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US 4,538,963 AGranted
Impeller for cross-flow fan
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTakashi Sugio, Makoto Obata, Shotaro Ito
Life of this patent
Estimating the term…
Abstract
An impeller for a cross-flow fan, including a plurality of impeller sections. Each impeller sections includes a pair of plate members and a number of blades extending between and circumferentially of the plate members such that the blades are circumferentially spaced at random pitch angles without periodicity.
Claims5
An impeller for a cross-flow fan, comprising:
- a plurality of successively adjacent, parallel confronting circular plate members, at least three in number, axially spaced along a rotational axis extending perpendicularly through the respective centers of said plate members;
- and
- a plurality of axially coupled blade sections, each defined between a respective successively adjacent pair of said plate members and including a respective plurality of blades, substantially greater than five in number extending radially outwardly of said axis between, and mounted at opposite axial ends thereof to, said successively adjacent pair of plate members, the blades of each of said blade sections being circumferentially spaced at respective random pitch angles about said axis without periodicity;
- no more than five of said blades of each of said blade sections being angularly located about said axis so as to be angularly aligned within 1.degree. of any of the blades of an adjacent one of said blade sections.
1 more element
Dependencies are inferred from the claim text.