Axial Flow Impeller Blade Geometry for Low Power Consumption
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Solution Overview
Problem
Existing axial flow impellers face challenges in achieving high pumping capacity with low energy consumption and efficiency, particularly in metallurgical applications where energy dissipation zones can damage carbon used for gold processing, necessitating an improvement in performance characteristics, power consumption, and operational costs.
Innovation Solution
The design of a blade for an axial flow impeller featuring a specific contour defined by tapering cut-outs and angled profile portions, optimized for low power consumption and high pumping efficiency, with scaling rules for easy fabrication and adaptation, including chamfered or thinned edges and multiple blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional axial flow impeller blade designs are used, then the impeller can provide basic mixing function, but the energy consumption is high and pumping efficiency is insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the blade geometry parameters including the envelope rectangle dimensions, cut-out sizes and positions, bend angles (first angle, second angle, third angle), and profile portion configurations. These parameter optimizations enable the blade to achieve higher pumping capacity and efficiency while consuming less power, directly resolving the contradiction between energy consumption and productivity
Solution Approach 2:
The patent introduces a comprehensive geometric model that considers multiple dimensional parameters simultaneously - the envelope rectangle in plan view, the profile portions in side view, and their spatial relationships. This multi-dimensional approach allows optimization of power consumption and pumping capacity by coordinating changes across different geometric dimensions rather than adjusting single parameters in isolation
2Productivity
If conventional axial flow impeller blade designs are used, then the impeller can operate continuously, but the pumping efficiency and mass flow rate per unit energy are insufficient
Solution Approach 1:
The patent optimizes pumping efficiency by carefully selecting geometric parameters including the envelope rectangle aspect ratio, cut-out dimensions (lengthwise and widthwise catheti), and bend angles. These parameter changes create an optimized flow path that reduces energy losses and improves the mass flow rate per unit energy consumed
Solution Approach 2:
The patent incorporates curved elements through the angled profile portions and bend configurations that smoothly guide fluid flow. The first profile portion angled downwardly at a first angle, the second profile portion at a third angle, and the third profile portion angled downwardly at a second angle create smooth transitions that reduce turbulence and energy dissipation, thereby improving pumping efficiency
3Reliability
If conventional axial flow impeller designs are used, then the impeller can provide mixing function, but high energy dissipation zones are created that can damage carbon used for gold collection
Solution Approach 1:
The patent reduces energy dissipation by optimizing geometric parameters including the envelope rectangle dimensions, cut-out configurations, and bend angles. These parameter optimizations create a more uniform flow distribution that eliminates high-energy dissipation zones, protecting the carbon used for gold collection while maintaining reliable operation
Solution Approach 2:
The patent applies local quality by creating different flow characteristics in different regions of the blade through the envelope rectangle with cut-outs at specific corners and angled profile portions. This localized geometric variation ensures that high-energy dissipation zones are eliminated in critical areas where carbon is present, while maintaining effective mixing in other regions
4Productivity
If complex blade shapes are used to improve performance, then pumping capacity and efficiency increase, but manufacturing complexity and fabrication difficulty increase
Solution Approach 1:
The patent divides the blade geometry into distinct segments: an envelope rectangle, corner cut-outs, and angled profile portions. This segmentation allows each component to be defined by simple geometric parameters that are easy to manufacture, while the combination of segments creates the optimized performance characteristics
Solution Approach 2:
The patent maintains ease of manufacture by defining the complex blade shape through a set of controllable geometric parameters (envelope rectangle dimensions, cut-out sizes and positions, bend angles) rather than requiring complex free-form surfaces. This parametric approach enables standard fabrication methods to produce high-performance blades
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 optimized blade shape results in low power consumption, high pumping capacity, and efficient mass flow rate per unit of energy, with improved mixing performance and reduced shear, making it suitable for metallurgical applications with enhanced operational efficiency and cost-effectiveness.
Implementation Method 1
the first profile portion is angled at a first angle downwardly from the second profile portion... the third profile portion is angled at a second angle downwardly from the second profile portion
Data Source
AI summary
The invention relates to a blade (4) of an axial flow impeller (1). Dimensioning rules for the blade (4) are presented: A = 0,2R; B = 0,2Wb; C = 0,2R; D = 0,2Wb;E = 0,5R; F = (0,1...0,2)R; G = 0,2Wb; H = 0,25R; I = 0,1R; J = 0,4R; K = 0,1Wb. The first angle alpha = 6º ± 1º, the second angle alpha2 = 8º ± 1º and the third angle alpha 3 = 19º to 25º. R is the lengthwise dimension from the axis of rotation (x) of the impeller to the tip (7) of the blade (4). Width Wb is the widthwise dimension of the blade perpendicularly to the lengthwise direction. The invention also relates to an axial flow impeller (1) having said blades (4).