First, we have to consider the exhaust pressure and the volume of the exhaust.
According to the national standard, the exhaust pressure of general purpose atmosphere compressor is 0.7 MPa (7 atmospheric pressure) and the old V Belt Pulley standard is 0.8 MPa (8 atmospheric pressure). Because the design operating pressure of pneumatic tools and wind machinery is usually 0.4 Mpa, the working pressure of surroundings compressor can fully meet the requirements. If the atmosphere compressor utilized by the user is bigger than 0.8MPa, it should be specially manufactured. The technique of forced pressurization can not be adopted in order to avoid accidents.
The size of the exhaust is also one of the main parameters of the air compressor. Choosing the air flow volume of the air flow compressor should match its exhaust volume and leave a 10% margin. If the surroundings volume is huge and the surroundings compressor exhaust volume is small, when the pneumatic tools begin, the exhaust pressure of the surroundings compressor will be significantly reduced, but the pneumatic tools can not be driven. Of program, additionally it is wrong to pursue large exhaust capacity blindly, since the larger the exhaust capability, the larger the electric motor allocated by the air flow compressor, not merely the higher the purchase price, but also a waste materials of buying funds, and the usage of electricity and energy will be wasted.
Consider the mixture of gas fields and conditions.
If the usage of air space is narrow, it should be vertical; when there is a long-distance modification in the utilization of air (a lot more than 500 m), mobile type should be considered; if the use of electricity can’t be used, diesel engine traveling type ought to be selected; if there is no circulating drinking water in the use of occasions, air-cooled type should be selected. In the air-cooled and water-cooled cooling modes, many users have a wrong proven fact that water-cooled is good, but in fact it is not. The air-cooled type makes up about more than 90% of the tiny compressors at home and abroad. This is since the air-cooled type is simple in design no water source is needed used. There are four fatal shortcomings of water-cooled compressor: it will need to have a complete upper and lower water program with large investment; water-cooled cooler has brief life; it is simple to freeze the cylinder in winter in the north; it will waste a whole lot of water in normal operation.
After that consider the compressed air quality.
Generally, compressed air produced by air compressor contains a particular quantity of lubricating oil and water. In some cases, it really is prohibited from oil and water. At this time, attention should be paid not only to selecting compressor, but also to the addition of 
auxiliary gadgets when necessary.
Lastly, it really is to expand the data of reference.
1. Balance: With the strong rise of China’s overall economy and the continuous 
emancipation of the minds of all kinds of manufacturers, manufacturers all over the country are busy with creation work. Along the way of production, surroundings compressors, which play a significant role, are often fully loaded and operate all-weather. In the entire production of factories, air flow compressor gas production is unstable, which is an extremely troublesome thing, often provides incalculable losses. Therefore, when we purchase atmosphere compressors, the initial criterion is the stability of surroundings compressors. At the moment, some high-end brands both in the home and abroad can meet this requirement. With the mature technology of adjustable frequency air compressor, it can be thought to meet this requirement.
2. Gas production: The second reason is gas production. Some enterprises possess very high quality of gas. For instance, in the pharmaceutical sector, basically the gas they need is oil-free. In this respect, it is still based on the enterprise’s very own situation. If the enterprise has a high demand for this, then it has been a long period to purchase more well-known machines. If the demand is not high, it depends on other situations. As the near future development pattern of the air flow compressor industry, the adjustable frequency air compressor is still very superb in gas production, since the variable frequency air flow compressor includes a prominent characteristic of monitoring gas creation, and at the same time the gas quality created is very considerable.
3. Power consumption: That is a comparatively important place as well as the focus of conversation, because surroundings compressor, as a simple equipment, is generally operated all-weather, and surroundings compressor itself is an extremely power-consuming equipment, the overall manufacturer of air flow compressor power consumption makes up about 20-30% of the total plant power usage. If effective control, the effect is very apparent. Many domestic enterprises are now pursuing the base price. In fact, underneath price is rather one-sided. For general production enterprises, the price of surroundings compressor only makes up about 5% of the full total cost of air compressor, 9% of the maintenance and labor costs, and 86% of the total cost of energy. Therefore, considering the final expenditure, the frequency transformation air compressor must be much lower compared to the ordinary surroundings compressor. Frequency conversion air compressor is the first expenditure, but invest the the electricity cost into account, you can really calculate a bill. Today, the general energy-saving amount of rate of recurrence converter atmosphere compressor is very objective, and the domestic professional regularity converter air compressor, its power-saving rate is as high as 30%, usually within a yr can recover the difference. Therefore, whenever choosing air compressor, choosing an excellent variable frequency air flow compressor is really the very best answer to the problem of power consumption.