Patent ID: 9470241
Filing Date: 2016-10-18
CPC Classification: F04D,F05D

Claim Text:
1. A centrifugal blower comprising: a centrifugal fan; an electric motor that rotationally drives the centrifugal fan; a fan case that has an air inlet and an air outlet and that internally accommodates the centrifugal fan; and an electric motor case that has a cylinder accommodating the electric motor and a flange portion extending radially outward from the cylinder and that is fitted to the fan case, wherein an inner circumferential side of the flange portion is connected to the cylinder and is provided with, in a concentric manner with the cylinder, a ring-shaped rib portion that protrudes in an upward direction from the flange portion, and a groove portion for receiving water is provided between the inner circumferential side of the flange portion and an outer circumferential side of the cylinder; the ring-shaped rib portion is provided with a slit that extends from the flange portion in the axial direction of the cylinder; and when an axis of the cylinder is oriented vertically, the flange portion between the ring-shaped rib portion and the cylinder is configured to form a downward inclination in a circumferential direction toward the slit.