Centrifugal fan and air conditioner indoor unit

The utility model discloses a centrifugal fan and an air conditioner indoor unit, and relates to the technical field of fans, the centrifugal fan comprises a volute, an impeller and an extension section, and the volute is provided with an air outlet; the impeller is mounted in the volute; the extension section is connected to the volute, surrounds at least part of the side wall of the air outlet and extends in the air outlet direction of the air outlet. According to the centrifugal fan, the extension section is arranged, so that the jet flow noise generated by over-high air flow velocity at the air outlet is reduced, and the mute performance of the centrifugal fan during operation is improved. 本实用新型公开了一种离心风机及空调室内机，涉及风机技术领域，其中离心风机包括蜗壳、叶轮和延长段，蜗壳设有出风口；叶轮安装于蜗壳内；延长段连接于蜗壳，延长段围绕出风口的至少部分侧壁设置，并沿出风口的出风方向延伸。本实用新型通过设置延长段，降低了出风口气流流速过高而产生的射流噪音，提升了离心风机运行时的静音性能。