| 摘要 |
<p>PROBLEM TO BE SOLVED: To effectively prevent freezing of an evaporator by closing a pilot valve by breaking current-carrying to a solenoid of a flow rate control valve drive mechanism, closing a flow rate control valve, and stopping reduction of evaporator side pressure of an upstream side from the flow rate control valve in a low pressure side refrigerant passage. SOLUTION: A means for regulating the pressure of a refrigerant intake chamber 7 formed on a rear housing of a compressor, and a crank chamber 5 is provided with a flow rate control valve 31 for opening a spool valve 33 energized in the valve closing direction by a spring 34 with pressure acted in a pressure chamber 35. Then it is provided with a flow rate control valve drive mechanism 32, which is disposed in a passage 40 for communicating a refrigerant delivery chamber 8 and the pressure chamber 35 with each other, and which has a pilot valve 41 whose opening is controlled by the excitation of a solenoid 42 and which is disposed for leading high pressure side refrigerant into the pressure chamber 35. Also the device is provided with a feed back means 46 for regulating an opening of the flow rate control valve 31 by sensing the change by a diaphragm 47, when pressure of an evaporator side disposed upstream from the flow rate control valve 31 is changed more than constant pressure.</p> |
