초록 ▼

Detectable vapors, odors and smells are removed from a stream of compressed air entering a tubular cartridge and passing axially through a cylindrical bonded granular or supported granular sorbent bed or radially through a bonded granular or supported granular tubular sorbent bed arranged so that th

Detectable vapors, odors and smells are removed from a stream of compressed air entering a tubular cartridge and passing axially through a cylindrical bonded granular or supported granular sorbent bed or radially through a bonded granular or supported granular tubular sorbent bed arranged so that the air velocity therethrough is not greater than 300 ft/min and the minimum contact time with the granules is 0.1 seconds, the bed being arranged to be traversed by the entire volume of air passing through the cartridge. The air then passes through a surrounding microporous or pleated filter element prior to being discharged radially from the cartridge.

대표청구항 ▼

1. A filter cartridge comprising: an elongated rigid support tube having a major portion of the length of its wall impervious to the passage of gas therethrough an a minor portion of the length of its wall extending from one end of said major portion and arranged for the discharge of gas peripher

1. A filter cartridge comprising: an elongated rigid support tube having a major portion of the length of its wall impervious to the passage of gas therethrough an a minor portion of the length of its wall extending from one end of said major portion and arranged for the discharge of gas peripherally around said tube from the inside to the outside thereof; a pair of end closure members respectively applied to the ends of said support tube, the end closure member remote from said minor portion being formed with an inlet port; a single bed of sorbent carbon material contained within said support tube and arranged for the removal of molecular size contamination from a gas stream when flowing from said inlet port, said bed completely extending over the full length of said support tube between locations substantially at said end closure members and consisting of one closely packed mass of material in the form of a column which consists of porous solids throughout the volume of said column, the flow of the gas stream from said inlet port taking place substantially through the whole length of said bed in a single direction longitudinally with respect to the central axis of said column before being discharged peripherally from said tube; and a filter medium arranged in series with said sorbent bed to receive the gas stream discharged from said sorbent bed, said filter medium being operative to arrest any particulate material carried over from said sorbent bed and then to discharge the gas stream immediately from the cartridge, said filter medium being a filter element located immediately adjacent said sorbent bed and so positioned that the gas discharged from said sorbent bed flows radially outward from said sorbent bed through the filter element to be discharged radially outward of said cartridge through said filter element. 2. A filter cartridge according to claim 1 in which said sorbent bed is designed in relation to the system with which it is to be used so that when in use the gas passes through said bed at a linear velocity of less than 300 feet per minute with a minimum contact time of 0.1 seconds with the sorbent bed. 3. A filter cartridge according to claim 1 in which said filter element is tubular and surrounds a portion only of said sorbent bed. 4. A filter cartridge according to claim 1 in which said sorbent bed presents a gas entry area extending over the whole of the top of said sorbent bed and a gas outlet area encircling a lowermost portion of said sorbent bed. 5. A filter cartridge according to claim 1 in which said filter element is a microfibre filter tube. 6. A filter cartridge according to claim 1 wherein said cartridge includes a fabric impregnated with a dye interposed between said sorbent bed and said filter medium whereby the apperance of dye colored oil on the filter medium will indicate oil contamination of said gas stream. 7. A cylindrical filter cartridge for purifying a stream of gas while passing through the cartridge, the cartridge including elongated rigid support tube means and two end members respectively covering opposite ends of said support tube means, one of said end members being formed with a central inlet port for the gas stream and the other of said end members being constructed to prevent the passage of gas therethrough, a compact sorbent bed mounted as a unit within said support tube means and comprising a single essentially solid column of sorbent material that extends completely over the full length of said cartridge between locations that are respectively disposed substantially at said end members, said sorbent bed unit presenting at its upper end a gas entry area adjacent said inlet port that feeds into only one closely packed column of porous solid material having a high internal surface area to the gas stream passing via said gas entry area through said column of material, said support tube means comprising an upper wall portion impervious to the passage of gas therethrough and a lower wall portion pervious to the passage of gas therethrough to provide a peripheral gas outlet area from said bed, and a tubular filter element located within said support tube means adjacent substantially only said pervious lower wall portion, the total gas stream discharged from said sorbent bed unit passing radially through said filter element and then escaping radially outward from said cartridge via said pervious lower wall portion of said support tube means, said filter element being effective to arrest any particulate contamination which is carried in said gas stream from said sorbent bed unit, and said sorbent bed unit being formed in relation to the cartridge to carry the gas stream at a linear velocity less than 300 feet per minute with a minimum contact time of 0.1 seconds with said sorbent bed while removing molecular size contamination from the gas stream as the gas stream passes through the entire volume of said sorbent bed unit from said inlet port to said peripheral gas outlet area of said sorbent bed unit. 8. A cylindrical filter cartridge for purifying a stream of gas while passing through the cartridge, the cartridge comprising a container in the form of a vertical cylinder and including two end members respectively covering opposite ends of said container, one of said end members being formed with inlet means for the gas stream and the other of said end members being constructed to prevent the passage of gas therethrough; a single compact sorbent bed mounted in the form of an essentially solid column that extends substantially completely over the full length of said container between locations that are respectively disposed substantially at said closure members, said sorbent bed comprising only one closely packed column of porous solid material which presents a high internal surface area to the gas stream; said cylinder consisting of a wall that is impervious to the passage of gas therethrough along a major portion of its length and a coaxial extension of said wall consisting of a foraminous rigid tube and a tubular filter medium fitting inside said foraminous tube whereby the gas being filtered flows longitudinally through a major portion of said sorbent bed from said inlet means and through the entire volume of said sorbent bed prior to being discharged radially through said filter medium and foraminous tube and so radially from the cartridge, said filter medium being effective to arrest any particulate contamination which is carried in said gas stream from said sorbent bed.