7 kinds of simple detection methods for refrigerant leakage of refrigerating truck refrigeration unit

Refrigerant leakage is the most common failure in air conditioning use. Some refrigerants need to be added once a year, and some may be added once every two months. Refrigerant leakage can easily cause environmental pollution, and increase the cost and time for the owner to maintain the vehicle. The following are seven methods for leak detection in automotive air conditioners. Visual inspection

When it is found that there is oil on the system, it may be a leak point here. Visual inspection of leaks is simple and easy, no cost, but there are big defects, unless the system suddenly breaks the big leak, and the system leaks liquid colored medium, otherwise the visual leak detection can not be located, because the leakage is usually very small, And the car air conditioner itself has almost no parts to see. Soap water leak detection

Fill the system with 10-20kgcm2 of pressurized nitrogen, and then apply soapy water to all parts of the system. The bubble is the leak point. This method is currently the most common method of leak detection in roadside repair shops, but the human arm is limited, the range of human vision is limited, and many times there is no visible leak. Nitrogen water leak detection

Charge the system with 10-20 kgcm2 of pressurized nitrogen, immerse the system in water, and the bubble point is the leak point. This method is essentially the same as the previous soap water leak detection method. Although the cost is low, there are obvious disadvantages: moisture for leak detection easily enters the system, causing corrosion of materials in the system, and high pressure gas may also cause more damage to the system. For large damages, the labor intensity is also high when leak detection is performed, which increases the cost of maintenance and repair. Halogen lamp leak detection

Ignite the leak detector and hold the air tube on the halogen lamp. When the nozzle is close to the system leak, the flame color turns purple-blue, indicating a large amount of leakage. This method has an open flame, which is not only dangerous, but also the combination of open flame and refrigerant generates harmful gases, and it is not easy to accurately locate the leak. So this method is now almost no one is used. If you can see it, it may be in the stage of uncivilized society. Gas differential pressure leak detection

Using the air pressure difference inside and outside the system, the differential pressure is amplified by the sensor to express the leak detection result by digital or acoustic or electronic signals. This method can also only "qualitatively" know if the system leaks and cannot find the leak accurately.