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How to solve the noise problem of roots blower?

Source: Roots blower manufacturer Release time: 2023-02-18 Hits:

  Roots Blower The noise during operation is quite high. The noise level at the inlet of a single machine is 96-117dB (A), and the noise level at the outlet is 105-125dB (A). When multiple roots blowers operate at the same time, the total superimposed noise level in the roots blower room usually exceeds 110dB (A). When the noise A level of roots blower reaches 80dB, ordinary conversation cannot be heard clearly; When it reaches 90dB, talk loudly; It reaches 100-110dB, even if you shout loudly, you can't hear clearly. Generally, the noise level of the blower room is far beyond the noise limit value of the workshop and workplace in GBJ87-1985 Code for Design of Noise Control in Industrial Enterprises. The specification stipulates that in the production workshops and workplaces, workers are exposed to noise for 8h every day, and the noise limit is 90dB (A). If the daily exposure time is less than 8h, it shall be determined according to the principle of halving the actual exposure time and increasing the noise limit by 3dB (A). That is, the noise limit of 4h contact time is 93dB (A); The noise limit of 2h exposure time is 96dB (A); The noise limit of 1h exposure time is 99dB (A).

       

Roots blower

Causes and solutions for scratches on Roots blower impeller, shell and wallboard:
1. The installation clearance is incorrect; Readjust the clearance;
2. The working pressure is too high, exceeding the specified value; Detect the cause of overload and reduce the pressure to the specified value;
3. The working temperature is too high; Check the installation accuracy and reduce the pipeline tension;
4. The shell or base is deformed, and the fan positioning is invalid; Recovery;
5. The axial positioning of the bearing is not good. Check the bearing and ensure the clearance.
The pressure of Roots blower is determined by resistance:
The pressure of Roots blower changes with the external resistance to it. When the load of the motor is exceeded, the motor will automatically stop. This is the thermal protection of the motor, which also exceeds the load of the fan. Therefore, it is necessary to replace a large motor. The high or low speed of Roots blower and the high or low pressure of the fan determine the noise value of the fan and the quality of the fan, The higher the fan speed and pressure, the higher the fan noise. The rotation speed of roots blower is also a factor determining the air volume of the fan. The higher the rotation speed of the same type of fan, the greater the air volume and noise of the fan. The same type of motor with the same rotation speed is matched with the same large motor. The higher the pressure, the smaller the air volume of the fan. The same type of air volume, the greater the pressure, the smaller the air volume of roots blower under different pressures, The smaller the pressure, the larger the air volume.
Common methods for noise control of Roots blower:
Under normal conditions, the aerodynamic noise radiated from the air inlet and exhaust of the fan is 10-20 decibels higher than the noise radiated from other parts. Therefore, when controlling the fan noise, appropriate silencers should be installed on the air inlet and exhaust pipes at first. Mufflers are used on fans. At present, resistance silencers are used in domestic and international markets, while silencers with large volume and narrow silencing channel are rarely used. Of course, the selection, design and device of silencers should be based on practical conditions.
The sound insulation cover method is to enclose the whole fan unit with a closed compartment sound cover. The key of its skill is how to use cooling methods to ensure the normal operation of the fan. At present, air cooling is the most popular method in the country. The primary cooling methods are: self fan ventilation cooling method, negative pressure suction cooling method, air circulation ventilation cooling method inside the hood and external mechanical ventilation cooling method.
If Roots blower has a special fan room, it can connect the site conditions and accept the method of transforming the existing fan room into a sound insulation room. Namely, the fan is blocked in the fan room so that its noise cannot be transmitted. The primary technical measures are to use sound insulation doors, sound insulation windows, sound insulation screens and walls for sound insulation, and use appropriate sound absorption materials.
Pipe binding In order to reduce the noise radiated from the Roots blower air duct, the pipe can be wrapped in a rotating manner, so as to eliminate the way of noise transmission. Pipeline binding method. Considering the factors of safety, stability and convenient maintenance, the vibration isolator is designed and selected to eliminate the rigid connection between machinery and unit, and then reach the goal of reducing solid vibration noise.