Abstract: Based on design requirements for noise reduction of air-conditioning outdoor unit, this paper studies the influence factors of the structure of the front panel guide wind ring on air volume and noise of outdoor unit, which includes the height, length and segmental arc structure of the wind guide ring. The result shows that, within the permissible range of the size space of air-conditioning outdoor unit, the air volume increased with the increase of the guide wind circle length, when the guide ring length increased from a to c, the air volume increases by 35~100m³/s, while the noise can be decreased by 0.5dB~1dB under the same air volume change. With the arc of the guide wind ring increasing, the air volume increases firstly and then decreases. When the arc section increases from r to R, the air volume increases by 30~140m³/s. when the arc section increases from R to RR, the air volume decreases by 30~80m³/s, the noise decreases 0.5~1dB firstly, then increase by about 0.5dB under the same air volume change. Which shows that , the air volume and noise of the outdoor unit achieve the best effect when the arc segment is R. The air volume increases with the increase of the guide wind circle height, when the wind circle height increases from h to H, the air volume rises by 50m³/s, while the noise decreases slightly by 0.3dB~0.5dB under the same air volume change. The study on the influence of guide wind ring structure on air volume and noise of air-conditioning outdoor unit shows that, the increasing of the guide wind ring height and length has a positive effect on improving the air volume and noise reduction of the outdoor unit. However, this positive effect is limited by the front panel metal material and processing technology.

Key words: Air conditioner outdoor unit, Air ducting, Air volume, Noise