JPS5856273B2 - cryostat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cryostand for storing cryogenic cryogen, and in particular to a structure of a mobile cryostat that is installed in a moving object such as a vehicle, and whose cryogen surface is swayed by the acceleration and deceleration of the moving object. be.

FIG. 1 is a diagram showing an example of this type of cryostat.

The inner container 1 is adiabatically surrounded by the outer container 2.

A high vacuum space is formed between the inner container 1 and the outer container 20, and a radiation shielding plate 3 is disposed within the space.

The inner container 1 and the radiation shielding plate 3 are supported on the outer container 2 by a support 5.

5 is a cryogenic cryogen stored in the inner container 1.

The opening of the gas release pipe 1 is located in the uppermost gas region 6 in the middle of the inner container 1, and releases the gas vaporized within the inner container 1 to the outside of the outer container 2.

This gas release is always performed through the same pipe when the internal pressure of the inner container 1 is normal, and when the internal pressure is abnormally increased, the valve 8 is fully opened to release a large amount of gas.

This valve 8 has a valve structure that is branched into two parts, one of which is used as a gas release valve at all times when the internal pressure is normal, and the other part is used as a safety valve that opens only when the internal pressure rises abnormally.

When the cryostand constructed in this manner is moved in a car, it may be subjected to an acceleration 9a as shown by a solid line or an acceleration 9b as shown by a broken line as shown in FIG.

Due to this acceleration 9a or 9b, the liquid level of the cryogen 5 becomes
10a for acceleration 9a1 1 for acceleration 9b
0b, and it comes to cover the pipe 7.

Therefore, the gas in the gas region 6a cannot be released from the pipe 7 in response to the acceleration 9a, and the gas in the gas region 6b in response to the acceleration 9b cannot be released from the pipe 7, and the internal pressure of the inner container 1 increases.
Further, due to this increase in internal pressure, the cryogen 5 is pushed and flows into the pipe 7, overflows and is discharged to the outside of the outer container 2.

In either case, there is a problem that a large amount of the cryogen 5 in the inner container 1 is lost and the internal pressure increases.

The present invention was made to eliminate the above problems, and
Even if the acceleration/deceleration increases in either direction, the cryogen does not flow out from the pipe 1, and the vaporized gas is always released outside the outer container 2 to prevent an abnormal increase in the internal pressure of the inner container 1. .

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 3, the same reference numerals as in FIGS. 1 and 2 indicate the same or equivalent parts.

The opening 11a of the first pipe 7a is provided above one end surface within the inner container 1, and the opening 11b of the second pipe γb is provided above the other end surface within the inner container 1.

The first pipe 7a is connected to the first pipe 7b in the inner container 1 via a bent part 12b located above the end surface on the opening 11b side of the second pipe 7b in the inner container 1. Piping 7
Bent portion 12 located above the end surface on the opening 11a side of a
The connecting pipes 7c are connected to each other through the connecting pipes 7a and 7c.

This connecting pipe 7c communicates with the gas discharge pipe 7 via a connecting part 13 located in the gas phase.

In such a configuration, when the horizontal acceleration 9a is applied and the liquid level of the cryogen 5 becomes 10a, the first pipe 1a
Since the opening 11a and the bent portion 12a are located in the gas region 6a, the liquid level of the cryogen 5 flowing into the second pipe 7b from the opening 11b of the second pipe 7b is at the same level as 10a. '.

Therefore, the vaporized gas in the inner container 1 is released to the outside of the outer container 2 through the gas release pipe 7, and the refrigerant does not flow out of the outer container 2.

Similarly, even if the horizontal acceleration 9b is applied and the liquid level of the cryogen 5 becomes 10b, since the opening 11b and the bent part 12b of the second pipe 7b are located in the gas region 6b, The liquid level of the cryogen 5 flowing into the second pipe Ta from the opening 11a of the first pipe 1a becomes the same level 10b' as 10b.

Therefore, the vaporized gas passes through the gas release pipe 1 to the outer container 2.
The cryogen 5 will not flow out of the outer container 2.

FIGS. 4 and 5 show main parts of another embodiment of the present invention.

In the embodiment shown in FIG. 4, the first pipe γa is directly connected to the gas discharge pipe 7 via the bent part 12b, and in the embodiment shown in FIG.
A is also used as the gas discharge pipe 7, and the second pipe 7b is connected to the connecting part 13 located in the gas phase of the first pipe 7a via the bent part 12a1 and the connecting pipe 7c. Both are similar to the embodiment shown in FIG.

Even with this configuration, the operation and effect are the same as those of the embodiment shown in FIG.

In the embodiments shown in FIGS. 3 to 5, the pipes and connecting pipes are configured in vertical cross sections, but it is natural that they may be configured on the same horizontal plane.

As explained above, according to the present invention, vaporized gas can always be released to the outside of the outer container no matter which direction acceleration/deceleration is applied, so the internal pressure of the inner container will not increase. Moreover, since the cryogen is not directly leaked out from the gas discharge piping, the loss of the cryogen is extremely small.

[Brief explanation of drawings]

FIG. 1 is an implicit sectional view for explaining an example of a conventional cryostand, FIG. 2 is an implicit sectional view for explaining its operation, and FIG. 3 is an example of an embodiment of the cryostand of the present invention. Suggestive sectional views for illustration, Figures 4 and 5
The figure is a suggestive sectional view of essential parts for explaining another embodiment of the present invention. 1...Inner container, 2...Outer container, 3...
...Radiation shielding plate, 5...Cryogen, 6,6a
16b... Gas area, 7... Piping for gas release, 7a... First piping, 1b...
...Second pipe, 7c...Connecting pipe, 11a...
...First pipe opening, 11b...Second
Opening of piping, 13...Connection.

Claims (1)

[Claims] 1. A cryostand that has an inner container that stores a cryogenic cryogen, an outer container that adiabatically surrounds the inner container and has a room temperature atmosphere, and a gas release pipe that is drawn out horizontally from the inner container to the outer container. In the inner container, there is a first pipe having an opening in a gas region corresponding to acceleration/deceleration in a first direction, and a second pipe having an opening in a gas region corresponding to acceleration/deceleration in a second direction. In addition to providing piping, a connecting portion between the first piping and the second piping is arranged so as to communicate with one of the gas regions by gas, and the gas discharge piping is connected to the connecting portion. A cryo stand that is characterized by: