Patent ID: 8235581

Claim:
A Mixing device for mixing a liquid, such as water, with an instant ingredient to form a beverage, the mixing device comprising: a mixing chamber; a rotor which, during rotation about an axis of rotation, defines a surface of revolution extending along a circumference of the rotor; wherein the rotor is arranged in the mixing chamber; wherein the mixing chamber comprises a peripheral wall zone having a substantially circular cross section, which peripheral wall zone surrounds the surface of revolution and comprises a peripheral wall part extending in the direction of the axis of rotation and a transverse wall part which is perpendicular to the axis of rotation; wherein an outlet duct for discharging a mixture formed is connected to the mixing chamber, an inlet of which is provided in the transverse wall part at the rotor; characterized in that at least one rotor rib is provided at the peripheral wall zone on either side of the inlet; and wherein the rotor rib extends from the peripheral wall zone in a direction of the surface of revolution of the rotor, the rotor rib extending along an entire axial length of the rotor.