An automatic pressure regulating device for providing LNG fuel

Abstract

The present invention discloses an automatic pressure regulating device for providing LNG fuel, comprising a base, a mounting seat fixedly connected to the bottom end of the base, a mounting plate fixedly connected to the base, a support frame fixedly connected to the mounting plate, a storage tank fixedly mounted on the support frame, a pressure sensor fixedly mounted on the top end of the storage tank, a first pipe fixedly connected to one side of the storage tank, a second pipe fixedly connected to one side of the storage tank, a first connecting pipe fixedly connected to the other side of the storage tank, a second connecting pipe fixedly connected to the bottom end of the storage tank, and the first connecting pipe and the second connecting pipe respectively connected to air columns via pressure regulating valves. The automatic pressure regulating device for LNG fuel provided by the present invention maintains normal air pressure in the storage tank, ensuring the normal and safe use of fuel supplied to ships.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel equipment, and in particular to an automatic pressure regulating device for providing LNG fuel. Background Art

[0002] Liquefied natural gas (LNG), primarily composed of methane, is recognized as the cleanest fossil energy source on Earth. It is colorless, odorless, non-toxic, and non-corrosive. Its volume is approximately 1 / 625 of the volume of the same amount of gaseous natural gas, and its mass is only about 45% of the same volume of water. Its production process involves purifying natural gas produced in gas fields, liquefying it through a series of ultra-low temperature processes, and then transporting it aboard LNG ships. LNG, when burned, produces minimal air pollution and releases significant heat, making it a relatively advanced energy source. LNG is natural gas compressed and cooled to its freezing point (-161.5°C) to become a liquid. It is typically stored in cryogenic tanks at -161.5°C and a pressure of approximately 0.1 MPa. Its primary component is methane, transported by specialized ships or tanker trucks, and then re-gasified upon use.

[0003] Since LNG is easy to vaporize at room temperature, even LNG with good insulation performance will inevitably produce a large amount of boil-off gas due to factors such as collision, thereby forming low-temperature boil-off gas, which increases the air pressure in the storage tank. If the pressure is not relieved in time, the storage tank will be under too much pressure and there will be a risk of explosion. Therefore, ships generally use LNG fuel with pressure relief devices to discharge boil-off gas and relieve the pressure of the storage tank. The emission of large amounts of boil-off gas will cause fuel economic losses and air pollution.

[0004] There are many reasons that affect the changes in the air pressure in LNG storage tanks on marine ships. For example, the turbulence of the ship causes the liquid in the storage tank to vibrate violently, which increases the air pressure in the storage tank. For example, changes in temperature and air pressure will cause changes in the air pressure in the storage tank, which not only affects the service life of the storage tank, but also affects the normal use of LNG fuel.

[0005] Therefore, it is necessary to provide an automatic pressure regulating device for LNG fuel to ensure the safe use of the normal fuel supplied to ships. Summary of the Invention

[0006] In order to solve the technical problems in the above-mentioned background technology, maintain normal air pressure in the liquid storage tank, and ensure the normal and safe use of fuel supplied to ships, the present application provides an automatic pressure regulating device for providing LNG fuel, comprising a base, a mounting seat fixedly connected to the bottom end of the base, a mounting plate fixedly connected to the base, a support frame fixedly connected to the mounting plate, and a storage tank fixedly mounted on the support frame;

[0007] A pressure sensor is fixedly installed on the top of the storage tank, a first pipe is fixedly connected to one side of the storage tank, a second pipe is fixedly connected to one side of the storage tank, a first connecting pipe is fixedly connected to the other side of the storage tank, and a second connecting pipe is fixedly connected to the bottom end of the storage tank. The first connecting pipe and the second connecting pipe are respectively connected to air columns through pressure regulating valves;

[0008] A regulating box is fixed on the base, and a delivery pipe is fixedly installed on the top of the regulating box for providing gas to the ship. A liquid inlet pipe is fixedly connected to one side of the regulating box, and the liquid inlet pipe is communicated with the first pipeline. A motor and a pressure regulating chamber are provided inside the regulating box, and the motor is installed at the bottom of the regulating box through a support seat, and the output shaft of the motor is connected to a screw, and the end of the screw is fixedly connected to a limit plate, and the limit plate is slidably connected to the inner wall of the pressure regulating chamber, and the screw is threadedly connected to the outer side of the pressure regulating chamber, and the outer end of the limit plate is symmetrically fixedly connected to a guide rod at the upper and lower ends, and the guide rod is slidably connected to the outer side of the pressure regulating chamber, and the inner side of the limit plate is connected to a piston plate through a number of evenly distributed first springs, and a buffer chamber is formed between the piston plate and the pressure regulating chamber;

[0009] Two symmetrical buffer seats are fixed at the bottom end of the base, and a receiving groove is opened inside the buffer seat. The middle of the receiving groove is fixedly connected to a fixing seat, and the two ends of the fixing seat are respectively connected to a buffer spring;

[0010] When the pressure in the storage tank exceeds a first pressure threshold, the pressure regulating valve opens to discharge part of the fuel in the storage tank into the air column for pressure relief; when the pressure in the storage tank is lower than the first pressure threshold, the pressure regulating valve continues to remain closed;

[0011] When the gas column is filled with fuel and the pressure detected by the pressure sensor exceeds a second pressure threshold, the controller in the regulating box controls the motor to start, and the motor drives the limit plate to move toward the outside of the pressure regulating chamber, so that the buffer chamber space between the piston plate and the pressure regulating chamber is increased, and part of the fuel in the storage tank is discharged into the buffer chamber for pressure relief protection. When the pressure detected by the pressure sensor is lower than the second pressure threshold, the motor stops;

[0012] The second pressure threshold is greater than the first pressure threshold. When the pressure detected by the pressure sensor is lower than the first pressure threshold, the motor is reversed, causing the motor to drive the limit plate to move toward the inner side of the pressure regulating chamber, thereby reducing the buffer chamber space between the piston plate and the pressure regulating chamber. When the pressure detected by the pressure sensor is greater than the first pressure threshold, the motor stops.

[0013] Preferably, the other ends of the two buffer springs are fixedly connected to the inner wall of the accommodating groove, a pair of side plates are fixedly connected inside the accommodating groove, and sliding grooves are provided on opposite sides of the pair of side plates.

[0014] Preferably, a moving block is fixed above the ends of the two buffer springs, the moving block is fixedly connected to the bottom end of the base, and a pair of moving blocks are fixedly connected to both sides of a slide block, and the slide block is slidably connected to the inside of the slide groove.

[0015] Preferably, a support plate is provided at the bottom end of the buffer seat, and a pair of sleeve blocks are fixedly connected to both sides of the support plate, and a pair of sleeve blocks are provided with sliding holes, and the sliding holes are slidably connected to the telescopic rod, and one end of the telescopic rod is fixedly connected to the outside of the accommodating groove, and the other end of the telescopic rod is fixedly connected to a stop block, and the diameter of the stop block is larger than the diameter of the sliding hole, and a second spring is sleeved on the telescopic rod.

[0016] Preferably, a box door is rotatably connected to the surface of the regulating box, a door lock is installed on the box door, and heat dissipation holes are opened on the surface of the box door.

[0017] Preferably, a cover plate is sealed on the top of the storage tank, and a pressure gauge is fixedly installed on the surface of the storage tank.

[0018] In summary, the technical effects and advantages of the present invention are:

[0019] The present invention has a reasonable structure. When the pressure in the storage tank exceeds a first pressure threshold, the pressure regulating valve opens, allowing part of the fuel in the storage tank to be discharged into the gas column for pressure relief. When the pressure in the storage tank is lower than the first pressure threshold, the pressure regulating valve remains closed, thereby reducing the increased gas pressure in the storage tank, preventing evaporated gas from being discharged into the atmosphere, causing fuel waste and pollution, and extending the service life of the storage tank.

[0020] In the present invention, due to the action of the first spring, buffering adjustment can be performed when the air pressure in the storage tank changes, thereby maintaining the air pressure in the storage tank stable. When the air pressure in the storage tank changes significantly and the pressure detected by the pressure sensor exceeds the second pressure threshold, the motor can drive the limit plate to move toward the outside of the pressure regulating chamber, thereby increasing the buffer chamber space between the piston plate and the pressure regulating chamber, thereby discharging part of the fuel in the storage tank into the buffer chamber for pressure relief protection.

[0021] 3. In the present invention, the buffer spring can buffer the lateral vibration of the storage tank, while the second spring can buffer the longitudinal vibration of the storage tank, thereby reducing the oscillation of the liquid fuel in the storage tank, weakening the change of air pressure in the storage tank caused by the turbulence of the ship in the ocean, and avoiding frequent pressure adjustment actions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the storage tank;

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the storage tank from a side view;

[0025] Figure 3 This is a schematic diagram of the three-dimensional structure of the storage tank from a top view;

[0026] Figure 4 Schematic diagram of the three-dimensional structure of the regulating box;

[0027] Figure 5 Schematic diagram of the three-dimensional structure of the regulating box;

[0028] Figure 6 This is a schematic diagram of the internal cross-sectional structure of the regulating chamber;

[0029] Figure 7 This is a schematic diagram of the internal three-dimensional structure of the buffer seat;

[0030] Figure 8 is a three-dimensional schematic diagram of the support plate;

[0031] Figure 9 for Figure 7 A in the middle is an enlarged structural diagram;

[0032] Figure 10 It is a schematic diagram of the three-dimensional structure of the support plate when viewed from above.

[0033] In the figure: 1. Base; 102. Mounting plate; 103. Support frame; 104. Storage tank; 105. Cover plate; 2. Pressure gauge; 201. Pressure sensor; 202. First pipeline; 203. Second pipeline; 204. First connecting pipe; 205. Second connecting pipe; 206. Air column; 207. Pressure regulating valve; 3. Regulating box; 301. Delivery pipe; 302. Liquid inlet pipe; 304. Box door; 305. Motor; 306. Support base; 307. Pressure regulating chamber; 308. Screw ; 309, limit plate; 310, guide rod; 311, first spring; 312, piston plate; 313, buffer chamber; 314, door lock; 315, heat dissipation hole; 4, buffer seat; 401, accommodating groove; 402, fixed seat; 403, buffer spring; 405, side plate; 406, slide groove; 407, moving block; 408, slider; 409, pulley; 5, support plate; 501, sleeve block; 502, slide hole; 503, telescopic rod; 504, stop block; 505, second spring. Implementation Method

[0034] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention. Example

[0035] refer to Figure 1-4 An automatic device for providing LNG fuel is shown, including a base 1, a mounting seat 101 is fixedly connected to the bottom end of the base 1, a mounting plate 102 is fixedly connected to the base 1, a support frame 103 is fixedly connected to the mounting plate 102, a storage tank 104 is fixedly installed on the support frame 103, a cover plate 105 is sealed and installed on the top of the storage tank 104, a pressure gauge 2 is fixedly installed on the surface of the storage tank 104, a pressure sensor 201 is fixedly installed on the top of the storage tank 104, a first pipe 202 is fixedly connected to one side of the storage tank 104, a second pipe 203 is fixedly connected to one side of the storage tank 104, a first connecting pipe 204 is fixedly connected to the other side of the storage tank 104, a second connecting pipe 205 is fixedly connected to the bottom end of the storage tank 104, and the first connecting pipe 204 and the second connecting pipe 205 are respectively connected to gas columns 206 through pressure regulating valves 207.

[0036] Specifically, it should be noted that the pressure gauge 2 and the pressure sensor 201 on the storage tank 104 are used in conjunction with the storage tank 104. The pressure gauge 2 can display the pressure value inside the storage tank 104, and the pressure sensor 201 can monitor the inside of the storage tank 104 in real time. The specific working principles are referenced by the existing technology and will not be elaborated on here.

[0037] As an implementation method in this embodiment, according to the attached Figure 5 and 6 As shown, when the pressure in the storage tank 104 exceeds the first pressure threshold, the pressure regulating valve 207 opens, allowing part of the fuel in the storage tank 104 to be discharged into the gas column 206 for pressure relief. When the pressure in the storage tank 104 is less than the first pressure threshold, the pressure regulating valve 207 continues to remain closed, thereby reducing the increased gas pressure in the storage tank 104, avoiding the discharge of evaporated gas into the atmosphere, causing fuel waste and pollution, and increasing the service life of the storage tank 104. The specific working principle of the pressure regulating valve 207 is referenced by the existing technology and will not be elaborated on here. Example

[0038] Since the air pressure of the air column buffer in Example 1 is limited, a wide range of pressure regulation is required when facing harsh environments. In this embodiment, a regulating box 3 is fixed on the base 1, and a delivery pipe 301 is fixedly installed on the top of the regulating box 3 to provide gas to the ship. The surface of the regulating box 3 is rotatably connected to a box door 303, and a door lock 304 is installed on the box door 303. The surface of the box door 303 is provided with a heat dissipation hole 314. One side of the regulating box 3 is fixedly connected to a liquid inlet pipe 302, and the liquid inlet pipe 302 is communicated with the first pipe 202. The interior of the regulating box 3 is provided with a motor 305 and a pressure regulating chamber 307. The motor 30 It is mounted on the bottom of the regulating box 3 via a support base 306. The output shaft of the motor 305 is connected to a screw rod 308. The end of the screw rod 308 is fixedly connected to a limit plate 309. The limit plate 309 is slidably connected to the inner wall of the pressure regulating chamber 307. The screw rod 308 is threadedly connected to the outer side of the pressure regulating chamber 307. The outer end of the limit plate 309 is symmetrically fixedly connected to a guide rod 310 in the upper and lower directions. The guide rod 310 is slidably connected to the outer side of the pressure regulating chamber 307. The inner side of the limit plate 309 is connected to a piston plate 312 via a plurality of evenly distributed first springs 311. A buffer chamber 313 is formed between the piston plate 312 and the pressure regulating chamber 307.

[0039] When the pressure in the storage tank 104 exceeds the first pressure threshold, the pressure regulating valve 207 opens, allowing part of the fuel in the storage tank 104 to be discharged into the gas column 206 for pressure relief. When the pressure in the storage tank 104 is lower than the first pressure threshold, the pressure regulating valve 207 continues to remain closed.

[0040] When the gas column 206 is filled with fuel and the pressure detected by the pressure sensor 201 exceeds the second pressure threshold, the controller in the regulating box 3 controls the motor 305 to start, and the motor 305 drives the limit plate 309 to move toward the outside of the pressure regulating chamber 307, so that the space of the buffer chamber 313 between the piston plate 312 and the pressure regulating chamber 307 is increased, and part of the fuel in the storage tank 104 is discharged into the buffer chamber 313 for pressure relief protection. When the pressure detected by the pressure sensor 201 is lower than the second pressure threshold, the motor 305 stops.

[0041] Among them, the second pressure threshold is greater than the first pressure threshold. When the pressure detected by the pressure sensor 201 is lower than the first pressure threshold, the motor 305 reverses, so that the motor 305 drives the limit plate 309 to move toward the inside of the pressure regulating chamber 307, so that the space of the buffer chamber 313 between the piston plate 312 and the pressure regulating chamber 307 is reduced. When the pressure detected by the pressure sensor 201 is greater than the first pressure threshold, the motor 305 stops.

[0042] Due to the action of the first spring 311, buffering adjustment can be performed when the air pressure in the storage tank 104 changes, so as to maintain the air pressure in the storage tank 104 stable. When the air pressure in the storage tank 104 changes greatly and the pressure detected by the pressure sensor 201 exceeds the second pressure threshold, the motor 305 can drive the limit plate 309 to move toward the outside of the pressure regulating chamber 307, so that the space of the buffer chamber 313 between the piston plate 312 and the pressure regulating chamber 307 is increased, thereby discharging part of the fuel in the storage tank 104 into the buffer chamber 313 for pressure relief protection.

[0043] In order to maintain the air pressure balance in the storage tank 104, when the pressure detected by the pressure sensor 201 is lower than the first pressure threshold, the motor 305 reverses, so that the motor 305 drives the limit plate 309 to move toward the inside of the pressure regulating chamber 307, so that the space of the buffer chamber 313 between the piston plate 312 and the pressure regulating chamber 307 is reduced. When the pressure detected by the pressure sensor 201 is greater than the first pressure threshold, the motor 305 stops, and the air pressure in the storage tank 104 can be adjusted back to normal pressure to ensure the normal use of LNG fuel. Example

[0044] On the basis of Examples 1 and 2, as the ship is constantly bumping in the ocean, the liquid fuel is constantly oscillating in the storage tank 104, and the air pressure in the storage tank 104 is also constantly changing. In order to avoid frequent pressure adjustment actions, this embodiment has two symmetrical buffer seats 4 fixed at the bottom end of the base 1, and a receiving groove 401 is provided inside the buffer seat 4. A fixing seat 402 is fixedly connected to the middle of the receiving groove 401, and buffer springs 403 are respectively connected to both ends of the fixing seat 402. The other ends of the two buffer springs 403 are fixedly connected to the inner wall of the receiving groove 401, and a pair of side plates 405 are fixedly connected to the inside of the receiving groove 401. A slide groove 406 is provided on the opposite sides of the pair of side plates 405. A moving block 407 is fixed above the end of the two buffer springs 403, and the moving block is fixedly connected to the bottom end of the base 1. Slide blocks 408 are fixedly connected to both sides of the pair of moving blocks 407, and the slide blocks 408 are slidably connected to the inside of the slide groove 406.

[0045] Among them, a support plate 5 is provided at the bottom end of the buffer seat 4, and a pair of sleeve blocks 501 are fixedly connected on both sides of the support plate 5. A sliding hole 502 is opened on the pair of sleeve blocks 501, and the sliding hole 502 is slidably connected to the telescopic rod 503. One end of the telescopic rod 503 is fixedly connected to the outside of the accommodating groove 401, and the other end of the telescopic rod 503 is fixedly connected to a stop block 504. The diameter of the stop block 504 is larger than the diameter of the sliding hole 502, and a second spring 505 is sleeved on the telescopic rod 503.

[0046] The buffer spring 403 can buffer the lateral vibration of the storage tank 104, while the second spring 505 can buffer the longitudinal vibration of the storage tank 104, thereby reducing the oscillation of the liquid fuel in the storage tank 104 and weakening the change in the air pressure in the storage tank 104 caused by the turbulence of the ship in the ocean, thereby avoiding the frequent pressure adjustment actions in Examples 1 and 2.

[0047] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automatic pressure regulating device for providing LNG fuel, comprising a base (1), characterized in that: The bottom end of the base (1) is fixedly connected to a mounting seat (101), a mounting plate (102) is fixedly connected to the base (1), a support frame (103) is fixedly connected to the mounting plate (102), and a storage tank (104) is fixedly mounted on the support frame (103); A pressure sensor (201) is fixedly installed on the top of the storage tank (104); a first pipe (202) is fixedly connected to one side of the storage tank (104); a second pipe (203) is fixedly connected to one side of the storage tank (104); a first connecting pipe (204) is fixedly connected to the other side of the storage tank (104); a second connecting pipe (205) is fixedly connected to the bottom of the storage tank (104); the first connecting pipe (204) and the second connecting pipe (205) are respectively connected to air columns (206) via pressure regulating valves (207); A regulating box (3) is fixed on the base (1), a delivery pipe (301) is fixedly installed on the top of the regulating box (3) for supplying gas to the ship, a liquid inlet pipe (302) is fixedly connected to one side of the regulating box (3), the liquid inlet pipe (302) is communicated with the first pipeline (202), a motor (305) and a pressure regulating chamber (307) are provided inside the regulating box (3), the motor (305) is installed on the bottom of the regulating box (3) through a support base (306), the output shaft of the motor (305) is connected to a screw (308), and the end of the screw (308) is connected to the screw (308). The end is fixedly connected to a limit plate (309), the limit plate (309) is slidably connected to the inner wall of the pressure regulating chamber (307), the screw (308) is threadedly connected to the outer side of the pressure regulating chamber (307), the outer end of the limit plate (309) is symmetrically fixedly connected to a guide rod (310) in the upper and lower directions, the guide rod (310) is slidably connected to the outer side of the pressure regulating chamber (307), the inner side of the limit plate (309) is connected to a piston plate (312) through a plurality of evenly distributed first springs (311), and a buffer chamber (313) is formed between the piston plate (312) and the pressure regulating chamber (307); Two symmetrical buffer seats (4) are fixed to the bottom end of the base (1), a receiving groove (401) is provided inside the buffer seat (4), a fixing seat (402) is fixedly connected to the middle of the receiving groove (401), and buffer springs (403) are respectively connected to the two ends of the fixing seat (402); When the pressure in the storage tank (104) exceeds a first pressure threshold, the pressure regulating valve (207) opens, allowing part of the fuel in the storage tank (104) to be discharged into the gas column (206) for pressure relief; when the pressure in the storage tank (104) is less than the first pressure threshold, the pressure regulating valve (207) continues to remain closed; When the gas column (206) is filled with fuel and the pressure detected by the pressure sensor (201) exceeds a second pressure threshold, the controller in the regulating box (3) controls the motor (305) to start, and the motor (305) drives the limit plate (309) to move toward the outside of the pressure regulating chamber (307), so that the space of the buffer chamber (313) between the piston plate (312) and the pressure regulating chamber (307) increases, and part of the fuel in the storage tank (104) is discharged into the buffer chamber (313) for pressure relief protection. When the pressure detected by the pressure sensor (201) is lower than the second pressure threshold, the motor (305) stops; The second pressure threshold is greater than the first pressure threshold. When the pressure detected by the pressure sensor (201) is lower than the first pressure threshold, the motor (305) is reversed, so that the motor (305) drives the limit plate (309) to move toward the inside of the pressure regulating chamber (307), so that the space of the buffer chamber (313) between the piston plate (312) and the pressure regulating chamber (307) is reduced. When the pressure detected by the pressure sensor (201) is greater than the first pressure threshold, the motor (305) stops.

2. The automatic pressure regulating device for providing LNG fuel according to claim 1, characterized in that: The other ends of the two buffer springs (403) are fixedly connected to the inner wall of the accommodating groove (401), and a pair of side plates (405) are fixedly connected inside the accommodating groove (401). The opposite sides of the pair of side plates (405) are provided with sliding grooves (406).

3. The automatic pressure regulating device for providing LNG fuel according to claim 2, characterized in that: A moving block (407) is fixed above the ends of the two buffer springs (403), and the moving block is fixedly connected to the bottom end of the base (1). A pair of sliding blocks (408) are fixedly connected on both sides of the moving blocks (407), and the sliding blocks (408) are slidably connected inside the sliding groove (406).

4. The automatic pressure regulating device for providing LNG fuel according to claim 3, characterized in that: A support plate (5) is provided at the bottom end of the buffer seat (4), and a pair of sleeve blocks (501) are fixedly connected on both sides of the support plate (5), and a sliding hole (502) is opened on the pair of sleeve blocks (501), and the sliding hole (502) is slidably connected to the telescopic rod (503), and one end of the telescopic rod (503) is fixedly connected to the outside of the accommodating groove (401), and the other end of the telescopic rod (503) is fixedly connected to a stopper (504), and the diameter of the stopper (504) is larger than the diameter of the sliding hole (502), and a second spring (505) is sleeved on the telescopic rod (503).

5. The automatic pressure regulating device for providing LNG fuel according to claim 1, characterized in that: The surface of the regulating box (3) is rotatably connected to a box door (303), a door lock (304) is installed on the box door (303), and a heat dissipation hole (314) is opened on the surface of the box door (303).

6. The automatic pressure regulating device for providing LNG fuel according to claim 1, characterized in that: A cover plate (105) is sealed and installed on the top of the storage tank (104), and a pressure gauge (2) is fixedly installed on the surface of the storage tank (104).

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