关键词: 风管送风式空调室内机, 制冷剂流动噪声, 声品质

Abstract: The refrigerant flow noise of the indoor unit of the air duct air conditioner is a noise problem that users often complain about. At present, most of the evaluation of refrigerant flow noise in the air conditioning industry uses A-weighted sound pressure level, which cannot reflect the real acoustic experience of users. The sound quality evaluation method is used to analyze the refrigerant flow noise, and the influencing factors of the refrigerant flow noise are analyzed by combining experiments and simulations, and the sound quality grade score is increased from 5.4 points to 7.2 points, and the subjective evaluation support rate is increased from 6% to 92% by optimizing the groove structure at the outlet of the electronic expansion valve and canceling the secondary necking of the trachea.

Key words: Indoor unit of the air duct air conditioner, refrigerant flow sound, sound quality