| 摘要 |
<p>A mobile device for cleaning a vertical duct (9) in a building (12) comprises a tank (3) for cleaning liquid, a unit (4) for pressurising the cleaning liquid, a feeder hose for supplying the pressurised cleaning liquid to the vertical duct, a riser hose connected to the feeder hose and adapted to conduct the cleaning liquid upwards in the duct, and a spray nozzle (8) mounted at the end of the riser hose and having a number of circumferentially distributed holes for discharging the pressurised cleaning liquid in such a manner that the spray nozzle and the riser hose propelled upwards in the duct while at the same time cleaning the duct wall. The pressurising unit (4) generates a pressure of 110-320 bar. At least a first number of the holes are adapted to discharge the cleaning liquid to propel the spray nozzle upwards in the duct, these holes having an angle of aperture of 45° or less to the discharge direction of the spray nozzle. Furthermore, at least a second number of the holes are adapted to discharge the cleaning liquid to clean the duct wall, these holes having an angle of aperture of 90° or less to the discharge direction. The inner diamter of the riser hose is between 7 and 10 mm.</p> |
