Patent ID: 6893218

Claim:
A centrifugal blower unit for an inside and outside air double-layered flow type vehicular air conditioner, the centrifugal blower unit comprising: a centrifugal fan including: a first fan having a plurality of first blades arranged about a rotation axis for blowing air radially outward; and a second fan having a plurality of second blades arranged about the rotation axis for blowing air radially outward, wherein the second blades are offset from the first blades in a direction parallel to the rotation axis; a separation wall provided between the first blades and the second blades to restrict air flowing from the first blades toward the second blades and from the second blades toward the first blades; a scroll casing that houses the centrifugal fan and defines a spiral air passage into which air blown by the centrifugal fan flows; a divider provided in the scroll casing to restrict mixture of air blown by the first fan and air blown by the second fan; a stationary separating cylinder for separating air to be sucked into the first fan from air to be sucked into the second fan; and a driving device for rotating the centrifugal fan, wherein the first fan has an inside diameter that is larger than an inside diameter of the second fan, and wherein the first fan is arranged on one axial side of the second fan, which is opposite from the driving device.