PISTON TYPE COMPRESSOR

摘要

A piston type compressor wherein each of the intake ports (43) of a cylinder block (11) comprises a narrow passage (50) on the top dead center side and a wide passage (51) on the bottom dead center side. The intake communication passage (45) of a rotary valve (41) is passed through the first trailing edge (50b) of the narrow passage (50) before passed through the second trailing edge (51b) of the wide passage (51). The high-pressure groove (47) of a residual gas bypass groove (46) faces only the narrow passage (50) of the intake port (43A) when it communicates with the intake port (43A) corresponding to a high-pressure side compression chamber (26). The width (Tc) of the rotary valve (41) between the first trailing edge (50b) and the second leading edge (51a) of the wide passage (51) in the rotating direction is smaller than the seal width (W) of a seal area (S) portion between the high-pressure groove (47) and the outlet (45b) of the intake communication passage (45). As a result, a compression efficiency can be increased by suppressing the intake loss amount of gases into the compression chamber while advancing the intake start timing of the gases into the compression chamber.