Patent ID: 8967949
Filing Date: 2015-03-03
Classification: F04D,Y10S,Y10T

Abstract:
1. A sound-proofed helicocentrifugal fan comprising: a helicocentrifugal propeller; a motor coupled to the helicocentrifugal propeller; a first casing surrounding the helicocentrifugal propeller and the motor, the first casing having a central piece with a circular cross section and first and second end pieces coupled to the central piece, a surface of the first end piece, a surface of the second end piece, and a surface of the central piece are perforated with a distribution of holes except in an area surrounding the helicocentrifugal propeller; first and second coupling pieces coupled respectively to the first and second end pieces and adapted to be coupled to respective air circulation pipes to which the fan is attached; a blanket having a sound-absorbing material surrounding the first casing, the blanket having a circular cross section that encircles the first casing; and a second casing surrounding the blanket, the second casing having a circular cross section that encircles the blanket.