JPS598080Y2 - Spring suspended roof of low temperature tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved suspended roof suspension system for a cryogenic tank having a suspended roof.

As shown in FIGS. 1 and 2, the conventional suspended roof of a low-temperature tank is such that the suspended roof 2' is moved from the outer roof 3' to the surface of the low-temperature liquid 02 stored in the tank 01 using a hanging rod 1'. It was suspended to insulate the liquid storage 02.

However, in this conventional structure, as shown in FIG. 2, the hanging roof 2' is simply supported by a hanging rod 1' having a stopper at its lower end, which has the following disadvantages.

(1) When the liquid level of storage liquid 02 is shaken due to an earthquake, etc., the liquid level of storage liquid 02, which was stationary as shown in Figure 3A, rises, for example near arrow A, as shown in Figure 3B. hanging roof 2
′ is lifted once as shown by arrow a, and then, when moving downward as shown by arrow A′ as shown in FIG. .

A similar phenomenon occurs at the arrow opening shown in FIG. B and the arrow opening ' shown in FIG. C once the stored liquid 02 reaches the suspended roof 2'.

The area of the cryogenic tank is generally very large, and therefore the force that pulls the hanging roof 2' downward is also very large, and if it exceeds the limit, the hanging roof 2' will be destroyed, and the wave crest of the stored liquid 02 will reach the outer roof 3'. If it comes into contact with the living thing, it will destroy each part by creating a heat spot, and it will overflow outside and cause damage to people and property. If it touches objects, it will destroy them with a heat spot, and even if it does not touch them, it will evaporate violently in the atmosphere, lowering the partial pressure of oxygen in the air around it and suffocating human resources, or Most of them are flammable gases, so if they catch fire, they will explode and cause a fire.)

(2) In the case of a slight earthquake, even if it does not result in a disaster like the one described in (1) above, the hanging roof will be destroyed and the tank will become unusable.

The present invention aims to provide a spring suspended roof for a low temperature tank that eliminates the above-mentioned problems, and its structure is such that, in a low temperature tank having a suspended roof, a hanging rod for suspending the suspended roof is connected to the suspended roof. and a spring-suspended roof for a low-temperature tank, characterized in that the roof is connected to one or both of the outer roofs via springs, and according to the present invention, a hanging rod for suspending the suspended roof of the low-temperature tank is attached to the suspended roof. Since it is connected to either or both of the outer roof and the outer roof via springs, it has the following advantages compared to the conventional suspended roof of a low temperature tank.

(b) Even if the liquid level of the storage liquid fluctuates due to an earthquake, etc., which lifts the suspended roof and then pulls it down, the springs absorb the energy of the pulling down, so the suspended roof does not break, and the storage liquid remains at an extremely low temperature. There is no longer any concern that the water will overflow outside and cause damage to people, property, etc.

(b) Eliminates the problem of the suspended roof being destroyed by a slight earthquake, making the tank unusable.

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

4 to 6, 01 is a tank to which this embodiment is applied, 02 is a cryogenic liquid storage stored in the tank 01, and 1 is a bracket provided on a suspended roof 2 and an outer roof 3, which will be described later. 7, the upper end is stopped by a stopper 5, and the lower end is stopped by a stopper 6, and a coil spring 4 is interposed between the stopper 5 and the bracket 1-7 and between the suspended roof 2 to form a suspended roof. Hanging rod for hanging 2, 2 is liquid storage 0
2 is suspended by a hanging rod 1 close to the liquid level and serves as insulation for the liquid storage 02; 3 is a dome-shaped outer roof that serves as a lid for the tank 01; 4 is the upper end of the hanging rod 1 and the side of the outer roof 3. The suspension rod 1 is suspended in a compressed manner by being interposed between the brackets 7 of 2 is a coil spring that supports the hanging rod 1; 5 is a disc-shaped stopper fixed to the upper end of the hanging rod 1 passing upward through the bracket 7 to prevent it from falling; 6 is a disk-shaped stopper fixed to the lower end of the hanging rod 1 passing downward through the suspended roof. A disk-shaped stopper 7 fixed to prevent falling off is a bracket fixed to the lower side of the outer roof 3 to facilitate connection of the outer roof 3 and the hanging rod 1.

Next, the effects of the above embodiment will be explained.

When the liquid level of the storage liquid 02 fluctuates due to an earthquake or the like, and the suspended roof 2 is first lifted by the liquid level, the upper and lower coil springs 4, which had been compressed up to a certain amount of displacement, are released, as is clear from Fig. 5. After these free lengths are exceeded, the hanging roof 2 can freely move upward away from the coil spring 4 in the direction of arrow 8, as shown in FIG.

Next, when the liquid level (not shown) falls and the suspended roof 2 is pulled down, it is supported by the coil spring 4 again, and the lowering force is greater than the normal state by an amount corresponding to the force greater than the weight of the suspended roof 2 in the normal state. Absorbs energy deflected by.

The coil spring 4 on the outside roof 3 side also bends and absorbs energy.

Therefore, the lowering energy due to the liquid level is absorbed by the coil springs 4 and cannot destroy the suspended roof 2.

That is, the suspended roof 2 can be protected by the coil spring 4 from the force of lowering the liquid level of the liquid storage 02.

In the above embodiment, the coil springs 4 are interposed at both the upper and lower ends of the hanging rod 1. However, the coil springs 4 do not necessarily need to be used at both the upper and lower ends. For example, the upper coil spring 4 is omitted and the upper end of the hanging rod 1 is may be fixed to the outer roof 3, or conversely the lower coil spring 4 may be omitted.

Further, the type of spring is not limited to a coil spring; for example, a chevron-shaped leaf spring with a sufficient amount of deflection may be used, or an air spring enclosed in a bellows may be used.
Alternatively, a rubber body or other elastic body may of course be used.

Moreover, the method of interposing the springs is not a compression type, but as long as the strength is guaranteed, it is of course possible to use a tension type in which the springs are connected in series with hanging rods to suspend the suspended roof.

As specifically explained in the embodiment above, the present invention connects the suspension rod for suspending the suspended roof of the low temperature tank to either or both of the suspended roof and the outer roof via a spring, so that it is not possible to use the conventional low temperature tank. It has the advantages (a) and (b) explained at the beginning compared to a suspended roof.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of an embodiment of the conventional example, Fig. 2 is a detailed view of Enclosure II in Fig. 1, and Fig. 3 is a side sectional view showing the process of failure in the conventional example during an earthquake. 4 is a side sectional view of an embodiment of the present invention, and FIG. 5 is a side sectional view of an embodiment of the present invention.
6 is an explanatory diagram showing the situation in which the suspended roof is displaced due to the agitation of the stored liquid in the lower part of FIG. 5. 01...Tank, 1...Hanging rod, 2...Hanging roof,
3...Outer roof, 4...Coil spring, 5...S1~
Tsupa 6...Stonnos

Claims (1)

[Scope of utility model registration request] A spring suspended roof for a low temperature tank having a suspended roof, characterized in that a hanging rod for suspending the suspended roof is connected to either or both of the suspended roof and the outer roof via a spring.