What are the noise sources of Roots blower?

What are the noise sources of Roots blower? In the process of noise control of Roots blower, the technical level of noise control was eliminated, which led to the following reasons:

The noise source of Roots blower mainly comes from the cylinder, inlet and outlet pipes, air filter and motor. Among them, the noise at the cylinder is the aerodynamic noise and vibrating mechanical noise generated by the compressed air moving the rotor, and the measured noise value is 104dB (A); The noise at the inlet and outlet pipes and air filters is aerodynamic noise and vibrating mechanical noise caused by large pressure changes, and the measured noise value is 100dB (A); The noise at the motor is mainly the electromagnetic noise of motor operation, the aerodynamic noise of motor fan rotation, and the mechanical noise of belt rotation. The measured noise value is 101dB (A).

In the process of noise control of Roots blower, the technical level of noise control was eliminated, which led to the following reasons:

① As the vibration reduction construction was not done well before the installation of Roots blower, especially for some petrochemical units built earlier, the vibration reduction construction was not considered when the plant was built and installed, and petrochemical enterprises could not stop at will or for a long time for operations such as replacing the vibration reduction foundation of the blower, resulting in more difficult noise control of high-pressure fans such as Roots blower.

② In order to ensure the long-term safe operation of Roots blower, the enterprise has improved the patrol inspection and maintenance frequency of high-pressure fans such as Roots blower and the controllability of motor temperature. The existing fan acoustic enclosures are fully enclosed and have limited space, which seriously affects the implementation of patrol inspection and maintenance operations such as vibration measurement, temperature measurement, lubricating oil replacement, anti-corrosion paint painting, etc. of the fan. In addition, poor ventilation seriously affects the heat dissipation of the motor, resulting in frequent fan shutdown and burning accidents due to motor overheating.

③ Petrochemical enterprises generally carry out a major overhaul of the whole plant once every 4-5 years, and carry out flaw detection, correction, maintenance, replacement and other operations for each component. At that time, high-pressure fans such as Roots fans will be removed from the base, and the fully enclosed sound insulation cover will also be removed. In many cases, it is found that the sound insulation cover cannot be installed as before after removal; In addition, the disassembly process led to the deformation of the sound insulation plate, resulting in the loss of the sound insulation cover due to the inability to install and return, which greatly reduced the heat dissipation and sound insulation effect