Oxygen generator is a new type of equipment that can extract oxygen from the air based on Pressure Swing Adsorption (PSA) technology. Its working principle is to adsorb nitrogen in the air through the physical adsorption and desorption technology of molecular sieve, and the remaining oxygen not adsorbed will be collected and purified, and finally converted into high purity oxygen. Specifically, the compressed air is processed by an air purifier and dryer, and then enters the adsorption tower through a switching valve. Inside the adsorption tower, nitrogen is adsorbed by molecular filters, while oxygen gathers at the top of the adsorption tower and enters the oxygen storage tank. After further purification by odour removal, dust removal and bacteria removal filters, qualified medical oxygen can be obtained.
The molecular filter oxygen generator usually adopts the method of adsorption under pressure and desorption at atmospheric pressure, which is circulated through two adsorption towers to ensure the continuous supply of oxygen. After compression, the raw air is pre-treated to remove oil, dust and other solid impurities and cooled to room temperature. The treated air enters the adsorption tower equipped with molecular filters, where nitrogen and carbon dioxide are adsorbed and oxygen passes through the adsorption tower. When the adsorption tower reaches saturation, the inlet valve is closed and the rinse valve is opened to enter the rinse stage, after which the desorption valve is opened to enter the desorption and regeneration stage. By repeating this cycle, the oxygen generator is able to provide oxygen continuously.
Table of Contents
Molecular sieve type oxygen making machine
Application of pressure sensors in molecular screening oxygen generators
Oxygen concentrators are mainly used by people who have difficulty in supplying their own oxygen, those who have insufficient supply of oxygen, and those who need oxygen therapy. Due to the differences in the conditions of each person, the concentration of oxygen supplied to them needs to be different. The pressure of the adsorption tower in the oxygen concentrator is measured by means of a pressure sensor. When the pressure is higher, the more nitrogen is adsorbed and the higher the concentration of oxygen is supplied. The higher the pressure, the more nitrogen is adsorbed and the higher the concentration of oxygen is supplied, so that adjustments can be made according to the actual situation of the individual to ensure sufficient oxygen supply and avoid wastage at the same time. In addition with the pressure sensor to monitor whether the patient has begun to inhale, in order to avoid the waste of oxygen when not inhaling, effectively reducing the volume of the oxygen concentrator, so that it runs more efficiently, and at the same time smaller volume means lower power consumption and better portability!
In addition to medical applications, in recent years, with the improvement of people’s living standards, people are more concerned about their own health, in which oxygen therapy and oxygen health care as a new technology to enhance physical fitness and prevent diseases is gradually being accepted and promoted. Home oxygen concentrator, a new industry, has also emerged quietly and shown a strong trend of growth.
At present, home oxygen concentrator has been widely used in the treatment of cardiovascular disease, cerebrovascular disease, respiratory disease, altitude sickness and mountain sickness, geriatrics, respiratory infections in children, sleep hypoxaemia and gas poisoning hypoxia, и т. д.; it is suitable for the family, health care stations, health clinics, hospitals, convalescent hospitals, dry rest homes, beauty parlours, fitness centres, pubs, oxygen bars, guesthouses, plateau outposts, sports training centers and other places; it is the home companion for students, white-collar workers, athletes, elderly, pregnant women and fetuses for mental and physical recovery and physiological health care. It is a family companion for students, white-collar workers, athletes, the elderly, pregnant women and foetuses, и т. д., for mental and physical recovery, auxiliary treatment and physiological health care.
The WF100DPZ 2BG pressure sensor from the WFsensors series is the latest cost-effective product with temperature compensation, featuring miniaturisation, high accuracy and cost-effectiveness. The package size is in line with the international standard of 10mm x 8.5mm x 9mm and takes up little space, so it can be used in more compact PCBs or small devices. The product adopts different media compatibility pressure I2C and SPI interfaces, which is convenient for users to choose flexibly according to the actual situation. Кроме того, the high measurement accuracy of about 0.5% ФС, small error and high price ensure the highest quality level, performance and consistency of the product, which has been successfully applied to the pressure measurement of the oxygen generator mentioned above.
Oxygen Concentrator Low Pressure Alarm Detection Maintenance
Failure phenomenon:
Oxygen generator pressure has been at 21kPa, low pressure alarm long beep. Low oxygen alarm is due to the molecular sieve internal expiration or moisture caused by the machine is used to do nebulisation, not oxygen, therefore, this repair only deal with low pressure alarm fault.
Maintenance process:
1. Check the pipeline for air leakage, replace the leakage pipeline, still reported low voltage. 2.
2. Measure the pressure sensor supply voltage, supply voltage 3.3V, but after measurement found 12V voltage through the LED indicator, and then to the sensor supply voltage, sensor supply voltage should be 11V or so, obviously measure the voltage is low, replace the LED, low voltage alarm disappears.
3. Half a month later, the oxygen generator again appeared low voltage alarm, after measuring the power supply voltage 11V normal, the sensor signal amplifier circuit chip supply 12V normal, so replace the pressure sensor, the machine returned to normal, low voltage alarm disappeared.
END
The idea of repairing this fault is as follows: check whether the pipeline is leaking or not → check whether the power supply voltage is normal (including the power supply of the perceptron and the perceptron signal processing circuit) → check whether the perceptron is normal or not.
