Segmented Helical Stirrer for Large Reactor Handling
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Solution Overview
Problem
Helical stirrers used in large reactors for polymer production face high mechanical strength requirements, leading to complex geometry and high manufacturing and handling challenges due to their weight and one-piece construction.
Innovation Solution
A helical stirrer with a base body having an oval or circle-shaped outer contour, allowing for increased torsional rigidity and reduced material usage, featuring a rotatable design with windings around a rotation axis and a separate stirring blade for improved flexibility and reduced weight, enabling efficient material utilization and simplified handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the helical stirrer is made as a one-piece construction to meet high mechanical strength requirements, then the mechanical strength is improved, but the handling and transport become difficult due to huge weight
Solution Approach 1:
The helical stirrer is divided into multiple segments that can be assembled together to form the complete one-piece construction. This segmentation allows the individual segments to be manufactured, handled, and transported separately with reduced weight, while the assembled structure provides the required mechanical strength for large reactor applications
2Strength
If the helical stirrer has a special geometry adapted to large reactors, then the mechanical strength is improved, but the manufacturing effort and cost increase
Solution Approach 1:
The special geometry required for large reactor applications is achieved through segmented construction, where each segment can be manufactured using standard processes and then assembled. This avoids the need for complex one-piece manufacturing while maintaining the required geometric adaptations for large-scale operations
Solution Approach 2:
The helical stirrer segments are designed to nest together in a standardized assembly pattern, allowing the complex overall geometry to be built from simpler, standardized component segments. This nesting approach simplifies manufacturing of individual parts while achieving the required complex overall structure
3Strength
If the helical stirrer is made as a one-piece construction, then the mechanical strength is improved, but the weight increases leading to higher material input
Solution Approach 1:
The one-piece construction is achieved through assembly of segments, allowing optimization of material distribution in each segment. This enables reduced material input and weight compared to a true monolithic structure, while still providing the required mechanical strength through the assembled configuration
Data Source
AI summary
A stirring element device, in particular for stirring fluidized beds and/or solid matter mixtures and/or highly viscous suspensions, comprises at least one helical stirrer, which is rotatable around a rotation axis and has at least one winding that runs around the rotation axis, wherein the helical stirrer comprises a base body, which has in at least one cross-sectional view an at least section-wise oval, in particular circle-shaped, outer contour.