JPS6014442B2 - hollow superconductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hollow superconductor having a hollow portion serving as a cooling medium passage.

The conventional hollow superconductor of this gutter generally has a single hollow part through which a cooling medium flows in one direction.

However, with this structure, the temperature of the cooling medium increases when it returns to the cooling device after flowing through the hollow part, resulting in poor cooling efficiency and the need for a large-capacity cooling device. There were drawbacks. In addition, the cooling medium is
Since it flows in only one direction along the superconducting element, there is inevitably a difference between the upstream and downstream temperatures of this cooling medium.
This caused the problem that the entire center of the superconducting element could not be cooled to a uniform temperature. The present invention has been made in view of the above points, and involves inserting a superconducting element into the outer tube so as to form two hollow portions spaced apart from each other, and using these as an outward path and a return path for the cooling medium, respectively. This provides a hollow superconductor that achieves uniform cooling of the entire center of a superconducting element and improved cooling efficiency.

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, 1 is the outer tube, which is made of SUS28 with high low-temperature strength and poor thermal conductivity, for example, with a thickness of 0.5 ribs and a width of 32 skin.
The flat plate was formed into a rectangular tube shape, and the end surfaces were melted with TIG.

A superconducting element 2 is inserted into the outer tube 1 and held at the center of the outer tube 1 by four spacers 3. Each of the supertorque conductive elements 2 is made of, for example, about 10 wires of 0.30 (as an example, Nb 50% by weight, '
An alloy wire with an ri of 50%) stabilized with copper,
As a whole, it is formed into a rectangular cross-section with a width of about 5 kites and a thickness of about 2 legs. Hollow portions 4 on both sides of this superconducting element 2
, 5 are the forward and return paths of the cooling medium, respectively.
50 kg in the hollow superconductor constructed as above. When a Gaussian magnetic field is applied and supercritical pressure He gas of 10 k9/min is passed through the hollow parts 4 and 5 as a cooling medium, and the superconducting element 2 is energized while being cooled to below the critical temperature, 80
A stable superconducting state can be obtained with no resistance value down to approximately 0 ampere.

As described above, according to the present invention, by forming two hollow parts separated from each other by sandwiching the superconducting element in the outer tube, one of which is used as an outgoing path for the cooling medium, and the other is used as an incoming path,
The cooling efficiency of superconducting elements can be significantly improved. That is, in the present invention, the cooling medium flowing in the return path exchanges heat with the cooling medium flowing in the outgoing path via the superconducting element, thereby suppressing the temperature rise as much as possible. Therefore, it is possible to use a cooling device with a relatively small capacity. Further, the temperature of the cooling medium flowing in the outgoing path increases from the upstream side to the downstream side of the outgoing path.
Similarly, the temperature of the cooling medium flowing through the return path further increases from the upstream side to the downstream side of the return path. Therefore, the temperature difference between the cooling medium flowing at the most upstream end of the outgoing path and the cooling medium flowing at the most downstream end of the returning path is the largest, and the temperature difference between the cooling medium flowing at the downstream end of the outgoing path and the cooling medium flowing at the most upstream end of the returning path is the largest. A relationship with a small temperature difference is automatically formed. The outbound and return routes are separated by a superconducting element that also functions as a heat exchange wall. Therefore, the center of the superconducting element, which functions as a partition wall, is kept at a uniform temperature in the longitudinal direction, that is, along the outward and return paths, and as a result, the entire center of the superconducting element is maintained at a uniform temperature. It can be cooled to a certain temperature, and ideal cooling can be achieved. Note that the spacer 3 in the above embodiment is not necessarily necessary, and the outer tube itself may be deformed to form a protrusion, and the superconducting element may be positioned and held by this protrusion.

A simple explanatory diagram of the drawing is a sectional view of a hollow superconductor according to an embodiment of the present invention.

1...Outer tube, 2...Superconducting element, 3.
...Subesa, 4,5...Hollow part.

Claims (1)

[Claims] 1. A stabilized superconducting element is inserted into the outer tube so as to double as a partition wall forming two hollow parts spaced apart from each other in the longitudinal direction between the inner surface of the outer pipe and the two hollow parts. A hollow superconductor characterized in that one of the sections is an outgoing path for a cooling medium, and the other is an incoming path for the cooling medium.