| 摘要 |
PROBLEM TO BE SOLVED: To provide a draining structure for a heating impeller of a heating device, which is capable of improving thermal efficiency by preventing retaintion of the drain in a heat transfer surface part. SOLUTION: The heating impeller 2 of the heating device for heating with steam sent as a heating source and stirring is provided and the drain discharge structure for the heating impeller is constituted so that a rotary shaft 18 of the heating impeller 2 is formed into a double tube, the center shaft of which is used as a steam supply pipe 16 and the outer periphery of which is used as a drain recovery pipe 17, a hollow spiral impeller 19 spirally revolved around the rotary shaft 18 is arranged on the periphery of the rotary shaft 18, one end part of the spiral impeller 19 is communicated with a steam supply pipe 16 and another end is communicated with a drain recovery pipe 17 and the drain generated in the spiral impeller 19 is moved with the rotation of the heating impeller 2 to be returned to the drain recovery pipe 17.
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