IMPELLER OF INTERMEDIATE STAGE Russian patent published in 2009 - IPC F04D29/22 F04D29/16 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to centrifugal pump impellers. Impeller contains driving disk 1, cover disk 2 and located between them blades 3. Cover disk 2 is outfitted by additional sealing in the form of collar 4. Collar 4 is concentric to inner collar of main sealing 5. Additional collar 4 with main sealing 5 form discharging chamber 6. Relation of external diametre D₁ of additional sealing - collar 4 to external diametre D₀ of inner collar of main sealing 5 is equal 1.1÷1.3. Distance L from butt of collar 4 up to input butt of impeller is (0.06÷0.07)D₀. Depth l of chamber 6 is (0.045÷0.065)D₀.

EFFECT: invention provides efficiency increasing of sealing and improving of hydrodynamic properties of impeller.

3 cl, 1 dwg