ELECTRO-MAGNETIC UNLOADING DEVICE OF MAIN CIRCULATION PUMP UNIT Russian patent published in 2010 - IPC F04D29/41 

FIELD: machine building.

SUBSTANCE: unloading device consists of unloading disk secured on shaft of blade pump, of immobile electro-magnet wherein at least one circular electric coil is located in circular cavity of magnetic conductor and of electro-magnet cooler cooled with running water. The cooler is made on external side surface of the magnetic conductor by means of a detachable connection. The magnetic conductor is equipped with at least one channel running from space surrounding the pump into a cavity adjacent to internal side surface of the magnetic conductor and the electro-magnet forming air flow in a circuit created with the said channels, with the cavity and the gap with exit beyond boundaries of the pump.

EFFECT: raised reliability of unit due to elimination of direct contact of electric coils and cooler of electro-magnet and due to prevention of cooler moisture effect onto coils.

6 cl, 2 dwg