The relationship between gas pressure and gas volume of screw air compressor

There is a close relationship between the gas pressure and the gas volume (discharge volume) of the screw air compressor, which is affected by a variety of factors. The following is a detailed analysis of the relationship between gas pressure and gas volume of the screw air compressor: 1. Basic concepts

• Gas production pressure (exhaust pressure): refers to the pressure of the gas discharged by the screw air compressor, usually in bar (bar) or megap (MPa).
• Gas volume (discharge volume): refers to the volume of gas discharged by a screw air compressor in unit time, usually in cubic meters per minute (m³/min) or standard liters per minute (L/min).

2. Relationship analysis

1. The influence of compression ratio:
   • Definition of compression ratio: refers to the ratio of exhaust pressure to intake pressure.
   • Relationship: With the increase of the compression ratio, the air is compressed more severely between the screw rotors, and the density of the air increases. However, excessively high compression ratio will lead to reduced compressibility of air and increase the risk of leakage of air during compression.
   • Impact: High compression ratios may lead to a decrease in the amount of air actually involved in compression and discharge, thereby reducing the amount of exhaust.
2. Influence of speed:
   • Relationship: The rotation speed of a screw air compressor is an important operating parameter that affects the exhaust pressure and exhaust volume.
   • Impact: Increased speed will allow the screw rotor to complete more inhalation, compression and exhaust circulation per unit time. Within a certain range, an increase in rotational speed will lead to an increase in inhalation and exhaust volume. However, excessively high speed may cause the air to stay in the screw rotor too short and cannot be fully compressed, which will affect the further increase of exhaust pressure and increase the wear and mechanical vibration of the rotor.
3. Impact of load changes:
   • Relationship: Load changes (i.e., changes in the demand for compressed air from downstream gas equipment) will affect the exhaust pressure and exhaust volume of the screw air compressor.
   • Impact: When the load increases, if the air compressor has sufficient capacity to adjust, it will try to meet the load demand by increasing the intake amount, thereby increasing the exhaust volume. However, excessive load may cause the exhaust volume to fail to meet the demand and cause the exhaust pressure.fluctuation. Conversely, when the load is reduced, the exhaust pressure may rise, and if not properly controlled, excessive exhaust pressure may cause damage to the equipment and ducts.
4. Impact of Leakage:
   • Source of Leakage: During operation of the screw air compressor, gas leakage will occur due to gaps between the rotor and between the rotor and the shell.
   • Impact: Leakage can lead to a decrease in the amount of air actually involved in compression and discharge, thereby reducing the amount of exhaust. At the same time, leakage will also affect the stability and accuracy of exhaust pressure.

3. Optimization measures

1. Reasonably set pressure parameters: Set appropriate exhaust pressure parameters according to actual needs to avoid excessive pressure causing increased energy consumption and equipment wear.
2. Optimized speed control: Optimize the speed control of the screw air compressor through frequency conversion technology and other means to achieve an optimized balance between exhaust volume and exhaust pressure.
3. Strengthen maintenance: Regularly inspect and maintain various components of the screw air compressor to reduce leakage and wear, and improve the operating efficiency and stability of the equipment.
4. Pipe system design optimization: Rationally design compressed air piping systems to reduce pipeline resistance and leakage points, and improve the conveying efficiency of compressed air.

4. Summary

There is a close relationship between the gas production pressure and the gas volume (discharge volume) of the screw air compressor. By reasonably setting pressure parameters, optimizing speed control, strengthening maintenance and optimizing pipeline system design, the optimization of exhaust volume and exhaust pressure can be achieved, and the operation efficiency and stability of the equipment can be improved. In practical applications, comprehensive consideration and adjustment are needed according to specific needs and conditions.