors, tools and other accessories in a classified manner. Furthermore, the inflation module 5 includes an air tank 51, which is connected to the air source inlet 21 via an inflation pipe 52. The air source inlet 21 is provided with a connecting piece, and the air source inlet 21 is connected to the inflation pipe 52 via the connecting piece. Gas cylinder 51 is a high-pressure SF6 gas cylinder with a rated working pressure of 15MPa and a volume of 40L. The cylinder is equipped with an anti-tipping bracket on the outside, and the bottom of the bracket is equipped with an anti-slip pad at the point of contact with the ground. The filling pipeline 52 is made of rubber and steel wire composite pipe with an inner diameter of 10-15mm and a wall thickness of 3-5mm. It has the characteristics of high pressure resistance (≥20MPa), aging resistance, and SF6 corrosion resistance. The pipeline length can be selected from 5-10m according to the operation requirements. The connecting components include a quick-connect self-sealing male connector 531 that quickly connects to the gas inlet 21. A high-pressure one-way ball valve 532 is installed between the quick-connect self-sealing male connector 531 and the gas inlet 21. A quick-connect self-sealing female connector 533 is installed at the end of the inflation pipeline 52. A sealing gasket is installed at the interface to ensure a tight connection. The rated working pressure of the high-pressure one-way ball valve 532 is ≥20MPa. The valve body is made of stainless steel, the valve core is a spherical structure, and the operating handle 12 is designed with anti-slip. The pipeline can be opened and closed by rotating the handle 12. The one-way ball valve can only be used from the gas tank 51 to the inlet gas chamber module 2, which can effectively prevent gas from being backfilled into the gas tank 51. The pressure gauge has a measuring range of 0-20MPa, an accuracy class of 0.4, a dial diameter of 80mm, and clear and easy-to-read scale. The pressure gauge is connected to the pipeline via a three-way connector and is equipped with a shut-off valve. When the pressure gauge needs to be replaced, the shut-off valve can be closed without disconnecting the entire inflation pipeline 52, which is convenient for maintenance.

[0024] A method for detecting leaks in an SF6 combined inflation device, comprising the aforementioned SF6 combined inflation device, including, At least two gas sensors 331 are installed in the internal cavity of the pressure reducing outlet module 3 and the internal cavity of the inlet gas chamber module 2. The gas sensors 331 are based on SnO2, and the base material is doped with Pt noble metal element, Fe2O3 metal oxide and graphene composite carbon-based material. Initialize the equipment and check the connection status of the pressure reducing outlet module 3, the inlet gas chamber module 2, and the monitoring module 4 to ensure that all components are securely installed and the pipelines are undamaged. Turn on the power of cabinet 1, start the control circuit board and monitoring module 4, and preheat all gas sensors 331 for 5-10 minutes until the sensors reach the set working temperature (200-300℃). The gas sensor 331 is heated to a set operating temperature, causing oxygen molecules from the air environment to adsorb onto the sensor surface and capture free electrons in the conduction band of SnO2, forming O2. - O - Adsorbed oxygen, wait for the sensor resistance to stabilize to the baseline value; Establish a detection benchmark. In a clean air environment without SF6 gas, after the operating temperature of the gas sensor 331 stabilizes, continuously collect the resistance value of the sensor, record 5-10 sets of data, take the average value as the resistance baseline value, and store the baseline value in the memory of the control circuit board as the benchmark for subsequent leakage judgment. The resistance change data of gas sensor 331 is collected in real time. When SF6 gas leaks to the sensor surface, SF6 molecules dissociate into F under the catalysis of Pt. - F - With SnO2-OH and Sn on the sensor surface 4+The reaction forms Sn-F bonds, leading to a shift in the electron cloud density and a change in resistance on the sensor surface; Real-time monitoring, start the inflation module 5, open the outlet valve of gas tank 51 and the high-pressure one-way ball valve 532, SF6 gas enters the inlet gas chamber module 2 through the inflation pipeline 52 and gas source inlet 21, and is then depressurized and regulated by the pressure reducing outlet module 3 before being output from the outlet channel. During this process, each gas sensor 331 collects the gas composition information of the area in real time and transmits the resistance change data to the signal processing unit of the control circuit board and monitoring module 4 in real time. The resistance change data is converted into an electrical signal, which is then amplified and processed to drive the audible and visual alarm device to issue a warning signal. Leakage detection and early warning: When SF6 gas leaks to the sensor surface, SF6 molecules dissociate under the catalysis of Pt to generate F. - F - It reacts with SnO2-OH on the sensor surface to generate SnO2-F and OH. - At the same time with Sn 4+ The Sn-F bonds are formed, and the strong electronegativity of the Sn-F bonds causes the electron cloud density on the sensor surface to shift towards the F-F direction. - When the sensor shifts, the concentration of free electrons in the conduction band decreases, and the sensor resistance value increases compared to the baseline value. The control circuit board and signal processing unit compare the real-time resistance value with the baseline value. When the resistance change rate exceeds 5%, it is determined that there is an SF6 gas leak. The audible and visual alarm device is immediately activated, and the time, location, and resistance change curve of the leak are recorded. Once the leakage source is removed, the Sn-F bonds on the sensor surface decompose at the operating temperature, F⁻ detaches from the sensor surface, and the sensor resistance gradually returns to the baseline value, completing the detection reset.

[0025] Reset and repeat testing: After the staff has identified and eliminated the leak source, the inflation module 5 is shut off, while the gas sensor 331 continues to operate. The Sn-F bonds on the sensor surface decompose at the operating temperature. - Detach from the sensor surface and react with OH in the air - Combined with the generation of HF (HF is discharged with the air), the sensor resistance gradually recovers to the baseline value. When the resistance value stabilizes within ±2% of the baseline value, the detection reset is completed, and the equipment can be put back into inflation operation to achieve cyclic detection.

[0026] When H2S gas is present in the detection environment, H2S reacts with O2 on the sensor surface. - A redox reaction occurs to generate SO2 and H2O, while releasing electrons, which reduces the resistance of n-type SnO2. When SO2 gas is present in the detection environment, SO2 reacts with O- to form SO4² and releases electrons, which also reduces the resistance value of the sensor. By monitoring the direction of the resistance change and the reaction rate, H2S and SO2 can be distinguished.

[0027] When H2S gas is present in the detection environment, H2S gas molecules will preferentially adsorb onto the surface of the gas sensor (331), and react with O2 on the sensor surface at the operating temperature. - (Adsorbed oxygen) undergoes a redox reaction, the reaction equation being H₂S(ads) + 3O₂ - (ads)→SO2(g)+H2O(g)+3e - During the reaction, electrons released enter the conduction band of SnO2, increasing the carrier concentration of n-type SnO2 and decreasing its resistance. The rate of change in resistance is typically 10%-15%. When SO2 gas is present in the detection environment, SO2 molecules react with O2... - The reaction produces SO4 2- The reaction equation is SO 2 (ads) + 2O - (ads) → SO4 2- (ads) + 2e - Similarly, the release of electrons causes a decrease in the sensor resistance, but the resistance change rate is 5%-10%, and the reaction rate is slower than that of H2S (response time ≥15s). By monitoring the difference between the resistance change rate and the response time, it is possible to distinguish whether the detected object is H2S or SO2. At the same time, the control circuit board will display the corresponding gas type and concentration estimate on the touch panel 13.

[0028] When CF4 gas is present in the detection environment, CF4 dissociates to form C at the set operating temperature of the Pt catalyst. 4+ With F - F - It reacts with the material on the sensor surface to form Sn-F bonds, and its detection principle is the same as that of SF6; When HF gas is present in the detection environment, HF directly reacts with SnO2-OH on the sensor surface to undergo a proton transfer reaction, generating SnO2-F and H2O. At the same time, the capture of electrons causes a change in the sensor resistance. The temperature conditions required for the reaction can be used to distinguish between CF4 and HF.

[0029] When CF4 gas is present in the detection environment, due to the stable molecular structure of CF4, it requires Pt catalysis and a set operating temperature (200-300℃) to dissociate. The dissociation reaction equation is CF4(g) → C 4+ (ads) +4F - (ads), generated F - With SnO2-OH and Sn on the sensor surface 4+The reaction forms Sn-F bonds, leading to an increase in sensor resistance. The trend and rate of change in resistance are consistent with SF6 gas. It is necessary to determine whether there is a CF4 leak based on the on-site operating environment (e.g., whether equipment containing CF4 is being used simultaneously). When HF gas is present in the detection environment, HF, being a strongly polar molecule, can directly adsorb onto the SnO2-OH hydroxyl sites on the sensor surface without high-temperature catalysis, undergoing a proton transfer reaction. The reaction equation is: HF(g) + SnO2-OH (surface) → SnO2-F (surface) + H2O(ads) + e - During the reaction, electrons are captured, which increases the resistance of the sensor. HF is also adsorbed quickly (response time ≤ 5s) with a resistance change rate ≥ 20%, which is significantly different from the detection characteristics of SF6 and CF4. By comparing the required temperature conditions, response time, and resistance change rate, CF4 and HF gases can be accurately distinguished, avoiding misjudgment.

[0030] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. An SF6 combined inflation device and its leakage detection method, characterized in that: include, The cabinet (1) has an inlet air chamber module (2) inside, and the inlet air chamber module (2) is connected to a pressure reducing outlet module (3). The inlet gas chamber module (2) has multiple gas source inlets (21) on its opposite side walls, forming multiple channels for connecting to external gas sources. The pressure reducing outlet module (3) is configured with multiple outlet channels for outputting gas.

2. The SF6 combined inflation device and its leakage detection method according to claim 1, characterized in that: All of the gas source inlets (21) adopt a double sealing structure. The double sealing structure includes a conical guide (22) and a groove (23) is provided on the conical guide (22). The conical guide (22) is a conical surface that gradually narrows at the end of the gas source inlet (21) along the gas flow direction. An elastic sealing ring is embedded in the groove (23).

3. The SF6 combined inflation device and its leakage detection method according to claim 2, characterized in that: The pressure reducing outlet module (3) includes a dual outlet channel (31), which is connected to a dual intelligent pressure reducing valve (32). A throttle valve is also provided in the dual outlet channel (31), and a detection element (33) is connected to the dual outlet channel (31).

4. The SF6 combined inflation device and its leakage detection method according to claim 3, characterized in that: The detection element (33) includes a gas sensor (331), a pressure sensor (333), and a flow sensor (332) respectively installed on the two outlet channels. The pressure sensor (333) is used to collect gas pressure data in the outlet channel, and the flow sensor (332) is used to collect gas flow data in the outlet channel.

5. The SF6 combined inflation device and its leakage detection method according to claim 4, characterized in that: It also includes a monitoring module (4), which includes a first gas monitoring probe (41) and a second gas monitoring probe (42) located at the bottom of the air inlet chamber module.

6. The SF6 combined inflation device and its leakage detection method according to claim 5, characterized in that: The gas inlet (21) is connected to the gas filling module (5), and the cabinet (1) is located below the inlet gas chamber module (2) and has a storage module (6).

7. The SF6 combined inflation device and its leakage detection method according to claim 6, characterized in that: The inflation module (5) includes an air tank (51), which is connected to an air source inlet (21) via an inflation pipeline (52). The air source inlet (21) is provided with a connecting piece, which is connected to the inflation pipeline (52) via the connecting piece.

8. A method for detecting leakage in an SF6 combined inflation device, comprising the SF6 combined inflation device according to any one of claims 1-7, characterized in that: include, At least two gas sensors (331) are installed in the internal cavity of the pressure reducing outlet module (3) and the internal cavity of the inlet gas chamber module (2). The gas sensors (331) are based on SnO2, and the base material is doped with Pt noble metal element, Fe2O3 metal oxide and graphene composite carbon base material. heating the gas sensor (331) to a set operating temperature, causing oxygen molecules in the air environment to adsorb onto the sensor surface and capture free electrons in the Sn02 conduction band, forming O2 - , O - adsorbed oxygen, waiting for the sensor resistance to stabilize to a baseline value; Real-time acquisition of resistance change data of the gas sensor (331), when SF6 gas leaks to the surface of the sensor, SF6 molecules are dissociated under the catalysis of Pt to generate F - , - React with SnO2-OH, Sn 4+ On the surface of the sensor to form Sn-F bonds, causing the electron cloud density of the sensor surface to shift, resulting in a change in resistance; The resistance change data is converted into an electrical signal, which is then amplified and processed to drive the audible and visual alarm device to issue a warning signal. Once the leakage source is removed, the Sn-F bonds on the sensor surface decompose at the operating temperature, F⁻ detaches from the sensor surface, and the sensor resistance gradually returns to the baseline value, completing the detection reset.

9. The leakage detection method for the SF6 combined inflation device according to claim 8, characterized in that: When H2S gas is present in the detection environment, H2S reacts with O2 on the sensor surface. - A redox reaction occurs to generate SO2 and H2O, while releasing electrons, which reduces the resistance of n-type SnO2. When SO2 gas is present in the detection environment, SO2 reacts with O- to form SO4² and releases electrons, which also reduces the resistance value of the sensor. By monitoring the direction of the resistance change and the reaction rate, H2S and SO2 can be distinguished.

10. The leakage detection method for the SF6 combined inflation device according to claim 9, characterized in that: When CF4 gas is present in the detection environment, CF4 dissociates to form C at the set operating temperature of the Pt catalyst. 4+ With F - F - It reacts with the material on the sensor surface to form Sn-F bonds, and its detection principle is the same as that of SF6; When HF gas is present in the detection environment, HF directly reacts with SnO2-OH on the sensor surface to undergo a proton transfer reaction, generating SnO2-F and H2O. At the same time, the capture of electrons causes a change in the sensor resistance. The temperature conditions required for the reaction can be used to distinguish between CF4 and HF.

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