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    • 12. 发明专利
    • THERMALLY INSULATED CONDUIT
    • JPH0328598A
    • 1991-02-06
    • JP13425490
    • 1990-05-25
    • KABELMETAL ELECTRO GMBH
    • HARUTOMUUTO KURIYUUGERUIERUN HOOMANUORUFUGANGU NETSUTSUORUTO
    • F16L59/04F16L59/12F16L59/125F16L59/147
    • PURPOSE: To manufacture a thermally insulated conduit at low cost with good concentricity without a cavity of an insulation layer and without ununiformity, by forming a spacer from a material having many flat flow openings and having projecting parts for determining a distance between tube bodies. CONSTITUTION: A distance holding spiral body 5 of a spacer is made of a net- like forming material, and conical projecting parts 6 are formed in it. This net-like forming material is a fiber processed material of synthetic fiber or inorganic material fiber, the projecting parts 6 are formed in the fiber material by a deep drawing method, and the height of the projecting part 6 is equivalent to the desired thickness of an insulation layer 4. Moreover, the projecting parts 6 are arranged in two lines, transmission core wires 7 are provided between two lines, and the core wires 7 are connected to a power source. In using a conduit, leakage is informed by the core wires 7, and the corresponding place is determined. Next, pressure tightness of the projecting parts 6, for securing concentric arrangement of an inner tube body 1 in relation to an outer tube 2 and a collar formed on the tube during manufacturing is secured by impregnation of synthetic resin capable of being hardened before or after forming the projecting parts 6 in the net-like forming material.