PROPELLER FAN
First Claim
1. A propeller fan, comprising a hub formed into a cylindrical shape, and a plurality of blades extending outwardly from a side surface of the hub, whereineach of the blades is configured such thata distance from a chord line to a mean line in a blade cross section is set as a camber, that in the blade cross section,a position on the chord line where the camber becomes maximum is set as a maximum camber position, thata ratio of a distance between a leading edge and the maximum camber position in the blade cross section to a chord length is set as a maximum camber position ratio, thatan end portion at the hub side of the blade is set as a blade root, thatan end portion of an outer circumferential side of the blade is set as a blade end, and thatthe maximum camber position ratio at the blade end is larger than the maximum camber position ratio at the blade root.
1 Assignment
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Accused Products
Abstract
In a blade of a propeller fan, a position on a chord line where the camber becomes maximum is set as a maximum camber position A, and a ratio of a distance d between a leading edge and the maximum camber position A to a chord length c is set as a maximum camber position ratio. The end portion on the hub side of the blade is set as a blade root, and the end portion on the outer circumferential side of the blade is set as a blade end. In the blade, the maximum camber position ratio monotonically increases in the direction from the reference blade cross section located between the blade root and the blade end toward the blade end and becomes maximum at the blade end. Thus, fan efficiency of the propeller fan is improved.
3 Citations
13 Claims
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1. A propeller fan, comprising a hub formed into a cylindrical shape, and a plurality of blades extending outwardly from a side surface of the hub, wherein
each of the blades is configured such that a distance from a chord line to a mean line in a blade cross section is set as a camber, that in the blade cross section, a position on the chord line where the camber becomes maximum is set as a maximum camber position, that a ratio of a distance between a leading edge and the maximum camber position in the blade cross section to a chord length is set as a maximum camber position ratio, that an end portion at the hub side of the blade is set as a blade root, that an end portion of an outer circumferential side of the blade is set as a blade end, and that the maximum camber position ratio at the blade end is larger than the maximum camber position ratio at the blade root.
Specification