Adjustable Hydrodynamic Converter for Wide Speed Ratio Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hydrodynamic converters are limited by a narrow speed ratio and working range, particularly in high-speed applications, which restricts their efficiency and adaptability in industrial and rail vehicle transmissions.
Innovation Solution
A hydrodynamic converter design featuring a working chamber with multiple guide wheels, including an adjustable guide wheel, where the working medium flows centrifugally through the pump wheel and centripetally through the turbine wheel, allowing for a high-speed ratio and wide working range, with adjustable guide vanes to optimize power transmission and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional hydrodynamic converters are designed with fixed guide wheels and standard blade configurations, then the structure is simple and manufacturing is easier, but the speed ratio is limited and the working range is narrow
Solution Approach 1:
The guide wheel blades are made adjustable during operation, allowing the converter to dynamically adapt to different operating conditions. This enables continuous change of power consumption and power transfer characteristics, expanding the speed ratio range from the conventional limited range to 1.3-2.5 while maintaining structural feasibility
Solution Approach 2:
The converter incorporates multiple guide wheels (at least two guide wheels arranged in sequence), dividing the flow control function into separate stages. This segmentation allows independent optimization of each guide wheel's blade configuration, enabling broader speed ratio coverage without proportionally increasing overall complexity
2Adaptability or versatility
If multiple guide wheels are added to expand the working range, then adaptability improves, but device complexity increases
Solution Approach 1:
Each guide wheel is designed to perform multiple functions: flow direction control, speed ratio adjustment, and efficiency optimization across different operating points. The adjustable blades in each guide wheel allow a single component to serve multiple operational regimes, reducing the need for additional specialized components
3Power
If the converter is designed for high torque transmission with limited speed ratio, then torque capacity is improved, but efficiency at high speed ratios deteriorates
Solution Approach 1:
The blade angles of the guide wheels are made variable during operation, allowing continuous adjustment of flow parameters. This enables the converter to maintain optimal efficiency across a broad speed ratio range (1.3-2.5) while preserving high torque transmission capability, rather than being optimized for a single design point
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 a high-speed ratio of 1.8 to 2.0 and a working range of up to 2.3, with peak efficiencies above 80% and reduced power consumption, ensuring efficient power transmission and adaptability across varying speed ratios.
Implementation Method 1
the working medium of the circulatory flow in the working chamber flows at least partially, centrifugally through the pump wheel
Implementation Method 2
the outflow direction of the working medium of the circulatory flow out of the turbine wheel progresses partially centripetally and partially in the axial direction
Implementation Method 3
the direction of inflow of the working medium of the circulatory flow progresses onto the turbine wheel, parallel to the axis of rotation in axial direction of the hydrodynamic converter
Data Source
AI summary
A high-speed hydrodynamic adjustable converter having a working chamber for forming a hydrodynamic working medium circuit wherein a pump wheel, a turbine wheel and a guide wheel are positioned in the working chamber. The working medium flows through the pump wheel centrifugally or centrifugally-diagonally; and the working medium flows through the turbine wheel centripetally or centripetally-diagonally. The inlet grate edge of the turbine wheel, with respect to an axis of rotation of the pump wheel and the turbine wheel, is positioned on a smaller or equal radius than an inlet grate edge of the pump wheel. The hydrodynamic converter has a first guide wheel in the working chamber before the pump wheel viewed in the direction of flow of the working medium, the guide wheel being arranged for purely centrifugal or diagonal-centrifugal throughflow of the working medium and is used to influence the power transmission.