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What are the reasons for the high temperature shutdown of the air compressor and the coking of the oil?

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Author : Runningway
Update time : 2021-07-28 15:44:51
When many enterprise users deal with the high-temperature shutdown of the screw air compressor, most of them just clean the cooler and change the oil. This method has a very obvious effect on the new machine. But for the old machine more than two years old, it is a temporary solution rather than a permanent cure.

The specific follow-up is often shortly after cleaning, and the phenomenon of high temperature shutdown occurs again. In this case, we always suspect that the cooler has not been cleaned thoroughly.

In fact, it is not the case. The incomplete cleaning of the cooler is only one of the reasons, but it is actually a huge hidden danger of high temperature in the oil system of the machine. Most of the current screw air compressors use mineral oil or semi-synthetic oil based on mineral oil, and the service life is generally between 2000-4000 hours. This kind of oil usually has coking after two years of operation.

   This phenomenon occurs even with a normal oil change, because it is impossible to discharge 100% of the sunken oil every time the oil is changed. The remaining sunken oil is deposited at the low point of the oil circuit such as the screw main engine, and then participates in the oil circuit circulation together with the new oil. . Running for a certain period of time will cause the oil to deteriorate and cause coking. Green or blue discharge liquid will be discharged from the sewage outlet of the screw air compressor. When the oil is changed, the oil will have a very high viscosity and bituminous hard blocks will be discharged. If the machine continues to run, it will be difficult to start the machine cold, and when the overload is severe, the host may even fail to rotate, resulting in a false lock.

In the past, if you want to deal with this situation thoroughly, you usually disassemble and clean the host. Soaking in a special cleaning agent, and then cleaning and soaking the oil separator tank, cooler and main oil circuit components, the process is complicated, time-consuming and laborious. And all the seals of the machine must be replaced after soaking. The cost of such a cleaning is very expensive, and many air compressor users cannot afford it.

But now with the development of the air compressor industry, dealing with this situation no longer has to be so cumbersome. The new method of operation is to use a special test agent for oil coking to test the oil sample; if it is determined that the oil is coking, just add one-tenth of the amount of cleaning agent to the lubricating oil and run it for 40-60 hours. Drain the lubricating oil. The inside of the machine will be thoroughly cleaned. Then add new oil to operate normally. Save time, effort and low cost. In addition, the sweeping cleaning agent does not produce a chemical reaction with the oil, but the coking is diluted and then cleaned and discharged, so it will not cause any corrosion to the metal and non-metal parts of the machine.
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