| 摘要 |
PURPOSE:To make electrical power unnecessary for holding a compressor stopped in a compressor protecting device in a vehicle air conditioning system, by which the compressor is stopped when intake pressure is lowered, by providing a self-sustaining type latching relay in a compressor stopping outlet part that operates upon the detection of pressure drop. CONSTITUTION:When the low pressure side of a compressor 2 is below a predetermined pressure and therefore, a pressure detecting part 4 delivers a low pressure indicating signal to a timer 5, the timer 5 delivers a compressor stopping signal to a pulse part 6 if the low pressure condition is sustained more than a set time period. Thus, the pulse part 6 delivers pulses to an outlet part 7 for attracting a self-sustaining function type latching relay 29 of the outlet part 7, so that a magnetic clutch 1 is deenergized for stopping the compressor 2. Since the latching relay 29 has the self-sustaining function, the compressor 2 is maintained in its stopping condition with no electrical power consumption. |
