Relationship between air pressure and air volume of screw air compressor

There is a close relationship between the air pressure and the air volume (exhaust volume) of the screw air compressor, and this relationship is affected by many factors. The following is a detailed analysis of the relationship between air pressure and air volume of screw air compressor:

1. basic concepts

• gas pressure (exhaust pressure): Refers to the pressure of the gas discharged from the screw air compressor, usually in bar (bar) or megapascal (MPa).
• Gas volume (exhaust volume): Refers to the volume of gas discharged by the screw air compressor per unit time, usually in cubic meters per minute (m & sup3;/min) or standard liters per minute (L/min).

2. relationship analysis

1. effect of compression ratio:

   • compression ratio definition: Refers to the ratio of exhaust pressure to intake pressure.
   • Relationship: As the compression ratio increases, the air is compressed more severely between the screw rotors and the density of the air increases. However, an excessively high compression ratio will reduce the compressibility of the air and increase the risk of air leakage during the compression process.
   • Impact: A high compression ratio may reduce the amount of air actually involved in compression and discharged, thereby reducing the exhaust volume.

2. Effect of speed:

   • relationship: The speed of the screw air compressor is an important operating parameter that affects the exhaust pressure and exhaust volume.
   • Impact: The increase in speed will make the screw rotor complete more suction, compression and exhaust cycles per unit time. Within a certain range, the increase in speed will lead to an increase in intake and exhaust volume. However, an excessively high speed may cause the residence time of the air in the screw rotor to be too short and cannot be fully compressed, which will affect the further increase of the exhaust pressure and increase the wear and mechanical vibration of the rotor.

3. Effect of load variation:

   • relationship: Load changes (that is, changes in the demand for compressed air by downstream gas equipment) will affect the exhaust pressure and displacement 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 volume, thereby increasing the exhaust volume. But too high load may cause the exhaust volume can not meet the demand, and cause the exhaust pressure fluctuation. Conversely, when the load is reduced, the exhaust pressure may increase. If not properly controlled, excessive exhaust pressure may cause damage to equipment and pipelines.

4. Effect of leakage:

   • source of leakage: During the operation of the screw air compressor, gas leakage will occur due to the gap between the rotors and between the rotor and the housing.
   • Impact: Leakage will reduce the amount of air actually involved in compression and discharged, thereby reducing the exhaust volume. At the same time, leakage will also affect the stability and accuracy of the exhaust pressure.

3. optimization measures

1. reasonable setting of pressure parameters: Set appropriate exhaust pressure parameters according to actual needs to avoid excessive pressure leading to increased energy consumption and equipment wear.
2. Optimized speed control: Optimize the speed control of the screw air compressor by means of frequency conversion technology to achieve the optimal balance of exhaust volume and exhaust pressure.
3. Strengthen maintenance: Regularly inspect and maintain the various parts of the screw air compressor to reduce leakage and wear, and improve the operating efficiency and stability of the equipment.
4. Piping System Design Optimization: Reasonably design the compressed air pipeline system to reduce pipeline resistance and leakage points, and improve the efficiency of compressed air transportation.

4. Summary

there is a close relationship between the air pressure and the air volume (exhaust volume) of the screw air compressor. Through reasonable setting of pressure parameters, optimization of speed control, strengthening maintenance and optimization of pipeline system design, the optimal balance of exhaust volume and exhaust pressure can be realized, and the operation efficiency and stability of equipment can be improved. In practical application, it needs to be comprehensively considered and adjusted according to specific needs and conditions.