Canned motor pump having concentric bearings
AssigneeEbara Corporation
InventorsMakoto Kobayashi, Masakazu Yamamoto, Yoshio Miyake, Koji Isemoto, Keita Uwai
Life of this patent
Estimating the term…
Abstract
A canned motor pump has relative small size and low output power for use in, for example, circulating warm water. The canned motor pump comprises a motor stator, a stator can disposed radially inwardly of the motor stator and in which a fluid passage of a main flow of a pumped fluid is defined, a rotatable shaft, a motor rotor fixedly supported on an end of the rotatable shaft and disposed radially inwardly of the stator can, a pump impeller mounted on an opposite end of the rotatable shaft, and all radial bearings for supporting the rotatable shaft disposed between the motor rotor and the pump impeller.
Claims12
A canned motor pump comprising:
- a motor stator;
- a stator can disposed radially inwardly of said motor stator;
- a rotatable shaft;
- a motor rotor fixedly supported on an end of said rotatable shaft and disposed radially inwardly of said stator can and around a portion of said rotatable shaft so as to form a fluid flow passage between said motor rotor and said portion of said rotatable shaft;
- at least one connecting portion connecting said rotor to said portion of said rotatable shaft in said fluid flow passage and forming a portion of substantially minimum cross section of said fluid flow passage;
- a pump impeller mounted on an opposite end of said rotatable shaft which pumps a fluid, substantially all of said fluid flowing through said fluid flow passage;
- and
- first and second radial bearings for supporting said rotatable shaft, said first and second radial bearings being concentric with each other and being axially disposed between said connecting portion passage and said pump impeller such that said first and second radial bearings are substantially axially offset from said at least one connecting portion.
Dependencies are inferred from the claim text.