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Why is the multi - stage cascade refrigeration cycle of ultra - low temperature equipment

Why is the multi - stage cascade refrigeration cycle of ultra - low temperature equipment

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Summary: multi-stage cascade refrigeration cycle is a representative of the traditional techniques, such as a manual transmission car; single auto-cascade technology represents a more advanced international technology, like automatic car.
single compressor self-stack system technology, a compressor from the pressure of two Time, the realization of direct output -86 temperature, the advantages of refrigeration cycle design is simple, fast cycle, cooling is also fast, the disadvantage is a single compressor cooling to -86 ℃ temperature stability is poor, when the ambient temperature is higher than 28 ℃ , In order to avoid this situation, the general use of two self-overlapping compressor separate work independently, all output -86 ℃ this temperature, the output of a single compressor, -86 deg.] C throughout the year to ensure that both reach, but also the aging of the compressor case when the failure in the refrigerator, but also independent of the other compressor robin To avoid the refrigerator suddenly stopped, damage to stored items (refer to Section Ling Wei).
It is also possible to select a single machine cycle of the compressor cascade from the art. Multi-stage cascade refrigeration refers to a high-temperature compressor connected to a low-temperature compressor to achieve a complete temperature refrigeration cycle, which is a relatively traditional technology, the advantage is the technology is mature and stable, the disadvantage is that when the equipment aging, if the compressor Damage to a situation, the other can not work, the entire device will suddenly stop, due to long maintenance cycle, easy to damage the storage items (reference Haier);
Ultra-low temperature equipment generally refers to -86 ℃ this refrigerator or freezer, the current temperature of the refrigeration system is divided into two kinds, one is a double compressor refrigeration, one is a single compressor self-cascading refrigeration.

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