The relationship between air compressor power, pressure and volume flow

The relationship between air compressor power, pressure and volume flow

Air compressor terminology: What is the relationship between air compressor power, working pressure and volume flow? First, let's first understand the definition of the three.

　　Q: What is the working pressure of an air compressor?

　　Answer: The working pressure of an air compressor is often called the exhaust pressure by domestic users. Refers to the z* high pressure of the exhaust gas from the air compressor. The commonly used working pressure unit is: bar or Mpa, the conversion method is: 1 bar = 0.1 Mpa. Many users usually call the pressure unit Kg, and the conversion method is: 1 bar = 1 Kg.

　　Q: What is the volume flow of an air compressor?

　　Answer: Volumetric flow rate, domestic users often call the displacement or nameplate flow rate. It refers to the volume of gas discharged by the air compressor per unit time converted to the intake state under the required exhaust pressure. The volume flow unit is: m3/min or L/min. Generally, the commonly used flow unit is m3/min. The conversion method is: 1m3=1000L.

　　Q: What is the power of an air compressor?

　　 Answer: The power of the air compressor refers to the nameplate power of the matched drive motor or diesel engine. The unit of power is KW or HP. The conversion method is: 1KW ≈ 1.333HP.

　　① Generally, the power of the air compressor refers to the power of the matched drive motor or the nameplate of the diesel engine;

　　② The unit of power is KW (kilowatt) or HP (hp/horsepower), 1KW ≈ 1.333HP.

　　 Next, let’s look at the relationship between the three:

In the case of constant power, when the speed changes, the volume flow and working pressure also change accordingly; for example: a 22KW air compressor, the working pressure is determined to be 7bar at the time of manufacture, calculated according to the main compressor technical curve Speed, the displacement is 3.8 m3/min; when the working pressure is determined to be 8bar, the speed must be reduced (otherwise the drive motor will be overloaded), at this time, the displacement is 3.6 m3/min; because the speed is reduced, the displacement Qi also decreased accordingly, and so on.