Small liquid nitrogen generators are miniaturized cryogenic liquefaction equipment integrating air separation, cryogenic refrigeration, and liquid nitrogen storage, which can directly convert atmospheric air into high-purity liquid nitrogen on site, replacing traditional bottled liquid nitrogen purchasing and transportation modes. They are widely used in laboratory scientific research, biomedical cryopreservation, small-scale food quick freezing, mechanical precision cooling, and low-temperature testing scenarios. The core output parameters of small liquid nitrogen generators mainly include daily liquid nitrogen output, liquid nitrogen purity, liquefaction temperature, working pressure, and energy consumption per unit output, which determine the application scope and operational economy of the equipment. Different from large industrial cryogenic liquid nitrogen production equipment, small liquid nitrogen machines are designed for decentralized small-demand scenarios, with compact structure, low energy consumption, simple operation, and no need for professional cryogenic operation technology, realizing autonomous and convenient liquid nitrogen supply for users.
The key output yield parameters of small liquid nitrogen generators are classified by daily production capacity, covering multiple models to meet different user demands. The micro small liquid nitrogen generator has a daily output of 5 to 20 liters, which is suitable for small laboratories and biomedical laboratories with low liquid nitrogen consumption, meeting the daily cryopreservation of biological samples and conventional low-temperature experimental demand. The conventional small model has a daily liquid nitrogen output of 20 to 100 liters, which is the most widely used model, applicable to medium-sized laboratories, small food processing enterprises, and precision machinery cooling links, with balanced yield and energy consumption. The enhanced small liquid nitrogen generator has a daily output of 100 to 300 liters, which can meet the continuous liquid nitrogen demand of small-scale industrial low-temperature processing and batch sample cryopreservation. All models of small liquid nitrogen generators can achieve stable liquid nitrogen output with purity above 99.99%, and the high-purity model can reach 99.999%, ensuring no impurity interference in low-temperature experiments and precision processing.
In addition to yield and purity, the operating parameter performance of small liquid nitrogen generators ensures their practical application value in multiple scenarios. The equipment adopts advanced cryogenic refrigeration and air separation technology, with a stable liquefaction temperature of -196°C, which is consistent with the standard liquefaction temperature of liquid nitrogen, ensuring the quality and low-temperature performance of produced liquid nitrogen. The working pressure is stably controlled between 0.8MPa and 1.6MPa, with safe and controllable operating pressure and no overpressure risk. In terms of energy consumption, the optimized small liquid nitrogen machine has low power consumption, with the energy consumption per liter of liquid nitrogen far lower than the cost of purchased bottled liquid nitrogen, with significant economic advantages. The equipment supports 24-hour uninterrupted liquefaction operation, with automatic liquid level monitoring and automatic start-stop functions. When the storage tank liquid level reaches the upper limit, the equipment automatically stops working, and when the liquid level drops to the lower limit, it automatically starts liquefaction, realizing unattended intelligent operation. At the same time, the equipment is equipped with perfect safety protection parameters such as overpressure protection, low-temperature protection, and fault alarm, ensuring safe and stable operation in long-term daily use.
