Patent ID: 7744341
Filing Date: 2010-06-29
Classification: F04D,H01L

Abstract:
1. A centrifugal blower comprising: a top lid defining a first air inlet therein; a bottom plate defining a second air inlet therein; a sidewall disposed between the top lid and the bottom plate; an air outlet defined between the top lid and the bottom plate and in front of the sidewall; and an impeller disposed in an inner space formed between the top lid, the bottom plate and the sidewall, for driving air entering the centrifugal blower via the first and second air inlets and leaving the centrifugal blower via the air outlet; wherein a diameter of the first air inlet is greater than that of the second air inlet, an edge of the bottom plate defining the second air inlet and located adjacent to the air outlet is located nearer to a rotation axis of the impeller than an edge of the top lid defining the first air inlet and located adjacent to the air outlet; and wherein the second air inlet has an edge which is located opposite to the air outlet and is coincident with an edge of the first air inlet opposite the air outlet.