Patent ID: 7311821

Claim:
A flow-multiplier water circulation assembly for a swimming pool, the assembly being of the type including a water inlet and being characterized in that it comprises: an ejector ( 110 ) connected to the water inlet and having a water outlet for projecting water along an ejection axis; a converging portion ( 114 ) having an axis of symmetry and a section perpendicular to said axis that decreases from an upstream section to a downstream section, and presenting a length between the upstream and downstream sections; a duct ( 116 , 118 , 120 ) disposed in line with the converging portion ( 114 ) to which it is connected without internal discontinuity at the downstream section of the converging portion, the duct presenting a length between the downstream section of the converging portion and an outlet, the section of the duct not decreasing in practice along its length, and the length of the duct being not less than one-third the length of the converging portion; the ejection axis practically coinciding with the axis of symmetry of the converging portion, and the two axes together forming a common axis ( 112 ) of the assembly; the distance between the water outlet of the ejector ( 110 ) and the downstream section of the converging portion ( 114 ) lying in the range 0.4 times to 1.6 times the length of the converging portion; and a guide space disposed immediately upstream from the upstream section of the converging portion ( 114 ) on the common axis ( 112 ), and at least as far as the water outlet from the ejector when the outlet is outside the converging portion, said space serving to guide water in practically symmetrical manner around the common axis.