Patent ID: 8337599

Claim:
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, and wherein 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.