Liquefied natural gas (LNG) pump pool liquid level detection device

Abstract

The utility model discloses an LNG pump pool liquid level detection device, and particularly relates to the technical field of liquid level detection, the LNG pump pool liquid level detection device comprises a pump pool, a protection box is arranged on one side of the top of the pump pool, a columnar shell is fixedly connected to the side, away from the pump pool, of the protection box, and an opening is formed in the lower portion of the columnar shell; sealing plates matched with the opening are arranged on the two sides of the opening in the columnar shell, a low-temperature air cylinder is fixedly connected to the side, close to the pump pool, in the protection box, and the output end of the low-temperature air cylinder is fixedly connected with a radar position finder used for detecting the height of the liquid level in the pump pool. Through cooperation of the pump pool, the protection box, the columnar shell, the opening, the sealing plate, the low-temperature air cylinder, the radar level finder and the servo liquid level meter, the high liquid level and the low liquid level in the pump pool are measured separately through the two different liquid level meters, and then the situation that the service life of a single liquid level meter is shortened after the single liquid level meter is soaked in LNG for a long time is avoided as much as possible; meanwhile, the measurement result deviates.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level detection, and more specifically, to an LNG pump pool liquid level detection device. Background Art

[0002] In the storage and transportation system of liquefied natural gas (LNG), the pump pool is a key component, and accurate monitoring of its liquid level is crucial to ensure the safe and efficient operation of the system.

[0003] Due to the ultra-low temperature characteristics of LNG itself, the liquid level monitoring equipment of the LNG pump pool generally needs to have a liquid level gauge with good low-temperature resistance to monitor the liquid level in the pump pool during use. However, the traditional liquid level monitoring method often uses a single liquid level gauge. Regardless of the type of liquid level gauge, its service life will be greatly reduced after being immersed in LNG for a long time, and it may also cause deviations in the measurement results. Utility Model Content

[0004] In order to overcome the problems and defects in the prior art, the present invention provides an LNG pump pool liquid level detection device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: an LNG pump pool liquid level detection device, comprising a pump pool, a protective box provided on one side of the top of the pump pool, a cylindrical housing fixedly connected to the side of the protective box away from the pump pool, an opening being provided below the cylindrical housing, and sealing plates adapted to the opening being provided on both sides of the opening in the cylindrical housing;

[0006] A low-temperature cylinder is fixedly connected to one side of the protective box near the pump pool, and a radar position meter for detecting the liquid level in the pump pool is fixedly connected to the output end of the low-temperature cylinder;

[0007] The cylindrical housing is provided with a linkage drive assembly for driving the two sealing plates away from the opening when the low-temperature cylinder drives the radar position finder to move away from the low-temperature cylinder, and for driving the two sealing plates to close the opening when the low-temperature cylinder drives the radar position finder to move toward the low-temperature cylinder.

[0008] A servo level gauge is provided on the side of the top of the pump pool away from the protection box.

[0009] Preferably, the linkage drive assembly includes a slide groove opened in the cylindrical shell, and sliders adapted to the slide groove are fixedly connected to both sides of the outer wall of the sealing plate, and connecting plates are fixedly connected to both sides of the output end of the low-temperature cylinder, and the end of the connecting plate away from the low-temperature cylinder is fixedly connected to a vertical rack, and gears meshing with the vertical rack are provided on the upper and lower sides of the inner wall of the cylindrical shell, and an arc-shaped rack meshing with the gear is fixedly connected to the side of the sealing plate close to the gear.

[0010] Preferably, a first sealing groove is formed on a side of one of the sealing plates close to the opening, and a first sealing strip adapted to the first sealing groove is fixedly connected to a side of the other sealing plate close to the first sealing groove.

[0011] Preferably, second sealing grooves are provided on both sides of the columnar housing close to the sealing plate, and second sealing strips adapted to the second sealing grooves are fixedly connected to both sides of the outer side wall of the sealing plate.

[0012] Preferably, sealing gaskets are provided in both the first sealing groove and the second sealing groove.

[0013] Preferably, the lowest height of the float of the servo level gauge is lower than the lowest height of the radar level gauge.

[0014] The technical effects and advantages of this utility model are:

[0015] Through the cooperation of the pump pool, protective box, cylindrical housing, opening, sealing plate, cryogenic cylinder, radar level gauge and servo level gauge, when the liquid level in the pump pool is not high enough to contact the float of the servo level gauge, the cryogenic cylinder drives the radar level gauge to move downward to open the opening, and the output end of the cryogenic cylinder drives the measuring head of the radar level gauge to completely protrude from the cylindrical housing through the opening. At this time, the radar level gauge directly measures the liquid level in the pump pool. When the liquid level in the pump pool reaches the lowest position of the float of the servo level gauge and the float is subjected to buoyancy, the cryogenic cylinder drives the radar level gauge to move upward and the opening is sealed. At this time, the liquid level in the pump pool is measured by the servo level gauge, and the high and low liquid levels in the pump pool are measured separately by two different level gauges, thereby avoiding as much as possible the reduction in the service life of a single level gauge after being immersed in LNG for a long time, and at the same time avoiding deviations in the measurement results.

[0016] Through the cooperation of the columnar housing, opening, sealing plate, low-temperature cylinder, slide groove, slider, connecting plate, vertical rack, gear and arc-shaped rack, when the low-temperature cylinder drives the radar position meter to move downward, the vertical rack moves downward synchronously and drives the gear to rotate, and then the gear drives the arc-shaped rack and the sealing plate to move to the side away from the opening to open the opening. When the low-temperature cylinder drives the radar position meter to move upward, the vertical rack moves upward synchronously and drives the gear to rotate, and then the gear drives the arc-shaped rack and the sealing plate to move to the side of the opening at the same time until the two sealing plates abut each other to seal the opening. Then, the opening can be opened and closed while controlling the lifting and lowering of the radar position meter through a single power source. This continuous control can simplify the control system as much as possible, thereby ensuring the reliability and stability of the device as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the columnar shell of the utility model;

[0019] Figure 3 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0020] Figure 4 This is a schematic diagram of the main cross-sectional structure of the cylindrical housing of the present invention;

[0021] Figure 5 This is a schematic side sectional structural diagram of the columnar housing of the present invention.

[0022] The accompanying drawings are marked as follows: 1. Pump pool; 2. Protective box; 3. Columnar shell; 4. Opening; 5. Sealing plate; 6. Low-temperature cylinder; 7. Radar position meter; 8. Servo liquid level meter; 9. Slide; 10. Slider; 11. Connecting plate; 12. Vertical rack; 13. Gear; 14. Arc rack; 15. First sealing groove; 16. First sealing strip; 17. Second sealing groove; 18. Second sealing strip; 19. Sealing gasket. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] As attached Figure 1-5The LNG pump pool liquid level detection device shown includes a pump pool 1. A protective box 2 is provided on one side of the top of the pump pool 1. A cylindrical housing 3 is fixedly connected to the side of the protective box 2 away from the pump pool 1. An opening 4 is formed below the cylindrical housing 3. Sealing plates 5 that are compatible with the opening are provided on both sides of the opening in the cylindrical housing 3.

[0025] A low-temperature cylinder 6 is fixedly connected to one side of the protective box 2 near the pump pool 1. The output end of the low-temperature cylinder 6 is fixedly connected to a radar position meter 7 for detecting the liquid level in the pump pool 1. The detection head of the radar position meter 7 faces the bottom of the pump pool 1.

[0026] A linkage drive assembly is provided in the cylindrical housing 3 for driving the two sealing plates 5 away from the opening 4 when the low-temperature cylinder 6 drives the radar position meter 7 to move away from the low-temperature cylinder 6, and for driving the two sealing plates 5 to close the opening 4 when the low-temperature cylinder 6 drives the radar position meter 7 to move toward the low-temperature cylinder 6.

[0027] The linkage drive assembly includes a slide groove 9 opened in the cylindrical shell 3, and sliders 10 adapted to the slide groove 9 are fixedly connected to both sides of the outer wall of the sealing plate 5. Both sides of the output end of the low-temperature cylinder 6 are fixedly connected to a connecting plate 11. The end of the connecting plate 11 away from the low-temperature cylinder 6 is fixedly connected to a vertical rack 12. The upper and lower sides of the inner wall of the cylindrical shell 3 are provided with a gear 13 meshing with the vertical rack 12. The side of the sealing plate 5 close to the gear 13 is fixedly connected to an arc-shaped rack 14 meshing with the gear 13. One of the sealing plates 5 is close to the gear 13. A first sealing groove 15 is provided on one side of the opening 4, and a first sealing strip 16 adapted to the first sealing groove 15 is fixedly connected to one side of the other sealing plate 5 near the first sealing groove 15. A second sealing groove 17 is provided on both sides of the cylindrical housing 3 near the sealing plate 5, and a second sealing strip 18 adapted to the second sealing groove 17 is fixedly connected on both sides of the outer wall of the sealing plate 5. When the low-temperature cylinder 6 drives the radar position meter 7 to move downward, the connecting block 11 and the vertical rack 12 fixedly connected to the connecting block 11 move downward synchronously, thereby driving The gear 13 rotates, and drives the arc-shaped rack 14 and the sealing plate 5 to move away from the opening 4 through the gear 13, and at the same time the opening 4 is opened, the radar position meter 7 is protruded from the opening 4 to detect the liquid level in the pump pool 1. When the low-temperature cylinder 6 drives the radar position meter 7 to move upward, the connecting block 11 and the vertical rack 12 fixedly connected to the connecting block 11 are driven to move upward, thereby driving the gear 13 to rotate, and the gear 13 drives the arc-shaped rack 14 and the sealing plate 5 to move toward the side of the opening 4 at the same time, until the two sealing plates 5 are mutually Abut, and the first sealing strip 16 is inserted into the first sealing groove 15 to seal the opening 4. At the same time, the second sealing strip 18 is inserted into the second sealing groove 17 to seal the sealing plate 5 and the columnar shell 3. The first sealing groove 15 and the second sealing groove 17 are both provided with sealing gaskets 19. The sealing gasket 19 is a polytetrafluoroethylene sealing gasket. When the first sealing strip 16 is inserted into the first sealing groove 15 and the second sealing strip 18 is inserted into the second sealing groove 17, they both abut the sealing gasket 19. Polytetrafluoroethylene has extremely excellent low-temperature resistance. At an ultra-low temperature of -162 degrees Celsius, it can still maintain good flexibility and elasticity, and will not have problems such as embrittlement and breakage. Its molecular structure is stable and can effectively resist the effects of low temperatures to ensure that the sealing performance is not damaged. At the same time, the smooth surface makes it not easy to stick at such low temperatures, which is convenient for installation and disassembly, and can further enhance the sealing effect of the sealing plate 5 when closing the opening 4;

[0028] A servo level gauge 8 is provided on the side of the top of the pump pool 1 away from the protective box 2. The servo level gauge 8 and the low-temperature cylinder 6 are electrically connected to the control panel (not shown in the figure). The protective box 2 and the servo level gauge 8 are fixed to the pump pool 1 through mounting flanges. The lowest height of the float of the servo level gauge 8 is lower than the lowest height of the radar position meter 7. At the same time, when the low-temperature cylinder 6 drives the radar position meter 7 back into the cylindrical housing 3 and the sealing plate 5 seals the opening 4, the servo level gauge 8 can still measure the liquid level in the pump pool 1.

[0029] The working principle of the utility model is as follows: during use, when the liquid level in the pump pool 1 is not high enough to contact the float of the servo level gauge 8, the cryogenic cylinder 6 drives the radar position meter 7 to move downward, and the connecting block 11 and the vertical rack 12 fixedly connected to the connecting block 11 move downward synchronously, thereby driving the gear 13 to rotate, and the gear 13 drives the arc-shaped rack 14 and the sealing plate 5 to move away from the opening 4, so that the opening 4 is opened. The output end of the cryogenic cylinder 6 drives the measuring head of the radar position meter 7 to completely protrude from the cylindrical housing 3 through the opening 4. At this time, the radar position meter 7 directly measures the liquid level in the pump pool 1;

[0030] When the liquid level in the pump pool 1 continues to rise, when the liquid level reaches the lowest position of the float of the servo level gauge 8 and the float is subjected to buoyancy, the low-temperature cylinder 6 drives the radar position meter 7 to move upward, drives the connecting block 11 and the vertical rack 12 fixedly connected to the connecting block 11 to move upward, and then drives the gear 13 to rotate, and drives the arc-shaped rack 14 and the sealing plate 5 to move toward the side of the opening 4 at the same time through the gear 13, until the two sealing plates 5 abut each other, and the first sealing strip 16 is inserted into the first sealing groove 15 to seal the opening 4, and at the same time, the second sealing strip 18 is inserted into the second sealing groove 17 to seal between the sealing plate 5 and the cylindrical housing 3. At this time, the liquid level in the pump pool 1 is measured by the servo level gauge 8;

[0031] When the liquid level in the pump pool 1 drops back below the float of the servo level gauge 8, the output end of the cryogenic cylinder 6 drives the measuring head of the radar position meter 7 to descend again, opens the opening 4, and then projects out from the cylindrical housing 3 through the opening 4 to measure the liquid level in the pump pool 1.

[0032] Finally, the above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by persons skilled in the art without departing from the spirit and technical concepts disclosed in this utility model are intended to be covered by the claims of this utility model.

Claims

1. An LNG pump pool liquid level detection device, comprising a pump pool (1), characterized in that: A protective box (2) is provided on one side of the top of the pump pool (1), a columnar housing (3) is fixedly connected to the side of the protective box (2) away from the pump pool (1), an opening (4) is provided below the columnar housing (3), and sealing plates (5) adapted to the opening are provided on both sides of the opening in the columnar housing (3); A low-temperature cylinder (6) is fixedly connected to one side of the protective box (2) close to the pump pool (1), and a radar position meter (7) for detecting the liquid level in the pump pool (1) is fixedly connected to the output end of the low-temperature cylinder (6); The columnar housing (3) is provided with a linkage drive assembly for driving the two sealing plates (5) away from the opening (4) when the low-temperature cylinder (6) drives the radar position meter (7) to move away from the low-temperature cylinder (6), and for driving the two sealing plates (5) to close the opening (4) when the low-temperature cylinder (6) drives the radar position meter (7) to move toward the low-temperature cylinder (6); A servo level gauge (8) is provided on the top of the pump pool (1) on a side away from the protection box (2).

2. The LNG pump pool liquid level detection device according to claim 1, characterized in that: The linkage drive assembly includes a slide groove (9) provided in the cylindrical housing (3), sliders (10) adapted to the slide groove (9) are fixedly connected to both sides of the outer wall of the sealing plate (5), connecting plates (11) are fixedly connected to both sides of the output end of the low-temperature cylinder (6), a vertical rack (12) is fixedly connected to one end of the connecting plate (11) away from the low-temperature cylinder (6), gears (13) meshing with the vertical rack (12) are provided on the upper and lower sides of the inner wall of the cylindrical housing (3), and an arc-shaped rack (14) meshing with the gear (13) is fixedly connected to the side of the sealing plate (5) close to the gear (13).

3. The LNG pump pool liquid level detection device according to claim 1, characterized in that: A first sealing groove (15) is formed on one side of the sealing plates (5) close to the opening (4), and a first sealing strip (16) adapted to the first sealing groove (15) is fixedly connected to the other side of the sealing plates (5) close to the first sealing groove (15).

4. The LNG pump pool liquid level detection device according to claim 1, characterized in that: Second sealing grooves (17) are provided on both sides of the columnar housing (3) near the sealing plate (5), and second sealing strips (18) adapted to the second sealing grooves (17) are fixedly connected to both sides of the outer wall of the sealing plate (5).

5. The LNG pump pool liquid level detection device according to claim 3, characterized in that: Sealing gaskets (19) are provided in both the first sealing groove (15) and the second sealing groove (17).

6. The LNG pump pool liquid level detection device according to claim 1, characterized in that: The lowest height of the float of the servo level gauge (8) is lower than the lowest height of the radar position gauge (7).

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