A water filtration system (60, FIG. 2) wherein pressured feed water (water with impurities to be filtered out) passes downstream from an upstream end of a passage (66) through a filter arrangement (74) in the passage, to a filtrate storage region (82), during filtrate production. Pressured water, su
A water filtration system (60, FIG. 2) wherein pressured feed water (water with impurities to be filtered out) passes downstream from an upstream end of a passage (66) through a filter arrangement (74) in the passage, to a filtrate storage region (82), during filtrate production. Pressured water, such as at 50 psi (3 bars) from a tap water source (110), provides the pressured feed water during filtrate production, and also pressurizes the filtrate during backflushing. A filtrate pressurizing apparatus (90) includes a movable member or piston (92) that lies in a chamber (94), and that has a feed side (134) that is pressurized by tap water during a backflush and that has a filtrate side (132) that presses against filtrate, the feed side having a larger diameter (D2) than the filtrate side (D1) to produce an increased pressure during backflushing.
대표청구항▼
1. A method for operating a water filtering system that includes a feed input (62) that receives pressurized feed water from a pressured feed source (110) and that allows the pressured feed water to flow downstream through a passage (66) that holds a filter (72) to produce clean water, or filtrate (
1. A method for operating a water filtering system that includes a feed input (62) that receives pressurized feed water from a pressured feed source (110) and that allows the pressured feed water to flow downstream through a passage (66) that holds a filter (72) to produce clean water, or filtrate (85) during filtrate production and that retains some of the filtrate in a storage region (82), and that, during a backflush, applies pressure to filtrate in said storage region to flow filtrate upstream through the filter, wherein said system includes walls forming a confined volume (94) and a moveable member (92) in said confined volume, said moveable member having a downstream face, and with an upstream face (132) of said moveable member exposed to the pressure of filtrate in said storage region, wherein: during a backflush operation, stopping the flow of said feed fluid to said feed input (62) and applying pressured feed fluid from said source to said downstream face (134) of said moveable member, to move said moveable member against filtrate in said storage region;said step of applying feed fluid to said downstream face during a backflush operation includes applying said feed fluid to a downstream face of a rigid moveable member which has a downstream end periphery that is sealed to stationary walls of said confined volume around a first area and that has an upstream end periphery that is sealed to said stationary walls around a second area that is smaller than said first area, to thereby increase the backflush pressure applied to said filtrate in said storage region. 2. A water filtration system (60, 150) that includes a feed input (62) and walls forming a filtrate storage region (82), walls forming a passage (66) with an upstream end portion (65) connected to said feed input and a downstream end portion (83) connected to said filtrate storage region, a filter arrangement (72) lying in said passage and allowing only filtrate to flow through said passage to said storage region, comprising: a moveable member, or piston (92) that lies in a container (94), said piston having an upstream face (132) forming a wall of said storage region and having a downstream face (134) forming a container wall;a feed water supply (110, 174) that supplies feed water at a pressure on the order of magnitude of 50 psi;a valve arrangement (118) that connects said feed water supply to said feed input (62) during filtrate production to flow feed water into said passage upstream end portion (65) and through said filter arrangement to move the piston downstream (D) and store filtrate against said piston upstream face (132), said valve arrangement coupling said feed water supply to said piston downstream face (134) during a backflush to push said piston upstream (U) and thereby force said filtrate in reverse through said filter arrangement;said feed water supply includes pressure-enhancing means (90, 151) that pressurizes filtrate during a backflush, at a pressure greater than the pressure of said feed water supplied by said feed water supply to said passage upstream end portion during filtrate production. 3. The system described in claim 2 wherein: said piston has upstream and downstream faces with said downstream face (134) sealed to said container at a second diameter (D2) and with said upstream face (132) sealed to said container at a first diameter (D1) that is smaller than said second diameter, said piston downstream face (134) being exposed to said pressured feed fluid over said second diameter and said piston upstream face (132) being exposed to filtrate in said filtrate storage region over said first diameter. 4. A water filtration system with walls forming a passage (66) having upstream and downstream end portions (65, 83), a filter arrangement (72) lying in said passage and positioned to filter water passing between said end portions to produce filtrate (85) during filtrate production, a pressured feed water supply (110) coupled to said passage upstream end portion to supply pressured feed water to be filtered thereto during feed water movement through said filter arrangement in said passage and produce filtrate, walls forming a filtrate storage region (82) coupled to said passage downstream portion for accumulating filtrate, and a filtrate pressurizing apparatus (90) coupled said filtrate storage region for pressurizing said filtrate to backwash said filter arrangement, wherein: said filtrate pressurizing apparatus includes walls forming a container (94), a moveable member (92, 152) lying in said container and having an upstream side (132) exposed to said filtrate and a downstream side, and a valve arrangement that controls the flow of feed water from said pressured feed supply;said valve arrangement is operable during a backflush to stop the flow of feed water from said supply into said passage upstream end portion (65) while allowing feed water to flow into said container (94) against said downstream side of said movable member, to push said movable member upstream and force the flow of said filtrate upstream through said passage and said filter arrangement, while connecting said passage upstream portion to a drain (121);said system includes pressure-enhancing means that pressurizes filtrate at said filtrate side (132) of said moveable member during a backflush, at a pressure greater than the pressure of said pressured feed water supplied by said supply to said downstream side (132) of said moveable member. 5. The system described in claim 4 wherein: said moveable member has upstream and downstream end portions with said upstream end portion sealed -to said container at a first diameter and with said downstream end portion sealed to said container at a second diameter that is larger than said first diameter, said moveable member being exposed to said pressured feed fluid over said second diameter and said moveable member being exposed to filtrate in said passage downstream end portion over said first diameter.
Harris, Jordan; Rogers, Roo; Behar, Yves; Morenstein, Joshua; Beaulieu, Serge; Olson, Jennifer, Bottle with an integrated filtration assembly that is manually operated using a plunger.
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