METHOD FOR REGULATING THE TEMPERATURE OF A MEDIUM BY MEANS OF A TEMPERATURE CONTROL LOOP, AND A TEMPERATURE-REGULATING DEVICE FOR IMPLEMENTING THE METHOD

摘要

A method for regulating the temperature of amedium and a temperature-regulating device forimplementing that method makes use of a temperaturecontrol loop which comprises a coolant circuit with acompressor arrangement (1), makes use of or contains atemperature detector (7) for generating a measuringsignal representing the temperature actual value, acomparator (10) for comparing the measuring signal withthe upper and lower limit (To, Tu) of a neutral zoneextending on both sides of a temperature desired value,and a switch mechanism (9) by which an output stage ofthe compressor arrangement (1) is switched on or off byway of two time-delay elements (11, 12) when themeasuring signal exceeds or falls below the neutralzone. One of the time-delay elements (11) is actuatedwhen the change in the measuring signal alters fromfalling to rising. The other time-delay element (12)is actuated when the change in the measuring signalalters from rising to falling. If the measuringsignal exceeds the upper limit (To) beyond the runningtime of the one time-delay element (11), an outputstage of the compressor arrangement is switched on, andif the measuring signal falls below the lower limit(Tu) beyond the running time of the other time-delayelement (12), a compressor output stage is switchedoff. In this manner, severe overswings are avoidedand a stable control within narrow limits is achieved.