The cryogenic test chambers are different according to the cold treatment method. The equipments are dry ice processing equipment, Freon refrigerator (low temperature test box), air turbo expansion chiller, open liquid nitrogen tank, liquid nitrogen cryogenic cryogenic test box. Here are the performance comparisons of the cold treatment methods for the above devices:
Dry ice processing equipment: minimum processing temperature -78 °C; can not handle the temperature; can not control the cooling rate; workpiece temperature stress by the large; discharge of waste cold coal such as alcohol or acetone; equipment, simple structure, labor intensity, process can not be adjusted.
Freon freezer (low temperature test chamber): minimum processing temperature -70°C; ability to handle temperature; able to control the cooling rate; less temperature differential stress on the workpiece; discharge of waste cold freon coal, leakage pollution; equipment structure is complex, The pipes are easy to block, leak, and have large maintenance.
Air turbo expansion chiller: minimum processing temperature -130°C; ability to handle temperature; ability to control the cooling rate; workpieces with little temperature difference stress; no pollution to the environment; equipment structure is complex, semi-automatic control.
Open liquid nitrogen tank: minimum processing temperature -196 °C; can not handle the temperature; can not control the cooling rate; the workpiece by the maximum temperature differential stress; no pollution to the environment; equipment structure is simple.
Liquid nitrogen cryogenic cryogenic test chamber: minimum processing temperature -196°C; ability to handle temperature; able to control the cooling rate; the workpiece by the temperature difference stress; no pollution to the environment; equipment structure semi-automatic control.
