| 摘要 |
<p>PURPOSE:To prevent dew from being formed at heat radiation fins when a heat generating element of an inverter is to be cooled. CONSTITUTION:Signals got from a thermistor 44 fixed to a heat radiation fin 41 and another thermistor 47 for sensing a temperature of surrounding air are inputted to a control means 48. In the case that the temperature of the heat radiation fin 41 is higher than the temperature of surrounding air, the control means 48 controls an operation in such a way that a solenoid valve 46 is turned on. Accordingly, refrigerant flows into a bypassing refrigerant pipe 45 so as to cool the heat radiation fin 41. As a temperature of the heat radiation fin 41 becomes lower than the temperature of the surrounding air, the solenoid valve 46 is turned off under control of the control means 48 so as to prevent occurrence of dew formation and a flow of refrigerant in the bypassing refrigerant pipe 45 is shielded and a cooling of the heat radiation fin 41 is stopped.</p> |
