SCROLL CASING, AND AIR-SENDING DEVICE AND AIR-CONDITIONING APPARATUS WHICH INCLUDE THE SAME

A scroll casing accommodates a cross-flow fan, thereby forming an airflow passage, and includes a scroll section having, as an upstream end, an approach point at which the scroll section most closely approaches the fan. A region between the upstream end of the scroll section and a downstream end is divided into three regions in the flow direction of airflow. In the three regions, the distance between the center of rotation of the fan and the scroll section increases at different change rates from the upstream end to the downstream end as the scroll section is viewed at a section perpendicular to an axis of rotation of the fan. Where the three regions are a first region, a second region, and a third region in this order from an upstream side in the flow direction of the airflow, the change rate of the second region is the smallest.