Liquid nitrogen tank temperature control system revealed: how to maintain low temperature stability?

The core function of a liquid nitrogen tank is to store and maintain liquid nitrogen at a low temperature (-196 ℃), preventing rapid evaporation or temperature fluctuations. To achieve this goal, the liquid nitrogen tank is equipped with a precision temperature control system, including a vacuum insulation layer, low-temperature materials, sealing structure, and pressure regulating device. Next, let's uncover how liquid nitrogen tanks maintain low temperature stability.

1. Vacuum insulation layer: prevents heat conduction
The liquid nitrogen tank adopts a double-layer structure design, forming a high vacuum insulation layer between the inner and outer layers. The vacuum layer can effectively prevent heat from entering the tank through air convection and heat conduction, thereby reducing the evaporation rate of liquid nitrogen. Some high-end liquid nitrogen tanks also use multi-layer insulation barriers to further enhance the insulation effect.

2. Low temperature materials: reduce heat loss
The body of a liquid nitrogen tank is usually made of high-strength aluminum alloy or stainless steel materials, which are not only resistant to low temperatures but also reduce heat transfer. In addition, some liquid nitrogen tanks are coated with a special reflective layer inside, which can reflect external thermal radiation and further reduce temperature fluctuations.

3. High sealing performance: prevents loss of cooling capacity
Good sealing performance is crucial for maintaining the low temperature of liquid nitrogen tanks. High quality liquid nitrogen tanks use low-temperature resistant sealing rings and tight lid designs to ensure that liquid nitrogen is not easily evaporated and to prevent temperature rise inside the tank. At the same time, the sealing structure can prevent external moisture from entering and reduce frost formation.

4. Pressure regulation system: Balance internal temperature
The evaporation of liquid nitrogen produces gas, causing an increase in pressure inside the tank. Some liquid nitrogen tanks are equipped with automatic pressure relief valves. When the pressure exceeds the safe range, an appropriate amount of nitrogen is released to avoid affecting temperature stability due to excessive pressure.

conclusion
The liquid nitrogen tank can maintain low temperature stability, relying on the synergistic effect of vacuum insulation layer, low-temperature materials, sealing structure, and pressure regulation system. These designs not only extend the storage time of liquid nitrogen, but also ensure the safety and efficiency of the equipment. When choosing liquid nitrogen tanks, users should pay attention to these key temperature control technologies to ensure the stability of long-term low-temperature storage of liquid nitrogen.