| 摘要 |
PURPOSE:To prevent dewing on the inner surface of a housing by installing a metal plate with a good heat conduction in a state where said metal plate passes through the inside and outside of said housing, using the influence of a temperature difference between said inside and outside of the housing to cause dewing on the surface of said metal plate, and discharging the resulting water outward to lower the absolute temperature. CONSTITUTION:A housing 11 is of a closed structure, an electrical equipment 15 is arranged inside said housing, a hole 16 is made in a part of the housing 11, and a metal plate 17 is installed in a state of passing through the inside and outside of the board. In order that said metal plate 17 has the function of a dehumidifier, a copper or aluminum material with a good heat conduction is used as such plate, which is formed into an irregular shape 18 to make its surface area larger. Further, a pan 20 for receiving water droplets 19 from the metal plate 17 is installed to discharge said droplets outward through hygroscopic material or filter medium 23. Thus, the absolute temperature within the housing 11 can lowered and dewing can be caused on the surface of the metal plate 17 within the housing 11 following the drop of an atmospheric temperature to prevent dewing in other parts. |
