The leak detection of the constant temperature and humidity test chamber refrigeration system mainly includes two parts: the first part is the leak detection of the refrigeration compressor, the condenser, the evaporator, the dry filter, the capillary tube, etc. The second part is the closed system composed of the refrigeration pipeline. Leak detection. So what are the methods for leak detection in the constant temperature and humidity test chamber refrigeration system? Let's take a look.
1, soap bubble leak detection
The soap is first sliced ​​and immersed in warm water to dissolve it into a thick soapy liquid. When leaking, use a gauze to wipe off the stain on the part to be inspected. Dip the soapy liquid with a clean brush and evenly spread it around the part to be inspected. Observe the presence or absence of air bubbles. If soap bubbles appear, it indicates a leak. Sometimes, the system needs to be charged with 0.8-1.0 MPa (8-10 kgf/cm2) of nitrogen.
2, water leak detection
This method is often used for leak detection of constant temperature and humidity test chamber compressors (note that the terminals should be waterproof), evaporators, condensers and other components. The method is: the evaporator should be filled with 0.8Mpa nitrogen, the condenser should be filled with 1.9MPa nitrogen (for heat pump type air conditioner, both should be filled with 1.9MP nitrogen), immersed in warm water of about 50 degrees, carefully Observe whether or not bubbles have occurred. The purpose of using warm water is to reduce the surface tension of water, because the lower the temperature of water, the greater the surface tension, and the small leakage cannot be detected. The leak detection site should have sufficient light and calm water. The observation time should be no less than 30 seconds, and the workpiece should preferably be immersed below the water surface by 20 cm. After the water immersion leak detection, the parts should be dried before repair welding.
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