aluminum submersible electric pump (hereinafter referred to as electric pump) is composed of water pump, seal and motor. The electric pump is equipped with a protective device. The motor is located at the upper part of the electric pump. It is a single-phase or three-phase asynchronous motor. The water pump is located at the lower part of the motor. It is a centrifugal impeller with a volute structure. Double-end mechanical seals are used between the water pump and the motor. "O" type oil-resistant rubber seals are used as static seals at each fixed stop seal.