Heat-insulating multi-layer pipe for superconducting power transmission and laying method thereof

Abstract

The present invention provides a heat-insulating multilayer pipe for superconducting power transmission that does not break a separator and has high heat insulation even if it is laid by a roll method. The heat-insulating multilayer pipe for superconducting power transmission includes: a superconducting cable; a multilayer pipe composed of a plurality of straight pipes and containing the above-mentioned superconducting cables; Between two adjacent straight pipes in the pipe, the cross-sectional shape of the plane perpendicular to the longitudinal direction of the above-mentioned heat-insulating multilayer pipe for superconducting power transmission of the above-mentioned spacer is a polygon with three or more vertices, and the above-mentioned spacer A through hole is provided in the center of the surface perpendicular to the longitudinal direction of the superconducting heat-insulating multilayer tube for power transmission, and the inner straight tube of the two adjacent straight tubes is arranged to pass through the through hole, and the spacer and The coefficient of friction μ between the inner straight pipes among the above-mentioned two adjacent straight pipes i 0.1 or less, the coefficient of friction μ between the spacer and the outer straight pipe among the two adjacent straight pipes o 0.1 or less, the diagonal equivalent length L of the above polygon d The ratio L of the inner diameter d of the outer straight pipe of the two adjacent straight pipes above d / d is 0.9 or less.

Description

technical field [0001] The present invention relates to a thermal-insulated multiple pipe for superconducting power transmission, and in particular, to a thermal-insulated multiple pipe for superconducting power transmission that can be preferably used for laying on the seabed using reel-laying barge Tube. In addition, the present invention relates to a laying method of the above-mentioned heat-insulating multilayer pipe for superconducting power transmission. Background technique [0002] When cooling metals, alloys, etc., the superconducting phenomenon in which the electrical resistance drops sharply to zero at a certain temperature is studied and applied in various fields. Among them, superconducting power transmission using a cable in a superconducting state has been promoted into practical use as a power transmission method without power loss during power transmission. [0003] In superconducting power transmission, in order to maintain the cable in a superconducting ...

AI Technical Summary

Problems solved by technology

[0011] However, when the conventional heat-insulating multilayer pipes described in Patent Document 1 are to be laid by the above-mentioned reel method, it is known that there is a problem that the spacers provided between the pipes are damaged.

[0012] In addition, in the case of a multilayer pipe using a corrugated pipe as described in Patent Document 2, although it is easy to lay the pipe due to its flexibility, it can be seen that sufficient heat insulation cannot be obtained.

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