| 摘要 |
Disclosed is a double walled pan that includes an inner shell, an outer shell having a radius greater than that of the inner shell wherein ends of the outer and inner shells are sealed so as to provide a space between the outer and inner shells, a heat medium injected in the space, and a heat transfer plate bonded between the outer and inner shells, wherein a flow path of the heat medium is formed at the heat transfer plate or outer shell. The heat transfer plate is a disc, a concentric recess is formed between a center and an edge of the disc so as to have a predetermined width, and at least two straight grooves extend from the concentric recess to the edge. And, the heat transfer plate is flat, the flow path of the heat medium is formed at the outer shell, an outer heat transfer plate is installed at a lower part of the outer shell, and the outer heat transfer plate has at least one groove having the same shape of the outer shell.
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