| 摘要 |
1470832 Helico-centrifugal pumps ITT INDUSTRIES Inc 2 May 1974 [9 May 1973] 19306/74 Heading F1C In a pump, e.g. a submersible pump, comprising a housing containing a motor-driven impeller 5 and a stationary diffuser assembly 13, 14, the diameter Di of the impeller hub at its inlet end is between 40 and 80% of the maximum diameter D2 of the impeller, the angles between a plane normal to the impeller axis and the inlet and outlet edges of the impeller blades 9 are 10 to 30 degrees and 15 to 90 degrees respectively and the angles between the plane and the inlet and outlet edges of the diffuser blades 14 are 30 to 60 degrees and 75 to 105 degrees respectively. The impeller blades have substantially straight leading portions and curved trailing portions and define helical flow-paths. The inlet edges of the blades may be radial or backwardly curved and the radially outer edges 10 may be parallel to the impeller axis.
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