Composite structure heat insulation pipe and using method thereof

The invention provides a composite structure heat insulation pipe and a using method thereof. The composite structure heat insulation pipe comprises an inner pipe and an outer pipe which are coaxially sleeved from inside to outside, wherein the interior of an annular containing cavity formed between the inner pipe and the outer pipe is a vacuum environment, a tubular structure shielding layer is arranged in the containing cavity around the periphery of the inner pipe in the axial direction of the inner pipe, and an inner side annular cavity formed between the inner pipe and the shielding layer and an outer side annular cavity formed between the shielding layer and the outer pipe each are filled with a heat preservation material. All conventional heat transfer paths are systematically analyzed, blocking structures are designed one by one according to different transfer modes, and all heat transfer processes are systematically and fully considered. 本发明提供了一种复合结构绝热管及其使用方法，所述的复合结构绝热管包括由内至外同轴嵌套的内管和外管，所述的内管和外管之间形成的环