Submersible motor-pump assembly

Claim 1

A submersible motor pump comprising: a reservoir casing which is adapted to contain a hydraulic fluid; a pump of the type having a housing with a fluid intake and a fluid outlet; means mounting the pump in the casing with the fluid intake of the pump positioned for intaking said hydraulic fluid from within the casing; conduit means connected to the outlet of the pump and extending through said casing for discharging the hydraulic fluid exterior the casing; said casing having means for equalizing the pressure within the casing with respect to ambient pressure, the equalizing means including: said casing having a port opening to ambient; and a bladder for containing the liquid media, said bladder being mounted in the casing so that ambient pressurE is applied to the exterior of the bladder; said casing having an annular interior recess adjacent the exterior of the bladder for providing a space for containing sea water therebetween; said casing having a cap mounted at each end thereof; said conduit means extending the pump outlet through one of the caps; said casing being generally cylindrical; said bladder being generally tubular; means for sealing the ends of the bladder within the casing; an electric motor of the type having a housing; said electric motor being mounted in one end portion of the cylindrical casing and the pump being mounted in the other end of the portion; means drivingly connecting the pump to the electric motor; the electric motor end portion of the casing having a hydraulic fluid inlet for receiving fluid to the assembly; the assembly spaces for the motor, driving means, and pump being in liquid communication with one another so that received fluid will first cool the motor and then supply the pump; a plate transversely mounted within the casing for supporting the pump; a combination mount disposed within the casing for supporting the pump plate and the electric motor; the connecting means between the electric motor and the pump being located within the combination mount; a removable end plate transversely mounted within the casing and spaced from one of the electric motor plates; said electric motor having brushes which are mounted on the end plate and located within the space between the end plate and said one of the electric motor plates; and pin and socket means connecting the brushes to the electric motor.