| 摘要 |
PROBLEM TO BE SOLVED: To minimize a rotational constituent of an absolute velocity of air flow on the outlet side of a jet fan and turn a pair of impellers by means of a single driving means. SOLUTION: The impellers 26, 28 arranged face to face on the common central axial line are turned in the opposite directions mutually, and blades 26F, 28F of the impellers 26, 28 are arranged so that their rotational constituents of the absolute velocity of air flow in the impellers 26, 28 are cancelled by each other.
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