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US 6,203,696 B1Granted
Fluid driven pumps and apparatus employing such pumps
OwnerColin Pearsoninventor
Life of this patent
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OwnerColin Pearsoninventor
Estimating the term…
A reverse osmosis or filtration system uses one or more hydraulic intensifiers (integrated motor and pump) to provide all the high pressure fluid to a semi-permeable membrane or filter, the intensifier being powered by the high pressure flushing flow leaving the membrane or filter uses, and by a pressurized inlet flow of fluid to be purified or filtered. The intensifier or pump comprises reciprocable means having a pair of first pressure surfaces and a pair of second pressure surfaces each bounding a respective first and second pressure chamber, control valve means to supply pressure fluid alternately to the chamber bounded by one of the first surfaces and to exhaust pressure fluid from the chamber bounded by the other of the first surfaces thereby causing the reciprocable means to reciprocate, fluid inlet and outlet valve means communicating with the chambers bounded by the second surfaces whereby the second surfaces pump fluid through the second chambers upon reciprocation of reciprocable means, the control valve means comprising a plurality of primary poppet valves each having a secondary bleed valve to reduce a force necessary to operate the valve.
A reverse osmosis or filtration system comprising a semi-permeable membrane or filter, a pump arranged to supply all high pressure fluid delivered to the membrane or filter, part of said fluid passing through the membrane or filter as purified or filtered fluid, the remainder of said fluid being a flow of return fluid, which is returned to the pump, the pump being powered only by the return fluid and by an inlet flow of pressurized fluid to be purified or filtered, the pump comprising reciprocable elements bounding a pair of first pressure chambers which alternately receive and exhaust return fluid via control valves to reciprocate the reciprocable elements between extremities of reciprocation, a pair of second chambers also bounded by the reciprocable elements and which alternately receive the pressurized inlet fluid and deliver fluid at high pressure to the semipermeable membrane or filter, the control valves operating at the extremities of reciprocation of the reciprocable elements and being subjected to the pressure of fluid in the first pressure chambers, and a bleed valve permitting limited flow past a said control valve to modify the pressure in a said first chamber whereby to control the timing of operation of the said control valve.
A fluid-operated pump comprising reciprocable elements having a pair of first pressure surfaces and a pair of second pressure surfaces each bounding a respective first and second pressure chamber, control valves to supply pressure fluid alternately to the chamber bounded by one of the first surfaces and to exhaust pressure fluid from the chamber bounded by the other of the first surfaces thereby causing the reciprocable elements to reciprocate, fluid inlet and outlet valves communicating with the chambers bounded by the second surfaces whereby the second surfaces pump fluid through the second chambers upon reciprocation of the reciprocable elements, a said control valve comprising a primary valve which is closed when subject to a predetermined pressure difference across it and a secondary bleed valve for selectively reducing the pressure difference across the primary valve, whereby the primary valves open sequentially at the extremities of reciprocation of the reciprocable elements.
A pump as claimed in 19 wherein two said control valves are in the common wall structure and comprise a movable element which is common to both valves.
A fluid operated pump comprising reciprocable elements bounding a pair of first pressure chambers which alternately receive and exhaust pressure fluid via control valves to reciprocate the reciprocable elements, a pair of second chambers also bounded by the reciprocable elements and which alternately receive inlet fluid and deliver output fluid at high pressure, the control valves operating at the extremities of reciprocation of the reciprocable elements and being subjected to the pressure of fluid in the first pressure chambers, and a bleed valve permitting limited flow past a said control valve to modify the pressure in a said first chamber whereby to control the timing of operation of the said control valve.
Dependencies are inferred from the claim text.