| 摘要 |
An evacuated double-tubing solar heat collector including an inner tube, a selective absorption film applied over an exterior surface of the inner tube and an outer tube. The inner tube is constructed to be received within the outer tube and a spring ring is positioned on the inner tube for engaging an interior surface of the outer tube as the inner tube is inserted into the outer tube for spacing the inner tube relative to the outer tube. The spring ring is rotatably positioned on the inner tube to facilitate the insertion of the inner tube into the outer tube. Further, the inner tube includes an open end and the outer tube includes an open end which are fused to form a junction and hermetically sealed after the inner tube is inserted into the outer tube.
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