PERFECTED SEAL OF ELECTRICALLY DRIVEN BOREHOLE PUMP Russian patent published in 2014 - IPC F04D13/10 H02K5/12 

FIELD: engines and pumps.

SUBSTANCE: set of inventions relates to borehole pumps and to seal assembly used with pump drive motors. Seal assembly arranged between motor and pump of the borehole electrically driven pump unit comprises housing with chamber, its bottom being communicated with said motor and its top with said pump. Said assembly comprises inlet connected with said chamber and housing outer chamber, communication opening connected with motor fluid chamber, top and bottom channels for motor shaft ends to be fitted therein. It has communication pipe its bottom end being connected with said communication opening and its top end extending into the housing. Bellows is arranged inside the housing to receive the communication pie top end for fluid passage. This assembly has top and bottom seal elements arranged inside top and bottom axial channels to seal boundaries between top and bottom channels and drive shaft.

EFFECT: longer life, ruled out ingress of harmful matters in engine.

7 cl, 2 dwg