Twin-Scroll Turbocharger Turbine With Single Linear Wastegate Valve
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Solution Overview
Problem
Existing exhaust gas turbochargers with single-flow turbine housings, also known as monoscroll turbines, negatively impact gas exchange in internal combustion engines, leading to increased back pressure, consumption, and response behavior issues due to the individual cylinders' exhaust gas exchange effects. Additionally, the use of two valves for wastegate and flow connection in double-scroll turbines increases costs and installation space requirements.
Innovation Solution
A turbine design with a double-flow housing and a single linear valve that acts on both flows, where the linear valve element is guided through a partition wall to control wastegate outlets and flow connections, reducing space requirements and ensuring precise operation by allowing the valve to open and close in a linear motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-flow turbine housing is used, then the structure is simpler, but the gas exchange performance deteriorates due to negative effects from individual cylinders
Solution Approach 1:
The turbine housing is divided into two separate flow paths (first and second flows) with individual scrolls, allowing exhaust gases from different cylinders to be separated and directed through different paths, thereby improving gas exchange performance while maintaining manageable structural complexity
2Adaptability or versatility
If two separate valves are used for wastegate and flow connection in double-scroll turbines, then the control functionality is complete, but the installation space and costs increase
Solution Approach 1:
A single linear valve is designed to perform multiple functions: it controls both the wastegate opening and the flow connection between the two scrolls. By merging these control functions into one valve mechanism, the installation space is reduced while maintaining complete control functionality
Solution Approach 2:
The linear valve is designed as a multi-functional component that can simultaneously or separately control wastegate opening and flow connection between scrolls, making it a universal control element that replaces what would traditionally require two separate valves
3Area of stationary object
If a linear valve with adjustment shaft guided through partition wall is used, then the space requirement is reduced and operation precision is improved, but the valve mechanism complexity increases
Solution Approach 1:
The adjustment shaft is guided through the partition wall in an axial direction (linear motion), changing from traditional rotational or lateral guidance to axial guidance. This dimensional change allows the valve to be compactly integrated into the partition wall structure, reducing space requirements while the linear guidance mechanism simplifies the overall valve operation
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention relates to a turbine (3) for an exhaust turbocharger, having a turbine housing (9), which has two volutes (22, 23), through which an exhaust gas can flow and which are separated by a separating wall (21), and having only one wastegate valve (32) for both volutes (22, 23), which is designed as a linear valve (35) and which has a linear valve element (35a), wherein the linear valve element (35a) is held in the separating wall (21) and is movably guided in the separating wall (21) in the axial direction of the linear valve element.