Vacuum layer of liquid nitrogen tank: key technology for safeguarding ultra-low temperature environment

The core technology of the liquid nitrogen tank's ability to maintain an ultra-low temperature environment of -196 ℃ for a long time lies in its unique vacuum layer design. This seemingly simple structure actually contains precise engineering principles and materials science.

Structure and principle of vacuum layer

The liquid nitrogen tank adopts a double-layer structure design, and the interlayer space formed between the inner and outer walls is drawn into a highly vacuum state. This structure blocks heat transfer in three ways:
1. Vacuum isolation conduction: Gas molecules are extremely rare in a vacuum environment, greatly reducing thermal conduction
2. Reflective layer blocks radiation: The multi-layer aluminum plated reflective film inside the interlayer can reflect more than 90% of thermal radiation
3. Support structure optimization: Minimize thermal bridge effect with specially designed support points

Warning signal for vacuum layer failure

Users can determine whether the vacuum layer has failed by observing the following phenomena:
1. Large areas of frost appear on the outer wall of the tank
2. The consumption rate of liquid nitrogen has significantly increased (exceeding the normal value by 30%)
3. When lightly tapping the can, the sound is dull (normally a crisp echo)

Key points for maintaining the vacuum layer

Avoid severe collisions or vibrations
Prevent prolonged direct sunlight exposure
Regularly check the vacuum level (recommended every six months)
Keep the tank dry when not in use

The performance of the vacuum layer, as the "heart" of the liquid nitrogen tank, directly determines the insulation effect and service life of the equipment. Understanding its working principle and maintenance points can help users better use and maintain liquid nitrogen tanks, ensuring safe sample storage.