Patent ID: 6086332
Filing Date: 2000-07-11
Classification: F04C

Abstract:
A pump assembly comprising:a motor including an output shaft:a housing mounted on said motor and receiving said shaft therein; said housing including an open rear end adjacent said motor and an open opposite front end;a cylindrical member disposed within said housing and including an inner circumferential wall, an open front end including a circumferential rim and an open opposite rear end including a circumferential rim, a first closure member overlying said front end of said cylindrical member, a second closure member overlying said rear end of said cylindrical member;a cylindrical hub having an outer circumference disposed within said cylindrical member and eccentrically mounted on said output shaft and rotatable therewith;a plurality of vanes disposed about said outer circumference of said hub, said vanes being radially displaceable with respect to said cylindrical hub and in a direction toward said inner circumferential wall of said cylindrical member upon rotation of said cylindrical hub whereby ambient fluid is drawn into said cylindrical member, compressed and exhausted from said cylindrical member;a cap member covering said front end of said housing and capturing said cylindrical member within said housing, said cap member and said first closure member including first respective openings therethrough for enabling the flow of ambient fluid into said cylindrical member and second respective openings therethrough for enabling the flow of compressed fluid from said cylindrical member to a location outside said cap member; andresilient means disposed between said rear end of said housing and said second closure member overlying said rear end of said cylindrical member and providing a biasing force which urges said second closure member into a selective sealing relationship of said second closure member with said circumferential rim of said rear end of said cylindrical member, said selective sealing relationship being a function of said biasing force asserted by said resilient means.