A device for detecting leakage of SF6 gas

Abstract

The utility model relates to the field of electric power equipment detection, concretely relates to a kind of detection device of SF6 gas leakage, including body and probe tube, the probe tube is extended along the body top and is communicated with the body inner cavity outside, the probe tube inside is equipped with the core pipe of both ends of the probe tube, the free end of the probe tube outside is detachably connected with the probe of accommodating core pipe end part extension, the outer end of the core pipe is fixed with the movable member that can slide in probe, the one end of the core pipe is connected with operating element in the body, the body bottom is provided with the sleeve of accommodating operating element, and the sleeve is used to pull operating element to drive core pipe and movable member and probe produce relative sliding. Advantageous effect lies in: the utility model can effectively prevent dust, water, oil and other pollutants to invade probe, can also quickly remove detection channel and body inner cavity residual gas, while giving consideration to operation convenience and detection accuracy.

Description

Technical Field

[0001] This utility model relates to the field of power equipment testing, specifically to a detection device for SF6 gas leakage. Background Technology

[0002] SF6 gas, an inert gas with excellent insulation and arc-extinguishing properties, is widely used in power equipment such as high-voltage circuit breakers and gas-insulated switches. Its sealing performance directly affects the safe and stable operation of the power system. Therefore, accurate detection of SF6 gas leaks is a crucial aspect of power equipment operation and maintenance.

[0003] Currently, SF6 gas leak detection devices on the market mainly detect the concentration of SF6 gas in a specific area using gas sensors. Their core principle is to utilize the sensor's specific response to SF6 gas to output an electrical signal, which is then processed by circuitry to convert into a recognizable detection result. Existing detection devices typically expose their probes directly to the detection environment, with their air inlets remaining open for extended periods. In power equipment maintenance sites, a long, narrow probe tube is often needed to support the probe and extend it into the space to be tested. The area being tested may contain a large amount of dust, oil, water, and other substances. These impurities gradually accumulate in the gas path after contacting the probe, causing blockages.

[0004] Furthermore, during multiple consecutive testing operations, the existing device's probe tube, serving as a crucial channel connecting the probe and the machine body, is prone to gas stagnation due to its narrow internal space. After completing one SF6 gas test, a certain amount of SF6 gas molecules remain in the gas detection channel within the probe tube and in the internal cavity of the machine body. These residual molecules cannot naturally diffuse and clear within the narrow gas detection probe tube in a short time. If the next test is performed directly, the residual SF6 gas molecules will mix with the newly introduced detection gas, causing the sensor to be continuously stimulated, resulting in the detection data failing to return to zero, and even false alarms. The probe needs to be placed in clean air for static reset, waiting for the detection data to return to zero. This residual interference severely affects the accuracy of the test results. Utility Model Content

[0005] The purpose of this invention is to provide an SF6 gas leak detection device to solve the above problems. It can effectively prevent dust, water, oil and other contaminants from entering the probe, and can quickly remove residual gas in the detection channel and internal cavity of the machine. At the same time, it takes into account both ease of operation and detection accuracy. See the following description for details.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This utility model provides an SF6 gas leak detection device, including a body and a probe. The probe extends outward along the top of the body and communicates with the inner cavity of the body. A core tube with both ends extending out of the probe is sleeved inside the probe. A probe is detachably connected to the free end of the probe to accommodate the end of the core tube. A movable component that can slide inside the probe is fixed to the outer end of the core tube. An operating component is connected to one end of the core tube that extends into the body. A retaining sleeve is provided at the bottom of the body to accommodate the operating component, and the retaining sleeve is used to pull the operating component to drive the core tube and the movable component to slide relative to the probe. The probe tube and the core tube form a gas detection channel that connects to the internal cavity of the machine body. A gas sensor as a detection element is installed in the internal cavity of the machine body. The probe is a cylindrical structure with its outer end closed. Multiple external holes are provided around the outer circumference of the probe. The movable part is an annular component that fits the inner wall of the probe. Multiple sets of internal holes are provided around the outer circumference of the movable part. The internal holes slide with the probe and can communicate with the external holes to form the air inlet of the gas detection channel.

[0007] When using the above-mentioned SF6 gas leak detection device, to perform probe detection on the device under test, hold the machine body and insert one end of the probe tube into the area to be tested. When the probe reaches the test position, pull down the sleeve to move the air inlet tube relative to the machine body downward. At the same time, the air inlet tube sequentially moves the piston block, air outlet tube, core tube, and movable part downward. At this time, the movable part moves relative to the probe until the inner hole of the movable part coincides with the outer hole of the probe. At this time, the air inlet of the gas detection channel opens, and the gas in the area to be tested enters the gas detection channel along the air inlet and is introduced into the inner cavity of the machine body. The detection unit inside the machine body tests whether there is an SF6 gas leak. After the test is completed, the movable part is reset by using a spring, the inner hole and the outer hole are offset to close the air inlet, and at the same time, the core tube, air outlet tube, piston block, and air inlet tube are pulled up to reset, completing the probe sealing action. During the opening of the air inlet, the pull-down sleeve moves the air inlet pipe and piston block downwards. During this process, the volume of the upper air chamber inside the piston cylinder increases, and external air is drawn into the piston cylinder through the one-way valve at the bottom of the air inlet pipe to complete the preparation of flushing air. During the closing of the air inlet at the end of the single-point detection, each component is reset under the action of spring thrust. At this time, the volume of the upper air chamber inside the piston cylinder decreases, and the stored flushing air is discharged upwards into the probe through the guide hole, the air outlet pipe and the core tube. Since the air inlet is closed at this time, the flushing air flows back into the machine body through the gas detection channel between the core tube and the probe tube to flush the detection unit in the machine body, so as to avoid the presence of SF6 gas in the gas detection channel and the internal cavity of the machine body after the end of the previous point detection, which would affect the detection results of the next point. When it is necessary to repeatedly and thoroughly flush the gas detection channel and the internal cavity of the machine with clean air, repeatedly squeeze the sleeve upwards to deliver air into the gas detection channel through the operating device and back into the internal cavity of the machine to complete the flushing process.

[0008] Preferably, the bottom of the movable component is surrounded and fixed with multiple support rods connected to the top of the core tube. The outer end of the probe is provided with a mounting ring. A spring is sleeved between the movable component and the mounting ring on the outside of the support rods. The spring is used to push the movable component upward to keep the inner hole and the outer hole misaligned.

[0009] Preferably, the bottom end of the probe is sleeved outside the mounting ring, and the probe is connected to the mounting ring by threads or clamps.

[0010] Preferably, the body includes two sets of semi-shell-shaped housings, each set of housings having a bundled tube seat that is combined into a circular probe mounting structure at the top, and the bottom of the probe having a fixing ring fitted around the bundled tube seat.

[0011] Preferably, the two housings are provided with semi-annular threaded rings with opposite openings for mounting the sleeve. The sleeve includes a vertically extending corrugated cylinder with a fastening ring threaded to the top of the corrugated cylinder and a base fixed to the bottom of the corrugated cylinder.

[0012] Preferably, the operating component includes a piston cylinder sleeved inside the corrugated cylinder and extending into the machine body. A piston block is slidably and sealed inside the piston cylinder. A vertically extending air inlet pipe and an air outlet pipe are provided in the middle of the piston block. The air inlet pipe is connected to the bottom end of the air outlet pipe. The bottom end of the air inlet pipe extends out of the base, and a one-way valve that allows air to be drawn in only upwards is provided at the bottom end of the air inlet pipe.

[0013] Preferably, the outer wall of the bottom end of the vent pipe is provided with a guide hole that communicates with the inner cavity of the piston cylinder, the top end of the vent pipe extends upward through the piston cylinder and communicates with the core tube, and the piston cylinder slides and seals with the outer wall of the vent pipe.

[0014] Preferably, the core tube is a flexible non-elastic tube, and a cap is provided at the bottom end of the core tube. The cap is fitted onto the top end of the air outlet pipe and threadedly connected to the air outlet pipe. A one-way valve is provided at the top end of the core tube, which only allows air to be discharged outward along the core tube into the gas detection channel.

[0015] The beneficial effects are as follows: 1. The probe of this utility model is a cylindrical structure with a closed outer end, and the movable part is an annular component that fits the inner wall of the probe. The inner hole can slide with the movable part to communicate with or be offset from the outer hole of the probe. During detection, the inner hole of the movable part and the outer hole of the probe are connected to form an air intake channel. In the non-detection state, the movable part is pushed by a spring, and the inner hole and the outer hole are offset. The outer hole of the probe is blocked by the movable part, which structurally blocks dust, water and oil from directly entering the gas detection channel between the core tube and the probe tube, avoids impurities from contaminating the sensor, and ensures detection accuracy and instrument life. 2. The bottom of the probe is connected to the mounting ring at the outer end of the probe tube by a thread or clamp. The detachable structure facilitates regular cleaning and replacement of the probe. If the probe or probe tube is contaminated, the corresponding parts can be quickly disassembled and replaced, reducing the risk of performance degradation caused by long-term contamination and ensuring the probe continues to work reliably. At the same time, the internal core tube and moving parts can still be reused, and only the external probe or probe tube needs to be replaced, reducing the long-term use cost of the equipment. 3. After the test is completed, the piston block slides inside the piston cylinder by pulling the operating component through the sleeve. Clean air is actively pumped and flows sequentially along the path of the air inlet pipe, piston cylinder, air outlet pipe, and core tube to the gas detection channel. This flushes and replaces the residual gas to be tested in the probe tube and the internal cavity of the machine, thereby quickly removing the residual gas to be tested, solving the problem of repeated residual interference during multiple tests, and ensuring the accuracy of the test data. 4. The core tube is sleeved inside the probe tube, forming a gas detection channel that connects the internal cavity of the machine. The core tube is a flexible non-elastic tube, which not only ensures a clear gas transmission path, but also ensures the removal effect of residual gas by adapting the flexibility of the core tube to the pulling displacement of the operating component when air is pumped through the operating component. 5. The screw ring at the bottom of the housing and the fastening ring of the sleeve are connected by threads, which can enable quick installation and removal of the sleeve. The corrugated cylinder has the structural characteristics of elastic stretching and reset, which can be used as an operating control structure, and also as a handle for holding the whole equipment, reducing the overall size of the machine and making it easy to carry and use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is the main view structural diagram of this utility model; Figure 2 This is a three-dimensional structural schematic diagram of the present invention; Figure 3 This is a structural breakdown diagram of the present invention; Figure 4 This is a partial structural disassembly diagram of this utility model; Figure 5 This is the right view of the present invention; Figure 6 This is a structural cross-sectional view of part AA of this utility model; Figure 7 This is a structural cross-sectional view of part BB of this utility model.

[0018] The annotations in the attached figures are explained as follows: 1. Body; 101. Housing; 102. Bundle tube seat; 103. Threaded ring; 2. Probe tube; 201. Fixing ring; 202. Mounting ring; 3. Core tube; 301. Tube cap; 4. Probe; 401. Outer hole; 5. Moving parts; 501. Inner hole; 502. Support rod; 503. Spring; 6. Operating parts; 601. Piston cylinder; 602. Piston block; 603. Inlet pipe; 604. Outlet pipe; 604a. Guide hole; 7. Bundle sleeve; 701. Corrugated cylinder; 702. Fastening ring; 703. Base. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] See Figures 1-7 As shown, this utility model provides an SF6 gas leak detection device, including a body 1 and a probe 2. The probe 2 extends outward along the top of the body 1 and connects to the inner cavity of the body 1. A core tube 3 with both ends extending out of the probe 2 is sleeved inside the probe 2. A probe 4 is detachably connected to the free end of the probe 2 to accommodate the end of the core tube 3. A movable part 5 that can slide inside the probe 4 is fixed to the outer end of the core tube 3. An operating part 6 is connected to one end of the core tube 3 that extends into the body 1. A retaining sleeve 7 is provided at the bottom of the body 1 to accommodate the operating part 6. The retaining sleeve 7 is used to pull the operating part 6 to drive the core tube 3 and the movable part 5 to slide relative to the probe 4. The probe tube 2 and the core tube 3 form a gas detection channel that connects to the inner cavity of the body 1, allowing the external gas to be tested to enter the body 1 and be detected by the gas sensor. The gas sensor, which serves as the detection element, is installed in the inner cavity of the body 1. The probe 4 is a cylindrical structure with its outer end closed. Multiple external holes 401 are arranged around the outer circumference of the probe 4. The movable part 5 is an annular component that fits against the inner wall of the probe 4. Multiple sets of internal holes 501 are arranged around the outer circumference of the movable part 5. The internal holes 501 slide with the probe 4 and can communicate with the external holes 401 to form the air inlet of the gas detection channel, which is used to precisely control the timing and path of the gas to be tested entering the detection channel.

[0021] As an optional implementation, the bottom of the movable part 5 is surrounded and fixed with multiple support rods 502 connected to the top of the core tube 3. The outer end of the probe tube 2 is provided with a mounting ring 202. A spring 503 is sleeved between the movable part 5 on the outside of the support rods 502 and the mounting ring 202. The spring 503 is used to push the movable part 5 upward to keep the inner hole 501 and the outer hole 401 misaligned. With this configuration, the inner hole 501 and the outer hole 401 can be stably kept misaligned in the non-detection state through the elastic pushing action of the spring 503, effectively blocking dust, water, oil and other impurities from entering the detection channel and protecting the internal detection element. The bottom end of the probe 4 is fitted onto the outside of the mounting ring 202, and the probe 4 is connected to the mounting ring 202 by threads or clamps, preferably by threads. This arrangement facilitates the quick installation and removal of the probe 4, making it easier to clean, maintain or replace the probe 4 later. In addition, the threaded connection has good sealing performance, which can reduce the intrusion of external impurities from the connection part. The body 1 includes two sets of semi-shell-shaped housings 101. The top of each set of housings 101 is provided with a bundled tube seat 102 that is combined into a circular probe 2 mounting structure. The bottom end of the probe 2 is provided with a fixing ring 201 that is sleeved on the outside of the bundled tube seat 102. This arrangement facilitates the assembly and disassembly of the body 1. During manufacturing, the two sets of semi-shell-shaped housings 101 can be processed separately, reducing the processing difficulty. At the same time, when repairing the internal components of the body 1, it is also more convenient to disassemble the housings 101 for operation. The bottom ends of the two housings 101 are provided with semi-annular threaded rings 103 with openings facing each other for mounting the sleeve 7. The sleeve 7 includes a vertically extending corrugated cylinder 701. The top end of the corrugated cylinder 701 is fixed with a fastening ring 702 that is threaded to the threaded ring 103, and the bottom end of the corrugated cylinder 701 is fixed with a base 703. This arrangement achieves a stable connection between the sleeve 7 and the housing 1 through the threaded engagement. On the other hand, the corrugated cylinder 701 can be stretched or compressed within a certain range to accommodate the pulling operation of the operating component 6. The base 703 can increase the stability of the sleeve 7 when it is placed. The operating component 6 includes a piston cylinder 601 fitted inside the corrugated cylinder 701 and extending into the machine body 1. The piston cylinder 601 has a piston block 602 that is slidably sealed inside. The piston block 602 has a vertically extending air inlet pipe 603 and an air outlet pipe 604 in the middle. The air inlet pipe 603 is connected to the bottom end of the air outlet pipe 604. The bottom end of the air inlet pipe 603 extends out of the base 703. The bottom end of the air inlet pipe 603 is provided with a one-way valve that only allows air to be drawn in one direction upward, thereby ensuring that outside air can only enter the piston cylinder 601 in one direction, providing a stable airflow source for subsequently delivering clean air to the detection channel to rinse residual gas. The bottom outer wall of the vent pipe 604 is provided with a guide hole 604a that connects to the inner cavity of the piston cylinder 601. The top end of the vent pipe 604 extends upward through the piston cylinder 601 and connects to the core tube 3. The piston cylinder 601 and the outer wall of the vent pipe 604 are slidably sealed so that the air in the piston cylinder 601 can smoothly enter the core tube 3 through the guide hole 604a and the vent pipe 604. At the same time, the sliding sealing structure can prevent gas leakage and ensure that the airflow is effectively delivered to the detection channel. The core tube 3 is a flexible, non-elastic tube designed to adapt to deformation when the operating element 6 pulls the core tube 3 to generate relative displacement. This prevents damage to the core tube 3 due to rigid tension or interference with the connection to other components. The bottom end of the core tube 3 is provided with a tube cap 301, which is fitted onto the top end of the air outlet pipe 604 and threadedly connected to the air outlet pipe 604. This ensures a stable connection between the core tube 3 and the air outlet pipe 604, facilitating the disassembly and assembly of the core tube 3 when replacing the probe 2. The top end of the core tube 3 is provided with a one-way valve that allows air to be discharged outward along the core tube 3 into the gas detection channel. This ensures that air can only be discharged in one direction into the detection channel. When flushing residual gas, this effectively removes the residual gas to be tested from the detection channel, preventing backflow from interfering with subsequent detection.

[0022] Using the above structure, when probing the device under test, hold the body 1 and insert one end of the probe 4 of the probe tube 2 into the area to be tested. When the probe 4 reaches the test position, pull down the sleeve 7 to move the air inlet pipe 603 downward relative to the body 1. At the same time, the air inlet pipe 603 sequentially moves the piston block 602, the air outlet pipe 604, the core tube 3, and the movable part 5 downward. At this time, the movable part 5 moves relative to the probe 4 until the inner hole 501 of the movable part 5 and the outer hole of the probe 4 are aligned. When 401 overlaps, the gas inlet of the gas detection channel opens, and the gas in the area to be tested enters the gas detection channel along the inlet and is introduced into the inner cavity of the body 1. The detection unit inside the body 1 tests whether there is SF6 gas leakage. After the test ends, the spring 503 pushes the movable part 5 to reset, the inner hole 501 and the outer hole 401 are staggered to close the inlet, and at the same time, the core tube 3, the outlet pipe 604, the piston block 602 and the inlet pipe 603 are pulled upward to reset, completing the sealing action of the probe 4. During the opening of the air inlet, the pull-down sleeve 7 moves the air inlet pipe 603 and piston block 602 downward. During this process, the volume of the upper air chamber inside the piston cylinder 601 increases, and external air is drawn into the piston cylinder 601 through the one-way valve at the bottom of the air inlet pipe 603 to complete the preparation of flushing air. During the closing of the air inlet at the end of the single-point detection, each component is reset under the thrust of the spring 503. At this time, the volume of the upper air chamber inside the piston cylinder 601 decreases, and the stored flushing air is discharged upward through the guide hole 604a, the air outlet pipe 604 and the core tube 3 into the probe 4. Since the air inlet is closed at this time, the flushing air flows back into the body 1 through the gas detection channel between the core tube 3 and the probe tube 2 to flush the detection unit in the body 1, so as to avoid the presence of SF6 gas in the gas detection channel and the inner cavity of the body 1 after the end of the previous point detection, which would affect the detection results of the next point. When it is necessary to repeatedly and thoroughly flush the gas detection channel and the inner cavity of the machine body 1 with clean air, repeatedly squeeze the sleeve 7 upwards to deliver air into the gas detection channel through the operating piece 6 as an air pump and return it to the inner cavity of the machine body 1 to achieve the flushing process; The probe 4 of this invention is a cylindrical structure with a closed outer end. The movable part 5 is an annular component that fits the inner wall of the probe 4. The inner hole 501 can slide with the movable part 5 to communicate with or be offset from the outer hole 401 of the probe 4. During detection, the inner hole 501 of the movable part 5 communicates with the outer hole 401 of the probe 4 to form an air intake channel. In the non-detection state, the movable part 5 is pushed by the spring 503, and the inner hole 501 and the outer hole 401 are offset. The outer hole 401 of the probe 4 is blocked by the movable part 5, which structurally prevents dust, water and oil from directly entering the gas detection channel between the core tube 3 and the probe tube 2, avoids impurities from contaminating the sensor, and ensures detection accuracy and instrument life. The bottom of the probe 4 is connected to the mounting ring 202 at the outer end of the probe tube 2 by a thread or clamp. The detachable structure facilitates regular cleaning and replacement of the probe 4. If the probe 4 or the probe tube 2 is contaminated, the corresponding parts can be quickly disassembled and replaced, reducing the risk of performance degradation caused by long-term contamination and ensuring that the probe 4 continues to work reliably. At the same time, the internal core tube 3 and the moving parts 5 can still be reused. Only the external probe 4 or the probe tube 2 needs to be replaced, reducing the long-term use cost of the equipment. After the test is completed, the operating component 6 is pulled by the sleeve 7, and the piston block 602 slides in the piston cylinder 601. Clean air can be actively pumped and flows along the path of the air inlet pipe 603, piston cylinder 601, air outlet pipe 604, and core tube 3 to the gas detection channel. This flushes and replaces the residual gas to be tested in the probe tube 2 and the inner cavity of the machine body 1, thereby quickly removing the residual gas to be tested, solving the problem of repeated residual interference during multiple tests, and ensuring the accuracy of the test data. The core tube 3 is fitted inside the probe tube 2, forming a gas detection channel that connects to the inner cavity of the machine body 1. The core tube 3 is a flexible non-elastic tube, which not only ensures a clear gas transmission path, but also ensures the removal effect of residual gas by utilizing the flexibility of the core tube 3 to adapt to the pulling displacement of the operating component 6 when air is pumped through the operating component 6. The bottom threaded ring 103 of the housing 101 and the fastening ring 702 of the sleeve 7 are connected by threads, which enables the sleeve 7 to be quickly installed and removed. The corrugated cylinder 701 has the structural characteristics of being elastic, stretchable and reset, and can be used as the control structure of the operating component 6. It can also be used as the handle for holding the whole equipment, reducing the overall size of the machine and making it easy to carry and use.

[0023] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A detection device for SF6 gas leakage, characterized in that: The device includes a body (1) and a probe (2). The probe (2) extends outward along the top of the body (1) and connects to the inner cavity of the body (1). A core tube (3) with both ends extending out of the probe (2) is sleeved inside the probe (2). A probe (4) is detachably connected to the free end of the probe (2) to accommodate the end of the core tube (3). A movable part (5) that can slide inside the probe (4) is fixed to the outer end of the core tube (3). An operating part (6) is connected to one end of the core tube (3) that extends into the body (1). A sleeve (7) is provided at the bottom of the body (1) to accommodate the operating part (6). The sleeve (7) is used to pull the operating part (6) to drive the core tube (3) and the movable part (5) to slide relative to the probe (4). The probe (2) and the core tube (3) form a gas detection channel that connects to the inner cavity of the body (1). A gas sensor as a detection element is installed in the inner cavity of the body (1). The probe (4) is a cylindrical structure with a closed outer end. Multiple outer holes (401) are provided around the outer circumference of the probe (4). The movable part (5) is an annular component that fits the inner wall of the probe (4). Multiple sets of inner holes (501) are provided around the outer circumference of the movable part (5). The inner holes (501) slide with the probe (4) and can communicate with the outer holes (401) to form the air inlet of the gas detection channel.

2. The SF6 gas leakage detection device according to claim 1, characterized in that: The bottom of the movable part (5) is fixed with multiple support rods (502) connected to the top of the core tube (3). The outer end of the probe (2) is provided with an installation ring (202). A spring (503) is sleeved between the movable part (5) on the outside of the support rod (502) and the installation ring (202). The spring (503) is used to push the movable part (5) upward to keep the inner hole (501) and the outer hole (401) in a staggered state.

3. The SF6 gas leakage detection device according to claim 2, characterized in that: The bottom end of the probe (4) is sleeved on the outside of the mounting ring (202), and the probe (4) is connected to the mounting ring (202) by threads or clamps.

4. The SF6 gas leak detection device according to claim 1, characterized in that: The body (1) includes two sets of semi-shell structure housings (101). The top of each set of housings (101) is provided with a bundle tube seat (102) that is combined into a circular probe (2) mounting structure. The bottom end of the probe (2) is provided with a fixing ring (201) sleeved on the outside of the bundle tube seat (102).

5. The SF6 gas leak detection device according to claim 4, characterized in that: The bottom ends of the two housings (101) are provided with semi-annular threaded rings (103) with openings facing each other for mounting the sleeve (7). The sleeve (7) includes a vertically extending corrugated cylinder (701). The top end of the corrugated cylinder (701) is fixed with a fastening ring (702) that is threaded to the threaded ring (103). The bottom end of the corrugated cylinder (701) is fixed with a base (703).

6. The SF6 gas leakage detection device according to claim 5, characterized in that: The operating component (6) includes a piston cylinder (601) sleeved inside the corrugated cylinder (701) and extending into the machine body (1). The piston cylinder (601) has a piston block (602) that is slidably sealed inside. The piston block (602) has a vertically extending air inlet pipe (603) and an air outlet pipe (604) in the middle. The air inlet pipe (603) is connected to the bottom end of the air outlet pipe (604). The bottom end of the air inlet pipe (603) extends out of the base (703). The bottom end of the air inlet pipe (603) is provided with a one-way valve that only allows air to be drawn in one direction upward.

7. The SF6 gas leak detection device according to claim 6, characterized in that: The bottom outer wall of the vent pipe (604) is provided with a guide hole (604a) that connects to the inner cavity of the piston cylinder (601). The top end of the vent pipe (604) extends upward through the piston cylinder (601) and connects to the core tube (3). The piston cylinder (601) and the outer wall of the vent pipe (604) are slidably sealed.

8. The SF6 gas leak detection device according to claim 7, characterized in that: The core tube (3) is a flexible non-elastic tube, and a cap (301) is provided at the bottom end of the core tube (3). The cap (301) is sleeved on the top end of the air outlet pipe (604) and threadedly connected to the air outlet pipe (604). A one-way valve is provided at the top end of the core tube (3) that only allows air to be discharged outward along the core tube (3) into the gas detection channel.

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