SF6 gas leakage monitoring and alarming device

Abstract

The present application relates to the technical field of gas detection, in particular to a SF6 gas leakage monitoring and alarming device, which comprises an outer shell body, a step motor, a threaded rod, a large gear with missing teeth, a small tooth ring and a nut block in a driving calibration assembly are cooperated to drive a sealing column to slide accurately inside a sealing sleeve, to realize accurate switching of a through hole, a collection pipe, a clean gas pipe and a SF6 standard gas pipe, without the need for manual external standard gas and manual switching of the gas circuit, to complete zero point and range calibration of the SF6 monitoring sensor, the cooperation of a limiting rod and a connecting frame can limit and guide the sealing column, to avoid deviation during gas circuit switching, the sliding sealing structure of the sealing sleeve and the sealing column can prevent gas leakage, to ensure calibration accuracy, at the same time, the clean gas tank and the SF6 standard gas tank can realize long-term gas preservation and convenient replenishment, to greatly reduce the frequency of manual maintenance, to solve the problems of detection distortion, false alarm and missed alarm caused by untimely manual calibration, to meet the long-term stable monitoring requirements.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, specifically to an SF6 gas leak monitoring and alarm device. Background Technology

[0002] Existing SF6 gas leak monitoring and alarm devices are mainly used in power equipment, chemical, and other scenarios to monitor SF6 gas leaks, ensuring normal equipment operation and personnel safety. Their monitoring principle involves collecting gas from the external environment through a collection module on the outer casing, then delivering the gas through a conduit to a measuring chamber inside the device. The SF6 monitoring sensor inside the measuring chamber directly contacts the gas, analyzing SF6 concentration through contact detection. The detection signal is processed by the acquisition and analysis module and displayed on the display module. When the detected SF6 concentration exceeds the standard, the alarm sounds. Some devices are fixed in a designated location using a mounting bracket for continuous monitoring at a fixed point. The overall structure revolves around gas collection, contact detection, signal processing, and alarm functions, representing the mainstream approach for SF6 leak monitoring.

[0003] Existing SF6 gas leak monitoring and alarm devices have significant technical shortcomings, the core issue being the inability to perform automatic calibration. SF6 monitoring sensors are in constant contact with external gases, and factors such as impurities in the gas and aging of components can cause detection deviations, leading to decreased accuracy. Therefore, regular sensor calibration is necessary to ensure accurate results. However, existing devices rely on manual calibration, requiring manual connection of external standard gas and manual switching of gas paths, which is cumbersome. Furthermore, manual calibration cannot be triggered in real time, making it difficult to promptly correct errors caused by sensor drift, resulting in detection distortion, false alarms, or missed alarms, and failing to meet the requirements for long-term stable monitoring. Summary of the Invention

[0004] The purpose of this invention is to provide an SF6 gas leak monitoring and alarm device to solve the problems mentioned in the background art, such as the reliance on manual calibration, cumbersome operation, and untimely calibration leading to sensor detection deviation, detection distortion, false alarms and missed alarms, which cannot meet the requirements of long-term stable monitoring.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an SF6 gas leak monitoring and alarm device, comprising a housing, a display module fixed to the outside of one side of the housing, and a mounting bracket fixed to the outside of the other side of the housing. A collection module is fixedly fixed through the bottom end of the housing, and a mounting bracket is fixedly installed inside the bottom end of the housing. A sealing sleeve is fixed to one end of the mounting bracket, and a sealing column is slidably and sealingly installed inside one end of the sealing sleeve. A data acquisition and analysis module is fixed to one side of the mounting bracket. A drive calibration component is configured outside the sealing column near the opening end of the sealing sleeve. A measuring gas chamber is formed inside the sealing column, and an SF6 monitoring sensor is fixed to the inner wall of one side of the measuring gas chamber. A reset shielding component is provided inside the measuring gas chamber, and an alarm is fixed to the outside of the housing. The drive calibration component includes a stepper motor and a threaded rod. The stepper motor is fixedly installed outside the mounting bracket, and the threaded rod is fixedly installed outside the sealing column.

[0006] Furthermore, a through hole is provided between the outside of the sealing column and the inside of the measuring gas chamber, and a collection tube is fixedly connected to the inside of the sealing sleeve near the through hole. The input end of the collection tube is fixedly connected to the output end of the collection module.

[0007] Furthermore, a clean gas conduit is fixedly connected inside the side of the sealing sleeve near the collecting pipe, and a clean gas cylinder is fixedly connected at the end of the clean gas conduit away from the sealing sleeve. A first gas injection pipe is fixedly connected to the top of the clean gas cylinder.

[0008] Furthermore, an SF6 standard gas conduit is fixedly connected to the inside of the sealing sleeve near the clean gas conduit, and an SF6 standard gas cylinder is fixedly connected to the end of the SF6 standard gas conduit away from the sealing sleeve. A second gas injection pipe is fixedly connected to the top of the SF6 standard gas cylinder, and one end of both the first and second gas injection pipes is fixedly inserted through the outside of the outer shell.

[0009] Furthermore, both the first and second gas injection pipes have valves fixedly connected to their outer ends located outside the outer shell. Both the clean gas tank and the SF6 standard gas tank are fitted with fixed positioning frames, one end of which is fixedly installed on the inner wall of the outer shell.

[0010] Furthermore, a support frame is fixedly installed on the side of the fixed frame near the stepper motor, and a nut block is rotatably engaged inside one side of the support frame. The nut block and the threaded rod are connected by a through thread, and a large missing gear is fixedly installed at the output end of the stepper motor.

[0011] Furthermore, a small toothed ring is fixedly fitted on the outside of the nut block, and the small toothed ring meshes with the large missing gear. A limit rod is slidably installed inside the support frame on the side away from the large missing gear. One end of the limit rod is fixedly installed on the outside of one side of the sealing column. A connecting frame is fixedly connected between the limit rod and the end of the threaded rod away from the sealing column.

[0012] Furthermore, the reset shielding assembly includes a sealing block, which is slidably and sealingly fitted to the inner wall of the measuring gas chamber near the through hole. Limiting push rods are fixedly installed through both sides of the sealing block, and both ends of the limiting push rods are slidably and sealingly inserted through both ends of the sealing column.

[0013] Furthermore, a reset pressure plate is fixedly installed at the end of the limiting push rod near the large missing gear, and a trigger pressure plate is fixedly installed at the end of the limiting push rod away from the reset pressure plate.

[0014] Furthermore, a positioning rod is fixedly installed on the side of the fixing frame near the reset pressure plate, and an abutment plate is fixedly installed on the end of the positioning rod near the reset pressure plate, with one side of the abutment plate fitting against one side of the reset pressure plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up the drive calibration component, the core defects of existing devices, such as the inability to achieve automatic calibration and the cumbersome reliance on manual operation, are effectively solved. The stepper motor, threaded rod, large notched gear, small gear ring, and nut block in the drive calibration component work together to drive the sealing column to slide precisely inside the sealing sleeve, realizing the precise switching between the through hole and the collection pipe, the clean gas conduit, and the SF6 standard gas conduit. The zero point and range calibration of the SF6 monitoring sensor can be completed without the need for manual connection of external standard gas or manual switching of gas paths. The cooperation between the limit rod and the connecting frame can limit and guide the sealing column to prevent displacement during gas path switching. The sliding sealing structure of the sealing sleeve and the sealing column can prevent gas leakage and ensure calibration accuracy. At the same time, the clean gas tank and the SF6 standard gas tank can realize long-term gas storage and convenient replenishment, which can significantly reduce the cost of manual maintenance and solve the problems of detection distortion, false alarms and missed alarms caused by untimely manual calibration, thus meeting the needs of long-term stable monitoring.

[0016] 2. By setting up the reset shielding component, the automatic calibration and reset process is further optimized, making up for the hidden defects of gas waste and gas path cross-mixing after calibration in the existing device. The sealing block, limit push rod, reset pressure plate and contact plate in the reset shielding component achieve mechanical linkage based on the movement stroke of the sealing column. Without the need for additional drive components, the automatic sealing and unlocking of the through hole can be completed. After calibration, the trigger pressure plate abuts against the inner wall of the sealing sleeve, pushing the sealing block to seal the through hole, which can avoid secondary contact between the measuring gas chamber and various gases, and eliminate gas waste and cross-mixing. During reset, the reset pressure plate abuts against the contact plate, driving the sealing block to unlock, ensuring accurate connection between the through hole and the collection tube, ensuring that the device can quickly resume normal detection, while avoiding sealing block jamming and through hole wear, improving the device's operational stability and component lifespan, and forming a complete closed loop in conjunction with the drive calibration component. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the outer shell and mounting bracket of the present invention; Figure 3 This is a schematic diagram of the overall and partial cross-sectional three-dimensional structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a three-dimensional structural diagram of the fixing frame and sealing sleeve of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B; Figure 7 This is a partial cross-sectional three-dimensional structural schematic diagram of the sealing sleeve and sealing column of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram at point C; Figure 9 This is a partial cross-sectional three-dimensional structural schematic diagram of the sealing column and measuring gas chamber of the present invention; Figure 10 This is a three-dimensional structural diagram of the sealing block and the limiting push rod of the present invention.

[0018] In the attached diagram, the components represented by each number are as follows: 1. Outer shell; 2. Display module; 3. Mounting bracket; 4. Collection module; 5. Fixing bracket; 6. Sealing sleeve; 7. Data acquisition and analysis module; 8. Collection pipe; 9. Sealing column; 10. Measuring gas chamber; 11. SF6 monitoring sensor; 12. Through hole; 13. Support frame; 14. Stepper motor; 15. Large notch gear; 16. Limiting rod; 17. Threaded rod; 18. Connecting frame; 19. Nut block; 20. Small toothed ring; 21. Positioning frame; 22. Clean gas tank; 23. First gas injection pipe; 24. Valve; 25. Clean gas conduit; 26. SF6 standard gas tank; 27. SF6 standard gas conduit; 28. Second gas injection pipe; 29. ​​Sealing block; 30. Limiting push rod; 31. Trigger plate; 32. Reset plate; 33. Positioning rod; 34. Contact plate; 35. Alarm. Detailed Implementation

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

[0020] Example 1: Please refer to Figure 1 - Figure 9 An SF6 gas leak monitoring and alarm device includes a housing 1, a display module 2 fixed to the outside of one side of the housing 1, and a mounting bracket 3 fixed to the outside of the other side of the housing 1. A collection module 4 is fixedly fixed through the bottom end of the housing 1. A mounting bracket 5 is fixedly installed inside the bottom end of the housing 1. A sealing sleeve 6 is fixed to one end of the mounting bracket 5. A sealing column 9 is slidably and sealingly installed inside one end of the sealing sleeve 6. An acquisition and analysis module 7 is fixed to one side of the mounting bracket 5. A drive calibration component is configured on the outside of the sealing column 9 near the opening end of the sealing sleeve 6. A measuring gas chamber 10 is opened inside the sealing column 9. An SF6 monitoring sensor 11 is fixed on the inner wall of one side of the measuring gas chamber 10. An alarm 35 is fixed to the outside of the housing 1. The drive calibration component includes a stepper motor 14 and a threaded rod 17. The stepper motor 14 is fixedly installed outside the mounting bracket 5, and the threaded rod 17 is fixedly installed outside the sealing column 9.

[0021] A through hole 12 is provided between the outside of the sealing column 9 and the inside of the measuring gas chamber 10. A collection tube 8 is fixedly connected to the inside of the sealing sleeve 6 near the through hole 12. The input end of the collection tube 8 is fixedly connected to the output end of the collection module 4.

[0022] A clean gas conduit 25 is fixedly connected inside the side of the sealing sleeve 6 near the collecting pipe 8. A clean gas tank 22 is fixedly connected to the end of the clean gas conduit 25 away from the sealing sleeve 6. A first gas injection pipe 23 is fixedly connected to the top of the clean gas tank 22.

[0023] An SF6 standard gas conduit 27 is fixedly connected inside the side of the sealing sleeve 6 near the clean gas conduit 25. An SF6 standard gas cylinder 26 is fixedly connected at the end of the SF6 standard gas conduit 27 away from the sealing sleeve 6. A second gas injection pipe 28 is fixedly connected to the top of the SF6 standard gas cylinder 26. One end of the first gas injection pipe 23 and the second gas injection pipe 28 are both fixed to the outside of the outer shell 1.

[0024] The first gas injection pipe 23 and the second gas injection pipe 28 are both fixedly connected to valves 24 at one end outside the outer shell 1. The clean gas tank 22 and the SF6 standard gas tank 26 are both fitted with positioning frames 21, one end of which is fixedly installed on the inner wall of the outer shell 1.

[0025] A support frame 13 is fixedly installed on the side of the fixed frame 5 near the stepper motor 14. A nut block 19 is rotatably engaged on one side of the support frame 13. The nut block 19 and the threaded rod 17 are connected by a through thread. A large notched gear 15 is fixedly installed at the output end of the stepper motor 14.

[0026] A small toothed ring 20 is fixedly fitted on the outside of the nut block 19. The small toothed ring 20 is meshed with the large missing gear 15. A limit rod 16 is slidably installed inside the support frame 13 on the side away from the large missing gear 15. One end of the limit rod 16 is fixedly installed on the outside of the sealing column 9. A connecting frame 18 is fixedly connected between the limit rod 16 and the end of the threaded rod 17 away from the sealing column 9.

[0027] In this embodiment, during the factory commissioning phase, staff will fill the clean gas tank 22 and the SF6 standard gas tank 26 with the specified specifications of clean gas and SF6 standard gas respectively through the first gas injection pipe 23 and the second gas injection pipe 28. After filling, the valve 24 will be closed to achieve sealed storage of the gas tanks. Both the clean gas tank 22 and the SF6 standard gas tank 26 are equipped with intelligent pressure sensors, which can monitor the gas pressure inside the tank in real time and feed the pressure data back to the acquisition and analysis module 7. Staff can view the pressure status through the display module 2. When the gas pressure inside the tank is lower than the preset threshold, gas can be replenished again through the corresponding gas injection pipe to ensure the smooth progress of the calibration process. At the same time, the positioning frame 21 plays a stabilizing and limiting role for the clean gas tank 22 and the SF6 standard gas tank 26, preventing the gas tanks from shaking during the operation of the device, which could lead to loose gas circuit connections and gas leakage, thus improving the overall stability of the device.

[0028] When the device is in normal use, the outer casing 1 is fixed at the designated monitoring position by the mounting bracket 3. Gas in the external environment is collected by the existing collection module 4 at the bottom of the outer casing 1. The collected gas is then transported to the inside of the sealing sleeve 6 through the collection pipe 8. At this time, the sealing column 9 is in the initial position, and the through hole 12 on the sealing column 9 is connected to the collection pipe 8. The gas enters the measuring gas chamber 10 inside the sealing column 9 through the through hole 12. The SF6 monitoring sensor 11 on the inner wall of the measuring gas chamber 10 is in direct contact with the gas. Real-time detection of SF6 gas concentration is achieved through gas contact analysis. The detected concentration signal is transmitted to the acquisition and analysis module 7 for processing. The processed concentration data is displayed intuitively through the display module 2. When the detected SF6 concentration exceeds the preset safety threshold, the alarm 35 on the outside of the outer casing 1 immediately issues an alarm, promptly reminding staff to investigate potential leaks and ensuring the normal operation of the equipment and the safety of personnel.

[0029] After the device has been used for a period of time, the SF6 monitoring sensor 11 may experience detection deviations due to long-term contact with external gases, impurity adhesion, or aging of its own components. At this time, the device can automatically start the calibration process without manual intervention, effectively solving the shortcomings of existing devices that cannot automatically calibrate and rely on cumbersome manual operation. During the calibration process, the stepper motor 14 rotates slowly and uniformly, and the large missing gear 15 fixed at its output end rotates synchronously. Since the large missing gear 15 is meshed with the small toothed ring 20 sleeved on the outside of the nut block 19, it drives the nut block 19 to rotate inside the support frame 13. The support frame 13 provides rotational support for the nut block 19. At the same time, the limiting rod 16 is slidably installed inside the support frame 13. One end of the limiting rod 16 is fixedly connected to the sealing column 9, and the other end is fixed to the threaded rod 17 through the connecting frame 18. It can limit and guide the threaded rod 17 and the sealing column 9 to prevent them from deviating during movement. The nut block 19 and the threaded rod 17 are connected by a through thread. When the nut block 19 rotates, the threaded rod 17 drives the sealing column 9 to slide slowly inside the sealing sleeve 6. The sliding sealing structure between the sealing sleeve 6 and the sealing column 9 can ensure that there is no gas leakage during the gas path switching process and improve the calibration accuracy.

[0030] When the sealing column 9 moves to the first preset position, the through hole 12 completely separates from the collecting pipe 8 and achieves a seal. At the same time, the through hole 12 is precisely aligned with the clean gas conduit 25. The clean gas in the clean gas tank 22 enters the measuring gas chamber 10 through the clean gas conduit 25 and the through hole 12, and comes into contact with the SF6 monitoring sensor 11, completing the zero-point calibration of the SF6 monitoring sensor 11 and effectively correcting the zero-point drift caused by long-term use. After the zero-point calibration is completed, the stepper motor 14 continues to rotate at a constant speed, driving the sealing column 9 to move further to the second preset position. At this time, the through hole 12 separates from the clean gas conduit 25 and is aligned with the SF6 standard gas conduit 27. The standard gas in the SF6 standard gas tank 26 enters the measuring gas chamber 10 through the SF6 standard gas conduit 27 and the through hole 12, and comes into contact with the SF6 monitoring sensor 11. The acquisition and analysis module 7 compares the detection value of the SF6 monitoring sensor 11 with the standard gas concentration to complete the range calibration and ensure the detection accuracy of the SF6 monitoring sensor 11.

[0031] After the range calibration is completed, the stepper motor 14 reverses the set number of revolutions, driving the large missing gear 15, small gear ring 20 and nut block 19 to rotate in the opposite direction. The threaded rod 17 drives the sealing column 9 to slide and reset in the opposite direction until the through hole 12 is aligned with the collection tube 8 again. The device returns to normal monitoring status. The entire automatic calibration process is completed automatically, which solves the defects of existing devices that rely on manual calibration, are cumbersome to operate and are not timely in calibration. It effectively corrects sensor drift, reduces detection distortion, false alarms or missed alarms, and meets the requirements of long-term stable monitoring.

[0032] Example 2: Please refer to Figure 7 - Figure 10 This embodiment further describes Example 1, and a reset shielding component is provided inside the measuring gas chamber 10.

[0033] The reset shielding assembly includes a sealing block 29, which slides and seals against the inner wall of the measuring gas chamber 10 near the through hole 12. Limiting push rods 30 are fixedly installed through both sides of the sealing block 29, and both ends of the limiting push rods 30 slide and seal through both ends of the sealing column 9.

[0034] A reset pressure plate 32 is fixedly installed at the end of the limit push rod 30 near the large missing gear 15, and a trigger pressure plate 31 is fixedly installed at the end of the limit push rod 30 away from the reset pressure plate 32.

[0035] A positioning rod 33 is fixedly installed on the side of the fixed frame 5 near the reset pressure plate 32. A contact plate 34 is fixedly installed on the end of the positioning rod 33 near the reset pressure plate 32. One side of the contact plate 34 is in contact with one side of the reset pressure plate 32.

[0036] In this embodiment, during the automatic calibration process of Embodiment 1, when the stepper motor 14 drives the sealing column 9 to move to the second preset position, precisely aligning the through hole 12 with the SF6 standard gas conduit 27, after calibration, the stepper motor 14 will rotate one revolution again, driving the sealing column 9 to continue moving a preset distance along the moving direction. During this process, the trigger pressure plate 31 fixed at one end of the limiting push rod 30 will first come into contact with and press against the inner wall of the sealing sleeve 6. Since the trigger pressure plate 31 and the sealing block 29 are fixedly connected by the limiting push rod 30, the pressing force of the inner wall of the sealing sleeve 6 on the trigger pressure plate 31 will be transmitted through the limiting push rod 30, pushing the sealing block 29 to slide and adhere on the inner wall of the measuring gas chamber 10 near the through hole 12, ultimately completely sealing and blocking the through hole 12. This design effectively isolates the measuring gas chamber 10 from the external gas path, ensuring that after calibration, no other gases such as clean gas or SF6 standard gas will re-enter the chamber. This prevents secondary contact between the calibrated chamber and various calibration gases, avoiding unnecessary additional consumption of calibration gases. It also prevents gas waste caused by calibration gas flowing back to the clean gas tank 22 or SF6 standard gas tank 26, ensuring that the gas in the tank is used only for the calibration process. This improves gas utilization, reduces consumable costs for long-term operation of the device, and avoids secondary contact with gases interfering with the internal environment of the chamber. This lays a pure foundation for normal testing after subsequent reset, eliminating the need for additional chamber purging steps, further simplifying the calibration process and improving the operating efficiency of the device.

[0037] After the range calibration is completed, the stepper motor 14 reverses the set number of revolutions, driving the large missing gear 15, small gear ring 20, and nut block 19 to rotate in the opposite direction. The threaded rod 17 then drives the sealing column 9 to initiate the reverse sliding reset process. During the reverse movement of the sealing column 9, after the through hole 12 is completely disengaged from the clean gas conduit 25, the sealing column 9 continues to move in the reverse direction. At this time, the limit push rod 30 approaches the reset pressure plate 32 fixed at one end of the reset pressure plate 32, and gradually moves towards the abutment plate 34 installed on the positioning rod 33 on the fixed frame 5, eventually making tight contact with one side of the abutment plate 34. Since the abutment plate 34 forms a fixed limit block on the reset pressure plate 32, the reset pressure plate 32 no longer moves with the sealing column 9, while the sealing column 9 continues to slide in the reverse direction, thereby driving the limit push rod 30 to generate a reverse displacement relative to the sealing column 9. This displacement will push the sealing block 29 to slide in the reverse direction synchronously, thereby releasing the seal on the through hole 12. The sealing column 9 continues to slide in the reverse direction to the initial position, the through hole 12 is precisely aligned with the collection tube 8 again, the reset shielding component completes all reset actions, and the device then returns to normal external gas collection and detection state, ensuring that the device quickly resumes normal detection.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An SF6 gas leak monitoring and alarm device, comprising a housing (1), a display module (2) fixed to the outside of one side of the housing (1), and a mounting bracket (3) fixed to the outside of the other side of the housing (1), characterized in that: A collection module (4) is fixed through the bottom end of the outer shell (1). A fixing frame (5) is fixedly installed inside the bottom end of the outer shell (1). A sealing sleeve (6) is fixed at one end of the fixing frame (5). A sealing column (9) is slidably and sealingly installed inside one end of the sealing sleeve (6). A data acquisition and analysis module (7) is fixed on one side of the fixing frame (5). A drive calibration component is configured on the outside of the sealing column (9) near the opening end of the sealing sleeve (6). A measuring gas chamber (10) is opened inside the sealing column (9). An SF6 monitoring sensor (11) is fixed on the inner wall of one side of the measuring gas chamber (10). A reset shielding component is provided inside the measuring gas chamber (10). An alarm (35) is fixed on the outside of the outer shell (1). The drive calibration assembly includes a stepper motor (14) and a threaded rod (17). The stepper motor (14) is fixedly installed on the outside of the mounting bracket (5), and the threaded rod (17) is fixedly installed on the outside of the sealing column (9). A through hole (12) is provided between the outside of the sealing column (9) and the inside of the measuring gas chamber (10). A collection tube (8) is fixedly connected to the inside of the sealing sleeve (6) near the through hole (12). The input end of the collection tube (8) is fixedly connected to the output end of the collection module (4). The fixed frame (5) has a support frame (13) fixedly installed on the side near the stepper motor (14). A nut block (19) is rotatably engaged on one side of the support frame (13). The nut block (19) and the threaded rod (17) are connected by a through thread. A large missing gear (15) is fixedly installed at the output end of the stepper motor (14). A small toothed ring (20) is fixedly fitted on the outside of the nut block (19). The small toothed ring (20) meshes with the large missing gear (15). A limit rod (16) is slidably installed inside the support frame (13) on the side away from the large missing gear (15). One end of the limit rod (16) is fixedly installed on the outside of the sealing column (9). A connecting frame (18) is fixedly connected between the limit rod (16) and the end of the threaded rod (17) away from the sealing column (9). The reset shielding assembly includes a sealing block (29), which slides and seals against the inner wall of the measuring gas chamber (10) near the through hole (12). Limiting push rods (30) are fixedly installed through both sides of the sealing block (29), and both ends of the limiting push rods (30) slide and seal through both ends of the sealing column (9). A reset pressure plate (32) is fixedly installed at the end of the limiting push rod (30) near the large missing gear (15), and a trigger pressure plate (31) is fixedly installed at the end of the limiting push rod (30) away from the reset pressure plate (32). A positioning rod (33) is fixedly installed on the side of the fixed frame (5) near the reset pressure plate (32). A contact plate (34) is fixedly installed on one end of the positioning rod (33) near the reset pressure plate (32). One side of the contact plate (34) is in contact with one side of the reset pressure plate (32).

2. The SF6 gas leak monitoring and alarm device according to claim 1, characterized in that: The sealing sleeve (6) has a clean gas conduit (25) fixedly connected inside the side near the collecting pipe (8). The clean gas conduit (25) is fixedly connected to a clean gas tank (22) at the end away from the sealing sleeve (6). The top of the clean gas tank (22) is fixedly connected to a first gas injection pipe (23).

3. The SF6 gas leak monitoring and alarm device according to claim 2, characterized in that: The sealing sleeve (6) is fixedly connected to the SF6 standard gas conduit (27) on the side near the clean gas conduit (25). The SF6 standard gas conduit (27) is fixedly connected to the SF6 standard gas cylinder (26) at the end away from the sealing sleeve (6). The top of the SF6 standard gas cylinder (26) is fixedly connected to the second gas injection pipe (28). One end of the first gas injection pipe (23) and the second gas injection pipe (28) are both fixed to the outside of the outer shell (1).

4. The SF6 gas leak monitoring and alarm device according to claim 3, characterized in that: The first gas injection pipe (23) and the second gas injection pipe (28) are both fixedly connected to a valve (24) at one end outside the outer shell (1). The clean gas tank (22) and the SF6 standard gas tank (26) are both fitted with a positioning frame (21), and one end of the positioning frame (21) is fixedly installed on the inner wall of the outer shell (1).

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