The study of the noise source of air conditioner noise is to study the response of the cabin caused by the vibration input generated by the air conditioner. In this example, the outdoor unit has the loudest noise loudness compared to the indoor unit, and the resonance sound is larger than that of the indoor unit. Therefore, this paper mainly discusses how to reduce the noise of the outdoor unit in the sound source and propagation path. The basic principle for reducing the sound of outdoor units is to minimize the excitation force and reduce the response of the noise radiating components in the mechanical system to the exciting force. Sound source control Noise noise is classified into aerodynamic noise (ie, airborne sound) and noise generated by vibration of mechanical components (ie, solid sound). Fan motor bearing, mechanical imbalance (unbalance of motor rotor and fan blade) and improper installation of fan mounting bracket; the vibration generated by the compressor body makes the compressor parts resonate, forming resonance sound and compressor motor driving noise. To reduce the air sound from the fan, the following measures can be taken: the size of the air volume noise is related to the windward area of ​​the blade, and the small fan blade can obtain the effect of large air volume and low noise. In addition, the number of blades increases, the wind pressure increases, and the noise is also large. Generally, 3 to 4 blades are used as the blades; blades with high balance accuracy are selected; and the input power of the motor is minimized under the premise of satisfying the air volume. To reduce the solid sound from the fan, the following measures can be taken: the low noise fan motor is selected; and the structural dynamic stiffness of the fan bracket is improved. The sound of the air generated by the compressor can be: rationally arrange the pipe connected to the compressor, add a noise-absorbing joint in the pipeline; paste the sound-absorbing material in the pipeline. Ceramic And Alumina Ball ,Alumina Ball,Alumina Grinding Ball,Alumina Ceramic Ball Ningbo Cijie Chemical Equipment Co., Ltd. , https://www.shengjie-tower.com