Patent ID: 6439865
Filing Date: 2002-08-27
Classification: F04C

Abstract:
A pump for simultaneously generating pressurized air and vacuum, comprising a pump chamber within a housing, said pump chamber having a suction port, a pressure port and a pair of charging ports connected to atmosphere, whereinsaid pump chamber accommodates a pair of rotors rotating in opposite directions around parallel axes spaced from each other, each rotor having at least three claw-shaped blades; said rotors intermesh free of contact so that, together with a peripheral wall of said pump chamber, they define cells that are separate from each other; said rotors, together with said pump chamber, define a suction cell that is connected to said suction port and whose volume increases during rotation of said rotors; upon further rotation of said rotors, said suction cell separates into a pair of separate charging cells; upon further rotation of said rotors, each charging cell passes across an associated one of said charging ports; said charging cells on further rotation of said rotors merge into a pressure cell; said pressure cell on further rotation of said rotors decreases in volume; said pressure cell being connected to said outlet port on further rotation of said rotors for pushing air out from said pressure cell through said outlet port.