What should be paid attention to when using a screw permanent magnet air compressor in daily life? This is a question many users have. Today, the editor will give you a brief introduction.
First, the exhaust pressure and exhaust volume should be considered. The exhaust pressure of a general-purpose air compressor is 0.8MPa. At present, there is an air compressor with an exhaust pressure of 0.6MPa in the society, which is unreasonable from the perspective of use, because its pressure margin is too small for pneumatic tools, and it cannot be used if the air transmission distance is a little longer. In addition, from the design point of view, this compressor is designed for one-stage compression, and the pressure ratio is too large, which is easy to cause the exhaust temperature to be too high, causing carbon deposition in the cylinder, leading to accidents. If the compressor used by the user is greater than 1.0MPa, it is generally specially manufactured, and forced pressurization cannot be adopted to avoid accidents. Exhaust volume is one of the main parameters of the air compressor. The air volume of the selected air compressor should match the required exhaust volume, and leave a 10% margin. If the air volume is large and the air compressor exhaust volume is small, once the pneumatic tool is started, the exhaust pressure of the air compressor will be greatly reduced, and the pneumatic tool cannot be driven. Of course, it is wrong to blindly pursue large displacement, because the larger the displacement, the larger the motor of the compressor, which is not only expensive, but also wastes purchase funds and wastes electricity when used. In addition, when selecting the displacement, peak usage, normal usage and valley usage should also be considered. If the valley usage is large, but the normal usage and peak usage are not large, the common method abroad is to connect screw air compressors with smaller displacement in parallel to obtain a larger displacement, and start them one by one as the gas usage increases. This is not only good for the power grid, but also saves energy.
Second, consider the gas usage occasions and conditions. If the gas usage site is small (for ships and cars), vertical type should be selected; if the gas usage site has long-distance changes (more than 500 meters), mobile type should be considered; if the usage site cannot be powered, diesel engine driven type should be selected; if there is no running water in the usage site, air cooling should be selected. In terms of air cooling and water cooling, users often have a wrong understanding that water cooling is good, but it is not. Air-cooled compressors account for more than 90% of small compressors at home and abroad. This is because air cooling is simple in design and does not require a water source when used. The fatal disadvantages of water-cooled compressors are four: a complete water system is required, which requires a large investment; the life of water-cooled coolers is short; the cylinder is easily frozen in the winter in the north; and a large amount of water is wasted in normal operation.
Third, the quality of compressed air should be considered. The compressed air produced by general air compressors contains a certain amount of lubricating oil and a certain amount of water. In some occasions, oil and water are prohibited. At this time, not only should attention be paid to the selection of compressors, but also auxiliary devices should be added when necessary. The solution: First, use a non-lubricated compressor. This type of compressor cylinder basically does not contain oil, and its piston rings and packing are generally polytetrafluoroethylene. However, this machine also has disadvantages, such as poor lubrication and high failure rate; polytetrafluoroethylene is also a harmful substance and cannot be used in the food and pharmaceutical industries; non-lubricated compressors can only ensure that the gas is oil-free, but not water-free. Another common method is to add a first-level or second-level purification device or dryer to the air compressor (regardless of the type). This device can make the compressor air neither oil-free nor water-free, and make the oil and water content in the compressed air below 5ppm, which can meet the process requirements.
Fourth, the reliability of the compressor operation should be considered. The air compressor is a machine that works under pressure. When working, it is accompanied by temperature rise and pressure. The reliability of its operation should be put first. The country implements a standardized "two-certificate" system for the production of compressors, namely the compressor production license and the pressure vessel production license (gas tank). Therefore, when purchasing compressor products, the "two certificates" should be strictly examined. Usually, the product quality assurance system of certified manufacturers is perfect, and there will be no major quality problems. Even if some problems occur, the manufacturer will be responsible for the three guarantees.