Blade member for fluid pump

Abstract

The object is to obtain reasonably a blade member for a pump having superior fluid transporting performance. A blade member for a fluid pump includes a cylindrical portion formed around a rotational axis, a plurality of base portions protruding radially outwardly of the rotational axis from one end portion of the cylindrical portion along the rotational axis and provided along a circumferential direction, a bent portion bent from each of the respective base portion in one direction along the rotational axis, and a hole portion provided in a border portion between root portions of the adjacent base portions. A rising edge portion extending from the hole portion to a leading end of the bent portion and an overhang edge portion extending from the hole portion to a leading end of the base portion are formed by a common cut portion.

1 . A blade member for a fluid pump, comprising:
 a cylindrical portion formed around a rotational axis;   a plurality of base portions protruding radially outwardly of the rotational axis from one end portion of the cylindrical portion along the rotational axis and provided along a circumferential direction;   a bent portion bent from each of the respective base portion in one direction along the rotational axis; and   a hole portion provided in a border portion between root portions of the adjacent base portions;   wherein a rising edge portion extending from the hole portion to a leading end of the bent portion and an overhang edge portion extending from the hole portion to a leading end of the base portion are formed by a common cut portion.   
     
     
         2 . The blade member for a fluid pump according to  claim 1 , wherein:
 the bent portion includes, at a leading end portion of the rising edge portion, a rising leading end edge portion intersecting this rising edge portion;   the base portion includes, at a leading end portion of the overhang edge portion, an overhang leading end edge portion intersecting this overhang edge portion; and   at the edge portion of whichever shorter one of the rising edge portion and the overhang edge portion, this edge portion and the leading end edge portion intersecting it together form an angle which is an obtuse angle.   
     
     
         3 . The blade member for a fluid pump according to  claim 2 , wherein the length of the rising edge portion is made longer than the length of the overhang edge portion. 
     
     
         4 . The blade member for a fluid pump according to  claim 1 :
 wherein:   there is set a straight cutting-raising line from the hole portion toward the outer circumference; and   when the work is cut and raised by the cutting-raising line, one edge portion forms the rising edge portion and the other edge portion forms the overhang edge portion.   
     
     
         5 . The blade member for a fluid pump according to  claim 4 , wherein the cutting-raising line has a line width smaller than a hole diameter of the hole portion.