Patent ID: 7891942

Claim:
A centrifugal blower, comprising: a casing, having a top portion, a bottom portion and a side wall, the top portion having a first inlet, and the side wall respectively connecting the top portion and the bottom portion and having an outlet; a motor, fixed in the casing; a fan structure, disposed in the casing, the fan structure having a body connected to the motor and a plurality of blades surrounding the body, the blades being connected to the body, and the fan structure driven by the motor rotating about an axis in a first rotation direction; and a first anti-leakage element, extending from at least part of a first edge of the first inlet to an interior of the casing and partially covering parts of the blades, wherein the first anti-leakage element extends from neighborhood of the outlet in a second rotation direction against the first rotation direction, and a range of the first anti-leakage element extending to the interior of the casing is gradually reduced along the second rotation direction.