| 摘要 |
PROBLEM TO BE SOLVED: To enhance the nozzle efficiency by changing the inner shape of a blow nozzle and to reduce a jet noise. SOLUTION: In the blow nozzle, when the radius of the entrance port of the nozzle is defined as r0, the radius of the exit port of the nozzle is defined as r1, the length in the axis direction of a shrinkage stage of the nozzle is defined as L, the distance in the axis direction from the starting end of the shrinkage stage of nozzle is defined as x and the radius of the nozzle at the distance x is defined as r, a curved line represented by a formula: r= r1 1-[1-(r1/r0)2]×(1-x2/L2)2/(1+x2/3L2)2}-1/2 or an approximate curve is prepared. The curved line is rotated making an axis X as the center and a curved surface thus formed is made to be a shrinkage stage of the inner shape.
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