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    Five methods for leak detection in refrigeration systems

    Five methods for leak detection in refrigeration systems The leak detection of the refrigeration system of the air conditioner includes the leak detection of components such as the refrigeration compressor, condenser, evaporator, filter drier, capillary (or expansion valve) and the closed system of the refrigeration pipeline. The leak detection methods are: soap bubble leak detection, water leak detection, pressure leak detection, hand oil leak detection, and halogen lamp leak detection. Five methods for leak detection in refrigeration systems ⑴Soap bubble leak detection First cut the soap into thin slices and soak it in warm water to dissolve it into a thick soapy liquid. During the leak detection, wipe the stain with gauze on the test site, use a clean brush to dip the soap liquid, and evenly apply it around the test site. Carefully observe whether there are air bubbles. If soap bubbles appear, it indicates that there is a leak. Sometimes, the system needs to be filled with 0.8-1.0Mpa (8-10kgf / cm2) nitrogen first. ⑵Water leak detection This method is often used for leak detection of components such as compressors (note that the terminals should be protected against water), evaporators, and condensers. The method is: the evaporator should be filled with 0.8Mpa nitrogen, the condenser should be filled with 1.9MPa nitrogen (for heat pump air conditioners, both should be filled with 1.9MP nitrogen), immersed in warm water at about 50 degrees, carefully Observe if any bubbles occur. The purpose of using warm water is to reduce the surface tension of the water, because the lower the temperature of the water, the greater the surface tension, and tiny leaks cannot be detected. The leak detection site should be well lit and the water surface should be calm. The observation time should be no less than 30 seconds, and the workpiece should be submerged below 20 cm. The parts after water leak detection should be dried before repair welding. ⑶ Pressure leak detection After the refrigeration system has been repaired and welded, before charging the refrigerant, it is best to charge 1.5Mpa nitrogen and close the three-way maintenance valve (the valve itself must not leak) when it is close to work. Waiting for work the next day, if the gauge pressure does not drop, it means that the repaired refrigeration system is not leaking. If the gauge pressure drops, there is a leak, and then use the soap bubble leak detection method. ⑷Detect oil leak detection The refrigerant of the air conditioner is mostly R22. R22 has a certain miscibility with the freezing oil. When R22 leaks, the freezing will also seep or drip out. Using this feature, you can determine whether there is a leak by visual inspection or touching the oil. When there is less leakage and it is not obvious to touch with your fingers, you can wear white gloves or white paper to touch the suspicious place, and you can also find the leak. ⑸Halogen lamp leak detection The flame color changes from light green → dark green → purple, and the amount of leakage is from microleakage → severe leakage. ⑹Electronic leak detector for leak detection. The main parts of the leak detection are: the welding of the suction and exhaust pipes of the compressor; the small elbows of the evaporator, condenser, inlet and outlet pipes and the welding parts of each branch pipe: such as the drying filter, the cut-off valve, the solenoid valve, Connections for thermal expansion valves, distributors, storage tanks, etc. Judgment of the difference between leakage and clogging: After leaking, leaking, vacuuming, and refilling the refrigerant, the air conditioner can restore the cooling effect; if it is clogged, even if fluoride is added, the air conditioner cannot be cooled and the pressure is abnormal.

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    Five methods for leak detection in refrigeration systems

    06/14/2020

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    What is a heat pump？

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    Tube heat exchanger

    06/14/2020

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