Quality judgment and main use of liquid nitrogen dewar
Liquid nitrogen tanks can be generally divided into liquid nitrogen storage tanks and liquid nitrogen transport tanks. The storage tank is mainly used for the static storage of indoor liquid nitrogen. The liquid nitrogen tank should not be used for long-distance transportation under working conditions; the liquid nitrogen transport tank has designed a special anti-shock design in order to meet the transportation conditions. In addition to being able to store and store external items, it can also be used for transportation under the condition of filling liquid nitrogen, but it should also avoid severe collision and vibration. 1. During the use of the can, the use of the can should be checked every day. On the premise that there is liquid nitrogen in the can, it is found that there are water drops or frost on the top and the top of the can, indicating that there is a problem with the quality of the can. Stop using immediately; 2. When the bottle cap and the upper waterless beads or frosting phenomenon, touch the shell by hand, feel the upper part is cold, the lower part is hot, indicating that there is some problem with the quality of the jar, that is, the daily increase of liquid nitrogen is large. It should be observed that after the loss of liquid nitrogen is prevented, the stored substances are damaged. If necessary, it is best to stop using them; if the upper and lower temperatures are the same, the quality of the cans is not problematic. 3. After opening the cork, the mist in the bottle mouth does not overflow, but sinks, indicating that the jar is good. 4. Use the ear to hear the sound of bubbles in the jar from the mouth of the bottle. If it is more frequent, there is a problem with the quality of the can. Otherwise, there is no problem.
1. Active preservation of animal semen. It is mainly used for the preservation of semen from excellent breeds such as cattle and sheep, as well as semen from animals, as well as long-distance transportation and storage. 2. Activity preservation of biological samples. Vaccines, bacterial strains, cells, and human and animal organs in the biomedical field can be immersed in liquid nitrogen stored in a liquid nitrogen tank for long-term active storage. When it is needed, take out the thawing and rewarming and use it. 3. Cryogenic treatment of metal materials. The cryogenic treatment of the metal material by the liquid nitrogen stored in the liquid nitrogen tank can change the metallographic structure of the metal material and significantly improve the hardness, strength and wear resistance of the metal material. 4. Cryogenic assembly of precision parts. After the precision parts are cryogenically treated with liquid nitrogen, assembly is performed to improve the assembly quality of the parts, thereby improving the overall performance of the equipment or the instrument. 5. Refrigeration and freezing in the medical and health industry, medical surgical refrigeration.
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