Rebound composite electromagnetic energy dissipation device for reducing sloshing with liquid-filled ball for large liquefied natural gas (LNG) storage tank

A rebound composite electromagnetic energy dissipation device for reducing sloshing with a liquid-filled ball for a large liquefied natural gas (LNG) storage tank, wherein the device for reducing sloshing is installed inside a tank body of a large LNG storage tank, which can reduce the sloshing wave height of a liquid surface and the liquid sloshing amplitude;

• and the device for reducing sloshing for an LNG storage tank comprises:
• a liquid-filled ball (1), and a steel strand (2), a sealed support shell (3), a gas spring (4), ball screws (5), horizontal pistons (6) and a vertical piston (7) which are arranged below the liquid-filled ball (1);
• the liquid-filled ball (1) is a sealed hollow ball filled with damping fluid and can float on the liquid surface of the LNG storage tank;
• and the steel strand (2) is used for connecting 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 at the top of the vertical piston (7);
• the sealed support shell (3) comprises a horizontal structure and a vertical structure and is an integrated structure fixed on the bottom surface of the LNG storage tank, the horizontal structure is composed of two hollow slender cylinder structures arranged along a cross shape and is defined as a horizontal slideway, the central intersection point of which is provided with a vertical structure, and the vertical structure is also a hollow slender cylinder structure and is defined as a vertical slideway;
• and by welding reinforcing meshes (22) at the interface of the horizontal structure and the vertical structure inside the sealed support shell (3), the sealed support shell (3) is divided into horizontal slideways pairwise perpendicular in four directions and one vertical slideway perpendicular to a plane where the horizontal slideways are located;
• the vertical piston (7) is placed in the vertical slideway of the sealed support shell (3), the upper end is extended out of the vertical slideway and connected with the steel strand (2), the lower end is connected with the ball screws (5) and the gas spring (4), the gas spring (4) is used for preventing the vertical piston (7) from leaving the vertical slideway to ensure normal operation of the device and provide an elastic restoring force for the liquid-filled ball (1), and a sleeve of each ball screw (5) is provided with a fan blade;
• the number of the horizontal pistons (6) is four, which are respectively installed in the four horizontal slideways in the sealed support shell (3);
• and the sealed support shell (3) is divided into six sealed spaces by the vertical piston (7) and the four horizontal pistons (6), the middle sealed space is filled with damping fluid, and the pistons are fitted but not fixed to the wall surfaces of the slideways and can move.