Seven detection methods for automobile air-conditioning refrigerant leakage_maintenance

　　【】Refrigerant leakage is a common fault in the use of air conditioners. Some refrigerants need to be added once a year, and some may be added once every two months. Refrigerant leakage is likely to cause environmental pollution, and in addition, it increases the cost and time for vehicle owners to maintain their vehicles. The following are seven methods of leak detection for car air conditioners.

　　Visual inspection of leak detection

　　 When oil stains are found somewhere in the system, this may be a leak point. Visual leak detection is simple and easy, without cost, but it has major drawbacks. Unless the system suddenly breaks with a large leak and the system leaks liquid and colored media, the visual leak detection cannot be located because the leak is usually very small. And the car air conditioner itself has many parts that are almost invisible.

　　 soapy water leak detection

　　 fill the system with 10-20kg/cm2 pressure nitrogen, and then apply soapy water to each part of the system. The bubbling point is the leakage point. This method is currently a common leak detection method in roadside repair shops z*, but people’s arms are limited, and people’s eyesight is limited, and in many cases no leaks can be seen at all.

　　Nitrogen water leak detection

　　 Fill the system with 10-20kg/cm2 pressure nitrogen, immerse the system in water, the bubbling point is the leakage point. This method is essentially the same as the previous soapy water leak detection method. Although the cost is low, it has obvious shortcomings:

　　 The water used for leak detection easily enters the system, causing the materials in the system to be corroded and high pressure Gas may also cause greater damage to the system, and the labor intensity during leak detection is also high, which increases the cost of maintenance and repair.

　　halogen lamp leak detection

　　 ignite the leak detection lamp, hold the air tube on the halogen lamp, when the tube mouth is close to the system leakage, the flame color changes to purple blue, that is Indicates that there is a large number of leaks here. In this way, open flames are generated, which is not only dangerous, but the combination of open flames and refrigerants will produce harmful gases, and it is also difficult to accurately locate leaks. So almost no one uses this method now. If you can see it, it may be in the stage of non-civilized society.

　　Gas differential pressure leak detection

　　Using the pressure difference inside and outside the system, the pressure difference is amplified by the sensor, and the leak detection result is expressed in digital, sound or electronic signals. This method can only qualitatively know whether the system is leaking and cannot accurately find the leak point.

　　Electronic leak detection

　　 Use the probe to move to the place where there is a possibility of leakage. When the leak detection device issues an alarm, it means that there is a large amount of leakage. Electronic leak detection products are easily damaged, complicated to maintain, easily affected by environmental chemicals such as gasoline and exhaust gas, and cannot accurately locate leaks.

　　Fluorescence leak detection

　　 It uses the principle that fluorescent leak detection agent emits bright yellow and green light under the irradiation of ultraviolet/blue leak detection lamp to leak fluids in various systems. For testing. When in use, you only need to add fluorescent agent in a certain proportion to the system. After the system runs for 20 minutes, put on special glasses and illuminate the outside of the system with a leak detection lamp. The leak will show yellow fluorescence.

The advantage of 　　 fluorescent leak detection is that it is accurately positioned, the leakage point can be seen directly with the eyes, and it is simple to use, easy to carry, and low in maintenance cost, which represents the development direction of automobile leak detection. It is understood that TP fluorescent leak detection technology has a history of more than 50 years abroad, and has been recognized and applied by major automakers in the world including General Motors, Volkswagen, and Mitsubishi.

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