REVERSE-OSMOSIS PUMP

• US 3,825,122 A
• Filed: 06/11/1973
• Issued: 07/23/1974
• Est. Priority Date: 06/11/1973
• Status: Expired due to Term

• Current Assignee: Julian S. Taylor
• Original Assignee: Julian S. Taylor
• Inventors: Taylor, Julian S.
• Primary Examiner(s): Spear, Jr., Frank A.
• Assistant Examiner(s): Lander, Ferris H.
• Application Number:
  US05/369,034
• Time in Patent Office: 407 Days
• Field of Search: 417/323,390,401,404,264 210/321,500,137
• US Class Current: 210/134
• CPC Class Codes: B01D 2313/246 Energy recovery means
• CPC Class Codes: B01D 61/06 Energy recovery
• CPC Class Codes: F04B 9/113 reciprocating movement of the pumping members being obtained by a double-acting liquid motor

Abstract

A multiple stage pump comprising a main chamber, a booster chamber and a driving chamber each having a piston therein with the pistons interconnected by a common piston rod for reciprocating the pistons in unison. Main conduit means connects the main chamber with a fluid supply and the inlet of a reverseosmosis device. Second conduit means connects the fluid reject discharge port of the reverse-osmosis device with the booster chamber. Hydraulic pump means including a pressure compensated pump and hydraulic conduits connected with a hydraulic fluid reservoir is connected with the driving chamber. Control means actuated by the reciprocating action of the piston rod operates valve devices in the hydraulic conduits and second conduits to maintain a continuous flow of fluid, under a predetermined pressure, from the main chamber to the reverse-osmosis device.

Claims

1. A hydraulic pumping system, comprising:

a plurality of axially aligned cylinders forming a like plurality of pumping chambers each having inlet-outlet ports and each having a piston therein;

a piston rod common to all said cylinders and connected with each said piston for reciprocating said pistons in unison;

main conduit means connected for directly receiving the fluid pumped from one of said chambers;

a varying load device having an inlet connected to the main conduit means whereby a constant fluid pressure is established in the main conduit means, said load device having an outlet discharging a fluid stream under pressure proportionate to the fluid pressure established in said main conduit means;

second conduit means having a first valve device therein connecting the pressurized fluid stream with a second one of said chambers and for discharging said latter fluid after passing into and out of said second chamber;

hydraulic pump means;

hydraulic conduit means having a second valve device therein connecting said hydraulic pump means with a third one of said chambers; and

, valve control means connected with said valve devices and actuated by said piston rod as it approaches the end of its movement in respective directions for driving the pistons in said second and said third chambers in a reciprocating action.

2. The pumping system accordinG to claim 1 in which said hydraulic pump means includes:

a pressure compensated hydraulic pump for driving the piston in said third chamber and maintaining the fluid pressure in said main conduit means constant.

3. The pumping system according to claim 2 in which the first and second valve device each comprises:

a two-position valve.

4. The pumping system according to claim 3 in which one end portion of said piston rod projects beyond one end of said axially aligned cylinders and said valve control means includes:

a stop secured to said one end portion of said piston rod; and

, valve shifting means connected with each said two-position valve and actuated by said stop in response to longitudinal reciprocating movement of said piston rod for shifting said two-position valves in unison with each other.

5. The pumping system according to claim 2 in which said pressure compensated hydraulic pump is provided with a pressure output control responsive to the fluid pressure in said main conduit means.

6. The pumping system according to claim 2 in which said pressure compensated hydraulic pump is provided with a manually adjustable pressure output control.

7. In combination with a reverse-osmosis device including a container having an inlet opening for receiving a constant pressurized flow of supply fluid and having an outlet opening discharging a constant flow of reject fluid under pressure proportionate to the supply fluid pressure, the improvement comprising:

a plurality of axially aligned cylinders forming a like plurality of pumping chambers each having inlet-outlet ports and each having a piston therein;

a piston rod common to all of said cylinders and connected with each said piston for reciprocating said pistons in unison;

main conduit means connected for directly receiving the fluid pumped from one of said chambers;

second conduit means having a first valve device therein connecting the outlet opening of said container with a second one of said chambers and for discharging the reject fluid after passing into and out of said second chamber;

hydraulic pump means;

hydraulic conduit means having a second valve device therein connecting said hydraulic pump means with a third one of said chambers; and

, valve control means connected with said valve devices and actuated by said piston rod as it approaches the end of its movement in respective directions for driving the pistons in said second and third chambers in a reciprocating action.

8. The combination according to claim 7 in which said hydraulic pump means includes:

a pressure compensated pump responsive to the fluid pressure in said main conduit means for driving the piston in said third chamber and maintaining the fluid pressure in said main conduit means constant.

9. The combination according to claim 8 in which the first and second valve devices each comprises:

a two-position valve.

10. The combination according to claim 9 in which one end portion of said piston rod projects beyond one end of said axially aligned cylinders and said valve control means includes:

a stop secured to said one end portion of said piston rod; and

, valve shifting means connected with each said two-position valve and actuated by said stop in response to longitudinal reciprocating movement of said piston rod for shifting said two-position valves in unison with each other.