Liquid-filled ball-based rebound composite electromagnetic energy dissipation sloshing mitigation device for large-scale LNG storage tank

Abstract

A liquid-filled ball-based rebound composite electromagnetic energy dissipation sloshing mitigation device for a large-scale LNG storage tank, mounted in a tank body, and comprising a liquid-filled ball, and a steel strand, a sealed support housing, a gas spring, ball screws, horizontal pistons and a vertical piston which are arranged below the liquid-filled ball. When sloshing occurs at the liquid surface, the gas spring is pulled by the steel strand to generate vertical displacement and provide a restoring force, and the vertical displacement of the gas spring drives blades on sleeves of the ball screws at the bottom to rotate in a damping fluid, dissipating energy. Hydraulic transmission is used instead of mechanical transmission of conventional piston motion, and the horizontal pistons undergo horizontal displacement in the case of pressure unbalance, thus enhancing the flexibility of the motion of the horizontal pistons; magnets are arranged in horizontal slideways and the horizontal pistons to intensify the motion of the horizontal pistons and the relative motion between the horizontal pistons and the interior, thereby achieving more efficient energy dissipation; the structure is simple, it is easy to mount, system components work in conjunction, the energy dissipation efficiency is high by means of the synergistic effect of multiple energy dissipation technologies, and the influence of earthquakes on structures of large LNG storage tanks can be reduced.

Description

A liquid-filled ball rebound composite electromagnetic energy-consuming large LNG storage tank sway reduction device Technical Field

[0001] The present invention belongs to the technical field of damping and vibration reduction, in particular to the technical field of liquid storage sway reduction of large LNG storage tanks, and relates to a large LNG storage tank sway reduction device with electromagnetic energy consumption. Background Art

[0002] LNG is a liquid derived from natural gas compressed and cooled to -162°C. Compared to traditional coal and oil, LNG is a cleaner, more efficient, and greener energy source. LNG storage tanks are a critical engineering technology for urban lifelines, and their ability to withstand natural disasters like earthquakes is a crucial factor in determining the performance of these facilities. Seismic events can cause the tanks to lose functionality, sparking fires or explosions, endangering people and property in the surrounding area and resulting in significant economic losses.

[0003] Under the action of an earthquake, the liquid in the LNG storage tank will slosh, causing additional dynamic water pressure on the tank wall and affecting the safety of the tank structure. The sloshing liquid may also have a direct impact on the ceiling, causing damage to the pipe joints and their accessories. In order to reduce the seismic response of the LNG storage tank, base isolation is used. Studies have found that the isolation system can effectively reduce the seismic response of the tank structure, but after isolation, it may cause the sloshing wave height of the liquid to increase, exacerbating the sloshing of the liquid surface. Therefore, in order to ensure the safety of the tank structure, it is necessary to design a device that can effectively reduce the sloshing wave height of the stored liquid to solve the existing practical problems. Technical issues

[0004] The present invention provides a sloshing reduction device that can effectively reduce the height of liquid surface sloshing waves in large LNG storage tanks, and can significantly reduce the amplitude of liquid sloshing, thereby reducing the impact of liquid surface sloshing caused by earthquakes on the tank structure. Technical Solutions

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A liquid-filled ball rebound type composite electromagnetic energy-consuming large-scale LNG storage tank sway reduction device is installed inside the tank body of the LNG storage tank. The LNG storage tank sway reduction device includes: a liquid-filled ball 1 and a steel strand 2 arranged below the liquid-filled ball 1, a closed support shell 3, a gas spring 4, a ball screw 5, a horizontal piston 6, and a vertical piston 7.

[0007] The liquid-filled ball 1 is a closed hollow ball filled with damping liquid. The damping liquid should be a liquid with a lower density than the LNG storage liquid, occupying half of the volume of the sphere so that it can float on the liquid surface in the LNG storage tank; the steel strand 2 is used to connect the liquid-filled ball 1 and the vertical piston 7, that is, the upper end of the steel strand 2 is fixed below the liquid-filled ball 1, and the lower end is fixed to the semicircular ring buckle on the top of the vertical piston 7.

[0008] The enclosed support shell 3 comprises a horizontal structure and a vertical structure, forming an integrated structure fixed to the bottom surface of the LNG storage tank. The horizontal structure is composed of two hollow, elongated cylindrical structures arranged in a "cross shape," defined as a horizontal slide. The vertical structure is arranged at the central intersection. The vertical structure is also a hollow, elongated cylindrical structure, defined as a vertical slide, where the radius of the vertical slide is twice that of the horizontal slide. By welding four sets of steel mesh 22 at the interface between the horizontal and vertical structures inside the enclosed support shell 3, the enclosed support shell 3 is divided into four horizontal slides, two perpendicular to each other, and a vertical slide perpendicular to the plane of the horizontal slides.

[0009] The gas spring 4 is located within the vertical slideway, with its upper end fixed to the lower bottom surface of the vertical piston 7 and its lower end fixed to the inner bottom surface of the sealed support housing 3. The gas spring 4 is used to prevent the vertical piston 7 from disengaging from the vertical slideway, ensuring the normal operation of the device and providing elastic restoring force for the liquid-filled ball 1. The ball screw 5 is located within the vertical slideway, with fan blades installed on its sleeve in the same installation position as the gas spring 4. Its upper end is fixed to the lower bottom surface of the vertical piston 7 and its lower end is fixed to the inner bottom surface of the sealed support housing 3. The upper end of the ball screw 5 is connected to the vertical piston 7 by a first roller 21. The sleeve of the ball screw 5 is fixed to the shaft ring of the first roller 21, and the vertical piston 7 is fixed to the seat ring of the first roller 21. There is no contact between the ball screw 5 and the vertical piston 7, that is, the rotation of the sleeve of the ball screw 5 and the vertical displacement of the vertical piston 7 do not affect each other.

[0010] The horizontal pistons 6 are four hollow cylinders, mounted within the four horizontal slideways of the sealed support housing 3. The hollow cylinders are arranged horizontally, with first magnets 61 mounted on each of their left and right end faces. Second annular magnets 62 are mounted on the sides. The magnetic poles of the second annular magnets 62 are radially magnetized, with the N and S poles divided into two semi-circular cylinders. A horizontally arranged ball screw 63 is installed within the horizontal piston 6. The ends of the ball screw 63's lever are perpendicularly fixed to the left and right end faces of the horizontal piston 6. The sleeve of the ball screw 63 is movable on the lever, and composite metal blades 67 are mounted on the sleeve. Third annular magnets 65 are mounted on each end of the sleeve, with the S poles of the first and third annular magnets 61 and 65 facing each other, generating a repulsive force when they approach. The third annular magnet 65 is surrounded by a copper block 66. This acts as a support, maintaining the sleeve of the ball screw 63 horizontal and increasing the internal structural mass. Its antimagnetic properties prevent it from being affected by the second annular magnet 62, facilitating horizontal movement. Furthermore, the movement of the copper block 66 in the magnetic field itself generates damping, dissipating energy. The sleeve of the ball screw 63 and the third annular magnet 65 are connected by a second roller 64. The sleeve of the ball screw 63 is fixed to the shaft ring of the second roller 64, while the third annular magnet 65 is fixed to the seat ring of the second roller 64. The two do not contact each other, ensuring that horizontal movement of the third annular magnet 65 does not affect the rotation of the sleeve of the ball screw 63.

[0011] The lower half of the vertical piston 7, a cylindrical piston, is placed in the vertical slideway of the sealed support housing 3. The lower base of the cylindrical connecting rod in the upper half is vertically fixed to the upper surface of the cylindrical piston, extending upward through the outer surface of the sealed support housing 3 and out of the combined support. A semicircular ring is provided at its end. The lower end of the steel strand 2 is fixed to the semicircular ring on the upper half of the vertical piston 7. The lower base of the vertical piston 7 is connected to the ball screw 5 and the gas spring 4. The vertical piston 7 and the four horizontal pistons 6 together divide the sealed support housing 3 into six enclosed spaces, the middle enclosed space of which is filled with damping fluid. The pistons are in contact with the slideway wall but are not fixed, allowing them to move. The six enclosed spaces are: a closed space between the upper surface of the cylindrical piston of the vertical piston 7 and the top of the vertical structure; four closed spaces between the four horizontal pistons 6 and the inner side of the horizontal structure; and a closed space between the bottom of the vertical piston 7 and the inner side of the four horizontal pistons.

[0012] A vertical steel mesh 22 is installed at the intersection of the horizontal and vertical slideways of the sealed support housing 3 to prevent the horizontal piston 6 from escaping the horizontal slideway. Magnets 23 are installed at both ends of the horizontal slideway of the sealed support housing 3, with two sets of magnets 23 fixed to the steel mesh 22 and the sealed support housing 3 respectively.

[0013] Furthermore, the lead screw of the ball screw 63 is vertically fixed to the left and right end surfaces of the horizontal piston 6 through the inner rings of the first annular magnet 61, the second annular magnet 62, and the third annular magnet 63, and the inner ring diameters of these annular magnets are slightly larger than the lead screw diameter.

[0014] Furthermore, the north pole of the magnet 23 is opposite to the north pole of the first annular magnet 61 installed on the left and right end surfaces of the horizontal piston 6.

[0015] Furthermore, the material selected for the sealed support housing 3 should meet the strength requirements at a temperature of -162° C. and should also have anti-magnetic properties, such as aluminum alloy.

[0016] Furthermore, piston rings are installed inside the horizontal piston 6 and the vertical piston 7 in the closed support shell 3, so that the horizontal piston 6 and the vertical piston 7 have sliding ability while ensuring the sealing of the six closed spaces surrounded by the closed support shell 3.

[0017] Furthermore, lubricating oil may be added between the horizontal piston 6 and its internal copper block 66 to reduce friction.

[0018] Furthermore, the composite metal blades 67 inside the horizontal piston 6 are made of a lightweight and high-strength conductive material, such as aluminum alloy, to generate heat and achieve energy consumption.

[0019] Furthermore, the size of the large LNG storage tank sway reduction device can be adjusted according to requirements, and several devices can be placed in the LNG storage tank.

[0020] The use process of the present invention is:

[0021] When an earthquake occurs, the liquid stored in the large LNG storage tank shakes, causing the liquid in the liquid-filled ball 1 to shake in the opposite direction. At this time, the liquid-filled ball can be regarded as a liquid frequency-modulated damper (TLD). Due to the flexible nature of the liquid, the liquid level of the large LNG storage tank will shake up and down, causing the stored liquid to impact the bottom of the liquid-filled ball 1, generating tension on the steel strand 2. The tension is transmitted to the vertical piston 7, which transmits the force to the gas spring 4 through the vertical piston 7. At this time, the gas spring 4, the vertical piston 7 and the steel strand 2 all undergo vertical displacement, causing the sleeve of the ball screw 5 to produce vertical displacement. Because the bottom of the ball screw 5's lever is vertically fixed to the inner bottom surface of the sealed support housing 3, the sleeve of the ball screw 5, whose first roller 21 is fixed to the bottom surface of the vertical piston 7, will rotate when it produces vertical displacement, and the fan blades installed on the sleeve will rotate, forming consumption damping.

[0022] At the same time, since the entire sealed support housing 3 is sealed, the six sealed spaces divided by the pistons are in a state of pressure equilibrium under initial conditions. When the vertical piston 7 is displaced, the vertical piston 7 will first break this equilibrium state, and the entire system will be in an unbalanced state, thereby causing the horizontal piston 6 to be horizontally displaced in the horizontal slide. The north poles of the magnet 23 fixed to the sealed support housing 3 and the steel mesh 22 and the first annular magnet 61 fixed to the inner side of the left and right end surfaces of the horizontal piston 6 are opposite. When the horizontal piston 6 slides inside the horizontal piston, the magnet 23 and the first annular magnet 61 will approach each other to generate a repulsive force, thereby intensifying the movement of the horizontal piston 6 in the horizontal slide. At the same time, the third annular magnet 65 and the copper block 66 placed inside the horizontal piston 6 will undergo relative displacement with the horizontal piston 6 due to inertia. The first annular magnet 61 fixed on the inner sides of the left and right end surfaces of the horizontal piston 6 is opposite to the S pole of the third annular magnet 65 embedded in the copper block 66. When the distance between the two becomes smaller, a repulsive force is generated, thereby intensifying the relative movement between the horizontal piston 6 and the internal copper block 66 and the third annular magnet 65.

[0023] Because the lead screw of ball screw 63 is vertically fixed to the left and right end surfaces of horizontal piston 6, and the sleeve of ball screw 63 is fixed to the assembly of third annular magnet 65 and copper block 66, the relative motion between horizontal piston 6, internal copper block 66, and third annular magnet 65 is transformed into motion between the lead screw of ball screw 63 and the sleeve, causing the sleeve to rotate and the composite metal blades 67 fixed to the sleeve to begin rotating. A second annular magnet 62 is mounted on the side of horizontal piston 6 and is radially magnetized, with the N and S poles divided into two semi-circular cylinders. The composite metal blades 67 rotate in the magnetic field generated by the second annular magnet 62, generating damping and dissipating energy. Simultaneously, the movement of copper block 66 in the magnetic field also generates damping and consumes energy. Beneficial effects

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1) The sway reduction device provided by this invention utilizes the counter-movement of the liquid in the upper liquid-filled sphere relative to the liquid in the tank. The sphere at the liquid surface acts as a TLD. Due to the flexible nature of the liquid, the liquid surface oscillates, generating tension in the steel strands. This tension then causes the gas spring below to vertically displace and provide restoring force. This simple principle is practical and efficient. Simultaneously, the vertical displacement of the gas spring drives the blades of the sleeve of the lower ball screw to rotate in the damping fluid, dissipating energy.

[0026] 2) The sway reduction device provided by this invention utilizes hydraulic drive instead of the traditional mechanical piston drive. When pressure imbalance occurs, the horizontal piston undergoes horizontal displacement, increasing its flexibility. Magnets are placed within the horizontal slideway and piston to enhance the piston's movement and the relative motion between the piston and its internal components, making the sway reduction device more energy efficient. When the piston moves outward from the slideway, it facilitates the retraction of the gas spring, creating mutually beneficial interactions between the system components.

[0027] 3) The present invention has a simple structure and is easy to install. Through the synergistic effect of multiple energy-consuming technologies, it has high energy-consuming efficiency and can reduce the impact of earthquakes on large LNG storage tank structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic structural diagram of a large-scale LNG storage tank sway reduction device according to the present invention.

[0029] FIG2 is a schematic structural diagram of the combined support in the present invention.

[0030] FIG3 is a top view of FIG2 .

[0031] FIG4 is a schematic diagram of the structure of a gas spring.

[0032] FIG5 is a schematic structural diagram of the horizontal piston in the present invention.

[0033] FIG6 is a schematic structural diagram of a roller connection.

[0034] In the figure: 1 liquid-filled ball, 2 steel strand, 3 sealed support housing, 4 gas spring, 5 ball screw, 6 horizontal piston, 7 vertical piston;

[0035] 21 first roller, 22 steel mesh, 23 magnet;

[0036] 61 first annular magnet, 62 second annular magnet, 63 ball screw, 64 second roller, 65 third annular magnet, 66 copper block, 67 composite metal fan blade. Modes for Carrying Out the Invention

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but is not limited to the contents of the description. Example

[0038] This embodiment provides a large LNG storage tank sway reduction device, including a liquid-filled ball 1, a steel strand 2, a sealed support housing 3, a gas spring 4, a ball screw 5, a horizontal piston 6, and a vertical piston 7.

[0039] As shown in Figures 1, 2, 3, and 4, in a large LNG storage tank,

[0040] The liquid-filled ball 1 is a closed hollow ball filled with damping liquid. The damping liquid should preferably be a liquid with a lower density than the LNG storage liquid, occupying half of the volume of the sphere so that it floats on the LNG liquid surface. Nine-nickel steel with stable properties in the LNG storage liquid is selected as the hollow shell material of the liquid-filled ball 1. The steel strand 2 is used to connect the liquid-filled ball 1 and the vertical piston 7. The upper end is fixed to the bottom of the liquid-filled ball 1, and the lower end is fixed to the semicircular ring buckle of the vertical piston 7. The closed support shell 3 includes two parts, a horizontal structure and a vertical structure. It is an integrated structure fixed to the bottom of the LNG storage tank. The horizontal structure is composed of two hollow slender cylindrical structures arranged along a "cross shape", which is called a horizontal slide. The vertical structure is arranged at the central intersection. The vertical structure is also a hollow slender cylindrical structure, also called a vertical slide. The radius of the vertical slide is twice the radius of the horizontal slide. The sealed support housing 3 is divided into four perpendicular horizontal slideways and one vertical slideway by welding four sets of steel mesh 22 at the interface between the internal horizontal and vertical structures. The steel mesh 22 prevents the horizontal piston from disengaging from the channel, and magnets 23 are mounted on the sealed support housing 3 and the steel mesh 22. Four horizontal pistons 6 are installed in the four horizontal slideways of the sealed support housing 3. The lower half of the vertical piston 7, a cylindrical piston, is placed in the vertical slideway of the sealed support housing 3. The lower base of the cylindrical connecting rod in the upper half is perpendicularly fixed to the upper surface of the cylindrical piston, extending upward through the outer surface of the sealed support housing 3 and out of the combined support. A semicircular ring is provided at its end. The lower end of the steel strand 2 is fixed to the semicircular ring in the upper half of the vertical piston 7. The lower base of the vertical piston 7 is connected to the ball screw 5 and the gas spring 4. The vertical piston 7 and the four horizontal pistons 6 together divide the sealed support housing 3 into six enclosed spaces, and the middle enclosed space is filled with damping fluid. The six enclosed spaces are: a enclosed space between the upper surface of the cylindrical piston of the vertical piston 7 and the top of the vertical structure, four enclosed spaces between the four horizontal pistons 6 and the inner side of the horizontal structure, and a enclosed space between the bottom surface of the vertical piston 7 and the inner sides of the four horizontal pistons.

[0041] As shown in Figure 5, the horizontal piston 6 is a hollow cylinder, with a total of four, which are respectively installed in the four horizontal slides in the closed support housing 3; the upper and lower bottom surfaces, that is, the left and right end surfaces and side surfaces of the horizontally installed hollow cylinder are installed with a first annular magnet 61 and a second annular magnet 62, and the magnetic poles of the second annular magnet 62 are radially magnetized, that is, the magnetic poles N and S are divided into two semi-circular cylinders; a ball screw 63 is arranged inside, and the ends of the wire lever of the ball screw 63 are respectively fixed vertically to the left and right end surfaces of the horizontal piston 6, and the sleeve of the ball screw 63 can move on the wire lever, and the fan blades are installed on the sleeve. The third annular magnet 65 is installed at both ends of the sleeve, and the S poles of the first annular magnet 61 and the second annular magnet 65 are opposite, so that repulsion is generated when they are close. The third annular magnet 65 is wrapped with a copper block 66, which acts as a bracket to keep the sleeve of the ball screw 63 horizontal and increase the quality of the internal structure. It has anti-magnetic properties and is not affected by the second annular magnet 62, which is conducive to horizontal movement. At the same time, the movement of the copper block 66 will generate heat and consume energy.

[0042] As shown in Figure 6 , the connection between the sleeve of the ball screw 5 and the vertical piston 7 is as follows: the sleeve of the ball screw 5 is fixed to the shaft ring of the first roller 21, and the vertical piston 7 is fixed to the roller's seat ring. The two do not contact each other, that is, the rotation of the sleeve of the ball screw 5 and the vertical displacement of the vertical piston 7 do not affect each other. This figure also applies to the connection between the sleeve of the second roller 64 and the sleeve of the ball screw 63. The shaft ring of the second roller 64 is fixed to the sleeve of the ball screw 63, and the seat ring is fixed to the third annular magnet 65. The sleeve of the ball screw 63 and the third annular magnet 65 do not contact each other, ensuring that the translation of the magnet does not affect the rotation of the sleeve.

[0043] When an earthquake occurs, the liquid stored in the large LNG storage tank will shake, causing the liquid in the liquid-filled ball 1 to shake in the opposite direction. At this time, the liquid-filled ball can be regarded as a TLD. Due to the flexible nature of the liquid, the liquid level of the large LNG storage tank will shake up and down, so that the stored liquid will impact the bottom of the liquid-filled ball 1, causing tension on the steel strand 2. The tension is transmitted to the vertical piston 7, and the force is transmitted to the gas spring 4 through the vertical piston 7. At this time, the gas spring 4, the vertical piston 7 and the steel strand 2 will undergo vertical displacement together. The ball screw 5's wire lever is vertically fixed to the inner side of the bottom surface of the closed support housing 3. Therefore, the sleeve of the ball screw 5 with the first roller 21 fixed to the bottom of the vertical piston 7 will rotate when vertical displacement occurs, and the fan blades will rotate, forming consumption damping. Since the entire sealed support housing 3 is sealed, the pressures in the six sealed spaces divided by the pistons are in equilibrium under initial conditions. When the vertical piston 7 is displaced, the vertical piston 7 will first break this equilibrium, and the entire system will be in an unbalanced state, causing the horizontal piston 6 to be horizontally displaced in the horizontal slide. The north poles of the magnet 23 fixed to the sealed support housing 3 and the steel mesh 22 and the first annular magnet 61 fixed to the inner sides of the left and right end faces of the horizontal piston 6 are opposite. When the horizontal piston 6 slides inside the horizontal piston, the magnet 23 and the first annular magnet 61 will approach each other to generate a repulsive force, thereby intensifying the movement of the horizontal piston 6 in the horizontal slide. At the same time, the third annular magnet 65 and copper block 66 placed inside the horizontal piston 6 will undergo relative displacement with the horizontal piston 6 due to inertia. The first annular magnet 61 fixed to the inner side of the left and right end surfaces of the horizontal piston 6 and the south pole of the third annular magnet 65 embedded in the copper block 66 are facing each other. When the distance between the two decreases, a repulsive force is generated, thereby intensifying the relative movement between the outer shell of the horizontal piston 6 and the internal copper block 66 and the third annular magnet 65. The ends of the ball screw 63 are respectively fixed vertically to the left and right end surfaces of the horizontal piston 6, and the sleeve of the ball screw 63 is fixed to the assembly of the third annular magnet 65 and the copper block 66. In other words, the relative movement between the horizontal piston 6 and the internal copper block 66 and the third annular magnet 65 is transformed into relative movement between the ball screw 63's lever and the sleeve, causing the sleeve to rotate and the composite metal fan blade 67 fixed to the sleeve to begin to rotate. A second annular magnet 62 is installed on the side of the horizontal piston 6 and radial magnetization is adopted, that is, the magnetic poles N and S are divided into two semi-circular cylinders. The composite metal fan blades 67 rotate in the magnetic field to generate damping and dissipate energy. At the same time, the copper block 66 itself also generates damping and consumes energy when moving in the magnetic field.

[0044] In this embodiment, utilizing existing technology, the connection between the vertical piston 7 and the vertical structural top surface of the sealed support housing 3 must ensure good sealing, ensuring that the straight rod can pass freely through the sealed support housing 3 while ensuring the airtightness of the sealed support housing 3. The material selected for the sealed support housing 3 should meet the strength requirements at a temperature of -162°C and have anti-magnetic properties, such as aluminum alloy.

[0045] The initial condition of the present invention is to control the gas spring 4 so that the horizontal piston 6 is squeezed by the damping fluid and close to the outside of the slideway. Under this condition, when the gas spring 4 is subjected to a vertical upward pulling force, the upper part of the gas spring still has the ability to move upward.

[0046] The above-described embodiments merely express the implementation methods of the present invention, but should not be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, they can make several modifications and improvements, which should also fall within the scope of protection of the present invention.

Claims

1. A liquid-filled ball rebound composite electromagnetic energy-consuming large LNG storage tank sway reduction device, characterized in that: The sloshing reduction device is installed inside the tank of a large LNG storage tank, which can reduce the height of the liquid surface sloshing wave and reduce the amplitude of liquid sloshing. The LNG storage tank sway reduction device comprises: a liquid-filled ball (1), a steel strand (2) arranged below the liquid-filled ball (1), a sealed support housing (3), a gas spring (4), a ball screw (5), a horizontal piston (6), and a vertical piston (7); The liquid-filled ball (1) is a closed hollow ball filled with damping liquid and capable of floating on the liquid surface in the LNG storage tank; the steel strand (2) is used to connect the liquid-filled ball (1) and the vertical piston (7), that is, the upper end of the steel strand (2) is fixed below the liquid-filled ball (1), and the lower end is fixed to the top of the vertical piston (7); The enclosed support shell (3) comprises a horizontal structure and a vertical structure, which are an integrated structure and are fixed to the bottom surface of the LNG storage tank. The horizontal structure is formed by two hollow slender cylindrical structures arranged along a "cross shape" and is defined as a horizontal slide. The vertical structure is arranged at the central intersection, and the vertical structure is also a hollow slender cylindrical structure and is defined as a vertical slide. By welding a steel mesh (22) at the interface between the horizontal structure and the vertical structure inside the enclosed support shell (3), the enclosed support shell (3) is divided into four directions of two perpendicular horizontal slides and a vertical slide perpendicular to the plane where the horizontal slides are located. The vertical piston (7) is placed in the vertical slide of the closed support shell (3), the upper end extends out of the vertical slide and is connected to the connecting steel strand (2), and the lower end is connected to the ball screw (5) and the gas spring (4). The gas spring (4) is used to prevent the vertical piston (7) from escaping from the vertical slide, ensuring the normal operation of the device, and at the same time providing elastic restoring force for the liquid-filled ball (1). The fan blades are installed on the sleeve of the ball screw (5); there are four horizontal pistons (6), which are respectively installed in the four horizontal slides in the closed support shell (3); the vertical piston (7) and the four horizontal pistons (6) together divide the closed support shell (3) into six closed spaces, the middle closed space is filled with damping liquid, and the piston fits the wall of the slide but is not fixed and can move.

2. The liquid-filled ball rebound composite electromagnetic energy-consuming large-scale LNG storage tank sway reduction device according to claim 1 is characterized in that: The horizontal piston (6) in the horizontal slideway has the following structure: The horizontal piston (6) is a hollow cylinder, which is arranged horizontally. The left and right end surfaces of the horizontal piston (6) are both mounted with a first annular magnet (61), and the side surfaces are mounted with a second annular magnet (62). The second annular magnet (62) is radially magnetized, and the radial magnetization means that the magnetic poles N and S are divided into two semi-circular cylinders. A horizontally arranged ball screw (63) is provided inside the horizontal piston (6). The two ends of the wire lever of the ball screw (63) are respectively fixed vertically to the left and right end surfaces of the horizontal piston (6). The sleeve of the ball screw (63) can move on the wire lever. A composite metal fan blade (67) is mounted on the sleeve. A third annular magnet (65) is mounted on both ends of the sleeve, and the first annular magnet (61) and the third annular magnet ( The S poles of the third annular magnet (65) are opposite to each other, so that repulsion is generated when they are close to each other; the third annular magnet (65) is wrapped with a copper block (66); the sleeve of the ball screw (63) and the third annular magnet (65) are connected by a second roller (64), the sleeve of the ball screw (63) is fixed to the shaft ring of the second roller (64), and the third annular magnet (65) is fixed to the seat ring of the second roller (64), and the two do not contact each other, so that the third annular magnet (65) will not affect the rotation of the sleeve of the ball screw (63) when it moves horizontally; magnets (23) are set at both ends of the horizontal slide of the closed support shell (3), the outer end is fixed to the inner wall of the closed support shell (3), and the inner end is fixed to the steel mesh (22).

3. The liquid-filled ball rebound type composite electromagnetic energy-consuming large LNG storage tank sway reduction device according to claim 2 is characterized in that: The magnet (23) and the first annular magnet (61) installed on the left and right end surfaces of the horizontal piston (6) have their N poles facing each other; the first annular magnet (61) fixed on the inner sides of the left and right end surfaces of the horizontal piston (6) has its S pole facing each other and the third annular magnet (65) embedded in the copper block (66) has its S pole facing each other.

4. The liquid-filled ball rebound type composite electromagnetic energy-consuming large LNG storage tank sway reduction device according to claim 1 is characterized in that: Piston rings are installed inside the horizontal piston (6) and the vertical piston (7) in the sealed support housing (3), so that the horizontal piston (6) and the vertical piston (7) have sliding ability while ensuring the sealing between them and the sealed support housing (3).

5. The liquid-filled ball rebound type composite electromagnetic energy dissipation large LNG storage tank sway reduction device according to claim 1 is characterized in that: The radius of the vertical slideway is twice the radius of the horizontal slideway.

6. The liquid-filled ball rebound type composite electromagnetic energy dissipation large LNG storage tank sway reduction device according to claim 1 is characterized in that: The upper end of the gas spring (4) in the vertical slide is fixed to the lower bottom surface of the vertical piston (7), and the lower end is fixed to the inner side of the bottom surface of the closed support shell (3); the upper end of the ball screw (5) is fixed to the lower bottom surface of the vertical piston (7), and the lower end is fixed to the inner side of the bottom surface of the closed support shell (3); the ball screw (5) and the vertical piston (7) are connected by a first roller (21), the sleeve of the ball screw (5) is fixed to the shaft ring of the first roller (21), and the vertical piston (7) is fixed to the seat ring of the first roller (21). There is no contact between the ball screw (5) and the vertical piston (7), so that the rotation of the sleeve of the ball screw (5) and the vertical displacement of the vertical piston (7) do not affect each other.

7. The liquid-filled ball rebound type composite electromagnetic energy-consuming large LNG storage tank sway reduction device according to claim 1 is characterized in that: The size of large LNG storage tank sway reduction devices is adjusted according to requirements, and several devices are placed in the LNG storage tank.

8. The liquid-filled ball rebound type composite electromagnetic energy dissipation large LNG storage tank sway reduction device according to claim 2 is characterized in that: When an earthquake occurs, the liquid stored in large LNG storage tanks shakes: The liquid level of the storage liquid shakes up and down, impacting the bottom of the liquid-filled ball (1), causing the steel strand (2) to generate tension, which is transmitted to the gas spring (4) through the vertical piston (7). At this time, the gas spring (4), the vertical piston (7) and the steel strand (2) are vertically displaced together, thereby driving the sleeve of the ball screw (5) to generate vertical displacement; since the bottom of the ball screw (5) is vertically fixed to the inner side of the bottom surface of the closed support housing (3), the sleeve of the ball screw (5) will rotate when generating vertical displacement, and the fan blades installed on the sleeve will rotate, forming consumption damping; At the same time, since the entire sealed support housing (3) is sealed, the sealed space is in a balanced state under initial conditions. When the vertical piston (7) is displaced along with the gas spring (4), the vertical piston (7) first breaks this balanced state, and the entire system is in an unbalanced state, thereby causing the horizontal piston (6) to be horizontally displaced in the horizontal slideway; the N poles of the magnet (23) fixed on the sealed support housing (3) and the steel mesh (22) and the first annular magnet (61) fixed on the inner sides of the left and right end faces of the horizontal piston (6) are opposite. When the horizontal piston (6) slides in the horizontal piston, the magnet (23) and the first annular magnet (61) are opposite. The annular magnets (61) will approach to generate a repulsive force, thereby intensifying the movement of the horizontal piston (6) in the horizontal slideway; at the same time, the third annular magnet (65) and the copper block (66) placed inside the horizontal piston (6) will be relatively displaced with the shell of the horizontal piston (6) due to inertia. The first annular magnet (61) fixed on the inner side of the left and right end surfaces of the horizontal piston (6) and the S pole of the third annular magnet (65) embedded in the copper block (66) are opposite. When the distance between the two becomes smaller, a repulsive force will be generated, thereby intensifying the relative movement between the horizontal piston (6) and the internal copper block (66) and the third annular magnet (65); Since the wire lever of the ball screw (63) is vertically fixed on the left and right end surfaces of the horizontal piston (6), the sleeve of the ball screw (63) is fixed on the third annular magnet (65) and the copper block (66), the wire lever of the ball screw (63) drives the sleeve thereon to rotate, and the composite metal fan blade (67) fixed on the sleeve starts to rotate; the second annular magnet (62) is installed on the side of the cylinder wall of the horizontal piston (6), and the second annular magnet (62) is radially magnetized. The composite metal fan blade (67) rotates in the magnetic field generated by the second annular magnet (62) to generate damping and dissipate energy. At the same time, the copper block (66) itself also generates damping and consumes energy when moving in the magnetic field.

Images