Vacuum pump is widely used in various industries. Used to pump gas containing high steam after condenser cooling air, vacuum pump with low noise, intermediate frequency is given priority to, the current to curb vacuum pump air emissions, noise in the world has a variety of types of vacuum pump exhaust silencer, its principle is mostly adopts multilevel throttling depressurization, due to the complicated structure, weight big, difficult to repair, thus limits its application scope, how to more thoroughly solve the problem of vacuum pump noise control, extensive concern to the people.
Noise source of vacuum pump:
1. Mechanical noise of vacuum pump unit during operation, door and window are not controlled by noise, and strong indoor noise is transmitted outward through doors and Windows.
2. Aerodynamic noise. Pressure pulsation and eddy current noise are caused by the change of exhaust volume.
3. Solid sound transmission, the outdoor part of the exhaust pipe generates resonance and radiates strong noise outwards.
4. The impact of the rotary blade on the cylinder body, the sound of the pressure oil in the residual volume of the pump and the exhaust dead gap;
5. Impact of exhaust valve disc on valve seat and supporting parts;
6. Echo in the box and sound of bubble cracking;
7. Bearing noise;
8. Noise caused by large amount of gas and oil impacting the oil baffle;
9. Others. Such as the noise caused by transmission, fan noise of air-cooled pump, etc.
10, motor noise, which is a crucial factor.
Noise control scheme of vacuum pump:
1. The noise control scheme of vacuum pump is mainly sound insulation and noise elimination + comprehensive control measures including pipeline damping, vibration reduction, pipeline modification, indoor ventilation, heat dissipation and noise elimination.
2. Exhaust muffler of vacuum pump with noise reduction of over 20dBA. The air passage section of the vacuum pump exhaust system has the characteristic of multiple abrupt changes. Muffler is divided into four Chambers, shell and baffle plate manufacturing, micro-perforated structure for the double-layer stainless steel sheet processing.
3. Damping treatment of noise control pipe in vacuum pump station. Cover the exhaust pipe with damping material, wrap it with glass wool and wrap it with glass cloth.
4. Others. (sound insulation and shock absorption measures can be added according to the actual situation)
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