Pressure adjusting device of liquefied natural gas storage tank

Abstract

The utility model belongs to the technical field of liquefied natural gas storage tanks, and particularly relates to a liquefied natural gas storage tank pressure adjusting device which comprises an output pipe and an input pipe, a support is fixedly arranged below the input pipe and the output pipe, the input pipe is used for being connected with a liquefied natural gas storage tank, and a valve body is arranged between the input pipe and the output pipe. Two gear rings are rotatably mounted on the valve body, a buffer cavity is formed between the two gear rings in the valve body, a buffer mechanism is arranged in the buffer cavity, and the buffer mechanism comprises a baffle; fixing plates are fixedly arranged on the inner walls of the two ends of the valve body correspondingly, and a rotating plate is arranged on one side of each fixing plate and rotationally installed in the valve body. According to the device, a two-layer adjusting structure is arranged in the valve body, when the torsion motor fails, especially when the torsion motor cannot be closed, a worker can conduct manual adjustment through an adjusting button, emergency treatment is conducted, and the safety of facilities is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquefied natural gas storage tanks, and in particular relates to a pressure regulating device for a liquefied natural gas storage tank. Background Art

[0002] Pressure control and leakage prevention of liquefied natural gas (LNG) tanks are very important, especially for horizontal LNG tanks. By means of pressure regulation, the pressure in the LNG tank can be kept within a safe range to avoid damage to the tank or safety accidents caused by excessive or low pressure.

[0003] In the prior art, when it is necessary to regulate the pressure of liquefied natural gas storage tanks, a single direct regulation method is generally used to regulate the pressure through valves. When a problem occurs in the single control method, it is difficult to carry out emergency processing, especially when there is a problem with the closing of the regulating device. Utility Model Content

[0004] The utility model is a liquefied natural gas storage tank pressure regulating device proposed to solve the technical problems proposed in the background technology.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A liquefied natural gas storage tank pressure regulating device, comprising an output pipe and an input pipe, brackets are fixedly arranged below the input pipe and the output pipe, the input pipe is used to connect with the liquefied natural gas storage tank, a valve body is arranged between the input pipe and the output pipe, two gear rings are rotatably mounted on the valve body, a buffer cavity is formed between the two gear rings in the valve body, a buffer mechanism is arranged in the buffer cavity, and the buffer mechanism includes a baffle;

[0007] A fixed plate is fixedly arranged on the inner walls at both ends of the valve body, a rotating plate is arranged on one side of the fixed plate, the rotating plate is rotatably installed in the valve body, and the two rotating plates are fixedly connected to the two gear rings respectively;

[0008] One side of the two gear rings is meshedly connected with an adjusting gear, one of the adjusting gears is rotated by an adjusting knob, and the other adjusting gear is rotated by a torque motor.

[0009] Preferably, the torque motor is fixedly connected to the bracket via an L-shaped plate, the driving end of the torque motor is fixedly connected to the corresponding adjusting gear, the adjusting button is fixedly connected to the corresponding adjusting gear via a linkage shaft, the linkage shaft is fixedly connected to the bracket via an L-shaped shaft, and the torque motor is arranged above the gear ring close to the input pipe side.

[0010] Preferably, a buffer plate used in conjunction with a baffle is fixedly provided on the inner wall of the buffer cavity, a fixed shaft is fixedly connected to the buffer plate, the baffle is slidably sleeved on the fixed shaft, a spring is fixedly connected to one side of the baffle through a convex shaft, the spring is fixedly connected to the surface of the buffer plate, and the baffle is arranged on the side of the buffer plate away from the input pipe.

[0011] Preferably, a mounting plate is fixedly connected to the outer surface of the buffer chamber, the mounting plate is fixedly connected to the bracket, rotating grooves are provided on both sides of the gear ring, a rotating sealing ring is provided in the rotating groove, and both sides of the gear ring are rotatably connected to the valve body and the buffer chamber through the rotating sealing ring.

[0012] Preferably, a plurality of mounting holes are provided on the bottom and sides of the bracket.

[0013] Preferably, one side of the rotating plate is fixedly connected to the inner wall of the gear ring via a connecting shaft, a plurality of sector-shaped openings are equidistantly provided on the fixed plate, and a plurality of sector-shaped blocks for use with the rotating plate are provided on the rotating plate.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: the device is provided with a two-layer adjustment structure in the valve body, the end close to the input pipe is automatically adjusted by a torque motor, and the end away from the input pipe can be manually adjusted by an adjusting button. When the torque motor fails, especially when it cannot be closed, the staff can manually adjust it through the adjusting button for emergency treatment to ensure the safety of the facility. When the torque motor cannot be turned on, the fixed plate and the rotating plate on one side of the adjusting button are overlapped and closed, and the staff can perform maintenance and replacement in a relatively stable environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a liquefied natural gas storage tank pressure regulating device proposed by the utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of a liquefied natural gas storage tank pressure regulating device proposed by the utility model;

[0017] Figure 3 is a structural schematic diagram of a fixed plate;

[0018] Figure 4 Schematic diagram of the structure of the rotating plate and the gear ring.

[0019] In the figure: 1 bracket, 2 input pipe, 3 output pipe, 4 valve body, 5 buffer chamber, 6 gear ring, 7 torque motor, 8 adjusting button, 9 adjusting gear, 10 fixed plate, 11 rotating plate, 12 connecting shaft, 13 buffer plate, 14 baffle, 15 spring, 16 fixed shaft. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0022] Reference Figure 1-Figure 4 A liquefied natural gas storage tank pressure regulating device comprises an output pipe 3 and an input pipe 2, a bracket 1 is fixedly arranged below the input pipe 2 and the output pipe 3, the input pipe 2 is used to connect with the liquefied natural gas storage tank, a valve body 4 is arranged between the input pipe 2 and the output pipe 3, two gear rings 6 are rotatably mounted on the valve body 4, a buffer cavity 5 is formed between the two gear rings 6 in the valve body 4, a buffer mechanism is arranged in the buffer cavity 5, and the buffer mechanism comprises a baffle 14; a fixed plate 10 is fixedly arranged on the inner wall at both ends of the valve body 4, a rotating plate 11 is arranged on one side of the fixed plate 10, the rotating plate 11 is rotatably mounted in the valve body 4, and the two rotating plates 11 are respectively fixedly connected with the two gear rings 6; one side of the two gear rings 6 is meshedly connected with an adjusting gear 9, one of the adjusting gears 9 is rotated by an adjusting knob 8, and the other adjusting gear 9 is rotated by a torque motor 7.

[0023] The torque motor 7 is fixedly connected to the bracket 1 through an L-shaped plate, the driving end of the torque motor 7 is fixedly connected to the corresponding adjusting gear 9, the adjusting button 8 is fixedly connected to the corresponding adjusting gear 9 through a linkage shaft, the linkage shaft is fixedly connected to the bracket 1 through an L-shaped shaft, the torque motor 7 is arranged above the gear ring 6 close to the side of the input pipe 2, the torque motor 7 is fixedly connected to the adjusting gear 9 through the driving end, the adjusting gear 9 drives the meshing gear ring 6 to rotate, and then the relative angle between the fixed plate 10 and the rotating plate 11 can be changed to realize the release of the internal pressure of the storage tank. The fixed plate 10 and the rotating plate 11 have different pressure release speeds under different degrees of overlap. Similarly, the adjusting button 8 drives the connected adjusting gear 9 to rotate through the linkage shaft to realize the secondary pressure regulation function. The manual regulation is combined with the automatic regulation to provide double protection, and the regulation effect can be performed again on the basis of the automatic regulation.

[0024] A buffer plate 13 used in conjunction with a baffle 14 is fixedly arranged on the inner wall of the buffer chamber 5, a fixed shaft 16 is fixedly connected to the buffer plate 13, the baffle 14 is slidably sleeved on the fixed shaft 16, a spring 15 is fixedly connected to one side of the baffle 14 through a convex shaft, the spring 15 is fixedly connected to the surface of the buffer plate 13, the baffle 14 is arranged on the side of the buffer plate 13 away from the input pipe 2, when the internal pressure of the storage tank is released, a force is exerted on the baffle 14, so that the spring 15 is stretched, and the baffle 14 and the buffer plate 13 are away from each other, wherein the elastic spring 15 has a buffering effect to avoid problems caused by excessive pressure release. The baffle 14 can close the buffer plate 13 through the spring 15 to play a buffering role.

[0025] A mounting plate is fixedly connected to the outer surface of the buffer chamber 5, and the mounting plate is fixedly connected to the bracket 1. Rotating grooves are provided on both sides of the gear ring 6, and rotating sealing rings (not shown) are provided in the rotating grooves. Both sides of the gear ring 6 are rotatably connected to the valve body 4 and the buffer chamber 5 through rotating sealing rings. The rotating sealing rings play a sealing role to ensure the sealing effect during the rotation process. Rotation is only required when pressure adjustment is performed, and the relative rotation time is short, so the rotating connection can also ensure sealing.

[0026] A plurality of mounting holes are provided at the bottom and sides of the bracket 1 , and mounting holes for installation are provided on the surrounding surfaces of the bracket 1 , so that the bracket 1 can adapt to installation environments at different angles.

[0027] One side of the rotating plate 11 is fixedly connected to the inner wall of the gear ring 6 through the connecting shaft 12. The fixed plate 10 is provided with a plurality of fan-shaped openings at equal intervals. The rotating plate 11 is provided with a plurality of fan-shaped blocks for use with the fan-shaped openings. When the fan-shaped blocks and the fan-shaped openings completely overlap, the fan-shaped openings are blocked. When the fan-shaped blocks and the fan-shaped openings are staggered with each other, and the greater the degree of staggering, the faster the pressure in the storage tank is released.

[0028] The input pipe 2 at one end of the device is fixedly connected to the liquefied natural gas storage tank, and the device is fixedly installed on the surface of the liquefied natural gas storage tank or other external structures through the bracket 1. When adjusting the pressure, the staff can first operate the adjusting button 8 before adjusting the pressure, and rotate the adjusting button 8 to drive the meshing adjusting gear 9 to rotate, and the adjusting gear 9 drives the corresponding meshing gear ring 6 to rotate, and then the degree of mutual offset between the fixed plate 10 and the rotating plate 11 away from one end of the input pipe 2 can be adjusted, so as to control the size of the cross-section flowing through the output end when the inlet pressure is adjusted, which plays the role of output limitation.

[0029] Restart the torque motor 7, and the torque motor 7 drives the fixed plate 10 near the side of the input pipe 2 to rotate through the driving end, so that the fixed plate 10 and the rotating plate 11 are staggered with each other, and then the pressure inside the liquefied natural gas storage tank can be adjusted. When the pressure is released, the gas flows from one end of the input pipe 2 to the output pipe 3. During the flow, it passes through the buffer mechanism, and the gas exerts a force on the baffle 14. Under the action of the force, the spring 15 is stretched, and the baffle 14 is separated from the buffer plate 13, and the gas can flow. The elastic spring 15 buffers at the moment of pressure release, thereby avoiding the problem caused by the sudden change of pressure at the moment of opening and closing.

[0030] The device is provided with a two-layer adjustment structure in the valve body 4. The end close to the input pipe 2 is automatically adjusted by the torque motor 7, and the end away from the input pipe 2 can be manually adjusted by the adjustment button 8. When the torque motor 7 fails, especially when it cannot be closed, the staff can manually adjust it through the adjustment button 8 for emergency treatment to ensure the safety of the facility. When the torque motor 7 cannot be turned on, the fixed plate 10 and the rotating plate 11 on one side of the adjustment button 8 are overlapped and closed, and the staff can perform maintenance and replacement in a relatively stable environment.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A liquefied natural gas storage tank pressure regulating device, characterized in that: The invention comprises an output pipe (3) and an input pipe (2), wherein a bracket (1) is fixedly arranged below the input pipe (2) and the output pipe (3), wherein the input pipe (2) is used to be connected to a liquefied natural gas storage tank, wherein a valve body (4) is arranged between the input pipe (2) and the output pipe (3), wherein two gear rings (6) are rotatably mounted on the valve body (4), wherein a buffer cavity (5) is formed between the two gear rings (6) in the valve body (4), wherein a buffer mechanism is arranged in the buffer cavity (5), wherein the buffer mechanism comprises a baffle (14); A fixed plate (10) is fixedly arranged on the inner walls at both ends of the valve body (4), a rotating plate (11) is arranged on one side of the fixed plate (10), the rotating plate (11) is rotatably installed in the valve body (4), and the two rotating plates (11) are fixedly connected to the two gear rings (6) respectively; One side of the two gear rings (6) is meshedly connected with an adjusting gear (9), one of the adjusting gears (9) is rotated by an adjusting knob (8), and the other adjusting gear (9) is rotated by a torque motor (7).

2. A liquefied natural gas storage tank pressure regulating device according to claim 1, characterized in that: The torque motor (7) is fixedly connected to the bracket (1) via an L-shaped plate, the driving end of the torque motor (7) is fixedly connected to the corresponding adjustment gear (9), the adjustment button (8) is fixedly connected to the corresponding adjustment gear (9) via a linkage shaft, the linkage shaft is fixedly connected to the bracket (1) via an L-shaped shaft, and the torque motor (7) is arranged above the gear ring (6) on the side close to the input pipe (2).

3. A liquefied natural gas storage tank pressure regulating device according to claim 1, characterized in that: A buffer plate (13) for use with a baffle (14) is fixedly arranged on the inner wall of the buffer cavity (5); a fixed shaft (16) is fixedly connected to the buffer plate (13); the baffle (14) is slidably sleeved on the fixed shaft (16); a spring (15) is fixedly connected to one side of the baffle (14) via a convex shaft; the spring (15) is fixedly connected to the surface of the buffer plate (13); and the baffle (14) is arranged on a side of the buffer plate (13) away from the input pipe (2).

4. A liquefied natural gas storage tank pressure regulating device according to claim 1, characterized in that: A mounting plate is fixedly connected to the outer surface of the buffer chamber (5), and the mounting plate is fixedly connected to the bracket (1). Rotation grooves are provided on both sides of the gear ring (6), and a rotating sealing ring is provided in the rotating groove. Both sides of the gear ring (6) are rotatably connected to the valve body (4) and the buffer chamber (5) via the rotating sealing ring.

5. The liquefied natural gas storage tank pressure regulating device according to claim 1, characterized in that: The bottom and side surfaces of the bracket (1) are provided with a plurality of mounting holes.

6. A liquefied natural gas storage tank pressure regulating device according to claim 1, characterized in that: One side of the rotating plate (11) is fixedly connected to the inner wall of the gear ring (6) via a connecting shaft (12); a plurality of sector-shaped openings are equidistantly provided on the fixed plate (10); and a plurality of sector-shaped blocks for use with the rotating plate (11) are provided.

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