Title:
CENTRIFUGAL PUMP
Document Type and Number:
WIPO Patent Application WO/2019/176426
Kind Code:
A1
Abstract:
A centrifugal pump (P) of the present invention comprises: first crossover blades (25) in which a static flow path (21) is formed over a diffuser flow path (22), a curved flow path (23), and a return flow path (24); and the same number of second crossover blades (26) arranged in the return flow path (24) downstream of the first crossover blades (25). Between the first crossover blades (25) and the second crossover blades (26), slits (27) that have a uniform distance in a radial direction with respect to all the blades (25 and 26) arranged in a circumferential direction and connect pressure surfaces (25a) of the blades (25) and negative pressure surfaces (26f) to each other are provided. The centrifugal pump (P) is characterized in that, among the blades (25 and 26) separated by the slits (27), leading edges (26A) of the second crossover blades (26) are displaced on an upstream side in a rotational direction of a centrifugal impeller (13) with respect to trailing edges (25B) of the first crossover blades (25).
Inventors:
TSUKAMOTO KAZUHIRO (JP)
PRUNIERES ROMAIN (JP)
OKIHARA TAKASHI (JP)
NAGAHARA TAKAHIDE (JP)
PRUNIERES ROMAIN (JP)
OKIHARA TAKASHI (JP)
NAGAHARA TAKAHIDE (JP)
Application Number:
PCT/JP2019/005098
Publication Date:
September 19, 2019
Filing Date:
February 13, 2019
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
F04D29/44; F04D1/08
Foreign References:
| JPH01149597U | 1989-10-17 | |||
| JP2013194558A | 2013-09-30 | |||
| JP2015094293A | 2015-05-18 |
Attorney, Agent or Firm:
ISONO INTERNATIONAL PATENT OFFICE, P.C. (JP)
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