What is the reason why the screw air compressor is loud?

Screw air compressor sound is usually the result of a variety of factors. Here are some of the main reasons and their explanations:

1. mechanical factors

1. motor noise:
   • the motor noise of screw air compressor is mainly composed of mechanical noise, electromagnetic noise and ventilation noise. Among them, ventilation noise is often large, followed by mechanical noise, and electromagnetic noise is relatively small.
   • The high speed of the motor will cause the vibration of the machine body, and then produce a large noise.
2. Mechanical vibration:
   • the friction sound and vibration sound generated by the rotor, bearing, gear and other moving parts of the air compressor during high-speed operation are the main source of mechanical noise.
   • Imbalance or improper installation of equipment may also cause increased vibration, which in turn increases noise.

2. Aerodynamic Factors

1. duct intake noise:
   • the velocity pulsation or pressure pulsation of the gas in the intake pipe will cause the sound of the gas at the gas port, that is, the intake noise. Since the inlet is usually connected to the air source end, the intake noise is often greater than the main noise in other parts.
2. air valve noise:
   • as the gas valve is activated and the gas flow at the gas valve channel changes, it will cause gas sound and solid sound at the gas valve. When the screw air compressor is working, the switches of the intake valve and the exhaust valve cooperate with each other to make the exhaust pulsating, resulting in excitation noise. The more intense the airflow pulsation, the greater the noise.

3. design factors

1. equipment structure:
   • the unreasonable design of the equipment or the poor fit between the components may also lead to increased noise. For example, the damage of the fan blade or the slight collision friction with the fan cover will cause noise.

4. failure factors

1. equipment failure:
   • damage to the internal parts of the air compressor (such as bearing wear, poor gear meshing, etc.) will cause the impact and friction between the parts to increase, resulting in greater noise. This type of noise is usually loud and harsh, and is easier to spot.

5. other factors

1. poor lubrication:
   • poor internal lubrication of the air compressor will lead to increased dry friction and noise.

Solution

in view of the problem of large sound of screw air compressor, the following measures can be taken to reduce noise:

1. optimize equipment structure: By improving the equipment design, the friction and vibration of moving parts are reduced, thereby reducing mechanical noise.
2. Add buffer device: Add orifice plate, venturi tube, buffer tank and other buffer devices in the pipeline to reduce the noise generated by airflow pulsation.
3. Additional sound insulation measures: Set up a sound insulation wall or sound insulation cover around the equipment to block the propagation path of sound waves. For small and medium-sized air compressors, a detachable structural sound insulation cover can be installed; for large air compressors, an independent sound insulation room can be set.
4. Installing muffler: Install silencers at the inlet and outlet of the screw air compressor to properly reduce noise.
5. Control operation parameters: Reduce noise by controlling the operating parameters of the screw air compressor (such as speed, load rate, etc.). Usually, reducing the speed can reduce the noise when the machine is running.
6. Timely maintenance: Regularly inspect and maintain the air compressor, find and repair faulty parts in time, and prevent noise caused by damage to parts.
7. Replace variable frequency air compressor: Consider buying a variable frequency air compressor (especially a permanent magnet variable frequency air compressor). This type of air compressor can save electricity while reducing noise.

In summary, the reasons for the loud screw air compressor involve mechanical, aerodynamic, design, failure and other aspects. By taking targeted measures, the noise level of the air compressor can be effectively reduced, and a more quiet and comfortable working environment can be created for employees.