A device for reducing sloshing in a liquid tank

Abstract

The application discloses a device for slowing down liquid tank sloshing, which comprises a liquid tank, a linear guide rail sliding mechanism, a combined sloshing plate device and an automatic rebound sloshing plate device. The device for slowing down liquid tank sloshing adopts a double sloshing reduction method. Firstly, the automatic rebound sloshing plate device is used to weaken the amplitude of the free surface sloshing wave height and the kinetic energy of the liquid sloshing in the middle part of the liquid tank. Secondly, when the liquid reaches the tank wall, the pores of the combined sloshing plate device are used to dissipate the energy of the liquid sloshing, hinder the direct action of the liquid free surface movement on the liquid tank side wall, reduce the impact load of the liquid sloshing on the liquid tank wall, suppress the phenomenon of climbing along the tank wall and top and jet, and adjust the position of the combined sloshing plate device by the linear guide rail sliding mechanism, so that the energy of the liquid sloshing is maximally dissipated, the natural frequency of the liquid tank is changed, resonance is effectively avoided, and the wave reduction and roll damping effect of the sloshing device is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship liquid transportation, and particularly relates to a device for reducing liquid tank sloshing. BACKGROUND

[0002] Liquid tank sloshing problems exist widely in the liquid transportation industry such as aerospace, ships and vehicles. The movement of the ship on the waves excites the liquid in the liquid tank to slosh, and the sloshing has strong nonlinearity and randomness, which produces a large impact pressure on the tank wall, especially when the liquid is partially loaded, which will cause local damage to the liquid tank structure. When the external excitation frequency is close to the natural frequency of the free surface of the liquid in the tank, the liquid sloshing is most severe, that is, resonance sloshing occurs. The liquid sloshing will produce a large hydrodynamic pressure on the tank wall, which endangers the safety of the liquid tank, and the large sloshing will also produce a capsizing moment, which affects the stability of the ship.

[0003] Liquid tank sloshing is one of the important safety problems that need to be considered when loading liquid in a large liquid storage tank, and is also an important content of the structural safety evaluation of the liquid tank. The currently used sloshing devices are mostly single perforated vertical plates or perforated horizontal plates. Especially for the perforated vertical plate, it directly receives the front impact pressure of the liquid sloshing, and the risk of fracture failure is high. When the ship is partially loaded and in complex sea conditions, the dangerous sloshing pressure produced by the liquid sloshing on the tank wall cannot be ideally inhibited by the existing devices. For the elastic sloshing plate, it relies on its elastic deformation to absorb and weaken the kinetic energy of the liquid sloshing, which is indeed better than the previous sloshing plate. However, long-term periodic elastic deformation needs to consider the possibility of fatigue fracture. SUMMARY

[0004] The present application provides a device for reducing liquid tank sloshing, which solves the problem of how to effectively suppress liquid sloshing.

[0005] Technical solution: The device for slowing down the sloshing of the liquid cabin comprises a liquid cabin, a linear guide rail sliding mechanism on the inner wall of the liquid cabin, a combined sloshing plate device installed on the linear guide rail sliding mechanism, and an automatic rebound sloshing plate device fixed in the liquid cabin; the linear guide rail sliding mechanism comprises a guide rail and a sliding block; the automatic rebound sloshing plate device is arranged at a predetermined position in the liquid cabin in the vertical longitudinal direction, and the two sides of the automatic rebound sloshing plate device are connected with the cabin wall; the automatic rebound sloshing plate device comprises a sloshing plate, a tension spring, and a fixed frame, a plurality of the sloshing plates are arranged in a linear array on the fixed frame in the vertical and horizontal directions, a plurality of transverse semicircular arc grooves are arranged on the surface of the sloshing plate at equal intervals, and the two ends of the tension spring are connected with the sloshing plate and the fixed frame respectively; the combined sloshing plate device comprises a horizontal perforated medium plate and a semicircular arc perforated medium plate, the two ends of the semicircular arc perforated medium plate are connected with the horizontal perforated medium plate respectively, and the horizontal perforated medium plate is slidably connected with the guide rail through the sliding block.

[0006] Preferably, a groove is formed in the cabin wall of the liquid cabin in the vertical direction to fix the guide rail.

[0007] Preferably, the liquid cabin is further provided with a plurality of horizontal frames, and the plurality of horizontal frames correspond to the horizontal frame positions on the fixed frame one by one.

[0008] Preferably, the automatic rebound sloshing plate device is provided with a bolt, the two ends of the sloshing plate are connected with the bolt, and the circular shaft of the bolt is inserted into the fixed position in the reserved hole at the two ends of the sloshing plate.

[0009] Preferably, the automatic rebound sloshing plate device is further provided with a compression spring, the compression spring is installed in the reserved space position on the two sides of the bolt and is fixedly connected with the rotating push plate at the two ends of the sloshing plate and the bolt.

[0010] Preferably, the compression spring is curved in a circular arc shape.

[0011] Preferably, the opening shape of the horizontal perforated medium plate is a slat hole, and the opening shape of the semicircular arc perforated medium plate is a round hole.

[0012] Preferably, the porosity of the horizontal perforated medium plate is 15% to 25%, and the porosity of the semicircular arc perforated medium plate is 10% to 20%.

[0013] Preferably, the thickness of the horizontal perforated medium plate and the semicircular arc perforated medium plate of the combined sloshing plate device is 30 mm, the total width of the combined sloshing plate device accounts for 1 / 20 to 1 / 10 of the width of the liquid cabin, the total height accounts for 1 / 12 to 1 / 8 of the depth of the liquid cabin, and a certain gap is left between the two ends and the liquid cabin wall.

[0014] Preferably, the slider of the linear guide sliding mechanism is slidably connected to the guide rail and is provided with a limit hole, and a certain gap is left between the slider and the bulkhead.

[0015] Beneficial effects: (1) This invention can suppress liquid tank sloshing to a certain extent, with dual sloshing reduction from the tank to the tank wall. In the tank, the automatic rebound damping plate device uses the deformation of the spring to passively apply the restoring force of the spring to the opposite direction of the sloshing liquid flow. At the same time, it also utilizes the advantage of the traditional vertical damping plate to obstruct the liquid sloshing from the front, consuming most of the kinetic energy of the liquid sloshing and slowing down the movement of the free surface. In the tank wall, the combined damping plate device increases the resistance of the sloshing liquid, causes the liquid to generate bubble-carrying vortices, breaks the liquid and inhibits the liquid from climbing up the tank wall, thereby consuming the kinetic and potential energy of the sloshing wave, reducing the sloshing impact load and weakening the degree of top impact and jet phenomenon, thereby achieving the maximum effect of suppressing sloshing. (2) This invention can be used in the transportation of liquefied natural gas with different liquid levels. By adjusting the immersion depth of the combined damping plate in the liquid tank, on the one hand, the energy of liquid sloshing is dissipated to the maximum extent, and on the other hand, the resonance frequency of sloshing is changed, thereby fully exerting the damping effect of the combined damping plate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the automatic rebound damping plate device of the present invention;

[0018] Figure 3 This is a partial structural schematic diagram of the damping plate of the present invention;

[0019] Figure 4 This is a partial schematic diagram of the automatic rebound damping plate device of the present invention;

[0020] Figure 5 This is a schematic diagram of the combined damping plate device of the present invention;

[0021] Figure 6 This is a schematic diagram of the linear guide rail, slider, and assembly of the linear guide rail sliding mechanism of the present invention.

[0022] Figure 7 This is a schematic diagram of the combined structure of the combined damping plate device and the linear guide sliding mechanism of the present invention. Detailed Implementation

[0023] This invention provides a device for mitigating liquid tank sloshing, such as... Figure 1 As shown, it includes a liquid tank 1, an automatic rebound damping plate device 2, a combined damping plate device 3, and a linear guide sliding mechanism 4.

[0024] The liquid tank 1 is in a box structure and is arranged in a ship. The inner tank wall of the liquid tank 1 is provided with a groove for fixing the guide rail 41 in the vertical direction. The liquid tank 1 is provided with a horizontal frame 11 at the predetermined position of the automatic rebounding swing plate device 1 in the tank, which corresponds to the position of the horizontal frame 251 of the fixed frame 25, so as to strengthen the strength of the fixed frame.

[0025] The automatic rebounding swing plate device 2 is composed of a swing plate 21, a compression spring 22, a tension spring 23, a bolt 24 and a fixed frame 25, is arranged in a predetermined position in the tank in the vertical direction, and is connected with the tank wall on both sides. The swing plate 21 is arranged in a linear array in the vertical and horizontal directions and is provided with a plurality of transverse semicircular arc grooves at equal intervals on the surface. When the liquid is hindered by the swing plate 21, the liquid will climb along the surface of the swing plate 21, and the grooves on the surface of the swing plate 21 can hinder the liquid from climbing to a certain extent. The swing plate 21 is connected with the bolt 24 at both ends, the round shaft of the bolt 24 is inserted into the fixed position in the reserved hole at both ends of the swing plate 21, so that the swing plate 21 can rotate freely and does not move left and right.

[0026] The compression spring 22 is curved in a circular arc shape, is arranged in the reserved space position on both sides of the bolt 24 and is fixedly connected with the rotating push plate 211 at both ends of the swing plate 21. When the liquid in the liquid tank shakes, the swing plate 21 rotates clockwise or counterclockwise, and the rotating push plate 211 of the swing plate 21 compresses one side of the spring and stretches the other side of the spring.

[0027] In addition, a plurality of first hanging rings 212 are provided at the bottom of the swing plate 21 and are connected with the tension spring 23. The other side of the tension spring 23 is connected with the fixed frame 25 which is also provided with a second hanging ring 252 at the corresponding position. The elastic deformation of the springs 22 and 23 at two positions accumulates elastic potential energy to inhibit the rotation of the swing plate 21, which is equivalent to the existence of damping in the system to dissipate energy and achieve the effect of inhibiting the swing of the liquid tank.

[0028] The rigid swing plate directly bears the swing impact load by using its rigidity and strength, and then reduces the swing effect. For the severe swing under the most unfavorable working condition, a higher strength rigid swing plate is needed, and the cost is increased. The flexible swing plate is prone to fatigue fracture at the connection between the flexible plate and the liquid tank due to long-term and periodic deformation, and the risk needs to be considered. The device of the application can also achieve the expected or even better effect in inhibiting the swing of the liquid tank by using the higher tensile and compressive strength and good buffering effect of the spring.

[0029] The combined sloshing plate device 3 comprises two horizontal perforated medium plates 31 and a semicircular arc perforated medium plate 32. The horizontal perforated medium plates 31 and the semicircular arc perforated medium plate 32 are uniformly provided with a plurality of holes, wherein the horizontal perforated medium plates 31 are provided with strip-shaped holes, and the semicircular arc perforated medium plate 32 is provided with circular holes. The semicircular arc perforated medium plate 32 is connected with the two horizontal perforated medium plates 31, and the two horizontal perforated medium plates 31 are slidably connected with the liquid tank 1 through a linear guide sliding mechanism 4, and a gap is left between the two ends and the tank wall.

[0030] The linear guide sliding mechanism 4 comprises a guide rail 41 and a sliding block 42. The guide rail 41 is fixed in a groove of the tank wall in the liquid tank 1 in the vertical direction, and the sliding block 42 is fixed on the two horizontal perforated medium plates 31. The sliding block 42 is slidably connected with the guide rail 41 and is provided with a limiting hole 411, and a gap is left between the sliding block 42 and the tank wall. By means of the linear guide sliding mechanism 4, the height position of the combined sloshing plate device 3 can be adjusted to be in the best position, so as to realize the maximum energy dissipation of liquid sloshing, change the natural frequency of the liquid tank 1, effectively avoid resonance, and better play the sloshing reduction effect of the device.

[0031] The device adopts a double sloshing reduction method. Firstly, the automatic rebound plate device 2 in the middle of the liquid tank 1 is used to weaken the amplitude of the free surface sloshing wave height and the kinetic energy of the liquid sloshing. Secondly, when the liquid reaches the tank wall, the holes of the horizontal perforated medium plates 31 and the semicircular arc perforated medium plate 32 in the combined sloshing plate device 3 are used to dissipate the energy of the liquid sloshing, so as to reduce the impact load of the liquid sloshing on the tank wall and inhibit the climbing of the liquid along the tank wall to cause the phenomena of top collision and jet flow. The device can achieve the expected effect in inhibiting the liquid tank sloshing.

Claims

1. A device for reducing sloshing in a liquid tank, characterized in that, The utility model provides a kind of liquid tank (1), linear guide rail sliding mechanism (4) in the inner wall of the liquid tank (1), combined oscillating plate device (3) installed on the linear guide rail sliding mechanism (4) and automatic rebound oscillating plate device (2) fixed in the liquid tank (1);The linear guide rail sliding mechanism (4) includes guide rail (41) and sliding block (42); The automatic rebound oscillating plate device (2) is arranged at a predetermined position in the liquid tank (1) along the longitudinal vertical direction, and the two sides of the automatic rebound oscillating plate device (2) are connected with the bulkhead; the automatic rebound oscillating plate device (2) includes an oscillating plate (21), a tension spring (23) and a fixed frame (25), a plurality of the oscillating plates (21) are arranged in a linear array on the fixed frame (25) in the vertical and horizontal directions, a plurality of transverse semicircular arc grooves are equidistantly arranged on the surface of the oscillating plate (21), and the two ends of the tension spring (23) are connected with the oscillating plate (21) and the fixed frame (25) respectively; a plurality of first hanging rings (212) are pre-provided at the bottom of the oscillating plate (21) and connected with the tension spring (23), and the other side of the tension spring (23) is connected with the fixed frame (25) provided with a second hanging ring (252) at the corresponding position; the liquid tank (1) is also provided with a plurality of horizontal frames (11), and the horizontal frames (11) are one-to-one corresponding to the horizontal frames (251) on the fixed frame (25); The combined oscillating plate device (3) includes a horizontal perforated medium plate (31) and a semicircular arc perforated medium plate (32), the two ends of the semicircular arc perforated medium plate (32) are connected with the horizontal perforated medium plate (31) respectively, the horizontal perforated medium plate (31) is slidably connected with the guide rail (41) through the sliding block (42), and a plurality of holes are uniformly provided in the horizontal perforated medium plate (31) and the semicircular arc perforated medium plate (32); the holes in the horizontal perforated medium plate (31) are strip holes, and the holes in the semicircular arc perforated medium plate (32) are round holes; The automatic rebound oscillating plate device (2) is provided with a bolt (24), the two ends of the oscillating plate (21) are connected with the bolt (24), the round shaft of the bolt (24) is inserted into the fixed position in the reserved hole at the two ends of the oscillating plate (21), and the automatic rebound oscillating plate device (2) is also provided with a compression spring (22), the compression spring (22) is arc-shaped, the compression spring (22) is installed in the reserved space position on the two sides of the bolt (24) and is fixedly connected with the bolt (24) and the rotating push plate (211) at the two ends of the oscillating plate (21).

2. A device for mitigating sloshing of a liquid tank according to claim 1, characterized in that, The bulkhead in the liquid tank (1) is provided with a groove in the vertical direction for fixing the guide rail (41).

3. A device for mitigating sloshing of a liquid tank according to claim 1, characterized in that, The porosity of the horizontal perforated medium plate (31) is 15% to 25%, and the porosity of the semicircular arc perforated medium plate (32) is 10% to 20%.

4. The device for mitigating sloshing of a liquid tank of claim 1, wherein, The horizontal opening medium plate (31) and the semi-circular arc opening medium plate (32) of the combined oscillating plate device (3) have a plate thickness of 30 mm, the overall width of the combined oscillating plate device (3) is 1 / 20-1 / 10 of the width of the liquid tank (1), the overall height is 1 / 12-1 / 8 of the depth of the liquid tank (1), and a gap is left between the two ends and the liquid tank wall.

5. The device for mitigating sloshing of a liquid tank of claim 1, wherein, The slider (42) of the linear guide rail sliding mechanism (4) is slidably connected with the guide rail (41) and is provided with a limiting hole (411), and a gap is left between the slider (42) and the tank wall.

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