Patent ID: 7967557
Filing Date: 2011-06-28
Classification: F04D

Abstract:
1. A multiblade centrifugal blower, comprising: a centrifugal fan that includes: a scroll casing that includes an air inlet and an air outlet, and that houses the centrifugal fan inside such that the centrifugal fan faces the air inlet, wherein rotation of the centrifugal fan causes suction of air from the opening and the air inlet toward a direction of a rotating shaft of the motor, and causes discharge of the air through a space between the blades in a centrifugal direction so that the air is blown out from the air outlet, a length B a bell mouth is located at the air inlet such that a distance from a tip part of the inner edge of the blade to an inner wall of the scroll casing is minimum at an inner tip part of the bell mouth, and wherein a ratio B