WO2025200085A1 - 一种充液球回弹式复合电磁耗能大型lng储罐减晃装置 - Google Patents

一种充液球回弹式复合电磁耗能大型lng储罐减晃装置

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Publication number
WO2025200085A1
WO2025200085A1 PCT/CN2024/091472 CN2024091472W WO2025200085A1 WO 2025200085 A1 WO2025200085 A1 WO 2025200085A1 CN 2024091472 W CN2024091472 W CN 2024091472W WO 2025200085 A1 WO2025200085 A1 WO 2025200085A1
Authority
WO
WIPO (PCT)
Prior art keywords
horizontal
piston
liquid
vertical
annular magnet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/091472
Other languages
English (en)
French (fr)
Inventor
赵懿
杨轲
李宏男
崔苗
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dalian University of Technology
Guangxi University
Original Assignee
Dalian University of Technology
Guangxi University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dalian University of Technology, Guangxi University filed Critical Dalian University of Technology
Priority to US18/964,199 priority Critical patent/US20250129897A1/en
Publication of WO2025200085A1 publication Critical patent/WO2025200085A1/zh
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/022—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using dampers and springs in combination
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/03—Control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact

Definitions

  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • lubricating oil may be added between the horizontal piston 6 and its internal copper block 66 to reduce friction.
  • 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.
  • the use process of the present invention is:
  • 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.
  • 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.
  • TLD liquid frequency-modulated damper
  • 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.
  • 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.
  • 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.
  • the sway reduction device 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.
  • the sway reduction device provided by this invention utilizes hydraulic drive instead of the traditional mechanical piston drive.
  • 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.
  • the piston moves outward from the slideway, it facilitates the retraction of the gas spring.
  • the system components complement each other and provide mutual benefits.
  • FIG1 is a schematic structural diagram of a large-scale LNG storage tank sway reduction device according to the present invention.
  • FIG2 is a schematic structural diagram of the combined support in the present invention.
  • FIG3 is a top view of FIG2 .
  • FIG4 is a schematic diagram of the structure of a gas spring.
  • FIG5 is a schematic structural diagram of the horizontal piston in the present invention.
  • FIG6 is a schematic structural diagram of a roller connection.
  • 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.
  • 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 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the copper block 66 itself also generates damping and consumes energy when moving in the magnetic field.
  • 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.
  • 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 approaches 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.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Electromagnetism (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

一种充液球回弹式复合电磁耗能大型LNG储罐减晃装置，安装在罐体内部，包括充液球和布置于充液球下方的钢绞线、密闭支座外壳、气弹簧、滚珠丝杠、水平活塞、竖向活塞。当液面发生晃动时，气弹簧由钢绞线拉动产生竖向位移并提供恢复力，气弹簧竖向位移带动底部滚珠丝杠的套筒上的扇叶在阻尼液中转动，消耗能量。使用液压传动代替传统活塞运动的机械传动，压强不平衡时水平活塞发生水平位移，增加水平活塞运动的灵活性；水平滑道内和水平活塞内布置磁铁，加剧水平活塞的运动和水平活塞与内部之间的相对运动，耗能更加高效；结构简单，便于安装，系统部件相辅相成，通过多项耗能技术协同配合，耗能效率高，可减小因地震对大型LNG储罐结构的影响。

Description

一种充液球回弹式复合电磁耗能大型LNG储罐减晃装置 技术领域
本发明属于阻尼减震技术领域，尤其属于大型LNG储罐储液减晃技术领域，涉及一种电磁耗能的大型LNG储罐减晃装置。
 背景技术
LNG是天然气经压缩、冷却至-162℃后变成的液体，相比于传统的煤炭、石油，LNG是一种更清洁、高效的绿色能源。LNG储罐涉及城市重大生命线工程技术领域，其抵御地震等自然灾害的能力是该设施重要参考指标，储罐在地震作用下，会引起储罐功能丧失，引发火灾或爆炸，危及周围区域的人员和财产安全，造成严重的经济损失。
地震作用下，LNG储罐内液体会发生晃荡，对储罐罐壁造成附加的动水压力，影响储罐结构的安全性。晃动的液体还有可能对吊顶产生直接的冲击，造成管道接头及其附件的破坏。为降低LNG储罐地震响应，采用基础隔震，研究发现隔震系统能够有效降低储罐结构的地震响应，但隔震后可能会引起液体的晃动波高的增大，使液面晃动加剧。因此，为了保证储罐结构的安全性，需要设计出一种能够有效降低储液晃动波高的装置，来解决现有实际问题。
 技术问题
本发明提供一种在大型LNG储罐中能够有效降低液面晃动波高的减晃装置，能够显著减小液体晃动幅度，从而减弱因地震引起的液面晃动对储罐结构的影响。
 技术解决方案
为了达到上述目的，本发明采用的技术方案为：
一种充液球回弹式复合电磁耗能大型LNG储罐减晃装置，安装在LNG储罐的罐体内部，LNG储罐减晃装置包括：充液球1和布置于充液球1下方的钢绞线2、密闭支座外壳3、气弹簧4、滚珠丝杠5、水平活塞6、竖向活塞7。
所述的充液球1是密闭空心球，其内部填充阻尼液，阻尼液宜选较于LNG储液密度较低的液体，占据球体的一半容积，使其能够浮在LNG储罐内液面上；所述的钢绞线2用于连接充液球1和竖向活塞7，即钢绞线2的上端固定于充液球1下方，下端固定于竖向活塞7顶部的半圆环扣上。
所述的密闭支座外壳3包括水平结构和垂直结构两部分，为一体结构，固定在LNG储罐底面，水平结构由两个中空的细长圆柱体结构沿“十字形”布置而成，定义为水平滑道，其中心交点处布置垂直结构，垂直结构也为中空的细长圆柱体结构，定义为竖向滑道，其中竖向滑道的半径是水平滑道半径的两倍。通过在密闭支座外壳3内部水平结构和垂直结构交界面处焊接四组钢筋网22，将密闭支座外壳3划分为四个方向两两垂直水平滑道和一个垂直于水平滑道所在平面的竖向滑道。
所述的气弹簧4位于竖向滑道内，其上端固定于竖向活塞7的下底面，下端固定在密闭支座外壳3的底面内侧，气弹簧4用于防止竖向活塞7脱离竖向滑道，保证装置正常运行，同时为充液球1提供弹性恢复力。所述的滚珠丝杠5位于竖向滑道内，其套筒上安装扇叶，与气弹簧4安装位置相同，其上端都固定于竖向活塞7的下底面，下端都固定在密闭支座外壳3的底面内侧；所述的滚珠丝杠5上端与竖向活塞7之间采用第一滚轴21连接，滚珠丝杠5的套筒固定于第一滚轴21的轴圈，竖向活塞7固定于第一滚轴21的座圈，滚珠丝杠5与竖向活塞7之间不发生接触，即滚珠丝杠5的套筒的转动与竖向活塞7的竖向位移互不影响。
所述的水平活塞6为空心圆柱体，共四个，分别安装在密闭支座外壳3中的四个水平滑道内；空心圆柱体水平布置，其左右两端面均安装第一磁铁61，侧面安装第二环形磁铁62，第二环形磁铁62的磁极采用径向充磁，即磁极N、S分为两个半圆环柱体。水平活塞6内部设有水平布置有滚珠丝杠63，滚珠丝杠63的丝杠杆两端分别垂直固定于水平活塞6的左右两端面，滚珠丝杠63的套筒可在丝杠杆上移动，套筒上安装复合金属扇叶67，套筒两端均安装第三环形磁铁65，且第一环形磁铁61与第三环形磁铁65的S极相对，使其靠近时产生斥力。第三环形磁铁65周围采用铜块66包裹，铜块66起支架作用使滚珠丝杠63的套筒保持水平，并增加内部结构质量，且具有抗磁性，不受第二环形磁铁62的影响，利于水平运动，同时铜块66本身在磁场中运动也会产生阻尼，消耗能量。滚珠丝杠63的套筒与第三环形磁铁65之间采用第二滚轴64连接，滚珠丝杠63的套筒固定于第二滚轴64的轴圈，第三环形磁铁65固定于第二滚轴64的座圈，两者不发生接触，使第三环形磁铁65水平移动时不会影响滚珠丝杠63的套筒的转动。
所述的竖向活塞7下半部分即圆柱形活塞放置在密闭支座外壳3的竖向滑道中，上半部分的圆柱形连杆的下底面垂直固定在圆柱形活塞上表面，向上通过密闭支座外壳3外表面伸出组合支座外，在其末端设置半圆环扣。钢绞线2下端固定于竖向活塞7上半部分的半圆环扣上，竖向活塞7的下底面与滚珠丝杠5、气弹簧4连接。竖向活塞7和四个水平活塞6一同将密闭支座外壳3划分成六个密闭空间，中间密闭空间填充阻尼液。活塞与滑道壁面贴合但不固定，能够移动。所述的六个密闭空间分别为：竖向活塞7的圆柱形活塞上表面与垂直结构顶部之间的一个密闭空间，四个水平活塞6与水平结构内侧之间的四个密闭空间，竖向活塞7底部与四个水平活塞内侧之间的一个密闭空间。
所述的密闭支座外壳3水平滑道与竖向滑道垂直相交的位置安装竖向钢筋网22，防止水平活塞6脱离水平滑道。所述的密闭支座外壳3的水平滑道两端设置磁铁23，两组磁铁23分别固定在钢筋网22和密闭支座外壳3上。
进一步的，滚珠丝杠63的丝杠杆通过第一环形磁铁61、第二环形磁铁62、第三环形磁铁63的内圈分别垂直固定于水平活塞6的左右两端面，且这些环形磁铁的内圈直径略大于丝杠杆直径。
进一步的，所述的磁铁23的N极与水平活塞6左右端面安装的第一环形磁铁61的N极相对。
进一步的，密闭支座外壳3所选用的材料应满足在-162℃的温度条件下满足强度要求的同时应具有抗磁性，例如铝合金等。
进一步的，在密闭支座外壳3中水平活塞6和竖向活塞7内侧安装活塞环，使水平活塞6和竖向活塞7在具有滑动能力的同时保证其与密闭支座外壳3所围成的六个密闭性空间的密封性。
进一步的，水平活塞6与其内部铜块66之间可加润滑油来减小摩擦。
进一步的，水平活塞6内部的复合金属扇叶67采用轻质高强导电材料，如铝合金，产生热量，实现耗能。
进一步的，大型LNG储罐减晃装置可根据要求调整尺寸，在LNG储罐中放置若干个。
本发明的使用过程为：
当发生地震时，大型LNG储罐内储液发生晃动，带动充液球1中液体发生反方向晃动，此时充液球可看作为液体调频阻尼器(TLD)。由于液体的柔性性质，大型LNG储液液面会发生上下晃动，从而储液会冲击充液球1的底部使得钢绞线2上产生拉力，拉力传至竖向活塞7，通过竖向活塞7将力传递至气弹簧4，此时气弹簧4、竖向活塞7和钢绞线2一起发生竖向位移，带动滚珠丝杠5的套筒产生竖向位移。由于滚珠丝杠5的丝杠杆底部垂直固定在密闭支座外壳3底面内侧，因此第一滚轴21固定在竖向活塞7底面的滚珠丝杠5的套筒在产生竖向位移时会发生转动，套筒上安装的扇叶旋转，形成消耗阻尼。
同时，由于整个密闭支座外壳3是密闭的，由活塞划分的6个密闭空间在初始条件下压强处于平衡状态，当竖向活塞7发生位移时，竖向活塞7会首先打破这个平衡状态，整个系统会处于一个不平衡状态，从而引起水平活塞6在水平滑道中发生水平位移。固定在密闭支座外壳3、钢筋网22上的磁铁23和固定在水平活塞6左右端面内侧的第一环形磁铁61的N极相对，当水平活塞6在水平活塞内滑动时，磁铁23和第一环形磁铁61会靠近产生斥力，从而加剧水平活塞6在水平滑道中的运动。同时水平活塞6内部放置的第三环形磁铁65和铜块66，由于惯性两者会与水平活塞6发生相对位移，固定在水平活塞6左右端面内侧的第一环形磁铁61与铜块66上内嵌的第三环形磁铁65的S极相对，当两者之间的距离变小时会产生斥力，从而加剧水平活塞6和内部铜块66、第三环形磁铁65之间的相对运动。
由于滚珠丝杠63的丝杠杆垂直固定在水平活塞6的左右端面上，滚珠丝杠63的套筒固定第三环形磁铁65和铜块66的组合件上，即水平活塞6和内部铜块66和第三环形磁铁65之间的相对运动演变为滚珠丝杠63的丝杠杆和套筒之间的运动，从而套筒发生旋转，固定在套筒上的复合金属扇叶67开始转动。水平活塞6侧面安装第二环形磁铁62并且采用径向充磁，即磁极N、S分为两个半圆环柱体，复合金属扇叶67在第二环形磁铁62产生的磁场中旋转产生阻尼，耗散能量，同时铜块66本身在磁场运动也会产生阻尼，消耗能量。
 有益效果
与现有技术相比，本发明的有益效果为：
1）本发明提供的减晃装置利用上方充液球中的液体会与储罐储液发生反向运动，液面处的充液球充当了TLD。由于液体的柔性性质，液面会发生上下晃动，使得钢绞线产生拉力，下方气弹簧会因拉力的存在产生竖向位移并提供恢复力，原理简单，实用高效。同时，气弹簧的竖向位移会带动底部滚珠丝杠的套筒上的扇叶在阻尼液中转动，消耗能量。
2）本发明提供的减晃装置使用液压传动代替传统活塞运动的机械传动，压强不平衡时水平活塞发生水平位移，增加水平活塞运动的灵活性。水平滑道内和水平活塞内布置磁铁，加剧了水平活塞的运动和水平活塞与内部之间的相对运动，使减晃装置耗能更加高效。当水平活塞向水平滑道外侧移动时有利于气弹簧的回收，系统部件相辅相成，互有益处。
3）本发明结构简单便于安装，通过多项耗能技术协同作用，耗能效率高，可减小因地震对大型LNG储罐结构的影响。
 附图说明
图1为本发明的大型LNG储罐减晃装置的结构示意图。
图2为本发明中组合支座的结构示意图。
图3为图2的俯视图。
图4为气弹簧的结构示意图。
图5为本发明中水平活塞的结构示意图。
图6为滚轴连接的结构示意图。
图中：1充液球，2钢绞线，3密闭支座外壳，4气弹簧，5滚珠丝杠，6水平活塞，7竖向活塞；
21第一滚轴，22钢筋网，23磁铁；
61第一环形磁铁，62第二环形磁铁，63滚珠丝杠，64第二滚轴，65第三环形磁铁，66铜块，67复合金属扇叶。
 本发明的实施方式
下面结合附图和具体实施方式对本发明的内容做进一步详细说明，但不仅仅局限于说明书上的内容。
实施例
本实施例提供一种大型LNG储罐减晃装置，包括充液球1，钢绞线2，密闭支座外壳3，气弹簧4，滚珠丝杠5，水平活塞6，竖向活塞7。
如图1、2、3、4所示，在大型LNG储罐内，
所述的充液球1是密闭空心球其内部填充阻尼液，阻尼液宜选较于LNG储液密度较低的液体，占据球体的一半容积，使其浮在LNG液面上，选用在LNG储液中性质稳定的九镍钢作为充液球1空心外壳材料。所述的钢绞线2用于连接充液球1和竖向活塞7，上端固定于充液球1的下方，下端固定于竖向活塞7的半圆环扣上。所述的密闭支座外壳3包括水平结构和垂直结构两部分，为一体结构，固定在LNG储罐底面，水平结构由两个中空的细长圆柱体结构沿“十字形”布置而成，称为水平滑道，其中心交点处布置垂直结构，垂直结构也为中空的细长圆柱体结构，也叫做竖向滑道，竖向滑道的半径是水平滑道半径的两倍。通过在内部水平结构和垂直结构的交界面处焊接四组钢筋网22把密闭支座外壳3划分为四个方向两两垂直水平滑道和一个竖向滑道，钢筋网22防止水平活塞脱离孔道，并在密闭支座外壳3和钢筋网22上安装磁铁23。所述的水平活塞6共四个，分别安装在密闭支座外壳3中的四个水平滑道内。所述的竖向活塞7下半部分即圆柱形活塞放置在密闭支座外壳3的竖向滑道中，上半部分的圆柱形连杆的下底面垂直固定在圆柱形活塞上表面，向上通过密闭支座外壳3外表面伸出组合支座外，并在其末端设置半圆环扣。钢绞线2下端固定于竖向活塞7上半部分的半圆环扣上，竖向活塞7的下底面与滚珠丝杠5、气弹簧4连接。竖向活塞7和四个水平活塞6一同把密闭支座外壳3划分成六个密闭空间，中间密闭空间填充阻尼液。所述的六个密闭空间分别为：竖向活塞7的圆柱形活塞上表面与垂直结构顶部之间的一个密闭空间，四个水平活塞6与水平结构内侧之间的四个密闭空间，竖向活塞7底面与四个水平活塞内侧之间的一个密闭空间。
如图5所示，所述的水平活塞6为空心圆柱体，共四个，分别安装在密闭支座外壳3中的四个水平滑道内；上下底面也就是水平安装的空心圆柱体的左右端面及侧面安装有第一环形磁铁61和第二环形磁铁62，第二环形磁铁62的磁极采用径向充磁，即磁极N、S分为两个半圆环柱体；内部设置有滚珠丝杠63，滚珠丝杠63的丝杠杆两端分别垂直固定于水平活塞6的左右端面，滚珠丝杠63的套筒可在丝杠杆上移动，套筒上安装扇叶，套筒两端安装第三环形磁铁65，第一环形磁铁61与第二环形磁铁65的S极相对，使其靠近时产生斥力。第三环形磁铁65周围采用铜块66包裹，铜块66起支架作用使滚珠丝杠63的套筒保持水平，并增加内部结构质量，且具有抗磁性，不受第二环形磁铁62的影响，利于水平运动，同时铜块66的运动会产生热量，消耗能量。
如图6所示，所述的滚珠丝杠5的套筒和竖向活塞7的连接，滚珠丝杠5的套筒固定于第一滚轴21的轴圈，竖向活塞7固定于滚轴的座圈，两者不发生接触，即滚珠丝杠5的套筒的转动与竖向活塞7的竖向位移互不影响。此图同样适用于第二滚轴64与滚珠丝杠63的套筒的连接，第二滚轴64的轴圈与滚珠丝杠63的套筒固接，座圈与第三环形磁铁65固接，滚珠丝杠63的套筒和第三环形磁铁65不发生接触，保证磁铁平移时不影响套筒发生转动。
当发生地震时，大型LNG储罐内储液发生晃动，带动充液球1中液体发生反方向晃动，此时充液球可看作为TLD。由于液体的柔性性质，大型LNG储罐储液液面会发生上下晃动，从而储液会冲击充液球1的底部使得钢绞线2上产生拉力，拉力传至竖向活塞7，通过竖向活塞7将力传递至气弹簧4，此时气弹簧4、竖向活塞7和钢绞线2一起发生竖向位移。滚珠丝杠5的丝杠杆垂直固定在密闭支座外壳3底面内侧，因此第一滚轴21固定在竖向活塞7底部的滚珠丝杠5的套筒在产生竖向位移时会发生转动，扇叶旋转，形成消耗阻尼。由于整个密闭支座外壳3是密闭的，由活塞划分的6个密闭空间在初始条件下压强处于平衡状态，当竖向活塞7发生位移时，竖向活塞7会首先打破这个平衡状态，整个系统会处于一个不平衡状态，从而引起水平活塞6在水平滑道中发生水平位移。固定在密闭支座外壳3、钢筋网22上的磁铁23和固定在水平活塞6左右端面内侧的第一环形磁铁61的N极相对，当水平活塞6在水平活塞内滑动时，磁铁23和第一环形磁铁61会靠近产生斥力，从而加剧水平活塞6在水平滑道中的运动。同时水平活塞6内部放置的第三环形磁铁65和铜块66，两者由于惯性会和水平活塞6发生相对位移，固定在水平活塞6左右端面内侧的第一环形磁铁61与铜块66上内嵌的第三环形磁铁65的S极相对，当两者之间的距离变小时会产生斥力，从而加剧水平活塞6的外壳和内部铜块66、第三环形磁铁65之间的相对运动。滚珠丝杠63的丝杠杆两端分别垂直固定在水平活塞6的左右端面上，滚珠丝杠63的套筒固定在第三环形磁铁65和铜块66的组合件上，即水平活塞6和内部铜块66、第三环形磁铁65之间的相对运动演变为滚珠丝杠63的丝杠杆和套筒之间的相对运动，从而套筒发生旋转，固定在套筒上的复合金属扇叶67开始转动。水平活塞6侧面安装第二环形磁铁62并且采用径向充磁，即磁极N、S分为两个半圆环柱体，复合金属扇叶67在磁场中旋转产生阻尼，耗散能量，同时铜块66本身在磁场运动也会产生阻尼，消耗能量。
在本实施例中，利用现有技术，竖向活塞7和密闭支座外壳3的垂直结构顶面处的连接处应保证密封性良好，既能保证直杆自由通过密闭支座外壳3又能保证密闭支座外壳3内部的密闭性。密闭支座外壳3所选用的材料应满足在-162℃的温度条件下满足强度要求的同时应具有抗磁性，例如铝合金等。
本发明的初始条件为控制气弹簧4使水平活塞6受到阻尼液的挤压靠近滑道外侧，在此条件下，当气弹簧4受到竖直向上的拉力时，气弹簧上半部分仍具有向上位移的能力。
以上所述实施例仅表达本发明的实施方式，但并不能因此而理解为对本发明专利的范围的限制，应当指出，对于本领域的技术人员来说，在不脱离本发明构思的前提下，做出若干变形和改进，这些也应该属于本发明的保护范围。

Claims (8)

  1. 一种充液球回弹式复合电磁耗能大型LNG储罐减晃装置，其特征在于，所述的减晃装置安装在大型LNG储罐的罐体内部，能够降低液面晃动波高，减小液体晃动幅度；LNG储罐减晃装置包括：充液球(1)和布置于充液球(1)下方的钢绞线(2)、密闭支座外壳(3)、气弹簧(4)、滚珠丝杠(5)、水平活塞(6)、竖向活塞(7)；
    所述的充液球(1)是密闭空心球，其内部填充阻尼液，能够浮在LNG储罐内液面上；所述的钢绞线(2)用于连接充液球(1)和竖向活塞(7)，即钢绞线(2)的上端固定于充液球(1)下方，下端固定于竖向活塞(7)顶部；
    所述的密闭支座外壳(3)包括水平结构和垂直结构两部分，为一体结构，固定在LNG储罐底面，水平结构由两个中空的细长圆柱体结构沿“十字形”布置而成，定义为水平滑道，其中心交点处布置垂直结构，垂直结构也为中空的细长圆柱体结构，定义为竖向滑道；通过在密闭支座外壳(3)内部水平结构和垂直结构交界面处焊接钢筋网(22)，将密闭支座外壳(3)划分为四个方向两两垂直水平滑道和一个垂直于水平滑道所在平面的竖向滑道；
    所述的竖向活塞(7)放置在密闭支座外壳(3)的竖向滑道中，上端伸出竖向滑道外与连接钢绞线(2)连接，下端与滚珠丝杠(5)、气弹簧(4)连接，气弹簧(4)用于防止竖向活塞(7)脱离竖向滑道，保证装置正常运行，同时为充液球(1)提供弹性恢复力，滚珠丝杠(5)的套筒上安装扇叶；所述的水平活塞(6)共四个，分别安装在密闭支座外壳(3)中的四个水平滑道内；竖向活塞(7)和四个水平活塞(6)一同将密闭支座外壳(3)划分成六个密闭空间，中间密闭空间填充阻尼液，活塞与滑道壁面贴合但不固定，能够移动。
  2. 根据权利要求1所述的一种充液球回弹式复合电磁耗能大型LNG储罐减晃装置，其特征在于，所述的水平滑道内的水平活塞(6)，结构为：
    所述的水平活塞(6)为空心圆柱体，空心圆柱体水平布置，其左右两端面均安装第一环形磁铁(61)，侧面安装第二环形磁铁(62)，第二环形磁铁(62)采用径向充磁，所述径向充磁指磁极N、S分为两个半圆环柱体；所述水平活塞(6)内部设有水平布置的滚珠丝杠(63)，滚珠丝杠(63)的丝杠杆两端分别垂直固定于水平活塞(6)的左右两端面，滚珠丝杠(63)的套筒能够在丝杠杆上移动，套筒上安装复合金属扇叶(67)，套筒两端均安装第三环形磁铁(65)，且第一环形磁铁(61)与第三环形磁铁(65)的S极相对，使其靠近时产生斥力；所述第三环形磁铁(65)周围采用铜块(66)包裹；所述滚珠丝杠(63)的套筒与第三环形磁铁(65)之间采用第二滚轴(64)连接，滚珠丝杠(63)的套筒固定于第二滚轴(64)的轴圈，第三环形磁铁(65)固定于第二滚轴(64)的座圈，两者不发生接触，使第三环形磁铁(65)水平移动时不会影响滚珠丝杠(63)的套筒的转动；所述的密闭支座外壳(3)的水平滑道两端设置磁铁(23)，外端固定在密闭支座外壳(3)内壁上，内端固定在钢筋网(22)上。
  3. 根据权利要求2所述的一种充液球回弹式复合电磁耗能大型LNG储罐减晃装置，其特征在于，所述的磁铁(23)和水平活塞(6)左右端面安装的第一环形磁铁(61)的N极相对；所述的水平活塞(6)左右端面内侧固定的第一环形磁铁(61)与铜块(66)上内嵌的第三环形磁铁(65)的S极相对。
  4. 根据权利要求1所述的一种充液球回弹式复合电磁耗能大型LNG储罐减晃装置，其特征在于，在密闭支座外壳(3)中水平活塞(6)和竖向活塞(7)内侧安装活塞环，使水平活塞(6)和竖向活塞(7)在具有滑动能力的同时保证其与密闭支座外壳(3)之间的密封性。
  5. 根据权利要求1所述的一种充液球回弹式复合电磁耗能大型LNG储罐减晃装置，其特征在于，所述的竖向滑道的半径是水平滑道半径的两倍。
  6. 根据权利要求1所述的一种充液球回弹式复合电磁耗能大型LNG储罐减晃装置，其特征在于，所述的竖向滑道内的气弹簧(4)的上端固定于竖向活塞(7)的下底面，下端固定在密闭支座外壳(3)的底面内侧；所述的滚珠丝杠(5)的上端都固定于竖向活塞(7)的下底面，下端都固定在密闭支座外壳(3)的底面内侧；滚珠丝杠(5)与竖向活塞(7)之间采用第一滚轴(21)连接，滚珠丝杠(5)的套筒固定于第一滚轴(21)的轴圈，竖向活塞(7)固定于第一滚轴(21)的座圈，滚珠丝杠(5)与竖向活塞(7)之间不发生接触，使滚珠丝杠(5)的套筒的转动与竖向活塞(7)的竖向位移互不影响。
  7. 根据权利要求1所述的一种充液球回弹式复合电磁耗能大型LNG储罐减晃装置，其特征在于，大型LNG储罐减晃装置根据要求调整尺寸，在LNG储罐中放置若干个。
  8. 根据权利要求2所述的一种充液球回弹式复合电磁耗能大型LNG储罐减晃装置，其特征在于，当发生地震时，大型LNG储罐内储液发生晃动：
    储液液面上下晃动冲击充液球(1)的底部使钢绞线(2)产生拉力，拉力通过竖向活塞(7)将力传递至气弹簧(4)，此时气弹簧(4)、竖向活塞(7)和钢绞线(2)一起发生竖向位移，进而带动滚珠丝杠(5)的套筒产生竖向位移；由于滚珠丝杠(5)的丝杠杆底部垂直固定在密闭支座外壳(3)底面内侧，因此滚珠丝杠(5)的套筒在产生竖向位移时会发生转动，套筒上安装的扇叶旋转，形成消耗阻尼；
    同时，由于整个密闭支座外壳(3)是密闭的，密闭空间在初始条件下处于平衡状态，当竖向活塞(7)随气弹簧(4)发生位移时，竖向活塞(7)首先打破这个平衡状态，整个系统会处于一个不平衡状态，从而引起水平活塞(6)在水平滑道中发生水平位移；固定在密闭支座外壳(3)、钢筋网上(22)的磁铁(23)和固定在水平活塞(6)左右端面内侧的第一环形磁铁(61)的N极相对，当水平活塞(6)在水平活塞内滑动时，磁铁(23)和第一环形磁铁(61)会靠近产生斥力，进而加剧水平活塞(6)在水平滑道中的运动；同时水平活塞(6)内部放置的第三环形磁铁(65)和铜块(66)，两者由于惯性会与水平活塞(6)的外壳之间发生相对位移，固定在水平活塞(6)左右端面内侧的第一环形磁铁(61)与铜块(66)上内嵌的第三环形磁铁(65)的S极相对，当两者之间的距离变小时会产生斥力，进而加剧水平活塞(6)和内部铜块(66)、第三环形磁铁(65)之间的相对运动；
    由于滚珠丝杠(63)的丝杠杆垂直固定在水平活塞(6)的左右端面上，滚珠丝杠(63)的套筒固定第三环形磁铁(65)和铜块(66)上，滚珠丝杠(63)的丝杠杆带动其上的套筒发生旋转，固定在套筒上的复合金属扇叶(67)开始转动；水平活塞(6)的筒壁侧面安装第二环形磁铁(62)，第二环形磁铁(62)采用径向充磁，复合金属扇叶(67)在第二环形磁铁(62)产生的磁场中旋转产生阻尼，耗散能量，同时铜块(66)本身在磁场运动也会产生阻尼，消耗能量。
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