The invention relates to a method for controlling a flow generator (1) in a tank (20) configured for housing a liquid comprising solid matter, the flow generator (1) comprising an impeller and being located at a height (h-mixer) in the tank (20) and the tank (20) having a predetermined maximum filling height (h-max), wherein the flow generator (1) is configured to be operated at a variable operational speed (n) and the demand of operational speed (n-demand) is dependent on the present liquid level height (h-present) in the tank (20), wherein a max operational speed (n-max) of the flow generator (1) is the operational speed required when the liquid level in the tank (20) is equal to the maximum filling height (h-max), the present operational speed (n-present) being set equal to the demand of operational speed (n-demand) of the flow generator (1) that is determined using the formula:

[00001]$\left(n-\mathrm{present}\right)=\left(n-\mathrm{demand}\right)=\frac{\left(n-\max \right)}{\left[\left(h-\max \right)/\left(h-\mathrm{present}\right)\right]^a}$

at least when [(h-mixer)+X]≤(h-present)≤(h-max), wherein a≥(¼) and a<1, X=radius of the impeller of the flow generator+1, and all heights and measures are given in meter.

The invention relates to a method for controlling a flow generator (1) in a tank (20) configured for housing a liquid comprising solid matter, the flow generator (1) comprising an impeller and being located at a height (h-mixer) in the tank (20) and the tank (20) having a predetermined maximum filling height (h-max), wherein the flow generator (1) is configured to be operated at a variable operational speed (n) and the demand of operational speed (n-demand) is dependent on the present liquid level height (h-present) in the tank (20), wherein a max operational speed (n-max) of the flow generator (1) is the operational speed required when the liquid level in the tank (20) is equal to the maximum filling height (h-max), the present operational speed (n-present) being set equal to the demand of operational speed (n-demand) of the flow generator (1) that is determined using the formula:

[00001]$\left(n-\mathrm{present}\right)=\left(n-\mathrm{demand}\right)=\frac{\left(n-\max \right)}{\left[\left(h-\max \right)/\left(h-\mathrm{present}\right)\right]^a}$

at least when [(h-mixer)+X]≤(h-present)≤(h-max), wherein a≥(¼) and a<1, X=radius of the impeller of the flow generator+1, and all heights and measures are given in meter.

An impeller includes a hub and a plurality of blades. Each blade extends out from the hub. The impeller has an original diameter defined by respective tips of the plurality of blades. Each blade includes a central axis, a leading edge, a trailing edge, an original profile, and a plurality of trim profiles. The original profile has an outside portion and a trailing portion. The outside portion has an angle within a range of about 40° to about 90° from the central axis and the trailing portion having an angle within a range of about 10° to about 50° from the central axis. A first selected trim profile of the plurality of trim profiles extends along a first line parallel to the outside portion and a second line parallel to the trailing portion.

A stirring device is adapted to be used for a water storage system. The stirring device includes a tube unit and a stirring unit. The tube unit includes a rigid tube member, and a flexible tube member adapted for interconnecting the rigid tube member and an inlet of the water storage system. The stirring unit includes a center rod extending rotatably into the rigid tube member along an longitudinal direction of the rigid tube member, a support subunit positioning the center rod within the rigid tube member, a driver fan subunit mounted to the center rod and adapted to be driven by water for actuating rotation of the center rod, and a stirring member mounted co-rotatably to the center rod and adapted for stirring sediments in the water.

A stirring device is adapted to be used for a water storage system. The stirring device includes a tube unit and a stirring unit. The tube unit includes a rigid tube member, and a flexible tube member adapted for interconnecting the rigid tube member and an inlet of the water storage system. The stirring unit includes a center rod extending rotatably into the rigid tube member along an longitudinal direction of the rigid tube member, a support subunit positioning the center rod within the rigid tube member, a driver fan subunit mounted to the center rod and adapted to be driven by water for actuating rotation of the center rod, and a stirring member mounted co-rotatably to the center rod and adapted for stirring sediments in the water.

A mixing impeller (10) for mixing a sealant inside a cartridge (1) is disclosed. The mixing impeller (10) comprises a central hub (11) and at least two mixing arms (20) extending radially outward from the central hub (11). Each of the mixing arms (20) may include a leading edge (24), a trailing edge (26), and a wiping edge (28) extending circumferentially between a leading tip (25) of the leading edge (24) and a trailing edge transition (27) of the trailing edge (26). The wiping edge (28) may have an arc length defining a wiping edge (28) angle, the leading tip (25) may be circumferentially offset in a direction of rotation of the mixing impeller (10) defining a leading edge (24) angle to provide a forward swept configuration, and the wiping edge (28) angle may be greater than the leading edge (24) angle. A sealant cartridge (1) and mixing impeller (10) assembly is also disclosed.

A mixing impeller (10) for mixing a sealant inside a cartridge (1) is disclosed. The mixing impeller (10) comprises a central hub (11) and at least two mixing arms (20) extending radially outward from the central hub (11). Each of the mixing arms (20) may include a leading edge (24), a trailing edge (26), and a wiping edge (28) extending circumferentially between a leading tip (25) of the leading edge (24) and a trailing edge transition (27) of the trailing edge (26). The wiping edge (28) may have an arc length defining a wiping edge (28) angle, the leading tip (25) may be circumferentially offset in a direction of rotation of the mixing impeller (10) defining a leading edge (24) angle to provide a forward swept configuration, and the wiping edge (28) angle may be greater than the leading edge (24) angle. A sealant cartridge (1) and mixing impeller (10) assembly is also disclosed.

An apparatus and method for mixing a liquid having particulate includes a vessel for containing me liquid an axial impeller rotating about a substantially vertical axis. The impeller is adapted for submerging below the liquid surface by a distance approximately one-quarter to one-half of the height of the liquid. The impeller is oriented upwardly to produce (a) an inner, upward flow region located along the vertical axis of the vessel, (b) a transition flow region above the impeller in which liquid moves radially outwardly toward the vessel sidewall, and (c) an outer, downward flow region located along the sidewall. The impeller spins at a variable speed, such that the flow is capable of entraining solid particles having a settling velocity of up to approximately 1 foot per minute in the liquid, and the speed of the impeller is chosen to enable particles having a desired settling velocity to settle to the vessel bottom.

A mixing system includes a housing having a motor mount rotatably coupled thereto, the motor mount having a passage extending therethrough. A drive shaft is removably positioned within the passage of the motor mount. A cap includes a main body removably coupled to the motor mount and an actuator coupled to the main body so as to be pivotable between a first position and a second position with respect to the main body. The actuator producing a camming action when the actuator is pivoted such that when the actuator is in the first position, the actuator pushes the drive shaft against the motor mount so that the main body is locked to the motor mount and so that rotation of the motor mount causes rotation of the drive shaft and when the actuator is in the second position, the actuator is disengaged from the drive shaft and the cap is removable from the motor mount.

A hydrofoil impeller wherein the tip edge is straight and has a right angle with a radius extending from the central axis to the tip edge. In the central hub and in each of the blades the number of holes in each group of first and second holes is at least five. The pattern in which the holes are arranged in each of the respective groups of holes is elliptical having a center and a major axis which is substantially parallel to the radius and placed at a distance therefrom. The leading edge is, in the direction to rotation, behind an imaginary radial line intersecting the central axis of the shaft and the center of the ellipse, said leading edge being at an angle of 58°±2° in relation to the radial line. The area of the blade is divided into four planar portions by three straight bends.