Cascade refrigerating unit with double evaporation temperatures

The utility model relates to the technical field of refrigeration equipment, and provides a cascade type refrigerating unit with double evaporation temperatures, which comprises a bearing platform, a heat exchanger; the high-temperature-stage refrigeration cycle system is installed on the bearing platform, and the high-temperature-stage refrigeration cycle system comprises a first screw compressor, a condenser and a first expansion valve; and the low-temperature-stage refrigeration cycle system is installed on the bearing platform, and the low-temperature-stage refrigeration cycle system comprises a liquid reservoir, a second expansion valve, a first evaporator, a third expansion valve, a second evaporator, a second screw compressor and an oil separator. The cascade refrigerating unit with the double evaporation temperatures can be applied to refrigerating occasions with different evaporation temperatures and is low in energy consumption. 本实用新型涉及制冷设备技术领域，提供了一种具有双蒸发温度的复叠式制冷机组，包括：承重平台；换热器；高温级制冷循环系统，高温级制冷循环系统安装在