| 摘要 |
PROBLEM TO BE SOLVED: To provide a small size low specific speed centrifugal pump maintaining high efficiency and high cavitation property and reducing pressure pulsation and noise without increasing initial cost of a centrifugal pump which is the centrifugal fluid machine. SOLUTION: This small size low specific speed centrifugal pump is composed of an impeller 1 sucking in fluid from an intake port 9 and delivery the same from an outlet port 10 and a volute chamber 2 connecting the fluid to a delivery pipe 13. The impeller 1 composed of a impeller main plate 4 including a plurality of blades 5 and a impeller side plate 6. Axial direction flow passage width 16 in a blade impeller pressure surface 7 side in a range from the blade pressure surfaces 7 to a blade negative pressure surface 8 and from an impeller inlet 14 to an impeller outlet 15 or between the impeller inlet 14 and the impeller outlet 15 over whole circumference of the impeller 1 is narrower than axial direction flow passage width 17 in the blade negative pressure surface 8 side. COPYRIGHT: (C)2005,JPO&NCIPI
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