Patent ID: 6729863
Filing Date: 2004-05-04
Classification: F04C

Abstract:
A pump for generating pressure or negative pressure, comprising a pump chamber (32) which has a high-pressure port and a low-pressure port; two rotors (28, 30) having at least two blades and fitted to two parallel shafts (20, 22) in the pump chamber (32) that are offset to each other, the shafts (20, 22) defining an axial direction; a drive (10) arranged on an end face of the rotors (28, 30) and a housing cover (34) arranged on the opposite side, the housing cover (34) being configured cup-shaped and the high-pressure port as well as the low-pressure port being integrated in the housing cover (34), wherein the inner wall (44) of the housing cover (34) delimits the pump chamber (32) on an end face and has two axial openings (46, 48) for the high-pressure port and the low-pressure port and the axial openings (46, 48) are each adjoined by one channel (40, 42) which is integrated in the body of the housing cover (34), at least one of the channels (40, 42) leading to the circumference of the housing cover (34) and opening out there, the axial opening (48) for the high-pressure port, in operation of the pump, being covered by one of the rotors (28, 30) for a time to enable inner compression of the delivered medium.