The basic criteria for choosing a compressor are economy, reliability and safety.
One is to consider the level of exhaust pressure and the size of the exhaust. General purpose aerodynamic compressor discharge pressure is 0.7MPa, the old standard is 0. 8MPa. At present, there is a type of air compressor with an exhaust pressure of 0.5 MPa, which is irrational from the standpoint of use because the pressure margin is too small for pneumatic tools, and gas transmission distances that are a little longer cannot be used. In addition, from the design point of view, this kind of compressor is designed for one-stage compression, and the pressure ratio is too large, which can easily cause the exhaust gas temperature to be too high, resulting in carbon deposition on the cylinder, leading to accidents. If the compressor used by the user is more than 0.8 MPa, it must be specially manufactured. The method of forced pressurization cannot be adopted to avoid accidents.
The displacement is one of the main parameters of the air compressor. The air volume of the selected air compressor must be matched with the required air volume, and a 10% margin is left. If the air volume is large and the air compressor discharge volume is small, when the pneumatic tool is started, the air compressor discharge pressure will be greatly reduced, and the air moving tool cannot be driven. Of course, blindly pursuing large displacements is also wrong, because the larger the displacement, the larger the motor that the compressor is equipped with, which is not only high in price, but also a waste of acquisition funds, and it also wastes electricity and energy when used.
In addition, the peak usage, normal usage and trough consumption should also be considered when selecting the exhaust gas volume. If the amount of trough is large, and the amount of usage and peak usage are not large, the common method in foreign countries is to use a smaller amount of air compressor in parallel to obtain a larger amount of exhaust gas, and then turn on the power one by one as the air volume increases. Not only is it good for the power grid, but it also saves energy.
The second is to consider the use of gas conditions and conditions. Such as the use of gas space is small (marine, vehicle), should choose the vertical; if the use of gas changes in long-distance (more than 500 meters), you should consider the mobile; if you can not supply power, you should choose diesel-driven If there is no tap water on the occasion, you must choose the air-cooled type.
In air-cooled and water-cooled cooling systems, users often have the wrong understanding that water cooling is good, but it is not. The air-cooled type of small compressors at home and abroad accounts for more than 90%. This is because the air-cooled design is simple and it does not require water when used.
The fatal disadvantages of water-cooled compressors are fourfold: they must have a complete water system, and they have a large investment; the water-cooled coolers have a short life; in the north, they can easily freeze cylinders; in normal operation, a lot of water is wasted.
The third is to consider the quality of compressed air. Compressed air produced by general air compressors contains a certain amount of lubricating oil and a certain amount of water. In some cases, oil is banned and water is banned. In this case, attention must be paid not only to the selection of the compressor, but also to the attachment if necessary.
The solution: First, use a non-lubricated compressor. This type of compressor cylinder is substantially free of oil and its piston rings and packing are typically PTFE. However, this kind of machine also has drawbacks, poor lubrication, high failure rate; PTFE is also a harmful substance, food and pharmaceutical industry can not be used; non-lubricated compressors can only do gas without oil, can not do without water. The second and most common method is to add a primary or secondary purifier or dryer to the air compressor (regardless of the type). This device can make the compressor air neither oil nor water, so that the amount of oil and water in the compressed air is less than 5ppm, to meet the process requirements.
The fourth is to consider the safety of compressor operation. The air compressor is a kind of pressure-bearing machine. It is accompanied by temperature rise and pressure during work. The safety of its operation must be given priority. The state implements a standardized "two certificates" system for the production of compressors, namely the compressor production license and the pressure vessel production license (gas storage tank). Therefore, in the selection of compressor products, the "two certificates" must be strictly examined. Usually, the manufacturer's product quality assurance system is perfect and there will be no major quality problems. Even if some problems occur, the manufacturer will also be responsible for the three packages.
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