Liquid nitrogen tank is an ultra-low temperature storage device in the fields of biomedical, agricultural breeding, and scientific research, mainly used for long-term preservation of biological samples such as cells, tissues, vaccines, stem cells, etc. Its core function is to provide and maintain a stable -196 ℃ extremely low temperature environment, ensuring that biological activity is not lost over a long period of time.
Core structure and equipment characteristics
A typical liquid-phase liquid nitrogen tank consists of an inner and outer double-layer shell, with a high vacuum multi-layer insulation material in the middle, greatly reducing heat conduction. Narrow neck design can effectively reduce liquid nitrogen evaporation loss. Modern liquid nitrogen tanks are equipped with intelligent monitoring systems that can display real-time liquid level, temperature, and inventory information. Some models also have automatic replenishment functions.
Detailed explanation of working principle
Low temperature maintenance mechanism: The tank is filled with liquid nitrogen and utilizes its boiling point of -196 ℃ at atmospheric pressure to maintain a constant low temperature environment through continuous vaporization and heat absorption of liquid nitrogen.
Sample protection design: Samples are usually stored in the gas phase area or immersed in the liquid phase. Gas phase storage can avoid cross contamination, while liquid phase storage ensures more uniform and stable temperature.
Thermal insulation principle: Vacuum interlayer eliminates gas convection and heat conduction, multi-layer reflective materials block radiation heat transfer, and special neck tube design reduces cold loss.
Technological progress and safety standards
The new generation liquid nitrogen tank adopts lightweight materials such as aviation aluminum alloy, and optimizes the insulation structure, extending the static storage time to over 300 days. Strictly follow the operating procedures when using, including wearing antifreeze equipment, ensuring good ventilation, avoiding excessive sealing, etc., to prevent frostbite and oxygen deficiency risks.
The liquid nitrogen tank, as the core equipment for ultra-low temperature storage, provides a crucial foundation for life science research and the development of biomedicine with its exquisite thermodynamic design and continuously improved safety system.