Rotary control valve for reverse osmosis feed water pump with energy recovery
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04B-007/00
F04B-009/113
C02F-001/44
출원번호
US-0693743
(2012-12-04)
등록번호
US-9897080
(2018-02-20)
발명자
/ 주소
Marschke, Dean David
출원인 / 주소
GENERAL ELECTRIC COMPANY
인용정보
피인용 횟수 :
0인용 특허 :
57
초록▼
A liquid pumping system includes at least two water cylinders that are each controlled by a hydraulic piston. A rotary valve controls the hydraulic pistons. The rotary valve has an inner unit that rotates within an outer unit. Slots provided between the inner and outer units control the duration, ra
A liquid pumping system includes at least two water cylinders that are each controlled by a hydraulic piston. A rotary valve controls the hydraulic pistons. The rotary valve has an inner unit that rotates within an outer unit. Slots provided between the inner and outer units control the duration, rate and direction of hydraulic fluid supply to the hydraulic piston. A liquid pumping process comprises distributing an initial flow of pressurized hydraulic fluid between the hydraulic cylinders. The hydraulic cylinders move through a cycle in a phased relationship to provide a constant sum of flow rates from the liquid pumps. In a water treating process, feed water is pumped through the membrane unit. Brine from the membrane unit is returned to each liquid pump while that liquid pump is feeding water to the membrane unit.
대표청구항▼
1. A rotary control valve comprising: a rotatable unit configured to rotate about a longitudinal axis;a stationary unit;a fluid supply input and a fluid return output;a plurality of fluid ports; and,a plurality of pairs of sequence slots positioned on one of the rotatable unit and the stationary uni
1. A rotary control valve comprising: a rotatable unit configured to rotate about a longitudinal axis;a stationary unit;a fluid supply input and a fluid return output;a plurality of fluid ports; and,a plurality of pairs of sequence slots positioned on one of the rotatable unit and the stationary unit, each sequence slot comprising a supply sequence slot and a return sequence slot extending partially around a circumference of one of the rotatable unit and the stationary unit without overlapping, wherein, the supply sequence slot is part of a supply fluid communication path from the fluid supply input to one of the fluid ports, andthe return sequence slot is part of a return fluid communication path from the fluid return output to the same one of the fluid ports, wherein the rotatable unit is rotatable with respect to the stationary unit to open and close the supply fluid communication path and the return communication path of each of the plurality of pairs of sequence slots, whereby each pair of sequence slots alternatively completes the supply fluid communication path and the return fluid communication path when the rotatable unit is rotated, and wherein the plurality of pairs of sequence slots comprises a number of identical pairs of sequence slots radially offset from each other by 360 degrees divided by the number, each identical pair of sequence slots corresponding to a hydraulic cylinder. 2. The rotary control valve of claim 1, wherein the rotatable unit is an inner valve unit, the stationary unit is an outer valve unit and the inner valve unit is housed within the outer valve unit. 3. The rotary control valve of claim 2, wherein the plurality of pairs of sequence slots is positioned on an outer surface of the inner valve unit. 4. The rotary control valve of claim 2, wherein the plurality of pairs of sequence slots is positioned on an inner surface of the outer valve unit. 5. The rotary control valve of claim 1, wherein the rotatable unit is an outer valve unit and the stationary unit is an inner valve unit housed within the outer valve unit. 6. The rotary control valve of claim 5, wherein the plurality of pairs of sequence slots is positioned on an outer surface of the inner valve unit. 7. The rotary control valve of claim 5, wherein the plurality of pairs of sequence slots is positioned on an inner surface of the outer valve unit. 8. The rotary control valve of claim 1, wherein each sequence slot of the plurality of sequence slots comprises a leading edge, an intermediate segment and a trailing edge and wherein the at least some of the leading edge and the trailing edge have a smaller cross-sectional flow area than the intermediate segment. 9. The rotary control valve of claim 8, wherein the cross-sectional flow area of the intermediate segment is constant. 10. The rotary control valve of claim 1, wherein the plurality of pairs of sequence slots are circumferentially staggered relative to the longitudinal axis so that the communication paths from the fluid input to each fluid output open in a phased manner. 11. A liquid pumping system comprising, a plurality of liquid pumps;a plurality of hydraulic cylinders, wherein each liquid pump is connected to a different hydraulic cylinder;one or more rotary control valves connected to the plurality of hydraulic cylinders; and,a hydraulic pump connected to the rotary control valve, wherein each of the one or more rotary control valves comprises:a rotatable unit configured to rotate about a longitudinal axis;a stationary unit;a fluid supply input and a fluid return output, the fluid supply input connected to the hydraulic pump to supply hydraulic fluid from the hydraulic pump to the rotary control value, and the fluid return output connected to the hydraulic pump to return hydraulic fluid from the rotary valve to the hydraulic pump;a plurality of fluid ports, each fluid port connected to one of the plurality of hydraulic cylinders; and,a plurality of pairs of sequence slots positioned on one of the rotatable unit and the stationary unit, each sequence slot comprising a supply sequence slot and a return sequence slot extending partially around a circumference of one of the rotatable unit and the stationary unit without overlapping, wherein, the supply sequence slot is part of a supply fluid communication path from the fluid supply input to one of the fluid ports, andthe return sequence slot is part of a return fluid communication path from the fluid return output to the same one of the fluid ports, wherein the rotatable unit is rotatable with respect to the stationary unit to open and close the supply fluid communication path and the return communication path of each of the plurality of pairs of sequence slots, whereby each pair of sequence slots alternatively provides a supply and return of fluid to an aligned port and thereby to the hydraulic cylinder connected to the aligned port, and wherein the plurality of pairs of sequence slots are arranged so that each of the hydraulic cylinders follows the same velocity profile but phased relative to each other by 360 degrees divided by the number of hydraulic cylinders such that the total liquid flow produced from the liquid pumps is constant over a period of time in which the hydraulic pump produces a constant output. 12. The liquid pumping system of claim 11, wherein each liquid pump comprises one or more pistons. 13. The liquid pumping system of claim 12, wherein the one or more pistons are adapted to pump liquid on both a forward and a return stroke. 14. The liquid pumping system of claim 13, wherein the one or more pistons further comprise a piston rod and the piston rod comprises a set of shock absorbers that are positioned on the piston rod to generate a resistive force when the one or more pistons approach an end of the forward stroke and an end of the return stroke, each shock absorbers comprising a wall with holes separating a chamber from a reservoir, the holes adapted to generate a resistive force as fluid is forced from the chamber to the reservoir. 15. The system of claim 11, further comprising a membrane unit in fluid communication with the plurality of liquid pumps.
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