Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Radial flow devices
Patent
1991-05-30
1993-02-09
Denion, Thomas E.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Radial flow devices
416DIG2, 416DIG5, 415119, B63H 126
Patent
active
051849380
ABSTRACT:
The invention relates to an axial fan with an essentially cylindrical outer housing and with a fan wheel which rotates therein and the hub of which is located on the rotor of an electric drive motor, the stator of the drive motor being held by webs extending on the delivery side relative to the outer housing. The vanes of the axial fan are radially twisted and possess a forward curvature with a camber varying from the hub cross-section to the outer cross-section. In order to achieve a pressure increase, at the same time with a reduction of the operating noise, the vanes have in the hub region a cross-section designed for a low flow per unit volume and small pressure increase, but in the outer region a cross-section designed for higher values of flow per unit volume and pressure increase.
REFERENCES:
patent: 2578806 (1951-12-01), Johnson
patent: 3023709 (1962-03-01), Kondo
patent: 4569631 (1986-02-01), Gray, III
patent: 4684324 (1987-08-01), Perosino
patent: 4729714 (1988-03-01), Wrobel
patent: 4767262 (1988-08-01), Simon
patent: 4840541 (1989-06-01), Sakane et al.
Denion Thomas E.
Papst-Motoren GmbH & Co. KG
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