Patent ID: 6152686
Filing Date: 2000-11-28
Classification: F02M,F04D

Abstract:
A unit for conveying fuel from a tank to the internal combustion engine of a motor vehicle, with a conveying pump (10) embodied as a flow pump, whose impeller wheel (12), which is rotatingly driven by a drive element (14), turns in a pump chamber (24), which is delimited in the direction of the axis of rotation (13) of the impeller wheel (12) by two oppositely located front walls (26, 28), and in the radial direction in relation to the axis of rotation (13) of the impeller wheel (12) by an annular wall (30), wherein the impeller wheel (12) respectively has a crown of vanes (32) on both its front faces, which are spaced apart from each other in the circumferential direction and are oriented radially outward, and wherein a groove is respectively arranged at the two front walls (26, 28), extending in the shape of a partial ring around the axis of rotation (13) of the impeller wheel (12) at the height of the vanes (32) which, together with the vanes (32) of the impeller wheel (12), respectively constitute a conveying channel (44), which, viewed in the direction of rotation (11) of the impeller wheel (12), lead from an inlet opening (40) on their start to an outlet opening (18) at their end, and wherein the impeller wheel (12) has an outer ring (36) connecting its vanes (32) at their radially outer ends, characterized in that a further crown of vanes (50, 70, 90) is arranged on the outer ring (36) of the impeller wheel (12), which are spaced apart from each other in the circumferential direction and are oriented radially outward and which, together with the front walls (26, 28) and with the annular wall (30) constitute at least one flow channel (58, 78, 94) extending at least in the form of a partial ring around the axis of rotation (13) of the impeller wheel (12), in which a pressure build-up in the direction of rotation (11) of the impeller wheel (12) takes place.