US Patent 11555509 Motorized pressure exchanger with a low-pressure centerbore

A rotary isobaric pressure exchanger (IPX) configured to exchange pressure between a first fluid and a second fluid. The rotary IPX includes a low-pressure port designed to output the first fluid under a first pressure. The rotary IPX further includes a rotor that is connected via a fluid flow path from the low-pressure port. The rotary IPX further includes a shaft routed through a centerbore formed by the rotary IPX. The rotary IPX forms a low-pressure passageway from the low-pressure port to the rotor. The rotary IPX further forms a fluid passageway between the low-pressure passageway and the centerbore. The rotary IPX further includes a motor connected to the shaft, the motor designed to rotate the shaft to drive the rotor.