| 摘要 |
<p>A furnace or space heater is operable at low cost by a small electric motor which rotates an elongated cylindrical drum on a vertical axis, within an elongated cylindrical casing at a clearance of about one eighth of an inch in the annular chamber formed therebetween. A supply of light lubricant normally occupies the lower portion of the annular chamber but rises to fill the chamber during rotation of the drum. The casing is enclosed in a housing, having a fan chamber containing an electric motor and fan or blower. The motor shaft may rotate both the fan and the drum.</p> |
