How to find ammonia leakage in air conditioners, and how to check ammonia leaks in automobile air co

Use dish soap and a towel to rub a lot of bubbles, and then apply the bubbles to suspicious places, if they leak, they will blow out a lot of bubbles, obviously.

Leak detection is the primary work of leak maintenance, and the commonly used leak detection methods include fluorescent leak detection, soapy water leak detection, halogen lamp leak detection, electronic leak detection, etc.

1. Fluorescent leak detection is the use of fluorescent leak detection agent in ultraviolet blue light and other irradiation will emit bright yellow-green light to detect fluid leakage in various systems, but the compatibility between the PAG lubricating oil used in the early application of R134A and R134A is poor, and the fluorescent leak detector has lost its usefulness due to the difficulty of finding oil traces at the leakage.

2. Soapy water leak detection is to fill the system with nitrogen at the pressure level, and then apply soapy water to all parts of the system, and the bubbling place is the leakage point, this method is the most commonly used leak detection method in roadside repair shops a few days ago, but the human arm is limited, and the range of vision is also limited, and many times the leakage point cannot be seen at all.

3. Halogen lamp leak detection is to ignite the leak detection lamp, the air pipe on the halogen lamp is close to the refrigeration system pipeline, when the pipeline has leakage, the flame color will change to purple blue, using this method to detect leaks with open flames, not only dangerous, but also the combination of open flame and refrigerant will produce harmful gases, in addition, it is not easy to accurately locate the leakage point.

4. Electronic leak detection, that is, the probe of the leak detection device moves towards the part that may leak, if the leak detection device sends out an alarm, it indicates that there is a leak here. Electronic leak detection instruments are easily damaged, complex to maintain, and easily affected by environmental chemicals such as gasoline and exhaust gases, and cannot accurately locate leaks.

5, segmented pressure holding detection, that is, the production of special joint fixtures, and then the device, the pipeline respectively pressure testing, this is a more reliable leak detection method, in the case of multiple devices, multiple pipelines, according to the cause of leakage of the components and combined with the vehicle condition, in accordance with the principle of the first focus and then the general principle of orderly detection, the efficiency of the maintenance work is greatly improved.

Visual leak detection.

When an oil stain is found somewhere in the system, it may be a leak point. Visual leak detection is simple and easy and has no cost, but it has a big drawback, unless the system suddenly breaks a large leak point, and the system leaks a liquid colored medium, then the visual leak detection cannot be located, because usually the leak is very subtle, and there are many parts of the car air conditioner itself that are almost invisible.

Soapy water leak detection.

Fill the system with 10-20kg cm2 pressure nitrogen, and then apply soapy water to all parts of the system, and the bubbling place is the leakage point. This method is the most common leak detection method in roadside repair shops, but the human arm is limited, the range of human vision is limited, and many times the leakage point cannot be seen at all.

Nitrogen water leak detection.

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

Moisture for leak detection can easily enter the system, resulting in corrosion of the materials in the system, and at the same time, high-pressure gas may also cause greater damage to the system, and the labor intensity of leak detection is also very high, which increases the cost of maintenance and repair.

Halogen lamp leak detection.

Light the leak detection lamp, hold the air pipe on the halogen lamp, and when the nozzle* is close to the leak in the system, the flame color changes to violet-blue, indicating that there is a large leak here. This method produces an open flame, which is not only dangerous, but also produces harmful gases when the open flame and refrigerant are combined, and it is not easy to accurately locate the leak. So it's almost not used now, and if you can see it, it's probably in the stage of an uncivilized society.

Gas differential pressure leak detection.

Using the air pressure difference inside and outside the system, the pressure difference is amplified by the sensor, and the leak detection result is expressed in the form of a digital or audible or electronic signal. This method can only "qualitatively" know whether the system is leaking but cannot accurately find the leakage.

Electronic leak detection. Use the probe to move the probe over the potential leak, and when the leak detector sounds an alarm, it indicates that there is a large leak in the area. Electronic leak detection products are easily damaged, complex to maintain, and easily affected by environmental chemicals such as gasoline and exhaust gases, and cannot accurately locate leaks.

Fluorescent leak detection. It uses the principle that fluorescent leak detector will emit bright yellow-green light under the irradiation of ultraviolet blue light leak detection lamp to detect fluid leakage in various systems. When using, only need to add a certain proportion of fluorescent agent to the system, after 20 minutes of operation of the system, wear special glasses, and irradiate the outside of the system with a leak detection lamp, and the leakage will fluoresce yellow.

The advantages of fluorescent leak detection are accurate positioning, the leakage point can be seen directly with the eyes, and it is simple to use, easy to carry, and low maintenance cost, which represents the development direction of automobile leak detection. It is understood that TP fluorescence leak detection technology has a history of more than 50 years in foreign countries, and has been recognized and applied by the world's major automobile manufacturers, including General Motors, Volkswagen and Mitsubishi.

The easiest way is to open the air conditioner after pressurization, use a watering can with dish soap to spray all the joints of the air conditioning lines and compressor that you can see, and the air leakage can be seen.