A chemical pipeline leak detection device

Abstract

The utility model discloses a chemical industry pipeline leak detection device relates to pipeline detection technical field, including installation structure and closed structure, and installation structure is installed in the pipe body outside, and the closed structure is installed on the installation structure and is used for plugging the gap between pipe body and installation structure, installation structure includes installation ring and partition board, and the installation ring is sleeved in the pipe body outside, and a plurality of partition boards are slidably installed on the partition board of installation ring, and one side of partition board is installed with air pressure sensor. The chemical industry pipeline leak detection device can be through the cooperation of partition board, movable block and elastic air bag and divide the annular space between installation ring and pipe body into a plurality of independent arc cavity, and every arc cavity is provided with the branch of air pressure sensor and inflation unit, so as to be convenient for realizing leak detection operation through the air pressure change in every arc cavity in the inflation process, thereby the position of small leak is conveniently and accurately locked, effectively improves leak detection positioning accuracy, enhances the practicality of device.

Description

Technical Field

[0001] This utility model relates to the field of pipeline inspection technology, and more specifically, to a leak detection device for chemical pipelines. Background Technology

[0002] Chemical pipelines are closed pressure systems composed of pipes, fittings, valves, flanges, supports, etc., designed to meet specific process requirements. They are used for the transportation, distribution, mixing, separation, discharge, metering, or control of fluids (liquids, gases, slurries). They integrate knowledge from materials science, mechanics, fluid mechanics, chemistry, and mechanical engineering. Their core objective is to safely, reliably, and economically transport fluids from one point to another throughout their entire design life, while simultaneously meeting demanding process conditions and extreme safety standards.

[0003] Chinese utility model patent CN216243617U discloses a chemical pipeline leak detection device comprising a base plate, an electric air pump, a fixed block, a moving block, a detection sleeve, a mesh, a telescopic tube, and a sealing strip. The device adjusts the spacing of the detection sleeves via the telescopic tube and enhances the sealing effect using the sealing strip and raised strip, enabling precise detection of pipelines of different diameters. It solves the problems of existing chemical pipeline leak detection devices being unable to detect small leaks in large or small chemical pipelines and being unsuitable for pipelines of different diameters. It also helps improve the precision and applicability of the detection, ensuring the integrity of the pipeline. However, while the above technical solution can detect small leaks at a certain section of the pipeline, the liquid flows into the pipe body during the detection process. Due to the confined space inside the pipe, it is impossible to accurately determine the specific location of the leak on that section, resulting in low leak detection accuracy and poor practicality. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a leak detection device for chemical pipelines, which divides the annular space between the installation ring and the pipe body into several arc-shaped cavities by setting a partition plate. Each arc-shaped cavity can be individually filled with air for leak detection, so as to effectively improve the leak detection and positioning accuracy and enhance the practicality of the device.

[0005] To achieve the above objectives, this utility model provides a chemical pipeline leak detection device, which is installed on the pipe body and includes an installation structure installed on the outside of the pipe body and a sealing structure installed on the installation structure for sealing the gap between the pipe body and the installation structure. The mounting structure includes a mounting ring sleeved on the outside of the pipe body and several partition plates slidably mounted on the mounting ring. The partition plates are evenly distributed in a ring on the mounting ring, and one end of the partition plate located on the inner side of the mounting ring is perpendicularly in contact with the outer wall of the pipe body. A pressure sensor is installed on one side of the partition plate. Several linkage structures for driving the adjacent partition plates to move synchronously are provided on the mounting ring. A drive component for driving the linkage structure to operate is also provided on the mounting ring. The closed structure includes movable blocks located on the front and rear sides of the mounting ring and fixedly connected to the partition plate, an elastic airbag installed on the inner side of the mounting ring and located between two adjacent movable blocks, and an inflation unit disposed on the mounting ring. The inflation unit is adapted to inflate the elastic airbag or the inner side of the mounting ring. Connecting rods fixedly connected to the movable blocks are installed on the front and rear sides of the partition plate.

[0006] Furthermore, the linkage structure includes a first connecting rod hinged to one side of the two partition plates, a slider rotatably mounted on the end of the first connecting rod away from the partition plate, two second sliding blocks fixedly mounted on the outside of the mounting ring and respectively used to guide the two sliders to move along a preset trajectory, and a connecting component for making the two sliders slide synchronously.

[0007] Furthermore, the connecting component includes a first slide fixedly installed on the outside of the mounting ring and located between the two second slides, and a second and a third connecting rod slidably connected at one end within the first slide. The other ends of the second and third connecting rods are rotatably connected to the two sliders respectively, and the ends of the second and third connecting rods located within the first slide are rotatably connected.

[0008] Furthermore, a convex block is installed at one end of the second connecting rod located inside the first slide block, and a concave block is installed at one end of the third connecting rod located inside the first slide block. A rotating rod that passes through the convex block and the concave block is slidably connected on the first slide block. First sliding grooves adapted to the sliding of the rotating rod are provided on both the front and rear sides of the first slide block. Limiting blocks are fixedly connected to both the front and rear sides of the rotating rod, and the size of the limiting blocks is larger than the width of the first sliding groove.

[0009] Furthermore, the number of driving components is less than the number of linkage structures, the center distance between two adjacent driving components is an integer multiple of the center distance between two adjacent linkage structures, and the driving components are installed on the first slide within the linkage structure.

[0010] Furthermore, the drive assembly includes an electric actuator mounted on the side of the first slide away from the mounting ring and a connecting block mounted on the output end of the electric actuator. The connecting block is located inside the first slide and is rotatably connected to the second connecting rod inside the first slide.

[0011] Furthermore, the connecting block is U-shaped, and the rotating rod extends through the connecting block to the front and rear sides of the first slide block.

[0012] Furthermore, the inflation unit includes an air guide channel formed in a ring within the mounting ring, an air pump mounted on the mounting ring and communicating with the air guide channel, and several three-way valves mounted within the mounting ring with one end communicating with the air guide channel. One end of the other two ends of the three-way valve is communicating with the elastic airbag, and the other end extends to the inside of the mounting ring.

[0013] Furthermore, a first air-blocking pad is provided on the side of the partition plate near the axis of the mounting ring, and a second air-blocking pad is provided on the side of the movable block near the axis of the mounting ring.

[0014] Furthermore, the movable block is arranged in an isosceles trapezoidal shape, and the tip of the movable block faces the axis of the mounting ring.

[0015] Compared with the prior art, this utility model has the following advantages and effects: 1. The chemical pipeline leak detection device of this utility model can uniformly divide the annular space between the installation ring and the pipe body into several independent arc-shaped cavities through the cooperation of the partition plate, the movable block and the elastic air bladder. Each arc-shaped cavity is equipped with a pressure sensor and a branch of the inflation unit, so as to realize the leak detection operation by the pressure change in each arc-shaped cavity during the inflation process. The arc-shaped cavity with abnormal pressure change is the location of the small leak. Thus, while realizing shaft section detection, the location of small leaks can be accurately determined, effectively improving the leak detection and positioning accuracy and enhancing the practicality of the device.

[0016] 2. The chemical pipeline leak detection device of this utility model can coaxially fix the installation ring to a pipe of any size through the movement of the partition plate and the movable block, thereby conveniently adapting to pipes of different sizes and effectively improving the applicability of the device. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the chemical pipeline leak detection device in the embodiments of this utility model; Figure 2 This is a front view structural schematic diagram of the chemical pipeline leak detection device in this embodiment of the utility model; Figure 3 This is a front view cross-sectional structural diagram of the chemical pipeline leak detection device in this embodiment of the present invention; Figure 4 This is a schematic diagram of the connection structure of the second and third connecting rods of the chemical pipeline leak detection device in this embodiment of the present invention; Figure 5 This is a side view sectional structural diagram of the chemical pipeline leak detection device in this embodiment of the present invention; Figure 6 This is a schematic diagram of the installation of the elastic airbag of the chemical pipeline leak detection device in this embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1-Installation structure; 11-Installation ring; 12-Separator plate; 121-First air-blocking pad; 122-Connecting rod; 2-Linkage structure; 21-First slide block; 211-Rotor; 22-Second slide block; 23-Slider; 24-First connecting rod; 25-Second connecting rod; 251-Convex block; 26-Third connecting rod; 261-Concave block; 3-Drive assembly; 31-Electric actuator; 32-Connecting block; 4- Enclosed structure; 41- Movable block; 411- Second air-blocking cushion; 42- Elastic airbag; 43- Inflation unit; 431- Air guide channel; 432- Air pump; 433- Three-way valve; 5-Barometric pressure sensor; 6-Tube body. Detailed Implementation

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

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Please see Figure 1-6As shown, this utility model embodiment provides a chemical pipeline leak detection device, which is installed on the pipe body 6 and includes an installation structure 1 and a sealing structure 4. The installation structure 1 is installed on the outside of the pipe body 6, and the sealing structure 4 is installed on the installation structure 1 and is used to seal the gap between the pipe body 6 and the installation structure 1.

[0022] The mounting structure 1 includes a mounting ring 11 and partition plates 12. The mounting ring 11 is sleeved on the outside of the pipe body 6. Several partition plates 12 are slidably mounted on the mounting ring 11. The partition plates 12 are evenly distributed in a ring on the mounting ring 11, and one end of the partition plate 12 located on the inner side of the mounting ring 11 is perpendicular to the outer wall of the pipe body 6. A pressure sensor 5 is installed on one side of the partition plate 12. Several linkage structures 2 for driving adjacent partition plates 12 to move synchronously are provided on the mounting ring 11. A drive assembly 3 for driving the linkage structure 2 to operate is also provided on the mounting ring 11.

[0023] The enclosed structure 4 includes a movable block 41, an elastic airbag 42, and an inflation unit 43. The movable block 41 is located on the front and rear sides of the mounting ring 11 and is fixedly connected to the partition plate 12. The elastic airbag 42 is installed on the front and rear sides of the mounting ring 11 and is located between two adjacent movable blocks 41. The inflation unit 43 is disposed on the mounting ring 11 and is adapted to inflate the elastic airbag 42 or the inside of the mounting ring 11. Connecting rods 122 fixedly connected to the movable block 41 are installed on the front and rear sides of the partition plate 12.

[0024] As a further description of the above scheme, the drive assembly 3 drives the linkage structure 2 to operate, allowing the partition plate 12 to slide within the mounting ring 11. When the partition plate 12 contacts the outer wall of the tube body 6, it can evenly divide the gap between the mounting ring 11 and the tube body 6 into several arc-shaped cavities. During this process, the movable blocks 41 located on both sides of the mounting ring 11 also adhere to the outer wall of the tube body 6 due to the movement of the partition plate 12. At this time, the elastic airbag 42 can be inflated by the inflation unit 43 to expand the elastic airbag 42, so as to fill the gap between the two adjacent movable blocks. The gaps between blocks 41 form a closed space inside the mounting ring 11, and with the partition plate 12, each arc-shaped cavity forms an independent cavity. Then, the inflation unit 43 can inflate the inside of the mounting ring 11, filling each arc-shaped cavity with gas. Each arc-shaped cavity has a pressure sensor 5. When the pressure sensor 5 senses that the pressure in the current arc-shaped cavity is decreasing rapidly, it indicates that there is a leak or crack in the current arc-shaped cavity area, thereby realizing the leak detection operation and clearly pointing out the location of the leak or crack.

[0025] As a preferred embodiment of the above solution, the initial shape of the elastic airbag 42 in this application is L-shaped. A portion of the elastic airbag 42 is located between two adjacent movable blocks 41, and another portion is located between the partition plate 12 and the movable blocks 41. The elastic airbag 42 is made of an elastomer material, such as silicone rubber, fluororubber, or EPDM rubber. When the elastic airbag 42 is inflated, it works with the movable blocks 41 and the partition plate 12 to divide the gap between the mounting ring 11 and the tube 6 into several independent arc-shaped cavities. Specifically, a reinforcing fabric can be provided on the side of the elastic airbag 42 near the inner cavity of the mounting ring 11 to improve the directional controllability of the elastic airbag 42 during expansion. This prevents the elastic airbag 42 from expanding into the narrow arc-shaped cavities while ensuring the free expansion amount. The reinforcing fabric can also effectively improve the sealing performance of the elastic airbag 42.

[0026] Please see Figure 1-3 As shown, the linkage structure 2 includes a first link 24, a slider 23, a second slide block 22, and a connecting component. The first link 24 is hinged to one side of the two partition plates 12. The slider 23 is rotatably mounted on the end of the first link 24 away from the partition plate 12. The two second slide blocks 22 are fixedly mounted on the outside of the mounting ring 11 and are used to guide the two sliders 23 to move along a preset trajectory. The connecting component is used to make the two sliders 23 slide synchronously. It is convenient to use the slider 23 to slide in the second slide block 22 to make the first link 24 push the partition plate 12 to slide in the mounting ring 11.

[0027] Please see Figure 1-3 As shown, the connecting components include a first slide block 21, a second connecting rod 25, and a third connecting rod 26. The first slide block 21 is fixedly installed on the outside of the mounting ring 11 and located between the two second slide blocks 22. One end of the second connecting rod 25 and the third connecting rod 26 is slidably connected inside the first slide block 21, and the other end of the second connecting rod 25 and the third connecting rod 26 is rotatably connected to the two sliders 23 respectively. The ends of the second connecting rod 25 and the third connecting rod 26 located inside the first slide block 21 are rotatably connected; this facilitates the use of the sliding of the second connecting rod 25 and the third connecting rod 26 inside the first slide block 21 to drive the sliders 23 to slide inside the second slide block 22.

[0028] Please see Figure 4 As shown, a convex block 251 is installed at one end of the second connecting rod 25 located inside the first slide block 21, and a concave block 261 is installed at one end of the third connecting rod 26 located inside the first slide block 21. A rotating rod 211 that passes through the convex block 251 and the concave block 261 is slidably connected on the first slide block 21. First sliding grooves that are adapted to the sliding of the rotating rod 211 are provided on both the front and rear sides of the first slide block 211. Limiting blocks are fixedly connected on both the front and rear sides of the rotating rod 211, and the size of the limiting blocks is larger than the width of the first sliding groove.

[0029] As a further description of the above scheme, when the convex block 251 is embedded in the concave block 261, the rotating rod 211 can pass through the convex block 251 and the concave block 261 to realize the rotational connection between the second link 25 and the third link 26. Moreover, the rotating rod 211 passes through the first slide block 21 through the first slide groove, so that the second link 25 and the third link 26 are slidably connected to the first slide block 21 at one end of the first slide block 21.

[0030] Please see Figure 1-5 As shown, the number of drive components 3 is less than the number of linkage structures 2, the center distance between two adjacent drive components 3 is an integer multiple of the center distance between two adjacent linkage structures 2, and the drive components 3 are installed on the first slide 21 inside the linkage structure 2.

[0031] Please see Figure 5 As shown, the drive assembly 3 includes an electric actuator 31 and a connecting block 32. The electric actuator 31 is installed on the side of the first slide block 21 away from the mounting ring 11. The connecting block 32 is installed on the output end of the electric actuator 31. The connecting block 32 is located inside the first slide block 21. The connecting block 32 is rotatably connected to the second connecting rod 25 and the third connecting rod 26 inside the first slide block 21. This facilitates the use of the connecting block 32 to drive the second connecting rod 25 and the third connecting rod 26 to slide within the first slide block 21.

[0032] Please see Figure 5 As shown, the connecting block 32 is U-shaped, and the rotating rod 211 extends through the connecting block 32 to the front and rear sides of the first slide block 21, so that the second connecting rod 25 and the third connecting rod 26 can be rotated and connected to the connecting block 32 by using the rotating rod 211.

[0033] Please see Figure 1-3 and Figure 5-6 As shown, the inflation unit 43 includes an air guide channel 431, an air pump 432, and a three-way valve 433. The air guide channel 431 is annularly formed within the mounting ring 11. The air pump 432 is mounted on the mounting ring 11 and communicates with the air guide channel 431. Several three-way valves 433 are mounted within the mounting ring 11 and are connected at one end to the air guide channel 431. One end of the other two ends of the three-way valve 433 is connected to the elastic airbag 42, and the other end extends to the inside of the mounting ring 11.

[0034] As a preferred embodiment of the above solution, the three-way valve 433 in this application is an electrically controlled valve, which facilitates the simultaneous adjustment of the flow path of fluid in all three-way valves 433.

[0035] Please see Figure 1-6As shown, a first air-blocking pad 121 is provided on the side of the partition plate 12 near the axis of the mounting ring 11, and a second air-blocking pad 411 is provided on the side of the movable block 41 near the axis of the mounting ring 11. When the partition plate 12 contacts the outer wall of the tube body 6 to act as a barrier, the first air-blocking pad 121 is used to achieve close contact between the partition plate 12 and the tube body 6, thereby effectively preventing gas from flowing through the gap between the partition plate 12 and the tube body 6. The second air-blocking pad 411 can maintain close contact between the movable block 41 and the tube body 6 when the movable block 41 is close to the outer wall of the tube body 6, preventing gas from flowing out from the gap between the movable block 41 and the tube body 6.

[0036] Please see Figure 1-3 As shown, the movable block 41 is arranged in an isosceles trapezoidal shape, and the tip of the movable block 41 faces the axis of the mounting ring 11; this facilitates the extension of the elastic airbag 42 towards the tube body 6 under the action of the inclined plane on the opposite side of the two adjacent movable blocks 41, so as to maintain contact with the tube body 6 and maintain good airtightness.

[0037] The working process of the above-mentioned chemical pipeline leak detection device is as follows: When using this chemical pipeline leak detection device, the first step is to place the mounting ring 11 on the pipe body 6 to be tested. Then, the electric push rod 31 in the drive assembly 3 is operated, so that the connecting block 32 drives one end of the second connecting rod 25 and the third connecting rod 26 to slide in the first slide block 21 via the rotating rod 211, so that the two sliders 23 slide in the second slide block 22, thereby causing the two sliders 23 to drive the partition plate 12 to slide in the mounting ring 11 via the first connecting rod 24. During this process, the sliding of the partition plate 12 will also drive the movement of one end of the first connecting rod 24 on the other side, so that the cooperation of the first connecting rod 24, the slider 23, the second slide block 22, the first slide block 21, the second connecting rod 25 and the third connecting rod 26 can make all the partition plates 12 move synchronously, so that the partition plate 12 can contact and clamp the tube body 6, and install the mounting ring 11 on the tube body 6; Furthermore, when the partition plate 12 is in motion, the movable block 41 can move with the partition plate 12 under the action of the connecting rod 122. When the partition plate 12 contacts the tube body 6, the movable block 41 also contacts the tube body 6. Then the vacuum pump 432 can be opened to supply air to the air guide channel 431. When the three-way valve 433 connects the air guide channel 431 with the elastic airbag 42, the operation of the vacuum pump 432 can cause the elastic airbag 42 to expand, thereby facilitating the filling of the gap between the movable block 41 and the partition plate 12 and the surface of the tube body 6, forming a closed annular space between the mounting ring 11 and the tube body 6, and the partition plate 12 divides this space into several independent arc-shaped cavities. After the elastic airbag 42 is inflated, the adjustable three-way valve 433 cuts off the connection between the air guide channel 431 and the elastic airbag 42, connecting the air guide channel 431 with the arc-shaped cavity between the mounting ring 11 and the tube body 6, so that the air pump 432 can be used to inflate the arc-shaped cavity. During this process, if there is no gap at the position corresponding to the arc-shaped cavity on the tube body 6, the pressure sensor 5 will continuously increase. However, if there is a gap at the position corresponding to the arc-shaped cavity on the tube body 6, air leakage will occur, causing the pressure sensor 5 to increase at a slower rate or not at all, so as to lock the position of the gap on the tube body 6 through the change of air pressure.

[0038] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A leak detection device for chemical pipelines, installed on the pipe body (6), characterized in that, It includes an installation structure (1) installed on the outside of the pipe body (6) and a sealing structure (4) installed on the installation structure (1) and used to seal the gap between the pipe body (6) and the installation structure (1). The mounting structure (1) includes a mounting ring (11) sleeved on the outside of the pipe body (6) and several partition plates (12) slidably mounted on the mounting ring (11). The partition plates (12) are evenly distributed in a ring on the mounting ring (11), and one end of the partition plate (12) located inside the mounting ring (11) is perpendicularly in contact with the outer wall of the pipe body (6). A pressure sensor (5) is installed on one side of the partition plate (12). Several linkage structures (2) for driving the adjacent partition plates (12) to move synchronously are provided on the mounting ring (11). A drive assembly (3) for driving the linkage structure (2) to operate is also provided on the mounting ring (11). The closed structure (4) includes movable blocks (41) located on the front and rear sides of the mounting ring (11) and fixedly connected to the partition plate (12), elastic airbags (42) installed on the inner side of the mounting ring (11) and located between two adjacent movable blocks (41), and inflation units (43) provided on the mounting ring (11). The inflation units (43) are adapted to inflate the elastic airbags (42) or the inner side of the mounting ring (11). Connecting rods (122) fixedly connected to the movable blocks (41) are installed on the front and rear sides of the partition plate (12).

2. The chemical pipeline leak detection device according to claim 1, characterized in that, The linkage structure (2) includes a first link (24) hinged to one side of the two partition plates (12), a slider (23) rotatably mounted on one end of the first link (24) away from the partition plate (12), two second slide blocks (22) fixedly mounted on the outside of the mounting ring (11) and respectively used to guide the two sliders (23) to move along a preset trajectory, and a connecting component for making the two sliders (23) slide synchronously.

3. The chemical pipeline leak detection device according to claim 2, characterized in that, The connecting component includes a first slide (21) fixedly installed on the outside of the mounting ring (11) and located between the two second slides (22), and a second connecting rod (25) and a third connecting rod (26) slidably connected at one end in the first slide (21). The other ends of the second connecting rod (25) and the third connecting rod (26) are rotatably connected to the two sliders (23) respectively. The ends of the second connecting rod (25) and the third connecting rod (26) located in the first slide (21) are rotatably connected.

4. The chemical pipeline leak detection device according to claim 3, characterized in that, The second connecting rod (25) has a convex block (251) installed at one end inside the first slide (21), and the third connecting rod (26) has a concave block (261) installed at one end inside the first slide (21). A rotating rod (211) that passes through the convex block (251) and the concave block (261) is slidably connected on the first slide (21). The first slide (21) has a first sliding groove on both the front and rear sides that is adapted to slide the rotating rod (211). A limiting block is fixedly connected on both the front and rear sides of the rotating rod (211), and the size of the limiting block is greater than the width of the first sliding groove.

5. The chemical pipeline leak detection device according to claim 4, characterized in that, The number of drive components (3) is less than the number of linkage structures (2), the center distance between two adjacent drive components (3) is an integer multiple of the center distance between two adjacent linkage structures (2), and the drive components (3) are installed on the first slide (21) inside the linkage structure (2).

6. The chemical pipeline leak detection device according to claim 5, characterized in that, The drive assembly (3) includes an electric actuator (31) mounted on the side of the first slide (21) away from the mounting ring (11) and a connecting block (32) mounted on the output end of the electric actuator (31). The connecting block (32) is located inside the first slide (21) and is rotatably connected to the second connecting rod (25) inside the first slide (21).

7. The chemical pipeline leak detection device according to claim 6, characterized in that, The connecting block (32) is U-shaped, and the rotating rod (211) extends through the connecting block (32) to the front and rear sides of the first slide (21).

8. The chemical pipeline leak detection device according to claim 1, characterized in that, The inflation unit (43) includes an air guide channel (431) formed in a ring within the mounting ring (11), an air pump (432) mounted on the mounting ring (11) and connected to the air guide channel (431), and a plurality of three-way valves (433) mounted within the mounting ring (11) and connected at one end to the air guide channel (431). One end of the other two ends of the three-way valve (433) is connected to the elastic airbag (42), and the other end extends to the inside of the mounting ring (11).

9. The chemical pipeline leak detection device according to claim 1, characterized in that, The partition plate (12) is provided with a first air-blocking pad (121) on the side near the axis of the mounting ring (11), and the movable block (41) is provided with a second air-blocking pad (411) on the side near the axis of the mounting ring (11).

10. The chemical pipeline leak detection device according to claim 1, characterized in that, The movable block (41) is arranged in an isosceles trapezoidal shape, and the tip of the movable block (41) faces the axis of the mounting ring (11).

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