Submersible pump stage

Abstract

A submersible pump stage comprises an impeller comprising a first front top disc and a first rear top disc, first blades located between the front and the rear top discs, a bushing and a diffuser comprising a second front top disc and a second rear top disc, second blades located between the second front and second rear top discs. The second rear top disc has through holes passing in end surfaces and located circumferentially. A number of the through holes is selected at least equal to a number of interblade channels. The holes are made so as to provide an overflow of a liquid from a front pocket of this stage of the submersible pump into each interblade channel of a preceding stage diffuser.

1 . A stage of a submersible pump comprising:
 an impeller comprising a first front top disc and a first rear top discs, first blades located between the first front top disc and the first rear top disc,   a bushing,
 a diffuser comprising a second front top disc and a second rear top disc, the second blades located between the second front top disc and the second rear top disc, the second rear top disc having through holes passing in end surfaces and located circumferentially, a number of the through holes is at least equal to a number of interblade channels and the through holes are made to provide an overflow of a liquid from a front pocket of this stage of the submersible pump into each interblade channel of a diffuser of a preceding stage of the submersible pump. 
   
     
     
         2 . The stage of  claim 1  wherein the number of the through holes is selected divisible by the number of the interblade channels. 
     
     
         3 . The stage of  claim 1  wherein a diameter each through hole is selected within the range 1-10 mm. 
     
     
         4 . The stage of  claim 3  wherein the diameter of each through hole is selected within the range 2-4 mm.