Centrifugal blower

A centrifugal blower comprising:

• a centrifugal fan including
• a plurality of first blades arranged about a fan central axis,
• a plurality of second blades arranged about the fan central axis, the plurality of second blades being located on a first side of the plurality of first blades in an axial direction of the fan central axis and being aligned to the plurality of first blades,
• a separation panel located between the plurality of first blades and the plurality of second blades, and
• an inward extending part extending inward in a radial direction of the centrifugal fan from the separation panel;
• and
• a partition cylinder portion having a cylindrical shape extending in the axial direction, a diameter of the partition cylinder portion expanding in the axial direction toward a second side that is an opposite side of the first side, the partition cylinder portion being located inside the plurality of second blades in the radial direction, wherein
• the centrifugal fan is configured to rotate about the fan central axis to
• take in air from the first side into spaces between the plurality of first blades and spaces between the plurality of second blades,
• blow out the air in the spaces between the plurality of first blades outward in the radial direction, and
• blow out the air in the spaces between the plurality of second blades outward in the radial direction,
• the partition cylinder portion partitions, on an airflow upstream side of the plurality of first blades and the plurality of second blades, the air taken into the spaces between the plurality of first blades through an inside of the partition cylinder portion in the radial direction from the air taken into the spaces between the plurality of second blades through an outside of the partition cylinder portion in the radial direction,
• the separation panel has a plate shape extending in the radial direction and partitions the air flowing through the spaces between the plurality of first blades from the air flowing through the spaces between the plurality of second blades, and
• the inward extending part is located inside, in the radial direction, both connected ends of the plurality of first blades each of which is joined to the separation panel and connected ends of the plurality of second blades each of which is joined to the separation panel.