Mixing unit for use in a mixing apparatus and a mixing apparatus

A mixing unit (10) for use in a mixing apparatus (100) for mixing treatment media in liquid or gaseous state into a fiber suspension, which apparatus comprises a housing (101) defining a mixing chamber (102), a first inlet (103) for feeding a fiber suspension to the mixing chamber, a second inlet (104) for feeding treatment media into the mixing chamber, a drive shaft (105) connected to a drive device (106) for rotation of the drive shaft (105) in operation, and an outlet (107) for discharging the mixture of fiber suspension and treatment media,

• said unit (10) for mixing being adapted to be installed in the mixing apparatus and comprising
• a rotor (11) comprising a rotor shaft (11a) being adapted to be connected to the drive shaft (105) for, in operation, simultaneous rotation with the drive shaft,
• at least two rotor bodies (11b, 11c) arranged on the rotor shaft (11a), each having a radial extension, the bodies being arranged to be axially separated from each other along the rotor shaft (11a),
• at least one stator body (13a) arranged to be placed, seen in the axial direction of the rotor shaft axis, between the rotor bodies (11b, 11c),
• the rotor and stator bodies being adapted to interact to produce a turbulent zone in between them so as to form multiple mixing zones (108) within the mixing chamber (102),
• wherein the respective configuration of the rotor and stator bodies (11b,11c,13a) in their radial extension are adapted to enable insertion and/or removal of a rotor or stator body (11b, 11c, 13a) by the respective bodies being adapted to be able to pass each other.