Marine lng tank leakage detection device and method of using same

Abstract

The present application relates to the technical fields of gas detection, and discloses a marine LNG storage tank leakage detection device.The detection device comprises a storage tank body, one side of the storage tank body is fixedly connected with an exhaust pipe, one side of the exhaust pipe is provided with a connecting pipe, the surface of the exhaust pipe is fixedly connected with a first limiting plate, the surface of the connecting pipe is fixedly connected with a second limiting plate, an upper clamp is arranged between the first limiting plate and the second limiting plate, the bottom of the upper clamp is provided with a lower clamp, the bottom of the upper clamp is fixedly connected with an upper fixing seat on both sides, the top of the lower clamp is fixedly connected with a lower fixing seat on both sides, a lock tongue is slidably connected in the lower fixing seat in opposite directions, a lock groove is formed in the upper fixing seat at the corresponding position of the lock tongue, a pull plate is fixedly connected to the side of the lock tongue away from the lock groove, a slide rod is fixedly connected to the side of the pull plate away from the lock tongue, and the slide rod is clamped with a locking spring between the lower fixing seat, and a plurality of detectors are installed in the upper clamp and the lower clamp.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, specifically to a leak detection device for marine LNG storage tanks and its usage method. Background Technology

[0002] LNG (Liquefied Natural Gas) is the abbreviation for liquefied natural gas. Natural gas is a combustible gas naturally extracted from gas fields, primarily composed of methane. LNG is produced by cooling gaseous natural gas at atmospheric pressure to -162°C, causing it to condense into a liquid. Liquefaction of natural gas significantly saves storage and transportation space and offers advantages such as high calorific value and superior performance. LNG is a clean and efficient energy source. Importing LNG helps energy-consuming countries diversify their energy supply and ensure energy security, while exporting LNG helps natural gas-producing countries effectively develop their resources, increase foreign exchange earnings, and promote national economic development. Therefore, LNG trade is becoming a new hotspot in the global energy market. Natural gas is liquefied at low temperatures and stored in tanks during large-scale storage and transportation, requiring extremely high sealing performance. Leaks can cause explosions and serious accidents.

[0003] According to a search, Chinese patent document CN217559566U discloses a natural gas storage tank detection device, including an injection port and a gas outlet on a liquefied natural gas (LNG) storage tank. A liquid level detection device is installed inside the LNG storage tank. An injection pipe is connected to the injection port, and a gas outlet connection joint is provided on the gas outlet. A first gas monitoring mechanism is engaged on the outer wall of the gas outlet connection joint. A second gas monitoring mechanism is installed on the outer wall of the LNG storage tank. By engaging the first gas monitoring mechanism on the gas outlet connection joint and installing the second gas monitoring mechanism on the outer wall of the LNG storage tank, real-time monitoring of the gas outlet and the entire tank body of the LNG storage tank can be performed to prevent gas leaks, ensuring the safety of the entire LNG storage and avoiding dangers caused by leaks.

[0004] However, the aforementioned detection devices, as well as most detection devices on the market, still have the following problems: they are not convenient for quick installation and disassembly, and they can usually only detect whether there is a leak, making it difficult for operators to quickly find the location of the leak. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a marine LNG storage tank leakage detection device and its usage method. It features the advantages of enabling rapid installation and disassembly of the detector, allowing operators to determine the approximate location of the leak based on the concentration displayed by the detector, thus providing greater accuracy and speed, and solving the aforementioned technical problems.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A marine LNG storage tank leak detection device includes a storage tank body. An exhaust pipe is fixedly connected to one side of the storage tank body, and a control valve is installed on the exhaust pipe. A connecting pipe is provided on the side of the exhaust pipe opposite to the storage tank body. A first limiting plate is fixedly connected to the surface of the exhaust pipe, and a second limiting plate is fixedly connected to the surface of the connecting pipe. An upper clamp is provided between the first and second limiting plates, and the upper clamp abuts against the surfaces of the exhaust pipe and the connecting pipe. A lower clamp is provided at the bottom of the upper clamp, and the lower clamp abuts against the surfaces of the exhaust pipe and the connecting pipe. Upper fixing seats are fixedly connected to both sides of the bottom of the upper clamp. The top two sides of the lower clamp are fixedly connected to the corresponding positions of the upper fixing seats. The two lower fixing seats are slidably connected to each other inside. The two upper fixing seats are provided with locking grooves at the corresponding positions of the two locking tongues inside, and the locking grooves are engaged with the locking tongues. The side of the two locking tongues away from the locking grooves is fixedly connected to the pull plate, and the pull plate is slidably connected to the lower fixing seat. The side of the two pull plates away from the locking tongues is fixedly connected to the slide rod, and the slide rod is slidably connected to the lower fixing seat. The two slide rods are respectively clamped between the lower fixing seats and locking springs. Multiple detectors are installed inside the upper clamp and the lower clamp.

[0010] Preferably, the upper clamp has a concave cross-section, the lower clamp has a concave cross-section, and the upper fixing seat has an inverted L-shaped cross-section.

[0011] Preferably, the top side of the latch has an arc-shaped structure, and the cross-section of the slide bar has a "T"-shaped structure.

[0012] Preferably, positioning blocks are fixedly connected to both sides of the upper clamp and the lower clamp, and positioning grooves are provided inside the first limiting plate and the second limiting plate at corresponding positions of multiple positioning blocks, and the positioning grooves are slidably connected to the positioning blocks.

[0013] Preferably, the positioning groove has a "T" shaped cross-section, the positioning block has a "T" shaped cross-section, and the size of the positioning block is slightly smaller than the size of the positioning groove.

[0014] Preferably, the exhaust pipe is fixedly connected to a plurality of locking blocks on the side away from the storage tank body. The inside of the connecting pipe has limit grooves at corresponding positions of the multiple locking blocks, and the limit grooves are slidably connected to the locking blocks. The inside of the connecting pipe is slidably connected to a plurality of limiting blocks, and the surfaces of the limiting blocks and the locking blocks abut against each other. The side of the multiple limiting blocks away from the locking blocks is fixedly connected to a pull buckle, and the pull buckle is slidably connected to the connecting pipe. The multiple limiting blocks are respectively clamped with a return spring between them and the connecting pipe.

[0015] Preferably, the cross-section of the card block is L-shaped, and the top side of the card block is arc-shaped, one side of the limiting block is arc-shaped, and the cross-section of the pull buckle is T-shaped.

[0016] Preferably, a baffle is fixedly connected to the inner side of the exhaust pipe, and a sealing ring is slidably connected inside the baffle on the side near the connecting pipe, with the sealing ring abutting against the surface of the connecting pipe, and multiple support springs are clamped between the sealing ring and the baffle.

[0017] Preferably, the sealing ring has a "convex" shaped cross-section, and the baffle is an annular plate.

[0018] The present invention also provides a method for using the marine LNG storage tank leakage detection device, which is carried out using the above-mentioned marine LNG storage tank leakage detection device according to the following steps:

[0019] S1. First, align the locking block with the limiting groove. Slide the connecting end of the connecting pipe to the inside of the exhaust pipe. During the movement, the locking block presses against the limiting block. The limiting block moves under force and causes the return spring to contract. When the larger end of the locking block moves to one side of the limiting block, the return spring drives the limiting block to reset, thereby achieving the locking and limiting between the locking block and the limiting block, and thus achieving the installation and fixation of the connecting pipe.

[0020] S2. During the installation of the connecting pipe, the installation end of the connecting pipe squeezes the sealing ring, the sealing ring contracts under force and causes the support spring to contract. At the same time, the support spring drives the reverse force to make the sealing ring tightly press against the end of the connecting pipe, which can further enhance the sealing performance of the connection between the connecting pipe and the exhaust pipe.

[0021] S3. Then, slide the upper clamp and the lower clamp into the positioning groove between the first limit plate and the second limit plate according to the positioning blocks on both sides. Then, press the upper clamp and the lower clamp against each other. The lower fixed seat slides to the inside of the upper fixed seat. During the sliding process, the locking tongue is subjected to force and drives the pull plate and the slide rod to cause the locking spring to contract. When the locking tongue corresponds to the lock groove, the locking spring drives the locking tongue to reset through the slide rod and the pull plate, so that the locking tongue and the lock groove are engaged, thereby realizing the installation and fixation between the upper clamp and the lower clamp, and thus realizing the installation of the detector.

[0022] S4. After installation, open the control valve to discharge the gas in the storage tank. During use, multiple detectors will simultaneously detect the connection between the exhaust pipe and the connecting pipe. When there is a gas leak, the detector will display the gas concentration and issue an alarm to remind the staff to close the valve. The operator can determine the approximate location of the leak based on the concentration displayed by the detector.

[0023] Compared with the prior art, the present invention provides a leak detection device for marine LNG storage tanks, which has the following features:

[0024] Beneficial effects:

[0025] 1. The upper and lower clamps slide into the positioning groove between the first and second limiting plates according to the positioning blocks on both sides. Then, the upper and lower clamps are pressed against each other, the locking tongue is subjected to force and drives the pull plate and slide rod to cause the locking spring to contract. When the locking tongue corresponds to the locking groove, the locking spring drives the locking tongue to reset through the slide rod and pull plate, so that the locking tongue and the locking groove are engaged, thereby realizing the installation and fixation between the upper and lower clamps, and thus realizing the quick installation and disassembly of the detector.

[0026] 2. Multiple detectors are used to simultaneously detect the connection points of the exhaust pipe and connecting pipe. When a gas leak is detected, the detector displays the gas concentration and issues an alarm, reminding the staff to close the valve. The operator can determine the approximate location of the leak based on the concentration displayed by the detector, making the process more accurate and faster.

[0027] 3. Align the locking block on the exhaust pipe with the limiting groove of the connecting pipe, and slide the connecting end of the connecting pipe to the inside of the exhaust pipe. During the movement, the locking block presses against the limiting block, the limiting block moves under force and causes the return spring to contract. When the larger end of the locking block moves to one side of the limiting block, the return spring drives the limiting block to reset, thereby realizing the locking and limiting between the locking block and the limiting block, and thus realizing the installation and fixation of the connecting pipe, making the installation more convenient and faster. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0029] Figure 2 This is a top view of the present invention;

[0030] Figure 3 This is a side-view or bottom view of the present invention;

[0031] Figure 4 for Figure 3 Schematic diagram of the structure at point A;

[0032] Figure 5 This is a cross-sectional view of the present invention;

[0033] Figure 6 for Figure 5 Schematic diagram of the structure at point B;

[0034] Figure 7 for Figure 5 Schematic diagram of the structure at point C;

[0035] Figure 8 This is a schematic diagram of the connection structure between the upper and lower fixed bases of the present invention.

[0036] The components include: 1. Storage tank body; 2. Control valve; 3. First limiting plate; 4. Second limiting plate; 5. Detector; 6. Exhaust pipe; 7. Upper fixed seat; 8. Lower fixed seat; 9. Connecting pipe; 10. Positioning block; 11. Upper clamp; 12. Lower clamp; 13. Pull plate; 14. Pull buckle; 15. Return spring; 16. Limiting block; 17. Limiting groove; 18. Locking block; 19. Positioning groove; 20. Baffle; 21. Support spring; 22. Sealing ring; 23. Locking groove; 24. Locking tongue; 25. Slide rod; 26. Locking spring. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0038] Please see Figure 1-8 A marine LNG storage tank leak detection device includes a storage tank body 1. An exhaust pipe 6 is fixedly connected to one side of the storage tank body 1. A control valve 2 is installed on the exhaust pipe 6. A connecting pipe 9 is provided on the side of the exhaust pipe 6 away from the storage tank body 1. A first limiting plate 3 is fixedly connected to the surface of the exhaust pipe 6, and a second limiting plate 4 is fixedly connected to the surface of the connecting pipe 9. An upper clamp 11 is provided between the first limiting plate 3 and the second limiting plate 4, and the upper clamp 11 abuts against the surfaces of the exhaust pipe 6 and the connecting pipe 9. A lower clamp 12 is provided at the bottom of the upper clamp 11, and the lower clamp 12 abuts against the surfaces of the exhaust pipe 6 and the connecting pipe 9. Upper fixing seats 7 are fixedly connected to both sides of the bottom of the upper clamp 11, and the top of the lower clamp 12... Lower fixing seats 8 are fixedly connected to the corresponding positions of the upper fixing seats 7 on both sides. Locking tongues 24 are slidably connected to the interior of the two lower fixing seats 8. Locking grooves 23 are opened at the corresponding positions of the two locking tongues 24 in the interior of the two upper fixing seats 7, and the locking grooves 23 are engaged with the locking tongues 24. Pull plates 13 are fixedly connected to the side of the two locking tongues 24 away from the locking grooves 23, and the pull plates 13 are slidably connected to the lower fixing seats 8. Sliding rods 25 are fixedly connected to the side of the two pull plates 13 away from the locking tongues 24, and the sliding rods 25 are slidably connected to the lower fixing seats 8. Locking springs 26 are clamped between the two sliding rods 25 and the lower fixing seats 8 respectively. Multiple detectors 5 are installed inside the upper clamp 11 and the lower clamp 12.

[0039] Specifically, the upper clamp 11 has a concave cross-section, the lower clamp 12 has a concave cross-section, and the upper fixing seat 7 has an inverted L-shaped cross-section.

[0040] Specifically, the top side of the latch 24 has an arc-shaped structure, and the cross-section of the slide bar 25 has a "T"-shaped structure.

[0041] Specifically, positioning blocks 10 are fixedly connected to both sides of the upper clamp 11 and the lower clamp 12. Positioning grooves 19 are provided in the interior of the first limiting plate 3 and the second limiting plate 4 at corresponding positions of multiple positioning blocks 10, and the positioning grooves 19 are slidably connected to the positioning blocks 10.

[0042] Specifically, the positioning groove 19 has a "T" shaped cross-section, the positioning block 10 has a "T" shaped cross-section, and the size of the positioning block 10 is slightly smaller than that of the positioning groove 19.

[0043] Specifically, a plurality of locking blocks 18 are fixedly connected to the side of the exhaust pipe 6 away from the storage tank body 1. Limiting grooves 17 are opened in the interior of the connecting pipe 9 at corresponding positions of the multiple locking blocks 18, and the limiting grooves 17 are slidably connected to the locking blocks 18. A plurality of limiting blocks 16 are slidably connected to the interior of the connecting pipe 9, and the surfaces of the limiting blocks 16 and the locking blocks 18 abut against each other. A pull buckle 14 is fixedly connected to the side of the multiple limiting blocks 16 away from the locking blocks 18, and the pull buckle 14 is slidably connected to the connecting pipe 9. A return spring 15 is clamped between the multiple limiting blocks 16 and the connecting pipe 9 respectively.

[0044] Specifically, the cross-section of the latch 18 is L-shaped, and the top side of the latch 18 is arc-shaped, one side of the limiting block 16 is arc-shaped, and the cross-section of the pull buckle 14 is T-shaped.

[0045] Specifically, a baffle 20 is fixedly connected to the inner side of the exhaust pipe 6. A sealing ring 22 is slidably connected inside the baffle 20 on the side of the baffle 20 near the connecting pipe 9, and the surfaces of the sealing ring 22 and the connecting pipe 9 abut against each other. Multiple support springs 21 are clamped between the sealing ring 22 and the baffle 20.

[0046] Specifically, the sealing ring 22 has a "convex" shaped cross-section, and the baffle 20 is an annular plate.

[0047] The present invention also provides a method for using the marine LNG storage tank leakage detection device, which is carried out using the above-mentioned marine LNG storage tank leakage detection device according to the following steps:

[0048] S1. First, align the locking block 18 with the limiting groove 17. Slide the connecting end of the connecting pipe 9 to the inside of the exhaust pipe 6. During the movement, the locking block 18 presses the limiting block 16. The limiting block 16 moves under force and causes the return spring 15 to contract. When the larger end of the locking block 18 moves to one side of the limiting block 16, the return spring 15 drives the limiting block 16 to reset, thereby realizing the locking and limiting between the locking block 18 and the limiting block 16, and thus realizing the installation and fixation of the connecting pipe 9.

[0049] S2. During the installation of the connecting pipe 9, the installation end of the connecting pipe 9 squeezes the sealing ring 22. The sealing ring 22 is compressed by the force and causes the support spring 21 to contract. At the same time, the support spring 21 drives the reverse force to make the sealing ring 22 press tightly against the end of the connecting pipe 9, which can further enhance the sealing performance of the connection between the connecting pipe 9 and the exhaust pipe 6.

[0050] S3. Then, the upper clamp 11 and the lower clamp 12 are slid into the positioning groove 19 between the first limiting plate 3 and the second limiting plate 4 according to the positioning blocks 10 on both sides. Then, the upper clamp 11 and the lower clamp 12 are pressed against each other. The lower fixed seat 8 slides to the inside of the upper fixed seat 7. During the sliding process, the locking tongue 24 is subjected to force and drives the pull plate 13 and the slide rod 25 to cause the locking spring 26 to contract. When the locking tongue 24 corresponds to the locking groove 23, the locking spring 26 drives the locking tongue 24 to reset through the slide rod 25 and the pull plate 13, so that the locking tongue 24 and the locking groove 23 are engaged, thereby realizing the installation and fixation between the upper clamp 11 and the lower clamp 12, and thus realizing the installation of the detector 5.

[0051] S4. After installation, open the control valve 2 to discharge the gas in the storage tank body 1. During use, multiple detectors 5 simultaneously detect the connection between the exhaust pipe 6 and the connecting pipe 9. When there is a gas leak, the detector 5 displays the gas concentration and issues an alarm to remind the staff to close the valve. The operator can determine the approximate location of the leak based on the concentration displayed by the detector 5.

[0052] In use, first align the locking block 18 on the exhaust pipe 6 with the limiting groove 17 of the connecting pipe 9, and slide the connecting end of the connecting pipe 9 to the inside of the exhaust pipe 6. During the movement, the locking block 18 presses the limiting block 16, the limiting block 16 moves under force and causes the return spring 15 to contract. When the larger end of the locking block 18 moves to one side of the limiting block 16, the return spring 15 drives the limiting block 16 to reset, thereby realizing the locking and limiting between the locking block 18 and the limiting block 16, and thus realizing the installation and fixation of the connecting pipe 9. Pull the buckle 14, the buckle 14 drives the limiting block 16 to disengage from the locking block 18, and the connecting pipe 9 can be disassembled. The structure is simple and facilitates the quick installation and disassembly of the connecting pipe 9.

[0053] During the installation of the connecting pipe 9, the installation end of the connecting pipe 9 squeezes the sealing ring 22. The sealing ring 22 is compressed under force, which causes the support spring 21 to contract. At the same time, the support spring 21 drives the reverse force to make the sealing ring 22 tightly press against the end of the connecting pipe 9, which can fill the gap between the connecting pipe 9 and the exhaust pipe 6, and further enhance the sealing performance of the connection between the connecting pipe 9 and the exhaust pipe 6.

[0054] Then, the upper clamp 11 and lower clamp 12 are slid into the positioning groove 19 between the first limiting plate 3 and the second limiting plate 4 according to the positioning blocks 10 on both sides. Then, the upper clamp 11 and lower clamp 12 are pressed against each other, and the lower fixed seat 8 slides to the inside of the upper fixed seat 7. During the sliding process, the locking tongue 24 is subjected to force and drives the pull plate 13 and the slide rod 25 to cause the locking spring 26 to contract. When the locking tongue 24 corresponds to the locking groove 23, the locking spring 26 drives the locking tongue 24 to reset through the slide rod 25 and the pull plate 13, so that the locking tongue 24 and the locking groove 23 are engaged, thereby realizing the installation and fixation between the upper clamp 11 and the lower clamp 12, and thus realizing the installation of the detector 5. After installation, control valve 2 is opened to discharge the gas in storage tank 1. During use, multiple detectors 5 simultaneously detect the connection between exhaust pipe 6 and connecting pipe 9. When there is a gas leak, detector 5 displays the gas concentration and sounds an alarm to remind staff to close the valve. The operator can determine the approximate location of the leak based on the concentration displayed by detector 5. Pulling the two pull plates 13 causes the locking tongue 24 to slide out of the locking groove 23, allowing the upper clamp 11 and lower clamp 12 to be removed. This enables repair of the pipe connection or replacement of detector 5. The operation is simple and facilitates quick repair and replacement.

Claims

1. A leakage detection device for LNG storage tank for ships, comprising a storage tank body (1), characterized in that: One side of the storage tank body (1) is fixedly connected with an exhaust pipe (6), the control valve (2) is installed on the exhaust pipe (6), and the exhaust pipe (6) is provided with a connecting pipe (9) away from the storage tank body (1); The surface of the exhaust pipe (6) is fixedly connected with a first limiting plate (3), the surface of the connecting pipe (9) is fixedly connected with a second limiting plate (4), the first limiting plate (3) and the second limiting plate (4) are provided with an upper clamp (11), and the surface of the upper clamp (11) is abutted with the exhaust pipe (6) and the connecting pipe (9); the bottom of the upper clamp (11) is provided with a lower clamp (12), and the surface of the lower clamp (12) is abutted with the exhaust pipe (6) and the connecting pipe (9); The bottom of the upper clamp (11) is fixedly connected with an upper fixed seat (7) on both sides, the top of the lower clamp (12) is fixedly connected with a lower fixed seat (8) on both sides at the corresponding position of the upper fixed seat (7), the interiors of the two lower fixed seats (8) are slidably connected with a lock tongue (24), the interiors of the two upper fixed seats (7) are provided with a lock groove (23) at the corresponding positions of the two lock tongues (24), and the lock groove (23) is clamped with the lock tongue (24); one side of the two lock tongues (24) away from the lock groove (23) is fixedly connected with a pull plate (13), and the pull plate (13) is slidably connected with the lower fixed seat (8); one side of the two pull plates (13) away from the lock tongue (24) is fixedly connected with a sliding rod (25), and the sliding rod (25) is slidably connected with the lower fixed seat (8); the two sliding rods (25) are clamped with a locking spring (26) between the two sliding rods (25) and the lower fixed seat (8); the interiors of the upper clamp (11) and the lower clamp (12) are provided with a plurality of detectors (5); The side of the exhaust pipe (6) away from the storage tank body (1) is fixedly connected with a plurality of clamping blocks (18), the interior of the connecting pipe (9) is provided with a limiting groove (17) at the corresponding positions of the plurality of clamping blocks (18), and the limiting groove (17) is slidably connected with the clamping block (18); the interior of the connecting pipe (9) is slidably connected with a plurality of limiting blocks (16), and the surface of the limiting block (16) is abutted with the clamping block (18); one side of the plurality of limiting blocks (16) away from the clamping block (18) is fixedly connected with a pull buckle (14), and the pull buckle (14) is slidably connected with the connecting pipe (9); the plurality of limiting blocks (16) are clamped with a reset spring (15) between the plurality of limiting blocks (16) and the connecting pipe (9).

2. Marine LNG tank leak detection apparatus according to claim 1, characterized in that: The cross section of the upper clamp (11) is a "concave" structure, the cross section of the lower clamp (12) is a "concave" structure, and the cross section of the upper fixed seat (7) is an inverted "L" structure.

3. The marine LNG tank leak detection apparatus of claim 1, wherein: The top side of the lock tongue (24) is an arc structure, and the cross section of the sliding rod (25) is a "T" structure.

4. The marine LNG tank leak detection apparatus of claim 1, wherein: The upper clamp (11) and the lower clamp (12) are fixedly connected with positioning blocks (10), the first limiting plate (3) and the second limiting plate (4) are provided with positioning grooves (19) at the corresponding positions of the positioning blocks (10), and the positioning grooves (19) and the positioning blocks (10) are in sliding connection.

5. Marine LNG tank leak detection apparatus according to claim 4, characterised in that: The cross section of the positioning groove (19) is in "T" shape structure, the cross section of the positioning block (10) is in "T" shape structure, and the size of the positioning block (10) is slightly smaller than the size of the positioning groove (19).

6. The marine LNG tank leak detection apparatus of claim 1, wherein: The cross section of the clamping block (18) is in "L" shape structure, and the top side of the clamping block (18) is in arc structure, one side of the limiting block (16) is in arc structure, and the cross section of the pull buckle (14) is in "T" shape structure.

7. The marine LNG tank leak detection apparatus of claim 1, wherein: The inner side of the exhaust pipe (6) is fixedly connected with a baffle (20), the inner side of the baffle (20) near the connecting pipe (9) is slidably connected with a sealing ring (22), the surface of the sealing ring (22) and the connecting pipe (9) are in abutment, and a plurality of supporting springs (21) are clamped between the sealing ring (22) and the baffle (20).

8. The marine LNG tank leak detection apparatus of claim 7, wherein: The cross section of the sealing ring (22) is in "convex" shape structure, and the baffle (20) is an annular plate.

9. Method of use of a LNG ship tank leak detection device according to any of claims 1 to 8, characterized in that: The following steps are taken: S1, first align the clamping block (18) with the limiting groove (17), and slide the connecting end of the connecting pipe (9) to the inner side of the exhaust pipe (6), in the process of moving, the clamping block (18) extrudes the limiting block (16), the limiting block (16) moves under the force and makes the return spring (15) contract, when the larger end of the clamping block (18) moves to one side of the limiting block (16), the return spring (15) drives the limiting block (16) to reset, so as to realize the clamping and limiting between the clamping block (18) and the limiting block (16), and then realize the installation and fixation of the connecting pipe (9); S2, in the process of installing the connecting pipe (9), the installation end of the connecting pipe (9) extrudes the sealing ring (22), the sealing ring (22) is contracted under the force and makes the supporting spring (21) contract, at the same time, the supporting spring (21) drives the reverse force to drive the sealing ring (22) to tightly abut against the end of the connecting pipe (9), which can further enhance the sealing performance of the connection between the connecting pipe (9) and the exhaust pipe (6); S3, then respectively slide the upper clamp (11) and the lower clamp (12) into the positioning groove (19) between the first limiting plate (3) and the second limiting plate (4) according to the positioning blocks (10) on both sides, and then relatively extrude the upper clamp (11) and the lower clamp (12), and slide the lower fixed seat (8) to the inner side of the upper fixed seat (7), in the process of sliding, the lock tongue (24) is forced and drives the pull plate (13) and the slide rod (25) to make the locking spring (26) contract, when the lock tongue (24) corresponds to the lock groove (23), the locking spring (26) drives the lock tongue (24) to reset through the slide rod (25) and the pull plate (13), so that the lock tongue (24) and the lock groove (23) are clamped, thereby realizing the installation and fixation of the upper clamp (11) and the lower clamp (12), and then realizing the installation of the detector (5). S4, after installation, open the control valve (2), the gas in the storage tank body (1) is discharged, in the process of use, a plurality of detectors (5) simultaneously detect the connecting part of the exhaust pipe (6) and the connecting pipe (9), when there is gas leakage, the detector (5) displays the gas concentration and sends out the alarm, reminds the staff to close the valve, the operator can determine the approximate position of the leakage according to the concentration displayed by the detector (5).

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