A liquid nitrogen generator is a device used to generate liquid nitrogen (Liquid Nitrogen, referred to as LN2). Liquid nitrogen is a liquid form obtained by cooling nitrogen gas (nitrogen molecules at normal temperature and pressure) below its boiling point (-196°C). The liquid nitrogen generator separates, compresses, cools and liquefies the nitrogen in the air through physical or chemical methods to produce high-purity liquid nitrogen. Liquid nitrogen is widely used in many fields, such as laboratory research, industrial production, food refrigeration, medical refrigeration, superconductor refrigeration, etc.

There are many working principles of liquid nitrogen generators, and the common types are as follows:

1. Membrane separation type liquid nitrogen generator: uses special membrane materials to separate nitrogen and oxygen, and cool the nitrogen to liquefaction temperature.

2. Compression cycle liquid nitrogen generator: Cool the gas to liquid nitrogen temperature through compression, cooling and liquefaction cycles.

3. Deoxidizer type liquid nitrogen generator: utilizes chemical reactions to react oxygen and nitrogen to generate nitrogen compounds, which are then decomposed through pyrolysis or other methods to generate high-purity liquid nitrogen.

The service life of a liquid nitrogen generator depends on several factors, including the quality of the equipment, operating conditions and maintenance. Generally speaking, a liquid nitrogen generator that is used normally and properly maintained can provide long-term stable operation and a service life of several years or even longer. However, if the equipment is improperly used or poorly maintained, it may cause equipment failure or performance degradation, thereby affecting its service life. Therefore, regular maintenance and upkeep is essential to extend the service life of your liquid nitrogen generator.