A variable wash flow filter assembly includes guide that is operable to guide a wash velocity control cone between a minimal position and a maximum position. The guide defines at least one activation deltaP window downstream of a conical gap between the wash velocity control cone and a frusto-conica
A variable wash flow filter assembly includes guide that is operable to guide a wash velocity control cone between a minimal position and a maximum position. The guide defines at least one activation deltaP window downstream of a conical gap between the wash velocity control cone and a frusto-conical wash filter. The fuel flow through the conical gap and the activation deltaP window is operable to position the wash velocity control cone between the minimal position and maximum position to selectively split a fuel flow through an inlet into a burn flow through a thru flow port and a filtered flow thru the frusto-conical wash filter and filtered flow port.
대표청구항▼
1. A variable wash flow filter assembly comprising: a housing which defines an inlet along a longitudinal axis, at least one filtered flow port, and at least one thru flow port;a frusto-conical wash filter axially fixed within said housing adjacent to said at least one filtered flow port;a wash velo
1. A variable wash flow filter assembly comprising: a housing which defines an inlet along a longitudinal axis, at least one filtered flow port, and at least one thru flow port;a frusto-conical wash filter axially fixed within said housing adjacent to said at least one filtered flow port;a wash velocity control cone movable between a minimal position and a maximum position relative to said axially fixed wash filter; anda guide operable to guide said wash velocity control cone along said longitudinal axis between said minimal position and said maximum position, said guide defines at least one activation deltaP window downstream of a conical gap between said wash velocity control cone and said frusto-conical wash filter, the fuel flow through said conical gap and said at least one activation deltaP window operable to position said wash velocity control cone between said minimal position and said maximum position to selectively split a fuel flow through said inlet into a burn flow through said thru flow port and a filtered flow thru said frusto-conical wash filter and filtered flow port, and wherein said conical gap and, said at least one deltaP window provides a differential pressure between an outside of said wash velocity control cone and an inside of said wash velocity control cone. 2. The variable wash flow filter assembly as recited in claim 1, wherein said at least one filtered flow port is transverse to said longitudinal axis of said housing. 3. The variable wash flow filter assembly as recited in claim 1, wherein said at least one thru flow port is transverse to said longitudinal axis of said housing. 4. The variable wash flow filter assembly as recited in claim 1, further comprising a bias member within said wash velocity control cone to bias said wash velocity control cone relative to said housing. 5. The variable wash flow filter assembly as recited in claim 1, wherein said conical gap is defined around said longitudinal axis. 6. The variable wash flow filter assembly as recited in claim 1, wherein said guide is a cylindrical member with said at least one activation deltaP window. 7. The variable wash flow filter assembly as recited in claim 1, wherein said wash velocity control cone is movable at least partially into said guide along said longitudinal axis at said maximum position. 8. The variable wash flow filter assembly as recited in claim 1, further comprising a spring seat mounted to said guide to support a bias member to bias said wash velocity control cone. 9. The variable wash flow filter assembly as recited in claim 1, wherein flow through the deltaP window controls cone position. 10. The variable wash flow filter assembly as recited in claim 9, wherein the deltaP window is configured to optimize deltaP for various flow conditions to control cone position. 11. A variable wash flow filter assembly comprising: a housing which defines an inlet along a longitudinal axis, at least one filtered flow port, and at least one thru flow port;a frusto-conical wash filter axially fixed within said housing adjacent to said at least one filtered flow port;a wash velocity control cone movable between a minimal position and a maximum position relative to said axially fixed wash filter; anda guide operable to guide said wash velocity control cone along said longitudinal axis between said minimal position and said maximum position, said guide defines at least one activation deltaP window downstream of a conical gap between said wash velocity control cone and said frusto-conical wash filter, the fuel flow through said conical gap and said at least one activation deltaP window operable to position said wash velocity control cone between said minimal position and said maximum position to selectively split a fuel flow through said inlet into a burn flow through said thru flow port and a filtered flow thru said frusto-conical wash filter and filtered flow port, and wherein said at least one activation deltaP window is operable to provide a net positive opening force to said wash velocity control cone. 12. A method of filtering a fuel flow comprising: positioning an axially movable wash velocity control cone relative to an axially fixed wash filter and an axially fixed guide with at least one activation deltaP window downstream of a conical gap between the axially movable wash velocity control cone and the wash filter, the wash velocity control cone movable between a minimal position and a maximum position to split a fuel flow into a burn flow through the conical gap and the at least one activation deltaP window, and a filtered flow through the axially fixed wash filter, the fuel flow through the conical gap and the at least one activation deltaP window operable to position the wash velocity control cone between the minimal position and said maximum position, the burn flow operable as a wash flow to carry away contaminate trapped by the wash filter, and including contouring the at least one deltaP window to provide a net positive opening force to the wash velocity control cone. 13. The method as recited in claim 12, further comprising: mounting the variable wash flow filter assembly to an outlet of a fuel pump. 14. The method as recited in claim 12, further comprising: stroking the wash velocity control cone against a bias member to settle at a position to maintain the wash velocity within a desired range. 15. The method as recited in claim 12, further comprising biasing the wash velocity control cone. 16. The method as recited in claim 12, wherein axial movement of the wash velocity control cone varies the conical gap. 17. The method as recited in claim 12, wherein axial movement of the wash velocity control cone selectively changes a flow passage for the burn flow through the deltaP window. 18. The method as recited in claim 12, wherein flow through the deltaP window controls cone position. 19. The method as recited in claim 18, wherein the deltaP window is configured to optimize deltaP for various flow conditions to control cone position.
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