There are various types of compressors (screw compressors, reciprocating compressors, etc.) used in the technique as a source of compressed air. In compressors of this type of compressed air in a confined space cylinder by the reciprocating motion of the piston. Structurally, they represent a unit that includes a compressor head, the electric drive, a receiver and an automatic pressure control (Pressure switch). The popularity of reciprocating compressors is determined by their low cost, acceptable weight and size parameters, simplicity of operation and maintenance and output characteristics, capable of meet the needs of virtually any enterprise. The main characteristics of the compressor are two parameters – the maximum pressure (Pmax) and volumetric productivity or supply (Q).
Most of the proposed compressors on the market today are developing a pressure requirements of standard pneumatic equipment and tools. The market offers compressors with a maximum pressure of 6, 8, 10, 16 bar. Recall that the nominal operating pressure paint guns – 3.4 bar, pneumatic tools – up to 6,5 bar. An exception is the pneumatic tire changers, for which many manufacturers recommend using compressed air at a pressure of 8.10 bar. However, Practice shows that the pneumatic tire changer equipment works reliably, and using 8-bar compressor. What else do you need to consider to determine the maximum pressure developed by the compressor? Firstly, should be borne in mind that the automatic pressure regulation of all compressors configured in such a way that maintains the pressure in the receiver with a tolerance of -2 bar, the maximum value. This means that in during compressor operation with Pmax-8 bar outlet pressure can range from 6 to 8 bar, 10-bar, – respectively, from 8 to 10 bar. Factory adjustment pressure switch can be modified only in the direction reduce the minimum pressure.
Secondly, be aware that the presence of extended pnevmomagistraley to consumers of compressed air causes a pressure drop in the line. When errors in the design of pneumatic (Use small-diameter tubes, using water shut-off devices, irrational laying roads, etc.), it can reach a significant magnitude and cause poor performance pneumatic equipment. To avoid possible trouble in such cases, should be preferred to the compressor with a higher maximum pressure. Some margin pressure is useful from another point of view. The higher pressure developed by the compressor, the greater mass of air it can pump into the receiver, and the longer the time the latter will be emptied to the minimum allowable pressure, allowing the compressor time to rest. By the way, about the rest: but if he needs an iron compressor? In response to this question lies the key to understanding the features of the workflow in the piston compressor. Considering it, determines the most important characteristic of the compressor – performance.