KR102438162B1 - Double shell tanks for ships and ships - Google Patents

Abstract

A double-shell tank for ships includes an inner tank including an inner tank body for storing liquefied gas and an inner tank dome protruding upward from the inner tank body, and an outer tank body and inner tank dome surrounding the inner tank body. an outer tank comprising an outer tank dome surrounding the outer tank; Each of the support mechanisms includes: a first support member fixed to one of the inner tank and the outer tank, the first support member having a first support surface parallel to a reference plane including a central axis of the inner tank dome; a second support member fixed to the other of the inner tank and the outer tank, the second support member having a second support surface facing the first support surface; a heat insulating member fixed to the second support surface and sliding along the first support surface, interposed between the first support surface and the second support surface; Including, a side fixed to the inner tank among the first support member and the second support member is located on the reference plane.

Description

Double shell tanks for ships and ships

The present invention relates to a double-shell tank for ships mounted on a ship, and a ship including the double-shell tank for ships.

For example, a double-shell tank for liquefied gas is mounted on ships, such as a liquefied gas carrier. In this double shell tank for ships, a heat insulation layer (for example, a vacuum heat insulation layer) is formed between an inner tank and an outer tank (for example, refer patent document 1).

More specifically, the inner tank includes an inner tank body portion for storing liquefied gas, and an inner tank dome protruding upwardly from the inner tank body portion, and the outer tank includes an outer side surrounding the inner tank body portion. It includes a tank body portion and an outer tank dome surrounding the inner tank dome. The inner tank dome is for consolidating the pipe passing through the inner tank, and the pipe is disposed so as to pass through the inner tank dome and the outer tank dome.

JP 2015-004383 A

However, in a double-shell tank for ships, it is preferable to restrict the relative positions of the inner tank dome and the outer tank dome in the radial direction of the inner tank dome (hereinafter referred to as 'relative position between domes'). This is because, if the relative position between the domes is not constrained, the inner tank is displaced relative to the outer tank by the inertial force when the ship is agitated, and cyclic stress is applied to the pipe passing through the inner tank dome and the outer tank dome. In addition, when liquefied gas is injected into the inner tank, the entire inner tank becomes low temperature and the inner tank dome thermally shrinks in the axial and radial directions. Needs to be.

Therefore, an object of the present invention is to provide a double-shell tank for ships capable of constraining a relative position between domes while allowing thermal contraction of the inner tank dome, and a ship including the double-shell tank for ships.

In order to solve the above problems, the double-shell tank for ships of the present invention, an inner tank including an inner tank body portion and an inner tank dome protruding upward from the inner tank body portion for storing liquefied gas, and the inner tank an outer tank comprising an outer tank body portion surrounding the body portion and an outer tank dome surrounding the inner tank dome, and at least three supporting mechanisms disposed on the perimeter of the inner tank dome between the inner tank and the outer tank equipped with; Each of the support mechanisms includes: a first support member fixed to one of the inner tank and the outer tank, the first support member having a first support surface parallel to a reference plane including a central axis of the inner tank dome; a second support member fixed to the other of the inner tank and the outer tank and having a second support surface facing the first support surface; a heat insulating member interposed between the first support surface and the second support surface, the heat insulating member being fixed to the second support surface and sliding along the first support surface; and a side of the first support member and the second support member fixed to the inner tank is positioned on the reference plane.

According to the above configuration, at least three supporting mechanisms are arranged around the inner tank dome, and since the heat insulating member included in each supporting mechanism is movable in a direction parallel to the reference plane including the central axis of the inner tank dome, the inner tank dome The relative position between the domes can be constrained while allowing thermal shrinkage in the axial and radial directions of

The first support member may have a plate shape with the first support surface as one surface, and the second support member may have a plate shape with the second support surface as one surface. According to this structure, a 1st support member and a 2nd support member can be manufactured at low cost.

The first support member may be fixed to the outer tank dome or the outer tank body portion, and the second support member may be fixed to the outer tank dome or the inner tank body portion. According to this structure, since the 1st support surface is maintained substantially at room temperature, the sliding motion performance between a heat insulating member and a 1st support surface can be designed in a room temperature state.

The heat insulating member may have a tubular shape extending in a direction orthogonal to the reference plane. According to this structure, heat penetration into the inner tank from the outside of the outer tank through the heat insulating member can be suppressed.

Each of the support mechanisms includes a first holding member and a second holding member for holding and holding one end and the other end of the tubular heat insulating member, respectively, and the tubular heat insulating member is provided through the first holding member. It may be in contact with a 1st support surface, and may be fixed to the said 2nd support surface via the said 2nd holding member. According to this structure, one end of a simple shape tubular heat insulating member can be easily fixed to a 2nd support surface using a 2nd holding member. Further, since the first holding member holding the other end of the tubular heat insulating member can be brought into contact with the first supporting surface over a large area, the tubular heat insulating member can be smoothly slid together with the first holding member. .

A lubrication liner may be sandwiched between the first holding member and the first support surface. According to this configuration, good sliding motion can be obtained with a simple and easy configuration.

The said heat insulating member may consist of glass fiber reinforced plastics. According to this structure, heat intrusion through a heat insulating member can be suppressed further.

The second support member has a plate shape with the second support surface as one surface and the other surface, and a pair of the first support members are provided and are disposed on both sides of the second support member. good night. According to this configuration, the inner tank dome can be constrained in the circumferential direction by each supporting mechanism alone.

Each of the support mechanisms may include the first support member and the second support member one by one, and the positional relationship between the first support member and the second support member may be reversed between the adjacent support mechanisms. According to this structure, while restraining the relative position between the domes, while restraining the inner tank dome in the circumferential direction, each support mechanism can be made into a simple structure, and position adjustment between support mechanisms becomes easy.

Each of the support mechanisms includes the first support member and the second support member one by one, the number of the support mechanisms is four or more, and at least four sets of the adjacent support mechanisms are the first The positional relationship between the supporting member and the second supporting member may be reversed. This configuration also restricts the relative position between the domes, and while constraining the inner tank dome in the circumferential direction, it is possible to make each supporting mechanism a simple structure.

A space between the inner tank and the outer tank may be a vacuum space. According to this structure, the liquefied gas can be maintained at low temperature over a long period of time.

The inner tank body portion has a cylindrical shape extending in a horizontal direction, and the four supporting mechanisms are disposed between the inner tank dome and the outer tank dome in an axial direction of the inner tank body portion from a central axis of the inner tank dome. It may be arranged at an angle of 45 degrees to each other. According to this configuration, since the distances from the inner tank main body to all the supporting mechanisms are equal, the load acting on all the supporting mechanisms can be equalized.

Moreover, the ship of this invention is provided with the said double-shell tank for ships, It is characterized by the above-mentioned.

According to the present invention, it is possible to constrain the relative position between the domes while allowing thermal contraction of the inner tank dome.

1 is a longitudinal sectional view of a double-shell tank for ships according to a first embodiment of the present invention.
Fig. 2 is an enlarged cross-sectional view of the main part of Fig. 1;
Fig. 3 is a cross-sectional view schematically showing the support mechanism taken along the line III-III in Fig. 2 .
4 is a cross-sectional view of one support mechanism;
5A and 5B are longitudinal cross-sectional views taken along lines VA-VA and VB-VB of FIG. 4, respectively.
6 is a cross-sectional view schematically showing a support mechanism in a modified example of the first embodiment.
It is a cross-sectional view which shows typically the support mechanism in the double shell tank for ships which concerns on 2nd Embodiment of this invention.
It is a cross-sectional view which shows typically the support mechanism in the double shell tank for ships which concerns on 3rd Embodiment of this invention.

(First embodiment)

In FIG. 1, 2A of double shell tanks for ships mounted on ships 1, such as a liquefied gas carrier which concerns on 1st Embodiment of this invention are shown.

Specifically, the double shell tank 2A includes an inner tank 3 and an outer tank 4 surrounding the space 20 around the inner tank 3 . In this embodiment, the space 20 between the inner tank 3 and the outer tank 4 is a vacuum space. However, the space 20 between the inner tank 3 and the outer tank 4 may be filled with a gas having low thermal conductivity, such as argon gas.

The inner tank 3 includes an inner tank body portion 31 for storing liquefied gas, and an inner tank dome 32 protruding upwardly from the inner tank body portion 31 . In this embodiment, the axial direction of the inner tank dome 32 is parallel to the vertical direction, but the axial direction of the inner tank dome 32 may be slightly inclined with respect to the vertical direction. In addition, in this embodiment, the inner tank dome 32 is provided with the manhole 30 for inner tank inside inspection. However, the manhole 30 may be provided in the inner tank body 31 .

In the present embodiment, the inner tank body 31 has a cylindrical shape extending in the horizontal direction. However, the inner tank main body 31 may have a spherical shape or a rectangular shape, for example. More specifically, the inner tank body 31 includes a body extending in the transverse direction with a constant cross-sectional shape, and a hemispherical closing section that closes the openings on both sides of the body. However, the closure part may be a plane perpendicular|vertical to a trunk|drum, and a dish shape may be sufficient as it.

The liquefied gas stored in the inner tank body 31 is, for example, liquefied petroleum gas (LPG, about -45 ° C.), liquefied ethylene gas (LEG, about -100 ° C.), liquefied natural gas (LNG, about - 160° C.), liquid hydrogen (LH ₂ , about -250° C.), and liquid helium (LHe, about -270° C.).

The outer tank 4 includes an outer tank body 41 surrounding the inner tank body 31 and an outer tank dome 42 surrounding the inner tank dome 32 . That is, the outer tank body 41 has a shape in which the inner tank body 31 is enlarged, and the outer tank dome 42 has a shape in which the inner tank dome 32 is enlarged. However, the shape of the outer tank dome 42 may be slightly different from the shape of the inner tank dome 32 . In the outer tank dome 42 , a manhole 40 is provided at a position corresponding to the inner tank dome 32 .

A pair of external pedestals 12 spaced apart from each other in the axial direction of the outer tank body 41 are provided in the ship bottom 11 , and the outer tank body 41 is supported by the external pedestal 12 . has been On the other hand, between the inner tank body 31 and the outer tank body 41 , a pair of inner pedestals 21 are arranged at positions corresponding to the outer pedestals 12 . The inner pedestal 21 supports the inner tank body 31 slidably in the axial direction. This is to respond to axial heat shrinkage of the inner tank body 31 when liquefied gas is injected into the inner tank 3 .

In the double shell tank 2A, various pipes 13 such as liquefied gas pipes and electric pipes are provided so as to penetrate the inner tank dome 32 and the outer tank dome 42 . In addition, in FIG. 1, only one pipe is drawn as a representative.

Next, with reference to FIGS. 2 and 3 , the inner tank dome 32 and the outer tank dome 42 will be described in detail.

In this embodiment, the cross-sectional shapes of the inner tank dome 32 and the outer tank dome 42 are circular. However, the cross-sectional shapes of the inner tank dome 32 and the outer tank dome 42 may be, for example, elliptical. In addition, in this embodiment, although the central axis 36 of the inner tank dome 32 and the central axis of the outer tank dome 42 coincide, they may shift.

The inner tank dome 32 has a circumferential wall 33 extending upwardly from the inner tank body 31 and a dish-shaped ceiling wall 34 bulging upward from the upper end of the circumferential wall 33 . have Similarly, the outer tank dome 42 has a circumferential wall 43 extending upwardly from the outer tank body 41 and a dish-shaped ceiling wall 44 bulging upward from the upper end of the circumferential wall 43 . ) has The ceiling walls 34 and 44 may have other shapes, such as a hemispherical shape or a flat plate shape, for example. The above-mentioned manholes 30 and 40 are provided in the ceiling walls 34 and 44, respectively.

In the present embodiment, a bellows tube 45 is included in the peripheral wall 43 of the outer tank dome 42, and the peripheral wall 43 is formed by a base portion 43A and a tip portion ( 43B). The above-described pipe 13 passes through the peripheral wall 33 of the inner tank dome 32 and the tip end 43B of the peripheral wall 43 of the outer tank dome 42 . However, the pipe 13 may penetrate the ceiling wall 34 of the inner tank dome 32 and the ceiling wall 44 of the outer tank dome 42 . Alternatively, the pipe 13 is bent between the inner tank dome 32 and the outer tank dome 42 , so that the circumferential wall 33 of the inner tank dome 32 and the ceiling wall 44 of the outer tank dome 42 are ) or may penetrate through the ceiling wall 34 of the inner tank dome 32 and the peripheral wall 43 of the outer tank dome 42 .

A first annular plate 22 is fixed to the inner peripheral surface of the tip portion 43B of the peripheral wall 43 of the outer tank dome 42 . On the other hand, on the outer peripheral surface of the circumferential wall 43 of the inner tank dome 32 , a second annular plate 23 facing the first annular plate 22 is fixed. In the example shown in the figure, although the second annular plate 23 is positioned below the first annular plate 22 , the second annular plate 23 is positioned above the first annular plate 22 . good night. And the first annular plate 22 and the second annular plate 23 are connected to each other by a plurality of connecting members 25 . Each connecting member 25 may have a column shape or a block shape. For this reason, when liquefied gas is injected into the inner tank 3 and the inner tank main body 31 is thermally contracted, and the inner tank dome 32 moves downward, the bellows tube 45 is briefly contracted and contracted to the outside. The upper part of the tank dome 42 also moves downward with the inner tank dome 32 .

Between the first annular plate 22 and the second annular plate 23, in the outer tank dome 42, a tubular blocking member 24 dividing the space 20 into a lower region and an upper region is provided. is placed. This blocking member 24 is for reducing the volume opened to the atmosphere when the manhole 40 is opened. However, the arrangement of the blocking member 24 is not limited to this. For example, on the ceiling wall 34 of the inner tank dome 32 and the ceiling wall 44 of the outer tank dome 42, a tubular projection is formed to form a double tube surrounding the manholes 30 and 40. They may be provided respectively, and the blocking member 24, which is an annular plate, may be disposed between the projections. Further, instead of the first annular plate 22, a plurality of first protruding pieces having dots in the circumferential direction are provided, while instead of the second annular plate 23, a plurality of first protruding pieces facing the first protruding pieces are provided. 2 A protruding piece may be provided.

Furthermore, between the peripheral wall 33 of the inner tank dome 32 and the root portion 43A of the peripheral wall 43 of the outer tank dome 42 , at least three supports around the inner tank dome 32 are provided. An instrument 5 is arranged. This support mechanism 5 is for constraining the relative position between the domes (the relative position of the inner tank dome 32 and the outer tank dome 42 in the radial direction of the inner tank dome 32). In this embodiment, four support mechanisms 5 are provided. The support mechanism 5 is disposed at an angle of 45 degrees from the central axis 36 of the inner tank dome 32 to the axial direction D of the inner tank body 31 . However, the angular space|interval of the support mechanism 5 does not necessarily need to be uniform, and may be non-uniform.

In the present embodiment, each supporting mechanism 5 includes a pair of first supporting members 6 fixed to the outer tank dome 42 , and one second supporting member fixed to the inner tank dome 32 . 7) is included. The second support member 7 is mounted on a reference plane 50 including the central axis 36 of the inner tank dome 32 (that is, a surface defined in the axial and radial directions of the inner tank dome 32 ). positioned, the first support member 6 being arranged on either side of the second support member 7 .

Each of the first supporting members 6 has a first supporting surface 61 parallel to the reference plane 50 on the second supporting member 7 side. The second support member 7 has a pair of second support surfaces 71 facing the first support surface 61 . In this embodiment, each 1st support member 6 has the plate shape which makes the 1st support surface 61 one side, and the 2nd support member 7 has the 2nd support surface 71 on one side. It has a plate shape with one surface and the other surface. However, each of the first supporting members 6 is not necessarily a plate, and may have any shape as long as it has the first supporting surface 61 . However, if the 1st support member 6 and the 2nd support member 7 are plates, they can be manufactured at low cost.

The second supporting member 7 projects radially outward from the inner tank dome 32 circumferential wall 33 . That is, the second support surface 71 is parallel to the reference surface 50 . In a position where the support mechanism 5 is present, a doubling plate 35 is joined to the peripheral wall 33 of the inner tank dome 32 , and the second support member 7 is a doubling plate 35 . It is fixed to the peripheral wall 33 through the. However, the doubling plate 35 may be omitted and the second support member 7 may be directly fixed to the peripheral wall 33 . On the other hand, each of the first supporting members 6 is fixed to the base portion 43A of the circumferential wall 43 of the outer tank dome 42 , from the base 43A to the circumferential wall of the inner tank dome 32 . It protrudes parallel to the 2nd support member 7 toward (33).

More specifically, as shown in FIGS. 4 and 5B , at the tip of the surface (outer surface) opposite to the first support surface 61 of each first support member 6, the inner tank dome 32 is A reinforcing plate 62 extending in the axial direction is vertically joined to the first supporting surface 61 , and between the reinforcing plate 62 and the base portion 43A, the outer surface of the first supporting member 6 is formed. Ribs 63 connected to the upper end and lower end are provided.

On the other hand, as shown in FIGS. 4 and 5A , a reinforcing plate 72 extending in the axial direction of the inner tank dome 32 is provided at the tip of each second supporting surface 71 of the second supporting member 7 . It is vertically joined to the second support surface 71 , and between the reinforcing plate 72 and the doubling plate 35 , a rib 73 connected to the upper end and the lower end of the second support surface 71 is provided. .

A heat insulating member 55 is interposed between the first support surface 61 and each of the second support surfaces 71 . In the present embodiment, the heat insulating member 55 has a tubular shape extending in a direction orthogonal to the reference plane 50 . In addition, the axial direction of the heat insulating member 55 does not necessarily need to be parallel to the direction orthogonal to the reference plane 50, and may be inclined slightly with respect to the direction orthogonal to the reference plane. The cross-sectional shape of the tubular heat insulating member 55 may be circular or polygonal may be sufficient as it.

In this embodiment, the tubular heat insulating member 55 consists of glass fiber reinforced plastics (GFRP). However, the material constituting the tubular heat insulating member 55 may be carbon fiber reinforced plastic (CFRP) or other FRP (eg, cloth reinforced phenolic resin), or may be metal.

One end and the other end of the tubular heat insulating member 55 are respectively held and held by the 1st holding member 8A and the 2nd holding member 8B. And the heat insulating member 55 is in contact with the 1st support surface 61 via the 1st holding member 8A, and is being fixed to the 2nd support surface 71 via the 2nd holding member 8B. And the heat insulating member 55 slides along the 1st support surface 61 together with the 1st holding member 8A. 3 is a view schematically showing the support mechanism 5, and the sliding motion of the heat insulating member 55 along the first support surface 61 is expressed by a gap therebetween ( FIG. 3 ). In , the ribs 63 and 73 are indicated by dashed-dotted lines, while the holding members 8A and 8B are omitted).

In addition, when liquefied gas is injected into the inner tank 3, the second supporting member 7, the second holding member 8B, and the heat insulating member 55 become low temperature and thermally contract, and the first holding member 8A ) and a gap may be formed between the first support surface 61 . That is, the 'sliding motion' means not only the relative movement in a state in which two objects are physically in contact, but also the relative movement in a non-contact state.

In this embodiment, each of the first holding member 8A and the second holding member 8B has a shape in which a tubular heat insulating member 55 is inserted therein. Specifically, each holding member includes a tubular portion 82 fitted with the tubular heat insulating member 55 , and a bottom portion 81 that abuts against the end face of the tubular heat insulating member 55 . In this embodiment, although an opening is formed in the center of the bottom part 81, the opening may not be formed. The cylindrical portion 82 is coupled to the heat insulating member 55 by a pin 56 . However, each holding member may have a shape in which the holding member is inserted into the tubular heat insulating member 55 . Further, each holding member and the heat insulating member 55 may be coupled with screws, rivets, or the like.

A lubrication liner 51 is sandwiched between the first holding member 8A and the first support surface 61 . The thickness of the lubrication liner 51 is not particularly limited, and the lubrication liner 51 may be thin or thick. The lubrication liner 51 is fixed to the first support surface 61 by means of, for example, screws. However, the lubrication liner 51 may be fixed to the 1st holding member 8A. The lubricating liner 51 is made of a material having good sliding motion (for example, fluororesin, molybdenum disulfide).

As explained above, in 2A of double shell tanks for ships of this embodiment, the at least three support mechanisms 5 are arrange|positioned around the inner tank dome 32, and the heat insulation member contained in each support mechanism 5. Since the 55 is movable in a direction parallel to the reference plane 50 , the relative position between the domes (the radial direction of the inner tank dome 32 ) while allowing thermal contraction in the axial and radial directions of the inner tank dome 32 . The relative position of the inner tank dome 32 and the outer tank dome 42 in the ) can be constrained.

Moreover, in this embodiment, since the heat insulating member 55 consists of GFRP, the heat penetration through the heat insulating member 55 can be suppressed further.

In addition, in each support mechanism 5 , since a pair of first support members 6 are disposed on both sides of the second support member 7 , each support mechanism 5 alone supports the inner tank dome 32 . It can be constrained in the circumferential direction.

In addition, since the space 20 between the inner tank 3 and the outer tank 4 is a vacuum space, it is possible to maintain the liquefied gas at a low temperature over a long period of time.

<Modified example>

Hereinafter, although a modification of 1st Embodiment is demonstrated, the following modification is applicable also as a modification of 2nd and 3rd Embodiment mentioned later except for the 2nd modification.

Assuming that the axial direction D and the width direction of the inner tank main body 31 are 'front-to-back direction' and 'left and right direction', the four supporting mechanisms 5 have the central axis 36 of the inner tank dome 32 ), you may arrange|position two in front and back, and two in right and left. However, in this case, since the upper surface of the inner tank main body 31 is straight in the front-rear direction but curved in the left-right direction, the distance from the inner tank main body 31 to the left and right support mechanisms 5 is It becomes longer than the distance from the inner tank body part 31 to the front-back support mechanism 5. On the other hand, if the layout is the same as in the above embodiment, since the distances from the inner tank body part 31 to all the support mechanisms 5 are the same, the load acting on all the support mechanisms 5 can be equalized.

Like the double shell tank 2B for ships of the modified example shown in FIG. 6 , each support mechanism 5 has one first support member 6 positioned on the reference plane 50 fixed to the inner tank dome 32 . ) and a pair of second support members 7 fixed to the outer tank dome 42 and disposed on both sides of the first support member 6 . In this case, each of the second supporting members 7 is not necessarily a plate, and may have any shape as long as it has the second supporting surface 71 . However, as in the above embodiment, if the first supporting member 6 is fixed to the outer tank 4 and the second supporting member 7 is fixed to the inner tank 3, the first supporting surface 61 is Since it is maintained at substantially room temperature, the sliding motion performance between the heat insulating member 55 and the first support surface 61 can be designed at room temperature.

The second support surface 71 of the second support member 7 is not necessarily parallel to the reference surface 50 . For example, when the edge part of the heat insulating member 55 is cut diagonally, you may incline with respect to the reference plane 50 so that the 2nd support surface 71 may follow the edge part of the heat insulation member 55. FIG. In this case, the second support member 7 positioned on the reference surface 50 may be disposed so that the reference surface 50 passes through at least a part of the second support member 7 .

The heat insulating member 55 may be a solid block. However, if the heat insulating member 55 is a tube as in the above embodiment, heat intrusion into the inner tank 3 from the outside of the outer tank 4 through the heat insulating member 55 can be suppressed. In addition, when the heat insulating member 55 is a solid block, while directly fixing the heat insulating member 55 to the 2nd support surface 71, even if it slides directly with respect to the 1st support surface 61, good night.

When flanges are formed at both ends of the tubular heat insulating member 55 , the heat insulating member 55 is directly fixed to the second support surface 71 and directly to the first support surface 61 . It is possible to make a sliding motion. However, if it is the same structure as the said embodiment, using the 2nd holding member 8B, one end of the simple tubular heat insulating member 55 can be easily fixed to the 2nd support surface 71. As shown in FIG. Further, since the first holding member 8A for holding and holding the other end of the tubular heat insulating member 55 can be brought into contact with the first supporting surface 61 over a large area, the tubular heat insulating member 55 can be It can slide smoothly together with the 1st holding member 8A.

The lubrication liner 51 is not necessarily interposed between the first holding member 8A and the first supporting surface 61 . For example, it is also possible to comprise the 1st holding member 8A with resin with favorable sliding motion. Alternatively, even when the first holding member 8A is made of metal, a lubricant may be applied on the first supporting surface 61 to which the first holding member 8A is in contact. However, if the lubricating liner 51 is sandwiched between the first holding member 8A and the first supporting surface 61 as in the above embodiment, good sliding performance can be obtained with a simple and easy configuration.

The support mechanism 5 may be disposed between the peripheral wall 33 of the inner tank dome 32 and the tip end 43B of the peripheral wall 43 of the outer tank dome 42 . In this case, the heat insulating member 55 may slide only in the direction orthogonal to the central axis 36 of the inner tank dome 32 .

The peripheral wall 43 of the outer tank dome 42 does not necessarily contain the bellows tube 45 . In this case, the movement of the inner tank dome 32 in the axial direction when liquefied gas is injected into the inner tank 3 and the inner tank main body 31 is thermally contracted is allowed by the bending of the pipe 13 . do.

(Second embodiment)

Next, with reference to FIG. 7, the double shell tank 2C for ships which concerns on 2nd Embodiment of this invention is demonstrated. In addition, in this embodiment and 3rd Embodiment mentioned later, the same code|symbol is attached|subjected to the same component as 1st Embodiment, and the overlapping description is abbreviate|omitted.

In the present embodiment, each supporting mechanism 5 includes one first supporting member 6 fixed to the outer tank dome 42 and a pair of second supporting members fixed to the inner tank dome 32 . 7) is included. A pair of second support members 7 are disposed on both sides of the first support member 6 , and are positioned on a reference plane 50 including a central axis 36 of the inner tank dome 32 . . Each second supporting member 7 is a plate projecting radially outward from the peripheral wall 33 of the inner tank dome 32 , and has a second supporting surface 71 parallel to the reference plane 50 . . On the other hand, the first support member 6 has a trapezoidal shape when viewed from the axial direction of the inner tank dome 32 , and has a pair of first support surfaces 61 parallel to the reference plane 50 . . The point where the tubular heat insulating member 55 is in contact with the 1st support surface 61 via the 1st holding member 8A, and is fixed to the 2nd support surface 71 via the 2nd holding member 8B. is the same as in the first embodiment.

Also in this embodiment, the same effect as that of the first embodiment can be obtained.

In addition, although not illustrated, each support mechanism 5 includes a pair of first support members 6 fixed to the inner tank dome 32 and positioned on the reference plane 50 , and the outer tank dome 42 . ) and one second support member 7 (approximately trapezoidal shape when viewed from the axial direction of the inner tank dome 32) disposed between the first support members 6 . In this case, each of the first supporting members 6 is not necessarily a plate, and may have any shape as long as it has the first supporting surface 61 . However, as in the above embodiment, if the first support member 6 is fixed to the outer tank 4 and the second support member 7 is fixed to the inner tank 3, the first support surface 61 Since is maintained at substantially room temperature, the sliding motion performance between the heat insulating member 55 and the first support surface 61 can be designed at room temperature.

(Third embodiment)

Next, with reference to FIG. 8, the double shell tank 2D for ships which concerns on 3rd Embodiment of this invention is demonstrated.

In the present embodiment, each support mechanism 5 is positioned on a reference plane 50 , with one first support member 6 fixed to the outer tank dome 42 , and fixed to the inner tank dome 32 . and one second support member (7). For this reason, the support mechanisms 5 are reversed as if reflected in a mirror alternately. In other words, the positional relationship of the 1st support member 6 and the 2nd support member 7 with respect to the adjacent support mechanisms 5 is reversed. The point where the tubular heat insulating member 55 is in contact with the 1st support surface 61 via the 1st holding member 8A, and is fixed to the 2nd support surface 71 via the 2nd holding member 8B. is the same as in the first embodiment. In addition, the 1st support member 6 does not necessarily need to be a plate, and any shape may be sufficient as long as it has the 1st support surface 61 . Similarly, the second support member 7 is not necessarily a plate, and may have any shape as long as it has the second support surface 71 .

Also in this embodiment, the same effect as that of the first embodiment can be obtained. Moreover, in this embodiment, each support mechanism 5 can be made into a simple structure while restraining the relative position between domes and restraining the inner tank dome 32 in the circumferential direction, and the support mechanism 5 ), making it easier to adjust the position between In addition, in this embodiment, in order to ensure symmetry, it is preferable that the number of the support mechanisms 5 is an even number. If the number of support mechanisms 5 is an even number, then all neighboring support mechanisms 5 are first The positional relationship between the supporting member 6 and the second supporting member 7 is reversed. On the other hand, if the number of support mechanisms 5 is odd, the adjacent support mechanisms 5 except for one set of adjacent support mechanisms 5 (for example, if the number of support mechanisms 5 is five, 4 A set of adjacent supporting mechanisms 5) The first supporting member 6 and the second supporting member 7 have the opposite positional relationship.

In addition, although not shown, each support mechanism 5 includes one first support member 6 fixed to the inner tank dome 32 and positioned on the reference plane 50 , and the outer tank dome 42 . It may include one second support member 7 fixed to the . However, as in the above embodiment, if the first support member 6 is fixed to the outer tank 4 and the second support member 7 is fixed to the inner tank 3, the first support surface 61 Since this is maintained at substantially room temperature, the sliding motion performance between the heat insulating member 55 and the first support surface 61 can be designed at room temperature.

In addition, the support mechanism 5 does not necessarily need to be reversed as if reflected in a mirror alternately. For example, when the number of support mechanisms 5 is four or more, the positional relationship between the first support member 6 and the second support member 7 is reversed between at least four sets of the adjacent support mechanisms 5 . If this is the case, each supporting mechanism 5 can have a simple structure while constraining the relative position between the domes and constraining the inner tank dome 32 in the circumferential direction. For example, when the number of support mechanisms 5 is 6 and the support mechanisms 5 are classified into A and B according to the difference in directions, in the circumferential direction, A1 → A2 → B1 → A3 → B2 → B3 → ( You may line up with A1). In this case, the positional relationship between the four sets of adjacent support mechanisms 5 (A2 and B1, B1 and A3, A3 and B2, B3 and A1), and the first support member 6 and the second support member 7 . is the opposite

(Other embodiments)

The present invention is not limited to the first to third embodiments described above, and various modifications are possible without departing from the gist of the present invention.

For example, the support mechanism 5 is not necessarily disposed between the inner tank dome 32 and the outer tank dome 42 , but between the inner tank body part 31 and the outer tank body part 41 . may be placed in That is, the first support member 6 is fixed to one of the inner tank body part 31 and the outer tank body part 41 , and the second support member 7 is fixed to the inner tank body part 31 and the outer tank body part 31 . You may be fixed to the other one of the parts 41. In this case, the side fixed to the inner tank body part 31 among the first support member 6 and the second support member 7 is located on the reference plane 50 .

In addition, all the support mechanisms 5 do not necessarily need to be arrange|positioned at the same height position, and may be arrange|positioned so that it may shift|shift up and down alternately, for example.

1: ship
2A ~ 2D : Double shell tank for ships
3: inner tank
31: inner tank body part
32: inner tank dome
36: central axis
4: outer tank
41: outer tank body part
42: outer tank dome
5: support mechanism
50: reference plane
51: lubrication liner
55: insulation member
6: first support member
61: first support surface
7: second support member
71: second support surface
8A: first holding member
8B: second holding member

Claims (13)

An inner tank including an inner tank body for storing liquefied gas and an inner tank dome protruding upward from the inner tank body,
an outer tank comprising an outer tank body portion surrounding the inner tank body portion and an outer tank dome surrounding the inner tank dome;
at least three support mechanisms disposed around the inner tank dome between the inner tank and the outer tank;
Each of the support mechanisms is
a first support member fixed to one of the inner tank and the outer tank and having a first support surface parallel to a reference plane including a central axis of the inner tank dome;
a second support member fixed to the other of the inner tank and the outer tank and having a second support surface facing the first support surface;
a heat insulating member interposed between the first supporting surface and the second supporting surface, fixed to the second supporting surface, and sliding along the first supporting surface;
A side of the first supporting member and the second supporting member that is fixed to the inner tank is located on the reference plane. According to claim 1,
The first support member has a plate shape with the first support surface as one surface,
The said 2nd support member is a plate shape which uses the said 2nd support surface as one surface, The double-shell tank for ships characterized by the above-mentioned. 3. The method of claim 1 or 2,
The first support member is fixed to the outer tank dome or the outer tank body,
The second supporting member is fixed to the inner tank dome or the inner tank main body. 3. The method of claim 1 or 2,
The heat insulating member is a double-shell tank for ships, characterized in that the tubular shape extending in a direction orthogonal to the reference plane. 5. The method of claim 4,
Each of the support mechanisms includes a first holding member and a second holding member for holding and holding one end and the other end of the tubular heat insulating member, respectively,
The tubular heat insulating member is in contact with the first support surface through the first holding member, and is fixed to the second support surface through the second holding member. 6. The method of claim 5,
A double-shell tank for ships, characterized in that the lubrication liner is sandwiched between the first holding member and the first support surface. 3. The method of claim 1 or 2,
The heat insulating member is a double-shell tank for ships, characterized in that made of glass fiber reinforced plastic. 3. The method of claim 1 or 2,
The second support member has a plate shape with the second support surface as one surface and the other surface,
The first supporting member is provided as a pair, and is disposed on both sides of the second supporting member. 3. The method of claim 1 or 2,
Each of the support mechanisms includes one of the first support member and the second support member,
The double-shell tank for ships characterized in that the positional relationship of the said 1st support member and the said 2nd support member is reversed between the said support mechanisms adjacent to each other. 3. The method of claim 1 or 2,
Each of the support mechanisms includes one of the first support member and the second support member,
The number of the support mechanisms is four or more, and the positional relationship of the said 1st support member and the said 2nd support member is reversed between at least four sets of the said support mechanisms, The double-shell tank for ships characterized by the above-mentioned. 3. The method of claim 1 or 2,
A double-shell tank for ships, characterized in that the space between the inner tank and the outer tank is a vacuum space. 3. The method of claim 1 or 2,
The inner tank body portion has a cylindrical shape extending in the horizontal direction,
Four of the supporting mechanisms are disposed between the inner tank dome and the outer tank dome at a 45 degree angle from the central axis of the inner tank dome to the axial direction of the inner tank body. each tank. A ship provided with the double shell tank for ships of Claim 1 or 2.

Images