Noise Source Analysis of Air Compressor
Air compressor is a kind of equipment with high noise. When installed outdoors, the noise of dh90-1 centrifugal air compressor at 2m is 114.5db (A).
The noise of air compressor includes aerodynamic noise, mechanical noise and electromagnetic noise. Radiated noise can be divided into: air compressor body noise source; motor noise source; intake pipe noise source; intake port noise source; exhaust pipe noise source; exhaust noise source. The noise spectrum of each component is measured by the near field method, which shows that the noise of the air compressor is medium and high frequency noise.
2. The most reasonable measure to control the noise of the air compressor body and motor is to add a sound insulation cover for the air compressor. In order to ensure the noise reduction effect of the sound insulation cover, attention should be paid to:
1. 外壳壁数据应具有足够的隔声能力。本工程采用多层隔声结构，设计隔声能力为30dB (A)。
1. Shell wall data should have adequate sound insulation. This project adopts multi-layer sound insulation structure, and the designed sound insulation capacity is 30dB (A).
Jinan air compressor
2. 门、窗、孔等隔音薄件的处理。在本工程中，门、采光窗和通风口应安装消声器。消声器结构的两个设计值为25dB (A)。
2. Processing of sound-proof thin parts such as doors, windows and holes. In this project, mufflers should be installed on doors, lighting windows and ventilation outlets. The two design values of muffler structure are 25dB (A).
3. The sound absorption treatment of the inner wall is strong. In this project, 50 mm thick centrifugal glass wool felt is used as sound absorption data. Its high frequency sound absorption performance is excellent, and it meets the requirements of controlling noise frequency characteristics. In order to increase low frequency sound absorption, 50 mm thick air layer is left after sound absorption data.
Because of the demand of consumers, the air compressor can not be shut down. In the design, the reinforced concrete seat of the original pneumatic tightener is applied, and the sound insulation cover is added into two parts. Because of the support of reinforced concrete support, the main keel structure of the sound insulation cover is simplified, which is convenient for the construction of machine operation. 70% of the lower part of the sound insulation cover can use brick wall, saving management funds. In order to meet the maintenance requirements of the equipment, the valve cover is removable to facilitate the mechanical operation of lifting; the glottis under the sound insulation cover is designed to facilitate access and maintenance of managers.
Jinan air compressor
The sound insulation cover of air compressor is an integral structure.
Design of Inlet Noise Muffler for Air Compressor
The air filter of air compressor can reduce the noise of air intake, but it can not meet the requirement of noise reduction. The noise measured at 1m of the intake filter is 96 dB (A), and the perforation rate of the blinds is 12% according to the existing conditions. Centrifugal glass wool is used for louver sound absorption data. Glass wool does not absorb water and is not affected by rainwater. Suitable for outdoor use. The noise reduction ability of louver hole is 12 dB (A).
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