| 摘要 |
PROBLEM TO BE SOLVED: To increase the pressure of internal refrigerant using an inexpensive panel type heat exchanger without causing any increase of stress at the welded circumferential edge part of a panel. SOLUTION: The body of an electric apparatus and internal refrigerant 6 for insulating and cooling the body are contained in an enclosed container 1, circumferential edge parts 4c of two plate bodies 4a are secured by welding, and a panel type heat exchanger 3a internally conducting fluid is provided in the container 1. The panel type heat exchanger 3a is connected with inflow piping 5b and outflow piping 5a communicating with the outside of the container 1 so that external refrigerant 7 flows into the heat exchanger 3a through the inflow piping 5b and flows out therefrom through the outflow piping 5a thus increasing the pressure of the internal refrigerant 6 above the pressure of the external refrigerant 7.
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