Air dryer for compressed air system having a serviceable oil filter
AssigneeAlliedSignal Inc.
InventorDavid J. Goodell
Life of this patent
Estimating the term…
Abstract
Air dryer for a compressed air system includes a desiccant canister and a tubular oil filter received within a cavity within the canister circumscribed by a desiccant bed. A tubular oil filter is mounted on a removable module so that the module and the oil filter may be removed from the air dryer without disturbing the desiccant canister. Accordingly, the oil filter is replaced at more frequent intervals than is the desiccant. During purging, purge air is bypassed around the oil filter directly to the exhaust port through a check valve permitting communication through a bypass passage only during purging.
Claims18
Air dryer for compressed air system comprising a housing having a supply port and a delivery port, said housing defining a flow path between the supply and delivery ports, a desiccant canister in said flow path for removing moisture entrained in said compressed air, an oil filter in said flow path between the supply port and said desiccant canister for removing oil entrained in said compressed air, said housing further including a control port, a purge port, and a purge valve responsive to the fluid pressure level at the control port to close said supply port and to communicate said flow path to said purge port for causing backflow of air through said flow path through said desiccant canister to said purge port during purging of the canister, said flow path including a bypass passage bypassing said oil filter, and a check valve in said bypass passage preventing communication through the bypass passage when compressed air flows from said supply port to the delivery port but permitting communication through said bypass passage during purging of the desiccant.
Air dryer for compressed air system comprising a housing having a supply port and a delivery port, said housing defining a flow path between the supply and delivery ports, a desiccant canister in said flow path for removing moisture entrained in said compressed air, an oil filter in said flow path between the supply port and said desiccant canister for removing oil entrained in said compressed air, said housing further including a control port, a purge port, and a purge valve responsive to the fluid pressure level at the control port to close said supply port and to communicate said flow path to said purge port for causing backflow of air through said flow path through said desiccant canister to said purge port during purging of the canister, and mounting means mounting said oil filter in said housing but permitting removal of said oil filter from said housing without first removing the desiccant canister.
Air dryer for compressed air system comprising a housing having a supply port and a delivery port, said housing defining a flow path between the supply and delivery ports, a desiccant canister in said flow path for removing moisture entrained in said compressed air, an oil filter in said flow path between the supply port and said desiccant canister for removing oil entrained in said compressed air, said housing further including a control port, a purge port, and a purge valve responsive to the fluid pressure level at the control port to close said supply port and to communicate said flow path to said purge port for causing backflow of air through said flow path through said desiccant canister to said purge port during purging of the canister, said canister defining an annular compartment enclosing desiccant material and defining a central cavity, said oil filter being a tubular member mounted within said central cavity.
Dependencies are inferred from the claim text.