The thermal shock tester refrigeration system blocking explanation

The thermal shock tester is generally composed of compressor, air conditioner evaporator, cooler and piping system software. There are generally two types of blockages in the refrigeration system: dirty blockages and ice blockages, and oil blockages are relatively rare.

1. Dirty blockage

When the compressor of the thermal shock tester is damaged and there is waste in the refrigeration system, this waste is very easy to block in the capillary or filter device, which is called dirty block. Dirty blockage is due to the presence of debris in the refrigeration system (scale, copper filings, weld penetrations) that clog the capillaries or filters when it circulates with the refrigerant.

Dirty blockage removal method: use gas cutting to remove the capillary, filter device, cooler and air conditioner evaporator, replace the carbon molecular sieve in the capillary tube and filter device, clean the cooler and air conditioner evaporator, carry out drying, vacuum packaging, and then weld on. Charge with refrigerant.

2. Ice block

Ice blockage is caused by the entry of moisture into the refrigeration system of the thermal shock tester. The f-12 itself has a certain amount of moisture. In the process of overhauling or adding refrigerant, moisture and gas enter the system software. Under the ultra-high pressure function of the compressor, the refrigerant changes from liquid to vapor state, so that moisture will With the refrigerant circulation system into the narrow and long capillary. When the moisture content per kilogram of refrigerant exceeds 20mg, the filter device is saturated with moisture and cannot be filtered out. When the temperature of the inlet and outlet of the capillary reaches 0°C, the moisture is converted from the refrigerant and becomes ice, producing ice blocking.

3. Oil plug

The compressor cylinder block is seriously worn or the clearance between the piston and the cylinder is too large.