Freezing pipe heat insulation device

A freezing pipe heat insulation device comprises an outer pipe and inner pipes, wherein the inner pipe is placed inside the outer pipe in interval and penetrating modes. Two ends of the outer pipe and the inner pipe are sealed through end socket rings to form a sealed cabin, and a pumping vacuum tube communicated with the sealed cabin is placed on the end socket rings. The freezing pipe heat insulation device is formed by welding of double layers of steel pipes and provided with the sealed cabin, the sealed cabin is protected by the outer pipe, the inner pipe is communicated with an upper freezing pipe and a lower freezing pipe, and the freezing pipe heat insulation device can penetrate through a low temperature saline water supply pipe, so that the freezing pipe heat insulation device is simple in structure, the freezing pipe can be butted conveniently, and the freezing pipe heat insulation device is corrosion-resisting. In the process of welding, installing and freezing, the sealed cabin ...