Slant plate-type variable displacement compressors with capacity control mechanisms

摘要

A slant plate-type variable displacement compressor includes a housing enclosing a crank chamber, a suction chamber, and a discharge chamber. The housing includes a cylinder block, and cylinder bores are formed therein. Pistons are slidably disposed within the cylinder bores. A valve member is disposed in a first passage, which communicates between a discharge side of the cylinder bore and the crank chamber. The valve member is controlled by a suction pressure of the cylinder bore. A second passage communicates between the crank chamber and a suction side of the cylinder bore through an orifice for allowing pressure to release. A cross-sectional area of the orifice is variably controlled, such that when compressor operation begins, the cross-sectional area of the orifice is greater than that during a capacity control operation.