| 摘要 |
A pump apparatus for pumping a fluid from an area of fluid accumulation, comprising an elongated housing having a substantially hollow interior divided into a plurality of zones including; i) a first zone to receive fluid expelled from the pump apparatus; ii) a second zone having an inlet for the ingress of said fluid into said second zone and an outlet for the discharge of said fluid into said first zone; iii) a third zone sealingly isolated from all other of said plurality of zones filled with a compressibl e fluid at a predetermined pressure; and iv) a fourth zone that can be selectively pressured up and pressured down by alternately adding and removing a substantially non-- compressible fluid thereto and therefrom; a first piston slidably and sealingly disposed in said second zone for reciprocal movement towards and away from said first zone; a second piston slidingly and sealingly disposed in said housing to separate said third and fourth zones; connecting means extending between said first and second pistons for reciprocation of said pistons in tandem; conduit means for the flow of said non--compressible fluid into and out of said fourth zone; and pump means in fluid communication with said conduit means actuatable to supply said non- compressible fluid into said fourth zoneat a pressure sufficient to overcome the pressure of said compressible fluid in said third zone thereby moving said first and second pistons in a direction which expels said fluid from said second zone into said first zo ne through said outlet, and then deactuatable to allow the pressure of said compressibl e fluid in said third zone to overcome the pressure of said non-compressible fluid in said fourth zone thereby moving said pistons in a direction which results in fluid from said area of accumulation being drawn into said second zone through said inlet thereinto.
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