Pulser for ventilating, heating and/or air conditioning appliance of motor vehicle, has deflector ring with air gap whose thickness is such that leaks by air recirculation from high pressure zone towards low pressure zone, are null

摘要

The pulser (10) has high pressure and low pressure air zones defined inside and outside of a volute (14), respectively. A deflector ring (22) has an air gap (25) arranged between a convex inner region (22a) and a concave edge (16b) of a blade (16) of a centrifugal turbine (12). Thickness of the air gap is less than 3 mm so that leaks by air recirculation from the high pressure zone (10b) towards the low pressure zone are null. An independent claim is also included for a ventilating, heating and/or air conditioning appliance for the cab interior of a motor vehicle, having a pulser.