Refrigerated dryer with electronic bypass type energy adjusting function

Abstract

The invention relates to a refrigerated dryer with an electronic bypass type energy adjusting function. The refrigerated dryer comprises a compressor, a condenser, a first filter, a second filter, a thermal expansion valve and an evaporator. The compressor is connected with one end of the condenser. The other end of the condenser is connected with one end of the thermal expansion valve through the second filter. The other end of the thermal expansion valve is connected with one end of the evaporator. The refrigerated dryer further comprises an electronic expansion valve and a refrigerant evaporator outlet temperature probe. The refrigerant evaporator outlet temperature probe is arranged at the position of the outlet of the evaporator. The third end of the thermal expansion valve and one end of the electronic expansion valve are connected to a gas suction pipe of the compressor. The other end of the electronic expansion valve is connected with the one-fourth to one-fifth portion of the upper half portion of the condenser through the first filter. The opening degree of the electronic expansion valve is controlled by an electronic expansion valve controller. The aims of adjusting the gas exhaust amount of the compressor and raising the evaporating pressure and the evaporating temperature are achieved, and normal running of a unit is ensured.

Description

technical field [0001] The invention relates to a freeze dryer, in particular to a circuit structure of the freeze dryer. Background technique [0002] The refrigerated dryer consists of a refrigeration system and a gas system. The refrigeration system is composed of compressor, condenser, expansion valve, energy regulating valve, evaporator and other components. Compressed air comes out of the air compressor, flows through the evaporator, and exchanges heat with the evaporator. The unit separates the moisture in the compressed air through the refrigeration cycle, and then discharges it to the outside. In actual operation, because the amount of compressed air used will sometimes be more and sometimes less, when the amount of compressed air used decreases, the thermal load will also decrease. At this time, the unit cannot be stopped, otherwise the effect of water removal will not be achieved, but when the unit is still running at 100% capacity, the cooling capacity must be t...

AI Technical Summary

Problems solved by technology

The unit separates the moisture in the compressed air through the refrigeration cycle, and then discharges it outdoors. In actual operation, because the amount of compressed air used is sometimes more and sometimes less, when the amount of compressed air used decreases, the heat load also becomes smaller. At this time, the unit cannot be stopped, otherwise the effect of water removal will not be achieved, but when the unit is still running at 100% capacity, the cooling capacity will inevitably be too large, so that the evaporation will not be complete, resulting in a decrease in the evaporation pressure and temperature. When it is lower than 0 degrees, the condensed water in the evaporator will freeze, which will cause the evaporator to be damaged and cracked by freezing

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