Rotary piston compressor with inlet and discharge through the pistons which rotate in the same direction

摘要

A rotary piston machine is provided in which the, or each, auxiliary rotary piston has a portion projecting axially beyond at least one end face of the main rotary piston, and in which a transfer port is provided in an end wall of the main rotor bore leading to the part of the auxiliary rotor bore containing said projecting portion of the auxiliary rotary piston and a discharge port is provided leading from said part of the auxiliary rotor bore at a position spaced from the transfer port, said projecting part of the auxiliary rotary piston providing a rotary valve for opening and closing communication between the transfer port and the discharge port at the required times during the rotational cycle of the machine.