Why is a fan installed in the compressor oil tank?

In the systems designed these days, there are issues related to the fuel tank: some designs use normal pressure while others employ slight negative pressure. The purpose of a fan is to introduce nitrogen into the fuel tank for protection, and it helps to remove oil fumes and mist promptly. Maintaining a slight negative pressure in the fuel tank ensures smooth circulation. However, there are also designs that do not include fans at all; they operate at normal pressure, relying on the height difference between the first and second floors to allow oil to return to the tank. It depends on how the system is designed. Anyway, I personally think it’s better to have a fan

I think the air compressor that the original poster took apart is a Cooper one, right? It uses instrument air for vacuum extraction; I think this method is energy-efficient and has a low failure rate. Manufacturers that adopt such a design philosophy are those that consider the needs of their customers – but how many exist these days? Oil mist fans are so simple to use – just plug them in, and that’s it. In my opinion, using oil mist fans represents the worst possible approach.

I have a question regarding the funds for official expenses. What does \"vacuum pumping of instrument gas on the third floor\" mean?

The last edit to this post was made by Advantages are dumb on 2011-9-21 at 22:09. The purpose of installing a fan (an oil mist exhaust fan) is to maintain a negative pressure inside the fuel tank and to remove oil fumes promptly. The main goal of maintaining a slight negative pressure in the fuel tank is to ensure smooth circulation, which in turn helps to reduce the likelihood of oil leakage from the seals in various parts. In fact, the precision requirements for such oil seals are not that high. If no fan is used, then the oil seal must be adjusted to the perfect level.

Reply to 1#: The functions of the demister and fans (vacuum pumps) are: a) to create a negative pressure (around -10 mbar) in the compressor gearbox and oil tank; a) to ensure smooth oil return in the compressor, motor, and steam turbine； a Eliminate oil leakage at the compressor shaft seal and the motor oil seal ； A filter recovers most of the oil from the cooking fumes back into the fuel tank. There are several ways to create negative pressure: a motor-driven exhaust fan or vacuum pump, or an air-driven ejector ； a jet driven by steam.

Whether it is using a vacuum pump or an exhaust fan, the goal is to create negative pressure. Among the points listed for the 6th floor, one of them is “to eliminate oil leaks at the compressor shaft seals and the motor oil seals”; this is the most important aspect. Please note that it refers to oil leaks at the shaft seals and oil seals (not just those of the motor). In many compressors, the distance between the shaft seal and the oil seal is very small. When there is a significant amount of gas leakage from the shaft seal, as that gas escapes outward, it creates a negative pressure in the gap surrounding the oil seal. This negative pressure draws the oil inside the oil seal out, resulting in a large amount of oil mist being released. This is why, during equipment maintenance, the gap around the oil seal may be quite small and within acceptable limits, yet the equipment still leaks oil heavily. The underlying principle can be understood using Bernoulli’s equation; it’s actually the same principle as that used in vacuum pumps. In short, in many cases, oil leakage from the oil seal is not caused by the oil seal itself, but rather by severe gas leakage from the nearby shaft seal (gas seal). I have dealt with air compressor oil leakage issues on many occasions, and in most cases it was due to the gas seal. Therefore, it is necessary to maintain a certain level of vacuum in the fuel tank and fuel lines in order to counteract the negative pressure caused by air leakage from the gas seal.

After reading what the experts above have said, I have a deeper understanding of this exhaust fan used in gas stations; it turns out it has so many uses in this area

It seems I really didn’t think about this issue in detail before; I simply assumed that exhaust fans were used to remove fumes from inside the fuel tank. It turns out there are so many aspects to it – I’ve learned something new. I’ll be more careful when looking at issues from now on

Reply to 10# liuiiiii: Knowledge is gained through little by little experiences; small issues reveal great wisdom, right?