Patent ID: 6481885
Filing Date: 2002-11-19
Classification: B05B,B08B

Abstract:
A hydrodynamic stirring device which dissolves, mixes or puts back into suspension or into a â€œsolâ€  in a primary liquid phase, a deposited sediment which is contained in a tank and covered by said primary liquid phase comprising:suction means including at least one pump to remove liquid from said primary liquid phase in said tank; and injection means connected to a discharge side of the suction means and equipped for reinjecting said liquid into said tank, towards said deposited sediment, in the form of at least one jet having a predefined pressure and flow rate, said injection means comprising at least one tube which bears at an end portion thereof, a self-rotating lance, said lance including a hollow cylindrical stator having open end portions and which is connected through a first of said end portions to said tube and wherein a nozzle bearing rotor is rotatably mounted at a second of said end portions of said stator, and said rotor bearing, at its periphery, at least two nozzles, each having a radial direction component, at least one of said nozzles having an orifice directed to have a tangential direction component with respect to the nozzle bearing rotor, wherein the nozzles are arranged such that force directed along the radial components is canceled out; and wherein said stator and said rotor define a chamber therebetween, said chamber being in fluid communication with said primary liquid phase via at least one annular slit defined by said rotor.