Manufacturing method of alternately pre-cooling liquid nitrogen quick-freezing machine

1. The utility model relates to the technical field of quick freezing devices, in particular to a liquid nitrogen quick freezing machine that can be alternately pre-cooled.

Background technique:

2. Liquid nitrogen is inert, colorless, odorless, non-corrosive, non-flammable, and extremely low-temperature liquid nitrogen. Under normal pressure, the temperature of liquid nitrogen is

196℃, 1m3 of liquid nitrogen can expand to 696m

3 Pure gaseous nitrogen at 21°C. Liquid nitrogen (often written as ln2) is a liquid form of nitrogen formed at low temperatures. The boiling point of nitrogen is

At 196°C, liquid nitrogen will be formed if the temperature is below this under normal atmospheric pressure. If it is pressurized, liquid nitrogen can be obtained at a higher temperature. The liquid nitrogen quick-freezer can freeze the center temperature of quick-frozen items up to

18℃, quickly pass the ice crystal production zone within 30min (0

5℃ interval) in order to reduce the loss of nutrients and achieve the original taste.

3. At present, the cabinet-type liquid nitrogen quick-freezer is used. The liquid nitrogen enters the freezer compartment and is vaporized to freeze food. After a certain period of time, it is directly discharged into the air. The utilization rate of the cold capacity of the vaporized liquid nitrogen is low. The effect of freezing cannot be guaranteed.

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