1. The reason why the refrigerator compressor needs to be charged to detect leaks: The atmospheric pressure is 0.1 MPa. Pressurization is to increase the pressure in the compressor system, and the gas will go from high pressure to low pressure, so lower it. the system connection pipe in soapy water. , if there are bubbles, it means there is an air leak. Here is the specific method:
(1) When the pressure of the vacuum gauge rises to 0.8~. 1.0 MPa, first seal the return pipe with a nut pipe opening to prevent air from entering the compressor from here, then cut off the power supply
(2) Use a brush dipped in soapy water to coat the pipe joints to see if there are any bubbles. If there are bubbles, it means there is an air leak and the nuts at the connection should be tightened until there is no more leaking.ite.
(3) If there is no air leak at the pipeline connections, if the pressure value on the vacuum pressure gauge does not change after 15 minutes of waiting , this means that the refrigerator's refrigeration system is airtight. .
2. Suction involves drawing air from the system, primarily moisture from the air. If the air is not cleaned and refrigerant is added, impurities and moisture in the air will block the capillaries. ice blockage or moisture. Compressor corrosion, etc.
This is because the leak area is too small and the leak is slow. So I vacuumed it and found no leaks.
With pressure, the pressure can reach a very high level, then the pipeline leaks quickly, and the pressure gauge can detect the pressure decrease, thereby detecting the leak.
General tests use the pressure method, spraying soapy water onto the suspect areaor by immersing it in a swimming pool to observe if it bubbles.