Linsheng – Air Compressor: The Difference Between Oil And Oil

linsheng    explains the advantages of oil-free air compressors and their differences with oil-air compressors

There is an oil-free air compressor in the air compressor that is very popular among the teaching and research departments of scientific research institutions. Oil-free air compressors have many unique features and benefits. In fact, the oil-free air compressors are generally not contained in a single oil. The oil-free air compressors are completely oil-free, and the air pressure is lubricated with resin materials. The machine is a true all-oil-free air compressor, and the general oil-free air compressor has only a very small amount of oil.

So now    linsheng   focuses on the two, to see the advantages of oil-free air compressors and their differences with oil air compressors.

Specifically look at their differences: the oil and oil in the air compressor generally refers to the amount of oil in the exhaust gas of the air compressor exhaust, generally the oil content of the oil machine is large, the oil content of the oil-free machine It is 0.01ppm, so use this oil content to distinguish between air compressors with oil and no oil. There is also a completely oil-free air compressor, which is not lubricated with oil, but is lubricated with a resin material, so the final gas discharged without oil is called a full oil-free air compressor.

There is also a completely oil-free air compressor, which is not lubricated with oil, but is lubricated with a resin material, so the final gas discharged without oil is called a full oil-free air compressor, but the quality of such air compressor is currently Not very satisfactory, the domestic general is oil-free oil-free machine. Air in the air compressor air tank occupies a certain amount of space, but it does not have a fixed shape and volume. When pressure is applied to the air in the closed container, the volume of the air is compressed to increase the internal pressure. When the external force is removed, the air will return to its original volume under the action of internal pressure.

In the past, such air compressors were damaged due to the loss of sealed grease, resulting in dry grinding of the bearings. The quality is not very satisfactory. The oil-lubricated oil-free machine is generally used in China. Now the latest oil-free air pressure is developed. The oil-free air compressor is improved on the basis of the machine. The oil-free air compressor uses the insulated piston and the insulated connecting rod, so that the bearing grease is no longer lost by the high-temperature conduction and radiation, so that the oil-free air is completely eliminated. The life of the press is greatly extended, and it has completely exceeded the life of the oil machine of the same grade. Generally, there is a large oil content in the oil machine, and the oil content of the oil-free machine is 0.01 ppm, so this oil content is used to distinguish the air compressor from oil and oil.

It is necessary to use a multi-stage separation filter device in the compressed air system or to pre-process compressed air into a certain relative humidity for dry air; oil–high-speed, high-temperature operation air compressor can be lubricated with lubricating oil. , sealing and cooling, but polluting compressed air. The oil-less, semi-oilless and all-oilless machines developed with self-lubricating materials reduce the oil content in the compressed air, but also reduce the life of the consumable parts, and the internal and piping systems are corroded and empty. Side effects such as increased oil content during the running-in period, wear period and de-loading period of the press. This is undoubtedly a threat to automated production lines that pursue high reliability.

There is an object that can move in the container. When the air returns to its original volume, the object will be pushed outward by the pressure of the air inside the container. This principle is widely used in production and life. Moisture – the relative humidity in the atmosphere is generally more than 65%. After compression and condensation, it becomes wet saturated air and entrains a large amount of liquid water droplets. They are the root cause of corrosion of equipment, pipes and valves. A small hole passage in a pneumatic system. It is worth noting that even if it is separated from pure pure saturated air, as the temperature decreases, there will still be condensed water, and the saturated water content will decrease by 50% for every 10 °C reduction, that is, half of the water vapor. Converted into liquid water droplets.

Let’s take a look at the advantages of oil-free air compressors.

1. At present, the refrigerating dryer, the non-heat regenerative dryer, the micro-heat regenerative dryer and other water-removing equipment lose the water-removing function due to the oil in the compressed air; and the clean oil-free gas after being compressed by the all-oilless compressor It fully protects the water removal equipment and reduces the additional capital occupied by the maintenance of the water removal equipment.

Second, the use of oil air compressor greatly wastes the lubricating oil, taking a 7.5KW high-quality oil air compressor as an example, the minimum consumption of 5 kg of lubricating oil per month, will pay 60 kg of lubricating oil use cost in one year. At the same time, in order to remove the oil in the compressed gas, it is necessary to use a high-efficiency oil filter, and it is a great expense to replace the filter core multiple times.

Third, because of the high viscosity of the lubricating oil, the current degreasing equipment can not be completely removed, so that the oil-free gas after compression of the oil-free air compressor is irreplaceable.

Fourth, the use of all oil-free air compressor to provide external compression gas, will not greatly reduce the motor load due to pressure loss caused by degreasing equipment, to achieve energy-saving effect; the current good quality three-stage degreaser will be produced during use 1 to 1.2 kg of pressure loss, a 7.5KW air compressor will pay 600W of power loss for every 1 kg of pressure increase, and 6 degrees of electricity will be paid every working day (10 hours for example). Long-term intangible expenses.

Of course, oil-free air compressors are mostly piston machines. Although oil-free screw air compressors are also used, they are mostly used in large-scale scenes. In daily life, they are not very common. They are not introduced here.

In fact, each type of air compressor has its own advantages and has its own shortcomings. When choosing, it should make suitable choices according to their respective needs. There is no absolute regulation. Only recognize the advantages of each air compressor. The shortcomings can be made, and a full understanding can be beneficial to the choice.

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