Variable Displacement Supercharger Disc Spring Seal
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Solution Overview
Problem
The existing variable displacement supercharger experiences reduced sealability due to temperature deformation and non-uniformity in the circumferential direction, affecting the sealing performance of the scroll flow passage.
Innovation Solution
A variable displacement supercharger with a turbine housing, a variable nozzle unit, and an annular seal member featuring a disc spring structure that biases the turbine housing and nozzle ring in the axial direction, enhancing sealability by maintaining contact despite temperature changes and reducing exposure to exhaust gas temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing body is used to seal the gap between the turbine housing and the exhaust gas introducing wall, then the sealability is improved, but the sealing performance is reduced due to non-uniform temperature deformation in the circumferential direction
Solution Approach 1:
The sealing structure is divided into multiple independent sealing elements (first sealing element and second sealing element) positioned at different locations. Each sealing element independently seals a specific gap region, allowing them to deform locally without affecting the entire sealing body uniformly, thus maintaining sealing effectiveness despite temperature variations.
Solution Approach 2:
Different sealing elements are positioned at specific locations where gaps occur, rather than using a single continuous sealing body. The sealing elements have different structural characteristics suited for their specific positions, with the first sealing element having a first end fixed to the turbine housing and the second sealing element having a second end fixed to the exhaust gas introducing wall, allowing localized adaptation to temperature deformation.
2Reliability
If the seal member is placed to seal the gap between turbine housing and nozzle ring, then sealing performance is improved, but the complexity of the structure increases
Solution Approach 1:
The sealing elements utilize flexible membrane structures that can deform to accommodate temperature-induced dimensional changes. The first sealing element and second sealing element are configured as flexible components that maintain contact with the mating surfaces despite thermal expansion and contraction, providing effective sealing without requiring complex adjustable mechanisms.
Solution Approach 2:
The sealing elements act as intermediary components between the turbine housing and the exhaust gas introducing wall (or nozzle ring), providing a dedicated sealing interface that isolates the gap sealing function from the main structural components. This allows the housing and introducing wall to be designed for their primary functions while the sealing elements handle the sealing requirement.
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 improved sealability enhances the performance of the supercharger by maintaining effective sealing despite temperature variations, reducing thermal deformation, and simplifying manufacturing while ensuring durability.
Implementation Method 1
the seal member has a disc spring structure which is inserted into the gap and biases the turbine housing and the nozzle ring in an axial direction of rotation of the turbine impeller
Data Source
AI summary
A variable displacement supercharger includes a turbine having: a turbine housing that forms a scroll flow passage disposed around a turbine impeller; a variable nozzle unit that includes a second nozzle ring that faces the scroll flow passage and forms a part of an inner wall of the scroll flow passage; and an annular seal member that seals the gap between the turbine housing and the second nozzle ring. The seal member has a disc spring structure that is inserted into the gap and biases the turbine housing and the second nozzle ring in an axial direction of rotation, and is arranged further inside than the scroll flow passage in the radial direction of the turbine impeller.