Don't worry when the noise of Roots blower increases. First stop the blower to check what's going on. If you can't find the reason, consult the manufacturer of Roots blower for technical professional overhaul. No matter what the quality characteristics of Roots blower are, it can't be lower than the maintenance work at ordinary times. Only do a good job in the maintenance of Roots blower can make the fan live longer.
Roots blower is a volume rotary blower, which uses two blade rotors to make relative movement in the cylinder to compress and transport gas. The main reasons for noise during operation are: the pulsating noise of air flow caused by the change of pipe cross sectional area during the pipeline transportation of gas; During the rotation of fan impeller, pressure fluctuation will occur due to the change of volume space, which will cause flow fluctuation noise; Flow pulsation noise caused by high and low pressure gas impact caused by sudden change of inlet area; Contact noise of high-speed gas with impeller and shell; The vibration noise caused by the tooth profile error in the process of gear engagement; Noise caused by poor bearing manufacturing accuracy; Bearing vibration noise caused by uneven force on impeller; Impact noise caused by rotor manufacturing error during impeller engagement.
Among them, aerodynamic noise plays a leading role and is also the most harmful, which needs to be considered in the process of noise control. According to the analysis of generation mechanism, aerodynamic noise mainly has two forms: one is the rotating noise caused by the load and thickness of fan blades; The other is vortex noise caused by boundary layer separation, vortex emission and turbulence fluctuation of fan blades. The rotating noise is generated by the fan blade working in the non viscous potential flow, and its frequency spectrum is often low to medium frequency, accompanied by a group of discrete frequency spikes; Whirlpool noise depends on the shape of the fan impeller, the flow velocity of the air flow relative to the body and the fluid viscosity, and generates high-frequency noise with continuous frequency spectrum. The higher the frequency, the stronger the directivity of the noise. Different fan parameters have different spectra. Frequency spectrum characteristics of fan noise: low-frequency noise if<500Hz, intermediate frequency noise if 500 ～ 1000Hz, and high-frequency noise if>1000Hz.
The noise intensity and frequency spectrum characteristics of Roots blower are not only related to the working static pressure of the fan, but also related to the flow and speed of the fan. For example, as the flow increases, the noise also increases, especially the high-frequency noise.
Solution to noise expansion of Roots blower:
1. When the working pressure rises due to pipe blockage, everyone must clean or replace the pipe
2. Vibration caused by improper installation of the transmission belt. At this time, check and reinstall the transmission belt cover;
3. If the motor bearing is damaged, replace it with a new rolling bearing;
4. Dust entering the roots blower causes abrasion, and the blower should be broken down (professional staff can be found, and it is not necessary to disassemble it at will
5. No grease will also cause high noise. At this time, check the oil system software provided;
6. The lubrication is poor, and the drip injector and oil filter should be cleaned frequently;
7. The belt pulley is loose and the jacking screw is tightened;
8. The V-belt deviates, and adjust the tension of the drive belt.
I believe that after reading the above contents, you should also know how to control the noise in the daily operation of Roots blower. I hope it will be helpful to you.
Text term label: Roots blower
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