| 主权项 |
1. An oxygen concentrator comprising:
a compressed air supply source for outputting compressed air; first and second sieve beds including an absorbing material configured to selectively adsorb nitrogen from air under increased pressure and discharge the adsorbed nitrogen under reduced pressure integrated therein and configured to generate oxygen at a high concentration by separating nitrogen from the compressed air; an air supply flow channel supplying the compressed air from the compressed air supply source to the respective sieve beds respectively; an exhaust flow channel discharging exhaust air in each of the sieve beds to the atmosphere respectively, the air supply flow channel including a main flow channel connected to the compressed air supply source and first and second branch flow channels branched from the main flow channel and connected to the first and second sieve beds, first and second air supply valves provided respectively in the first and second branch flow channels and configured to communicate the compressed air supply source with the first and second sieve beds alternately; and an exhaust valve provided in the exhaust flow channel and configured to communicate the first sieve bed with the atmosphere when the first air supply valve is closed, and communicate the second sieve bed with the atmosphere when the second air supply valve is closed, wherein the air supply valves each include a diaphragm valve as a main valve and an electromagnetic pilot valve driving the main valve in a direction of closing the branch flow channel by pilot air, a pilot flow channel supplying the pilot air to the electromagnetic pilot valves is branched from a position on the upstream side of the air supply valves in the air supply flow channel, and a check valve preventing the pilot air from flowing reversely is provided in the pilot flow channel. |
