| 摘要 |
<p>A dosing device (2) for a high-pressure cleaner with a single pump piston driven by internal combustion engine, and with a connecting part (8) being adapted to be connected with a discharge connection of the high-pressure cleaner, a connecting part (18) being adapted to be connected with a jet pipe with a spray nozzle, a - between the connecting parts - stretching channel (6) connected with a dosing pump (42) with a suction tube (72) projecting into a supply bottle (16) for an additive to be mixed with the liquid stream from the high-pressure cleaner, the dosing pump (42) is adapted to be driven by the action of the pulsating pressure of the liquid stream from the high-pressure cleaner, as the dosing pump (2) as known per se comprises a pump chamber (52) with a spring activated pump piston (56) with a central axial pump channel (62), which on the delivery side cooperate with a ball valve (64), being adapted to close the pump channel (62), when the pump piston (56) is moved from the supply bottle (16), as the pump chamber (52) comprises another ball valve (68) being adapted to close a suction channel (66) to the suction tube (72), when the pump piston (56) is moved towards the supply bottle (16), respectively.</p> |
