Patent ID: 7473078
Filing Date: 2009-01-06
Classification: F04D

Abstract:
1. A centrifugal blower comprising: a scroll casing defining a scroll passage having a suction port, from which air is drawn, and a discharge port from which air is discharged; a fan member disposed rotatably in the scroll casing; and a motor which applies a rotation force to the fan member, wherein: the fan member includes a plate member having at least a first circular plate portion and a second circular plate portion which are arranged in an axial direction to have a step shape in cross section, and a plurality of blades which are arranged at an outer peripheral portion of the plate member and extend in the axial direction; and the plate member is arranged to change a flow direction of air drawn by the fan member from the suction port in an axial direction, to a radial outside; wherein the fan member includes a plurality of centrifugal fans which are arranged on each of the first and second circular plate portions in a circumferential direction.