High-vacuum multi-layer flexible heat-insulated pipe for high-temperature superconducting cable and manufacturing method thereof

The present disclosure provides a high-vacuum multi-layer flexible heat-insulated pipe for a high-temperature superconducting (HTS) cable and a manufacturing method thereof. The flexible heat-insulated pipe includes an outer pipe, an inner pipe, and a connecting flange. The flexible heat-insulated pipe further includes: a vacuum interlayer (1) located between the inner pipe and the outer pipe; a multi-layer heat-insulting material (2), which is located at an inner side of the vacuum interlayer close to an outer wall of the inner pipe and is configured to achieve heat insulation; and protrusions (3) on the outer wall of the inner pipe, which are configured to reduce a contact area between the multi-layer heat-insulting material and the outer wall of the inner pipe. In the heat-insulated pipe of the present disclosure, there is a small contact area between the heat-insulting material and the outer wall of the inner pipe, high vacuum efficiency, and prominent heat-protection performance. In addition, the method of the present disclosure can accurately calculate and simulate heat leakage data of different heat-insulated pipes, thereby providing a strong guarantee for the design of a heat-insulated pipe and the verification of performance of a heat-insulated pipe. 1 - 2