A rotatable cover for suppressing tank sloshing

Abstract

The present invention discloses a rotatable cover plate for suppressing sloshing of a liquid tank, comprising a cover plate for reducing the degree of sloshing of liquid in the liquid tank, an axial hole being provided in the middle of the cover plate perpendicular to the direction of liquid flow, a long axis passing through the axial hole, and both ends being fixed to a lifting rod by a knob mechanism, so that the cover plate can swing freely around the long axis as the liquid in the liquid tank sloshes, a locking mechanism being provided at both ends of the axial hole to prevent the cover plate from rotating around the long axis, and multiple groups of arc grooves of different lengths being provided on one side of both ends of the axial hole, and angle control mechanisms of different lengths being provided according to the distance between each group of arc grooves and the long axis to control the rotation angle of the cover plate around the long axis, one end of the angle control mechanism being fixed to the long axis and the other end being buckled in the arc groove. The present invention solves the problem in the prior art that, in order to suppress sloshing of liquid in the liquid tank, the liquid tank is divided into multiple subspaces, which reduces the effective volume of the liquid tank and is also not conducive to the free exchange of water in each subspace.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid sloshing suppression, and in particular to a rotatable cover plate for suppressing liquid tank sloshing. Background Art

[0002] Sloshing is a common fluid motion phenomenon that typically occurs in partially filled tanks. These include liquid propellant tanks in aircraft and rockets in flight, liquid cargo ships such as LNG, LPG, and crude oil tankers at sea, fuel tankers traveling on highways, and the movement of fluids in liquid storage systems such as nuclear reactors and reservoirs during earthquakes. Sloshing is a complex fluid motion. When the frequency of the external excitation approaches the natural frequency of the liquid in the tank, or when the amplitude of the excitation is very large, it can easily cause violent sloshing of the liquid within the tank, generating strong impact pressure on the bulkhead or roof, potentially causing structural damage.

[0003] In existing technology, baffles or floats are commonly used to suppress liquid sloshing in liquid tanks. These baffles or floats are placed vertically or horizontally within the tank to achieve a sloshing reduction effect. For optimal sloshing reduction, vertical baffles require their tops to be as close to the free liquid surface as possible, dividing the tank into multiple subspaces and reducing its effective volume. Horizontal baffles also divide the tank, hindering the upward and downward exchange of water. Summary of the Invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a rotatable cover for suppressing sloshing of the liquid tank, which can swing freely around the axis as the liquid in the liquid tank sloshes without separating the liquid.

[0005] Technical solution: To achieve the above-mentioned purpose, the rotatable cover for suppressing liquid tank sloshing described in the present invention includes a cover for reducing the degree of liquid sloshing in the liquid tank, an axial hole is provided in the middle of the cover perpendicular to the direction of liquid flow, the long axis passes through the axial hole, and both ends are fixed to the lifting rod through a knob mechanism. The cover swings freely around the long axis as the liquid in the liquid tank sloshes, and locking mechanisms are provided at both ends of the axial hole to prevent the cover from rotating around the long axis. Multiple groups of arc grooves of different lengths are also provided on one side of both ends of the axial hole. According to the distance between each group of arc grooves and the long axis, angle control mechanisms of different lengths are provided to control the rotation angle of the cover around the long axis. One end of the angle control mechanism is fixed on the long axis, and the other end is buckled in the arc groove.

[0006] Among them, a circle of through holes is provided around the cover plate plane to reduce the impact force of the liquid.

[0007] The weight of the cover plate should be such that when it is suspended in the liquid, the horizontal center line of the cover plate is at the free surface of the liquid.

[0008] One end of the knob mechanism is a cylinder with an internal thread, which is screwed onto the two ends of the long shaft through the internal thread of the cylinder.

[0009] Among them, the top end of the lifting rod is provided with a buckle that is sleeved on the cylinder, and the buckle is tightened on the outer ring of the cylinder with bolts and nuts.

[0010] The lifting rod is a multi-stage lifting structure, which adjusts the height of the cover according to the height of the liquid in the liquid tank.

[0011] The lower end of the lifting rod is provided with a through hole for fixing it in the liquid tank.

[0012] The locking mechanism is provided with internal and external threads, the internal threads are used to screw the locking mechanism from both ends of the long shaft toward the cover plate, and the external threads are used to match the locking mechanism with the internal threads at both ends of the shaft hole.

[0013] Among them, one end of the angle control mechanism is a sleeve with an internal thread, the internal thread of the sleeve is used to fix the angle control mechanism on the long axis, and the other end is an L-shaped control rod.

[0014] Among them, a right-angled side of the L-shaped control rod is buckled in the arc-shaped groove, and moves in the arc-shaped groove as the cover plate rotates around the long axis.

[0015] Beneficial effects: The present invention has the following significant advantages: 1. The density of the cover plate is lower than that of the liquid in the tank, and it can float on the liquid surface in a stable state. When the liquid in the tank sloshes, the cover plate will rotate around its long axis, thereby suppressing the sloshing of the free surface and thus the entire tank;

[0016] 2. According to the different liquid loading rates in the cabin, the arc groove and angle control mechanism are used to control the rotation angle of the cover around the long axis, so that the cover can move more flexibly with the free surface of the liquid, thereby reducing the damage of the liquid to the bulkhead;

[0017] 3. The height of the cover plate is controlled by the lifting rod to keep it near the free liquid surface, thereby limiting the movement of the free surface of the liquid and better suppressing the sloshing of the liquid in the cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 This is a schematic cross-sectional view of the present invention along the long axis;

[0020] Figure 3 This is a partial enlarged view of one end of the long axis of the present invention;

[0021] Figure 4 This is a structural diagram of the angle control mechanism of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the present invention installed in a liquid tank. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is described in detail below with reference to the embodiments and drawings.

[0024] like Figure 1 and Figure 2 As shown, the rotatable cover for suppressing liquid tank sloshing described in the present invention includes a cover 1 for reducing the degree of liquid sloshing in the liquid tank. An axial hole 11 is provided in the middle of the cover 1 perpendicular to the direction of liquid flow. The long axis 2 passes through the axial hole 11, and both ends are fixed to the lifting rod 4 through a knob mechanism 3. The cover 1 swings freely around the long axis 2 as the liquid in the liquid tank sloshes.

[0025] A locking mechanism 5 is provided at both ends of the shaft hole 11 to prevent the cover plate 1 from rotating around the long axis 2. The locking mechanism 5 is provided with internal and external threads. The internal threads are used to screw the locking mechanism 5 from both ends of the long axis 2 toward the cover plate 1, and the external threads are used to match the locking mechanism 5 with the internal threads at both ends of the shaft hole 11. When the locking mechanism 5 is screwed into the shaft hole 11, the swing of the cover plate 1 is restricted, so that it remains in a horizontal state, thereby suppressing liquid sloshing to the greatest extent.

[0026] like Figure 3 As shown, a plurality of groups of arc grooves 13 of different lengths are provided on one side of both ends of the shaft hole 11. According to the distance between each group of arc grooves 13 and the long axis 2, angle control mechanisms 6 of different lengths are provided to control the rotation angle of the cover 1 around the long axis 2. One end of the angle control mechanism 6 is fixed on the long axis 2, and the other end is buckled in the arc groove 13.

[0027] like Figure 4 As shown, one end of the angle control mechanism 6 is a sleeve 61 with an internal thread, and the internal thread of the sleeve is used to fix the angle control mechanism 6 on the long axis 2, and the other end is an L-shaped control rod 62; a right-angled side of the L-shaped control rod 62 is buckled in the arc groove 13, and moves in the arc groove 13 as the cover plate 1 rotates around the long axis 2. In this embodiment, three groups of arc grooves 13 are provided, and their lengths are such that the rotation angles of the cover plate 1 around the long axis 2 are 30°, 20°, and 10°, respectively. The width of the arc groove 13 is greater than the cross-sectional width of the L-shaped control rod 62, ensuring that the cover plate 1 can rotate freely within the specified degree along with the L-shaped control rod 62.

[0028] The length and width of the cover plate 1 should be smaller than the cross section of the liquid tank. The specific length should be determined based on the fact that the cover plate 1 will not touch the bottom or top of the tank when the rotation angle is maximum at the lowest or highest liquid loading rate. That is, the total length of the cover plate 1 is required to be no more than 1.2 times the height H of the liquid tank.

[0029] A circle of through holes 12 is provided around the plane of the cover plate 1 to reduce the impact force of the liquid. The through holes 12 are completely symmetrical about the horizontal center line of the cover plate 1 itself. When the liquid tank is in motion, the liquid will hit the cover plate 1, and the liquid below the free liquid surface in the liquid tank will pass through the through holes 12 on the cover plate 1, reducing the impact force of the liquid on the cover plate 1. The through holes 12 have a rectifying effect on the liquid, so that the liquid swaying onto the cover plate 1 flows under the cover plate 1, and also reduces the climbing of the swaying free liquid surface along the bulkhead, thereby reducing the impact of the liquid on the bulkhead.

[0030] The cover plate 1 has a lower density than the liquid in the tank. In a stable state, the horizontal centerline of the cover plate 1 lies at the free surface of the liquid. When sloshing occurs within the tank, the cover plate 1 suppresses free surface motion, thereby reducing the degree of liquid sloshing. When suspended in the liquid, the horizontal centerline of the cover plate 1 lies at the free surface of the liquid.

[0031] One end of the knob mechanism 3 is a cylinder 31 with an internal thread, which is screwed onto the two ends of the long shaft 2 through the internal thread of the cylinder 31. The other end is a knob handle, and an annular flange is provided between the cylinder 31 and the knob handle.

[0032] The top of the lifting rod 4 is provided with a buckle 41 that is sleeved on the cylinder 31. The buckle 41 is two circular rings with an inner diameter the same as the outer diameter of the cylinder 31. One of the circular rings is welded to the top of the lifting rod 4. One end of the two circular rings is connected by a hinge, and the other end is fastened to the outer ring of the cylinder 31 with bolts and nuts. The outer diameter of the annular flange is larger than the outer diameter of the buckle 41, which is used to limit the movement of the buckle 41 to both sides of the long axis 2.

[0033] Lifting rods 4 are multi-stage structures that adjust the height of cover plate 1 according to the level of liquid in the tank. When the liquid loading rate is low, the height of cover plate 1 can be controlled by adjusting the height of lifting rods 4 to keep it near the free liquid surface, thereby limiting free surface movement and better suppressing liquid sloshing in the tank. A through hole 42 is provided at the lower end of lifting rods 4 for securing it within the tank.

[0034] like Figure 5 As shown, in this embodiment, the lowest height of the lifting rod 4 is no higher than 1 / 3 of the vertical height of the liquid tank, and the highest height exceeds the total vertical height of the liquid tank.

[0035] The cover plate 1 has a wide range of movement within the tank, adapting to tanks with varying liquid loading ratios. For example, when the LNG loading ratio is between 30% and 70%, sloshing is most intense, and the tank's damage to the bulkhead is most severe. At this point, the cover plate 1 floats along the free surface, and the natural frequency changes in real time, minimizing resonance and effectively suppressing liquid sloshing within the tank.

[0036] When the liquid loading rate is between 30% and 70%, the rotation angle of cover plate 1 can be adjusted to suit different sloshing conditions. When the liquid loading rate is low, slamming is more likely to occur, which can damage the bulkhead. The rotation angle of cover plate 1 can be controlled at 10° to reduce this. When the liquid loading rate is high, the free surface deforms significantly, making top impact more likely. The rotation angle of cover plate 1 can be controlled at 10° to prevent top impact damage to the bulkhead. When the liquid loading rate is at an intermediate level, the rotation angle can be adjusted to 30°, allowing cover plate 1 to move more widely with the free surface, thereby reducing liquid damage to the bulkhead.

[0037] When the liquid loading rate is lower than 30% or higher than 70%, the cover plate 1 is adjusted to the free liquid surface by the lifting rod 4, and the cover plate 1 is fixed to a horizontal state, and the locking mechanism 5 is tightened. At this time, the cover plate 1 is completely fixed and does not move, that is, there is no risk of damaging the bulkhead, and the cover plate can also play a good anti-swaying effect.

[0038] In the present invention, structures in contact with liquid, such as the cover plate 1, the long shaft 2, the knob mechanism 3, the lifting rod 4, the locking mechanism 5, and the angle control mechanism 6, are all coated with or made of materials that avoid physical and chemical reactions with the liquid in the cabin.

Claims

1. A rotatable cover for suppressing tank sloshing, characterized by: The invention comprises a cover plate (1) for reducing the sloshing degree of liquid in a liquid tank. The middle part of the cover plate (1) is provided with an axial hole (11) perpendicular to the flow direction of the liquid. The long axis (2) passes through the axial hole (11), and the two ends are fixed to the lifting rod (4) through a knob mechanism (3). The cover plate (1) swings freely around the long axis (2) as the liquid in the liquid tank sloshes. The two ends of the shaft hole (11) are provided with locking mechanisms (5) for preventing the cover plate (1) from rotating around the long axis (2). One side of the two ends of the shaft hole (11) is also provided with multiple groups of arc grooves (13) of different lengths. According to the distance between each group of arc grooves (13) and the long axis (2), angle control mechanisms (6) of different lengths are provided to control the rotation angle of the cover plate (1) around the long axis (2). One end of the angle control mechanism (6) is fixed on the long axis (2), and the other end is buckled in the arc groove (13); The cover plate (1) is provided with a circle of through holes (12) on the periphery of the plane for reducing the impact force of the liquid; The weight of the cover plate (1) is such that when it is suspended in the liquid, the horizontal center line of the cover plate (1) is located at the free surface of the liquid; The total length of the cover plate (1) is required to be no greater than 1.2 times the tank height H; When the liquid carrying rate is between 30% and 70%, the rotation angle of the cover plate (1) is changed in accordance with different sloshing conditions, and the cover plate 1 moves along with the floating free surface; When the liquid carrying rate is lower than 30% or higher than 70%, the cover plate (1) is fixed horizontally to the free liquid surface.

2. The rotatable cover plate for suppressing liquid tank sloshing according to claim 1, characterized in that: One end of the knob mechanism (3) is a cylinder (31) with an internal thread, which is screwed onto the two ends of the long shaft (2) through the internal thread of the cylinder (31).

3. The rotatable cover plate for suppressing liquid tank sloshing according to claim 2, characterized in that: The top end of the lifting rod (4) is provided with a buckle (41) which is sleeved on the cylinder (31), and the buckle (41) is tightened on the outer ring of the cylinder (31) with bolts and nuts.

4. The rotatable cover plate for suppressing tank sloshing according to claim 3, characterized in that: The lifting rod (4) is a multi-stage lifting structure, and the height of the cover plate (1) is adjusted according to the height of the liquid in the liquid tank.

5. The rotatable cover plate for suppressing liquid tank sloshing according to claim 4, characterized in that: The lower end of the lifting rod (4) is provided with a through hole (42) for fixing it in the liquid tank.

6. The rotatable cover plate for suppressing tank sloshing according to claim 1, characterized in that: The locking mechanism (5) is provided with internal and external threads, the internal threads being used to screw the locking mechanism (5) from both ends of the long shaft (2) toward the cover plate (1), and the external threads being used to match the locking mechanism (5) with the internal threads at both ends of the shaft hole (11).

7. The rotatable cover plate for suppressing liquid tank sloshing according to claim 1, characterized in that: One end of the angle control mechanism (6) is a sleeve (61) with an internal thread, and the internal thread of the sleeve is used to fix the angle control mechanism (6) on the long shaft (2), and the other end is an L-shaped control rod (62).

8. The rotatable cover plate for suppressing liquid tank sloshing according to claim 7, characterized in that: A right-angled side of the L-shaped control rod (62) is buckled in the arc groove (13) and moves in the arc groove (13) as the cover plate (1) rotates around the long axis (2).

Images