Liquid sealed pump

摘要

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.

主权项

1. 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.