Centrifugal blower

An air conditioning system of a motor vehicle, comprising a centrifugal blower having:

• a centrifugal fan with an electric motor, which drives a fan wheel in rotation,
• a motor bracket for the electric motor, which receives the centrifugal fan internally and has a collar extending outward in a radial direction, and
• an encircling water protection ring arranged internally on the motor bracket and extending upward in an axial direction,
• wherein the motor bracket is configured as a hollow part with an interior annular water collection channel arranged beneath the collar, the water collection channel having a floor which is tilted downward in a radially outward direction,
• wherein at least one opening is disposed at a transition from the collar to the water protection ring, by which water is able to drain into the water collection channel arranged underneath,
• wherein the water collection channel has at least one drain, and
• wherein the at least one opening is configured as a ring segment slot, which extends circumferentially along the transition from the collar to the water protection ring for a distance greater than a height of the ring segment slot.

A motor vehicle comprising an air conditioning system including a centrifugal blower having:

• a centrifugal fan with an electric motor, which drives a fan wheel in rotation,
• a motor bracket for the electric motor, which receives the centrifugal fan internally and has a collar extending outward in a radial direction, and
• an encircling water protection ring arranged internally on the motor bracket and extending upward in an axial direction,
• wherein the motor bracket is configured as a hollow part with an interior annular water collection channel arranged beneath the collar, the water collection channel having a floor which is tilted downward in a radially outward direction,
• wherein at least one opening is disposed at a transition from the collar to the water protection ring, by which water is able to drain into the water collection channel arranged underneath,
• wherein the water collection channel has at least one drain, and
• wherein the collar at least partially covers the water collection channel.