Patent ID: 8926286
Filing Date: 2015-01-06
Classification: F04D

Abstract:
1. A propeller fan with two blades, comprising: a first blade and a second blade which are provided to be circumferentially separated from each other for performing air blowing according to rotation around an imaginary center axis, and which constitute the two blades; and a connection portion provided, when the propeller fan is viewed in an axial direction of said center axis and a smallest imaginary circle is drawn to circumferentially separate said first blade and said second blade from each other, to be arranged inside the imaginary circle for connecting said first blade and said second blade together, wherein each of said first blade and said second blade has a peripheral edge portion extending in an arc having a diameter D with said center axis as a center thereof, a front edge portion arranged on a forward side in a rotational direction, a rear edge portion arranged on an opposite side in the rotational direction and continuing to said peripheral edge portion, and a leading blade edge portion connecting said front edge portion and said peripheral edge portion and protruding toward the rotational direction, said front edge portion of said first blade and said rear edge portion of said second blade are connected together via said connection portion, a plane which includes each intersection between said rear edge portion and said peripheral edge portion in each of said first blade and said second blade and is perpendicular to said center axis is defined as γ, and when the propeller fan is viewed in a direction parallel to a plane including said leading blade edge portions of said first blade and said second blade and said center axis, a distance H between said plane γ and a connected portion between said front edge portion of said first blade and said rear edge portion of said second blade, on a line of said center axis, satisfies 0.028≦H/D≦0.056.