The present invention relates to an oxygen concentrator in which a pulsation detection device for detecting pulsation of oxygen supplied and a control device for controlling an amount of air supplied from a compressor based on the detection results in a pressure swing adsorption-type oxygen concentr
The present invention relates to an oxygen concentrator in which a pulsation detection device for detecting pulsation of oxygen supplied and a control device for controlling an amount of air supplied from a compressor based on the detection results in a pressure swing adsorption-type oxygen concentrator, which is equipped with an adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen, the compressor for supplying air to the adsorption bed, a channel switching valve to repeat in a constant timing an adsorption step, in which air is supplied from the compressor to the adsorption bed to isolate concentrated oxygen and a desorption step, in which the adsorption bed is evacuated to regenerate the adsorbent and a flow rate measuring device for determining a supply flow rate of concentrated oxygen produced and an amount of oxygen produced is controlled by a feedback with a flow rate sensor by itself after paying attention to variation of a product flow rate caused by suppressing an amount of oxygen produced, thereby realizing an apparatus to satisfy secondary performance such as miniaturization, low power consumption and silencing.
대표청구항▼
1. A pressure swing adsorption-type oxygen concentrator comprising an adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen, a compressor for supplying air to the adsorption bed, a channel switching valve to repeat in a constant timing an adsorption ste
1. A pressure swing adsorption-type oxygen concentrator comprising an adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen, a compressor for supplying air to the adsorption bed, a channel switching valve to repeat in a constant timing an adsorption step, in which air is supplied from the compressor to the adsorption bed to isolate concentrated oxygen and a desorption step, in which the adsorption bed is evacuated to regenerate the adsorbent, a flow rate setting device for setting a supply flow rate of the concentrated oxygen produced, and a flow rate measuring device for determining a supply flow rate of concentrated oxygen produced, wherein a pulsation detection device for detecting pulsation of oxygen supplied, detecting a variation of a flow rate measured by the flow rate measuring device to a flow rate provided by the flow rate setting device, and a control device of an amount of air supplied from the compressor based on the pulsation detection results are provided,wherein the pulsation detection device is the flow rate measuring device with a function of determining a peak flow rate and/or bottom flow rate of the concentrated oxygen supplied and the control device is a device to control an increase or decrease of an amount of air supplied from the compressor, when the peak flow rate value or the bottom flow rate value per predetermined time exceeds a predetermined range of a threshold value, andwherein the pulsation detection device is a device to detect and calculate the peak flow rate value (Lp) and the bottom flow rate value (Lb) in a single sequence of adsorption-desorption in the pressure swing adsorption method to make comparison with a predetermined threshold value. 2. A pressure swing adsorption-type oxygen concentrator comprising an adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen, a compressor for supplying air to the adsorption bed, a channel switching valve to repeat in a constant timing an adsorption step, in which air is supplied from the compressor to the adsorption bed to isolate concentrated oxygen and a desorption step, in which the adsorption bed is evacuated to regenerate the adsorbent, a flow rate setting device for setting a supply flow rate of the concentrated oxygen produced, and a flow rate measuring device for determining a supply flow rate of concentrated oxygen produced, wherein a pulsation detection device for detecting pulsation of oxygen supplied, detecting a variation of a flow rate measured by the flow rate measuring device to a flow rate provided by the flow rate setting device, and a control device of an amount of air supplied from the compressor based on the pulsation detection results are provided,wherein the pulsation detection device is the flow rate measuring device with a function of determining a peak flow rate and/or bottom flow rate of the concentrated oxygen supplied and the control device is a device to control an increase or decrease of an amount of air supplied from the compressor, when the peak flow rate value or the bottom flow rate value per predetermined time exceeds a predetermined range of a threshold value andwherein the pulsation detection device is a device to make comparison with the predetermined threshold value based on a rate of a flow rate variation represented by the equation of (peak flow rate value (Lp)−bottom flow rate value (Lb))/predetermined flow rate value. 3. A pressure swing adsorption type oxygen concentration method for producing an oxygen-concentrated gas by repeating in a constant timing an adsorption step to supply pressurized air to an adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen to isolate an oxygen-concentrated gas and a desorption step to evacuate the adsorption bed to regenerate the adsorbent, comprising, step 1 of controlling an amount of the pressurized air supplied based on a predetermined value of a supply flow rate of an oxygen-concentrated gas produced,step 2 of detecting pulsation of the oxygen-concentrated gas, detected a variation of a flow rate measured by a flow rate measuring device to a flow rate provided by a flow rate setting device, andstep 3 of controlling the amount of the pressurized air based on detection results of the pulsation,wherein step 2 of detecting pulsation of the oxygen-concentrated gas is a step to determine the peak flow rate and/or bottom flow rate of the oxygen-concentrated gas supplied and detect whether or not the peak flow rate value or the bottom flow rate value is within a predetermined range of a threshold value, and to control an increase or decrease of an amount of the pressurized air supplied when the rate exceeds the threshold value andwherein step 2 of detecting pulsation of the oxygen-concentrated gas detects and calculates the peak flow rate value (Lp) and the bottom flow rate value (Lb) in a single sequence of the adsorption-desorption in the pressure swing adsorption method to make comparison with a predetermined threshold value. 4. A pressure swing adsorption type oxygen concentration method for producing an oxygen-concentrated gas by repeating in a constant timing an adsorption step to supply pressurized air to an adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen to isolate an oxygen-concentrated gas and a desorption step to evacuate the adsorHption bed to regenerate the adsorbent, comprising, step 1 of controlling an amount of the pressurized air supplied based on a predetermined value of a supply flow rate of an oxygen-concentrated gas produced,step 2 of detecting pulsation of the oxygen-concentrated gas, detected a variation of a flow rate measured by a flow rate measuring device to a flow rate provided by a flow rate setting device, andstep 3 of controlling the amount of the pressurized air based on detection results of the pulsation,wherein step 2 of detecting pulsation of the oxygen-concentrated gas is a step to determine the peak flow rate and/or bottom flow rate of the oxygen-concentrated gas supplied and detect whether or not the peak flow rate value or the bottom flow rate value is within a predetermined range of a threshold value, and to control an increase or decrease of an amount of the pressurized air supplied when the rate exceeds the threshold value andwherein step 2 of detecting pulsation of the oxygen-concentrated gas makes comparison with the predetermined threshold value based on a rate of flow rate variation represented by the equation of (peak flow rate value (Lp)−bottom flow rate value (Lb))/predetermined flow rate value. 5. A pressure swing adsorption type oxygen concentration method for producing an oxygen-concentrated gas by repeating in a constant timing, an adsorption step to supply pressurized air to an adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen to isolate an oxygen-concentrated gas and a desorption step to evacuate the adsorption bed to regenerate the adsorbent, wherein step 1 of controlling an amount of the pressurized air supplied based on a predetermined value of a supply flow rate of an oxygen-concentrated gas produced,step 2 of detecting pulsation of the oxygen-concentrated gas is a step to determine the peak pressure and/or bottom pressure of the oxygen-concentrated gas supplied and detect whether or not the peak pressure value or the bottom pressure value per a predetermined time is within a predetermined range of a threshold value, andstep 3 of controlling the amount of the pressurized air based on detection results of the pulsation,wherein step 2 of detecting pulsation of the oxygen-concentrated gas detects and calculates the peak flow rate value (Lp) and the bottom flow rate value (Lb) in a single sequence of the adsorption-desorption in the pressure swing adsorption method to make comparison with a predetermined threshold value. 6. A pressure swing adsorption type oxygen concentration method for producing an oxygen-concentrated gas by repeating in a constant timing an adsorption step to supply pressurized air to an adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen to isolate an oxygen-concentrated gas and a desorption step to evacuate the adsorption bed to regenerate the adsorbent, comprising, step 1 of controlling an amount of the pressurized air supplied based on a predetermined value of a supply flow rate of an oxygen-concentrated gas produced,step 2 of detecting pulsation of the oxygen-concentrated gas, detected a variation of a flow rate measured by a flow rate measuring device to a flow rate provided by a flow rate setting device, andstep 3 of controlling the amount of the pressurized air based on detection results of the pulsation,wherein step 2 of detecting pulsation of the oxygen-concentrated gas is a step to determine the peak flow rate and/or bottom flow rate of the oxygen-concentrated gas supplied and detect whether or not the peak flow rate value or the bottom flow rate value is within a predetermined range of a threshold value, and to control an increase or decrease of an amount of the pressurized air supplied when the rate exceeds the threshold valuewherein the pulsation detection device judges as pulsation being occurred when the peak flow rate value or the bottom flow rate value exceeds a range of ±5% relative to a predetermined value of the flow rate value and controls to increase an amount of the pressurized air supplied andwherein step 2 of detecting pulsation of the oxygen-concentrated gas detects and calculates the peak flow rate value (Lp) and the bottom flow rate value (Lb) in a single sequence of the adsorption-desorption in the pressure swing adsorption method to make comparison with a predetermined threshold value. 7. A pressure swing adsorption type oxygen concentration method for producing an oxygen-concentrated gas by repeating in a constant timing an adsorption step to supply pressurized air to an adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen to isolate an oxygen-concentrated gas and a desorption step to evacuate the adsorption bed to regenerate the adsorbent, comprising, step 1 of controlling an amount of the pressurized air supplied based on a predetermined value of a supply flow rate of an oxygen-concentrated gas produced,step 2 of detecting pulsation of the oxygen-concentrated gas, detected a variation of a flow rate measured by a flow rate measuring device to a flow rate provided by a flow rate setting device, andstep 3 of controlling the amount of the pressurized air based on detection results of the pulsation,wherein step 2 of detecting pulsation of the oxygen-concentrated gas is a step to determine the peak flow rate and/or bottom flow rate of the oxygen-concentrated gas supplied and detect whether or not the peak flow rate value or the bottom flow rate value is within a predetermined range of a threshold value, and to control an increase or decrease of an amount of the pressurized air supplied when the rate exceeds the threshold value,wherein the pulsation detection device judges as pulsation being occurred when the peak flow rate value or the bottom flow rate value exceeds a range of ±5% relative to a predetermined value of the flow rate value and controls to increase an amount of the pressurized air supplied andwherein step 2 of detecting pulsation of the oxygen-concentrated gas makes comparison with the predetermined threshold value based on a rate of flow rate variation represented by the equation of (peak flow rate value (Lp)−bottom flow rate value (Lb))/predetermined flow rate value.
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