Patent ID: 7214315

Claim:
A pressure exchange device for the transfer of a fluid comprising: a high pressure boost unit comprising; a high pressure conduit in fluid communication with an impeller, said impeller configured to raise the pressure of a fluid received through a high pressure inlet port; a low pressure conduit in fluid communication with a low pressure fluid source; a pressure exchange unit comprising; a spinning rotor having a first and second conduit running therethrough; wherein said first and second conduit intermittently and opposingly align with said high pressure conduit and said low pressure conduit as said rotor spins; a shaft running coaxially through said pressure exchange device, said shaft being further connected to said rotor and said impeller; a motive force attached to said shaft; wherein said pressure exchange unit further comprises a housing having a low pressure inlet located at a first distal end of said housing and a low pressure outlet located a second distal end of said housing, wherein said low pressure outlet is in alignment with said low pressure inlet, said housing further comprising a high pressure inlet located at said second distal end of said housing and a high pressure outlet located at said first distal end of said housing, wherein said high pressure inlet is in alignment with said high pressure outlet; a left rotor rotatably mounted inside said housing, said left rotor having a first low pressure conduit and a first high pressure conduit therethrough, said conduits configured to align with said high pressure outlet and said low pressure inlet in succession as said left rotor rotates; a right rotor, coaxially aligned and offset from said left rotor, rotatably mounted inside said housing, said right rotor having a second low pressure conduit and a second high pressure conduit therethrough, said conduits being configured to align with said high pressure inlet and said low pressure outlet in succession as said right rotor rotates; a first tube sealing placed intermediate said left rotor and said right rotor configured to communicate fluid between said first low pressure conduit and said second low pressure conduit; a second tube, sealingly placed intermediate said left rotor and said right rotor configured to communicate fluid between said first high pressure conduit and said second high pressure conduit; a spring disposed between said left rotor and said right rotor, said spring configured to bias said left and right rotor apart from each other thereby maintain light contact with a said housing; a pressurized fluid internal to said housing, said pressurized fluid acting to maintain sealing contact between said left rotor and said right rotor and a respective sealing surface of said housing.