Propeller fan

摘要

According to Figure 3 of the attached drawing set, the development of the propeller fan is proposed as is described in the Main Application P 3734624.5-22. In this case, the main feature is the reduction in the noise emission. The measures required for this purpose at the same time allow improvements in the thrust to power ratio and the behaviour at altitude. For this purpose, the rotors I and II (which contrarotate and are connected to the rows of blades) as well as both the front and rear power turbines Tf and Th are provided with selectable, different rotation speeds and/or power consumptions in that, on the gas exhaust side, the turbine disc 1 of the rotor I is used as an epicyclic gear support on which the planet wheels 6 are fitted on the right, which are connected in a rotationally fixed manner, via the planet shafts 5, to the planet wheels 7 on the left hand side which, for their part, engage with the toothed rim 12 on the turbine disc 7 of the rotor II. As a result of the supporting anchor 9, which is firmly connected to the fan stator 27 and operates as a sun wheel and on whose toothed rim 10 the described planet system rolls, the two rotors rotate in opposite directions. The differences between the rotation speeds of the rotors are in this case governed by the different diameters DL and DR. These measures allow both rotors to be connected to a single row of blades, and the use of otherwise contrarotating blades by braking as a guide apparatus, as a result of which, for any flight attitude, the ... Original abstract incomplete. <IMAGE>