Centrifugal blower having a bell-mouth ring for reducing noise

Details Centrifugal blower having a bell-mouth ring for reducing noise Centrifugal blower having a bell-mouth ring for reducing noise

1997-03-10

1998-09-29

Verdier, Christopher

Rotary kinetic fluid motors or pumps

Bearing, seal, or liner between runner portion and static part

Between blade supported radial tip ring and static part

415204, 415206, 4152081, 4152111, F04D 2944

Patent

active

058138315

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.

REFERENCES:
patent: 1149638 (1915-08-01), Davidson
patent: 3306528 (1967-02-01), Eck
patent: 4432694 (1984-02-01), Kuroda et al.
patent: 5352089 (1994-10-01), Tokunaga et al.
patent: 5511939 (1996-04-01), Tokunaga et al.

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