SF6 gas detection device

Abstract

The invention relates to the technical field of electrical equipment maintenance, and discloses an SF6 gas detection device which comprises a base, a gas inlet bin, a non-return bin and a gas exhaust assembly. An air inlet is formed in the side wall of an air inlet bin on the base, and an air detection sensor is arranged in the air inlet bin; the non-return bin is arranged above the air inlet bin, and a baffle capable of being opened and closed is arranged in the non-return bin. The exhaust assembly is arranged above the non-return bin; sF6 deposited on the ground enters the gas inlet bin through the gas inlet, the gas detection sensor carries out real-time monitoring, in the leakage state, the baffle is opened, the gas inlet bin communicates with the gas exhaust pipe through the check bin, and the SF6 is exhausted through the gas exhaust assembly; in the emptying state, the baffle is closed, and the non-return bin is closed; and residual SF6 gas in the exhaust pipe and an external pipeline is prevented from flowing back. According to the SF6 gas detection device provided by the invention, the problem of false alarm of the gas detection sensor caused by backflow of residual gas is solved.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment maintenance technology, specifically to an SF6 gas detection device. Background Technology

[0002] In the GIS room of a high-voltage substation, SF6 gas is used as an insulating and arc-extinguishing medium, and its leakage monitoring is crucial to ensuring the safe operation of the equipment.

[0003] Existing automatic SF6 detection devices typically consist of a detection chamber, an exhaust system, and an external exhaust duct. When an SF6 leak is detected, the system immediately activates the exhaust system to expel the SF6-containing air from the room to the outside through the external exhaust duct, thereby reducing the indoor SF6 concentration and triggering an alarm.

[0004] However, in actual operation, after the exhaust system stops running, a certain concentration of SF6 gas remains in the external exhaust duct. Due to pressure differences, temperature changes, or natural diffusion, this residual gas gradually flows back into the detection chamber. Because SF6 is denser than air, it easily accumulates at the bottom of the detection chamber, causing the gas detection sensor to detect an increased SF6 concentration again, triggering a secondary alarm signal. This false alarm caused by the backflow of residual gas not only interferes with operators' judgment of the actual leak situation but may also lead to unnecessary repeated exhaust operations, increasing equipment wear and operating costs, and seriously affecting the accuracy and reliability of the SF6 leak monitoring system. Summary of the Invention

[0005] This invention provides an SF6 gas detection device to solve the problem of false alarms in gas detection sensors caused by residual gas backflow.

[0006] This invention provides an SF6 gas detection device, comprising: a base, an inlet chamber, a check chamber, and an exhaust assembly; the inlet chamber is disposed on the base, and an air inlet is provided on the side wall of the inlet chamber, and a gas detection sensor is disposed inside the inlet chamber; the check chamber is disposed above the inlet chamber and communicates with the inlet chamber, and an openable baffle is disposed inside the check chamber; the exhaust assembly is disposed above the check chamber, and the exhaust pipe of the exhaust assembly communicates with the check chamber; wherein, in a leaking state, the baffle is open, and the check chamber communicates with the inlet chamber and the exhaust pipe; when the gas is purged, the baffle is closed, and the check chamber is sealed.

[0007] Beneficial Effects: A micro-fan maintains a slight negative pressure within the check chamber. SF6 deposited on the ground enters the chamber through the inlet. A gas detection sensor monitors the chamber in real time. When the sensor detects SF6, it transmits a signal to a remote terminal via an electrical connection to confirm a leak. The baffle opens, connecting the chamber and exhaust pipe through the check chamber, allowing SF6 to escape through the exhaust assembly. After evacuation, the baffle reverses and closes, sealing the check chamber and preventing backflow of residual SF6 from the exhaust pipe and external piping. Simultaneously, the micro-fan continues to operate at a low flow rate, allowing the gas detection sensor to continuously re-measure the indoor gas. If the concentration has decreased, normal monitoring resumes; if it still exceeds the limit, the baffle reopens for further emission. This invention solves the problem of false alarms caused by residual gas backflow in the SF6 gas detection sensor.

[0008] In one optional embodiment, the check chamber is provided with a sealing hopper inside, the opening at the top of the sealing hopper is connected to the air outlet of the check chamber, and the baffle is rotatably disposed at the opening at the bottom of the sealing hopper by a rotary drive mechanism.

[0009] Beneficial effects: When leaking, the rotary drive mechanism drives the baffle to rotate downwards, opening the channel at the bottom of the sealing hopper and connecting the air intake chamber and the exhaust pipe. When the leak is cleared, the rotary drive mechanism drives the baffle to reverse and reset, so that the baffle and the sealing hopper fit tightly again, cutting off the channel for residual gas to flow back into the exhaust pipe and external pipeline.

[0010] In one optional embodiment, the rotary drive mechanism includes: a first drive device disposed on the check chamber; a screw disposed on the drive end of the first drive device, a slider disposed on the screw, the slider being threadedly connected to the screw; a transmission assembly disposed on the slider, the transmission assembly including a first connecting block and a second connecting block, the first connecting block being hingedly connected to the slider, the second connecting block being connected to the first connecting block via a telescopic slide rod; a rotating shaft disposed on the second connecting block, and a baffle disposed on the rotating shaft.

[0011] Beneficial effects: The first driving device drives the screw to rotate, and the first connecting block limits the slider, so that the rotational motion is converted into linear motion, causing the slider to translate along the screw. At the same time, the first connecting block rotates relative to the slider, and drives the second connecting block, the rotating shaft and the baffle to rotate through the telescopic slide rod, so as to realize the opening and closing of the baffle.

[0012] In one optional embodiment, the air intake chamber includes: an outer shell disposed on the base, an air inlet disposed on the outer shell, and an air inlet pipe disposed at the air inlet; a filter cover disposed inside the outer shell via a support base, the filter cover being configured as a barrel-shaped structure, the gap between the filter cover and the outer shell forming an annular air inlet groove, the annular air inlet groove communicating with the air inlet; and a mounting cover disposed above the filter cover, the gas detection sensor being disposed inside the mounting cover.

[0013] Beneficial effects: Gas is drawn in through the air inlet pipe and air inlet, passes through the annular air inlet groove and enters the filter cover to achieve dust-gas separation, and then enters the installation cover, where it is monitored in real time by the gas detection sensor.

[0014] In one alternative embodiment, the filter cover is provided with a cleaning assembly for cleaning the outer wall of the filter cover.

[0015] Beneficial effects: The cleaning component cleans the surface of the filter cover, and the detached dust slides down the outer wall of the filter cover and is collected in the hollow base cavity.

[0016] In one optional embodiment, the cleaning assembly includes: a rotating frame rotatably disposed on the filter cover, the rotating frame having slots for airflow; an impeller disposed on the rotating frame; and multiple connecting rods disposed circumferentially on the rotating frame, the connecting rods having brushes that contact the filter cover.

[0017] Beneficial effects: The gas filtered by the filter cover pushes the impeller upward to rotate, which in turn drives the rotating frame and connecting rod to rotate, so that the brush on the connecting rod continuously cleans the outer wall of the filter cover.

[0018] In one optional embodiment, the exhaust assembly includes: an exhaust pipe disposed on the check chamber for connecting to an external pipeline; a second drive device disposed inside the exhaust pipe; and an exhaust wheel disposed at the drive end of the second drive device.

[0019] Beneficial effects: When there is a leak, the second drive device drives the exhaust fan wheel to rotate, quickly discharging the gas to the outside through the exhaust pipe. When the gas is completely discharged, the second drive device stops rotating.

[0020] In one alternative embodiment, the end of the exhaust pipe is provided with a neutralization component for neutralizing the airflow.

[0021] Beneficial effects: Before entering the external pipeline, the gas in the exhaust pipe is introduced into the neutralization component, where it is quickly neutralized by the neutralizing alkaline solution.

[0022] In one optional embodiment, the neutralization component includes: a top seat disposed at the top of the exhaust pipe; a water tank disposed inside the top seat, wherein an annular gap exists between the outer wall of the water tank and the inner wall of the top seat, and the outer wall of the water tank is provided with a plurality of air inlets along the circumferential direction, and the top of the water tank is open; and a spray chamber disposed above the opening of the water tank, wherein the spray chamber is provided with a nozzle for spraying neutralizing alkaline solution, and the top of the spray chamber is provided with an air outlet for connecting to an external pipeline.

[0023] Beneficial effects: After the gas enters the top seat, it flows upward along the annular gap between the inner wall of the top seat and the outer wall of the water tank. It enters the water tank through the air inlet on the outer wall of the water tank and enters the spray chamber from the opening at the top of the water tank. The nozzles in the spray chamber spray the neutralizing alkali solution downward. The gas and the neutralizing alkali solution come into contact in opposite directions, completing the rapid neutralization. The neutralized alkali solution can be collected through the water tank, avoiding damage to the exhaust pipe.

[0024] In one alternative embodiment, a diversion plate is provided at the opening at the top of the water tank, and the diversion plate is provided with a plurality of micropores.

[0025] Beneficial effects: As the gas passes through the micropores on the distributor plate, it can form a fine bubble flow, which can make the neutralization efficiency higher and more complete.

[0026] In one alternative embodiment, a foam-breaking screen is provided on the top of the spray chamber.

[0027] Beneficial effects: The foam defoaming net can intercept droplets and cause them to flow back to the diverter plate, forming a closed liquid curtain.

[0028] In one optional embodiment, a circulation pipeline is provided at the lower part of the water tank, and a water pump is provided on the circulation pipeline, which is connected to the nozzle.

[0029] Beneficial effects: The water pump transports the neutralized alkali solution in the water tank to the nozzle through the circulation pipeline, which enables the recycling of the neutralized alkali solution and reduces operating costs. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a front view of an SF6 gas detection device according to an embodiment of the present invention; Figure 2 for Figure 1 A cross-sectional schematic diagram; Figure 3 for Figure 1 Rear view diagram; Figure 4 for Figure 1 A left-view diagram; Figure 5 for Figure 1 A top-down view; Figure 6 for Figure 1 A schematic diagram of the rotary drive mechanism; Figure 7 for Figure 1 Exploded view of the cleaning assembly; Figure 8 for Figure 7 A schematic diagram of the cleaning component; Figure 9 for Figure 7 A schematic diagram of a medium-sized brush.

[0032] Explanation of reference numerals in the attached figures: 1. Base; 2. Air inlet chamber; 21. Outer shell; 22. Air inlet pipe; 23. Filter cover; 24. Air inlet slot; 25. Mounting cover; 26. Gas detection sensor; 27. Rotating frame; 28. Impeller; 29. ​​Connecting rod; 210. Brush; 211. Support base; 3. Check chamber; 31. Baffle; 32. Sealing hopper; 4. Rotary drive mechanism; 41. First drive device; 42. Screw; 43. Slider; 44. First connecting block; 45. Second connecting block; 46. Telescopic slide rod; 47. Rotating shaft; 5. Exhaust assembly; 51. Exhaust pipe; 52. Second drive device; 53. Exhaust fan wheel; 6. Neutralization assembly; 61. Top seat; 62. Water tank; 63. Air inlet; 64. Diverter plate; 65. Nozzle; 66. Circulation pipeline; 67. Water pump; 68. Defoaming screen; 69. Air outlet; 7. Miniature fan. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0034] The following is combined Figures 1 to 9 The following describes embodiments of the present invention.

[0035] According to an embodiment of the present invention, in one aspect, an SF6 gas detection device is provided to solve the problem of false alarms in the gas detection sensor 26 caused by residual gas backflow.

[0036] This invention provides an SF6 gas detection device, comprising: a base 1, an inlet chamber 2, a check chamber 3, and an exhaust assembly 5; the inlet chamber 2 is disposed on the base 1, and an air inlet is provided on the side wall of the inlet chamber 2, and a gas detection sensor 26 is disposed inside the inlet chamber 2; the check chamber 3 is disposed above the inlet chamber 2, and the check chamber 3 is connected to the inlet chamber 2, and an openable baffle 31 is disposed inside the check chamber 3; the exhaust assembly 5 is disposed above the check chamber 3, and the exhaust pipe 51 of the exhaust assembly 5 is connected to the check chamber 3; wherein, in the leakage state, the baffle 31 is opened, and the check chamber 3 connects the inlet chamber 2 and the exhaust pipe 51; when the gas is purged, the baffle 31 is closed, and the check chamber 3 is sealed.

[0037] A micro fan 7 maintains a slight negative pressure within the check chamber 3. SF6 deposited on the ground enters the intake chamber 2 through the air inlet. The gas detection sensor 26 monitors the intake chamber 2 in real time. When the gas detection sensor 26 detects SF6, it transmits the signal to a remote terminal via an electrical connection to confirm a leak. The baffle 31 opens, connecting the intake chamber 2 and the exhaust pipe 51 through the check chamber 3, allowing SF6 to be discharged through the exhaust assembly 5. When the sludge is exhausted, the baffle 31 reverses and closes, sealing the check chamber 3 and preventing the intake chamber 2 and exhaust pipe 51 from connecting, thus preventing the backflow of residual SF6 gas from the exhaust pipe 51 and the external pipeline. Simultaneously, the micro fan 7 continues to operate at a low flow rate, allowing the gas detection sensor 26 to continuously retest the indoor gas. If the concentration has decreased, normal monitoring resumes; if it still exceeds the standard, the baffle 31 is reopened for emission. The SF6 gas detection device provided in this embodiment solves the problem of false alarms caused by residual gas backflow in the gas detection sensor 26.

[0038] It should be noted that the miniature fan 7 can be installed inside the check chamber 3.

[0039] In one embodiment, a sealing hopper 32 is provided inside the check chamber 3. The opening at the top of the sealing hopper 32 communicates with the outlet end of the check chamber 3. The baffle 31 is rotatably disposed at the opening at the bottom of the sealing hopper 32 via a rotary drive mechanism 4. In the event of a leak, the rotary drive mechanism 4 drives the baffle 31 to rotate downward, opening the channel at the bottom of the sealing hopper 32 and connecting the intake chamber 2 and the exhaust pipe 51. In the event of a complete leak, the rotary drive mechanism 4 drives the baffle 31 to reverse and reset, causing the baffle 31 to re-close tightly with the sealing hopper 32, cutting off the channel for the return of residual gas from the exhaust pipe 51 and the external pipeline. Alternatively, as an alternative embodiment, the baffle 31 can also be slidably disposed at the opening at the bottom of the sealing hopper 32 via a translation drive mechanism.

[0040] In one embodiment, a first driving device 41 is disposed on the check chamber 3; a screw 42 is disposed on the driving end of the first driving device 41, and a slider 43 is disposed on the screw 42, the slider 43 being threadedly connected to the screw 42; a transmission assembly is disposed on the slider 43, the transmission assembly including a first connecting block 44 and a second connecting block 45, the first connecting block 44 being hingedly connected to the slider 43, and the second connecting block 45 being connected to the first connecting block 44 via a telescopic slide rod 46; a rotating shaft 47 is disposed on the second connecting block 45, and a baffle 31 is disposed on the rotating shaft 47. The first driving device 41 drives the screw 42 to rotate, and the first connecting block 44 limits the slider 43, converting the rotational motion into linear motion, causing the slider 43 to translate along the screw 42. Simultaneously, the first connecting block 44 rotates relative to the slider 43, driving the second connecting block 45, the rotating shaft 47, and the baffle 31 to rotate via the telescopic slide rod 46, thereby realizing the opening and closing of the baffle 31. Alternatively, as an alternative implementation, the rotary drive mechanism 4 can also be configured as a gear transmission structure.

[0041] Specifically, the telescopic slide bar 46 has two parallel ones.

[0042] In one embodiment, the air intake chamber 2 includes: a housing 21 disposed on the base 1, an air inlet disposed on the housing 21, and an air inlet pipe 22 disposed at the air inlet; a filter cover 23 disposed within the housing 21 via a support base 211, the filter cover 23 having a barrel-shaped structure, the gap between the filter cover 23 and the housing 21 forming an annular air inlet groove 24, the annular air inlet groove 24 communicating with the air inlet; and a mounting cover 25 disposed above the filter cover 23, with a gas detection sensor 26 disposed within the mounting cover 25. Gas is drawn in through the air inlet pipe 22 and the air inlet, passes through the annular air inlet groove 24 into the filter cover 23 for dust-gas separation, and then enters the mounting cover 25, where real-time monitoring is performed by the gas detection sensor 26. Alternatively, as an alternative embodiment, the filter cover 23 can also be replaced with a square filter module disposed at the air inlet.

[0043] Specifically, the air inlet pipe 22 is configured as a flexible corrugated rubber pipe.

[0044] Specifically, the filter cover 23 is slidably supported by the support base 211.

[0045] In one embodiment, a cleaning assembly is provided on the filter cover 23 for cleaning the outer wall of the filter cover 23. By cleaning the surface of the filter cover 23 with the cleaning assembly, the detached dust slides down the outer wall of the filter cover 23 and is collected in the hollow cavity of the base 1. Alternatively, as an alternative embodiment, the cleaning assembly can be omitted, and cleaning can be performed by manually removing the filter cover 23.

[0046] In one embodiment, the cleaning assembly includes: a rotating frame 27 rotatably mounted on the filter cover 23, the rotating frame 27 having slots for airflow; an impeller 28 mounted on the rotating frame 27; and multiple connecting rods 29 circumferentially mounted on the rotating frame 27, each connecting rod 29 having a brush 210 that contacts the filter cover 23. The gas filtered by the filter cover 23 pushes the impeller 28 upwards, thereby rotating the rotating frame 27 and the connecting rods 29, causing the brushes 210 on the connecting rods 29 to continuously clean the outer wall of the filter cover 23. Alternatively, as an alternative embodiment, the impeller 28 can be omitted, and a motor for driving its rotation can be mounted on the rotating frame 27.

[0047] Specifically, the brush 210 is fixed to the connecting rod 29 by a U-shaped elastic metal sheet.

[0048] In one embodiment, the exhaust assembly 5 includes: an exhaust pipe 51 disposed on the check chamber 3, the exhaust pipe 51 being used to connect to an external pipeline; a second drive device 52 disposed inside the exhaust pipe 51; and an exhaust fan 53 disposed at the drive end of the second drive device 52. In a leaking state, the second drive device 52 drives the exhaust fan 53 to rotate, rapidly discharging the gas to the outside through the exhaust pipe. When the gas is completely discharged, the second drive device 52 stops rotating.

[0049] In one embodiment, a neutralization component 6 is provided at the end of the exhaust pipe 51, which is used to neutralize the gas flow. Before entering the external pipeline, the gas in the exhaust pipe 51 is introduced into the neutralization component 6, where it is rapidly neutralized by a neutralizing alkaline solution. Alternatively, as an alternative embodiment, the neutralization component 6 can be omitted, and the gas, after being discharged from the exhaust pipe 51, enters a dedicated gas treatment unit for further processing.

[0050] In one embodiment, the neutralization component 6 includes: a top seat 61 disposed at the top of the exhaust pipe 51; a water tank 62 disposed inside the top seat 61, with an annular gap between the outer wall of the water tank 62 and the inner wall of the top seat 61, and a plurality of air inlets 63 disposed circumferentially on the outer wall of the water tank 62, and an opening at the top of the water tank 62; and a spray chamber disposed above the opening of the water tank 62, with a spray nozzle 65 disposed inside the spray chamber for spraying neutralizing alkaline solution, and an air outlet 69 disposed at the top of the spray chamber for connecting to an external pipeline. After the gas enters the top seat 61, it flows upward along the annular gap between the inner wall of the top seat 61 and the outer wall of the water tank 62. It enters the water tank 62 through the air inlet 63 on the outer wall of the water tank 62, and then enters the spray chamber from the opening at the top of the water tank 62. The nozzles 65 in the spray chamber spray the neutralizing alkali solution downward. The gas and the neutralizing alkali solution come into countercurrent contact, completing rapid neutralization. The neutralized alkali solution can be collected through the water tank 62 to avoid damage to the exhaust pipe.

[0051] In one embodiment, a diversion plate 64 with multiple micropores is provided at the opening at the top of the water tank 62. Gas passing through the micropores on the diversion plate 64 forms a fine bubble flow, resulting in higher and more thorough neutralization efficiency. Alternatively, as an alternative embodiment, the diversion plate 64 can be omitted, and the gas directly enters the spray chamber upwards through the opening at the top of the water tank 62.

[0052] In one embodiment, a defoaming screen 68 is provided on the top of the spray chamber. The defoaming screen 68 can intercept droplets and cause them to flow back to the diversion plate 64, forming a closed liquid curtain.

[0053] In one embodiment, a circulation pipe 66 is provided at the lower part of the water tank 62, and a water pump 67 is provided on the circulation pipe 66. The circulation pipe 66 is connected to the nozzle 65. The water pump 67 transports the neutralized alkali solution in the water tank 62 to the nozzle 65 through the circulation pipe 66, which enables the recycling of the neutralized alkali solution and reduces operating costs.

[0054] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An SF6 gas detection device, characterized in that, include: Base (1); An air intake chamber (2) is provided on the base (1). An air inlet is provided on the side wall of the air intake chamber (2). A gas detection sensor (26) is provided inside the air intake chamber (2). Check chamber (3) is located above air intake chamber (2). The check chamber (3) is connected to air intake chamber (2). An openable baffle (31) is provided inside the check chamber (3). An exhaust assembly (5) is disposed above the check chamber (3), and the exhaust pipe (51) of the exhaust assembly (5) is connected to the check chamber (3); In the leakage state, the baffle (31) is open, and the check chamber (3) is connected to the air inlet chamber (2) and the exhaust pipe (51). When the air is drained, the baffle (31) is closed, and the check chamber (3) is sealed.

2. The SF6 gas detection device according to claim 1, characterized in that, The check chamber (3) is provided with a sealing hopper (32) inside. The opening at the top of the sealing hopper (32) is connected to the air outlet of the check chamber (3). The baffle (31) is rotatably disposed at the opening at the bottom of the sealing hopper (32) by a rotary drive mechanism (4).

3. The SF6 gas detection device according to claim 2, characterized in that, The rotary drive mechanism (4) includes: The first drive unit (41) is installed on the check chamber (3); A screw (42) is provided at the driving end of the first driving device (41), and a slider (43) is provided on the screw (42), and the slider (43) is threadedly connected to the screw (42); A transmission assembly is disposed on the slider (43). The transmission assembly includes a first connecting block (44) and a second connecting block (45). The first connecting block (44) is hinged to the slider (43), and the second connecting block (45) is connected to the first connecting block (44) through a telescopic slide rod (46). A rotating shaft (47) is disposed on the second connecting block (45), and a baffle (31) is disposed on the rotating shaft (47).

4. The SF6 gas detection device according to claim 1, characterized in that, The air intake chamber (2) includes: The outer shell (21) is disposed on the base (1), the air inlet is disposed on the outer shell (21), and an air inlet pipe (22) is disposed at the air inlet. A filter cover (23) is installed inside the outer shell (21) via a support base (211). The filter cover (23) is configured as a barrel-shaped structure. The gap between the filter cover (23) and the outer shell (21) forms an annular air inlet groove (24), which is connected to the air inlet. Mounting cover (25) is disposed above the filter cover (23), and the gas detection sensor (26) is disposed inside the mounting cover (25).

5. The SF6 gas detection device according to claim 4, characterized in that, A cleaning assembly is provided on the filter cover (23), the cleaning assembly being used to clean the outer wall of the filter cover (23), the cleaning assembly comprising: A rotating frame (27) is rotatably mounted on the filter cover (23), and the rotating frame (27) is provided with slots for airflow. An impeller (28) is mounted on the rotating frame (27); Multiple connecting rods (29) are arranged circumferentially on the rotating frame (27), and brushes (210) that contact the filter cover (23) are arranged on the connecting rods (29).

6. The SF6 gas detection device according to any one of claims 1 to 5, characterized in that, The exhaust assembly (5) includes: An exhaust pipe (51) is provided on the check chamber (3), and the exhaust pipe (51) is used to connect to an external pipeline; The second drive unit (52) is disposed inside the exhaust pipe (51); The exhaust fan (53) is located at the drive end of the second drive device (52).

7. The SF6 gas detection device according to claim 6, characterized in that, The end of the exhaust pipe (51) is provided with a neutralization component (6), which is used to neutralize the airflow. The neutralization component (6) includes: A top seat (61) is provided at the top of the exhaust pipe (51); A water tank (62) is disposed inside the top seat (61). There is an annular gap between the outer wall of the water tank (62) and the inner wall of the top seat (61). The outer wall of the water tank (62) is provided with a plurality of air inlets (63) along the circumferential direction. The top of the water tank (62) is open. A spray chamber is located above the opening of the water tank (62). The spray chamber is equipped with a nozzle (65) for spraying neutralizing alkali solution. The top of the spray chamber is equipped with an air outlet (69) for connecting to an external pipeline.

8. The SF6 gas detection device according to claim 7, characterized in that, A diversion plate (64) is provided at the opening at the top of the water tank (62), and the diversion plate (64) is provided with multiple micropores.

9. The SF6 gas detection device according to claim 7, characterized in that, The top of the spray chamber is equipped with a foam defoaming net (68).

10. The SF6 gas detection device according to claim 7, characterized in that, A circulation pipe (66) is provided at the lower part of the water tank (62), and a water pump (67) is provided on the circulation pipe (66). The circulation pipe (66) is connected to the nozzle (65).

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