JPH01183104A - Superconducting device - Google Patents

Abstract

PURPOSE:To enable the freezing ability of an refrigerator to be sufficiently transmitted to its housing container, by inserting obstacles with low thermal conductivity into the gap made by the refrigerator and the housing container. CONSTITUTION:When a refrigerator 10 is operated, the temperatures of the first stage and the second stage become 20K and 80K respectively. So, a gas medium 15 arround a coupling body 23 produces aireddies of big convection in the gap made by the refrigerator housing container 13 and the coupling body 23. Obstacles 22 are inserted into the gap between the refrigerator housing container 13 and the coupling body 23 to prevent the convection of this gas medium 15. Thus, the gas medium in the gap between the refrigerator 10 and the housing container 13 is brought into a state that the occurrence of the convection is difficult, because the gap has become narrower owing to the obstacles 22. This enables transmitting the cooling ability of the refrigerator 10 to object to be cooled, just like when the refrigerator 10 is used in the vertical state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device using a superconducting magnet, and particularly to a superconducting device suitable for using a refrigerator for cooling a superconducting magnet in a horizontal state. .

[Conventional technology]

In the conventional device, as described in U.S. Pat.
A fluid is sealed between the stage and the second stage and the refrigerator storage container enclosing them.
It transfers the cold heat of the stage to the refrigerator container.

[Problem to be solved by the invention]

In the above conventional technology, when the refrigerator and the refrigerator storage container are operated in a horizontal state, the gap between the refrigerator and the refrigerator storage container is large. Creates convection in the horizontal direction. In particular, 2
In a refrigerator having two stages, the refrigerating capacity of the second stage (low temperature side) is impaired by horizontal convection.

An object of the present invention is to sufficiently transmit the refrigerating capacity of a refrigerator to a storage container of the refrigerator.

[Means to solve the problem]

The above object is achieved by inserting a pair of thermally conductive members into the gap formed between the refrigerator and the storage container of the refrigerator.

The superconducting device of the present invention is constructed by filling a gaseous medium into the gap formed by the cooling section of a horizontally mounted refrigerator and a container into which the cooling section of the refrigerator is inserted. It is preferable that the above-mentioned refrigerator has two cold heads and that the obstacle is installed between the two cold heads.

[Effect]

The gap between the horizontal refrigerator and the storage container of the refrigerator is narrowed by embedding an obstacle with low thermal conductivity.

As a result, horizontal convection is less likely to occur in the gas medium interposed in the gap between the refrigerator and the storage container of the refrigerator. Therefore, heat can be sufficiently transferred from the refrigerator to the storage container of the refrigerator.

Furthermore, by using a material with low thermal conductivity for the obstruction in the gap between the containers of the refrigerator, the amount of heat conducted from the components is reduced.

〔Example〕

Hereinafter, one embodiment of the present invention will be described using FIGS. 1 to 4.

1 in FIG. 1 is a superconducting coil, and 2 is a cryogen for cooling the superconducting coil 1. The cryogen 2 is stored in the cryogen container 3. Further, the cryogen 2 is injected through an injection pipe 4, and the evaporated cryogen gas is discharged into the atmosphere through a gas pipe 5. Reference numeral 6 indicates a second shield, and reference numeral 7 indicates a first shield, each of which shields radiant heat. 9 is a vacuum container for vacuum insulating the inside. 10 is a Keihod McMahon cycle compact refrigerator having two cooling sections. 11 is the first stage of the small refrigerator, and 12 is the second stage, with outputs of 65W (at 80K) and 6W (at 80K), respectively.
It has a freezing capacity of 20K). 13 is a refrigerator storage container that houses the refrigerator. 14 is a pipe for injecting the gas medium 15 into the gap between the cooling part 11.12 of the refrigerator and the refrigerator storage container. The gas medium is a gas with high thermal conductivity,
For example, helium is good. 16 is a valve, and by closing this valve, the gas medium is transferred to the refrigerator storage container 13 and the cooling section of the refrigerator 10 (the first stage 11 and the second stage 1).
2) The gap is sealed.

Reference numeral 17 denotes a first connector attached to the refrigerator storage container 13 in the vicinity of the first stage 11 of the refrigerator 10. Similarly, 18 is a second connector attached to the refrigerator storage container 13 at a position near the second stage 12 of the refrigerator 10. In addition, the connectors 17 and 18 are connected to the first connector. It is thermally connected to the second shield 7.6. 1st. The second connectors 17 and 18 are made of a material that conducts heat well, such as copper or aluminum. 21 is an 0 ring.

Reference numeral 22 denotes an obstacle inserted between the connecting body 23 connecting the first stage 11 and the second stage 12 and the refrigerator storage container 13.

FIG. 2 is a sectional view taken along line A-A. 19 in Fig. 2 tightens the second connector and connects the refrigerator storage container 13 and connector 18.
This is a bolt to improve the thermal connection with the others,
The same reference numerals as in FIG. 1 indicate the same parts. Figure 3 shows
FIG. 2 is a sectional view taken along line B-d in FIG. 1; Numeral 19 is a bolt for tightening the connector 17 to improve the thermal connection between the connector 17 and the refrigerator container 13 in the same manner as shown in FIG. Other symbols in Figure 2 and the same symbols as in Figure 1 are as follows:
showing the same thing. FIG. 4 is a sectional view taken along line CC in FIG. 1.

The operation of the embodiment will be explained below. A gaseous medium 15 is sealed in a gap formed between the refrigerator storage container 13 and the cooling section of the refrigerator 10 (first and second stages 1.1.12, connecting body 23, etc.). The outer diameter of the second stage 12 is
Since the diameter of the refrigerator storage container 13 is larger than the diameter of the second stage 12, the inner diameter of the refrigerator storage container 13 around the connecting body 23 is larger than the outer diameter of the second stage 12 in order to attach the cooling part of the refrigerator 10 to the refrigerator storage container 13. ing. Therefore, the gap between the connecting body 23 and the surrounding refrigerator storage container 13 becomes large.

If no obstruction 22 is inserted, the gaseous medium enclosed in this gap will tend to flow freely. In particular, when the refrigerator 10 is operated, the temperatures of the first stage 11 and the second stage 12 become 20 and 80 degrees, respectively, so that the gas medium 15 around the connector 23 flows into the refrigerator storage container 13 and the connector 23. A large convective vortex is created within the gap formed. Since this convection vortex exchanges heat between the first stage and the second stage, the refrigerating capacity transmitted from the second stage to the second connector is reduced. In this patent, an obstacle 22 is inserted into the gap between the refrigerator storage container 13 and the connecting body 23 in order to prevent the convection of the gaseous medium. This obstacle 22 should be something that can fill the gap as much as possible and has a low thermal conductivity. For example, it is preferable to use materials such as felt-like fibers, glass fiber cloth, or mats that are relatively elastic, have limited voids to the extent that convection is suppressed, and have low thermal conductivity.

If the thermal conductivity is high, the obstacle 23 will be removed from the first stage 11.
Heat is transmitted to the second stage 12 via the connector, reducing the cooling performance at the second connector. The obstruction 22 is the gaseous medium 15
By preventing the convection of The refrigeration capacity of the stage is connected to the first connector, and the refrigeration capacity of the second stage is connected to the second connector.
Since it can be transmitted to the connector, the first. Both the second shield is well cooled, resulting in a superconducting device with less evaporation of cryogen.

Note that the obstacle 22 may also be inserted into a gap formed between the first stage 11 and the flange 24 at room temperature.

Further, even if the refrigerator has only one cooling stage, the spirit of the present invention can be implemented.

〔Effect of the invention〕

According to the present invention, the gas medium in the gap between the cooling part of the refrigerator and the container housing the cooling part of the refrigerator is in a state where convection is difficult to occur due to the narrowing of the gap due to obstacles. This has the effect of transmitting the cooling capacity of the refrigerator to the object to be cooled in the same way as when it is used vertically.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, FIG. 3 is a cross-sectional view taken along line B-B in FIG. 1, and FIG. FIG. 2 is a sectional view taken along line CC in FIG. 1; 10... Refrigerator, 11... First stage, 12...
・Second stage, 13... Freezer storage container, 15...
・Gas medium, 17... 1st connector, 18... 2nd connector 2nd port 4 Old 23... Sand 4

Claims (1)

[Claims] 1. In a superconducting device in which a gas medium is sealed in a gap formed by a horizontally mounted cooling unit of a refrigerator and a container into which the cooling unit of the refrigerator is inserted, an obstacle with low thermal conductivity is installed in the gap. A superconducting device characterized by: