Defrosting device for saloon car air-condition evaporator

Abstract

The car air conditioner evaporator defroster includes compressor, condensator, liquid storage, electronic expanding valve, evaporator blower, evaporator, evaporator outlet temperature sensor, evaporator inlet temperature sensor, A / D converter, program memory, drive circuit for electronic expanding valve and microprocessor. The throttle mechanism adopts electronic expansion valve. When the evaporator has surface temperature lower than the set temperature, the microprocessor will send command to increase the number of pulse to the electronic expanding valve for increased opening, raised evaporation pressure and raised evaporator surface temperature and the frost will thaw without stopping the air conditioner. The present invention can avoid the frequent start of the compressor, and this reduces power consumption, raises system stability and facilitates the intelligent control of the air conditioner.

Description

technical field [0001] The invention relates to a defrosting device for an evaporator of a car air conditioner, in particular to a defrosting device that uses an electronic expansion valve as a throttling mechanism, controls the surface temperature of the evaporator by controlling the opening of the electronic expansion valve, and realizes non-stop defrosting of the evaporator defrosting device. The utility model belongs to the technical field of car air conditioners. technical background [0002] Car air-conditioning system is mainly composed of compressor, condenser, evaporator, liquid receiver and throttling mechanism and other components. Common throttling components are thermal expansion valves and throttle spools, but both thermal expansion valves and spools share limitations. That is, once the structure is determined, its control target parameters and control laws have been determined and cannot be changed. No matter what the object is, they all work in the same wa...

AI Technical Summary

Problems solved by technology

After the compressor stops, the surface temperature of the evaporator rises, and the frost gradually melts; when the surface temperature of the evaporator is higher than a certain temperature value (generally 4°C), the electromagnetic clutch connects the compressor and starts cooling, so that the compressor is started frequently, On the one hand, it has a great impact on the car engine, on the other hand, it has a great impact on the comfort, energy saving and compressor life of the car air conditioner, especially when the heat load in the car cabin is small and the evaporator Under the condition of large cooling capacity, the frequency of compressor start-up is more frequent, and the harm caused is even greater

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