Adding system for fire-extinguishing units

An adding system, comprising:

• a motor able to be driven by a flow of an extinguishing agent, with an input for supplying the extinguishing agent to the motor, an output for discharging the extinguishing agent from the motor, and an output shaft able to be driven by the motor;
• an adding pump for conveying an extinguishing agent additive which has an input shaft coupled to the output shaft of the motor, an inlet for providing the extinguishing agent additive, and an outlet for discharging the extinguishing agent additive;
• an adding line having a first motor-side end and a second outlet-side end, wherein the first motor-side end is fluidly connected to the output of the motor;
• and
• an extinguishing agent additive line having a first pump-side end and a second adding line-side end, wherein the first pump-side end is fluidly connected to the outlet of the adding pump and the second adding line-side end is fluidly connected to the adding line at an admixture point,
• wherein the motor is a rotation motor in which a rotor is rotatably mounted in a drainage housing such that the rotor at least temporarily comes into contact with an inner side of the drainage housing, which forms an outer wall of a working chamber of the motor during its rotation,
• wherein the outer wall of the working chamber is at least partially in the shape of a logarithmic spiral in a cross section perpendicular to an axis of rotation of the rotor,
• wherein the rotor comprises a plurality of vane-shaped paddles inserted into radial slots in a rotor body of the rotor such that both ends of each paddle nearly touch the outer wall of the working chamber.