Patent ID: 6224358
Filing Date: 2001-05-01
Classification: F01C

Abstract:
A rotary pump apparatus and integrated valve system which has a vent opening size that varies according to the rate of volume increase or decrease in the inner volume and outer volume, comprising:a. two primary rotors, having primary rotor shafts;b. two secondary rotors, having secondary rotor shafts, where said primary rotors are arranged so that they are each set at 90 degrees from the secondary rotors, and spaced so that the sealing edges of each rotor will move along arcual sides of the adjacent rotors during concurrent rotation;c. a valve set having primary disk top covers, fixed in position along the primary rotor shaft at the top of each primary rotor, where each said primary cover defines at least two apertures each set at 180 degrees from each other along the circumferential edge of said primary top cover, and which rotate within defined primary disk guides of an end plate, with secondary top disks fixed to the secondary rotor shafts, and which rotate immediately above said primary disks, and a non rotating cover plate, fixed above the rotating secondary disks; andd. a housing, into which the rotors are placed, with the open end of said housing closed off by said end plate and valve set, where said rotor set defines an inner and outer volume within said housing.