There are many kinds of cryogenic storage containers, but the more popular ones are liquid nitrogen canisters!
It is not limited by electricity, unlike a refrigerator, and requires only enough liquid nitrogen to maintain a deep low temperature of -196°C.
It is also possible to choose the model according to the number of samples.
Do you know its principle structure?
The principle of liquid nitrogen canisters is simply summarized as “vacuum insulation”!
By absorbing liquid nitrogen into a thick layer of water-repellent material, the material around the inner liner of the container, so that the temperature in the inner liner to maintain a low temperature of -196 ℃.
Outside the inner liner, the outer liner, pumping for the vacuum, some similar to the thermos cup, thermos bottle, double-layer structure, the vacuum between the inner and outer layers, this part of the vacuum and water-repellent materials work together to achieve “insulation”.
Structure design with product principle, the structure of liquid nitrogen canister consists of outer shell (outer liner), inner liner, vacuum sandwich, neck tube and neck plug.
The housing is visible to the naked eye, attached to the mouth of the can and made of aircraft aluminum alloy.
The inner chamber is the storage area for liquid nitrogen and samples, with a base that holds the carrying tube holding the samples.
Vacuum sandwich, between the inner and outer liner, equipped with adsorption and insulation materials, in the state of vacuum.
Neck tube, made of fiberglass, connecting the liner to the shell, slender shape.
A neck plug, designed to fit the neck tube and leave a slit for exhaust.
The liquid nitrogen canister structure is designed according to the principle, and it is also the principle structure to do a good job of freezing samples.