Draft Tube Agitator Blade Curvature for Homogeneous Mixing
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Solution Overview
Problem
Existing stirring devices lack optimal fluidic properties, leading to inefficient mixing, potential dead spaces, and increased shear forces on particles and crystals, which can result in caking and incrustations.
Innovation Solution
A guide tube stirring device with a rotor blade element having a substantially circular arc-shaped outer contour, comprising a flat first region and a curved second region, is designed for efficient fluid conveying, featuring a hub element connected to a drive shaft and made from materials resistant to solvents and acids, with a casing unit that adapts to the guide tube for homogeneous flow and reduced shear forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional stirring devices are used, then mixing function is provided, but fluidic properties are suboptimal leading to dead spaces and inefficient mixing
Solution Approach 1:
The rotor blade element features a circular arc-shaped outer contour with a specific radius of curvature that is at least 20% of the blade element length. This curved geometry eliminates dead spaces and improves fluid flow patterns, ensuring complete mixing without stagnant regions while maintaining reliable fluidic properties throughout the mixing chamber.
2Productivity
If conventional stirring devices are used, then mixing is performed, but shear forces on particles and crystals are increased causing caking and incrustations
Solution Approach 1:
The stirring device incorporates a guide tube with specifically optimized geometric parameters including a diameter ratio and length-to-diameter ratio. The guide tube geometry creates controlled flow patterns that distribute shear forces uniformly throughout the fluid, preventing localized high shear zones that would cause particle caking and crystal incrustations while maintaining effective mixing.
3Reliability
If rotor blade element with circular arc-shaped contour is used, then homogeneous fluid mixing is achieved, but device complexity increases
Solution Approach 1:
The circular arc-shaped rotor blade element is defined by a single critical parameter: the radius of curvature, which is specified as at least 20% of the blade element length. This parameter-based design approach simplifies manufacturing while ensuring homogeneous mixing, as the curved geometry naturally eliminates dead spaces and promotes uniform fluid circulation without requiring complex multi-component structures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves efficient and homogeneous fluid mixing, reduces shear forces, and prevents caking and incrustations, ensuring a high level of homogeneity and product-friendly conveying.
Implementation Method 1
at least one stirring unit (12) rotatable about an axis of rotation (10), which is provided for conveying a fluid in an axial conveying direction (16)
Implementation Method 2
reduces shear forces, and prevents caking and incrustations
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Disclosed is an agitator device, in particular a draft tube agitator device, comprising at least one agitator unit (12a; 12b) that can rotate about a rotational axis (10a) and that is provided for the delivery of a fluid in an axial delivery direction (16a; 16b). The agitator unit has at least one rotor blade element (18a), a section of which that projects on a plane perpendicular to the rotational axis (10a) having an at least substantially arced outer contour (20a), and the rotor blade element (18a) has at least one first substantially planar region (24a) lying on a blade plane (22a) and a second region (26a) curving away from the blade plane (22a).