How to detect the leakage of refrigerant in refrigerated transportation_maintenance

　　 Refrigeration Network: Leakage of refrigerant in refrigerated transportation can easily cause environmental pollution, and it also increases the cost and time for owners of refrigerated transportation to maintain their vehicles. The following are several methods of leak detection.

　　 Visual 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 10-20kgcm2 pressure nitrogen, and then apply soapy water to all parts 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 10-20kgcm2 pressure nitrogen, immerse the system in water, and 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 is easy to enter the system, causing the materials in the system to be corroded, and the high-pressure gas may also cause damage to the system. Large damages and labor intensity during leak detection are 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 nozzle is close to the system leakage, the flame color changes to purple blue, which means that there is a large amount of leakage. . 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: The pressure difference between the inside and outside of the system is used to amplify the pressure difference through the sensor, and the leak detection result is expressed in the form of digital or sound or electronic signals. This method can only qualitatively know whether the system is leaking and cannot accurately find the leak point.

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