Title:
PUMP DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/171658
Kind Code:
A1
Abstract:
The present invention provides a multistage centrifugal pump device having excellent pump efficiency. Provided is a pump device having: an electric motor (1); impeller parts (14, 15) that are rotationally driven by the electric motor; and a casing (3) that is positioned so as to cover the outer circumferences of the impeller parts and that forms a pump chamber with an outer wall thereof, the pump device performing a centrifugal pump action through rotation of a rotary shaft of the electric motor. The casing has a stator vane (3a) including recessed sections (3c), and a return guide (24) has, on the back surface thereof, protruding sections (24e) to be fitted into the recessed sections.
Inventors:
SASAYAMA TOMOHIRO (JP)
HONDA TAKESHI (JP)
TSUKAMOTO KAZUHIRO (JP)
OHWADA MICHIO (JP)
HONDA TAKESHI (JP)
TSUKAMOTO KAZUHIRO (JP)
OHWADA MICHIO (JP)
Application Number:
PCT/JP2020/033018
Publication Date:
September 02, 2021
Filing Date:
September 01, 2020
Export Citation:
Assignee:
HITACHI GLOBAL LIFE SOLUTIONS INC (JP)
International Classes:
F04D29/44; F04D1/08
Domestic Patent References:
| WO2019176426A1 | 2019-09-19 |
Foreign References:
| JP2015143475A | 2015-08-06 | |||
| JPS6036702A | 1985-02-25 | |||
| JPS59122800A | 1984-07-16 | |||
| JPH06193585A | 1994-07-12 | |||
| US20010036404A1 | 2001-11-01 |
Attorney, Agent or Firm:
POLAIRE I.P.C. (JP)
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