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Abstract

A pressure exchanger for transferring pressure from a higher pressure liquid in a first liquid system to a lower pressure liquid in a second liquid system having a housing (8) with inlet and outlet connection openings (10-10.3) for each liquid and a rotor (1) arranged in the housing for rotation about a longitudinal axis. The rotor has a plurality of through channels (13) arranged around the longitudinal axis with openings (12) on axial end faces (2, 3) of the rotor. The rotor channels (13) are connected to the connection openings (10-10.3) through flow openings (11-11.3) in the housing such that during rotation of the rotor high pressure liquid and low pressure liquid are alternately supplied to the respective systems. A predominantly axially extending flow transition is formed between the flow openings (11-11.3) in the housing and the openings (12) of the rotor channels (13), and the flow openings in the housing form part of curved cavities (19) with each cavity (19) simultaneously covering several rotor channel openings (12) and having a shape which equilibrates the liquid flow speed in the vicinity of the housing flow openings (11-11.3). External surfaces (5-5.3) of the rotor (1) have an energy converting or energy transmitting configuration (6), and a partial flow (TS) of high pressure and/or flow energy impinging on the configuration (6) produces rotation of the rotor (1). A regulator (7) the varies the amount of the partial flow (TS) and the rotational speed of the rotor (1) and controls the rotational speed of the rotor for substantially shock-free admission of the mass flow into the rotor channels (13).

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