A leakage-preventing early warning device for LNG ship filling

Abstract

The application discloses a kind of liquefied natural gas ship filling leak-proof early warning device;Including sleeve, connecting hose and pipe clamp, leak-proof early warning mechanism is arranged at the top of sleeve, it includes air inlet channel, gas storage tank is arranged at the top of air inlet channel, recess is opened in the inner bottom of gas storage tank, exhaust pipe is arranged at the bottom of gas storage tank, first moving plate is slidably connected in gas storage tank, and the first moving plate is arranged on trigger switch.In the application, when liquefied natural gas filling valve leaks, natural gas diffuses into connecting hose, more natural gas enters gas storage tank, trigger switch pops up automatically, and warning light is bright, to prompt the leakage condition;In addition, when the leaked natural gas enters the gas storage tank, the first moving plate moves upward, drives the fan to rotate, and the wind blows upward in the flow channel, which guides the second moving plate to move upward, so as to understand the rotation speed of the fan, and thus understand the degree of natural gas leakage.

Description

Technical Field

[0001] This invention belongs to the field of marine technology and relates to a leak prevention and early warning device for liquefied natural gas (LNG) ship refueling. Background Technology

[0002] As a clean energy source, liquefied natural gas (LNG) has become the best choice for the water transport industry to achieve energy conservation and emission reduction, develop green transportation, and build an ecological civilization. Using LNG as fuel has become the mainstream development trend in the shipping industry.

[0003] Bunkering is a crucial link in the liquefied natural gas (LNG) supply chain. Before filling LNG into the storage tanks of LNG-powered ships, the bunkering hose must be connected to the ship's LNG receiving pipeline. If the valve at the connection point is not airtight, LNG will leak and immediately flash into gas. If not detected and remedied in time, this can easily lead to fire and explosion hazards, creating a safety risk. Therefore, there is an urgent need to improve existing equipment to address potential leaks during bunkering. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a leak prevention and early warning device for liquefied natural gas (LNG) ship refueling, thereby solving the problem of poor airtightness at the connection between the refueling hose and the ship's LNG receiving pipeline, resulting in LNG leaks that are difficult to detect and handle in a timely manner, leading to poor safety performance.

[0005] The technical solution of the present invention is as follows: The present invention provides a leak prevention and early warning device for liquefied natural gas ship refueling, comprising a casing (1), a connecting hose (2) and a pipe clamp (3). Both ends of the casing (1) are connected to the pipe clamp (3) through the installed connecting hose (2). A leak warning mechanism (4) is fixedly installed on the top of the casing (1).

[0006] Furthermore, the leakage warning mechanism (4) includes an air intake channel (401), a gas storage tank (405) is fixedly installed at the top of the air intake channel (401), a groove (406) is provided at the bottom of the gas storage tank (405), and a trigger switch (407) is fixedly installed in the groove (406).

[0007] An exhaust pipe (409) is fixedly installed at the bottom of the gas storage tank (405), an indicator light (413) is fixedly installed on the front side of the gas storage tank (405), and a first movable plate (415) is slidably connected inside the gas storage tank (405). The first movable plate (415) is installed on a trigger switch (407).

[0008] A rotary valve (402) is rotatably connected to the inner wall of the air intake passage (401), and the rotary valve (402) is connected to the air intake passage (401) via a spiral spring (403).

[0009] A pad (404) is also fixedly installed on the inner wall of the air intake channel (401).

[0010] The rotary valve (402) is mounted on the pad (404); when the liquefied natural gas leaks and flashes into gas, filling the two connecting hoses (2), the rotary valve (402) automatically opens, and the natural gas enters the intake channel.

[0011] Furthermore, a first through hole (408) is provided at the bottom of the gas storage tank (405), and a first support plate (4101) is fixedly installed in the first through hole (408). A first compression spring (4102) and a first plug (4103) are installed on one side of the first support plate (4101). One side of the first support plate (4101) is connected to the first plug (4103) through the first compression spring (4102). When natural gas enters the first gas inlet channel, the first plug (4103) moves upward to open the first through hole (408) so that gas enters the gas storage tank (405).

[0012] Furthermore, a second through hole (412) is provided at the bottom of the gas storage tank (405). The second through hole (412) connects the gas storage tank (405) and the exhaust pipe (409). A second support plate (4111) is fixedly installed inside the exhaust pipe (409). A second compression spring (4112) and a second plug (4113) are installed on one side of the second support plate (4111).

[0013] One side of the second support plate (4111) is connected to the second plug (4113) via the second compression spring (4112). When it is necessary to discharge the natural gas in the gas storage tank (405), the second plug (4113) moves downward to open the second through hole (412) so that the gas enters the exhaust pipe (409).

[0014] The exhaust pipe (409) is connected to a recovery device for recovering leaked natural gas.

[0015] Furthermore, a lead screw (414) is rotatably connected inside the gas storage tank (405). The first moving plate (415) is threadedly connected to the outside of the lead screw (414). When the first moving plate (415) moves up and down, it will drive the lead screw (414) to rotate, so that the air intake channel is connected to the gas storage tank (405).

[0016] Furthermore, it also includes a belt drive assembly (416) and a first gear (417);

[0017] The lead screw (414) passes through the top of the gas storage tank (405) and is connected to the belt drive assembly (416), and a fan (423) is fixedly installed on the top of the belt drive assembly (416).

[0018] The output end of the belt drive assembly (416) is connected to the first gear (417), and the first gear (417) is rotatably connected to the top of the gas storage tank (405); the operation of the belt drive assembly (416) can drive the fan (423) to rotate, which facilitates the upward movement of the second moving plate (4245).

[0019] Furthermore, a rotating ring (418) is rotatably connected to the top of the gas storage tank (405), and an internal gear ring (419) is fixedly installed on the inner wall of the rotating ring (418). An external gear ring (420) is fixed on the outer wall of the rotating ring (418). The internal gear ring (419) is meshed with the outer side of the first gear (417). The rotation of the first gear (417) will drive the rotating ring (418) to rotate.

[0020] Furthermore, a motor (421) is fixedly mounted on one side of the gas storage tank (405), and a second gear (422) is mounted on the top of the motor (421). The top of the motor (421) is connected to the second gear (422), and the external gear ring (420) is meshed with one side of the second gear (422). The rotation of the second gear (422) will drive the rotating ring (418) to rotate.

[0021] Furthermore, a leakage level indication mechanism (424) is also fixedly installed on the top of the gas storage tank (405).

[0022] The leakage level indication mechanism (424) includes a support cylinder (4241), an opening (4242) is provided on the side of the support cylinder (4241), and an exhaust hole (4243) is provided on the top of the support cylinder (4241); when the fan (423) rotates, the second moving plate (4245) moves upward, and the air is finally discharged through the exhaust hole (4243).

[0023] Furthermore, a third compression spring (4244) and a second moving plate (4245) are arranged on the lower side of the top inside the support cylinder (4241). The lower side of the top inside the support cylinder (4241) is connected to the second moving plate (4245) through the third compression spring (4244), and a guide channel (4246) is provided on the second moving plate (4245).

[0024] A movable column (4247) is fixedly installed on the top of the second movable plate (4245), and the movable column (4247) penetrates the top of the support cylinder (4241);

[0025] A scale (4248) is also fixedly provided on the outside of the movable column (4247);

[0026] The upward movement of the second moving plate (4245) will cause the moving column (4247) to move upward. By observing the scale (4248), the wind speed can be determined, thereby understanding the degree of natural gas leakage.

[0027] The beneficial effects of this invention are: 1. The leak prevention and early warning device for LNG carrier refueling can effectively indicate leaks. The device is fixed at the connection between the refueling hose and the ship's LNG receiving pipeline. If a valve leaks during LNG refueling, the evaporated natural gas will diffuse into the connecting hose, and more natural gas will enter the storage tank through the intake channel. The first moving plate will move upwards and away from the trigger switch, which will automatically pop up, and the indicator light will automatically illuminate, thus alerting people to the leak. 2. The leak prevention and early warning device for LNG carrier refueling can effectively indicate the degree of leak. Leaking natural gas enters the storage tank, causing the first moving plate to move upwards. This rotates the lead screw, the belt drive assembly, and the fan, causing air to blow upwards in the guide channel, guiding the second moving plate upwards. By observing the scale, the extension length of the moving column can be determined, thus indicating the fan's rotation speed and the degree of natural gas leakage. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a cross-sectional view of the present invention;

[0030] Figure 3 This is a schematic diagram of the leakage early warning mechanism in this invention;

[0031] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0032] Figure 5 This is a schematic diagram of the leakage level indication mechanism in this invention;

[0033] Figure 6 This is a schematic diagram of the connection structure of the third compression spring, the second moving plate, the flow guide channel, the moving column, and the scale in this invention;

[0034] In the diagram: 1. Sleeve; 2. Connecting hose; 3. Pipe clamp; 4. Leakage warning mechanism; 401. Air inlet channel; 402. Rotary valve; 403. Scroll spring; 404. Pad; 405. Air tank; 406. Groove; 407. Trigger switch; 408. First through hole; 409. Exhaust pipe; 4101. First support plate; 4102. First compression spring; 4103. First plug; 4111. Second support plate; 4112. Second compression spring; 4113. Second plug; 412. Second through hole; 4 13. Indicator light; 414. Lead screw; 415. First moving plate; 416. Belt drive assembly; 417. First gear; 418. Rotary ring; 419. Internal gear ring; 420. External gear ring; 421. Motor; 422. Second gear; 423. Fan; 424. Leakage level indication mechanism; 4241. Support cylinder; 4242. Opening; 4243. Exhaust port; 4244. Third compression spring; 4245. Second moving plate; 4246. Guide channel; 4247. Moving column; 4248. Scale. Detailed Implementation

[0035] The specific technical solution of the present invention will be further described in detail below with reference to specific examples.

[0036] As shown in the figure, the present invention provides a leak prevention and early warning device for liquefied natural gas (LNG) ship refueling, including a sleeve 1, a connecting hose 2 and a hose clamp 3. A leak warning mechanism 4 is fixedly installed on the top of the sleeve 1. The leak warning mechanism 4 includes an air inlet channel 401. A gas storage tank 405 is fixedly installed on the top of the air inlet channel 401. A groove 406 is formed in the bottom of the gas storage tank 405. A trigger switch 407 is fixedly installed in the groove 406. An exhaust pipe 409 is fixedly installed at the bottom of the gas storage tank 405. An indicator light 413 is fixedly installed on the front side of the gas storage tank 405. A first moving plate 415 is slidably connected in the gas storage tank 405. The first moving plate 415 is mounted on the trigger switch 407.

[0037] A rotary valve 402 is rotatably connected to the inner wall of one location of the air intake channel 401, and the rotary valve 402 is connected to the air intake channel 401 via a spiral spring 403. A pad 404 is fixedly installed on the inner wall of the other location of the air intake channel 401, and the rotary valve 402 is installed on the pad 404. After the filling hose is connected to the ship's liquefied natural gas receiving pipeline, the sleeve 1 can be fixedly installed at the connection point using the connecting hose 2 and the pipe clamp 3. If a leak occurs, the natural gas will first diffuse into the connecting hose 2, and more natural gas will cause the rotary valve 402 to open automatically, and the natural gas will enter the air intake channel 401.

[0038] A first through hole 408 is provided at the bottom of the gas storage tank 405 to connect the gas storage tank 405 with the air inlet channel 401. A first support plate 4101 is fixedly installed in the first through hole 408. A first compression spring 4102 is connected to a first plug 4132 on one side of the first support plate 4101. When the leaked natural gas enters the air inlet channel 401, the first plug 4103 moves upward under the action of air pressure, thereby opening the first through hole 408 and allowing gas to enter the gas storage tank 405.

[0039] A second through hole 412 is provided at the bottom of the gas storage tank 405 to connect the gas storage tank 405 and the exhaust pipe 409. A second support plate 4111 is fixedly installed in the exhaust pipe 409. One side of the second support plate 4111 is connected to a second plug 4113 through a second compression spring 4112. When it is necessary to discharge the natural gas in the gas storage tank 405, the second plug 4113 moves downward under the action of air pressure, thereby opening the second through hole 409 and allowing gas to enter the exhaust pipe 409. The exhaust pipe 409 is connected to a recovery device for easy recovery of natural gas.

[0040] A lead screw 414 is rotatably connected inside the gas storage tank 405. The first moving plate 415 is threadedly connected to the outside of the lead screw 414. When the first moving plate 415 moves upward, it will drive the lead screw 414 to rotate.

[0041] The lead screw 414 passes through the top of the gas storage tank 405 and is connected to the belt drive assembly 416. A fan 423 is fixedly installed on the top of the belt drive assembly 416. The output end of the belt drive assembly 416 is connected to the first gear 417, and the first gear 417 is rotatably connected to the top of the gas storage tank 405. The rotation of the lead screw 414 can drive the belt drive assembly 416 to operate, thereby driving the fan 423 to rotate. The fan 423 can blow air upwards.

[0042] A rotating ring 418 is rotatably connected to the top of the gas storage tank 405, and an internal gear ring 419 is fixedly installed on the inner wall of the rotating ring 418. An external gear ring 420 is fixedly installed on the outer wall of the rotating ring 418. The internal gear ring 419 is meshed with the outer side of the first gear 417. Since the first gear 417 and the internal gear ring 419 are meshed together, the rotation of the first gear 417 will drive the rotating ring 418 to rotate.

[0043] A motor 421 is fixedly mounted on one side of the gas storage tank 405, and a second gear 422 is connected to the top of the motor 421. The external gear ring 420 is meshed with one side of the second gear 422. The second gear 422 can rotate under the action of the motor 421. Since the external gear ring 420 is meshed with the second gear 422, the rotation of the second gear 422 will drive the rotating ring 418 to rotate, thereby driving the first gear 417, the belt drive assembly 416 and the lead screw 414 to rotate.

[0044] After the airtight maintenance operation is completed, the second gear 422 rotates forward, the lead screw 414 rotates forward, and the first moving plate 415 continues to move upward, completely pumping the natural gas in the connecting hose 2 into the gas storage tank 405. Then the second gear 422 reverses, the lead screw 414 reverses, and the first moving plate 415 moves downward, forcing the natural gas in the gas storage tank 405 into the exhaust pipe 409.

[0045] A leakage level indicator 424 is fixedly installed on the top of the gas storage tank 405. The leakage level indicator 424 includes a support cylinder 4241. An opening 4242 is provided on the side of the support cylinder 4241, and an exhaust hole 4243 is provided on the top of the support cylinder 4241. When the fan 423 rotates, the second moving plate 4245 will move upward under the action of air pressure, and the air can be discharged through the guide channel 4246 and the exhaust hole 4243.

[0046] The second moving plate 4245 is connected to the lower side of the top of the support cylinder 4241 by a third compression spring 4244. A guide channel 4246 is provided on the second moving plate 4245. A moving column 4247 is fixedly installed on the top of the second moving plate 4245 and penetrates the top of the support cylinder 4241. A scale 4248 is fixedly provided on the outer side of the moving column 4247. The rotation of the fan 423 will guide the second moving plate 4245 to move upward, thereby driving the moving column 4247 to move upward. By observing the scale 4248, the extension length of the moving column 4247 can be known, thereby knowing the rotation speed of the fan 423, and thus knowing the leakage of natural gas.

[0047] The working process of the leak prevention and early warning device for liquefied natural gas (LNG) ship bunkering is as follows:

[0048] First, place the sleeve on the outside of the refueling hose. After connecting the refueling hose to the ship's liquefied natural gas receiving pipeline, use the connecting hose 2 and the clamp 3 to fix the sleeve 1 at the connection point.

[0049] If a leak occurs at the connection during the refueling process, the liquefied natural gas will immediately evaporate into gas and spread everywhere. After the connecting hose 2 is filled with gas, the excess natural gas will enter the air intake channel 401, the rotary valve 402 will open automatically, and the first plug 4103 in the first through hole 408 will move upward under the action of gas pressure to open the first through hole 408. The gas will enter the gas storage tank 405 and push the first moving plate 415 upward. After the first moving plate 415 leaves the trigger switch 407, the trigger switch 407 will automatically pop up, and the indicator light 413 will automatically light up to indicate that a leak has occurred.

[0050] The first moving plate 415 moves upward, causing the lead screw 414 to rotate, which in turn drives the belt drive assembly 416 and the fan 423 to rotate. The fan 423 blows air upward. The second moving plate 4245 and the moving column 4247 move upward. By observing the scale 4248, the extension length of the moving column 4247 can be determined, thereby determining the rotation speed of the fan 423 and thus the degree of natural gas leakage.

[0051] After the airtight maintenance operation is completed, the second gear 422 rotates, thereby driving the rotating ring 418 to rotate, which in turn drives the first gear 417, belt drive assembly 416 and lead screw 414 to rotate. The first moving plate 415 continues to move upward, thereby completely drawing the gas in the connecting hose 2 into the gas storage tank 405. Then the second gear 422 reverses, the first moving plate 415 moves downward, and the second plug 4113 in the exhaust pipe 409 automatically opens, and the leaked natural gas is discharged through the exhaust pipe 409.

[0052] Exhaust pipe 409 is connected to a recovery device used to recover leaked natural gas.

Claims

1. A leak prevention and early warning device for liquefied natural gas (LNG) ship refueling, comprising a casing (1), a connecting hose (2), and a hose clamp (3), characterized in that: Both ends of the sleeve (1) are connected to the pipe clamp (3) through the installed connecting hose (2), and a leakage warning mechanism (4) is fixedly installed on the top of the sleeve (1). The leakage warning mechanism (4) includes an air intake channel (401), a gas storage tank (405) is fixedly installed at the top of the air intake channel (401), a groove (406) is provided at the bottom of the gas storage tank (405), and a trigger switch (407) is fixedly installed in the groove (406). An exhaust pipe (409) is fixedly installed at the bottom of the gas storage tank (405), an indicator light (413) is fixedly installed on the front side of the gas storage tank (405), and a first movable plate (415) is slidably connected inside the gas storage tank (405). The first movable plate (415) is installed on the trigger switch (407). A rotary valve (402) is rotatably connected to the inner wall of the air intake passage (401), and the rotary valve (402) is connected to the air intake passage (401) via a spiral spring (403). A pad (404) is also fixedly installed on the inner wall of the air intake channel (401). The rotary valve (402) is mounted on the pad (404); A lead screw (414) is rotatably connected inside the gas storage tank (405), and the first moving plate (415) is threaded to the outside of the lead screw (414); It also includes a belt drive assembly (416) and a first gear (417). The lead screw (414) passes through the top of the gas storage tank (405) and is connected to the belt drive assembly (416), and a fan (423) is fixedly installed on the top of the belt drive assembly (416). The output end of the belt drive assembly (416) is connected to the first gear (417), and the first gear (417) is rotatably connected to the top of the gas storage tank (405); A rotating ring (418) is rotatably connected to the top of the gas storage tank (405), and an internal gear ring (419) is fixedly installed on the inner wall of the rotating ring (418), and an external gear ring (420) is fixed on the outer wall of the rotating ring (418). The internal gear ring (419) is meshed with the outer side of the first gear (417). A motor (421) is fixedly mounted on one side of the gas storage tank (405), and a second gear (422) is mounted on the top of the motor (421). The top of the motor (421) is connected to the second gear (422), and the external gear ring (420) is meshed with one side of the second gear (422).

2. The leak prevention and early warning device for liquefied natural gas (LNG) ship bunkering as described in claim 1, characterized in that: A first through hole (408) is provided at the bottom of the gas storage tank (405), and a first support plate (4101) is fixedly installed in the first through hole (408). A first compression spring (4102) and a first plug (4103) are installed on one side of the first support plate (4101). One side of the first support plate (4101) is connected to the first plug (4103) through the first compression spring (4102).

3. The leak prevention and early warning device for liquefied natural gas (LNG) ship bunkering as described in claim 1, characterized in that: A second through hole (412) is provided at the bottom of the gas storage tank (405). One end of the second through hole (412) is connected to the gas storage tank (405), and the other end is connected to an exhaust pipe (409). A second support plate (4111) is fixedly installed in the exhaust pipe (409). A second compression spring (4112) and a second plug (4113) are installed on one side of the second support plate (4111). One side of the second support plate (4111) is connected to the second plug (4113) via the second compression spring (4112).

4. A leak prevention and early warning device for liquefied natural gas (LNG) ship bunkering as described in claim 1, characterized in that: A leakage level indicator (424) is also fixedly installed on the top of the gas storage tank (405). The leakage level indication mechanism (424) includes a support cylinder (4241), an opening (4242) is provided on the side of the support cylinder (4241), and an exhaust hole (4243) is provided on the top of the support cylinder (4241).

5. A leak prevention and early warning device for liquefied natural gas (LNG) ship bunkering according to claim 4, characterized in that: A third compression spring (4244) and a second moving plate (4245) are arranged on the lower side of the top of the support cylinder (4241). The lower side of the top of the support cylinder (4241) is connected to the second moving plate (4245) through the third compression spring (4244), and a guide channel (4246) is provided on the second moving plate (4245). A movable column (4247) is fixedly installed on the top of the second movable plate (4245), and the movable column (4247) penetrates the top of the support cylinder (4241); A scale (4248) is also fixedly provided on the outside of the movable column (4247).

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