SEALING OF SHAFT OF TURBINE PUMP UNIT (VERSIONS) Russian patent published in 2016 - IPC F16J15/42 

FIELD: machine building.

SUBSTANCE: under suggested invention is shaft seal of the turbine pump unit containing impeller, located between pump and turbine installed on shaft, the smooth side of the impeller is connected with blade side of the impeller using the bypass holes, made in its disk; holes connecting smooth and blade sides of the impeller are displaced from the axis of symmetry of between blades channel along the rotor rotation direction; in the pump casing between the smooth side of the impeller and pump the ribs are made; between the blade side of the impeller and turbine additional seal is made; in the turbine casing between the turbine and blade side of the impeller the by-pass holes are made with output to the blade side of the impeller; and in case between the smooth side of the impeller and pump the ribs are made.

EFFECT: exclusion of liquid boiling in seal, minimization of pump leaks to turbine during cooldown.

6 cl, 5 dwg