2026-05-25Views：
air compressors can be divided into three categories according to whether there is oil in the compression process and what to use for lubrication: micro-oil air compressors, dry oil-free air compressors, and water-lubricated oil-free air compressors. The following uses the most popular words to explain the difference between them clearly.
when the micro-oil air
compressor compresses air, it will spray a small amount of lubricating oil into the machine. The oil does three things in it: reducing friction between the screws, blocking the gaps to prevent air from running away, and taking away the heat generated by compression. But the problem is that the oil will run out with the air, so a set of filtering equipment must be added to the back to separate the oil from the air.
The dry oil-free air
compressor does not add anything to the compression chamber, relying entirely on the smallest gap between the screws and special materials to reduce friction. The air goes in and out, without touching any oil, and comes out clean.
The compression chamber of the water-lubricated oil-free air
compressor is not oil, but treated water. Water in the same dry three things: lubrication screw, seal the gap, take away heat. After compression, the gas and water are separated by a separation device, and the water is recycled. There is no oil in the air.
To make a simple analogy: slight oil is like putting oil in a pan when cooking, and the dish will smell oily. Dry oil-free is like using a non-stick pan, and the pan itself does not need oil. Water lubrication is like stir-frying with water. Water is added to the pan, and the dishes naturally have no oily taste.
no matter how well the micro-oil air
compressor filters, there will be a little oil left in the air. Although the amount is very small, for some special industries, this oil may cause product scrap.
The air from the dry oil-free air
compressor is almost oil-free, very clean, and suitable for occasions with extremely high air quality requirements.
The air from the water-lubricated oil-free air
compressor also does not contain oil, and because the water itself has a good cooling capacity, the temperature control during the compression process is better, and the air quality is also very stable.
the micro-oil air
compressor needs to change the lubricating oil, oil filter element and oil and gas separation core regularly. These are all consumables and have to be bought at intervals. There are many maintenance projects, and consumables cost a lot in the long run.
The dry oil-free air
compressor does not need to change the oil or the oil filter element, but only needs to change the air filter element regularly. Maintenance is simple and costs less.
Water-lubricated oil-free air
compressors do not use lubricating oil, and there are no consumables such as oil filter elements. Water is used, which can be recycled and only needs to be replenished and treated regularly. The overall maintenance cost is much lower than that of micro-oil, and there is one more benefit of water cooling than dry oil-free, that is, the internal temperature of the machine is easier to control and the parts wear less.
the micro-oil air
compressor has mature technology, low manufacturing cost, and the cheapest price when bought. It is the first choice for most general scenarios.
Dry oil-free air
compressor is much more expensive than micro-oil when it is bought because of its high requirements for materials and processing accuracy.
The purchase price of water lubricated oil-free air
compressor is also higher than that of micro-oil, but it has its own advantages over dry oil-free air compressor. Because its core components are protected by water film, the friction during operation is smaller, the host is more durable in the long run, and the number and cost of overhaul are less than dry and oil-free.
the micro-oil air
compressor is suitable for general scenes that do not require high air cleanliness. For example, pneumatic tools, ordinary mechanical processing, pneumatic picks and hammers on construction sites, a little oil does not affect the use at all, with the highest cost performance.
Dry oil-free air
compressor is suitable for food, medicine, electronics, precision instruments, these absolutely can not have oil industry. The air coming out is clean enough to come into direct contact with the product.
Water lubricated oil-free air
compressor is also suitable for food, medicine, electronics, spraying and other high clean needs of the industry. It also has an advantage that dry-type oil-free cannot compare: the cooling capacity of water is stronger than that of oil, the compression process is closer to the ideal state, and the power saving effect is more obvious. At the same time, because of the water film lubrication, the wear between the screw and the star wheel is small, the machine runs more smoothly, and the noise is lower. In some temperature-sensitive, noise-sensitive, and air-absolutely oil-free occasions, water lubrication is a very balanced choice.
micro-oil is cheap and easy to use, but the air tastes a little oily. Dry oil-free air is the cleanest but the machine is expensive and well-maintained. Water lubrication oil-free water uses water instead of oil to work. The air is also clean and energy-saving and durable. It is a way of thinking that takes into account both quality and cost. Which to choose depends on whether your product is afraid of oil, how much your budget is, and whether you are willing to spend time on later maintenance.
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