Control Valve And Variable Capacity Compressor Provided With Said Control Valve

摘要

A control valve is disclosed that drives a valve body in a valve closing direction against urging forces of a bellows assembly and an open spring by an electromagnetic force generated in an electromagnetic coil portion by a drive current subjected to pulse width modulation. The control valve is provided with a notch portion formed in an inner peripheral wall of a through hole portion disposed in an end wall of a solenoid housing, so that a magnetic resistance between a peripheral wall of a movable iron core housed in a housing member and the inner peripheral wall of the through hole portion in a region of the notch portion differs from that in the other region around the movable iron core. In addition, a variable displacement compressor controls a refrigerant gas discharge displacement by use of this control valve.

主权项

1. A control valve comprising:
a valve unit having a valve body that opens and closes a fluid passage in a valve housing and a movable iron core coupled with the valve body; a housing member having a tubular shape with a bottom and that houses the movable iron core; a drive coil portion disposed around the housing member; a solenoid housing that houses the drive coil portion, one end of which is fixed to the valve housing, and the other end of which is provided with an end wall covering an upside of the drive coil portion and having a through hole portion through which a bottom wall side end portion of the housing member is extended; and urging means for urging the valve unit in a valve opening direction, the control valve being configured to drive the valve body in a valve closing direction against an urging force of the urging means by an electromagnetic force generated in the drive coil portion by supply of a drive current subjected to pulse width modulation, wherein the electromagnetic force is adjusted, thereby adjusting an opening degree of the valve body, wherein there is provided, around the movable iron core, a region in which a magnetic resistance between the movable iron core in the housing member and an inner peripheral wall of the through hole portion varies.