Hydro Turbine

Abstract

A hydro turbine includes at least two annular wheel discs, a center shaft disposed at the centers of the annular wheel discs, spokes disposed between the annular wheel discs and the center shaft, and a plurality of blades annularly disposed at the annular wheel discs. The number of the blades is at least 28 and at most the integer number of an outer circumference measured in centimeters of one annular wheel disc. The sum of arc length of one side of all the blades is 0.85-2 times the outer circumference. A blade angle formed between two line segments connecting the middle point to the two endpoints of an arc of each blade is in a range of 100°-170°. A blade installation angle formed between the chord line of the arc and a radius line of each annular wheel disc is in a range of 15°-75°.

What is claimed is: 
     
         1 . A hydro turbine, comprising:
 at least two annular wheel discs;   a center shaft, disposed at the centers of the annular wheel discs, the axis direction of the center shaft being vertical to radial directions of the annular wheel discs;   a plurality of spokes, disposed between the annular wheel discs and the center shaft and disposed along the radial directions of the annular wheel discs; and   a plurality of blades, annularly disposed at the annular wheel discs, wherein the number of the blades is at least 28 and at most the integer number of an outer circumference measured in centimeters of one annular wheel disc, the blades are arc-shaped, the sum of arc length of one side of all the blades is 0.85-2 times the outer circumference of one annular wheel disc, a blade angle is formed between two line segments respectively connecting the middle point to the two endpoints of an arc of each blade, the blade angle is in a range of 100°-170°, a blade installation angle is formed between the chord line having the maximum chord length of the arc of each blade and a radius line of each annular wheel disc passing through an outer endpoint of the blade, and the blade installation angle is in a range of 15°-75°.   
     
     
         2 . The hydro turbine according to  claim 1 , wherein the center shaft is a hollow shaft. 
     
     
         3 . The hydro turbine according to  claim 1 , further comprising two cover plates respectively disposed on sides of the two annular wheel discs back to the blades.