| 摘要 |
PROBLEM TO BE SOLVED: To provide a low noise turbo fan excellent in air flow rate performance. SOLUTION: This fan consists of a main plate 12 covering a motor (not indicated in a figure) and fixed on a shaft (not indicated in a figure) of the motor, a shroud 13 including a suction part 13b and a blow-out part 13c, a plurality of blades 11 arranged between the main plate 12 and the shroud 13. The shape of the uppermost part of the blade 11 is formed by maintaining a camber line of a cross section and continuously turning the same in a turning direction of the main plate 12 around a front edge of the blade 11 and the same thickness is distributed over the camber line. Since the blade 11 is of the same cross section shape and a flow to a negative pressure surface in an inclined zone on a blade 11 upper part is induced while keeping base characteristics of the blade 11, especially low noise, air flow rate performance is improved. COPYRIGHT: (C)2006,JPO&NCIPI
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