TURBOFAN AND AIR CONDITIONER

摘要

Of plural vanes (23) provided between a shroud (22) and a main plate (21), a shape on a side of a negative-pressure surface (K) in a section cut in parallel with a surface direction of the main plate (21) includes a recess portion (30) and a curved portion (35). The recess portion (30) is recessed toward a side of a positive-pressure surface (D) except for a leading edge portion (Ef), which is an inner circumferential side. The curved portion (35) is continuously provided from the recess portion (30) to a leading edge portion, and is expanded toward the negative-pressure surface side. A maximum thickness position (Q) of the curved portion (35) is set at a position in a range of 10% to 30% of a vane chord length from a front end of the leading edge portion, whereby airflow separation is inhibited to achieve an increased flow volume and noise reduction.