The sound insulation cover of Roots blower determines the thickness of the sound insulation cover plate and the material of the plate according to the type and amount of noise. The multi-layer plate is integrated as a whole, and each layer has unique effects. Therefore, the noise reduction effect of different equipment can be achieved by adjusting the material and thickness of each layer. For noise reduction of Roots blower equipment, the sound insulation cover cannot be fully enclosed, otherwise the Roots blower cannot work normally, so a silencer will be installed on the sound insulation cover for the inlet and outlet of Roots blower to ensure the normal operation of the equipment on the one hand, and reduce the noise at the inlet and outlet of Roots blower on the other hand. The detailed means for noise control of Roots blower shall be determined according to the site conditions, and the sound insulation cover and muffler are only two necessary equipment for noise reduction of Roots blower. In order to achieve the desired effect, various noise reduction details need to be determined according to the site conditions.
Under normal conditions, the aerodynamic noise radiated from the inlet and outlet of Roots blower is 10-20 dB higher than the noise radiated from other parts. Therefore, when controlling the noise of Roots blower, appropriate silencers should be installed on the inlet and exhaust pipes at first. The Roots blower is equipped with silencers. At present, resistance silencers are widely used in China, 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 Roots blower unit with a closed box sound enclosure. The key of its skill is how to ensure the normal operation of Roots blower with cooling method. 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 there is a special Roots blower room for the three leaf Roots blower, the method of transforming the existing Roots blower room into a sound insulation room can be adopted based on the site conditions. Namely, the fan shall be blocked in the Roots blower 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 wrapping In order to reduce the noise radiated from the air duct of the three leaf roots blower, the pipe can be wrapped in a rotary manner, and the noise can be conveyed through the box. 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.
The noise control of Roots blower shall generally be considered from three aspects:
(1) No noise from the sound source
(2) Take control measures on the noise transmission path;
(3) Take protective measures at noise receiving points, that is, use earplugs, ear muffs and other sound proof appliances for personal protection.
Noise reduction procedures
Noise control can be roughly divided into two situations:
First, for new projects, noise control shall be considered in the project design phase;
Second, the project has been completed, and it is found that the noise of Roots blower is large during operation, which needs to be treated. In contrast, the former has strong initiative and large room for maneuver, so a more reasonable noise control scheme can be determined according to needs and possibilities; The latter is restricted by many factors, so it is usually necessary to take into account the original conditions and take some remedial measures.
The basic working procedures of noise control are as follows:
1. Understand the noise source and its transmission path
For Roots blower, master the technical data such as noise size and frequency spectrum characteristics, understand the distribution of various noise sources including Roots blower, and draw the noise distribution map as required.
2. Determine the amount of noise reduction
Compare the noise data of the fan with the noise control target to determine the decibel value to be reduced.
According to China's industrial enterprise noise health standard, the noise standard of industrial enterprise workshops and workplaces is 85dB. If the existing enterprises fail to meet this standard temporarily after efforts, it can be appropriately relaxed, but it shall not exceed 90dB.
Text term label: Roots blower
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