Liquid sealed pump
OwnerSidney T. Highnoteinventor
Life of this patent
Estimating the term…
Abstract
A pump for pumping a fluid includes a motor, a drive shaft, an impeller, a pump housing having an inlet and an outlet portion, and an extension tube extending between the motor and the pump housing. Preferably, a portion of the fluid to be pumped is contained within the extension tube at a relatively constant level to provide a seal.
Claims13
A pump for pumping a fluid comprising:
- a motor;
- an impeller;
- a drive shaft connected between the motor and the impeller;
- a pump housing comprising an inlet for delivering a pumped fluid to the impeller and an outlet for delivering the pumped fluid from the impeller;
- an extension tube extending between the motor and the pump housing;
- a sleeve through which the drive shaft extends, the sleeve being positioned within the extension tube, and having at least one weep hole allowing passage of a sealing fluid through the sleeve;
- a sealing fluid supply conduit for delivering the sealing fluid to the extension tube;
- and
- a sealing fluid return conduit for discharging the sealing fluid from the extension tube;
- wherein the sealing fluid is maintained within the extension tube at a level between the sealing fluid supply conduit and the sealing fluid return conduit.
A liquid sealed pump comprising a pump housing, an impeller, a shaft coupled to the impeller for rotationally driving the impeller, a shaft sleeve at least partially surrounding the shaft and allowing rotation of the shaft therein, an extension tube at least partially surrounding the shaft sleeve and defining an annular fluid containment chamber between the extension tube and the shaft sleeve, a main fluid supply conduit for supplying fluid to the pump housing, a main fluid return conduit for discharging fluid from the pump housing, a sealing fluid supply conduit for delivering a sealing fluid to the annular fluid containment chamber, and a sealing fluid return conduit for discharging the sealing fluid from the annular fluid containment chamber;
- wherein the shaft sleeve comprises at least one relief hole allowing fluid flow therethrough, and wherein a level of sealing fluid is maintained in the annular fluid containment chamber between the sealing fluid supply conduit and the sealing fluid return conduit.
Dependencies are inferred from the claim text.