Self-priming centrifugal pump

摘要

A self-priming centrifugal pump having suction and separation chambers defined within a casing, and a rotatable impeller positioned in a volute for transferring fluid from the suction chamber to the separation chamber. Reprime lift capability and priming rate are substantially improved by an elbow-shaped priming passage communicating the lower region of the separation chamber with the lower region of the volute, and by an upstanding ramp-like shoulder formed in the volute below the impeller. The improved priming passage configuration and the ramp-like shoulder are believed to effect a more efficient delivery of fluid from the separation chamber to the impeller during pump priming, and to effect a more turbulent mixing in the impeller of fluid with air from the suction chamber whereby air is efficiently entrained in the exhausted fluid and the pump is rapidly reprimed.