Pumps – Motor driven – Electric or magnetic motor
Patent
1996-01-02
1997-03-25
Gluck, Richard E.
Pumps
Motor driven
Electric or magnetic motor
4151701, F04D 2908
Patent
active
056138458
ABSTRACT:
The present invention is relating to a circulating pump for pressurizing and circulating fluid in a system such as a boiler. An object of the present invention is to provide a circulating pump with a sub-impeller wherein a separate sub-impeller is provided below an impeller for moderating resistance occurring at the impeller due to pressure difference between an impeller chamber and an inside of the impeller during an operation of a pump so that power loss is prevented during a motor driving and a substance such as mud is prevented from entering a stator can. The circulating pump with a sub-impeller comprises a motor, an impeller and a pump housing. Below the impeller body, a sub-impeller with a plurality of radial baldes is provided. The sub-impeller forces out pressurized fluid that has flowed below the impeller back from below the impeller radially while rotating. According to this, pressure difference between an impeller chamber and an inside of the impeller which makes the impeller rise toward a suction ring is reduced. Thus, loss of power consumed for overcoming the pressure difference is also reduced.
REFERENCES:
patent: 2911918 (1959-11-01), Reed
patent: 3478689 (1969-01-01), Ball
patent: 4321009 (1982-03-01), Fuji et al.
patent: 5156535 (1992-10-01), Budris et al.
patent: 5209635 (1993-05-01), Stewart et al.
Daewoo Electronics Co. Ltd.
Gluck Richard E.
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