Patent ID: 7815421

Claim:
A pressure exchanger for transferring pressure energy from a high pressure liquid of a first liquid system to a low pressure liquid of a second liquid system, comprising: a housing with inlet and outlet connection openings for each liquid, and a rotor arranged in the housing to rotate about a longitudinal axis, the rotor having a plurality of continuous rotor channels extending axially and having openings on each rotor end face arranged around the longitudinal axis of the rotor with the rotor channels communicating through flow openings formed in the housing with the connection openings of the housing such that during the rotation of the rotor the rotor channels alternately carry high pressure liquid and low pressure liquid from the respective first and second liquid systems, wherein oncoming liquid flow from the flow openings formed in the housing to the rotor channels exerts a circumferential force component on the rotor that drives the rotor, wherein flow guiding shapes in the form of channel contours that deflect the rotor channel flow are arranged in the inlet areas of the rotor channels starting at or downstream from the channel openings, and wherein the flow guiding shapes arranged in the inlet areas of the rotor channels are constructed as channel contours that ensure uniform homogeneous velocity profiles in the rotor channels, each of said channel contours having a section with an axis not parallel to said longitudinal axis, each section in the inlet areas being deflected in a direction of rotation of the rotor.