Does the refrigerant affect the temperature inside the high and low temperature test chamber?

Generally, it can be judged whether the flow rate of the throttle valve refrigerant is appropriate by observing the evaporation pressure, the evaporation temperature, and the frosting condition of the suction pipe. Blockage of the throttle valve is an important factor affecting the flow rate of the refrigerant. The main cause of the blockage of the throttle valve is ice blockage and dirty blockage.

The technician believes that the ice blockage in the high and low temperature test chamber compressor is due to the poor drying effect of the dryer. The refrigerant contains moisture. When flowing through the throttle valve, the temperature drops below 0 °C, and the moisture in the refrigerant forms ice. The throttle valve hole is blocked; the dirty blockage is due to the accumulation of more dirt on the filter inlet of the throttle valve, and the refrigerant flow is not smooth and forms a blockage.

Insufficient refrigerant in the system, insufficient cooling capacity

There are two main reasons for the lack of refrigerant circulation in the high and low temperature test chambers. First, the refrigerant charge is insufficient. In this case, it is only necessary to fill in a sufficient amount of refrigerant. Another reason is that the system refrigerant leaks more. In case of such a situation, the leak point should be found first, and the connection points of each pipeline and valve should be checked. After the leak is repaired, a sufficient amount of refrigerant is charged.

The efficiency of the compressor in the high and low temperature test chamber is low, and the cooling capacity cannot meet the load requirement in the test chamber.

Due to the long-term operation of the compressor, the components such as the cylinder liner and the piston ring are seriously worn, the clearance is increased, the sealing performance is reduced, the gas transmission coefficient of the compressor is also reduced, and the cooling capacity is reduced. When the cooling capacity is less than the heat load of the warehouse, it will cause the warehouse temperature to drop slowly. The refrigeration capacity of the compressor can be roughly judged by observing the suction and exhaust pressure of the compressor. If the refrigeration capacity of the compressor drops, the common method is to replace the cylinder liner and piston ring of the compressor. If it still does not work after replacement, other factors should be considered, and even disassemble and repair should be taken to eliminate the fault factor.