Pressure compensation type sealing device at shaft extension position of oil pump of deep water turbine

The invention discloses a pressure compensation type sealing device at the shaft extension position of a deep water electric oil pump. The pressure compensation type sealing device comprises a motor shell, and an oil tank is installed on one side of the motor shell. Through the arrangement of the compensation hydraulic oil connector, hydraulic oil stored in an oil tank flows into the inner side of the connecting pipe through the compensation hydraulic oil connector, penetrates through the connecting pipe to enter the inner sides of the parallel pipe and the compensation opening, and then penetrates through the compensation opening to fill the inner side of the shell; and meanwhile, hydraulic oil can penetrate through the motor compensation interface through a parallel pipe to enter and fill the inner side of the motor shell, so that compensation pressure is introduced into the outer shell of the motor shell and the inner side of the pump shell, internal and external pressure balance of each shell is realized,