| 摘要 |
PROBLEM TO BE SOLVED: To provide fluid machinery capable of reducing a cost by forming an impeller blade 10 of a steel plate by a simple sheeting machine. SOLUTION: In this fluid machinery, a reference line orthogonal to a hub face and intersecting a rotating shaft is assumed, a plurality of parallel planes orthogonal to the reference line is supposed, the intersected line of these planes with the impeller blade 10 is approximated so as to be the arc of a circle with the same radius and so that the center point of the circle is positioned on the same straight line, and an elliptic tube containing these approximated arcs on the peripheral surface and having a center axis on the straight line is assumed. The peripheral surface of a portion where the approximated arc of the elliptic tube is present is approximated by a cylinder having a center axis parallel with the straight line, and a part of the peripheral surface of the cylinder is cut out to form the impeller vane 10. As necessary, the diameter of the cylinder and the direction of the center axis thereof are adjusted so that an inlet angle around the inlet of the impeller blade 10 and an output angle around the outlet thereof matches a fluid flow angle.
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