FIELD: engines and pumps.
SUBSTANCE: pump comprises housing to accommodate pressure chamber, impeller with front and rear sides. Proposed system comprises one or several passages extending through impeller from front to rear. Note here that passage or every passage has first opening on rear side and second opening on front side of impeller. Proposed device comprises case with side nearby seal and side nearby impeller, and, at least, one passage extending from side nearby seal to that nearby impeller. Passage or every passage has inlet on side nearby seal, outlet on side nearby impeller, and bottom wall extending through case. Bottom wall has front tapered part on side nearby seal and tail tapered part nearby impeller. Said outlet communicated with first passage in installed impeller.
EFFECT: higher reliability.
17 cl, 5 dwg
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