The blockage of the refrigeration system of the high and low temperature damp heat test chamber is generally divided into two cases: ice block and dirty block.
If the refrigerant contains a certain amount of water, the water circulates with the refrigerant in the system. When it is circulated to the outlet of the capillary, the refrigerant quickly evaporates at a lower temperature due to the pressure reduction, but the water will form ice. Ice plugs often occur at the junction of the capillary and the evaporator. After the ice blockage occurs, the refrigerant cannot circulate, and the temperature in the high-low temperature damp heat test chamber rises, and the frost on the evaporator melts. When the temperature inside the box rises to a certain extent, the small ice cubes in the ice block will melt, the pipeline will be smooth, and the refrigerant can be normally circulated and cooled, so the evaporator starts to frost again. When the temperature drops to a certain level, the refrigerant The water freezes again at the capillary exit and ice blockage occurs. This periodic frosting and defrosting phenomenon is an ice blockage failure.
Ice plug removal method: When a slight ice block occurs, hot towel can be used to heat the capillary outlet or use alcohol cotton ball to ignite the baking, which can eliminate the ice blockage, the refrigerant starts to flow, and there is a “嘶嘶†flow sound. If ice jams occur frequently, the refrigeration system should be dismantled, the parts dried and evacuated, and the refrigerant refilled. Note that it is not advisable to add methanol to the refrigeration system. The fundamental measure to solve the ice block is to completely evacuate the dry and inject qualified refrigerant.
The following small series will explain the phenomenon of the dirty plugging of the high and low temperature damp heat test chamber and the solution, so stay tuned!
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