The expansion valve is one of the four major components of the programmable high and low temperature damp heat test box refrigeration system. It is an important device for regulating and controlling the flow and pressure of refrigerant into the evaporator, and it is also the "boundary line" on the high and low pressure side. Its adjustment is not only related to the normal operation of the entire programmable high and low temperature humid heat test box refrigeration system, but also an important indicator to measure the level of operator technology.
The adjustment of the expansion valve must be carried out carefully and patiently. The adjustment pressure must pass through the heat exchange boiling (evaporation) of the evaporator and then enter the compressor suction chamber through the pipeline to be reflected on the pressure gauge. It takes a time process. Every time the expansion valve is mobilized, it usually takes 10 to 15 minutes to stabilize the adjustment pressure of the expansion valve on the suction pressure gauge.
The suction pressure of the compressor of the programmable high and low temperature damp heat test chamber compressor is an important reference parameter for the pressure adjustment of the expansion valve. The opening degree of the expansion valve is small, the flow rate of the refrigerant is less, and the pressure is low; the opening degree of the expansion valve is large, the flow rate of the refrigerant is more, and the pressure is also higher. According to the thermodynamic properties of the refrigerant, the lower the pressure, the lower the corresponding temperature; the higher the pressure, the higher the corresponding temperature. According to this law, if the outlet pressure of the expansion valve is too low, the corresponding evaporation pressure and temperature are also too low. However, due to the decrease in the flow rate into the evaporator and the decrease in pressure, the evaporation rate is slowed, the cooling capacity per unit volume (time) decreases, and the cooling efficiency decreases.
In order to reduce the pressure and temperature loss after the expansion valve is adjusted, the expansion valve should be installed on the horizontal pipeline at the entrance as much as possible. The temperature sensor should be wrapped around the central position of the side of the return air pipe (low pressure pipe). When the expansion valve is working normally, the frost of the valve body is inclined, and the frost should not be on the inlet side, otherwise it should be considered that there is ice or dirty clogging in the inlet filter. Under normal circumstances, the expansion valve is very quiet when it is working. If there is a more obvious "silk" sound, it means that the refrigerant in the system is insufficient. The expansion valve should be replaced when it has malfunctions such as air leakage and adjustment failure of the temperature sensing system.
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