| 摘要 |
PURPOSE:To prevent the corrosion of a coil for a radiator due to sulphuric constituents by a method wherein an inner tube is inserted into an outer tube and the high-temperature steam or water of underground is flowed through the inner tube to transmit the heat thereof to water in the outer tube. CONSTITUTION:Both ends of the innr tube 2 are communicated with expansion tubes 3, 3' and the outer tube 1 is secured integrally with the outer peripheral surfaces of the both ends of the expansion tubes 3, 3' after the both ends of the outer tube 1 are squeezed while coupling flanges 4, 4' are projected from both ends of the outer tube 1. Coupling tubes 5, 5' are welded at the upper and lower surfaces of the outer tube 1 near both ends thereof and an arbitrary number of outer tubes 1 are arranged in parallel in up-and-down direction and left-and-right direction to communicate the coupling tubes 5, 5' mutually. The upper and lower coupling tubes 5, 5' are communicated with a hot-water tube and a water returning tube while the hot-water in the outer tube 1 is circulated through the radiator to heat a room. |
