2026-04-10Views：
air compressor selection need to know what parameters
working pressure of air compressor]
there are many representations of pressure units. Here we mainly introduce the commonly used pressure representation units of screw air compressors; ① Working pressure, which is often called exhaust pressure by domestic users. Working pressure refers to the highest pressure of the air compressor discharge gas; ② Common working pressure units are: bar or Mpa ,1 bar = 0.1 Mpa ; ③ In general, users usually call the pressure unit: Kg (kg),1 bar = 1Kg.
Volume flow of air compressor]
① volume flow, domestic users often called displacement. The volume flow refers to the volume of gas discharged by the air compressor per unit time under the required exhaust pressure, which is converted to the intake state. ② Volume flow unit: m3/min (cubic/min) or L/ min (l/min),1m3 (cubic) = 1000L (l); ③ General, commonly used flow unit: m3/min (cubic/min); ④ Volume flow is also called displacement or nameplate flow in our country.
air compressor power]
① Generally, the power of the air compressor refers to the nameplate power of the matching drive motor or diesel engine; ② The unit of power is: KW (kilowatt) or HP (horse/horsepower),1KW & asynmp; 1.333HP. Selection of working pressure (exhaust pressure): when the user is going to purchase an air compressor, he must first determine the working pressure required by the air end, add a margin of 1-2 bar, and then select the pressure of the air compressor (the margin is considered from the installation site of the air compressor to the actual air end
the pressure loss of the pipeline distance, according to the length of the distance between 1-2 bar, properly consider the pressure margin).
[The relationship between power and working pressure and volume flow]]
under the condition of constant power, when the rotation speed changes, the volume flow air compressor 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 rotating speed must be reduced (otherwise the driving motor will be overloaded), the air compressor displacement is 3.6 m3/min; because the speed is reduced, the exhaust is reduced accordingly, and so on.
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