Device for slowing down sloshing of liquid tank

Abstract

The invention discloses a device for slowing down sloshing of a liquid tank. The device comprises the liquid tank, a linear guide rail sliding mechanism, a combined swash plate device and an automatic springback swash plate device. According to the device for slowing down the sloshing of the liquid tank, a double-sloshing-reduction method is adopted, firstly, the amplitude of the sloshing wave height of the free liquid surface and the kinetic energy of liquid sloshing are weakened in the middle of the liquid tank by means of the automatic rebound swash plate device; liquid sloshing energy is dissipated by means of holes of the combined swash plate device for liquid to enter and exit from the bulkhead, direct action of free surface movement of the liquid on the side wall of the liquid tank is hindered, impact load of liquid sloshing on the bulkhead is reduced, and the phenomena of top rushing and jet flow caused by climbing along the bulkhead are inhibited. Meanwhile, the position of the combined oscillation suppression plate device can be adjusted by means of the linear guide rail sliding mechanism, the energy of liquid oscillation can be dissipated to the maximum extent, meanwhile, the inherent frequency of the liquid tank is changed, resonance can be effectively avoided, and therefore the wave absorption and stabilization effects of the oscillation suppression device can be better exerted.

Description

Technical Field

[0001] The invention relates to the technical field of ship liquid transportation, and in particular to a device for slowing down the sloshing of a liquid tank. Background Art

[0002] The problem of tank sloshing is widely present in the aerospace, shipbuilding, and vehicle industries. The movement of the ship on the waves excites the liquid in the tank to slosh. The sloshing is highly nonlinear and random, and produces a large impact pressure on the tank wall, especially when the tank is partially loaded with liquid, which will cause local damage to the tank structure. When the external excitation frequency is close to the natural frequency of the free liquid surface in the tank, the liquid sloshes most violently, that is, resonance sloshing occurs. The violently sloshing liquid will generate a huge hydrodynamic pressure on the tank wall, endangering the safety of the tank. At the same time, large sloshing will also produce a capsizing moment, affecting the stability of the ship.

[0003] Liquid tank sloshing is one of the important safety issues that need to be considered when loading liquid inside a large liquid storage tank, and it is also one of the important contents of the structural safety assessment of the liquid tank. The anti-sloshing devices currently used are mostly single vertical plates with holes or horizontal plates with holes. In particular, the vertical plates with holes are directly subjected to the positive impact pressure of liquid sloshing, and the risk of fracture failure is relatively high. When the ship is partially loaded and in complex sea conditions, the liquid sloshing causes dangerous sloshing pressure on the bulkhead, which cannot be suppressed ideally by existing devices. For elastic anti-sloshing plates, they rely on their own elastic deformation to absorb and weaken the kinetic energy of liquid sloshing, which is indeed better than previous anti-sloshing plates, but the possibility of fatigue fracture needs to be considered if there is long-term periodic elastic deformation. Summary of the invention

[0004] Purpose of the invention: The present invention provides a device for slowing down the sloshing of a liquid tank, solving the problem of how to effectively suppress the sloshing of liquid.

[0005] Technical solution: A device for slowing down the sloshing of a liquid tank proposed by the present invention comprises a liquid tank, a linear guide sliding mechanism located on the inner wall of the liquid tank, a combined sloshing plate device installed on the linear guide sliding mechanism, and an automatic rebound sloshing plate device fixed in the liquid tank; the linear guide sliding mechanism comprises a guide rail and a slider; the automatic rebound sloshing plate device is arranged at a predetermined position in the liquid tank along the longitudinal vertical direction, and the two sides of the automatic rebound sloshing plate device are connected to the tank 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 on the fixed frame in the form of a linear array along the vertical and horizontal directions, a plurality of transverse semicircular grooves are provided on the surface of the sloshing plate at equal intervals, and the two ends of the tension spring are respectively connected to the sloshing plate and the fixed frame; the combined sloshing plate device comprises a horizontal open hole medium plate and a semicircular open hole medium plate, the two ends of the semicircular open hole medium plate are respectively connected to the horizontal open hole medium plate, and the horizontal open hole medium plate is slidably connected to the guide rail through the slider.

[0006] Preferably, a groove for fixing the guide rail is formed in the inner wall of the liquid tank in the vertical direction.

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

[0008] Preferably, the automatic rebounding anti-swing plate device is provided with a bolt, both ends of the anti-swing plate are connected to the bolt, and the round shaft of the bolt is inserted into the fixed position in the reserved holes at both ends of the anti-swing plate.

[0009] Preferably, the automatic rebounding anti-swing plate device is further provided with a compression spring, which is installed in the reserved space on both sides of the bolt and fixedly connected to the bolt and the rotating push plates at both ends of the anti-swing plate.

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

[0011] Preferably, the openings of the horizontally perforated medium plate are in the shape of strip holes, and the openings of the semicircular perforated medium plate are in the shape of circular holes.

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

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

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

[0015] Beneficial effects: (1) The present invention can suppress the sloshing of liquid tanks to a certain extent, and has double sloshing reduction from the tank to the bulkhead. In the tank, the automatic rebound sloshing plate device is used to passively apply the restoring force of the spring to restore the elastic deformation in the opposite direction of the sloshing liquid flow by utilizing the deformation of the spring. At the same time, the advantage of the traditional vertical sloshing plate in frontally hindering the sloshing of liquid is also utilized, consuming most of the kinetic energy of the liquid sloshing and slowing down the movement of the free surface; in the bulkhead, the combined sloshing plate device is used to increase the resistance of the sloshing liquid, make the liquid produce bubble vortex, break the liquid and inhibit the liquid from climbing along the bulkhead, so as to consume the kinetic energy and potential energy of the sloshing wave, reduce the sloshing impact load and weaken the degree of the top and jet phenomena, so as to achieve the effect of maximally suppressing sloshing. (2) The present invention can be used in the liquefied natural gas transportation operation process with different liquid carrying heights. By adjusting the immersion depth of the combined sloshing plate in the liquid tank, on the one hand, the maximum dissipation of the energy of the liquid sloshing is achieved, and on the other hand, the resonance frequency of the sloshing is changed, so as to give full play to the sloshing effect of the combined sloshing plate. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 It is a structural schematic diagram of the automatic rebound anti-sway plate device of the present invention;

[0018] Figure 3 It is a partial structural schematic diagram of the swing control plate of the present invention;

[0019] Figure 4 It is a partial detail schematic diagram of the automatic rebound anti-sway plate device of the present invention;

[0020] Figure 5 It is a structural schematic diagram of the combined swing control plate device of the present invention;

[0021] Figure 6 It is a schematic structural diagram of a linear guide rail, a slider and a combination of the linear guide rail sliding mechanism of the present invention;

[0022] Figure 7 It is a schematic diagram of the combined structure of the combined anti-sway plate device and the linear guide rail sliding mechanism of the present invention. DETAILED DESCRIPTION

[0023] The present invention provides a device for reducing sloshing of a liquid tank, such as Figure 1 As shown, it includes a liquid tank 1, an automatic rebounding anti-sway plate device 2, a combined anti-sway plate device 3 and a linear guide sliding mechanism 4.

[0024] The liquid tank 1 is a box structure and is arranged in a ship. The inner 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 transverse frame 11 at a predetermined position of the automatic rebound damping plate device 1 in the tank, which corresponds to the transverse frame 251 of the fixed frame 25 in a one-to-one manner to enhance the strength of the fixed frame.

[0025] The automatic rebounding anti-sway plate device 2 is composed of an anti-sway plate 21, a compression spring 22, a tension spring 23, a bolt 24 and a fixed frame 25, which is arranged at a predetermined position in the cabin along the longitudinal vertical direction and connected to the cabin wall on both sides. The anti-sway plate 21 is arranged in a linear array along the vertical and horizontal directions, and a plurality of transverse semicircular arc grooves are provided on the surface at equal intervals, because when the liquid is blocked by the anti-sway plate 21, it will climb along the surface of the anti-sway plate 21, and the grooves on the surface of the anti-sway plate 21 can play a role in hindering the climbing of the liquid to a certain extent. The two ends of the anti-sway plate 21 are connected to the bolt 24, and the round shaft of the bolt 24 is inserted into the fixed position in the reserved holes at the two ends of the anti-sway plate 21, so that the anti-sway plate 21 can rotate freely without moving left and right.

[0026] The compression spring 22 is curved in an arc shape, installed in the reserved space on both sides of the bolt 24 and fixedly connected to the bolt 24 and the rotating push plates 211 at both ends of the swing control plate 21. When the liquid in the liquid tank sways, the swing control plate 21 rotates clockwise or counterclockwise, so that the rotating push plate 211 of the swing control plate 21 compresses the spring on one side and stretches the spring on the other side.

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

[0028] The rigid anti-sloshing plate directly bears the sloshing impact load by its own rigidity and strength, thereby reducing the sloshing effect. For the severe sloshing under the most unfavorable working conditions, a higher-strength rigid anti-sloshing plate is required, which increases the cost. The flexible anti-sloshing 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 this risk needs to be considered. The device of the present invention utilizes the higher tensile and compressive strength and good buffering effect of the spring to achieve the expected or even better effect in suppressing the sloshing of the liquid tank.

[0029] The combined swing control plate device 3 includes two horizontal perforated medium plates 31 and a semicircular perforated medium plate 32. The horizontal perforated medium plates 31 and the semicircular perforated medium plates 32 are evenly provided with a plurality of holes, wherein the opening shape of the horizontal perforated medium plates 31 is a slat hole, and the opening shape of the semicircular perforated medium plates 32 is a circular hole. The semicircular perforated medium plates 32 are connected to the two horizontal perforated medium plates 31 respectively, and the two horizontal perforated medium plates 31 are slidably connected to the liquid tank 1 through the linear guide sliding mechanism 3, and a certain gap is left between the two ends and the tank wall surface.

[0030] The linear guide sliding mechanism 4 includes a guide rail 41 and a slider 42. The guide rail 41 is fixed in the groove of the bulkhead in the liquid tank 1 along the vertical direction. The slider 42 is fixed on two horizontally perforated medium plates 31. The slider 42 is slidably connected to the guide rail 41 and is provided with a limit hole 411. A certain gap is left between the slider 42 and the bulkhead. By means of the linear guide sliding mechanism 4, the height position of the combined sloshing plate device 3 can be adjusted to put it in the best position, which can dissipate the energy of liquid sloshing to the maximum extent on the one hand, and change the natural frequency of the liquid tank 1 on the other hand, which can effectively avoid resonance, thereby better exerting the sloshing control function of the sloshing control device.

[0031] The device of the present invention adopts a double sloshing reduction method. First, the amplitude of the free liquid surface sloshing wave height and the kinetic energy of the liquid sloshing are weakened by the automatic rebound plate device 2 in the middle of the liquid tank 1. Secondly, when the liquid reaches the bulkhead, the pores of the horizontal perforated medium plate 31 and the semicircular perforated medium plate 32 in the combined sloshing control plate device 3 for liquid to enter and exit the bulkhead are used to dissipate the energy of the liquid sloshing, thereby reducing the impact load of the liquid sloshing on the bulkhead and suppressing its climbing along the bulkhead to cause the top and jet phenomenon. The device of the present invention can achieve the expected effect in suppressing the sloshing of the liquid tank.

Claims

1. A device for reducing tank sloshing, characterized in that: The invention comprises a liquid tank (1), a linear guide sliding mechanism (4) located on the inner wall of the liquid tank (1), a combined damping plate device (3) installed on the linear guide sliding mechanism (4), and an automatic rebound damping plate device (2) fixed in the liquid tank (1); the linear guide sliding mechanism (4) comprises a guide rail (41) and a slider (42); the automatic rebound damping 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 damping plate device (2) are connected to the tank wall; the automatic rebound damping plate device (2) comprises a damping plate (21), a tension spring (23) and a fixed A plurality of the swing control plates (21) are arranged in a linear array in the vertical and horizontal directions on the fixed frame (25); a plurality of transverse semicircular arc grooves are provided on the surface of the swing control plates (21) at equal intervals; two ends of the tension spring (23) are respectively connected to the swing control plates and the fixed frame; the combined swing control plate device (3) comprises a horizontal perforated dielectric plate (31) and a semicircular arc perforated dielectric plate (32); two ends of the semicircular arc perforated dielectric plate (32) are respectively connected to the horizontal perforated dielectric plate (31); and the horizontal perforated dielectric plate (31) is slidably connected to a guide rail (41) via a slider (42).

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

3. The device for reducing tank sloshing according to claim 1, characterized in that: The liquid tank (1) is also provided with a plurality of transverse frames (11), and the positions of the plurality of transverse frames (11) and the transverse frames (251) on the fixed frame (25) correspond one to one.

4. The device for reducing tank sloshing according to claim 1, characterized in that: The automatic rebounding swing control plate device (2) is provided with a bolt (24), the two ends of the swing control plate (21) are connected to the bolt (24), and the round shaft of the bolt (24) is inserted into the fixed position in the reserved holes at the two ends of the swing control plate (21).

5. The device for reducing tank sloshing according to claim 4, characterized in that: The automatic rebounding swing control plate device (2) is also provided with a compression spring (22), which is installed in the reserved space on both sides of the bolt (24) and is fixedly connected to the bolt (24) and the rotating push plates (211) at both ends of the swing control plate (21).

6. The device for reducing tank sloshing according to claim 5, characterized in that: The compression spring (22) is curved in an arc shape.

7. The device for reducing tank sloshing according to claim 1, characterized in that: The opening shape of the horizontally perforated medium plate (31) is a strip hole, and the opening shape of the semicircular perforated medium plate (32) is a circular hole.

8. The device for reducing tank sloshing according to claim 7, characterized in that: The porosity of the horizontally perforated medium plate (31) is 15% to 25%, and the porosity of the semicircular perforated medium plate (32) is 10% to 20%.

9. The device for reducing tank sloshing according to claim 1, characterized in that: The thickness of the horizontal perforated medium plate (31) and the semicircular perforated medium plate (32) of the combined anti-sway plate device (3) is 30 mm. The overall width of the combined anti-sway plate device (3) accounts for 1 / 20 to 1 / 10 of the width of the liquid tank (1), and the overall height accounts for 1 / 12 to 1 / 8 of the depth of the liquid tank (1), with a certain gap between the two ends and the wall of the liquid tank.

10. The device for reducing tank sloshing according to claim 1, characterized in that: The slider (42) of the linear guide rail sliding mechanism (4) is slidably connected to the guide rail (41) and is provided with a limiting hole (411), and a certain gap is left between the slider (42) and the bulkhead.

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