Patent
Centrifugal blower having a bell-mouth ring for reducing noise
TLDR
In this article, a bell-mouth ring is formed with a casing to be disposed proximately at an outer radial side of a shroud, which has a deflection wall surface for deflecting a flow of air blown out radially outwardly from the centrifugal multi-blade fan and further flowing radially inwardly toward the rotation axis.Abstract:
A bell-mouth ring is formed with a casing to be disposed proximately at an outer radial side of a shroud. The bell-mouth ring has a deflection wall surface for deflecting a flow of air blown out radially outwardly from the centrifugal multi-blade fan and further flowing radially inwardly toward the rotation axis along an inner wall surface of the casing, toward the driving means. In this way, it is possible to suppress air from flowing backward to a suction port through a gap between the shroud and the bell-mouth ring. Accordingly, it is possible to reduce the noise generated by an interference of the air sucked from the suction port with the air flowing backward or by the turbulence of the air flow which is generated in the gap.read more
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Patent
Single or multiple stage blower and nested volute(s) and/or impeller(s) therefor
TL;DR: In this paper, an impeller consisting of a top shroud, a bottom shroud, and a plurality of vanes extending from the top shroud to the bottom shroud is defined, such that a radially inner portion of the vane at the bottom edge of each vane is not in contact with or adjacent the bottom board.
Patent
Centrifugal multiblade blower
TL;DR: In this article, a cascade of counter-flow prevention is used to prevent part of air flowing through a scroll chamber from flowing through the first aperture defined between a multiblade fan and a suction-side case plate of a scroll casing.
Patent
Centrifugal type blower unit
TL;DR: In this paper, a slant portion is formed in each blade of the centrifugal fan at a side of the air suction port so that an inner radius dimension of the fan is increased toward the air port.
Patent
Centrifugal Fan, Cooling Mechanism, and Apparatus Furnished with the Cooling Mechanism
Toru Tamagawa,Yusuke Yoshida +1 more
TL;DR: In this article, the diameter of the impeller is rendered less than 20 mm, yet by rotating the fan under rotational conditions in which the centrifugal force along the periphery is 10,000 m/s2 or more, the static pressure that the fan generates is heightened, rendering the vane spacing a predetermined width or less reduces noise.
Patent
Centrifugal fan device and eletronic device having the same
TL;DR: In this paper, the authors proposed a method to reduce the deviation in the amount of air blown out of the air outlet by diverting the air flowing to an air outlet into a centrifugal fan side and a side wall side of the diverting member.
References
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Patent
Multi-blades fan device
TL;DR: In this paper, a multi-blade fan with a bottom plate and a plurality of circumferentially spaced blades and a casing for the fan assembly therein having an outlet duct extending therefrom for discharge of the air flows is described.