| 摘要 |
PURPOSE: A double pipe for an electric boiler is provided to reduce heating time and to save fuel by inserting a support bar into a hole formed at an outer pipe and keeping the interval between the inner and outer pipes. CONSTITUTION: An inner pipe(11) is installed at a combustion chamber. Holes are formed at the outer circumference of an outer pipe(10). Support bars(13) are inserted and welded to the holes, and uniformly keep the interval between the inner and outer pipes.
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