| 摘要 |
PROBLEM TO BE SOLVED: To provide an impeller capable of preventing generation of noise by reducing pulsation. SOLUTION: In this impeller provided with a shroud 4, a crown 5 located on an upper side of the shroud 4 and a plurality of vanes 31 held between the shroud 4 and the crown 5, a crown side outlet port of the vane 31 is made more than 0.7 times as large as a shroud side outlet port.
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