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    • 11. 发明专利
    • CLEANING METHOD OF HEAT EXCHANGER AND DOUBLE TUBE
    • JPH07167584A
    • 1995-07-04
    • JP31148193
    • 1993-12-13
    • TANIMOTO KAZUO
    • TANIMOTO KAZUO
    • F28F19/00F28D7/14
    • PURPOSE:To reduce manufacturing cost by providing a double tube which includes an outer tube and an inner tube made of polyolefin resin which is inserted into the outer tube and effect heat-exchange between cold water or hot water flowing in the outer pipe and hot water or cold water flowing in the inner pipe. CONSTITUTION:A double tube 14, which is the main part of a heat exchanger 10, is housed in a spiraled state just like a coil inside a housing 12. The double tube 14 includes an outer tube 16 which is made of a flexible material, such as soft vinyl chloride. An inner tube 18 made of polyolefin resin having a high strength, such as polybutene is inserted into the outer tube. This construction prevents the generation of such a trouble that the inner tube 18 will be damaged by the pressure of cold water flowing inside. It is, therefore, possible to eliminate the need to install a pressure control valve or the like as in a prior art, and hence simplify the structure and reduce manufacturing cost.