Vertical ultralow-temperature freezer

Abstract

The invention discloses a vertical ultralow-temperature freezer. The vertical ultralow-temperature freezer comprises a vertical freezer body, wherein a cooler is arranged in the vertical freezer body, and a nitrogen refrigerating mechanism is arranged at the vertical freezer body; the nitrogen refrigerating mechanism comprises a high-speed motor, a turbine compressor, an aftercooler, a first heat regenerator, a second heat regenerator and an expansion machine; the first heat regenerator and the second heat regenerator are connected in series; the high-speed motor drives the turbine compressor, the other end of a power shaft extends into the expansion machine and is connected with an impeller, and an air outlet of the turbine compressor is connected with an inlet of the aftercooler; an outlet of the aftercooler is connected with the first heat regenerator, and a high-temperature outlet of the second heat regenerator is connected with an inlet of the expansion machine; an outlet of the expansion machine is connected with an inlet of the cooler, and an outlet of the cooler is connected with a low-temperature inlet of the second heat regenerator; and a low-temperature outlet of the second heat regenerator is connected with an air inlet of the turbine compressor. An aluminum tube bank, fins, heat exchange tooth edges and the cooler are specifically arranged, so that the temperature in the vertical freezer body can be quickly and uniformly reduced, defrosting is not needed for a long time, and nitrogen can be supplemented in time.

Description

technical field [0001] The invention relates to the field of refrigeration technology, in particular to an ultra-low temperature vertical freezer, which was invented by Henan Xinfei Refrigeration Equipment Co., Ltd. A low temperature box. Background technique [0002] At present, low-temperature boxes below -86°C usually use two-stage or three-stage simple cascade refrigeration or mixed refrigerant natural cascade refrigeration. Simple cascade refrigeration requires at least two sets of refrigeration cycles to work together, with complex structures and poor reliability. Maintenance and maintenance is difficult. [0003] However, the natural cascade refrigeration system uses a mixed working fluid, so the control system is relatively complicated, and once the mixed working fluid leaks, the refrigerant composition will change, which will have a great impact on the cooling effect and cannot be supplemented. The agent is all drained and added again, and the horizontal freezer h...

AI Technical Summary

Problems solved by technology

[0002] At present, low-temperature boxes below -86°C usually use two-stage or three-stage simple cascade refrigeration or mixed refrigerant natural cascade refrigeration. Simple cascade refrigeration requires at least two sets of refrigeration cycles to work together, with complex structures and poor reliability. Maintenance and maintenance difficulties

[0003] However, the natural cascade refrigeration system uses a mixed working fluid, so the control system is relatively complicated, and once the mixed working fluid leaks, the refrigerant composition will change, which will have a great impact on the cooling effect and cannot be supplemented. If all the agents are drained and added again, the horizontal freezer has the disadvantage of inconvenient storage

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