The overall operating system of the constant temperature and humidity chamber

In addition to the internal parts of the constant temperature and humidity chamber, the constant temperature and humidity chamber also has an overall system supporting the test process. It is an air circulation system, an electric appliance automatic control system and a refrigerant circulation system, which each play different roles to maintain each other. Good test results.

The air circulation system of the constant temperature and humidity chamber: the fan is responsible for drawing air from the air return port, the air passes through the evaporator (cooling, dehumidification), the humidifier and the electric heater (heating), and then is sent to the space required by the user through the air supply port, The air that is sent out mixes with the air in the space and returns to the return air.

The electric constant control system of the constant temperature and humidity box: it is divided into a power supply part and an automatic control part, 1. The power supply part supplies power through a contactor, a compressor, a fan, an electric adder, and a humidifier. 2. The automatic control part is divided into temperature and humidity control and fault protection part (temperature and humidity control are through the temperature and humidity controller, which compares the temperature and humidity of the return air with the temperature and humidity set by the user, and automatically runs. Compressor, humidifier, electric heating and other components to achieve automatic control of constant temperature and humidity.

Refrigerant circulation system of constant temperature and humidity chamber: The liquid refrigerant in the evaporator absorbs the heat of the air and starts to evaporate. Finally, the refrigerant will form a certain temperature difference with the air, and the liquid refrigerant will completely evaporate into a gaseous state. It is sucked in and compressed by the compressor, and the gaseous refrigerant absorbs heat through the condenser and condenses into a liquid. After the expansion valve is throttled, it becomes a low-temperature low-pressure refrigerant and enters the evaporator to complete the refrigerant cycle.

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