Patent ID: 9745981
Date: 2017-08-29
CPC Classifications: F04D,F04F,F24F

Claim:
1. A nozzle for a fan assembly, the nozzle comprising: an air inlet; at least one air outlet; an annular inner wall at least partially defining a bore through which air from outside the nozzle is drawn by air emitted from said at least one air outlet, wherein the inner wall comprises an outwardly flared frusto-conical front section; an outer wall extending about a longitudinal axis and about the inner wall; and an interior passage located between the inner wall and the outer wall for conveying air from the air inlet to said at least one air outlet; wherein the interior passage has a first section and a second section each for receiving a respective portion of an air flow entering the interior passage through the air inlet, and for conveying the portions of the air flow in opposite angular directions about the bore; and wherein each section of the interior passage has a cross-sectional area formed from the intersection with the interior passage of a plane which extends through and contains the longitudinal axis of the outer wall, wherein the cross-sectional area of each section of the interior passage decreases in size about the bore and a length of the outwardly flared frusto-conical front section in a radial direction from the longitudinal axis decreases in size about the bore.