What are the factors that affect the displacement of the screw air compressor?

The displacement of the screw air compressor directly reflects the ability of the air compressor to deliver air. In the actual use of the air compressor, the actual displacement is often less than the theoretical displacement. What affects the air compressor? What about the displacement?

1. Leakage

(1) Internal leakage, that is, gas blowing between stages. The compressed gas is poured back for a second compression. It will affect the working conditions of each stage, increase the pressure ratio of the low-pressure stage, and decrease the pressure ratio of the high-pressure stage, so that the entire compressor deviates from the design working condition and the displacement decreases;

(1) External leakage, that is, air leakage from the shaft end seal to the outside of the casing. Although the suction volume remains the same, part of the compressed gas leaks, resulting in a decrease in the exhaust volume.

2. Inhalation state

The screw air compressor is a volumetric compressor that compresses the volume of air. Although the volume of gas that can be inhaled will not change, the discharged gas will be changed by the density of the inhaled gas. The higher the temperature, the more the air expands and the density of the gas decreases. After compression, the mass will be greatly reduced, and the displacement will also be reduced. At the same time, it is affected by the pressure of the suction pipeline. The greater the pressure, the more affected the suction resistance, which reduces the gas output.

3. Cooling effect

(1) Poor cooling of the cylinder or inter stage cooler will cause the inhaled air to be preheated, thereby reducing the air intake of the air compressor;

(2) Oil cooling is used in the rotor of the screw air compressor. One of the purposes is to reduce its temperature. When the lubricating oil in the rotor of the screw air compressor is insufficient and the cooling effect is not good, the temperature will rise. , The displacement of the screw air compressor will also be reduced.

4. Speed

The exhaust volume of the screw air compressor is directly proportional to the speed of the equipment, and the speed often changes with the influence of the voltage and frequency of the power grid. When the voltage is reduced or the frequency is reduced, the speed will drop, which reduces the displacement.

The above are some of the most basic causes of changes in the displacement of air compressors. I hope to give users some references. Adjust the machine according to their own working conditions and do a good job of maintenance, so that the specific power of the nameplate will be achieved as much as possible.