Wedge-Shaped Shear Blades for Powder-Liquid Mixing
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Solution Overview
Problem
Existing mixers for powder and liquid fail to achieve efficient mixing behavior and are prone to disruptive deposits and adherent accumulations due to suboptimal shear blade design.
Innovation Solution
The rotor features wedge-shaped shear blades with acute-angle planar side walls converging towards a central shaft receptacle, inclined to position their sharp face edges forward in the flow direction, reducing rear-side deposits and enhancing mixing efficiency by creating a pronounced shear region and laminar flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional shear blades are used, then mixing action is provided, but disruptive deposits and adherent accumulations occur
Solution Approach 1:
The shear blades are designed with asymmetric wedge-shaped geometry where the two planar side walls are aligned at an acute angle to one another and converge in the direction of the shaft receptacle. The blades are inclined away from the shaft receptacle so that the face sides are forward in the flow direction, creating asymmetric flow patterns that prevent deposit formation while maintaining effective mixing action.
Solution Approach 2:
The wedge-shaped shear blades create a pronounced shear region at the sharp face edge for effective mixing, while the rear side wall is specifically designed to avoid or reduce flows that would cause deposits. This local differentiation of flow characteristics addresses different requirements at different locations on the blade surface.
2Productivity
If shear blades are designed to generate high shear forces, then mixing efficiency is improved, but deposit formation increases
Solution Approach 1:
The asymmetric wedge-shaped design with acute-angle side walls converging toward the shaft receptacle creates different flow conditions on the face side versus the rear side. The face side generates high shear forces for efficient mixing, while the rear side geometry directs flows away from the surface to prevent deposits.
Solution Approach 2:
The blade geometry provides locally optimized flow characteristics: the sharp face edge creates intense shear for mixing efficiency, while the rear side wall configuration creates laminar flow patterns that minimize deposit formation. Each region of the blade is designed to address specific local requirements.
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
This design achieves efficient mixing while minimizing deposits and accumulations, ensuring trouble-free operation and effective powder and liquid diversion, resulting in improved mixing performance.
Implementation Method 1
The shear blades are used to generate high shear forces to promote mixing
Implementation Method 2
when the rotor is operated as intended, the face sides of these shear blades are forward in the flow direction
Data Source
AI summary
In the case of a rotor (109) for a device for mixing powder and liquid, which device has a stator which interacts with the rotor (109), at least some shear blades (124) are of wedge-shaped form and are inclined with one face side (233) in a flow direction (239). This has the result, in the case of an effective diversion at side walls (227) situated at the front in a flow direction (239), of an intense shear action at the face sides (233) and of a relatively low risk of formation of deposits and adherent accumulations on the side walls (230) situated at the rear in the flow direction (239).