Patent ID: 7052259
Filing Date: 2006-05-30
Classification: F04C

Abstract:
1. A vacuum pump comprising: a housing having a first side face, a second side face opposite from the first side face, and a rotor chamber between the first and second side face; a pair of screw rotors in mesh with each other and rotably disposed in said rotor chamber to define a gas transfer chamber between an inner wall of said housing and grooves of said pair of screw rotors, each of said screw rotors having at least one thread extending at least 720 degrees therearound; a suction port and an exhaust port, both communicatable with said transfer chamber, such that three sections are formed in said transfer chamber including a suction section in communication with said suction port, an exhaust section in communication with said exhaust port, and a transfer section therebetween through which gas is forced from the suction section to the exhaust section; wherein said exhaust port is formed in said second side face.