Oil-free screw air compressors are widely used in chemical, petroleum, transportation, construction, navigation, mining and other fields. The output accounts for more than 90% of the total output of oil-free screw air compressors. Oil-free screw air compressors have a wide variety of types, ranging from air pumps for automobiles and tractors to large oil-free screw air compressors for mountain excavation and mining.
Oil-free screw air compressor refers to the equipment in which the compressed air path and the oil path are not together, and there is no oil and water when the gas is produced. Due to its special transmission method, the cost will be relatively high, but the oil-free screw air compressor is a water-only air compressor, and subsequent maintenance does not need to add lubricating oil. In the long run, it can save a lot of costs in the later period. . How to choose a good air compressor for yourself?
The basic criteria for choosing oil-free screw air compressors are economy, reliability and safety.
1. The level of exhaust pressure and the amount of exhaust should be considered.
When calculating the minimum exhaust pressure requirement, we need to take into account the different pressure levels and pressure drops of the compressed air equipment. Compressed air enters from one component to another, and the pressure in the equipment is also reduced. Some people often make the wrong judgment that the air compressor pressure is too low or unstable, and that it is caused by insufficient exhaust pressure.
The air displacement is one of the main parameters of an oil-free screw air compressor. The air volume of an oil-free screw air compressor should be matched with the required air displacement, and a 10% margin should be left. If the air consumption is large but the displacement of the oil-free screw air compressor is small, when the pneumatic tool is started, the exhaust pressure of the oil-free screw air compressor will be greatly reduced, and the pneumatic tool cannot be driven. Of course, blindly pursuing a large displacement is also wrong, because the larger the displacement, the larger the motor equipped with the oil-free screw air compressor, not only the higher the price, but also a waste of purchase funds, as well as a waste of electricity when used.
In addition, when selecting the exhaust gas volume, the peak volume, the usual volume and the low volume volume should also be considered. If the trough consumption is large, but the usual and peak consumptions are not large, the usual method abroad is to use oil-free screw air compressors with smaller displacements in parallel to obtain a larger displacement, which will increase one by one as the gas consumption increases. Turn on the device, which is not only good for the grid, but also saves energy.
2. The occasions and conditions for gas use must be considered.
If the gas space is narrow (for boats, vehicles), the vertical type should be selected; if there is a long-distance change (over 500 meters) in the gas application, the mobile type should be considered; if the power supply is not available, the diesel-driven type should be selected ; If there is no tap water in the application, the air-cooled type must be selected.
Regarding the two cooling methods of air cooling and water cooling, users often have the wrong understanding that water cooling is good, but it is not. The air-cooled type accounts for more than 90% of the small oil-free screw air compressors at home and abroad. This is because the air-cooling is simple in design and no water source is required for use.
There are four fatal disadvantages of water-cooled oil-free screw air compressors:
There must be a complete water supply and discharge system, which requires a large investment;
The water-cooled cooler has a short life;
In the northern winter, it is easy to freeze the cylinder;
A lot of water will be wasted during normal operation.
3. The quality of compressed air must be considered.
Generally, the compressed air produced by oil-free screw air compressors contains a certain amount of lubricating oil and a certain amount of water. In some cases, oil and water are prohibited. At this time, not only should pay attention to the selection of oil-free screw air compressors, it is necessary When adding additional devices.
The solution: One is to use a non-lubricated and oil-free screw air compressor. This kind of oil-free screw air compressor basically does not contain oil in the cylinder, and its piston ring and packing are generally polytetrafluoroethylene. But this kind of machine also has shortcomings, poor lubrication, and high failure rate; PTFE is also a harmful substance, which cannot be used in the food and pharmaceutical industries; non-lubricated and oil-free screw air compressors can only deliver gas without oil, and cannot be used. To no water.
The second and commonly used method is to add an oil-free screw air compressor (no matter which type) to a primary or secondary purification device or dryer. This device can make the air of the oil-free screw air compressor contain neither oil nor water, so that the oily water content in the compressed air is below 5ppm, which can meet the process requirements.
4. The safety of the operation of oil-free screw air compressors must be considered.
5. The oil-free screw air compressor is a kind of machine that works under pressure. It is accompanied by temperature rise and pressure during work. The safety of its operation must be put in the first place.
When selecting an oil-free screw air compressor, the compressed air equipment suitable for production should be selected according to the user's specific situation and actual process requirements. Don't blindly choose high-quality and high-priced models for money greed and spend unnecessary expenses, and don't blindly select inferior models with frequent failures in order to save expenses, and be more cautious when selecting important power equipment in industrial production. For oil-free screw air compressors, the equipment prices of Dream Compressor are reasonable, and the small investment and high return will allow you to get more benefits.
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