A pendulum type liquid tank

Abstract

This invention provides a sloshing-controlled liquid tank, comprising a liquid tank body. The interior of the liquid tank body is divided into several compartments by multiple vertically intersecting sloshing-controlled chamber walls. The peripheries of the multiple sloshing-controlled chamber walls are perpendicularly fixed to the inner wall of the liquid tank body. Each longitudinal sloshing-controlled chamber wall has at least one sloshing-controlled hole. When multiple sloshing-controlled holes are provided, they are arranged vertically and alternately on the same longitudinal sloshing-controlled chamber wall. In each longitudinal compartment of the liquid tank body, there is a sloshing damper that moves horizontally within its compartment along a direction perpendicular to the longitudinal sloshing-controlled chamber wall. The sloshing damper is arranged on the same horizontal central axis as the unique sloshing-controlled hole or the uppermost sloshing-controlled hole. A damper is provided in the unique sloshing-controlled hole or the lowermost sloshing-controlled hole. The sloshing-controlled liquid tank of this invention dissipates the kinetic energy of the sloshing liquid in three stages: spatial partitioning, upper-level turbulence, and lower-level damping, thereby suppressing liquid tank sloshing and making it suitable for multi-section liquid tanks and complex working conditions.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and specifically to a sloshing-type liquid tank. Background Technology

[0002] During ocean voyages, ships are continuously subjected to wave excitation, resulting in rolling, pitching, and heaving motions. This causes severe sloshing of the liquids inside ballast tanks, cargo tanks, and other storage compartments. The dynamic impact loads generated by this sloshing directly act on the tank walls, hatch covers, and internal structures. Prolonged exposure can easily lead to structural fatigue damage and weld cracking, severely reducing the ship's structural strength and service life. Simultaneously, severe sloshing alters the ship's center of gravity distribution, worsening its stability and maneuverability, and threatening navigational safety. This problem is particularly pronounced for ships with long, narrow storage tanks, high liquid levels, and in complex sea conditions.

[0003] Currently, shipboard liquid tank sway control technology mainly relies on traditional fixed structures such as sway control bulkheads, sway control plates, and sway control girders. Fluid flow is limited by simple circular or rectangular openings in the bulkheads. This sway control principle is simplistic, relying solely on structural obstruction to reduce fluid velocity, and has significant drawbacks: First, sway control efficiency is low, with limited effectiveness in suppressing swaying in long liquid tanks and large-amplitude swaying; second, fluid impact remains concentrated at the edges of the bulkhead openings, failing to effectively reduce structural fatigue risk; third, its function is limited, failing to efficiently convert swaying potential energy into internal energy dissipation; and fourth, it lacks adaptability, with no universal or differentiated sway control solutions for liquid tanks with different cross-sections such as circular, rectangular, and elliptical, failing to meet the high-efficiency sway control requirements of modern ships with long liquid tanks and complex operating conditions. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a sloshing-controlled liquid tank. Through a triple coupling structure of sloshing-controlled tank wall partitioning, damper energy dissipation, and floating sloshing-controlled turbulence, it achieves efficient suppression of liquid tank sloshing, adapts to multi-section liquid tanks and complex operating conditions, and improves ship structural safety and navigation stability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A sway-controlling liquid tank includes a liquid tank body. The interior of the liquid tank body is divided into several compartments by multiple vertically intersecting sway-controlling chamber walls. The periphery of the multiple sway-controlling chamber walls is perpendicularly fixed to the inner wall of the liquid tank body. Each longitudinal sway-controlling chamber wall is provided with at least one sway-controlling hole. When multiple sway-controlling holes are provided, the multiple sway-controlling holes on the same longitudinal sway-controlling chamber wall are arranged vertically and alternately. Each longitudinal compartment of the liquid tank body is provided with a sway damper. The sway damper is either fixedly installed or moves horizontally within its compartment along a direction perpendicular to the longitudinal sway-controlling chamber wall. The sway damper is arranged on the same horizontal central axis as the unique sway-controlling hole or the uppermost sway-controlling hole. A damper is provided in the unique sway-controlling hole or the lowermost sway-controlling hole.

[0006] Furthermore, when the longitudinal section of the liquid tank body is circular, a sway control hole is provided on each of the longitudinal sway control chamber walls, and the sway control hole is concentrically arranged with the longitudinal sway control chamber wall.

[0007] Furthermore, when the longitudinal section of the liquid tank body is rectangular or elliptical, it is mirror-divided along the height direction of each longitudinal sway-controlling chamber wall, and sway-controlling holes are symmetrically arranged along the mirror axis. A transverse sway-controlling chamber wall is set at the height of each mirror axis, and each sway-controlling hole is concentrically arranged with the longitudinal sway-controlling chamber wall segment to which it is located.

[0008] Furthermore, the damper is a cavity-type container, with the upper part of its interior being a sealed air chamber filled with inert gas, and the remaining interior cavities being non-sealed cavities. The upper and lower parts of the non-sealed cavities are respectively provided with guide holes, and the height of the guide hole located at the upper part is lower than the lower edge of the sealed air chamber.

[0009] Furthermore, the oscillator is provided with a through hole extending along its central axis, and a steel rope is provided inside the liquid tank body, passing through multiple unique oscillator holes or multiple oscillator holes located at the uppermost part. The two ends of the steel rope are fixedly connected to the front and rear bulkheads of the liquid tank body, and the oscillator is threaded through the through hole onto the steel rope.

[0010] Furthermore, the damper includes a double-headed horn-shaped guide tube and a flexible damping cavity. The outer wall of the double-headed horn-shaped guide tube is fixedly connected to the inner edge of the damping hole. The flexible damping cavity is fixed to the inner wall of the double-headed horn-shaped guide tube and is filled with a non-Newtonian fluid.

[0011] Furthermore, multiple relief holes are evenly distributed around the periphery of each of the aforementioned damping holes.

[0012] Furthermore, a relief hole is provided on each of the transverse oscillation chamber walls; two earrings are provided mirror-symmetrically on the bottom of the oscillation device and the bottom wall of the opposite cavity, and the bottom earring of the oscillation device is connected to the bottom earring of the liquid tank by a rope, and the rope passes through the relief hole on the transverse oscillation chamber wall.

[0013] Furthermore, the damper includes a pear-shaped damper and a spindle-shaped damper, the narrow end of the pear-shaped damper facing the direction of the water flow, and the length direction of the spindle-shaped damper being parallel to the width direction of the liquid tank body.

[0014] Furthermore, the pear-shaped damper is located at both ends of a plurality of dampers arranged sequentially along the length of the liquid tank body, with a spindle-shaped damper in the middle, and the narrow ends of two pear-shaped dampers are arranged opposite each other; the spindle-shaped damper is fixedly installed; a semi-circular groove is provided in the middle of the width direction of the upper end face of the spindle-shaped damper.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Triple structural coupling and coordinated energy dissipation: zoned bulkhead flow restriction + floating oscillator turbulence + non-Newtonian damping energy dissipation, which is different from the single oscillator structure at home and abroad. It dissipates the kinetic energy of the swaying liquid in three stages: spatial zoning, upper turbulence and lower damping. 2. Innovative and universal layout for different tank types: Customized opening schemes for the three mainstream liquid tank cross-sections of circular, rectangular and elliptical. Circular tanks have single holes arranged concentrically, while rectangular / elliptical tanks have double holes mirrored along the height and are separated by transverse sway control tank walls. One structural system is compatible with multiple cross-section tanks. The universal design reduces construction and modification costs and solves the pain point of poor adaptability of existing sway control structure tank types. 3. Adaptive Damping: The lower damping hole is embedded with a double-headed horn guide tube and a flexible cavity non-Newtonian fluid damper. Relying on the shear thickening characteristics of non-Newtonian fluid, the higher the fluid velocity, the greater the deformation of the damper. It can adapt to the variable load sway from calm sea conditions to severe storm sea conditions, breaking through the performance bottleneck of traditional fixed parameter damping. 4. Reliable structure and easy maintenance: The double limit restraint device with steel rope and bottom rope ensures collision-free operation and eliminates the need for daily maintenance; various light-reducing holes achieve lightweight hull design and are compatible with existing shipbuilding processes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the liquid tank body as described in this invention when the longitudinal section is circular.

[0017] Figure 2 for Figure 1 Front view of the longitudinal sway control bulkhead.

[0018] Figure 3 This is a schematic diagram of the structure of the liquid tank body when the longitudinal section is rectangular, as described in this invention.

[0019] Figure 4 for Figure 3 Front view of the longitudinal sway control bulkhead.

[0020] Figure 5 for Figure 3 View from the AA direction.

[0021] Figure 6 This is a front view of the pear-shaped damper described in this invention.

[0022] Figure 7 This is a side view of the pear-shaped damper described in this invention.

[0023] Figure 8 This is a front view of the spindle-shaped damper described in this invention.

[0024] Figure 9This is a side view of the spindle-shaped damper described in this invention.

[0025] Among them, 1-liquid tank body, 2-longitudinal sway-damping bulkhead, 3-sway-damper, 4-damper, 5-steel cable, 6-rope, 7-earring, 8-lateral sway-damping bulkhead, 101-tank, 201-lightening hole, 202-sway-damping hole, 301-sealed air chamber, 302-non-sealed cavity, 303-guide hole, 304-through hole, 401-double-headed trumpet-shaped guide tube, 402-flexible damping cavity, 801-lateral lightening hole. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1-9 As shown, a sway-controlling liquid tank includes a liquid tank body 1. The interior of the liquid tank body 1 is divided into several compartments 101 by multiple longitudinal sway-controlling chamber walls 2 or crisscrossing sway-controlling chamber walls. The periphery of the multiple sway-controlling chamber walls is perpendicularly fixed to the inner wall of the liquid tank body 1. Each longitudinal sway-controlling chamber wall 2 is provided with at least one sway-controlling hole 202. When multiple sway-controlling holes 202 are provided, the multiple sway-controlling holes 202 located on the same longitudinal sway-controlling chamber wall 2 are arranged vertically and alternately. Each longitudinal compartment 101 of the liquid tank body 1 is provided with a sway damper 3. The sway damper 3 is either fixedly installed or moves horizontally within its compartment 101 along a direction perpendicular to the longitudinal sway-controlling chamber wall 2. The sway damper 3 is arranged on the same horizontal central axis as the unique sway-controlling hole 202 or the uppermost sway-controlling hole 202. A damper 4 is provided in the unique sway-controlling hole 202 or the lowermost sway-controlling hole 202.

[0028] When the longitudinal section of the liquid tank body 1 is circular, multiple longitudinal sway-controlling chamber walls 2 are vertically and evenly distributed in the circular liquid tank, dividing it into multiple compartments 101; each longitudinal sway-controlling chamber wall 2 is provided with a circular sway-controlling hole 202, and the sway-controlling hole 202 is concentrically arranged with the longitudinal sway-controlling chamber wall 2; lightening holes 201 are evenly distributed around the sway-controlling hole 202.

[0029] When the longitudinal section of the liquid tank body 1 is rectangular or elliptical, it is mirror-divided along the height direction of each longitudinal sway control chamber 2, and sway control holes 202 are symmetrically arranged along the mirror axis. A transverse sway control chamber 8 is set at the height of each mirror axis, and each sway control hole 202 is concentrically arranged with the longitudinal sway control chamber 2 segment to which it is located.

[0030] Furthermore, the damper 3 includes a pear-shaped damper and a spindle-shaped damper. The narrow end of the pear-shaped damper 3 faces the direction of the water flow, and the length direction of the spindle-shaped damper is parallel to the width direction of the liquid tank body 1.

[0031] The pear-shaped damper is located at both ends of a plurality of dampers arranged sequentially along the length of the liquid tank body 1, with a spindle-shaped damper in the middle. The narrow ends of two pear-shaped dampers are arranged opposite each other. The spindle-shaped damper is fixedly installed. A semi-circular groove is provided in the middle of the width direction of the upper end face of the spindle-shaped damper.

[0032] It is understandable that the liquid within the tank body 1 sloshes in two directions: forward and backward (along the length direction) and left and right (along the width direction). The forward and backward sloshing is the most dangerous due to its longer energy accumulation path. Two types of vortex dampers are used: pear-shaped dampers placed at both ends and spindle-shaped dampers placed in the middle. The pear-shaped dampers primarily eliminate forward and backward sloshing and secondarily eliminate left and right sloshing; while the spindle-shaped dampers primarily eliminate left and right sloshing and secondarily eliminate forward and backward sloshing. The entire process of vortex generation, stretching, and collapse around the dampers consumes a large amount of fluid kinetic energy, which is converted into fluid internal energy (viscous heat dissipation).

[0033] The pear-shaped oscillator slides horizontally along the steel cable as the liquid sways back and forth. On the one hand, it changes the effective flow area of ​​the oscillation orifice in real time. When the swaying velocity is high, the oscillator moves closer to the oscillation orifice, blocking the orifice opening and reducing its flow cross-section, thus forcibly throttling and decelerating the flow. When the velocity decreases, the pear-shaped oscillator moves away from the orifice, and the flow area of ​​the oscillation orifice recovers, passively adjusting the flow rate by relying on hydrodynamics. On the other hand, the reciprocating motion disturbs the near-field flow field, breaking up the large-scale continuous sheet-like swaying mainstream, decomposing the large-scale single-phase swaying flow into a large number of small-scale turbulences. After the large eddies are broken into small eddies, the kinetic energy is dissipated by the viscosity of the fluid molecules, which is consistent with the theory of energy dissipation in turbulence.

[0034] The spindle-shaped damper with a semi-circular groove can further dissipate energy. This can be understood as the groove diverting the flow to achieve layered and staggered flow, thereby achieving flow layer collision and mixing, and finally achieving vortex energy dissipation. The wall-bound flow guided along the groove collides with the lateral flow that crosses the groove ridge, generating fine vortex clusters on the spot. Kinetic energy is dissipated through mixing and friction.

[0035] In some embodiments, the damper 3 is a cavity-type container, the upper part of which is a sealed air chamber 301 filled with inert gas, and the remaining cavities are non-sealed cavities 302. The upper and lower parts of the non-sealed cavities 302 are respectively provided with guide holes 303, and the height of the guide hole 303 located at the upper part is lower than the lower edge of the sealed air chamber 301.

[0036] The upper sealed air chamber 301 forms a constant buoyancy, which keeps the oscillator suspended in the designed liquid level range, achieving stability at all immersion depths under all working conditions; the lower non-sealed cavity 302 is connected to the liquid inside the chamber through the upper and lower guide holes 303, and the liquid can freely enter and exit the non-sealed cavity 302, changing the added mass of the oscillator. The added mass effect changes the inherent oscillation frequency, avoiding the inherent frequency of the liquid sloshing inside the chamber, and preventing violent sloshing of the same frequency resonance type.

[0037] The closed air chamber of the pear-shaped vortex damper ensures that it has a certain buoyancy. The tip faces the incoming flow, and the fluid is bidirectionally split along the arc-shaped outer wall. Large-scale vortices continuously and periodically fall off the back flow surface, breaking down the originally continuous swaying mainstream of the whole cabin into a large number of small-scale turbulences. The collapse process of the vortex consumes the fluid kinetic energy.

[0038] The sealed air chamber of the spindle-shaped swell damper ensures it has a certain buoyancy. Its vertically elongated arrangement longitudinally severs the swell rising along the tank wall, suppressing liquid surface impact and vertical rise, thus weakening the impact load on the liquid surface. The swell damper 3 has a through-hole 304 extending along its central axis. Inside the liquid tank body 1, there is a steel rope 5 that passes through multiple unique swell damping holes 202 or multiple uppermost swell damping holes 202. The two ends of the steel rope 5 are fixedly connected to the front and rear tank walls of the liquid tank body 1. The swell damper 3 is threaded through the through-hole 304 onto the steel rope 5.

[0039] The damper 4 includes a double-headed horn-shaped guide tube 401 and a flexible damping cavity 402. The outer wall of the double-headed horn-shaped guide tube 401 is fixedly connected to the inner edge of the damping hole 202. The flexible damping cavity 402 is fixed on the inner wall of the double-headed horn-shaped guide tube 401 and is filled with a non-Newtonian fluid.

[0040] The sloshing fluid enters the double-headed horn-shaped guide tube 401. The non-Newtonian fluid inside the flexible damping cavity 402 generates adaptive damping, and the upper damper 3 turbulents with the flow, working together to suppress liquid sloshing.

[0041] Furthermore, multiple relief holes 201 are evenly distributed around each of the oscillation-controlling holes 202; and various lateral relief holes 801 of different shapes are provided on each of the transverse oscillation-controlling chamber walls 8. Two earrings 7 are mirror-symmetrically provided on the bottom of the oscillation-controller 3 and on the bottom wall of the opposite cavity. The earrings 7 at the bottom of the oscillation-controller 3 are connected to the earrings at the bottom of the liquid tank by a rope 6, and the rope 6 passes through the relief holes on the transverse oscillation-controlling chamber wall 8.

[0042] Those skilled in the art should understand that the above description is merely a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A type of oscillating liquid tank, characterized in that, The system includes a liquid tank body, the interior of which is divided into several compartments by multiple vertically intersecting sway control walls. The periphery of the multiple sway control walls is perpendicularly fixed to the inner wall of the liquid tank body. Each longitudinal sway control wall has at least one sway control hole. When multiple sway control holes are provided, they are arranged vertically and alternately on the same longitudinal sway control wall. Each longitudinal compartment of the liquid tank body is provided with a sway damper. The sway damper is either fixedly installed or moves horizontally within its compartment along a direction perpendicular to the longitudinal sway control wall. The sway damper is arranged on the same horizontal central axis as the unique sway control hole or the uppermost sway control hole. A damper is provided in the unique sway control hole or the lowermost sway control hole.

2. The oscillation-controlled liquid tank according to claim 1, characterized in that, When the longitudinal section of the liquid tank body is circular, a sway control hole is provided on each of the longitudinal sway control chamber walls, and the sway control hole is concentrically arranged with the longitudinal sway control chamber wall.

3. The oscillation-controlled liquid tank according to claim 1, characterized in that, When the longitudinal section of the liquid tank body is rectangular or elliptical, it is mirror-divided along the height direction of each longitudinal sway-damping chamber wall, and sway-damping holes are symmetrically arranged along the mirror axis. A transverse sway-damping chamber wall is set at the height of each mirror axis, and each sway-damping hole is concentrically arranged with the longitudinal sway-damping chamber wall segment in which it is located.

4. The oscillation-controlled liquid tank according to claim 1, characterized in that, The damper is a cavity-type container, with the upper part of its interior being a sealed air chamber filled with inert gas, and the remaining interior cavities being non-sealed cavities. The upper and lower parts of the non-sealed cavities are respectively provided with guide holes, and the height of the guide hole located at the upper part is lower than the lower edge of the sealed air chamber.

5. The oscillation-controlled liquid tank according to claim 4, characterized in that, The oscillator is provided with a through hole extending along its central axis. Inside the liquid tank body, there is a steel rope that passes through multiple unique oscillator holes or multiple oscillator holes located at the top. The two ends of the steel rope are fixedly connected to the front and rear bulkheads of the liquid tank body. The oscillator is threaded through the through hole onto the steel rope.

6. The oscillation-controlled liquid tank according to claim 1, characterized in that, The damper includes a double-headed horn-shaped guide tube and a flexible damping cavity. The outer wall of the double-headed horn-shaped guide tube is fixedly connected to the inner edge of the damping hole. The flexible damping cavity is fixed to the inner wall of the double-headed horn-shaped guide tube and is filled with a non-Newtonian fluid.

7. The oscillation-controlled liquid tank according to claim 2 or 3, characterized in that, Multiple relief holes are evenly distributed around the periphery of each of the aforementioned damping holes.

8. The oscillation-controlled liquid tank according to claim 3, characterized in that, A relief hole is provided on each of the transverse oscillation chamber walls; two earrings are provided mirror-symmetrically on the bottom of the oscillation device and the bottom wall of the opposite cavity. The bottom earring of the oscillation device is connected to the bottom earring of the liquid tank by a rope, and the rope passes through the relief hole on the transverse oscillation chamber wall.

9. The oscillation-controlled liquid tank according to claim 1, characterized in that, The damper includes a pear-shaped damper and a spindle-shaped damper. The narrow end of the pear-shaped damper faces the direction of the water flow, and the length of the spindle-shaped damper is parallel to the width of the tank body.

10. The oscillation-controlled liquid tank according to claim 9, characterized in that, The pear-shaped damper is located at both ends of a plurality of dampers arranged sequentially along the length of the liquid tank body, with a spindle-shaped damper in the middle. The narrow ends of two pear-shaped dampers are arranged opposite each other. The spindle-shaped damper is fixedly installed. A semi-circular groove is provided in the middle of the width direction of the upper end face of the spindle-shaped damper.

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