Lubricating oil flow control for a rotary compressor

Claim 1

A rotary compressor for gaseous fluids comprising a first pump rotor with external helical teeth, a second pump rotor with internal helical teeth, the helical teeth on said rotors registering with each other as they rotate about parallel axes, a rotor housing, a pair of rotor chambers communicating with each other formed in said housing, one chamber receiving the external tooth rotor and the second chamber receiving the internal tooth rotor, said housing including an end wall closing said rotor chambers, said wall being disposed adjacent end suRfaces on said rotors, the end surface on one of said rotors having formed therein radially disposed metering chambers, a lubricating oil inlet chamber formed in said wall at a radial location where it is adapted to register with radially inward portions of said metering chamber, said lubricating oil inlet chamber being in fluid communication with a lubricating oil supply passage, a fluid discharge chamber formed in said wall at a radially outward location relative to the axis of rotation of said one rotor and arranged to register with the radially outward portions of said metering chambers as said rotors rotate, said discharge chamber being in communication with said rotor chambers whereby metered quantities of fluid are discharged therethrough upon rotation of said rotors thereby providing a flow of lubricating oil through said compressor that is proportional in magnitude to the speed of rotation of said rotors.