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Patent Searching and Data


Title:
PUMP DEVICE
Document Type and Number:
Japanese Patent JP2001107900
Kind Code:
A
Abstract:

To realize a stable operation over a wide operation range by delaying a generation of a stalling phenomenon at a low flow rate area and inhibiting a generation of cavitation phenomenon at a high flow rate area in a double reverse rotation pump.

A pump device is provided with a pump part 1 in which a pair of impellers 2, 3 circumferentially reversely rotating each other are coaxially disposed in a pump casing; and a driving motor part 4 having internal and external double rotor type electric motor. A pair of impellers 2, 3 mentioned above are bonded to the respective internal and external rotors 5, 6 of the driving motor part 4 and are driven.


Inventors:
Ishii, Masaharu
Goto, Akira
Aoki, Noboru
Kanemoto, Toshiaki
Application Number:
JP1999000285416
Publication Date:
April 17, 2001
Filing Date:
October 06, 1999
Export Citation:
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Assignee:
EBARA CORP
International Classes:
F04D15/00; F04D3/00; F04D29/66; (IPC1-7): F04D29/66; F04D3/00
Attorney, Agent or Firm:
渡邉 勇 (外2名)