A GIS pipeline SF6 gas decomposition component detection system and method

Abstract

The application discloses a GIS pipeline SF6 gas decomposition component detection system and method, which comprises a pipeline body, a rectangular opening is arranged through the outer surface of the pipeline body, a sampling box is slidably arranged on the inner wall of the rectangular opening, a sampling hole is arranged through the bottom wall of the sampling box, a piston block is slidably arranged on the inner wall of the sampling box, a gas cylinder is fixedly arranged on the top end of the sampling box, the telescopic end of the gas cylinder is arranged through the top end of the sampling box and is fixedly arranged with the upper surface of the piston block, and a through hole is arranged through the upper surface of the piston block. When detection is not needed, the sampling box is moved out of the pipeline body, so that the smoothness of the gas flow in the pipeline body is ensured; the sampling hole is blocked by the baffle, the SF6 gas in the pipeline body is prevented from mixing with the extracted SF6 gas in the sampling box, the concentration of the sampled SF6 gas is prevented from being affected, and the detection accuracy is affected.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, and in particular to a system and method for detecting SF6 gas decomposition components in GIS pipelines. Background Technology

[0002] Sulfur hexafluoride (SF6) gas, as a high-performance insulating and arc-quenching medium, is widely used in electrical insulation equipment such as gas-insulated switchgear (GIS), gas-insulated transformers (GIT), and gas-insulated lines (GIL). However, when partial discharge or localized overheating occurs inside the equipment due to insulation faults, SF6 gas molecules decompose under high voltage or high temperature conditions, generating numerous highly chemically active, corrosive, and toxic decomposition products. These products seriously threaten the safe operation of electrical equipment and the health of maintenance personnel. Therefore, the identification and concentration determination of SF6 gas decomposition products are of significant practical importance and have long-term socio-economic benefits for preventing and diagnosing internal equipment faults, maintaining normal equipment operation, and ensuring safe production on site.

[0003] In existing SF6 gas decomposition component detection systems for GIS pipelines, the gas detection sensor is usually fixed inside the GIS pipeline during the detection process. This causes the gas detection sensor to occupy the space inside the pipeline, which can easily obstruct the flow of gas. Furthermore, the flowing gas can easily affect the accuracy of the detection data during the detection process. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a system and method for detecting SF6 gas decomposition components in GIS pipelines.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A system and method for detecting SF6 gas decomposition components in a GIS pipeline includes a pipeline body. A rectangular opening is formed through the outer surface of the pipeline body. A sampling box is slidably installed on the inner wall of the rectangular opening. A sampling hole is formed through the bottom wall of the sampling box. A piston block is slidably installed on the inner wall of the sampling box. A cylinder is fixedly installed at the top of the sampling box. The telescopic end of the cylinder passes through the top of the sampling box and is fixedly installed on the upper surface of the piston block. A through hole is formed through the upper surface of the piston block. A gas detection sensor is fixedly installed on the inner wall of the through hole. A lifting mechanism for raising and lowering the sampling box is provided on the outer surface of the pipeline body near the rectangular opening. A sealing mechanism is provided inside the sampling box.

[0007] As a further embodiment of the present invention, the lifting mechanism includes a C-shaped plate fixedly installed on the outer surface of the pipe body. A rectangular groove matching the cylinder is opened through the upper surface of the C-shaped plate. Two fixing blocks are symmetrically fixedly installed on the outer surfaces of opposite sides of the sampling box. A motor is fixedly installed on the upper surface of the C-shaped plate. The output end of the motor passes through the upper surface of the C-shaped plate and is fixedly installed with a screw. The bottom end of the screw is rotatably installed with the outer surface of the sampling box. The screw passes through the outer surface of one of the fixing blocks and is threadedly connected to it. A limiting component is provided between the C-shaped plate and the sampling box.

[0008] As a further embodiment of the present invention, the limiting component includes a guide rod fixedly installed between the C-shaped plate and the sampling box, the guide rod passing through the outer surface of a fixed block away from the screw and slidably installed therewith.

[0009] As a further embodiment of the present invention, the sealing mechanism includes a movable plate slidably installed on the inner wall of the sampling box, a baffle plate is fixedly installed on the lower surface of the movable plate, the baffle plate is slidably installed with the bottom wall of the sampling box, and a support mechanism is provided on the inner wall of the sampling box.

[0010] As a further embodiment of the present invention, the support mechanism includes multiple fixed tubes uniformly fixedly installed on the inner wall of the sampling box, a movable rod is inserted inside the multiple fixed tubes, one end of the movable rod away from the fixed tube is fixedly installed on the outer surface of the movable plate, a retaining ring is fixedly installed on the other end of the movable rod, and a limit ring is fixedly installed on the inner wall of the end of the fixed tube close to the movable plate.

[0011] As a further embodiment of the present invention, a compression spring is fixedly installed between the movable plate and the inner wall of the sampling box.

[0012] As a further embodiment of the present invention, a guide plate is fixedly installed on the upper surface of the movable plate, the guide plate is inclined to the side away from the piston block, and an L-shaped limiting plate is fixedly installed on the upper surface of the guide plate.

[0013] As a further embodiment of the present invention, a rubber sealing ring is fixedly installed on the outer surface of the pipe body near the rectangular opening.

[0014] As a further aspect of the present invention, its usage method includes the following steps:

[0015] 1. When detecting the decomposition components of SF6 gas inside the pipeline body, the screw drives the sampling box to penetrate deep into the pipeline body;

[0016] 2. The cylinder drives the piston block to rise, extracting part of the SF6 gas in the pipeline body into the sampling box.

[0017] 3. When the piston block rises to the top of the sampling box, the baffle blocks the sampling hole to prevent gas from entering the pipeline body;

[0018] IV. The decomposition components of SF6 gas are detected by a gas detection sensor installed on the piston block.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. The motor drives the screw to rotate, which in turn moves the sampling box, which is threadedly connected to the fixed block, into the interior of the pipeline body. This moves the sampling hole on the sampling box to the center of the pipeline body, facilitating the sampling of SF6 gas at the center of the pipeline body and improving the consistency of the sample. When testing is not required, the sampling box can be moved out of the pipeline body to ensure the smooth flow of gas inside the pipeline body.

[0021] 2. The piston block is driven upward by the cylinder, which draws the SF6 gas from the center of the pipeline into the sampling box. When the piston block rises to the guide plate, the moving plate will move the baffle fixed on its lower surface towards the sampling hole under the elastic force of the compression spring. The baffle will gradually block the sampling hole to prevent the SF6 gas in the pipeline from mixing with the SF6 gas extracted from the sampling box, thus avoiding affecting the concentration of the sampled SF6 gas and the accuracy of the detection.

[0022] 3. After the test is completed, the cylinder will push the piston block downward, so that the piston block will discharge the SF6 gas extracted from the sampling box into the pipeline body, thus avoiding the waste of gas. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a GIS pipeline SF6 gas decomposition component detection system and method proposed in this invention;

[0024] Figure 2 This is a cross-sectional structural schematic diagram of a GIS pipeline SF6 gas decomposition component detection system and method proposed in this invention;

[0025] Figure 3 This is a schematic diagram of the fixed pipe cross-sectional structure of the SF6 gas decomposition component detection system and method in GIS pipeline proposed in this invention;

[0026] Figure 4 for Figure 2 Enlarged view of the structure at point A in the middle;

[0027] Figure 5 This is a side view of the SF6 gas decomposition component detection system and method in a GIS pipeline proposed in this invention.

[0028] In the diagram: 1. Pipe body; 2. Rectangular opening; 3. Sampling box; 4. Piston block; 5. Cylinder; 6. C-shaped plate; 7. Fixing block; 8. Screw; 9. Motor; 10. Guide rod; 11. Gas detection sensor; 12. Fixing pipe; 13. Moving rod; 14. Moving plate; 15. Sampling hole; 16. Guide plate; 17. L-shaped limiting plate; 18. Baffle; 19. Compression spring; 20. Retaining ring; 21. Limiting ring; 22. Rectangular groove; 23. Rubber sealing ring. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] Example 1

[0032] Reference Figure 1-4 A system and method for detecting SF6 gas decomposition components in a GIS pipeline includes a pipeline body 1. A rectangular opening 2 is formed through the outer surface of the pipeline body 1. A sampling box 3 is slidably installed on the inner wall of the rectangular opening 2. A sampling hole 15 is formed through the bottom wall of the sampling box 3. A piston block 4 is slidably installed on the inner wall of the sampling box 3. A cylinder 5 is fixedly installed at the top of the sampling box 3. The telescopic end of the cylinder 5 passes through the top of the sampling box 3 and is fixedly installed on the upper surface of the piston block 4. A through hole is formed through the upper surface of the piston block 4. A gas detection sensor 11 is fixedly installed on the inner wall of the through hole. A lifting mechanism for lifting the sampling box 3 is provided on the outer surface of the pipeline body 1 near the rectangular opening 2. A sealing mechanism is provided inside the sampling box 3.

[0033] In this embodiment, the lifting mechanism includes a C-shaped plate 6 fixedly installed on the outer surface of the pipe body 1. A rectangular groove 22 matching the cylinder 5 is opened through the upper surface of the C-shaped plate 6. Two fixing blocks 7 are symmetrically fixedly installed on the outer surfaces of opposite sides of the sampling box 3. A motor 9 is fixedly installed on the upper surface of the C-shaped plate 6. The output end of the motor 9 passes through the upper surface of the C-shaped plate 6 and is fixedly installed with a screw 8. The bottom end of the screw 8 is rotatably installed with the outer surface of the sampling box 3. The screw 8 passes through the outer surface of one of the fixing blocks 7 and is threadedly connected to it. A limiting component is provided between the C-shaped plate 6 and the sampling box 3.

[0034] In this embodiment, the limiting component includes a guide rod 10 fixedly installed between the C-shaped plate 6 and the sampling box 3. The guide rod 10 passes through the outer surface of a fixing block 7 away from the screw 8 and is slidably installed therewith.

[0035] In this embodiment, the sealing mechanism includes a movable plate 14 that is slidably installed on the inner wall of the sampling box 3. A baffle 18 is fixedly installed on the lower surface of the movable plate 14. The baffle 18 is slidably installed on the bottom wall of the sampling box 3. The inner wall of the sampling box 3 is provided with a support mechanism.

[0036] In this embodiment, the support mechanism includes multiple fixed tubes 12 that are uniformly fixedly installed on the inner wall of the sampling box 3. A movable rod 13 is inserted inside the multiple fixed tubes 12. One end of the movable rod 13 away from the fixed tube 12 is fixedly installed on the outer surface of the movable plate 14. A retaining ring 20 is fixedly installed on the other end of the movable rod 13. A limit ring 21 is fixedly installed on the inner wall of the end of the fixed tube 12 close to the movable plate 14.

[0037] In this embodiment, a compression spring 19 is fixedly installed between the moving plate 14 and the inner wall of the sampling box 3.

[0038] In this embodiment, a guide plate 16 is fixedly installed on the upper surface of the movable plate 14. The guide plate 16 is inclined to the side away from the piston block 4, and an L-shaped limiting plate 17 is fixedly installed on the upper surface of the guide plate 16.

[0039] In this embodiment, its usage method includes the following steps:

[0040] 1. When detecting the SF6 gas decomposition components inside the pipeline body 1, the screw 8 drives the sampling box 3 to penetrate into the interior of the pipeline body 1.

[0041] 2. Cylinder 5 drives piston block 4 to rise, extracting part of the SF6 gas in pipeline body 1 into sampling box 3.

[0042] 3. When the piston block 4 rises to the top of the sampling box 3, the baffle 18 blocks the sampling hole 15 to prevent gas from entering the pipeline body 1.

[0043] Fourth, the decomposition components of SF6 gas are detected by the gas detection sensor 11 installed on the piston block 4.

[0044] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: When detecting the SF6 gas decomposition components inside the pipe body 1, the motor 9 is started, causing the motor 9 to drive the screw 8 to rotate, causing the screw 8 to drive the sampling box 3, which is threadedly connected to it through the fixing block 7, to move into the interior of the pipe body 1, so as to move the sampling hole 15 opened on the sampling box 3 to the center position of the pipe body 1, thereby facilitating the sampling of SF6 gas at the center of the pipe body 1 and improving the consistency of the sample taken; after the sampling box 3 is inserted into the pipe body 1, the cylinder 5 is started, causing the cylinder 5 to drive the piston block 4 to move upward, causing the piston block 4 to push the pipe body 1 into the center position of the pipe body 1. SF6 gas at the center of the pipeline body 1 is drawn into the sampling box 3. When the piston block 4 rises to the guide plate 16, the moving plate 14 will move the baffle 18 fixedly installed on its lower surface towards the sampling hole 15 under the elastic force of the compression spring 19. This causes the baffle 18 to gradually block the sampling hole 15, preventing the SF6 gas in the pipeline body 1 from mixing with the SF6 gas extracted from the sampling box 3, thus avoiding affecting the concentration of the sampled SF6 gas and the accuracy of the detection. After the detection is completed, the cylinder 5 will push the piston block 4 downward, causing the piston block 4 to discharge the SF6 gas extracted from the sampling box 3 into the pipeline body 1, thus avoiding the waste of gas.

[0045] Example 2

[0046] Reference Figure 5 A system and method for detecting SF6 gas decomposition components in a GIS pipeline includes a pipeline body 1. A rectangular opening 2 is formed through the outer surface of the pipeline body 1. A sampling box 3 is slidably installed on the inner wall of the rectangular opening 2. A sampling hole 15 is formed through the bottom wall of the sampling box 3. A piston block 4 is slidably installed on the inner wall of the sampling box 3. A cylinder 5 is fixedly installed at the top of the sampling box 3. The telescopic end of the cylinder 5 passes through the top of the sampling box 3 and is fixedly installed on the upper surface of the piston block 4. A through hole is formed through the upper surface of the piston block 4. A gas detection sensor 11 is fixedly installed on the inner wall of the through hole. A lifting mechanism for lifting the sampling box 3 is provided on the outer surface of the pipeline body 1 near the rectangular opening 2. A sealing mechanism is provided inside the sampling box 3.

[0047] In this embodiment, the lifting mechanism includes a C-shaped plate 6 fixedly installed on the outer surface of the pipe body 1. A rectangular groove 22 matching the cylinder 5 is opened through the upper surface of the C-shaped plate 6. Two fixing blocks 7 are symmetrically fixedly installed on the outer surfaces of opposite sides of the sampling box 3. A motor 9 is fixedly installed on the upper surface of the C-shaped plate 6. The output end of the motor 9 passes through the upper surface of the C-shaped plate 6 and is fixedly installed with a screw 8. The bottom end of the screw 8 is rotatably installed with the outer surface of the sampling box 3. The screw 8 passes through the outer surface of one of the fixing blocks 7 and is threadedly connected to it. A limiting component is provided between the C-shaped plate 6 and the sampling box 3.

[0048] In this embodiment, the limiting component includes a guide rod 10 fixedly installed between the C-shaped plate 6 and the sampling box 3. The guide rod 10 passes through the outer surface of a fixing block 7 away from the screw 8 and is slidably installed therewith.

[0049] In this embodiment, the sealing mechanism includes a movable plate 14 that is slidably installed on the inner wall of the sampling box 3. A baffle 18 is fixedly installed on the lower surface of the movable plate 14. The baffle 18 is slidably installed on the bottom wall of the sampling box 3. The inner wall of the sampling box 3 is provided with a support mechanism.

[0050] In this embodiment, the support mechanism includes multiple fixed tubes 12 that are uniformly fixedly installed on the inner wall of the sampling box 3. A movable rod 13 is inserted inside the multiple fixed tubes 12. One end of the movable rod 13 away from the fixed tube 12 is fixedly installed on the outer surface of the movable plate 14. A retaining ring 20 is fixedly installed on the other end of the movable rod 13. A limit ring 21 is fixedly installed on the inner wall of the end of the fixed tube 12 close to the movable plate 14.

[0051] In this embodiment, a compression spring 19 is fixedly installed between the moving plate 14 and the inner wall of the sampling box 3.

[0052] In this embodiment, a guide plate 16 is fixedly installed on the upper surface of the movable plate 14. The guide plate 16 is inclined to the side away from the piston block 4, and an L-shaped limiting plate 17 is fixedly installed on the upper surface of the guide plate 16.

[0053] In this embodiment, a rubber sealing ring 23 is fixedly installed on the outer surface of the pipe body 1 near the rectangular opening 2.

[0054] In this embodiment, its usage method includes the following steps:

[0055] 1. When detecting the SF6 gas decomposition components inside the pipeline body 1, the screw 8 drives the sampling box 3 to penetrate into the interior of the pipeline body 1.

[0056] 2. Cylinder 5 drives piston block 4 to rise, extracting part of the SF6 gas in pipeline body 1 into sampling box 3.

[0057] 3. When the piston block 4 rises to the top of the sampling box 3, the baffle 18 blocks the sampling hole 15 to prevent gas from entering the pipeline body 1.

[0058] Fourth, the decomposition components of SF6 gas are detected by the gas detection sensor 11 installed on the piston block 4.

[0059] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: When detecting the decomposition components of SF6 gas inside the pipeline body 1, the motor 9 is started, causing the motor 9 to drive the screw 8 to rotate, causing the screw 8 to drive the sampling box 3, which is threadedly connected to it through the fixing block 7, to move into the interior of the pipeline body 1, so as to move the sampling hole 15 opened on the sampling box 3 to the center position of the pipeline body 1, thereby facilitating the sampling of SF6 gas at the center of the pipeline body 1 and improving the consistency of the sample taken; after the sampling box 3 is inserted into the pipeline body 1, the cylinder 5 is started, causing the cylinder 5 to drive the piston block 4 to move upward, so that the piston block 4 draws the SF6 gas at the center position of the pipeline body 1 into the sampling box 3, and when the piston block 4 rises to the guide plate 16, The moving plate 14, under the elastic force of the compression spring 19, will drive the baffle 18 fixedly installed on its lower surface to move towards the sampling hole 15, so that the baffle 18 gradually blocks the sampling hole 15, preventing the SF6 gas in the pipeline body 1 from mixing with the SF6 gas extracted from the sampling box 3, thus avoiding affecting the concentration of the sampled SF6 gas and the accuracy of the detection. After the detection is completed, the cylinder 5 will push the piston block 4 downward, so that the piston block 4 discharges the SF6 gas extracted from the sampling box 3 into the pipeline body 1, thus avoiding the waste of gas. By fixing the rubber sealing ring 23 at the rectangular opening 2 of the pipeline body 1, the rubber sealing ring 23 can seal the gap between the sampling box 3 and the rectangular opening 2, thus preventing the leakage of SF6 gas in the pipeline body 1.

[0060] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0061] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A system for detecting SF6 gas decomposition components in a GIS pipeline, comprising a pipeline body (1), characterized in that, A rectangular opening (2) is provided through the outer surface of the pipe body (1). A sampling box (3) is slidably installed on the inner wall of the rectangular opening (2). A sampling hole (15) is provided through the bottom wall of the sampling box (3). A piston block (4) is slidably installed on the inner wall of the sampling box (3). A cylinder (5) is fixedly installed at the top of the sampling box (3). The telescopic end of the cylinder (5) passes through the top of the sampling box (3) and is fixedly installed on the upper surface of the piston block (4). A through hole is provided through the upper surface of the piston block (4). A gas detection sensor (11) is fixedly installed on the inner wall of the through hole. A lifting mechanism for lifting the sampling box (3) is provided on the outer surface of the pipe body (1) near the rectangular opening (2). A sealing mechanism is provided inside the sampling box (3). The sealing mechanism includes a movable plate (14) that is slidably installed on the inner wall of the sampling box (3). A baffle (18) is fixedly installed on the lower surface of the movable plate (14). The baffle (18) is slidably installed on the bottom wall of the sampling box (3). The inner wall of the sampling box (3) is provided with a support mechanism. The support mechanism includes multiple fixed tubes (12) uniformly fixedly installed on the inner wall of the sampling box (3). A movable rod (13) is inserted inside the multiple fixed tubes (12). The end of the movable rod (13) away from the fixed tube (12) is fixedly installed on the outer surface of the movable plate (14). A retaining ring (20) is fixedly installed on the other end of the movable rod (13). A limit ring (21) is fixedly installed on the inner wall of the end of the fixed tube (12) close to the movable plate (14). A compression spring (19) is fixedly installed between the movable plate (14) and the inner wall of the sampling box (3). A guide plate (16) is fixedly installed on the upper surface of the movable plate (14). The guide plate (16) is inclined to the side away from the piston block (4). An L-shaped limiting plate (17) is fixedly installed on the upper surface of the guide plate (16).

2. The SF6 gas decomposition component detection system in a GIS pipeline according to claim 1, characterized in that, The lifting mechanism includes a C-shaped plate (6) fixedly installed on the outer surface of the pipe body (1). A rectangular groove (22) matching the cylinder (5) is opened through the upper surface of the C-shaped plate (6). Two fixing blocks (7) are symmetrically fixedly installed on the outer surfaces of the sampling box (3) on opposite sides. A motor (9) is fixedly installed on the upper surface of the C-shaped plate (6). The output end of the motor (9) passes through the upper surface of the C-shaped plate (6) and is fixedly installed with a screw (8). The bottom end of the screw (8) is rotatably installed with the outer surface of the sampling box (3). The screw (8) passes through the outer surface of one of the fixing blocks (7) and is threadedly connected to it. A limiting component is provided between the C-shaped plate (6) and the sampling box (3).

3. The SF6 gas decomposition component detection system in a GIS pipeline according to claim 2, characterized in that, The limiting component includes a guide rod (10) fixedly installed between the C-shaped plate (6) and the sampling box (3), the guide rod (10) passing through the outer surface of a fixing block (7) away from the screw (8) and slidably installed therewith.

4. The SF6 gas decomposition component detection system in a GIS pipeline according to claim 1, characterized in that, A rubber sealing ring (23) is fixedly installed on the outer surface of the pipe body (1) near the rectangular opening (2).

5. A method for detecting SF6 gas decomposition components in GIS pipelines, characterized in that: The detection method using the SF6 gas decomposition component detection system in GIS pipelines according to any one of claims 1-4 includes the following steps:

1. When detecting the SF6 gas decomposition components inside the pipeline body (1), the screw (8) drives the sampling box (3) to penetrate into the interior of the pipeline body (1); 2. The cylinder (5) drives the piston block (4) to rise, extracting part of the SF6 gas in the pipeline body (1) into the sampling box (3); 3. When the piston block (4) rises to the top of the sampling box (3), the baffle (18) blocks the sampling hole (15) to prevent gas from entering the pipeline body (1); IV. The decomposition components of SF6 gas are detected by a gas detection sensor (11) installed on the piston block (4).

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