A control method for a cascade ultra-low temperature refrigerator

Abstract

The invention discloses a control method for a cascade ultra-low temperature refrigerator, which includes: detecting the real-time temperature T in the refrigerator; The real-time temperature T controls the start and stop of the high-temperature compressor and the low-temperature compressor in the refrigerator, so that the real-time temperature T in the refrigerator reaches the set value of the temperature in the box; when the following conditions are met at the same time, the low-temperature compressor is started: the high-temperature compressor has been started and the working time is long ≥The shortest working time of the high-temperature compressor for the second-stage refrigeration; the real-time temperature value of the high-temperature evaporator ≤ the minimum temperature value of the high-temperature evaporator when the low-temperature compressor is turned on; the real-time temperature T of the refrigerator ≥ the set value of the temperature in the box + the upper deviation of the low-temperature compressor .

Description

technical field [0001] The invention relates to the field of refrigerator control, in particular to a method for controlling a cascade ultra-low temperature refrigerator. Background technique [0002] The control method usually adopted in the field of refrigerator refrigeration is: after the power is turned on, the condensing fan rotates normally and after the compressor start-up delay, when the temperature detection value in the box is > St + the upper deviation of the start-up low-temperature compressor, the high-temperature compressor is turned on, and the delay Turn on the low-temperature compressor after 30 seconds; when the temperature detection value in the box is <St-turn off the lower deviation of the low-temperature compressor, then turn off the high-temperature and low-temperature compressors at the same time. Defects of the current existing technology: after power on, the condensing fan rotates constantly, which causes a waste of electric energy; when contr...

AI Technical Summary

Problems solved by technology

Defects of the current existing technology: the condensing fan rotates frequently after power-on, which causes a waste of electric energy; when controlling the high- and low-temperature compressors, the high-temperature compressor has not yet reached the best condensation effect, and when the low-temperature system is condensed , the low-temperature compressor starts, which causes poor cooling effect and wastes electric energy; if the high-temperature and low-temperature compressors stop at the same time, it will have an impact on the unit and cause a bad hidden danger to the safety and reliability of the refrigeration system

Images