A portable oxygen concentrator includes a pair of sieve beds having first and second ends, a compressor for delivering air to the first ends of the sieve beds, a reservoir communicating with the second ends of the sieve beds, and an air manifold attached to the first ends of the sieve beds. The air
A portable oxygen concentrator includes a pair of sieve beds having first and second ends, a compressor for delivering air to the first ends of the sieve beds, a reservoir communicating with the second ends of the sieve beds, and an air manifold attached to the first ends of the sieve beds. The air manifold includes passages therein communicating with the compressor and the first ends of the sieve beds. A set of valves is coupled to the air manifold, and a controller is coupled to the valves for selectively opening and closing the valves to alternately charge and purge the sieve beds to deliver concentrated oxygen into the reservoir. An oxygen delivery manifold communicates with the second ends of the sieve beds for delivering oxygen from the reservoir to a user. Pressure sensors may be provided in the reservoir and/or delivery line for controlling operation of the controller.
대표청구항▼
We claim: 1. A portable oxygen concentrator, comprising: a plurality of sieve beds adapted to absorb nitrogen from air, each sieve bed comprising an air inlet/outlet end and an oxygen inlet/outlet end; a purge orifice adapted to communicate continuously between the oxygen inlet/outlet ends of a pai
We claim: 1. A portable oxygen concentrator, comprising: a plurality of sieve beds adapted to absorb nitrogen from air, each sieve bed comprising an air inlet/outlet end and an oxygen inlet/outlet end; a purge orifice adapted to communicate continuously between the oxygen inlet/outlet ends of a pair of sieve beds in the plurality of the sieve beds; at least one reservoir communicating with the oxygen inlet/outlet ends of the plurality of sieve beds for storing oxygen exiting from the oxygen inlet/outlet ends of the plurality of sieve beds; a compressor for delivering air at one or more desired pressures to the air inlet/outlet ends of the plurality of sieve beds; a set of valves between the compressor and the air inlet/outlet ends of the plurality of sieve beds; a controller coupled to the valves for selectively opening and closing the valves to alternately charge the plurality of sieve beds by delivering compressed air into the plurality of sieve beds through the air inlet/outlet ends to cause oxygen to exit from the oxygen inlet/outlet ends into the reservoir and purge plurality of the sieve beds by evacuating pressurized nitrogen from the plurality of sieve beds through the air inlet/outlet ends, and wherein oxygen passes from a sieve bed being charged to a sieve bed being purged via the purge orifice to assist evacuating nitrogen from the sieve bed being purged; and an exhaust passage communicating with the air inlet/outlet ends of the plurality of sieve beds, wherein the exhaust passage is configured to deliver a flow of nitrogen evacuated from the plurality such that the flow of the nitrogen is directed at or across the controller to cool the controller. 2. The portable oxygen concentrator of claim 1, further comprising one or more check valves between the plurality of sieve beds and the reservoir for preventing oxygen from flowing from the reservoir into the plurality of sieve beds. 3. The portable oxygen concentrator of claim 1, further comprising an air manifold providing a plurality of passages therein communicating between the compressor and the air inlet/outlet ends of the plurality of sieve beds, the valves coupled to the air manifold for selectively opening and closing the passages. 4. The portable oxygen concentrator of claim 1, the plurality of sieve beds comprising a first sieve bed and a second sieve bed, the controller configured for periodically opening a first subset of the valves to charge the first sieve bed and purge the second bed, and opening a second subset of the valves to charge the second sieve bed and purge the first sieve bed. 5. The portable oxygen concentrator of claim 4, the controller further configured for opening a third subset of the valves to charge the first sieve bed and the second sieve bed between opening the first subset of the valves and the second subset of the valves. 6. The portable oxygen concentrator of claim 5, the controller configured for opening the first subset of the valves and the second subset of the valves for a first length of time and a second length of time, and for opening the third subset of the valves for a third length of time that is less than the first and the second lengths of time. 7. The portable oxygen concentrator of claim 1, further comprising a delivery line communicating with the reservoir and a delivery valve communicating with the delivery line, the controller coupled to the delivery valve for selectively opening and closing the delivery line to deliver oxygen from the reservoir to a user. 8. The portable oxygen concentrator of claim 7, further comprising a pressure sensor communicating with the delivery line for detecting inhalation by the user, the controller coupled to the pressure sensor for opening the delivery valve responsive to inhalation by the user to deliver a pulse of oxygen from the reservoir to the user. 9. A method for concentrating oxygen comprising: providing a portable apparatus comprising: a plurality of sieve beds each sieve bed in the plurality of sieve beds including a first end and a second end, a reservoir communicating with the second ends of the plurality of sieve beds, a compressor, a set of valves between the compressor and the first ends of the plurality of sieve beds, and control electronics adapted to control operation of the valves; selectively opening and closing the valves to alternately charge the plurality of sieve beds by delivering compressed air into the plurality of sieve beds through the first ends to cause oxygen to exit from the second ends into the reservoir and purge the plurality of sieve beds to evacuate pressurized nitrogen from the plurality of sieve beds through the first ends, wherein oxygen passes from a sieve bed being charged to a sieve bed being purged via a purge orifice to assist evacuating nitrogen from the sieve bed being purged; and directing the nitrogen evacuated from the sieve beds at or across the control electronics to cool the control electronics. 10. The method of claim 9, wherein the step of selectively opening and closing the valves comprises a cycle including the following sequential steps: a) charging a first sieve bed while purging a second sieve bed, whereby oxygen passes from the first sieve bed to the second sieve bed via the purge orifice; b) simultaneously charging the first and second sieve beds to direct gas from the first sieve bed into the second sieve bed; c) charging the second sieve bed while purging the first sieve bed, whereby oxygen passes from the second sieve bed to the first sieve bed via the purge orifice; and d) simultaneously charging the first and second sieve beds after step c) to direct gas from the second sieve bed into the first sieve bed. 11. A method for concentrating oxygen comprising: providing a portable apparatus comprising a first sieve bed and a second sieve bed, each of the first sieve bed and the second sieve bed including a first end and a second end, a reservoir communicating with the second ends of the first and the second sieve beds, a compressor, and a set of valves disposed between the compressor and the first ends of the first and the second sieve beds; opening a first subset of the valves to deliver air into the first sieve bed to cause oxygen to exit from the first sieve bed into the reservoir and evacuate pressurized nitrogen from the second bed; opening a second subset of the valves to deliver air into the second sieve bed to cause oxygen to exit from the second sieve bed into the reservoir and evacuate pressurized nitrogen from the first sieve bed; and opening a third subset of the valves between opening the first and second subsets of the valves to deliver air simultaneously into the first sieve bed and the second sieve bed. 12. The method of claim 11, wherein the third subset of the valves includes at least one of the first subset of valves and at least one of the second subset of valves. 13. The method of claim 11, wherein the first and the second subsets of the valves are opened for first and second lengths of time, and the third subset of the valves is opened for a third length of time that is less than the first and the second lengths of time. 14. The method of claim 13, wherein the first and the second lengths of time are at least about four seconds. 15. The method of claim 13, wherein the third length of time is not more than about 1.5 seconds. 16. The method of claim 13, wherein at least one of the first and the second lengths of time are adjusted based upon a pressure within the reservoir. 17. The method of claim 16, wherein at least one of the first and the second lengths of time are shortened as the pressure within the reservoir increases. 18. The method of claim 11, wherein the first and the second subsets of the valves are alternately opened after opening the third subset of the valves. 19. The method of claim 11, wherein the step of opening the second subset of the valves comprises closing at least one valve in the first subset of the valves. 20. The method of claim 11, wherein the apparatus comprises a purge orifice communicating between the first sieve bed and the second sieve bed such that at least a portion of the oxygen exiting the first and the second sieve beds during charging is delivered into the other of the first and the second sieve beds to facilitate purging nitrogen from the other of the first and the second sieve beds. 21. The method of claim 11, further comprising delivering oxygen from the reservoir to a user. 22. The method of claim 21, wherein the oxygen is delivered from the reservoir in pulses. 23. The method of claim 22, further comprising detecting inhalation by the user, the oxygen being delivered from the reservoir in pulses corresponding to inhalation by the user.
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