2026-04-10Views：
For the screw air compressor should be how to select, you first need to know the work flow of the screw air compressor, and then determine how to select.
Generally speaking, there are three steps:(1) first determine the working pressure;(2) then set the corresponding volume flow;(3) finally, the power supply capacity.
Selection of working pressure (exhaust pressure):
when the user is going to purchase an air compressor, first determine the working pressure required by the gas end, add a margin of 1-2 bar, and then select the pressure of the air compressor (the margin is to consider the pressure loss from the installation site of the air compressor to the actual gas end pipeline distance, and appropriately consider the pressure margin between 1-2 bar according to the length of the distance).
Of course, the size of the pipeline diameter and the number of turning points are also factors that affect the pressure loss. The larger the pipeline diameter and the fewer turning points, the smaller the pressure loss; on the contrary, the greater the pressure loss.
Therefore, when the distance between the air compressor and each gas end pipeline is too far, the main pipe diameter should be appropriately enlarged. If the environmental conditions meet the installation requirements of the air compressor and the working conditions permit, it can be installed nearby at the gas end.
Selection of volume flow:
when selecting the volume flow of the air compressor, you should first understand the volume flow of all the gas equipment, and multiply the total flow by 1.2 (that is, 20% of the margin);
② The new project will be selected according to the flow value provided by the design institute;
③ Learn about the volume flow parameters of the gas-using equipment from the gas-using equipment supplier for selection;
④ Air compressor station modification can refer to the original parameter value combined with the actual gas situation for selection;
appropriate selection is beneficial to the user himself and the air compressor equipment. Excessive selection is wasteful, and too small selection may cause the air compressor to be in a loading state for a long time or use insufficient gas or pressure cannot be used.
The relationship between power and working pressure and volume flow
under the condition of constant power, when the rotation speed changes, the volume flow and working pressure also change accordingly. For example, for a 22KW air compressor, the working pressure is determined to be 7bar during manufacture, and the rotation speed is calculated according to the technical curve of the compressor host, and the displacement is 3.8 m3/min; When the working pressure is determined to be 8bar, the rotation speed must be reduced (otherwise the drive motor will be overloaded). At this time, the exhaust volume is 3.6 m3/min; because the speed is reduced, the exhaust gas is correspondingly reduced, and so on.
The selection of power is to meet the working pressure and volume flow conditions, the power supply capacity can meet the matching drive motor power can be.
Therefore, the steps of the optional air compressor are: first determine the working pressure, then set the corresponding volume flow, and finally the power supply capacity.
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