PUMP UNIT WITH CARTRIDGE TYPE END SEAL Russian patent published in 2019 - IPC F04D29/12 

FIELD: machine building.

SUBSTANCE: invention relates to machine building, namely, to sealing assemblies of rotors of pumps pumping toxic, aggressive explosive and fire hazardous liquids. Pump unit includes flow section housing, impeller installed on shaft, resting on bearings located in housing of bearings, cartridge end seal installed in chamber for its installation between said housings and fixed on housing of bearings. Cartridge-type end seal is installed between tight housing of flow section and bearing housing in chamber isolated from ambient medium and is fixed on bearing housing through sealing gasket. In flanges and sealing bodies and bearings there are channels connected to pipelines of supply and discharge of breech liquid through sealing gasket.

EFFECT: invention is aimed at providing possibility of protection against contamination and damage of external parts of seal and bearing support; improved mounting and testing conditions; providing reliable operation, increasing pump repairability; increased reliability of connection with system of pipelines of breech and coolant; allows to use seal of this type in semi-submersible pumps with dry column, and also helps to prevent emergencies.

1 cl, 2 dwg