An apparatus for treating fluids having improved aeration efficiency and operational durability has an aerator, an impeller, and a liquid reservoir containing liquid to be treated. The aerator has: a motor rotating the impeller at a blade tip speed less than 1,100 inches/second; an air line having an outlet submerged in the liquid and an inlet adjacent to the motor; and a blower. The blower forces air through the air line to the air line outlet. The impeller two blades extending radially from the hub. Each blade has: a low drag, pressure equalized foil shape absent of rake; a leading edge extending from the hub tangentially; a 0.47-0.55 impeller EAR; 0.59-0.87 Pmean/D; progressive pitch distribution based on radius where from 50% R and out is constant and from 50% R to the hub is reduced; and 60-75 degree skew with a linear distribution from 50% radius to blade tip.

A stirrer device, especially for the mixing of a fluid with at least one other fluid, includes at least one fluid dispersing unit able to turn about an axis of rotation, having at least one exit opening for at least one fluid discharge, and the stirrer device has at least one optimization unit, which in at least one operating state increases at least a differential pressure at the exit opening.

A vane for an impeller of an agitator includes a socket having a base plane configured to mount the vane to an impeller, and a blade configured to mix a process fluid, the blade having a leading edge, a trailing edge, and a blade tip extending from the leading edge to the trailing edge at an end of the blade facing away from the socket, the blade having a pressure side and a suction side, and the pressure side having a first concave region towards the leading edge, a second concave region toward the trailing edge and a convex region between the first and second concave regions.

An impeller blade formed of a central base portion having a center axis. At least a pair of impeller blades is extended outwardly from the central base portion, with each impeller blade further including an extension. A leading edge is formed on each of the impeller blades, with each leading edge being defined by an outer periphery of the central base portion, and each leading edge having at least a portion that forms a continuous curve with a radius decreasing outwardly toward a radial tip of the corresponding impeller blade, wherein the continuous decreasing radius curve of each leading edge is formed by a portion of an ellipse centered on the center axis, a short axis of the ellipse being equal to a long axis thereof divided by approximately three and one-half. Each blade extension is projected from the corresponding impeller blade opposite of the leading edge.

A vane for an impeller of an agitator for mixing or agitating a process fluid includes a socket for mounting the vane to an impeller and a blade for mixing or agitating the process fluid, the blade being connected to the socket, the blade having a leading edge, a trailing edge, and a blade tip extending from the leading edge to the trailing edge at the end of the blade facing away from the socket, and the blade having a height and a width. The height is the maximum distance of the blade tip from the socket and the width is the distance of the leading edge from the trailing edge. The blade has a maximum width that is at least 55 percent.

The invention relates to a rotary shaft for processing foodstuffs, the rotary shaft has a rotation axis and the rotary shaft comprises at least one tool which extends along the rotation axis. The tool has an airfoil profile such that the tool comprises a leading edge, a trailing edge, an upper surface and a lower surface. Further, the tool comprises at least one fluid channel between the mean camber line of the airfoil profile and the upper surface of the tool.

An industrial mixing machine comprises a mixing head and at least one attachment means for attaching a mixing container, which contains a material to be mixed and is open on the attachment side, to the mixing head to form a closed mixing receptacle. The mixing head is pivotably mounted in relation to a frame as part of a pivotable assembly in such a way that the closed mixing receptacle formed from mixing head and mixing container is pivotable in relation to the frame to carry out the mixing process. The mixing head has at least one mixing tool, which is seated on a drive shaft extending through the mixing head and rotationally driven thereby, having multiple radial blades. The radial blades have a cross-sectional geometry according to which, starting from its maximum thickness, the blade thickness decreases in the rotational direction toward the rear blade end. In the section of decreasing blade thickness, the blade lower side is pitched more strongly with respect to the horizontal in the rotational direction than the blade upper side. An imaginary straight line connecting the rear end of the radial blades to their respective front end facing in the rotational direction is inclined in relation to the horizontal in the same direction as the inclination of the blade lower side in the section of decreasing thickness.

An agitator device, in particular a draft tube agitator device, with at least one stirring unit, which is rotatable around a rotary axis, which is configured for conveying a fluid in an axial conveying direction and which includes at least one rotor blade element, the projection of said rotor blade element onto a plane that is perpendicular to the rotary axis having an at least substantially circular-arc-shaped outer contour, the rotor blade element comprises at least one first region, which is situated in a blade plane and is at least substantially planar, and includes a second region, which is curved out of the blade plane.

A vane for an impeller of an agitator includes a socket having a base plane configured to mount the vane to an impeller, and a blade configured to mix a process fluid, the blade having a leading edge, a trailing edge, and a blade tip extending from the leading edge to the trailing edge at an end of the blade facing away from the socket, the blade having a pressure side and a suction side, and the pressure side having a first concave region towards the leading edge, a second concave region toward the trailing edge and a convex region between the first and second concave regions.

A vane for an impeller of an agitator for mixing or agitating a process fluid includes a socket for mounting the vane to an impeller and a blade for mixing or agitating the process fluid, the blade being connected to the socket, the blade having a leading edge, a trailing edge, and a blade tip extending from the leading edge to the trailing edge at the end of the blade facing away from the socket, and the blade having a height and a width. The height is the maximum distance of the blade tip from the socket and the width is the distance of the leading edge from the trailing edge. The blade has a maximum width that is at least 55 percent.