JPS6020640B2 - Ship-mounted cryogenic liquid transport tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tank for transporting cryogenic liquids, and more particularly to a tank for transporting cryogenic liquids that is intended to be mounted on a ship.

A cryogenic liquid transport tank used in a conventional road vehicle or railway tank is, for example, as shown in FIG. Heavy-shell structure It consists of a vacuum insulated tank structure, and generally the inner shell 2 is vertically movably supported in the end wall of the outer shell by a pair of upper and lower pin-shaped support members at one end surface, and the outer shell The axial contraction of the inner shell caused by the emptying and filling of the cryogenic liquid is compensated for at one end by the fixed bearing member disposed in the lateral support base, and at the other fixed end. Keeping the distance between the outer shell and the inner shell constant, the low-temperature liquid is loaded and unloaded at this end and other nozzles 13 are passed through the outer shell to separate the inside of the inner shell and the outside of the outer shell. It is set up so that you can suit your needs.

However, when a tank with this structure is mounted on a ship as is, it is necessary to provide the necessary space in the longitudinal direction of the ship's structure, taking into consideration the direction of the tank nozzle and the piping that connects to it. The disadvantage is that it is large. The object of the present invention is to provide a low temperature liquid transport tank for ships that eliminates the above-mentioned drawbacks. The present invention is characterized by a double-shell tank that is supported by a lateral restraint mechanism, a longitudinal restraint mechanism, and a suspension mechanism for the outer shell.According to the present invention, the ship can be made smaller and ``Because the low-temperature liquid delivery/input nozzle is located above, the conventional liquid handling system for ships can be used as is, and other effects can be achieved.

Next, embodiments of the present invention will be described with reference to the drawings.

The tank consists of a horizontal pillow-shaped double shell tank consisting of an outer shell 1 and an inner shell 2, which face each other with a gap perpendicular to the outside of the inner shell 2 at both ends of the tank, as shown in Figures 1 to 3. The guide plate 4, which is made up of two parallel planes, is installed with a bracket 6 so that the centers of these two planes are on a vertical plane passing through the center of the tank.
This guide plate 4 is a guide member loosely fitted between the guide plates so as to be slidable in parallel in the longitudinal direction and in the vertical direction.
For example, the center plate 31 is attached to the inside of the outer shell via the heat insulating material 11 to constitute a foundation direction restraining mechanism. Furthermore, as shown in Figure 4 of Base 9, the outer shell and inner shell, excluding the nozzle mounting part, should be parallel to the vertical plane perpendicular to the longitudinal direction of the nozzle mounting position, and the center thereof should be on the vertical plane. In the same way as described above, one or more guide plates 42, a holding member consisting of the heat insulating material 112 to the bracket 82, and a guide member such as the center plate 3 are inserted into the gap between the shells.
2. Attach the bracket 63 to form a longitudinal restraint mechanism that is slidable laterally and vertically.

Further, as shown in FIGS. 5 and 6, a plurality of wire ropes 7 are placed at arbitrary positions on both sides of the inner shell 2 with a gap between them in the longitudinal direction, and one end of each is connected to a bracket 64. Freely supported and installed by the support end 5 via the rope fixing plate YQ attached to the inner shell,
A groove wheel 8 (see Fig. 7) of a wire rope support camphor 9 movable in the longitudinal direction of the feeder 18 (see Fig. 7) is provided on the inner wall of the outer shell above this mounting position via a heat insulating material 113 and a bracket 65. ), and the other end is connected to the supporting end 52 which is movable in the longitudinal direction through the insulating material 114 and the bracket 66.
A tension mechanism is used to ensure that a part of the wire rope, which is freely supported on another part of the inner wall of the outer shell and is in a vertical plane perpendicular to the longitudinal direction of the tank, always comes into contact with the outer surface of the inner shell. A certain turnbuckle]4 forms a suspension mechanism by being tensioned. The inner shell 2 is supported within the outer shell 1 by the above-described lateral restraint mechanism, longitudinal restraint mechanism, and suspension mechanism to form a double-shell tank, and the gap between the inner shell and the outer shell is A heat-insulating cold-insulating layer 2 made of jute or the like is provided, and this gap is kept in a vacuum to form a vacuum-insulated double shell tank. In addition, when this tank is installed on a ship, if the pitching or rolling of the ship generates a force that causes the inner shell to move upward relative to the outer shell due to vertical force, please refer to Figure 1 and As shown in Fig. 5 and Fig. 6, a plurality of springs 15 are installed in the gap between the outer shell and the inner shell at the top of the tank.
are inserted through the heat insulating materials 115, 116 and a slide plate (not shown). The groove wheel 8 of the support rod 9 is mounted on a shaft 18 parallel to the longitudinal direction of the tank via a pole bearing 17 so as to be rotatable and freely movable in the longitudinal direction. Next, the effects will be explained.

Filling a tank with cryogenic liquid creates a relative displacement between the outer shell and inner shell of the tank. This displacement occurs not only in the longitudinal direction but also in the radial direction. Expansion and contraction in the longitudinal direction is compensated for by displacing the longitudinal restraining mechanism in the directions of both ends. In this case, since the inner shell is freely supported in the longitudinal direction with respect to the outer shell by the wire rope support 9, the support end 52, and the lateral restraint mechanism provided at both ends of the tank, no trouble will occur. do not have. Of the expansion and contraction in the radial direction, expansion and contraction in the horizontal and lateral directions are compensated by displacements in both lateral directions around the lateral restraint mechanism.

In this case, since the inner shell is freely supported in the horizontal and lateral directions relative to the outer shell by a flexible wire rope and a longitudinal restraint mechanism provided on the side of the tank, no problem occurs. Of the radial expansion and contraction, the vertical expansion and contraction is determined by the ratio of linear expansion coefficients of the wire rope material and the inner shell material within the range of temperature change of the inner shell, and the arc of the arc touching the inner shell of the wire rope due to temperature change. From the amount of change in length, obtain a displacement equal to the displacement of the inner shell in the vertical distance between the horizontal plane passing through the wire rope support end 5 of the inner shell and the top of the inner shell ~ the length of the wire rope 7 is set, and the wire rope is provided so that the wire rope is always in contact with the outer wall of the inner shell so that the temperature of the inner shell is transmitted to the wire rope, so the temperature of the inner shell and the temperature of the wire rope are always approximately the same temperature. . Therefore, when the temperature of the inner shell is lowered by introducing a cryogenic liquid into the outer shell of the empty tank, the temperature of the wire to rope is also lowered. When the inner shell contracts and its radius becomes smaller, the wire rope also contracts and becomes shorter, pulling the inner shell upward by an amount equal to the amount of contraction in the vertical distance between the wire-rope attachment point and the top of the inner shell. act.
Therefore, the amount of displacement of the inner shell is compensated at the lower end, and the gap between the outer shell and the inner shell at the top is always kept constant. When the tank goes from full to empty and the temperature rises and the inner shell expands, the displacement of the inner shell is compensated at the lower end due to the opposite effect to the above, and the distance between the outer shell and the inner shell at the top is always maintained. held constant. Therefore, the nozzle penetrating portion at the top of the outer shell can be integrally fixed in an airtight manner, and an airtight structure, which is a necessary condition for a vacuum insulated tank, can be achieved. In addition, since a nozzle that penetrates the inner shell can be installed in the tank neck, it is possible to eliminate the ship's space in the longitudinal direction of the tank, which not only helps in downsizing the ship, but also reduces the The cargo handling equipment in the tank can be used as is. It should be noted that the restraint mechanisms in the lateral and longitudinal directions are not limited to those in this embodiment, and may be any mechanism as long as it has a similar effect.

Further, the wire rope 7 is not limited to this, and part or all of it may be replaced with other shapes and materials, or a combination thereof may be used. Examples of this are shown in 8th to 1st
Shown in Figure 0. That is, the middle (part) of a plurality or a single wire rope 7 may be replaced with a steel plate 19 (FIG. 8),
Further, the wire rope 7 may be hung as shown in FIGS. 9 and 10.

[Brief explanation of the drawing]

1 to 10 show an embodiment of the present invention, FIG. 1 is a partially cutaway side view of the tank, FIG. 2 is a partially cutaway plan view of FIG. 1,
Figure 3 is a view taken along the A-A arrow in Figure 1, Figure 4 is a view taken along the B-B arrow in the same figure, Figure 5 is a view taken along the C-C arrow in Figure 1 at room temperature, and Figure 6 is a view taken at a low temperature. Fig. 1 is a view taken along the line C-C in Fig. 7, Fig. 7 is a sectional view of the groove wheel attachment part of the supporting camphor, Fig. 8 is a partial view of a modified example of the wire rope, Figs. 9 and 10 are a partial view of the modified example, FIG. 11 is a partially cutaway plan view of a conventional insulated vacuum double shell tank. 1...outer shell, 2...inner shell, 3. ~2...center plate, 4,
~2... Guide plate, 5, ~2... Support machine, 6, ~
6... Bracket, 7... Wire rope, 8... Groove wheel, 9.
... Support Zen, 10... Rope fixing plate, 1 1,
~6...Insulating material, 13...Nozzle. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1. In a horizontal vacuum-insulated double-shell tank consisting of an outer shell and an inner shell, the inner shell is supported by the outer shell by a lateral restraint mechanism, a longitudinal restraint mechanism, and a suspension mechanism, and the lateral restraint mechanism is The longitudinal restraint mechanism is composed of a guide member provided at either the outer ends of the inner shell or the inner side of the outer shell, and a clamping member that clamps the guide member and restrains the lateral movement of the inner shell. The guide member includes a guide member provided on either the left or right outer side of the inner shell or the inner side of the outer shell on the lateral center line of the shell, and a clamping member that clamps the guide member and restrains movement in the longitudinal direction of the inner shell. The suspension mechanism supports one end of the wire rope on the outer shell on both sides of the inner shell, and the other end is hung around a guide wheel installed in the outer shell above this support point to suspend the wire rope. The double tank is supported by the outer surface of the inner shell between the support point and the guide wheel, and the wire rope is brought into contact with the outer surface of the inner shell, and a nozzle penetrating the inner shell is provided at the top of the double tank. A low-temperature liquid transport tank mounted on a ship, characterized by: