Liquid circulating device for diffusion of e.g. air, in liquid of basin, has propeller coaxial to shaft and canalizing gas in shaft from top to bottom, and blades diffusing gas towards liquid that is admitted via passage located in liquid

摘要

The device (1) has a hollow cylindrical diffusing shaft (3) rotatably driven by a motor (4) and arranged co-axial to a rigid cylindrical structure (2). The shaft has an upper end opened for receiving a gas (36) to be diffused, and a lower part carrying hollow blades to diffuse the gas from the shaft towards a liquid (5). The liquid is admitted via a liquid intake passage (13) located in the liquid. A propeller (29) having vanes (29a, 29b) is arranged on the upper end of the shaft. The propeller is coaxial and integrated to the shaft, and canalizes the gas in the shaft from top to bottom.