Low flow-high pressure centrifugal pump

Abstract

Low flow centrifugal pump that develops more than 25 percent greater pressure than equivalent standard type spiral impellers with circular casings.

1 . A low flow centrifugal-regenerative pump having an impeller disk, said impeller disk having radial grooves on the face of said impeller disk and radial peripheral teeth on a peripheral edge of said impeller disk to increase pressure of fluid exiting said pump due to corkscrew circulation within a volute of said pump and a dam to push said liquid into a discharge nozzle in said pump. 
     
     
         2 . A low flow centrifugal-regenerative pump according to  claim 1  wherein said dam is a replaceable cutwater to increase developed pressure. 
     
     
         3 . A low flow centrifugal-regenerative pump according to  claim 2  wherein said replaceable cutwater Tater has a shape to provide optimal increase in performance of said pump. 
     
     
         4 . A low flow centrifugal-regenerative pump according to  claim 1  having a single entrance impeller with passages communicating with an entrance to said radial grooves to effect a double suction impeller. 
     
     
         5 . A pump impeller disk having radial grooves to reduce internal flow which results in less internal heat build up at low fluid flow through a pump fitted with said impeller.