| 摘要 |
<p>PROBLEM TO BE SOLVED: To simultaneously achieve reduction of a cost of a heat insulation cover body, simplification of an assembly work of the heat insulation cover body into a heat cylinder, and great reduction of power consumption.SOLUTION: A heat insulation cover body 30 includes: a plurality of split cylinders 31 made by splitting a cylindrical body with a larger diameter than a heat cylinder 20 along the axial direction; a plurality of spacers 40 and 45 made by molding a material excellent in adiabatic properties, and provided on the inner peripheral surface of the split cylinder 31 along the circumferential direction; and holding means for holding the plurality of split cylinders in a cylindrical form. The plurality of split cylinders 31 are separated through the spacers 40 and 45 from the heat cylinder 20, and a plurality of annular spaces 33 surrounding each heater 23 are defined between the peripheral surfaces of the plurality of split cylinders 31 and the heat cylinder 20 through the spacers 40 and 45 brought into contact with the outer peripheral surface of the heat cylinder 20.</p> |
