Patent ID: 9115724
Filing Date: 2015-08-25
Classification: F04D

Abstract:
1. A blade structure having a blade comprising: a blade root at one end; a blade tip located at the other end; a first vertex and a second vertex located between the blade root and the blade tip, wherein the blade is bent from the blade root to the first vertex, the blade tip, the second vertex, and to the blade root in sequence so as to form a hollow structure; and a first node and a second node between the blade root and the first vertex, wherein a maximum slope of a tangent of the blade to a first axis occurs at the first node and a maximum horizontal included angle between the blade and a second axis which is perpendicular to the first axis is formed by a line extending from the second node of the blades on a section taken along a third axis in which the second node is located thereon and the second axis; wherein the first vertex and the second vertex are located at a first side edge of the blade and respectively located at a first side and a second side of the first axis horizontally extended from the blade root, and a distance between the first vertex and the first axis is a maximum distance between the first axis and the first side edge in the first side of the first axis, and a distance between the second vertex and the first axis is a maximum distance between the first axis and the first side edge in the second side of the first axis; wherein a second side edge of the blade has a fifth node located on the section taken along the third axis in which the second node is located, and a maximum horizontal distance is between a section of the blade where the fifth node is set thereon along the third axis and a section of the blade where a central point is set thereon along the second axis at the third axis, and wherein the central point is located at a crosspoint between the section taken along the third axis in which the second node is located and the first axis, wherein the third axis is perpendicular to the first axis and the second axis, and the second side edge is located at another side of the first side edge of the blade along the second axis; wherein a horizontal included angle between the second node to the fifth on the blade and the second axis is 18 to 25 degrees.