Abstract: Based on the design requirement of increasing air volume and reducing noise of outdoor unit of air conditioner, the influence of axial matching size between axial flow blade and guide ring of outdoor unit of air conditioner was studied. The results show that with the increase of the distance of the blade extending into the guide ring, the air volume first increases and then decreases, with an increase of about 16m³/h. the fan power gradually decreases, but finally tends to be stable, and the fan noise gradually increases. The results show that when the blade extends into the guide ring by 70%, the increase of air volume reaches the highest. According to the research results, the air conditioning products can be further optimized to improve the competitiveness of the products.

Key words: Air conditioner, The outdoor unit, Guide ring, Axial flow blade, Air volume