JPH0454399Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Field of industrial application) This invention is used to store liquefied gases such as neon (Ne), deuterium, hydrogen, helium (He), etc., which have an ultra-low temperature of -200 degrees C or less in their liquefied state. This relates to ultra-low temperature containers used for.

(Prior Art) A conventional cryogenic container employs a vacuum insulation method and has a quadruple tank structure.

FIG. 3 is a partially cutaway sectional view of a cryogenic container showing one conventional example.

The ultra-low temperature container as a whole has a main body part 1 in the shape of a cylinder with a bottom that is long in the axial direction, and an opening of the main body part 1 is narrowed.
The inlet portion 2 is formed into a cylindrical shape with a small diameter.

The main body part 1 and the inlet part 2 include an outer tank 3 and a second tank 4 formed inside with a space between the outer tank 3 and the outer tank 3.
A third tank 5 is formed by providing a spacing margin inside the second tank, and an inner tank 6 is formed by providing a spacing margin inside the third tank 5.

A heat insulating layer 7 is formed on the inner surface of the outer tank 3, the inner and outer surfaces of the second tank 4, the third tank 5, and the outer surface of the inner tank 6. The space between the second tank 4 and the third tank 5 and the space between the third tank 5 and the inner tank 6 are formed in a vacuum state.

In addition, each heat insulating layer 7 is formed by alternately wrapping 30 to 40 layers of aluminum foil and glass fiber thin film-like sheets in a large container in which the container volume of the inner tank 6 exceeds 100 liters.

In addition, in a small container in which the container volume of the inner tank 6 is 100 liters or less, liquid nitrogen is sealed in the space between the second and third layers to form a heat insulating layer 7 in this area.

(Problem to be solved by the invention) In the ultra-low temperature container shown in the conventional example, in the case of a large container in which the container volume of the inner tank 6 exceeds 100 liters, the connecting part between the main body part 1 and the inlet part 2 and the main part 1 It is difficult to form a heat insulating layer 7 on the bottom part, and the inner tank 6
For small containers with a container volume of 100 liters or less,
Since liquid nitrogen is used, the production and maintenance costs of ultra-low temperature containers are not high, and the amount of evaporation of the contents is higher than in large containers.

Further, it is difficult to securely fix the inner tank 6 for both large and small containers, and as a result, the inner tank 6 is often damaged during transportation of the ultra-low temperature container.

(Means for solving the problem) This invention is an ultra-low temperature container in which a vacuum is created between the inner tank, the outer tank, and an intermediate tank provided as necessary. A heat insulating layer is formed on the inner and outer surfaces of the intermediate tank using a flexible and elastic heat insulating material, and a spherical heat insulating material in which the surface of an inorganic material is coated with a thin film-like reflective material is placed within the space between each of the heat insulating layers. The object of the present invention is to provide an ultra-low temperature container that can be filled to solve the above-mentioned problems.

(Example) This invention will be explained in detail based on the illustrated example.

FIG. 1 is a partially cutaway sectional view of a cryogenic container according to this invention formed of three tanks, and FIG. 2 is a view taken along the line A--A in FIG. 1.

The outer tank 8 is made of, for example, chrome-nickel stainless steel, and the inner surface of the outer tank is uniformly covered with a flexible and elastic heat insulating material, such as molded glass fiber, in a thickness of 30 to 40 mm. The heat insulating layer 9 is formed by stretching the heat insulating layer 9 to a certain thickness.

Further, the intermediate tank 10 has heat insulating layers 11 and 12 formed by uniformly covering the entire inner and outer surfaces with a flexible and elastic heat insulating material, such as molded glass fiber, to a thickness of 30 mm to 40 mm. Form.

Further, on the outer surface of the inner tank 13, a molded glass fiber similar to the above-mentioned heat insulating material is stretched to a thickness of 30 mm to 40 mm to form a heat insulating layer 14. It is formed by providing an expandable gap 15 that absorbs the water.

That is, each piece of the tile-shaped heat insulating layer 14 formed into a rectangular or rectangular shape is formed in close contact with the outer surface of the inner tank 13 with an expandable gap 15 provided therein.

Further, the intermediate tank 10 is formed by stretching an aluminum material or an aluminum alloy material, and the inner tank 10 is formed by stretching an aluminum material or an aluminum alloy material.
3 is formed using chrome/nickel stainless steel or the like.

Further, the spacing between the outer tank 8 and the intermediate tank 10 is formed such that a sufficient distance between the surfaces of the heat insulating layer 9 of the outer tank 8 and the heat insulating layer 11 on the outer surface of the intermediate tank 10 is provided.

Further, within the space between the heat insulating layer 9 of the outer tank 8 and the heat insulating layer 11 on the outer surface of the intermediate tank 10, and within the space between the heat insulating layer 12 on the inner surface of the intermediate tank 10 and the heat insulating layer 14 on the outer surface of the inner tank 13, there is a spherical shape. The entire area is filled with a heat insulating material 16, and a vacuum is formed within the separation interval.

In this case, the spherical heat insulating material 16, as shown in _FIG . 16
A is formed by coating a reflective material 16b made of a shiny metallic material, for example, a thin film of metal such as aluminum or stainless steel.

The coating of the reflective material 16b is formed by dipping the spherical body 16a into molten metal or by vapor deposition.

In the illustrated embodiment described above, the intermediate tank is formed into one tank, but if the intermediate tank is formed into two tanks,
The entire tank may be formed into four tanks, or the intermediate tank may be omitted and an outer tank and an inner tank may be formed.

(Function) Next, we will explain the function of the ultra-low temperature container according to this invention, which has a heat insulating layer made of flexible and elastic molded glass fibers, and a spherical heat insulating material coated with a metal material is filled between the heat insulating layers.

A liquefied gas exhibiting an ultra-low temperature is introduced into the inner tank 1 acid.

In this case, on the outer surface of the inner tank 13, there is a heat insulating layer 14 made of flexible and elastic formed glass fibers that have shrinkage/expansion properties and are stretched in a tiled manner with expansion/contraction gaps 15. The heat insulating layer 14 follows and absorbs the shrinkage.

Furthermore, due to the contraction of the inner tank 13, the lamination of the spherical heat insulating material 16 held by the flexible and elastic heat insulating layers 14 and 12 shrinks inward as a whole and becomes denser. The inner tank 13 is protected against vibrations during transportation, etc., because the inner tank 13 is firmly fixed by the heat insulating layers 14, 12, 11, 9 and the entire spherical heat insulating material, which have become denser to the extent that the tank is not damaged. It will not be damaged even if subjected to

The spherical heat insulating material 16 whose surface is coated with a reflective thin film made of a glossy and slippery metallic material is
Heat insulating layers 9, 11, 12 having flexibility and elasticity,
Since it is flexibly and elastically held by the inner tank 13
Even if the outer tank 8 and the intermediate tank 10 expand or contract, the spherical insulation material 16 will not settle down more than necessary,
Since the tanks are held as they are without being raised, compaction damage to each tank is eliminated, and no voids are created within the space between the filled insulation layers.

Furthermore, the radiation effect caused by the reflective material of the spherical heat insulating material 16 further improves the heat insulating performance and reduces the evaporation loss of the liquid content.

(Effects) According to this invention, first, a spherical heat insulating material whose surface is covered with an inorganic material with a thin reflective material is filled in the space between the heat insulating layers formed of a heat insulating material having flexibility and elasticity. Therefore, even if each tank with a heat insulation layer shrinks or expands at room temperature, the flexible and elastic insulation material will follow the expansion, contraction, and expansion. The effect of pressure on the material can be ignored and is safe. In addition, the effectiveness of the invention is that when each tank contracts at low temperatures or expands at room temperature, the spherical insulators are coated with a thin film-like reflective material and have a slippery structure. The flexibility and elasticity of the insulating material prevents the slippery spherical insulating material from settling or rising more than necessary, eliminating compaction damage in each tank, and allowing the filled spaces to This means that high heat insulation performance can be ensured without creating any voids within the tangent space.

Furthermore, when the inner tank contracts, the laminated layers of each heat insulating layer and each spherical heat insulating material shrink upward as a whole, and become denser to the extent that each tank is not damaged. Each heat insulating layer and the spherical heat insulating material as a whole firmly fix the inner tank, so even if the inner tank is subjected to vibrations during container transportation, it will not be damaged and will be safe. In addition, the space between each insulation layer, which has flexibility and elasticity, is filled with spherical insulation material whose surface is coated with a thin film of reflective material, so the insulation performance is synergistically improved. It also has the advantage of lowering the evaporation loss of the liquid, making it possible to provide an ultra-low temperature container that is easy to manufacture and at a lower cost than conventional examples.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway cross-sectional view of the cryogenic container according to this invention, and Figure 2 is A--A in Figure 1.
A view in the direction of arrow A, FIG. 3 is a partially cutaway sectional view of a cryogenic container showing one of the conventional examples, and FIG. 4 is a sectional view of a spherical heat insulating material. 8... Outer tank, 9, 11, 12... Heat insulation layer, 14
...Insulating layer, 10...Intermediate tank, 13...Inner tank, 1
6... Spherical insulation material.

Claims (1)

[Scope of utility model registration request] In an ultra-low temperature container where a vacuum is formed between the inner and outer tanks and an intermediate tank provided as necessary, flexible and elastic insulation is applied to the outer surface of the inner tank, the inner surface of the outer tank, and the inner and outer surfaces of the intermediate tank. 1. An ultra-low temperature container characterized in that a heat insulating layer is formed of a material, and a spherical heat insulating material in which the surface of the inorganic material is coated with a thin reflective material is filled in the space between each of the heat insulating layers.