Oxygen concentrator
An apparatus to provide an oxygen concentrator that is a pressure swing adsorption-type oxygen concentrator equipped with; at least one adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen, an air supply device to supply compressed air to the adsorption bed, a flow channel switching device to repeat at a predetermined timing an adsorption step to supply air from the air supply device to the adsorption bed to isolate concentrated oxygen and a desorption step to depressurize the adsorption bed to regenerate the adsorbent therein, and a flow rate setting device to set a volume of concentrated oxygen supplied to a user; comprising an exhaust pipe channel equipped with a leak valve in a flow channel between the air supply device and the adsorption bed to release a part of compressed air that is to be supplied to the adsorption bed into atmosphere.
1. A pressure swing adsorption-type oxygen concentrator including
at least one adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen,
an air supply device to supply compressed air to the adsorption bed,
a flow channel switching device to repeat at a predetermined timing an adsorption step to supply air from the air supply device to the adsorption bed to isolate concentrated oxygen and a desorption step to depressurize the adsorption bed to regenerate the adsorbent therein, and
a flow rate setting device to set a volume of concentrated oxygen supplied to a user, comprising
an exhaust pipe channel equipped with a leak valve in a flow channel between the air supply device and the adsorption bed to release a part of compressed air that is to be supplied to the adsorption bed into atmosphere, and
a control device to control
an air supply volume from the air supply device based on a predetermined flow rate in the flow rate setting device,
the air supply volume from the air supply device at a certain value when the predetermined flow rate is equal to or below a given flow rate, and
a release volume of compressed air through the leak valve as determined based on the predetermined flow rate.
2. The oxygen concentrator according to claim 1 , wherein the exhaust pipe channel is branched from a pipe channel connecting the air supply device and the channel switching device and equipped with a flow rate control valve as the leak valve.
3. The oxygen concentrator according to claim 1 , wherein
the air supply device is a compressor with an inverter and
the control device is to control
the number of revolution of a compressor based on a predetermined value in the flow rate setting device,
the number of revolution of the compressor at a certain value when a predetermined flow rate is equal to or below a given flow rate, and
an open/shut operation of the leak valve to release from the exhaust pipe channel a certain release volume determined based on a predetermined value in the flow rate setting device.
4. A pressure swing adsorption-type oxygen concentrator including
at least one adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen,
an air supply device to supply compressed air to the adsorption bed,
a flow channel switching device to repeat at a predetermined timing an adsorption step to supply air from the air supply device to the adsorption bed to isolate concentrated oxygen and a desorption step to depressurize the adsorption bed to regenerate the adsorbent therein, and
a flow rate setting device to set a volume of concentrated oxygen supplied to a user, comprising
a control device comprising a control device to control a switching timing of the flow channel switching device that determines a release volume of compressed air immediately before completion of an adsorption step, based on a predetermined value in the flow rate setting device, and to release a part of compressed air that is to be supplied to the adsorption bed immediately before the completion of the adsorption step.
5. The oxygen concentrator according to claim 4 , wherein the flow channel switching device comprises a two-way electromagnetic valve (a) installed on a compressed air supply pipe connecting the air supply device and the adsorption bed, a branch pipe channel between the adsorption bed and an exhaust side installed in a downstream side of the two-way electromagnetic valve (a) and a two-way electromagnetic valve (b) installed on the branch pipe channel in the release side.
6. The oxygen concentrator according to claim 4 , wherein the adsorption bed is composed of two adsorption beds and the flow channel switching device comprises a branch pipe channel connecting the air supply device and each adsorption bed to supply compressed air, two-way electromagnetic valves (a 1 and a 2 ) installed on each branch pipe channel, a branch pipe channel in the adsorption bed and an exhaust side installed in a downstream side of the two-way electromagnetic valves (a 1 and a 2 ), two-way electromagnetic valves (b 1 and b 2 ) installed on each branch pipe channel in the exhaust side and a branch pipe channel connecting an exhaust outlet and the two-way electromagnetic valves (b 1 and b 2 ).
7. The oxygen concentrator according to claim 6 , wherein the flow channel switching device comprises each manifold of a branch pipe channel connecting the air supply device and each adsorption bed to supply compressed air, two-way electromagnetic valves (a 1 and a 2 ) installed on each branch pipe channel, a branch pipe channel in the adsorption bed and an exhaust side installed in a downstream side of the two-way electromagnetic valves (a 1 and a 2 ), two-way electromagnetic valves (b 1 and b 2 ) installed on each branch pipe channel in the exhaust side and a branch pipe channel connecting an exhaust outlet and the two-way electromagnetic valves (b 1 and b 2 ).