A method for designing an impeller having a flow path expansion type swept Francis vane, an impeller manufactured thereby, and a submersible pump having an impeller having a flow path expansion type swept Francis vane

摘要

The present invention relates to a method for designing a vane of an impeller for sucking and discharging a fluid, an impeller manufactured by this design method, and a submersible pump having the same. The design method of an impeller having a flow path expansion type swept Francis vane according to an embodiment of the present invention is a disc portion in which a shaft portion to which a drive shaft is coupled is formed in the center, and from one end positioned in the shaft portion to 150° or more and 270° or less. A pair of swept Francis vanes including a pair of swept Francis vanes formed in a spiral form so that the other end positioned on the circumference of the disc part is positioned in the rotational direction at an angle, and selecting a shape variable and a performance function of the swept Francis vanes, the swept Francis vanes analyzing the change of the performance function with respect to a pre-selected reference shape of In the design method of an impeller having a flow path extension type swept Francis vane, comprising the step of deriving an optimal shape variable through the RSA technique based on the performance function calculated by the LSH technique, the shape variable is the swept Francis vane The other end of the Francis vane with respect to the entrance angle formed by one end of the Francis vane with respect to the first reference line connecting the study and one end of the swept Francis vane, and the second reference line connecting the shaft hollow portion and the other end of the swept Francis vane The shape variable derived in the step of deriving the optimal shape variable includes an exit angle formed by this, wherein the entry angle is 71° to 73°, and the exit angle is 75° to 76°.