First, we should consider the exhaust pressure and the volume of the exhaust.

According to the national standard, the exhaust pressure of general purpose air compressor is 0.7 MPa (7 atmospheric pressure) and the old standard is 0.8 MPa (8 atmospheric pressure). Because the design working pressure of pneumatic tools and wind machinery is 0.4 Mpa, the working pressure of air compressor can fully meet the requirements. If the air compressor used by the user is larger than 0.8MPa, it should be specially manufactured. The method of forced pressurization can not be adopted to avoid accidents.

The size of the exhaust is also one of the main parameters of the air compressor. Choosing the air volume of the air compressor should match its own exhaust volume and leave a 10% margin. If the air volume is large and the air compressor exhaust volume is small, when the pneumatic tools start, the exhaust pressure of the air compressor will be greatly reduced, but the pneumatic tools can not be driven. Of course, it is also wrong to pursue large exhaust capacity blindly, because the larger the exhaust capacity, the larger the motor allocated by the air compressor, not only the higher the price, but also a waste of purchasing funds, and the use of electricity and energy will be wasted.

Consider the combination of gas fields and conditions.

If the use of air space is narrow, it should be vertical; if there is a long-distance change in the use of air (more than 500 m), mobile type should be considered; if the use of electricity can not be used, diesel engine driving type should be selected; if there is no circulating water in the use of occasions, air-cooled type should be chosen. In the air-cooled and water-cooled cooling modes, many users have a wrong idea that water-cooled is good, but in fact it is not. The air-cooled type accounts for more than 90% of the small compressors at home and abroad. This is because the air-cooled type is simple in design and no water source is needed in use. There are four fatal shortcomings of water-cooled compressor: it must have a complete upper and lower water system with large investment; water-cooled cooler has short life; it is easy to freeze the cylinder in winter in the north; it will waste a lot of water in normal operation.

Then consider the compressed air quality.

Generally, compressed air produced by air compressor contains a certain amount of lubricating oil and water. In some cases, it is prohibited from oil and water. At this time, attention should be paid not only to the selection of compressor, but also to the addition of auxiliary devices when necessary.

Lastly, it is to expand the knowledge of reference.

1. Stability: With the strong rise of China's economy and the constant emancipation of the minds of all kinds of manufacturers, manufacturers all over the country are busy with production work. In the process of production, air compressors, which play an important role, are often fully loaded and operate all-weather. In the full production of factories, air compressor gas production is unstable, which is a very troublesome thing, often will bring incalculable losses. Therefore, when we purchase air compressors, the first criterion is the stability of air compressors. At present, some high-end brands both at home and abroad can meet this requirement. With the mature technology of variable frequency air compressor, it can be said to meet this requirement.

2. Gas production: The second is gas production. Some enterprises have very high quality of gas. For example, in the pharmaceutical industry, basically the gas they want is oil-free. In this regard, it is still based on the enterprise's own situation. If the enterprise has a high demand for this, then it has been a long time to purchase more well-known machines. If the demand is not high, it depends on other circumstances. As the future development trend of the air compressor industry, the variable frequency air compressor is still very excellent in gas production, because the variable frequency air compressor has a prominent characteristic of tracking gas production, and at the same time the gas quality produced is very considerable.

3. Power consumption: This is a relatively important place and also the focus of discussion, because air compressor, as a basic equipment, is generally operated all-weather, and air compressor itself is a very power-consuming equipment, the general manufacturer of air compressor power consumption accounts for 20-30% of the total plant power consumption. If effective control, the effect is very obvious. Many domestic enterprises are now pursuing the base price. In fact, the bottom price is rather one-sided. For general production enterprises, the purchase price of air compressor only accounts for 5% of the total cost of air compressor, 9% of the maintenance and labor costs, and 86% of the total cost of electricity. Therefore, considering the final expenditure, the frequency conversion air compressor must be much lower than the ordinary air compressor. Frequency conversion air compressor is only the first investment, but if you take the electricity cost into account, you can really calculate a bill. Nowadays, the general energy-saving amount of frequency converter air compressor is very objective, and the domestic professional frequency converter air compressor, its power-saving rate is as high as 30%, usually within a year can recover the difference. Therefore, when choosing air compressor, choosing a good variable frequency air compressor is really the best solution to the problem of power consumption.