After the air of the nitrogen maker is compressed by the air compressor, the pressure swing adsorption nitrogen maker enters the air storage tank after dust removal, oil removal and drying, and enters the left adsorption tower through the air intake valve and the left suction intake valve. The pressure of the tower rises, the oxygen molecules in the compressed air are adsorbed by carbon molecular sieve, and the unadsorbed nitrogen passes through the adsorption bed, and enters the nitrogen storage tank through the left suction gas valve and nitrogen gas production valve. This process is called left sucking and lasts for tens of seconds. After the completion of the left suction process, the left adsorption tower and the right adsorption tower are connected through the upper and lower pressure balancing valves, so that the pressure of the two towers reaches equilibrium, this process is called pressure balancing, and the duration is 2 to 3 seconds. After the pressure equalization is completed, the compressed air enters the right adsorption tower through the air intake valve and the right suction intake valve, the oxygen molecules in the compressed air are adsorbed by carbon molecular sieve, and the enriched nitrogen enters the nitrogen storage tank through the right suction gas valve and the nitrogen gas production valve. This process is called right suction and the duration is tens of seconds. The oxygen adsorbed by the carbon molecular sieve in the left adsorption tower is released back to the atmosphere through the left exhaust valve. This process is called desorption. On the contrary, when the left column adsorbs, the right column also desorbs. In order to completely discharge the oxygen from the decompression release nitrogen maker in the molecular sieve into the atmosphere, nitrogen is blown through a normally open reverse blow valve to purge the desorption adsorption tower, and the oxygen in the tower is blown out of the adsorption tower. This process is called reverse blowing, and it is carried out together with desorption. After the right suction is completed, enter the pressure balancing process, and then switch to the nitrogen machine left suction process, and continue the cycle.