A ship liquid tank liquid oscillation device

Abstract

The present application relates to a kind of ship liquid tank liquid oscillation device, including triangular oscillation device, plane oscillation device, single damping pulley, two triangular oscillation devices are connected by plane oscillation device, and float on the surface of liquid level, two sides are connected on the structure bulkhead and liquid tank pillar of ship liquid tank by single damping pulley respectively to form liquid oscillation device, liquid oscillation device can change with the change of liquid level by two sides of single damping pulley, and always cover liquid level.The device is slid by pulley, is not directly welded with ship structure, does not participate in ship structure strength;Except buoyancy block, the rest structure is provided with lightening hole, facilitates liquid circulation, and does not occupy cabin capacity;It is made of steel structure, low in cost, light in weight.

Description

Technical Field

[0001] This invention relates to a ship liquid tank, and more particularly to a device for ships with large liquid tanks to prevent the liquid inside the tank from sloshing during ship navigation, causing the hull to roll more violently and thus compromising the ship's stability. Background Technology

[0002] When existing large ships, such as oil tankers or other large liquid transport vessels, encounter severe sea conditions during navigation, resulting in a large heel angle, the liquid inside the tanks will also be affected by the heel. Consequently, the movement of the liquid inside the tanks will increase the ship's heel angle, compromise the ship's stability, and increase the probability of accidents.

[0003] Normally, during normal navigation, the ship's center of gravity and center of buoyancy are almost on the same vertical line, located near the ship's centerline. Figure 1 As shown.

[0004] However, when encountering severe sea conditions and the ship begins to list, such as Figure 2 As shown, the center of gravity of the liquid inside the tank shifts when the ship heels, moving from center of gravity 1 to center of gravity 2, and the center of buoyancy moves from position 1 to position 2. At this time, the positions of the center of buoyancy, center of gravity, and center of stability create an additional stabilizing moment, enabling the ship to right itself and return to a stable state, preventing it from becoming unstable and capsizing.

[0005] However, when the liquid level in the tank changes significantly due to sloshing, such as... Figure 3 As shown, when the center of gravity moves instantaneously to the center of gravity 3, the additional torque generated at this time will reduce the weakening effect of the hull stabilizing torque on the hull's rolling, or even fail, thus leading to capsizing.

[0006] The sloshing of liquids within tanks has a clear detrimental effect on ship stability. Ship designers employ various methods to reduce the angle of heel roll, such as gyroscopes, bilge keels, anti-roll tanks, and anti-roll fins. While these methods can indeed reduce the ship's heel angle, design flaws still exist. Among these:

[0007] (1) Gyroscopes are usually only used in small ships under 10 meters in length. They are not effective for large ships.

[0008] (2) The anti-roll fins and bilge keels generate additional resistance to the ship. The anti-roll fins are prone to damage when they extend beyond the ship's side during operation and occupy a certain amount of ship space.

[0009] (3) Anti-roll tanks are generally suitable for ships with large spaces. If they also have large liquid tanks, multiple high-power pumps with extra capacity are required to regulate the ballast water in order to achieve the purpose of anti-roll. Pumps, valves and other components are vulnerable parts. If one of them fails, the anti-roll capability will be lost instantly.

[0010] (4) Add vertical bulkheads inside the tank to suppress liquid movement. The added bulkheads need to be connected to the tank walls and their structural strength needs to be considered, which may increase the weight of the ship.

[0011] In conclusion, liquid sloshing during ship navigation is indeed a challenging problem, and experts in the field have explored various solutions. However, no perfect solution has been found. Therefore, a novel device is needed, with a structure different from existing technologies, emphasizing economy, practicality, and innovation through a simple design. Summary of the Invention

[0012] The present invention provides a liquid oscillation control device for ship liquid tanks. The device is made of steel structure and equipped with buoyancy blocks and one-way damping pulleys. It does not participate in the structural strength of the ship, saves space, and is inexpensive.

[0013] To achieve the above objectives, the technical solution of the present invention is: a liquid sway control device for a ship's liquid tank, comprising a triangular sway control device, a planar sway control device, and a one-way damping pulley. Two triangular sway control devices are connected by the planar sway control device and float on the liquid surface. The two sides are respectively connected to the structural bulkhead and the liquid tank support of the ship's liquid tank by one-way damping pulleys to form a liquid sway control device. The liquid sway control device can change with the liquid level height through the one-way damping pulleys on both sides and always cover the liquid surface.

[0014] Furthermore, the triangular oscillation device and the planar oscillation device are connected by a hinge.

[0015] Furthermore, the single-phase damping pulley is fixedly connected to the triangular oscillation device, which can ensure the stability and structural strength of the triangular oscillation device frame.

[0016] Furthermore, the triangular oscillation device and the planar oscillation device are equipped with large water flow holes, which make the pressure on the upper and lower surfaces the same, thus avoiding structural deformation and damage.

[0017] Furthermore, the one-way damping pulley has a one-way damping function, which makes the liquid sway control device less likely to rise with the fluctuation of the liquid surface, or rise slowly, thus suppressing the swaying of the liquid surface and thus preventing damage to the stability of the ship.

[0018] Furthermore, when the triangular anti-sway device and the planar anti-sway device move up with the liquid level, the one-way damping pulley is damped, which restricts its upward movement and inhibits the rise of the liquid level, preventing the liquid from rising and thus weakening the protection of the righting moment for the stability of the ship, leading to the capsizing of the hull.

[0019] Furthermore, a buoyancy block is installed at the bottom of the triangular oscillation device, allowing it to float on the liquid surface and adhere to the liquid surface.

[0020] Furthermore, the tripods of the two triangular oscillation devices in the liquid oscillation device have a height difference, so that the height of the tripod in the middle of the liquid tank is greater than the height of the tripod at the connection with the tank wall. This is used to make the liquid in the liquid tank flow more easily to the middle of the liquid tank and suppress the rise of the liquid level at the two side tank walls.

[0021] Furthermore, the single-phase damping pulley is equipped with a top pulley limit block and a bottom pulley limit block at both ends of the slide along the structural bulkhead and liquid tank support, so that the liquid sway control device will not damage the top and bottom structures of the liquid tank as the liquid level rises.

[0022] Furthermore, liquid control devices made of steel structures or other materials offer greater corrosion resistance, rigidity, and toughness.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] (1) It does not participate in the strength of the hull. This device slides through pulleys and is not directly welded to the hull structure, so it does not participate in the strength of the hull structure.

[0025] (2) Saves space. Except for the buoyancy blocks, the rest of the structure is equipped with light-reducing holes to facilitate liquid flow and does not take up cabin space.

[0026] (3) It is inexpensive, mainly made of steel structure, with low cost and light weight. Attached Figure Description

[0027] Figure 1 This is a schematic diagram showing the position of the center of gravity and center of buoyancy of a conventional ship.

[0028] Figure 2 This is a schematic diagram showing the positions of the center of buoyancy and the center of gravity under tilting conditions;

[0029] Figure 3 This is a side view of a drilling ship.

[0030] Figure 4 This is a schematic diagram of a liquid tank anti-sloshing device;

[0031] Figure 5 This is a schematic diagram of a ship's liquid tanks being normally loaded with liquid and related equipment;

[0032] Figure 6 This is a schematic diagram showing the liquid level position and device status when the ship is listing.

[0033] Figure 7 This is a schematic diagram illustrating the features of liquid sloshing control in a ship's liquid tank.

[0034] Figure 8 This is a top view of the bottom structure of the triangular oscillation device (with buoyancy blocks);

[0035] Figure 9This is a top view of the triangular oscillation control device (without the buoyancy block);

[0036] In the diagram: 1: Triangular oscillation control device, 11: Buoyancy block, 12: Hinge, 13: One-way damping pulley, 14: Water flow hole, 15: Structural reinforcing rib, 2: Planar oscillation control device, 3: Liquid tank support, 31: Top pulley limit stop, 32: Bottom pulley limit stop, 33: Structural bulkhead. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] like Figures 4 to 9 As shown, an embodiment of the present invention provides a liquid sway control device for a ship's liquid tank, including a triangular sway control device, a planar sway control device, and a one-way damping pulley.

[0039] This example Figure 4 The hull's liquid tanks are divided into three completely independent compartments (port side liquid tank, intermediate liquid tank, and starboard side liquid tank). Figure 4 (Only a portion of the port side and intermediate liquid tanks are shown in the image). The technical feature of this device is that a triangular anti-swelling device 1 and a planar anti-swelling device 2, both with buoyancy blocks 11, float on the liquid surface. One-way damping pulleys 13 on both sides allow them to change with the liquid level, always covering the surface. The one-way damping pulleys 13 have a one-way damping function; when the triangular anti-swelling device 1 and the planar anti-swelling device 2 rise with the liquid level, the one-way damping pulleys 13 provide damping, restricting their upward movement and thus inhibiting the liquid level from rising and preventing... Figure 3 The upward movement of the liquid weakens the righting moment's protection of the ship's stability, leading to the capsizing of the vessel.

[0040] This example Figure 4 In the process, the single-phase damping pulley 13 is provided with a top pulley limit block 31 and a bottom pulley limit block 32 at the upper and lower ends of the structural bulkhead 33 and the liquid tank support 3, so that the device will not damage the structure at the top and bottom of the liquid tank as the liquid level rises.

[0041] like Figure 5 As shown, when the liquid tank is filled with liquid, the entire device is suspended on the surface of the liquid, covering the liquid surface.

[0042] like Figure 6 As shown, the device can still cover the liquid surface when the hull is listing. The one-way damping pulley 13 has a built-in damping system. When the hull is listing, the liquid tilts to one side of the hull, and the liquid surface rises, causing the device to slide upward. The damping system will inhibit the one-way damping pulley 13 from moving upward.

[0043] like Figure 7As shown, the triangular anti-roll device in this apparatus also has a height difference in the liquid tank. Its purpose is to make the liquid level near the bulkhead rise when the ship lists. Under the pressure of the low-position triangular frame of this apparatus, it is less likely for the liquid level to rise.

[0044] like Figure 8 As shown, each device consists of two triangular oscillation devices 1 and a planar oscillation device 2. The triangular oscillation device 1 has a stable structure and is connected to a one-way damping pulley 13. The planar oscillation device 2 in the middle connects the two triangular oscillation devices 11 through a hinge 12 to keep the whole device stable.

[0045] The device is equipped with drainage holes 14. Without these holes, the device would adhere to the liquid surface, creating a localized vacuum. As the liquid sloshes, this would cause significant localized stress on the device, potentially damaging the structure. The drainage holes also reduce the structural weight. The structural reinforcing ribs 15 are designed to ensure the stability of the steel structure.

[0046] like Figure 9 As shown, the purpose of this structure is to ensure the stability of the triangular frame while also ensuring the structure is lightweight.

Claims

1. A liquid sloshing device for a ship's liquid tank, characterized in that: The system comprises a triangular oscillation control device, a planar oscillation control device, and a one-way damping pulley. Two triangular oscillation control devices are connected via a planar oscillation control device and float on the liquid surface. The two sides are connected to the structural bulkheads and supports of the ship's liquid tank via one-way damping pulleys, forming a liquid oscillation control device. The liquid oscillation control device, through the one-way damping pulleys on both sides, can change with the liquid level and always cover the liquid surface. The triangular and planar oscillation control devices are connected by hinges. The one-way damping pulleys are fixedly connected to the triangular oscillation control device, ensuring the stability and structural strength of the triangular oscillation control device's frame. A buoyancy block is installed at the bottom of the triangular oscillation control device, allowing it to float on the liquid surface and adhere to it. The triangular brackets of the two triangular oscillation control devices have a height difference, with the height of the bracket in the middle of the liquid tank being greater than the height of the bracket connected to the bulkhead. This facilitates the flow of liquid in the liquid tank towards the center, suppressing the rise of the liquid level at the side bulkheads.

2. The liquid sloshing device for ship liquid tanks according to claim 1, characterized in that: Both the triangular and planar oscillation control devices are equipped with large water flow holes. These large water flow holes ensure that the pressure on the upper and lower surfaces is the same, thus preventing structural deformation and damage.

3. The liquid sloshing device for ship liquid tanks according to claim 1, characterized in that: The one-way damping pulley has a one-way damping function, which makes the liquid sloshing device less likely to rise with the fluctuation of the liquid surface, or rise slowly, thus suppressing the sloshing of the liquid surface and thus preventing damage to the stability of the ship.

4. The liquid sloshing device for ship liquid tanks according to claim 3, characterized in that: When the triangular and planar anti-sway devices move upward with the liquid level, the one-way damping pulleys are damped, restricting their upward movement and inhibiting the rise of the liquid level. This prevents the liquid from rising and weakens the protection of the righting moment for the stability of the ship, leading to the capsizing of the hull.

5. The liquid sloshing device for ship liquid tanks according to claim 1, characterized in that: The single-phase damping pulley has a top pulley limit stop and a bottom pulley limit stop at both ends of the slide along the structural bulkhead and liquid tank support, so that the liquid swaying device will not damage the top and bottom structure of the liquid tank as the liquid level rises.

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