Low temperature environment control system

The utility model discloses a low temperature environment control system, including condenser, evaporimeter and compressor, the gas outlet of compressor feeds through the admission line of evaporimeter through the pipeline of giving vent to anger with condenser intercommunication, the pipeline of giving vent to anger of compressor, is equipped with solenoid valve C2 on the admission line of evaporimeter, and the pipeline of giving vent to anger of evaporimeter passes through the income gas port of the income gas port of back flow intercommunication compressor, the pipeline intercommunication evaporimeter of giving vent to anger of condenser, the utility model discloses an utilize refrigerating system steam and air conditioning to get into the evaporimeter in turn to be furnished with can self -closing the solenoid valve control, transport that can self -closing air conditioning when appointed cryogenic temperature reachs is opened the steam solenoid valve and is made the evaporimeter get into steam for temperature in the control box, to reach energy -conserving effect and make the temperature control error littleer, more accurate with the reduction energy consumption. Environmental control system pipeline subsection is simple, and control is convenient, is fit for the test of various low temperature environment and uses.