Gear-driven rotational amplification type Anti-sloshing apparatus

Abstract

The present invention provides a gear-driven rotational amplification type anti-sloshing apparatus. The gear-driven rotational amplification type anti-sloshing apparatus is disposed within a tank body of an LNG storage tank and positioned at an upper portion thereof, and comprises: a composite disc, a wheel set, an outer sleeve, an outward-extending fan blade, a ball screw, a spring, and a slosh baffle plate; the composite disc is connected to the slosh baffle plate below the composite disc by means of the spring, the composite disc being fixed to an upper portion of an inner wall surface of the tank body of the LNG storage tank, the slosh baffle plate abutting the inner wall surface of the tank body of the LNG storage tank without being fixedly connected thereto, and the wheel set, the outer sleeve, the outward-extending fan blades, and the ball screw being arranged between the composite disc and the slosh baffle plate, and all being located below a liquid level in the LNG storage tank. When an earthquake occurs, the anti-sloshing apparatus of the present invention utilizes the rotational amplification effect thereof to efficiently dissipate energy, thereby reducing the impact of the earthquake on the structure of large LNG storage tanks, and improving the safety of said LNG storage tank structure.

Description

A gear-driven rotation-amplifying sway reduction device Technical Field

[0001] The present invention belongs to the technical field of major lifeline engineering, and relates to a sway reduction device for an LNG storage tank, and in particular to a gear-driven rotation-amplifying sway reduction device. 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 purpose of the present invention is to provide a sloshing reduction device in a large LNG storage tank that can effectively reduce the height of liquid surface sloshing waves, reduce the amplitude of liquid sloshing, and thus reduce 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 gear-driven rotary amplifying sway reduction device is provided inside and above the tank body of an LNG storage tank. The large-scale LNG storage tank sway reduction device comprises: a combined disc 1, a wheel set 2, an outer sleeve 3, an outward-extending fan blade 4, a ball screw 5, a spring 6, and a swaying plate 7. The combined disc 1 located above is connected to the swaying plate 7 below it by a spring 6. The combined disc 1 is fixed above the inner wall surface of the LNG storage tank. The swaying plate 7 is fitted with the inner wall surface of the LNG storage tank but is not fixedly connected. The wheel set 2, the outer sleeve 3, the outward-extending fan blade 4, and the ball screw 5 are arranged between the combined disc 1 and the swaying plate 7. Except for the combined disc 1 and the spring 6, all others are located below the liquid level in the LNG storage tank.

[0007] The composite disk 1 comprises three enclosed hollow disks of different radii: large, medium, and small; a large annular magnet 13; a small annular magnet 15; a disk spring 16; and a rubber ring 11. The three enclosed hollow disks are, respectively, a large enclosed disk 12, a medium enclosed disk 14, and a small enclosed disk 17. Initially, the three disks are concentric, but become non-concentric during shaking. The rubber ring 11 is secured to the outer ring of the large enclosed disk 12. The large annular magnet 13 is mounted on the inner ring of the large enclosed disk 12. The small annular magnet 15 is mounted on the inner side of the medium enclosed disk 14. Several solid balls 18 are placed within the small enclosed disk 17. A small, sealed disc 17 is mounted within a medium, sealed disc 14, connected by a disc spring 16. The medium, sealed disc 14 is mounted within a large, sealed disc 12, forming a combined disc 1. Specifically, the outer diameter of the small, sealed disc 17 is smaller than the inner diameter of the medium, sealed disc 14. The combined disc 17 is positioned within the gap between the two, with the outer diameter of the medium and sealed disc 14 matching the inner diameter of the large, sealed disc 12. The inner diameter of the rubber ring 11 is equal to the outer diameter of the large, sealed disc 12, ensuring the two are tightly fitted and securely mounted together. The combined disc 1 is secured within the LNG tank body and positioned above the liquid level.

[0008] The wheel assembly 2 is located below the combined disc 1 and includes two identically structured wheels. The wheels are disc-shaped, with six blades 21 evenly mounted along their circumference, spaced 60 degrees apart. Spacers 22 are evenly spaced within the discs, along with a number of small balls 23. The two wheels face each other and are fixed to the ends of a central crossbar 106. A second gear 105 is provided on the central crossbar 106, which is connected to a vertical fixed rod 101. The vertical fixed rod 101 connects to the central crossbar 106 without affecting its rotation, allowing the two wheels to rotate under load. The top of the vertical fixed rod 101 is fixedly connected to the bottom surface of the combined disc 1, and the bottom is connected to the bracket 42 of the protruding blades 4. The middle portion is bent and sleeved onto the central crossbar 106.

[0009] The outer sleeve 3 is a sealed cylinder with an annular magnet 31 mounted on the inner side of the cylinder wall, a damping fluid filled inside and four ball screws 5 mounted thereon. A second rotating shaft 107 is fixedly mounted at the inner center of the top surface of the cylinder wall of the outer sleeve 3. An internal gear 35 is provided at the lower end of the second rotating shaft 107. A first rotating shaft 104 is fixedly mounted at the outer center of the top surface of the cylinder wall of the outer sleeve 3. A first gear 102 is provided at the upper end of the first rotating shaft 104, that is, the upper end of the first rotating shaft 104 is fixedly connected to the first gear 102, and the lower end is fixed to the outer center of the top surface of the cylinder wall of the outer sleeve 3. The upper end of the second rotating shaft 107 is fixed to the inner center of the top surface of the cylinder wall of the outer sleeve 3, and the lower end is fixed to the internal gear 35. An external gear 33 is provided on the outer side of the top of the cylinder wall of the outer sleeve 3, and the external gear 33 cooperates with the blade gear 45 of the outstretched blade 4. The bottom cover structure of the outer sleeve 3 is a composite sealed roller 32, which consists of a large sealed roller and four small sealed rollers. The composite sealed roller 32 has four circular holes on the bearing area of ​​the large sealed roller, and a small sealed roller is installed in each circular hole.

[0010] The composite metal fan blade 103 is installed on the sleeve of the ball screw 5, and the lower end of the sleeve of the ball screw 5 is fixed to the shaft ring of the closed small roller of the composite closed roller 32. The functions of the composite closed roller 32 are: first, it can ensure the airtightness of the outer sleeve 3; second, when the outer sleeve 3 rotates, it will not adversely affect the vertical movement of the wire lever of the ball screw 5 and the rotation of the sleeve; third, it can bear the vertical load and transmit the vertical load to the first rotating shaft 104 through the outer sleeve 3. The first rotating shaft 104 and the bracket 42 are connected by the intermediate roller 43. Then, the bracket 42 transmits the vertical load to the bottom surface of the combined disc 1, ensuring that the outer sleeve 3 and the sleeve of the ball screw 3 do not undergo vertical displacement. A top gear 34 is fixed above each ball screw 5. The four top gears 34 are connected to the internal gear 35 at the inner center of the top surface of the outer sleeve 3 through gear matching. The bottom of the ball screw 5 extends out of the sleeve through the shaft ring of the closed small roller on the composite closed roller 32 and is vertically fixed to the swing plate 7 below it.

[0011] The extended blades 4 include six groups of blade structures with the same structure, an intermediate roller 43, and six brackets 42 with the same structure. Each group of blade structures is composed of upper blades 41, bracket rollers 44, blade gears 45, and lower blades 46 from top to bottom, which are mounted on the bracket rotating shaft 47. The six bracket rollers 44 are connected to the intermediate roller 43 through the bracket 42. Specifically, the six upper blades 41 are evenly arranged along the outer ring of the top of the outer sleeve 3, with an interval of 60 degrees. The bracket 42 is fixed to the bottom of the combined disc 1 by a vertical fixing rod 101. The two ends of the six brackets 42 are respectively fixed to the seat rings of the intermediate roller 43 and the bracket roller 44. The bracket rotating shaft 47 is fixed to the shaft ring of the bracket roller 44, and the middle part of the first rotating shaft 104 is fixed to the shaft ring of the intermediate roller 43. In this way, the bracket 42 can fix the position of the bracket rotating shaft 47 and the first rotating shaft 104 without affecting the rotation of the upper blades 41 and the first rotating shaft 104. In addition, a first gear 102 is mounted on the top of the first rotating shaft 104. The first gear 102 is connected to the second gear 105 on the middle crossbar 106 via a gear coupling. The bottom of the first rotating shaft 104 is fixed to the center of the outer top surface of the outer sleeve 3. That is, the rotation of the outer sleeve 3 will drive the wheel assembly 2 to rotate. The size of the bracket 42 is determined by the outer sleeve 3 and should ensure that the blade gear 45 on the extended blade 4 and the outer gear 33 on the upper outer side of the outer sleeve 3 can achieve gear transmission, so that when the outer sleeve 3 rotates, it can simultaneously drive the upper blade 41 to rotate. In summary, the bracket 42 is fixed, thereby limiting the vertical displacement of the intermediate roller 43 and the bracket roller 44, and thus the first rotating shaft 104 and the bracket rotating shaft 47 fixed on the seat rings of the intermediate roller 43 and the bracket roller 44 will not undergo vertical displacement, that is, the outer sleeve 3 fixed to the first rotating shaft 104 will not undergo vertical displacement, and the sleeve of the composite closed roller 32 serving as the bottom cover structure of the outer sleeve 3 and the ball screw 5 fixed on the shaft ring of the small closed roller will not undergo vertical displacement; the rotation of the outer sleeve 3 will not be transmitted to the upper fan blade 41 through the bracket 42, but will be realized by connecting the external gear 33 on the upper outer side of the outer sleeve 3 and the fan gear 45 on the protruding fan blade 4 to realize the rotation of the upper fan blade 41 and the lower fan blade 46; and the rotation of the outer sleeve 3 can simultaneously drive the wheel group 2 to rotate.

[0012] Furthermore, the large and small annular magnets 13 and 15 of the composite disc 1 are axially magnetized to ensure that the magnetic poles are the same at the same height level, so that repulsion is generated when the two are close to each other.

[0013] Furthermore, a rubber ring 11 is provided on the outer ring of the combination disc 1. The rubber has high damping properties. Even if the combination disc 1 is fixedly installed, in order to prevent the sway reduction device from loosening the position of the combination disc 1 during normal operation, thereby impacting the tank wall and damaging the tank structure, the rubber ring 11 is added to achieve energy consumption and reduce the threat of the sway reduction device to the safety of the tank.

[0014] Furthermore, lubricating oil is appropriately applied between the disks in the combined disk 1 to reduce friction. When the enclosed large disk 12 moves, relative movement is ensured between the enclosed middle disk 14 and the enclosed large disk 12, and between the enclosed middle disk 14 and the enclosed small disk 17.

[0015] Furthermore, the bracket 42 restricts the middle roller 43 and the bracket roller 44 from vertical displacement, so the first rotating shaft 104 fixed to the shaft ring and the bracket rotating shaft 47 will not move vertically, thereby ensuring that the lower half of the anti-sway device can transfer the vertical load to the combined disc 1.

[0016] Furthermore, the radius ratio of the top gear 34 fixed above the ball screw 5 and the internal gear 35 of the outer sleeve 3 is set to 2, so as to achieve rotation amplification and facilitate energy consumption.

[0017] Furthermore, a composite metal blade 103 is installed on the sleeve of the ball screw 5. When the blade rotates, the presence of the magnetic field and the damping fluid makes energy consumption more efficient.

[0018] Furthermore, the sloshing plate 7 is made of a flexible material, which not only meets the deformation performance requirements of the sloshing reduction device but also has a certain rigidity to withstand the dynamic water pressure and realize force transmission.

[0019] The use process of the present invention is:

[0020] When an earthquake occurs, the composite disc 1 will shake along with the large LNG storage tank. The rubber ring 11 ensures the safety of the storage tank structure while also absorbing energy. The enclosed middle disc 14 will undergo relative displacement with the enclosed large disc 12 due to inertia. Since the large annular magnet 13 and the small annular magnet 15 are installed at the same height with the same magnetic poles, a repulsive force will be generated when the two are close together, further exacerbating the relative movement between the enclosed large disc 12 and the enclosed middle disc 14. Driven by the enclosed middle disc 14, the solid ball 18 inside the enclosed small disc 17 begins to move, collides, and consumes energy. The disc spring 16 will also deform due to the relative displacement between the enclosed middle disc 14 and the enclosed small disc 17, absorbing energy and consuming energy.

[0021] At the same time, during an earthquake, the liquid stored in a large LNG storage tank will also undergo horizontal movement. Due to the flexible nature of the liquid, the liquid surface will move up and down, causing the swaying plate 7 to produce an up and down bumping movement. Since the swaying plate 7 is fixedly connected to the lower end of the wire lever of the ball screw 5, it will drive the wire lever to move up and down. The up and down movement of the wire lever of the ball screw 5 will cause the sleeve of the ball screw 5 to rotate. Subsequently, the composite metal blades 103 on the sleeve will rotate in the magnetic field generated by the damping liquid and the annular magnet 31, generating a damping force and consuming energy. At the same time, the top gear 34 fixed above the ball screw 5 will also rotate, and further transmit the rotation to the internal gear 35 fixed at the inner center of the top surface of the barrel wall of the outer sleeve 3. The internal gear 35 transmits the rotation to the outer sleeve 3 through the second rotating shaft 107, thereby driving the outer sleeve 3 to rotate.

[0022] During the rotation of the outer sleeve 3, the outer sleeve 3 is connected to the blade gear 45 of the outward-extending blade 4 through the outer gear 33 fixed on the outer ring, and the rotation is transmitted to the upper blade 41 and the lower blade 46. The upper blade 41 and the lower blade 46 rotate, consuming energy. At the same time, the outer sleeve 3 also transmits the rotation to the first gear 102 fixed above through the first rotating shaft 104 fixed at the outer center of the top surface of the cylinder wall, thereby driving the rotation of the second gear 105 fixed on the middle cross bar 106; the rotation of the second gear 105 can drive the disc (i.e., the wheel set 2) fixed at both ends of the middle cross bar 106 to rotate. At this time, the blade 21 fixed on the outside of the disc and the small ball 23 placed inside both have energy consumption capabilities.

[0023] The sway reduction device of the present invention has a strong energy dissipation capacity, can reduce the influence of liquid surface sway caused by earthquake on the storage tank structure, and has high safety. Beneficial effects

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

[0025] 1) During an earthquake, the combined discs in the sway reduction device for a large LNG storage tank provided by the present invention will sway along with the large LNG storage tank. Relative sliding will occur between the enclosed large disc and middle disc, and between the middle disc and small disc. Due to the presence of internal annular magnets and springs, the relative motion between the enclosed middle disc and the enclosed large disc and small disc will be intensified, thereby improving the energy consumption efficiency of the internal small balls and springs.

[0026] 2) At the same time, the liquid stored in the tank will also shake. Due to the flexible nature of the liquid, the liquid surface will shake up and down, causing the swaying plate to bump up and down, driving the ball screw lever fixed to the swaying plate, causing the ball screw sleeve to rotate, and the composite metal fan blades on the sleeve to rotate. Due to the presence of damping fluid and magnetic field, the rotational energy consumption of the composite metal fan blades is more efficient. The ball screw sleeve is connected to the outer sleeve through gears of different radii, which has a rotation amplification effect and accelerates the rotation rate of the outer sleeve. Gears of different radii are also used between the outer sleeve and the extended fan blades and the wheel set to transmit the power, giving it a rotation amplification effect and improving energy consumption efficiency. When the wheel set rotates, in addition to the fan blades rotating and consuming energy in the stored liquid, the internal balls can also collide and consume energy while rotating.

[0027] 3) Furthermore, the number of intermediate sections in the sway reduction device is limited only by its own size. The size of the intermediate sections and the gear radius ratio can be adjusted to suit specific circumstances, ensuring proper operation under varying conditions. This improves the device's adaptability and ensures efficient energy consumption. The sway reduction device of this invention utilizes its rotational amplification effect to efficiently dissipate energy, reducing the impact of earthquakes on large LNG storage tank structures and improving their safety. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] FIG2 is a schematic structural diagram of the sway reduction device.

[0030] FIG3 (a) is a schematic diagram of the planar structure of the combined disc in the present invention.

[0031] FIG3( b ) is a schematic diagram of the elevation structure of the combined disc of the present invention.

[0032] FIG4 is a schematic structural diagram of the rubber ring in the present invention.

[0033] Figure 5 is a schematic diagram of the wheel disc structure of the wheel set.

[0034] FIG6 is a schematic structural diagram of the outer sleeve.

[0035] FIG7 is a schematic diagram showing the structural principle of the composite closed roller.

[0036] FIG8 is a cross-sectional view of the gear in the outer sleeve.

[0037] FIG9 is a schematic diagram of the structure of the extended fan blades.

[0038] FIG10 is a top view of the extended fan blades.

[0039] In the figure: 1 combined disc, 2 wheel assembly, 3 outer sleeve, 4 extended fan blade, 5 ball screw, 6 spring, 7 swing plate;

[0040] 11. Rubber ring; 12. Sealed large disc; 13. Large annular magnet; 14. Sealed medium disc; 15. Small annular magnet; 16. Disc spring; 17. Sealed small disc; 18. Solid ball; 101. Vertical fixing rod; 102. First gear; 103. Composite metal fan blade; 104. First rotating shaft; 105. Second gear; 106. Middle crossbar; 107. Second rotating shaft;

[0041] 21 fan blade; 22 partition; 23 ball;

[0042] 31 annular magnet; 32 composite sealing roller; 33 external gear; 34 top gear; 35 internal gear;

[0043] 41 upper fan blade; 42 bracket; 43 middle roller; 44 bracket roller, 45 fan blade gear; 46 lower fan blade; 47 bracket rotation axis. Modes for Carrying Out the Invention

[0044] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0045] This embodiment provides a large LNG storage tank sway reduction device, including a combined disc 1, a wheel set 2, an outer sleeve 3, an outward-extending fan blade 4, a ball screw 5, a spring 6, and a sway plate 7.

[0046] As shown in Figures 1, 2, 8, 9, and 10, the combined disc 1 is fixed to the inner wall of a large LNG storage tank and is located above the liquid level. The two discs of the wheel assembly 2 are opposite to each other and are fixedly connected by a central crossbar 106. The second gear 105 is fixed to the central crossbar 106. The vertical fixed rod 101 fixes the wheel assembly 2 below the combined disc 1 by connecting with the central crossbar 106. A first rotating shaft 104 is fixedly installed at the center of the outer side of the top surface of the cylinder wall of the outer sleeve 3. The first gear 102 fixed at the upper end of the first rotating shaft 104 is connected to the second gear 105 to transmit the rotation of the outer sleeve 3 to the wheel assembly 2.

[0047] The extended blades 4 comprise an upper blade 41, a bracket 42, an intermediate roller 43, a bracket roller 44, a blade gear 45, a lower blade 46, and a bracket rotation axis 47. The extended blades 4 have six blade groups. Each group consists, from top to bottom, of an upper blade 41, a bracket roller 44, a blade gear 45, and a lower blade 46. These groups are evenly spaced along the outer circumference of the outer sleeve 3, spaced 60 degrees apart. The brackets 42 of the extended blades 4 are secured to the underside of the assembly disc 1 via vertical fixing rods 101, effectively acting as a fixed bracket. The six groups of fan blade structures and the first rotating shaft 104 are connected by six brackets 42. The connection between the bracket 42 and each group of fan blades and the first rotating shaft 104 is connected by a bracket roller 44 and an intermediate roller 43, that is, the two ends of the bracket 42 are respectively fixed on the seat rings of the intermediate roller 43 and the bracket roller 44, the bracket rotating shaft 47 is fixed to the shaft ring of the bracket roller 44, and the middle part of the first rotating shaft 104 is fixed to the shaft ring of the intermediate roller 43. The bracket 42 not only fixes the position of the bracket rotating shaft 47 and the first rotating shaft 104, but also ensures that the upper fan blade 41 and the first rotating shaft 104 can rotate. In summary, the bracket 42 is fixed, thereby limiting the vertical displacement of the intermediate roller 43 and the bracket roller 44, and thus the first rotating shaft 104 and the bracket rotating shaft 47 fixed on the seat rings of the intermediate roller 43 and the bracket roller 44 will not occur vertical displacement, that is, the outer sleeve 3 fixedly connected to the first rotating shaft 104 will not occur vertical displacement, and the sleeve of the composite closed roller 32 as the bottom cover structure of the outer sleeve 3 and the ball screw 5 fixed on the shaft ring of the small closed roller will not occur vertical displacement; the size of the bracket 42 is determined by the outer sleeve 3, ensuring that the blade gear 45 on the protruding fan blade 4 and the external gear 33 on the upper outer side of the outer sleeve 3 realize gear transmission, thereby driving the upper fan blade 41 to rotate, that is, the rotation of the outer sleeve 3 will not be transmitted to the upper fan blade 41 through the bracket 42, but is connected and transmitted through the external gear 33 on the upper outer side of the outer sleeve 3 and the blade gear 45 on the protruding fan blade 4 to realize the rotation of the upper fan blade 41; and the rotation of the outer sleeve 3 can simultaneously drive the wheel group 2 to rotate.

[0048] The lower part of the wire lever of the ball screw 5 is vertically fixed to the swaying plate 7, and the wire lever can move up and down with the swaying plate 7. The spring 6 is used to connect the combined disc 1 and the swaying plate 7.

[0049] As shown in Figures 3(a) and 3(b), the composite disk 1 comprises three enclosed hollow disks of different radii (large, medium, and small), a large annular magnet 13, a small annular magnet 15, a disk spring 16, and a rubber ring 11. The three hollow disks are respectively the enclosed large disk 12, the enclosed medium disk 14, and the enclosed small disk 17. Initially, the three are concentric, but become non-concentric after being subjected to force during liquid sloshing. The rubber ring 11 is fixed to the outer side of the enclosed large disk 12. The large annular magnet 13 is mounted on the inner side of the enclosed large disk 12, and the small annular magnet 15 is mounted on the inner side of the enclosed medium disk 14. Several solid balls 18 are placed inside the enclosed small disk 17. The sealed small disc 17 is installed within the sealed middle disc 14, connected by a disc spring 16. The sealed middle disc 14 is then installed within the sealed large disc 12, and the rubber ring 11 is fixed to the outer ring of the sealed large disc 12, forming a combined disc 1. Specifically, the outer diameter of the sealed small disc 17 is smaller than the inner diameter of the sealed middle disc 14. The disc spring 16 is installed in the gap after the combination, and the outer diameter of the sealed middle disc 14 matches the inner diameter of the large disc. The large and small annular magnets 13 and 15 are axially magnetized to ensure that the magnetic poles are the same at the same height, so that a repulsive force is generated when the two are close together. The inner diameter of the rubber ring 11 is equal to the outer diameter of the sealed large disc 12, and the two are tightly fitted and fixed together. The combined disc 1 is currently considered to be fixed to the inside of the LNG storage tank, located above the liquid level. The height of the bracket can be adjusted according to the height of the stored liquid, thereby ensuring that the sway reduction device can function properly.

[0050] As shown in FIG4 , the rubber ring 11 is installed on the outer ring of the combined disc 1. Rubber has high damping properties. Even if the combined disc 1 is fixedly installed, in order to prevent the sway reduction device from loosening the position of the combined disc 1 during normal operation, thereby impacting the tank wall and damaging the tank structure, the rubber ring 11 is added. This achieves energy dissipation while also reducing the threat posed by the sway reduction device itself to the tank safety.

[0051] As shown in Figure 5, the wheel disc of the wheel assembly 2 is a disc structure, with six blades 21 evenly installed along its circumference, with a spacing of 60 degrees, and a partition 22 installed at equal intervals inside, and a number of small balls 23 placed inside. The wheel assembly 2 includes two discs, the disc surfaces of the two discs facing each other, and the two discs are connected by a middle crossbar 106. The two discs are then fixed below the combined disc 1 through the connection between the vertical fixing rod 101 and the middle crossbar 106, and the second gear 105 is fixed to the middle crossbar 106. The connection between the vertical fixing rod 101 and the middle crossbar 106 is connected by a roller. The vertical fixing rod 101 is fixed to the seat ring of the roller, and the middle crossbar 106 is fixed to the shaft ring of the roller, thereby ensuring that the vertical fixing rod 101 does not affect the rotation of the middle crossbar 106, that is, the two discs can rotate under force.

[0052] As shown in Figures 6 and 7, the outer sleeve 3 is a sealed cylinder, with an annular magnet 31 installed on the inner side of the cylinder wall, a damping fluid filled inside and four ball screws 5 installed, a second rotating shaft 107 is fixedly installed at the inner center of the top surface of the cylinder wall of the outer sleeve 3, and an internal gear 35 is provided at the lower end of the second rotating shaft 107. The first rotating shaft 104 is fixedly installed at the outer center of the top surface of the cylinder wall of the outer sleeve 3, and the upper end of the first rotating shaft 104 is provided with a first gear 102, that is, the upper end of the first rotating shaft 104 is fixedly connected to the first gear 102, and the lower end is fixed to the outer center of the top surface of the cylinder wall of the outer sleeve 3. The upper end of the second rotating shaft 107 is fixed to the inner center of the top surface of the cylinder wall of the outer sleeve 3, and the lower end is fixed to the internal gear 35. An external gear 33 is provided on the outer side of the top of the cylinder wall of the outer sleeve 3, and the external gear 33 cooperates with the blade gear 45 of the outstretched fan blade 4. The bottom cover structure of the outer sleeve 3 is a composite sealed roller 32, which consists of a large sealed roller and four small sealed rollers. The composite sealed roller 32 has four circular holes on the bearing area of ​​the large sealed roller, and a small sealed roller is installed in each circular hole.

[0053] The sleeve of the ball screw 5 is mounted with a composite metal fan blade 103. The sleeve of the ball screw 5 is fixed to the shaft ring of the sealed small roller of the composite sealed roller 32. The four ball screws 5 have their respective levers passing through the shaft rings of the four sealed small rollers. A top gear 34 is fixed to the top of each ball screw 5. Each of the four top gears 34 is connected to an internal gear 35 at the center of the inner wall of the top surface of the outer sleeve 3 through a gear coupling. The bottom of the lever of the ball screw 5 extends out of the sleeve through the shaft ring of the sealed small roller on the composite sealed roller 32 and is then vertically fixed to the sway plate 7 below it. The sway plate 7 is made of a flexible material that meets the deformation requirements of the sway reduction device while also possessing a certain rigidity to withstand dynamic water pressure and achieve force transmission.

[0054] The sway reduction device of the present invention, when an earthquake occurs:

[0055] The combined disc 1 will rock along with the large LNG storage tank. The rubber ring 11 ensures the safety of the storage tank structure while also having energy dissipation capabilities. The enclosed middle disc 14 will undergo relative displacement with the enclosed large disc 12 due to inertia. Since the large annular magnet 13 and the small annular magnet 15 are installed at the same height position with the same magnetic poles, a repulsive force will be generated when the two are close to each other, which will intensify the relative movement between the enclosed large disc 12 and the enclosed middle disc 14. Driven by the enclosed middle disc 14, the enclosed small disc 17 starts to move, collides, and consumes energy. The disc spring 16 will also deform due to the relative displacement between the enclosed middle disc 14 and the enclosed small disc 17, absorbing energy and consuming energy. The liquid stored in the large LNG storage tank will also undergo horizontal movement. Due to the flexible nature of the liquid, the liquid surface will move up and down, causing the swaying plate 7 to produce an up and down bumpy movement. Because the sway plate 7 is fixedly connected to the lower end of the ball screw 5's lever, it drives the lever up and down. This up and down movement of the ball screw 5's lever causes the sleeve of the ball screw 5 to rotate. Subsequently, the composite metal blades 103 on the sleeve rotate in the magnetic field generated by the damping fluid and the annular magnet 31, generating a damping force and consuming energy. At the same time, the top gear 34 fixed above the ball screw 5 also rotates, further transmitting the rotation to the internal gear 35 fixed to the center of the inner wall of the top surface of the outer sleeve 3. The internal gear 35 transmits the rotation to the outer sleeve 3 via the second rotating shaft 107, thereby driving the outer sleeve 3 to rotate. The outer sleeve 3 is connected to the blade gear 45 via an external gear 33 fixed on the outside and above, transmitting rotation to the upper blade 41. The upper blade 41 rotates, consuming energy. At the same time, the outer sleeve 3 also transmits rotation to the first gear 102 fixed above it via a first rotating shaft 104 fixed at the center of the outer top surface of the sleeve wall, thereby driving the rotation of the second gear 105 fixed to the middle crossbar 106. The two discs fixed at both ends of the middle crossbar 106, namely the wheel set 2, rotate. At this time, the blades outside the discs and the small balls placed inside the discs all have energy dissipation capabilities. The sway reduction device of the present invention has a strong energy dissipation capacity, can reduce the impact of liquid level sway caused by earthquakes on the tank structure, and has high safety.

[0056] In this embodiment, the reset mechanism is a spring 6, which includes a connecting portion on the bottom surface of the combined disc 1 and a connecting portion on the swaying plate 7 to provide a restoring force.

[0057] 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 gear-driven rotation-amplifying sway reduction device, characterized in that: The sway reduction device is arranged inside the tank body of the LNG storage tank and is located above, and includes: a combined disc (1), a wheel group (2), an outer sleeve (3), an outward-extending fan blade (4), a ball screw (5), a spring (6) and a swaying plate (7); the combined disc (1) and the swaying plate (7) below it are connected by a spring (6); the combined disc (1) is fixed above the inner wall surface of the tank body of the LNG storage tank, the swaying plate (7) is in contact with the inner wall surface of the tank body of the LNG storage tank but is not fixedly connected; the wheel group (2), the outer sleeve (3), the outward-extending fan blade (4), and the ball screw (5) are arranged between the combined disc (1) and the swaying plate (7); except for the combined disc (1) and the spring (6), the others are all located below the liquid level in the LNG storage tank.

2. The gear-driven rotation-amplifying sway reduction device according to claim 1, characterized in that: The composite disc (1) comprises three sealed hollow discs, namely a large, medium and small disc, a large annular magnet (13), a small annular magnet (15) and a rubber ring (11), wherein the three sealed hollow discs are respectively a sealed large disc (12), a sealed medium disc (14) and a sealed small disc (17), and the three are concentric in the initial state but not concentric during the shaking process; the rubber ring (11) is fixed on the outer ring of the sealed large disc (12), and the inner ring of the sealed large disc (12) is fixed on the outer ring of the sealed large disc (12). A large annular magnet (13) is installed in the ring, a small annular magnet (15) is installed on the inner side of the closed middle disc (14), and a plurality of solid small balls (18) are placed inside the closed small disc (17); the closed small disc (17) is installed in the closed middle disc (14), and the two are connected by a disc spring (16); the closed middle disc (14) is installed in the closed large disc (12), forming a combined disc (1); the combined disc (1) is fixed inside the tank body and is located above the liquid level; The wheel set (2) is located below the combined disc (1) and includes two wheels with the same structure. The wheel disc is a disc structure, and six fan blades (21) are evenly installed along the outer circumference of the disc. A partition (22) is evenly installed on the inner circumference of the wheel disc, and a plurality of small balls (23) are placed at the same time; the disc surfaces of the two wheel discs are opposite to each other and are respectively fixed on the two ends of the middle cross bar (106); the second gear (105) is also fixed on the middle cross bar (106); the middle cross bar (106) is connected to the vertical fixed rod (101), and the vertical fixed rod (101) is connected to the middle cross bar (106) without affecting the rotation of the middle cross bar (106), that is, the two wheel discs can rotate under force; the top of the vertical fixed rod (101) is fixedly connected to the bottom surface of the combined disc (1), and the bottom end is connected to the bracket (42) of the extended fan blade (4), and the middle part is bent and sleeved with the middle cross bar (106); The outer sleeve (3) is a sealed cylinder, with an annular magnet (31) installed on the inner side of the cylinder wall, and the interior is filled with damping fluid and installed with four ball screws (5); a second rotating shaft (107) is fixedly installed at the center of the inner side of the top surface of the cylinder wall of the outer sleeve (3), and an internal gear (35) is provided at the lower end of the second rotating shaft (107); a first rotating shaft (104) is fixedly installed at the center of the outer side of the top surface of the cylinder wall of the outer sleeve (3), and a first gear (102) is provided at the upper end of the first rotating shaft (104); an external gear (33) is provided on the outer side of the top of the cylinder wall of the outer sleeve (3), and the external gear (33) cooperates with the blade gear (45) of the extended fan blade (4); the bottom cover structure of the outer sleeve (3) is a composite sealed roller (32), which consists of a sealed large roller and four sealed small rollers, and the composite sealed roller (32) is a sealed large roller with four circular holes on the bearing area, and a sealed small roller is installed at each circular hole; The composite metal fan blade (103) is installed on the sleeve of the ball screw (5), and the lower end of the sleeve of the ball screw (5) is fixed on the shaft ring of the closed small roller of the composite closed roller (32). The functions of the composite closed roller (32) are: first, it can ensure the airtightness of the outer sleeve (3); second, when the outer sleeve (3) rotates, it will not reversely affect the vertical movement of the wire lever of the ball screw (5) and the rotation of the sleeve; third, it can bear the vertical load and transmit the vertical load to the first rotating shaft (104) through the outer sleeve (3). A rotating shaft (104) and a bracket (42) are connected via an intermediate roller (43), and the bracket (42) then transmits the vertical load to the bottom surface of the combined disc (1), ensuring that the outer sleeve (3) does not undergo vertical displacement; a top gear (34) is fixed above each ball screw (5), and the four top gears (34) are all connected to the internal gear (35) via gear matching, and the lower end of the wire lever of the ball screw (5) extends out of the sleeve through the shaft ring of the sealed small roller on the composite sealed roller (32) and is vertically fixed to the swaying plate (7); The outward extending blades (4) include six groups of blade structures with the same structure, an intermediate roller (43) and six brackets (42) with the same structure; wherein each group of blade structures comprises, from top to bottom, an upper blade (41), a bracket roller (44), a blade gear (45) and a lower blade (46), which are mounted on a bracket rotating shaft (47); and the six bracket rollers (44) are all connected to the intermediate roller (43) through the bracket (42).

3. The gear-driven rotation-amplifying sway reduction device according to claim 2, characterized in that: The outwardly extending fan blades (4) are specifically: The six upper blades (41) are evenly arranged along the outer ring of the top of the wall of the outer sleeve (3); the bracket (42) is fixed to the bottom of the combined disc (1) by being fixedly connected to the lower end of the vertical fixed rod (101); the two ends of the six brackets (42) are respectively fixed to the seat rings of the intermediate roller (43) and the bracket roller (44); the bracket rotating shaft (47) is fixed to the shaft ring of the bracket roller (44); the middle part of the first rotating shaft (104) is fixed to the shaft ring of the intermediate roller (43); the bracket (42) can realize the position fixation of the bracket rotating shaft (47) and the first rotating shaft (104) without affecting the rotation of the upper blades (41) and the first rotating shaft (104); in addition, A first gear (102) is installed on the top of the first rotating shaft (104), and the first gear (102) is connected to the second gear (105) on the middle cross bar (106) through gear matching. The bottom of the first rotating shaft (104) is fixed to the center of the outer side of the top surface of the cylinder wall of the outer sleeve (3), that is, the rotation of the outer sleeve (3) will drive the wheel group (2) to rotate; the size of the bracket (42) is determined by the outer sleeve (3), and it should be ensured that the blade gear (45) on the extended blade (4) and the outer gear (33) on the outer side of the top of the cylinder wall of the outer sleeve (3) realize gear transmission, so that when the outer sleeve (3) rotates, it can simultaneously drive the upper blade (41) to rotate.

4. The gear-driven rotation-amplifying sway reduction device according to claim 2, characterized in that: The large annular magnet (13) and the small annular magnet (15) of the composite disc (1) are axially magnetized to ensure that the magnetic poles are the same at the same height level, so that repulsion is generated when the two are close to each other.

5. A gear-driven rotation-amplifying sway reduction device according to any one of claims 1 to 4, characterized in that: When an earthquake occurs: The combined disc (1) shakes along with the storage tank, and the rubber ring (11) ensures the safety of the storage tank structure while having energy dissipation capability, and the closed middle disc (14) and the closed large disc (12) are relatively displaced; when the large annular magnet (13) and the small annular magnet (15) are close to each other, a repulsive force is generated, further intensifying the relative movement between the closed large disc (12) and the closed middle disc (14); the closed small disc (17) is driven by the closed middle disc (14), and the solid small ball (18) inside it collides, consuming energy, and the disc spring (16) is also deformed due to the relative displacement between the closed middle disc (14) and the closed small disc (17), consuming energy; At the same time, during the earthquake, the liquid level in the storage tank moves up and down, causing the sloshing plate (7) to jolt up and down, and then the sloshing plate (7) drives the wire lever of the ball screw (5) to move up and down, causing the sleeve of the ball screw (5) to rotate. Subsequently, the composite metal fan blade (103) on the sleeve rotates in the magnetic field generated by the damping liquid and the annular magnet (31), generating a damping force and consuming energy. At the same time, the top gear (34) fixed above the ball screw (5) also rotates, and further transmits the rotation to the internal gear (35) fixed at the inner center of the top surface of the cylinder wall of the outer sleeve (3). The internal gear (35) transmits the rotation to the outer sleeve (3) through the second rotating shaft (107), thereby driving the outer sleeve (3) to rotate and consume energy.

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