Patent ID: 6086331
Filing Date: 2000-07-11
Classification: F04D,H02K

Abstract:
A safety pumping system, which includes a pump and an electric motor, and which is adapted to be immersed in a fluid contained in a tank, said system comprising:a motor housing defining an inner space containing the electric motor,an outer shell or jacket defining an outer space surrounding the housing of the motor,a driving shaft interconnecting the electric motor and the pump,first gas supply means for supplying protective gas into the outer space at a pressure exceeding the atmospheric pressure, so as to fill the outer space with such gas, andsecond gas supply means for supplying protective gas into the inner space of the motor housing so as to displace oxygen therefrom and fill the space with protective gas in order to counteract explosions, the second gas supply means being adapted to maintain the protective gas in the inner space at a pressure which is equal to or exceeds that of the gas pressure in the outer space.