| 摘要 |
A cooker and/or radiant-heating space heater system comprises a plurality of arcuate sheet metal shell segments assembled with overlapping edge portions so as to form a substantially cylindrical inner shell surrounded by a plurality of similarly overlapping arcuate segments which may be spaced selectively relative to the inner shell and to each other so as to vary the spaces thus defined between the inner shell and the outer segments. The inner shell is spaced above a support surface such as the ground, and the outer segments rest on the support surface so that a combustion zone within the inner shell is in communication with the spaces between the inner shell and the outer segments. For highly efficient combustion, air is drawn down such spaces, due to negative pressure induced by convection over a fire within the combustion zone, and preheated through contact with the hot inner shell prior to entering the combustion zone. Draft control is effected by selectively positioning the outer segments radially with respect to the inner shell. A pot of somewhat lesser diameter than the inner shell may be supported substantially within the inner shell above the fire in the combustion zone for efficient heating of foodstuffs or water in such container. A relatively broad and shallow vessel such as a frying pan or Chinese wok may be supported above the inner shell for heating by radiation and conduction from products of combustion.
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