How to choose the right air compressor model has always been a challenge for air compressor buyers. To help businesses purchase cost-effective products, Zhongshan Shunli summarizes the air compressor selection process into three steps: first, determine the working pressure; second, determine the corresponding volumetric flow rate; and finally, determine the supply capacity. Let's illustrate this with an example.
The relationship between power, working pressure, and volumetric flow rate is as follows: with constant power, changes in rotational speed will change both the volumetric flow rate and the working pressure. For example, a 22KW air compressor, manufactured with a working pressure of 7 bar, has a displacement of 3.8 m³/min calculated based on the compressor's technical curve. When the working pressure is set to 8 bar, the rotational speed must be reduced (otherwise the drive motor will be overloaded). At this point, the discharge volume is 3.6 m³/min; because a lower speed results in a corresponding reduction in exhaust gas, and so on.
Power selection involves ensuring that the power supply capacity meets the power requirements of the drive motor while satisfying the working pressure and volumetric flow rate.
These three points, along with the previous section "How to Choose an Air Compressor," should be very helpful for those purchasing air compressors. Below, we'll discuss air compressor selection using some data.
1. Generally, when purchasing gas equipment, the gas consumption and operating pressure of the equipment can be provided.
Based on these given values, the known standard parameters of the air compressor can be used.
For example: A certain piece of equipment has a gas consumption of 0.83 m³/min and an operating pressure of 0.4-0.6 MPa.
Selection: WW-0.9/7-C
Parameters: Discharge volume: 0.9 m³/min, Discharge pressure: 0.7 MPa
2. In the absence of reference data, the gas consumption and operating pressure can only be calculated based on past experience or by engineers.
Usually, a 30% margin should be added to the calculation result to approximate the standard parameters.
For example: The calculated air consumption of a certain device is 0.4 m³/min, and the working pressure is 0.6-0.8 MPa.
Selection: Considering a margin, air consumption = 0.4 × (130%) = 0.52 m³/min
According to standard model: WW-0.6/10
Parameters: Discharge volume: 0.6 m³/min, Discharge pressure: 1.0 MPa