Patent Number: 6,305,910

Title: Multi-stage pump device

Abstract: A multi-stage pump device includes a plurality of pump devices, each of the pump devices having a pump portion feeding working fluid under pressure, and a connecting portion provided between at least two of the pump devices, through which working fluid pumped by the respective pump devices passes. The connecting portion is expandable in a direction of the length thereof and is provided with a sealing structure to prevent a leakage of the working fluid. The connecting portion may be two telescopically arranged pipes or a bellows.

Inventors: Miura; Atsuyuki (Aichi-ken, JP), Naito; Yoshihiro (Nagoya, JP), Ohtani; Noboru (Handa, JP), Nakayama; Koichi (Chiryu, JP)

Assignee: Aisin Seiki Kabushiki Kaisha

International Classification: F04C 23/00 (20060101); F04B 003/00 (); F04B 005/00 (); F04B 025/00 ()

Expiration Date: 10/23/2018