Impeller for transverse fan

Details Impeller for transverse fan Impeller for transverse fan

1993-03-01

1993-11-30

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Perimetric blading extending axially between annular members

416187, 416200R, 416203, 415119, F04D 2966

Patent

active

052660079

ABSTRACT:
A transverse fan impeller (30) having at least two modules (32). Each module is defined by an adjacent pair of partition disks (34) each perpendicularly centered on the rotational axis of the impeller. Blades (31) extend longitudinally between pairs of partition disks. The angular spacing of blades in a module is nonuniform but also not random, being determined by application of certain formulae disclosed. The angular blade spacing within each module of the impeller is the same, but the modules are angularly offset so that a blade in one module is offset from the corresponding blade in an adjacent module by a predetermined value. The module and blade configurations reduce both the blade rate tonal noise and overall radiated noise produced as compared to an impeller having uniformly spaced blades.

REFERENCES:
patent: 4253800 (1981-03-01), Segawa et al.
patent: 4474534 (1984-10-01), Thode
patent: 4538963 (1985-09-01), Sagio et al.
patent: 5064346 (1991-11-01), Atarashi et al.
R. C. Mellin & G. Sovran, Controlling the Tonal Characteristics of the Aerodynamic Noise Generated by Fan Rotors, Am. Soc'y of Mechanical Eng'rs Paper No. 69 WA FE-23 (1969).

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