| 摘要 |
PCT No. PCT/SE85/00186 Sec. 371 Date Jul. 25, 1986 Sec. 102(e) Date Jul. 25, 1986 PCT Filed Apr. 24, 1985 PCT Pub. No. WO85/05295 PCT Pub. Date Dec. 5, 1985.A movable hydrodynamic nozzle which removes deposits of sand, soil, sludges etc. in a pipe system. The nozzle is connected to a pressurized water pipe and pulls the pressurized water pipe into the pipe system. When known movable hydrodynamic nozzles are used, the cleaning efficiency is lower due to strong turbulence and frothing and to the fact that the resistance of the nozzle to the water flow is large. In accordance with the present invention this problem is solved by shaping the channels which guide the pressurized water from the main inlet portion of the nozzle to the outer back portion of the nozzle, in such a way that the pressurized water is entering the channels in the same direction as it has when it enters the main inlet portion. Additionally, the inlet openings and outlet openings of every channel are preferably diametrically opposed in order to give the channel an optimally large curve radius. |
