Variable Geometry Turbine Width Changing Mechanism
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Solution Overview
Problem
Variable geometry turbines with complex link mechanisms face reliability and failure rate issues due to increased engine performance and uneven flow angles in the scroll flow channel, where fluid inflow is large near the start and reduced near the end, leading to performance deterioration.
Innovation Solution
A variable geometry turbine with a simplified structure featuring a width changing mechanism that adjusts the passage width of the throat passage along the circumferential direction of the turbine impeller, allowing for continuous adjustment of flow angles and flow rates, reducing the number of components and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex link mechanism is used to adjust flow rate characteristics in accordance with engine output, then the adaptability to different engine outputs is improved, but the reliability and failure rate of components deteriorate
Solution Approach 1:
The patent removes the complex link mechanism from the turbine structure, extracting only the essential function of flow rate adjustment. The width changing mechanism directly modifies the throat passage width without requiring intermediate linkages, thereby improving reliability while maintaining adaptability.
Solution Approach 2:
The patent implements a dynamic width changing mechanism that can continuously adjust the throat passage width in response to engine output conditions. This dynamic adjustment capability replaces the need for complex discrete link mechanisms, providing smooth adaptability while simplifying the overall structure.
2Stability of the object's composition
If the passage width of the throat passage is adjusted along the circumferential direction, then the flow angle distribution uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by varying the passage width at different circumferential positions of the throat passage. The width changing mechanism creates non-uniform width distribution along the circumferential direction, which compensates for the natural flow angle variations and achieves uniform flow angle distribution across the turbine impeller inlet.
Solution Approach 2:
The patent introduces circumferential dimension variation to the throat passage width, transforming a one-dimensional flow control problem into a two-dimensional solution. By adjusting width in the circumferential direction rather than only in the flow direction, the patent achieves flow angle uniformity with a relatively simple mechanism.
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 solution enables flexible adjustment of flow rates and angles, preventing uneven flow distributions and improving performance by reducing the complexity of the turbine structure, thus enhancing reliability and efficiency.
Implementation Method 1
a passage width of the throat passage is changed by the width changing mechanism (that is, the flow channel area of the throat passage is adjusted), and it is thus possible to adjust the flow rate of a fluid (for example, an exhaust gas discharged from an engine) flowing into the turbine impeller
Implementation Method 2
a turbine impeller configured to rotate about an axis line
Implementation Method 3
a turbine housing configured to accommodate the turbine impeller and form a throat passage and a scroll flow channel on an outer circumferential side of the turbine impeller
Implementation Method 4
the flow angle of a fluid flowing into a turbine impeller to any angle in the circumferential direction of the turbine impeller
Data Source
AI summary
Provided are a variable geometry turbine and a supercharger including the same that can change flow rate characteristics of a turbine in accordance with engine output with simple structure and can adjust the flow angle of a fluid flowing into a turbine impeller to any angle in the circumferential direction of the turbine impeller. The variable geometry turbine (10) includes a turbine impeller (12) configured to rotate about an axis line, a turbine housing (30) configured to accommodate the turbine impeller (12) and form a throat passage (32) and a scroll flow channel (34) on the outer circumferential side of the turbine impeller (12), the scroll flow channel (34) communicating with the throat passage (32), and a width changing mechanism in which a width change portion (52) that changes a passage width of the throat passage (32) along the circumferential direction of the turbine impeller (12) is movable in the width direction of the passage width.