Experimental type liquid nitrogen quick freezing simple device

Abstract

The invention relates to an experimental type liquid nitrogen quick freezing simple device, which comprises: an air pump; a sealed quick freezing chamber, which is internally provided with two temperature sensors, wherein one temperature sensor is disposed at one quick freezing chamber end close to the air pump, and the other temperature sensor is arranged at one quick freezing chamber end close to a liquid nitrogen storage tank, with a first control valve being disposed between the air pump and the quick freezing chamber, and a wind speed measurement instrument being disposed between the first control valve and the quick freezing chamber; the liquid nitrogen storage tank, which is arranged at one end of the quick freezing chamber, with a second control valve disposed between the liquid nitrogen storage tank and the quick freezing chamber; a heat-insulated pipe, which has one end communicated with the air pump and the other end passing through the quick freezing chamber and communicated with the liquid nitrogen storage tank, and is located below the temperature sensors; at least 4 liquid nitrogen outlet pipes, which are disposed in the quick freezing chamber and are respectively communicated with the heat-insulated pipe, and have outlets facing down; and a controller. The liquid nitrogen quick freezing device provided by the invention has the advantages of simple structure and excellent quick freezing effect.

Description

【Technical field】 [0001] The invention relates to a simple quick-freezing device, in particular to a simple experimental liquid nitrogen quick-freezing device. 【Background technique】 [0002] Liquid nitrogen is a colorless, tasteless, odorless, non-toxic inert gas, which has the advantage of fast freezing speed and is often used for freezing treatment of experimental items. At present, liquid nitrogen quick-freezing of experimental items often adopts liquid nitrogen spray freezing method or liquid nitrogen immersion freezing method. The main disadvantage of liquid nitrogen spray freezing is that the freezing speed is too fast, which is easy to cause cracks on the surface of the item and cannot be well To control the freezing rate of items to obtain better freezing quality of items; at the same time, the latent heat of liquid nitrogen has not been fully utilized, and the loss of liquid nitrogen is also serious. The main disadvantage of liquid nitrogen immersion freezing is t...

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Problems solved by technology

[0003] In view of the above problems, the purpose of the present invention is to provide a simple experimental liquid nitrogen quick-freezing device, which solves the problem of surface cracks, internal structure damage, and even low-temperature fracture and liquid nitrogen loss caused by the freezing speed too fast in the prior art. more questions

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