1. Generally, the level of discharge pressure and the size of the discharge volume should be considered. General-purpose air power compressor discharge pressure is 0.7mpa (the old standard is 0.8mpa). Currently on the market there is a discharge pressure of 0.5mpa air compressor, from the point of view of the use is unreasonable, because it is too small for the wind-powered tools for its pressure margin. For example, the starter motors used by some manufacturers nowadays cannot drive the loads they are intended to drive when the pressure is too low to be usable. In addition, from the design point of view, this compressor is designed for one-stage compression, the pressure is too large, which is easy to cause the exhaust temperature is too high, resulting in carbon build-up in the cylinder, which causes damage to the equipment and leads to accidents. Exhaust volume is one of the main parameters of the air compressor, the selection of air compressor gas volume and the required exhaust volume to match, generally have a margin of 10%, if the gas volume and the air compressor exhaust volume is small, the air motor is started, it will cause the compressor exhaust pressure is greatly reduced, and can not be driven. Of course, the blind pursuit of large exhaust volume is also wrong, because the larger the exhaust volume compressor with the larger the motor, not only high prices, but also in the use of energy consumption is also large.

2, in the selection of the main consideration of the quality of air produced by the air compressor. General air compressor generated by the air pressure gas contains a certain amount of moisture, and contains a certain amount of oil. In some of the higher degree of automation of the assembly line, in order to make its air quality to achieve the best, which should not only pay attention to the selection of air compressor type, and its supporting facilities (dryer) selection should also pay attention to. Generally the air compressor and then add a first- or second-class purifier device and dryer, this configuration can make the compressor air water and oil content control in the 5ppm or less to meet the needs of production.

3, to consider the compressor operation safety. Air compressor is a kind of air pressure work machine, the work is accompanied by temperature rise and pressure, its operational safety should be given priority, so when buying must look at the production of the manufacturer whether there is a licence to produce, to strictly review the relevant documents of the enterprise.

4, the traditional method of determining the compressed air requirements of a new plant is to add all the air volume together, and then consider adding a safety, leakage and development, such as an existing plant, you can simply test to know whether the air supply is sufficient, such as can not be increased by how much!

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