Rotary compressor of oil cooling type with appropriate oil discharge circuit

Claim 1

In a rotary compressor of the oil cooling type comprising: an unloader, a housing including a rotor chamber therein and connected to said unloader, rotors housed within said housing, said rotor chamber having a discharge port from which an oil-air mixture is discharged under pressure, and a discharge chamber which is in communication with said discharge port, a check valve with a further port provided in said discharge chamber, discharge conduit means communicated with said discharge chamber through said check valve and said further port, a reservoir for compressed air and oil connected at an air space formed therein to said discharge pipe, and second conduit means communicated with said reservoir at the oil space therein and said rotor chamber, said discharge chamber having a second opening which is positioned at a lower portion than said further port, whereby oil is separated from the oil-air mixture and collected in said lower portion, an oil discharge pump drivably connected to one of said rotors, said oil discharge pump being connected at one side to said second opening through third conduit means and at the other side to said reservoir through fourth conduit means whereby the oil is delivered from the discharge chamber to the reservoir continuously during operation of the compressor.