Vacuum cleaning tool with direct flow turbine

A vacuum cleaning tool for a vacuum cleaning device, the vacuum cleaning tool comprising:

• a housing (4) having a partition (13) dividing an interior of the housing (4) into a brush chamber (5) and a turbine chamber (6), wherein the brush chamber (5) has a bottom (8) and vacuum slot (9) arranged in the bottom (8), and wherein the partition (13) has an intake window (14);
• a vacuum connector (23) connected to the housing (4) remote from the brush chamber (5), wherein the vacuum connector (23) has an outlet window (24);
• a working roller (11) arranged in the brush chamber (5) perpendicularly to a working direction (7) of the vacuum cleaning tool and having a peripheral portion (10) projecting from the brush chamber (5) through the vacuum slot (9) to the exterior of the housing (4);
• an air turbine (15) arranged in the turbine chamber (6) and configured to drive in rotation the working roller (5);
• wherein the air turbine (15) has vanes (20) arranged in an annular vane arrangement (21) with a vane-free center (50), wherein between the vanes (20) free flow paths (22) are provided extending toward the vane-free center (50);
• wherein a vacuum air flow (19) enters the brush chamber (5) via the suction slot (9), flows from the brush chamber (5) through the intake window (14) into the turbine chamber (6), flows within the turbine chamber (6) from the intake window (14) to the outlet window (24) through the vane-free center (50), and exits from the turbine chamber (6) through the outlet window (24);
• wherein in a flow direction of the vacuum air flow (19) the outlet window (24) is higher than the intake window (14);
• wherein the annular vane arrangement comprises 10-14 vanes (20);
• wherein an imaginary connecting line between a central area of the intake window (14) and a central area of the outlet window (24) intersects the air turbine (15) as a secant (41) to define a circle segment (43, 44) with a circular arc (42), and wherein along the circular arc (42) four to six of the vanes (20) of the annular vane arrangement (21) are arranged;
• wherein the air turbine (15) has a mantle surface (47) and wherein the turbine chamber (6) has a chamber bottom (28), wherein the mantle surface (47) of the air turbine (15) is positioned at a spacing (a) to the chamber bottom (28);
• wherein the intake window (14) has a lower edge (36) and an upper edge (26), wherein the lower edge (36) is positioned at the level of the chamber bottom (28).