To obviate the inflow of an electric current into a drive circuit due to counter electromotive force by installing a capacity control valve, altering the extent of pressure in a control pressure chamber, on a passage interconnecting this control pressure chamber and an inlet pressure area or discharge pressure area, and connecting a flywheel circuit to a solenoid making the valve element operate to open or close.
When a piston 36 is reciprocated by rotation of a swash plate 23, coolant gas taken into a cylinder bore 12a is discharged to a discharge chamber 39 via a discharge valve 43. At this time, a capacity control valve 49 is installed in a pressure supply passage 48 connecting this discharge chamber 39 and a crankcase 15, a pressure detecting passage 50 is made up in space between an inlet passage 32 and the capacity control valve 49. In succession, a diode 97 is installed in a storage space 93 of the capacity control valve 49, and cathode of this diode 97 is connected to the puls terminal of a combination 95, and the anode to a minus terminal, respectively, constituting a flywheel circuit against a solenoid 74, and any possible inflow of an electric current in the case where counter electromotive force has occurred in this solenoid 74 is checked.
MIZUFUJI TAKESHI
SONOBE MASANORI
KUBO YUJI
