| 摘要 |
PROBLEM TO BE SOLVED: To improve the capacity of the thruster of a cleaning machine and to reduce the capacity and required driving power of a driving electric motor. SOLUTION: The thruster 9 for pressing a wall surface of a water channel cleaning machine having an electrically driven brush 2 for cleaning, electrically driven wheels 3 and the thruster 9 for pressing the wall surface consists of an electric motor 5 for driving rotary vanes 4 and plural swiveling removal plates 8 in a cylindrical casing 7. These swiveling removal plates 8 are fixed onto the circumference between the outer peripheral surface of the motor 5 and the inner peripheral surface of the cylindrical casing 7 and have an inlet angle α with respect to the axial direction of rotation in the inlet of the swiveling removal plates 8. The outlet angle of the rotary vanes 4 is set zero with respect to the axial direction of rotation in the outlet of the swiveling removal plates 8. The shape of the swiveling removal plates 8 between the inlet and outlet of the swiveling removal plates 8 is formed of smoothly continuing curves. The water flow ejected out of the cylindrical casing 7 is composed of only the axial direction component by removing the swiveling direction component of the flow generated by the rotary vanes 4 at the time of passing the swiveling removal plates 8. |
