KR20130012830A - Buoyancy unit and anti sloshing apparatus having the same - Google Patents

Abstract

PURPOSE: A buoyancy unit and an anti-sloshing device with the same are provided to enhance the power of a buoyancy unit to suppress sloshing. CONSTITUTION: A buoyancy unit(100) comprises a buoyancy member(112), a form member(114), and a cover. The buoyancy member has buoyancy. The form member surrounds the buoyancy member. The cover surrounds the form member. The buoyancy member is positioned in the upper part of the form member.

Description

BUOYANCY UNIT AND ANTI SLOSHING APPARATUS HAVING THE SAME}

The present invention relates to a buoyancy unit and a sloshing suppression apparatus including the same, and more particularly, to a buoyancy unit for suppressing sloshing in a cargo hold and a sloshing suppression apparatus including the same.

In general, various types of ships are being manufactured to transport liquid cargo by sea. For example, in order to transfer liquid cargoes such as liquefied natural gas (LNG), liquefied petroleum gas (LPG), and crude oil (crude oil), hulls are manufactured according to the characteristics of each cargo. Special types of liquid cargo storage tanks have been applied to keep them sealed and warm.

One of the major loading conditions in the manufacture of such hull and liquid cargo storage tanks is the sloshing problem. Sloshing is a liquid cargo having a free surface because the liquid cargo receives kinetic energy continuously due to the movement of the hull. As referring to the behavior of a fluid that shakes sharply and causes a strong impact on the inner wall of the liquid cargo storage tank, this sloshing is considered from the beginning of the construction of the hull and the liquid cargo storage tank.

As such, the shape of the hull and the liquid cargo storage tank has been designed to minimize the sloshing caused by the liquid cargo and at the same time to withstand the expected sloshing load. In order to avoid the sloshing load, Shipowners had to accept conditional service conditions with limited cargo load. Nonetheless, due to the uncertainty of the sloshing load, various problems with the damage of unexpected liquid cargo storage tanks continue to arise.

This problem of sloshing has to be solved not only in ships but also in fuel tanks in aerospace, aviation, and automobile fields.In contrast to ships, in the case of ships or aircrafts, fuel tanks are caused by rapid maneuvers such as 360-degree rotation. The problem of sloshing in the direction of controlling the flow of liquid cargo, such as liquid fuel, is not a matter of simply reinforcing the structure of the fuel tank, but rather a smooth supply of fuel, due to the rapid fluid behavior. Has been solved.

In addition, the conventional liquid cargo storage tanks to prevent sloshing by the liquid cargo in most of the liquid cargo storage tank is filled with a buoy of a porous material is adopted to suppress the movement of the liquid cargo.

The above anti-sloshing method is theoretically possible, but in the case of marine liquid cargo storage tanks, the inside of the liquid cargo storage tank is so large that it is not practically easy to completely fill the buoys. It is difficult to adopt because it is cumbersome to remove it again.

In addition, for ships, it is not only easy to make buoys of liquid cargo storage tank size to suppress sloshing, but also it is difficult to make buoys suitable for cryogenic environments such as LNG, and it is difficult to produce buoys to prevent sloshing. When the buoy is manufactured to be integral with the cargo storage tank, even though these buoys are designed to withstand the behavior of the liquid cargo storage tank, they may damage the walls of the liquid cargo storage tank by interference with the walls of the liquid cargo storage tank. It is not only difficult to install such buoys inside the thermally sealed liquid cargo storage tank, but also has the problem of sacrificing the loading space inside the liquid cargo storage tank.

In order to solve such a sloshing problem, the applicant of the present invention discloses a plurality of buoyancy bodies having buoyancy to be suspended on the surface of a liquid in Korean Registered Patent No. 1043622 (prior document 1), and an open cell to absorb a liquid. It has been proposed a sloshing suppression apparatus having a structure having a structure and a connecting means for connecting the buoyancy body and the adjacent buoyancy body to each other.

Prior Art 1: Korean Patent No. 1043622

One embodiment of the present invention is to provide a buoyancy unit with improved sloshing suppression force and a sloshing suppression apparatus including the same.

A first aspect of the present invention includes a buoyancy body having buoyancy, a foam member surrounding the buoyancy body, and a cover surrounding the foam member, wherein the buoyancy body is located in an upper region of an entire region of the foam member. To provide.

The foam member may include a buoyancy groove in which the buoyancy body is located.

The buoyancy groove may have the same size as the buoyancy body.

The buoyancy groove may have a larger size than the buoyancy body.

In addition, the second aspect of the present invention provides a sloshing suppression apparatus including a plurality of the buoyancy units disposed adjacent to each other, and a plurality of fastening members connecting the plurality of buoyancy units to each other.

The buoyancy unit may include a plurality of connection belts installed on the cover and connected to the fastening member.

Connection rings may be formed at both ends of the connection belt.

The fastening member may include a pair of unit fastening members having a curved shape so that both ends thereof are respectively inserted into the adjacent pair of connecting links of the adjacent connecting belts of the plurality of connecting belts.

The pair of unit fastening members may be disposed so that both ends thereof face each other and may be fastened to each other by bolts.

According to one embodiment of the present invention, there is provided a buoyancy unit having an improved sloshing suppression force and a sloshing suppression apparatus including the same.

1 is a cross-sectional view showing a state in which a sloshing suppressing device according to a first embodiment of the present invention is installed in a liquid cargo storage tank.
2 is a plan view showing a state in which a sloshing suppressing device according to a first embodiment of the present invention is installed in a liquid cargo storage tank.
3 is a plan view showing a part of a sloshing suppression apparatus according to a first embodiment of the present invention.
4 is a view illustrating a state in which a fastening member is connected to two buoyancy units in the sloshing suppression apparatus according to the first embodiment of the present invention.
5 is a perspective view showing a buoyancy unit of the sloshing suppression apparatus according to the first embodiment of the present invention.
6 is a cross-sectional view taken along the line VV of FIG. 5.
7 is a cross-sectional view showing a buoyancy unit according to a second embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

1 is a cross-sectional view illustrating a state in which a sloshing suppression apparatus is installed in a liquid cargo storage tank according to a first embodiment of the present invention, and FIG. 2 is a sloshing suppression apparatus according to a first embodiment of the present invention. It is a top view which shows the state installed in the tank, and FIG. 3 is a top view which shows a part of the sloshing suppression apparatus which concerns on 1st Example of this invention. 3 is a diagram illustrating a circular dotted line region illustrated in FIG. 2.

As shown in Figures 1 to 3, the sloshing suppression apparatus according to the first embodiment of the present invention is a liquid liquefied natural gas (LNG), liquefied petroleum gas (LPG), crude oil ( It is located on the liquid cargo 2 so as to cover the surface of the liquid cargo 2 such as crude oil).

At this time, the sloshing suppressing device 10 is not hit by the sloshing suppressing device 10 such as a plurality of pipes 4 and the like for transporting the liquid, for example, LNG, which can be stored in the liquid cargo storage tank 1. The buoyancy unit, which will be described later, may not be installed in some areas so as not to hit or hit the edge of the liquid cargo storage tank 1 or the like.

The sloshing suppressing apparatus 10 includes a plurality of buoyancy units 100 arranged adjacent to each other, and a plurality of fastening members 130 connecting the plurality of buoyancy units 100 to each other. The buoyancy unit 100 includes a buoyancy block 110 having buoyancy and a plurality of connection belts 120 installed in the buoyancy block 110. The fastening member 130 connects between the connection belts 120 of the adjacent buoyancy unit 100. The buoyancy block 110 may have a cube or cuboid shape having a length of 1.0-1.5 m in width, length, and height, and vary in size or shape according to the size of the internal space of the liquid cargo storage tank 1. Can be.

The plurality of buoyancy blocks 110 are arranged in a lattice or network structure, and are simply and stably connected to each other by the connecting belt 120 and the fastening member 130 to cover the surface of the liquid cargo 2, whereby the hull is operated. When moving in various directions such as heavy pitch, roll, yaw and weaving, sloshing by the liquid cargo 2 in the liquid cargo storage tank 1 can be effectively suppressed. .

The connection belt 120 may be installed on the buoyancy block 110 by sewing or the like, and may be installed on the surface of the buoyancy block 110 using an adhesive or the like.

The fastening member 130 connects between the connection belts 120 of each of the adjacent buoyancy blocks 110. The fastening member 130 may be formed of a pair of fastening members each having a 'U' shape, but is not limited thereto. The fastening member 130 may be formed of a ring-shaped fastening member having a key ring shape or a fastening member having a square shape as a whole, or a connecting belt ( 120 may be made of the same material.

Hereinafter, a connection state between the fastening member and the connection belt will be described with reference to FIG. 4.

4 is a view illustrating a state in which a fastening member is connected to two buoyancy units in the sloshing suppression apparatus according to the first embodiment of the present invention.

As shown in FIG. 4, the fastening member 130 may connect each connection ring 124 of the pair of adjacent connection belts 120 to each other so that two buoyancy blocks 110 adjacent to each other are connected to each other. The fastening member 130 may include a pair of unit fastening members 132 disposed to be symmetrical with each other.

At this time, the fastening member 130 may be composed of a pair of unit fastening member 132 having a curved shape so that both ends can be inserted into a pair of adjacent connection ring 124, respectively, a pair of unit fastening The members 132 may be disposed so that their respective ends face each other and may be fastened to each other by means such as bolts 134 and the like.

More specifically, the pair of unit fastening members 132 may have a 'U' shape, and both ends of the pair of unit fastening members 132 may be disposed from the top to the bottom of the pair of adjacent connection rings 124. , From bottom to top, respectively.

Both ends of the pair of fastening members 130 respectively inserted into the pair of adjacent rings 124 may be located in spaced spaces between the pair of connecting belts, and the pair of fastening members 130 In this space can be easily fastened by a connection member 134, such as a bolt.

Hereinafter, the specific structure of the buoyancy unit of the sloshing suppression apparatus according to the first embodiment of the present invention will be described in detail with reference to FIGS. 5 and 6.

FIG. 5 is a perspective view illustrating a buoyancy unit of the sloshing suppressing apparatus according to the first embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along the line VV of FIG. 5.

As shown in FIGS. 5 and 6, the buoyancy block 110 has a buoyancy body 112 having buoyancy, a buoyancy groove 114a in which the buoyancy body 112 is located, and a foam member surrounding the buoyancy body 112. 114 and a cover 116 surrounding the foam member 114.

The buoyancy body 112 may have a spherical shape or may be formed of an ellipsoid or various other structures. The buoyancy body 112 may have a buoyancy force to be suspended in the liquid cargo (2), and when the liquid cargo (2) is LNG, the airtight space is filled so that the gas that is not converted to liquid phase can be filled therein even at cryogenic temperatures. It can be made of a hollow structure. The buoyancy body 112 may have a buoyancy by the structural characteristics as described above, and may also have buoyancy by the characteristics of the material. The buoyant body 112 may be made of a material having such a strength that the shape is not changed by the buoyant force. In order to sufficiently perform its function even in the cryogenic temperature state by the liquid cargo 2 such as LNG, Alloy. In addition, the buoyancy body 112 may be made of a foam material having a closed cell structure. That is, the buoyancy body 112 does not have a hollow structure but the buoyancy body 112 itself may be made of a foam material having a closed cell structure. Here, the closed cell structure is a structure capable of having buoyancy by not absorbing liquid into the buoyancy body 112, and thus, as the buoyancy body 112 is made of a foam material of the closed cell, thermal load and compression load Even if a crack is generated on the surface of the buoyancy body 112, the liquid cargo 2 does not penetrate into the buoyancy body 112, so that the buoyancy body 112 can maintain the buoyancy stably. In this case, the buoyancy body 112 may be formed of a polymer material including any one of a phenol resin, a melamine resin and a synthetic resin thereof capable of maintaining elasticity even at cryogenic temperatures in which a liquid cargo 2 such as LNG maintains a liquid phase. have. The buoyancy body 112 is located in the upper region of the entire region of the foam member 114.

The foam member 114 surrounds the surface of the buoyancy body 112. The foam member 114 may have an open cell structure in order to more effectively prevent sloshing by the liquid cargo 2 infiltrating. Here, the open cell structure is a structure in which a hole penetrating the inside and the outside of the foam member 114 is formed on the outer circumferential surface thereof, so that the surface area of the foam member 114 can be maximized, so that the liquid cargo 2 is absorbed accordingly. Can promote. As such, the foam member 114 is formed in an open cell structure so that the liquid cargo 2 penetrates into the foam member 114, so that the buoyancy block 110 floats in a state in which the liquid cargo 2 is partially submerged. The free face of the cargo 2 is covered, so that sloshing by the liquid cargo 2 in the liquid cargo storage tank 1 can be more effectively suppressed.

The foam member 114 may be made of a polymer material, for example, a phenol resin capable of absorbing the liquid cargo 2 even at cryogenic temperatures in which the liquid cargo 2 such as LNG maintains a liquid state, and may maintain elasticity. It may be made of a polymer material including any one of melamine resin and synthetic resin thereof. The foam member 114 includes a buoyancy groove 114a in which the buoyancy body 112 is located, and the buoyancy body 112 is located inside the buoyancy groove 114a. The buoyancy groove 114a is positioned in the upper region of the entire region of the foam member 114, and thus the buoyancy body 112 is positioned in the upper region of the entire region of the foam member 114. The buoyancy groove 114a has substantially the same size as the buoyancy body 112, thereby preventing the buoyancy body 112 from moving inside the buoyancy groove 114a.

In this way, the buoyancy body 112 of the buoyancy block 110 of the buoyancy unit 100 is located in the upper region of the entire region of the foam member 114, so that the buoyancy unit 100 is further added to the liquid cargo 2. It is immersed in a lot, thereby lowering the center of gravity of the overall buoyancy unit 100 suspended in the liquid cargo 2, the sloshing suppression device 10 is more stable and effectively the sloshing of the liquid cargo 2 Suppress

The cover 116 surrounds the foam member 114, thereby preventing the foam member 114 from breaking, and also preventing the liquid cargo 2 from being contaminated due to debris of some damaged foam member 114. can do. Cover 116 may be made of a material that can have the same durability at room temperature, even at cryogenic temperatures, for example, may be made of polyacrylates (polyacrilate) fibers and the like.

As described above, in the sloshing suppressing apparatus 10 according to the first embodiment of the present invention, the buoyancy body 112 is located in the upper region of the entire region of the foam member 114 and the buoyancy body 112 is located. Since the buoyancy groove 114a is substantially the same size as the buoyancy body 112 to prevent the buoyancy body 112 from moving inside the buoyancy groove 114a, the buoyancy unit 100 is applied to the liquid cargo 2. It is more submerged, which lowers the center of gravity of the entire buoyancy unit 100 suspended in the liquid cargo 2, effectively suppressing the sloshing of the liquid cargo 2. That is, the buoyancy unit 100 and the sloshing suppression apparatus 10 including the same which improve the sloshing suppression force with respect to the liquid cargo 2 are provided.

Hereinafter, with reference to FIG. 7, the buoyancy unit in the second embodiment of the present invention will be described in detail.

Hereinafter, only the characteristic portions different from the first embodiment will be described by taking excerpts, and the portions where the description is omitted are according to the first embodiment. In the second embodiment of the present invention, for convenience of description, the same constituent elements will be described using the same reference numerals as in the first embodiment of the present invention.

7 is a cross-sectional view showing a buoyancy unit according to a second embodiment of the present invention.

As shown in FIG. 7, the buoyancy groove 114a of the buoyancy block 110 of the buoyancy unit 102 according to the second embodiment of the present invention has a larger size than the buoyancy body 112. Thus, the buoyancy body 112 is located in the upper region of the entire area of the foam member 114 in the buoyancy groove 114a, the buoyancy body 112 is located in the space of the remaining buoyancy groove 114a in the liquid cargo ( 2) is filled.

On the other hand, the buoyancy groove 114a of the buoyancy block 110 according to the second embodiment of the present invention has a circular cross-section in its entirety, but is not limited thereto, and is not limited to the shape of a square, triangle, polygon or closed loop. May have

As described above, the buoyancy unit 102 according to the second embodiment of the present invention is a buoyancy groove in which the buoyancy body 112 is located in the upper region of the entire region of the foam member 114 and the buoyancy body 112 is located. The buoyancy unit 102 has a larger size than that of the buoyancy body 112 so that the liquid cargo 2 is filled in the space of the remaining buoyancy groove 114a where the buoyancy body 112 is located, so that the buoyancy unit 102 is connected to the liquid cargo 2. More so that the center of gravity of the entire buoyancy unit 102 suspended in the liquid cargo 2 is lowered, thereby effectively suppressing sloshing of the liquid cargo 2. That is, a buoyancy unit 102 having an improved sloshing suppression force against the liquid cargo 2 and a sloshing suppression apparatus including the same are provided.

In addition, in the buoyancy unit 102 according to the second embodiment of the present invention, the buoyancy groove 114a in which the buoyancy body 112 is located has a larger size than the buoyancy body 112 so that the buoyancy body 112 is located and the remaining buoyancy force. By filling the liquid cargo 2 in the space of the groove 114a, the foam member 114 can save material as much as the remaining space of the buoyancy groove 114a, thereby reducing the overall manufacturing cost of the buoyancy unit 102. do. This serves as a factor of reducing the manufacturing cost of the sloshing suppression apparatus including the plurality of buoyancy units 102.

The present invention has been described above with reference to the embodiments shown in the drawings. However, the present invention is not limited thereto, and various modifications or other embodiments falling within the scope equivalent to the present invention are possible by those skilled in the art. Accordingly, the true scope of protection of the present invention should be determined by the following claims.

1: liquid cargo storage tank 2: liquid cargo
10: sloshing suppressor 100: buoyancy unit
110: buoyancy block 112: buoyancy body
114: foam member 120: connecting belt
130: fastening member

Claims (9)

Buoyant body having buoyancy;
Foam member surrounding the buoyancy body; And
A cover surrounding the foam member,
The buoyancy unit is a buoyancy unit located in the upper region of the entire region of the foam member. The method of claim 1,
The foam member includes a buoyancy groove in which the buoyancy body is located. The method of claim 2,
The buoyancy groove is a buoyancy unit having the same size as the buoyancy body. The method of claim 2,
The buoyancy groove is a buoyancy unit having a larger size than the buoyancy body. A buoyancy unit according to any one of claims 1 to 4 disposed adjacent to each other; And
A plurality of fastening members connecting the plurality of buoyancy units to each other
Sloshing suppression apparatus comprising a. The method of claim 5,
The buoyancy unit,
And a plurality of connecting belts installed on the cover and connected to the fastening members. The method according to claim 6,
Sloshing inhibiting device is formed at both ends of the connecting belt is a connecting ring. The method of claim 7, wherein
The fastening member includes a pair of unit fastening members each having a curved shape such that both ends of the plurality of connection belts are inserted into adjacent pairs of the connection rings of adjacent connection belts, respectively. 9. The method of claim 8,
The pair of unit fastening members are disposed so that their respective ends are opposed to each other is fastened to each other by a bolt.

Images