Pumps – Motor driven – Electric or magnetic motor
Patent
1996-01-02
1997-04-08
Gluck, Richard E.
Pumps
Motor driven
Electric or magnetic motor
4151701, 4151711, F04D 2908
Patent
active
056181680
ABSTRACT:
The present invention relating to a circulating pump for pressurizing and circulating fluid in a system such as a boiler has an object to provide a circulating pump having an improved shroud of an impeller and suction ring of a pump housing to thereby reduce power loss in a motor and leakage of high pressurized fluid. The circulating pump according to the present invention comprises a motor, an impeller and a pump housing. A motor shaft is supported rotatably and slidably in an axial direction of the motor shaft by a lower bush bearing and an upper bush bearing. A plurality of grooves are symmetrically formed on an annular flange about the center thereof. Each of the grooves is arranged along the theoretical streamline of a vortex flow which is made from the central end toward the outside of the annular flange under the action of centrifugal force occurring according to the rotation thereof. By the plural grooves, fluid that has flowed into the impeller through a clearance between the shroud and the suction ring is pressed outwardly.
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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