Rotating separator with housing preventing separated liquid carryover

1. A rotating separator for separating liquid from a fluid mixture, the rotating separator comprising:

a separator assembly comprising a housing and an annular rotating separating filter element rotating about an axis extending along an axial direction in said housing, said annular rotating separating filter element having an inner periphery defining a hollow interior, and having an outer periphery, said housing having a sidewall with an inner surface facing said outer periphery of said annular rotating separating filter element and spaced along a radial direction radially outwardly of said annular rotating separating filter element by a plenum therebetween, said housing having an inlet for supplying said mixture to said hollow interior, said housing having an outlet delivering a separated component of said mixture from said plenum, said housing having a drain delivering separated liquid from said plenum, the direction of flow through said annular rotating separating filter element being inside-out from said hollow interior through said annular rotating separating filter element to said plenum, said plenum having one or more flow path separating guides minimizing the flow of separated liquid to said outlet, said one or more flow path separating guides comprising one or more fins extending into said plenum from said inner surface of said sidewall of said housing, wherein said fins are tilted into the flow path of liquid extending from said annular rotating separating filter element such that said one or more fins are pointing in a direction opposite to the direction of rotation of said annular rotating separating filter element.

2. The rotating separator according to claim 1 wherein said one or more flow path separating guides guide said separated liquid toward said drain.

3. The rotating separator according to claim 1 wherein said fins are arcuately spaced from each other along said inner surface of said sidewall of said housing.

4. The rotating separator according to claim 1 wherein said fins create capture grooves catching said liquid.

5. The rotating separator according to claim 1 wherein each said fin extends from a root end at said inner surface of said sidewall of said housing to a distal tip end in said plenum pointing in said direction opposite to the direction of rotation of said annular rotating separating filter element such that said fin and said inner surface of said sidewall of said housing form a wedge-shape cavity catching separated liquid.

6. The rotating separator according to claim 5 wherein said fins extend obliquely relative to said radial direction.

7. The rotating separator according to claim 1 wherein said one or more fins define one or more guide surfaces guiding separated liquid along a drain direction towards said drain.

8. The rotating separator according to claim 7 wherein said drain direction is normal to said radial direction.

9. The rotating separator according to claim 7 wherein said drain direction is tangential to said radial direction.

10. The rotating separator according to claim 9 wherein said one or more fins wind helically toward said drain.

11. The rotating separator according to claim 10 wherein said one or more helically wound fins have one or more axially extending slots formed therethrough for gravitational drainage of separated liquid through the respective slot.

12. The rotating separator according to claim 1 wherein said sidewall of said housing tapers away from said axis of rotation.

13. The rotating separator according to claim 12 wherein said plenum has an upper portion and a lower portion, said lower portion being gravitationally below said upper portion, said sidewall of said housing tapers away from said annular rotating separating filter element as said sidewall extends from said upper portion of said plenum toward said lower portion of said plenum, and said one or more flow path separating guides comprise one or more fins creating greater swirl in said plenum closer to said upper portion of said plenum and lesser swirl in said plenum closer to said lower portion of said plenum, to aid drainage of separated liquid toward said lower portion of said plenum and away from said upper portion of said plenum, and less entrainment of separated liquid in said swirl.

14. The rotating separator according to claim 1 wherein said one or more flow path separating guides are configured to create a tortuous path in said plenum.

15. The rotating separator according to claim 14 wherein said one or more flow path separating guides comprise at least one swirl flow damper in said plenum.

16. The rotating separator according to claim 15 wherein said plenum has an upper portion and a lower portion, said lower portion being gravitationally below said upper portion, and wherein said swirl flow damper is at said upper portion of said plenum.

17. The rotating separator according to claim 15 comprising a plurality of said swirl flow dampers in said plenum.

18. The rotating separator according to claim 15 wherein said swirl flow damper is adjacent said inner surface of said sidewall of said housing.

19. The rotating separator according to claim 15 wherein said swirl flow damper is upstream of said outlet.

20. The rotating separator according to claim 15 wherein said swirl flow damper includes a vortex tube.

21. The rotating separator according to claim 14 wherein said one or more flow path separating guides are configured to break down secondary flow in said plenum and create low shear recirculation zones for collection of separated liquid.

22. The rotating separator according to claim 1 wherein said one or more flow path separating guides are liquid-phobic.

23. The rotating separator according to claim 22 wherein said one or more flow path separating guides are oleophobic.

24. The rotating separator according to claim 1 , wherein said inner surface of said sidewall includes a media layer.

25. The rotating separator according to claim 24 wherein said media layer comprises at least one fibrous media layer.

26. The rotating separator according to claim 24 wherein said media layer comprises at least one non-woven fibrous media layer.

27. The rotating separator according to claim 24 wherein said media layer comprises at least one woven screen.

28. The rotating separator according to claim 24 wherein said media layer comprises at least one wire mesh layer.

29. The rotating separator according to claim 24 wherein said media layer comprises a restrictive wrap.

30. The rotating separator according to claim 1 wherein said configured inner surface of said sidewall of said housing is liquid-philic.

31. The rotating separator according to claim 24 wherein said media layer is liquid-philic.

32. The rotating separator according to claim 31 wherein said media layer is oleophilic.

33. The rotating separator according to claim 1 wherein said rotating separator is an internal combustion engine crankcase ventilation rotating separator separating oil from air in blowby gas from the crankcase, said inlet supplying said blowby gas from said crankcase to said hollow interior, said outlet delivering cleaned separated air from said plenum, said drain draining separated oil from said plenum.

34. The rotating separator according to claim 1 wherein said fluid mixture is a gas-liquid mixture.

35. The rotating separator according to claim 1 wherein said fluid mixture is a liquid-liquid mixture comprising a first liquid separated from said mixture and drained to said drain, and a remaining liquid supplied to said outlet.

36. The rotating separator according to claim 35 wherein said rotating separator is a fuel-water separator.

37. The rotating separator according to claim 1 wherein said fins extend axially downward said inner surface of said sidewall of said housing in a rectilinear manner.