A rotary adsorbent dryer is provided which includes a stationary outer housing having spaced stationary end walls, and a rotor mounted for rotation within the outer housing. A plurality of compressed gas passages pass through the end walls to provide compressed gas flow to or from a respective subst
A rotary adsorbent dryer is provided which includes a stationary outer housing having spaced stationary end walls, and a rotor mounted for rotation within the outer housing. A plurality of compressed gas passages pass through the end walls to provide compressed gas flow to or from a respective substantially open end of the rotor. A drive arrangement is provided which is cooperable with an outer circumferential region of the rotor so that it is not necessary to provide a drive shaft which extends axially through desiccant material within the rotor.
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1. A rotary adsorbent dryer including a stationary outer housing having spaced stationary end walls, a rotor rotatably mounted within said outer housing for rotation about a rotation axis, the rotor having substantially open opposed ends, each of which is positioned adjacent to a respective one of t
1. A rotary adsorbent dryer including a stationary outer housing having spaced stationary end walls, a rotor rotatably mounted within said outer housing for rotation about a rotation axis, the rotor having substantially open opposed ends, each of which is positioned adjacent to a respective one of the end walls of the outer housing, a plurality of first compressed gas flow passages passing through the end walls providing, in use, compressed gas flow to or from a respective substantially open end of the rotor, and a drive arrangement for rotating the rotor about the rotation axis, the drive arrangement being cooperable with an outer circumferential region of the rotor, wherein the drive arrangement provides discontinuous movement of the rotor whereby the rotor is stationary for a predetermine period of time between periods of discontinuous rotational movement. 2. A rotary adsorbent dryer according to claim 1 wherein the rotor is a rotary drum which includes a desiccant media and a drive shaft is excluded from extending axially through the rotary drum. 3. A rotary adsorbent dryer according to claim 1 wherein the rotor includes a continuous annular wall extending axially between said open ends and the stationary outer housing includes a continuous outer annular wall of greater diameter than the annular wall of the rotor whereby an annular space is formed therebetween. 4. A rotary adsorbent dryer according to claim 3, wherein a seal arrangement is provided which is operable to prevent gas flow axially along the annular space. 5. A rotary adsorbent dryer according to claim 1, further including at least one seal member operably engaging at least one end region of the rotor, and an urging arrangement for providing an urging force to urge the least one seal member into operable sealing engagement with the at least one end region of the rotor while the rotor is stationary. 6. A rotary adsorbent dryer according to claim 1, wherein said predetermined period of time that the rotor is stationary is selectably variable. 7. A rotary adsorbent dryer according to claim 1, wherein said drive arrangement includes a ratchet ring having a plurality of ratchet teeth connected to, or integrally formed in, an outer peripheral surface of the rotor, and at least one movable ratchet pawl engageable with the ratchet teeth of the ratchet ring to cause said rotor to rotate. 8. A rotary adsorbent dryer according to claim 7, wherein the drive arrangement includes a control to actuate the at least one ratchet pawl selectably to vary rotational speed of the rotor. 9. A rotary adsorbent dryer according to claim 3, further including at least one bearing ring surrounding and supporting an outer circumferential surface zone of the rotor. 10. A rotary adsorbent dryer according to claim 9, wherein at least the or each outer surface zone of the rotor carries a dry lubricant surface coating cooperable with the or each said bearing ring. 11. A rotary adsorbent dryer according to claim 3, wherein the rotor is supported for rotation by idler rollers engaging the cylindrical outer wall surface of the rotor. 12. A rotary adsorbent dryer including spaced first and second stationary end walls, a rotor rotatably mounted between the spaced first and second stationary end walls for rotation therebetween, the rotor having substantially open opposed ends, a plurality of first compressed gas flow passages passing through said first and said second stationary wall means providing, in use, compressed gas flow to or from a respective substantially open end of the rotor, a drive arrangement for rotating the rotor about a rotation axis in a discontinuous motion whereby the rotor is stationary for a predetermined period of time between periods of rotational movement, the rotary adsorbent dryer further including a seal arrangement including at least one seal member operably engaging at least one end region of said rotor, and an urging arrangement for providing an urging force to urge the at least one seal member into operable sealing engagement with the at least one end region of the rotor while the rotor is stationary. 13. A rotary adsorbent dryer according to claim 12, wherein the urging force is relaxed when the rotor is rotationally moved. 14. A rotary adsorbent dryer according to claim 12 wherein the at least one seal member engages at least a peripheral end surface of said rotor. 15. A rotary adsorbent dryer according to claim 14, wherein the seal arrangement includes a sealing portion engageable with an end surface of a desiccant media material positioned within the rotor. 16. A rotary adsorbent dryer according to claim 15, wherein the sealing portion includes at least two radial legs meeting at a centre location. 17. A rotary adsorbent dryer according to claim 12, wherein the urging arrangement includes at least one floating head member cooperable with the seal member located at at least one end of the rotor, the at least one floating head member being partially axially movable only when the rotor is stationary. 18. A rotary adsorbent dryer according to claim 17, wherein the floating member is mounted to be non-rotational about the rotation axis of the rotor, the floating head member further including a plurality of second gas flow passages, each cooperable with a respective first gas flow passage passing through a respective stationary end wall, and a sliding seal operable between each pair of cooperating first and said second gas flow passages. 19. A rotary adsorbent dryer according to claim 1 including: an enclosed chamber located outwardly of an adjacent one of the spaced end walls; anda heat exchanger arrangement positioned in the enclosed chamber whereby the compressed gas flow to the rotary adsorbent dryer passes through the heat exchanger arrangement through a further flow passage formed in a first end wall of the spaced end walls and through a first pipe leading to a gas flow passage in a second wall of the spaced end walls, the second end wall being spaced from the first end wall. 20. A rotary adsorbent dryer comprising: a stationary outer housing having spaced stationary end walls, a rotor rotatably mounted within said outer housing for rotation about a rotation axis, the rotor having substantially open opposed ends, each of which is positioned adjacent to a respective one of the end walls of the outer housing, a plurality of first compressed gas flow passages passing through the end walls providing, in use, compressed gas flow to or from a respective substantially open end of the rotor, and a drive arrangement for rotating the rotor about the rotation axis, the rotary adsorbent dryer further including:an enclosed chamber located outwardly of an adjacent one of the spaced end walls; anda heat exchanger arrangement positioned in the enclosed chamber whereby the compressed gas flow to the rotary adsorbent dryer passes through the heat exchanger arrangement through a further flow passage formed in a first end wall of the spaced end walls and through a first pipe leading to a gas flow passage in a second wall of the spaced end walls, the second end wall being spaced from the first end wall. 21. A rotary adsorbent dryer according to claim 20, wherein a heater is located in the first pipe whereby heat can be applied to gas flow in the first pipe. 22. A rotary adsorbent dryer according to claim 1, wherein the rotary adsorbent dryer has at least two compressed gas flow paths therethrough, a first one of the compressed gas flow paths being arranged to regenerate desiccant media in the rotary adsorbent dryer by absorbing moisture from the desiccant media into the compressed gas flow along the first gas flow path, and a second one of the compressed gas flow paths being arranged to give up moisture in compressed gas flowing along the second gas flow path to the desiccant media whereby the compressed gas flowing along the second path is discharged from the rotary adsorbent dryer, dryer than when it entered the rotary adsorbent dryer. 23. A compressed gas dryer incorporating a rotary adsorbent dryer according to claim 22, wherein the compressed gas dryer includes: first cooling means to cool compressed gas discharged from the gas compressor; first moisture separation means to receive cooled compressed gas flow from said first cooling means to trap and discharge a first condensed moisture flow therefrom; and heating means to heat compressed gas flowing into said rotary adsorbent dryer along said first path.
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