Multi-stage pump system

摘要

A multi-stage pump system for use in desalination systems including a first stage S1 providing low pressure for priming the system a second stage S2 that is in fluid communication with the first stage and is primed by the low pressure from the first stage. The second stage S2B includes at least one reciprocating piston 122, in an enclosing cylinder 121, 121A and is attached to the two second flexible inflatable bladders 123. The piston 122 will move up and down within the cylinder 121 121A relative to the movement of the two second stage flexible bladders 123 due to priming by the first stage affecting their buoyancy. The driving fluid then passes into a passage 130 and is expelled to an outlet and Stage three (S3) at higher pressure when the first reciprocating member 122 proceeds through a complete stroke.

主权项

1. A multi-stage pump system for use in desalination systems, the multi-stage pump system comprising:
a. a first stage providing a first fluid at a first pressure; and b. a second stage that is in fluid communication with the first stage and is primed by the first fluid from the first stage, the second stage including a first reciprocating member, an inlet for drawing a second fluid from a second fluid source when the first reciprocating member undergoes a stroke and an outlet for expelling the second fluid at a second pressure when the first reciprocating member proceeds through a complete stroke, the second pressure greater than the first pressure, wherein, the second stage further includes a flexible bladder submerged in the second fluid source and the first reciprocating member is movable in response to a change in buoyancy of the flexible bladder as it is at least partially inflated and deflated using the first fluid.