Segmented Turbine Housing Sleeve for Thermal Insulation
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Solution Overview
Problem
The existing turbine housing designs face challenges in manufacturability and thermal energy loss due to the integrated structure of sleeves, which complicates machining and increases thermal energy loss from exhaust gas contact with the inner wall surfaces.
Innovation Solution
A turbine housing design featuring a sleeve with multiple sections along the flow direction, a recess portion, and a projecting portion for easy assembly and secure fixation, along with a thermal barrier coating and heat insulating material to minimize contact and heat input, improving manufacturability and reducing thermal energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an integrated structure sleeve is mounted to the turbine housing, then thermal energy loss is reduced by preventing direct contact between exhaust gas and inner wall surface, but manufacturability deteriorates due to difficulty in machining the integrated sleeve into suitable shapes
Solution Approach 1:
The sleeve is divided into a first sleeve and a second sleeve that are separately mounted to different regions of the turbine housing. This segmentation allows each sleeve to be independently machined into suitable shapes for specific regions (inlet/outlet sections), improving manufacturability while maintaining the thermal insulation function of preventing direct contact between exhaust gas and the housing inner wall surface.
2Ease of manufacture
If the sleeve is divided into multiple sections, then manufacturability is improved by enabling separate machining, but device complexity increases due to multiple components
Solution Approach 1:
The first sleeve and second sleeve are positioned adjacent to each other along the inner wall surface of the turbine housing, with their combined structure forming a continuous protective layer. This merging approach reduces the functional complexity despite having multiple components, as the sleeves work together as a unified thermal insulation system while allowing individual machining simplicity.
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 enhances manufacturability and reduces thermal energy loss by preventing direct contact between exhaust gas and the inner wall surfaces, maintaining a reliable gap for reduced heat input and improved turbocharger performance.
Implementation Method 1
a thermal barrier coating on an inner surface of the sleeve, and a heat insulating material disposed between the sleeve and an inner wall surface of at least one of the inlet section or the outlet section of the housing body
Data Source
Figure 1
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Figure 3A~3B
AI summary
A turbine housing includes: a housing body which is configured to accommodate a turbine wheel and which includes an inlet section forming an inlet flow passage for guiding exhaust gas to the turbine wheel, and an outlet section forming an outlet flow passage for discharging the exhaust gas from the turbine wheel; and at least one sleeve disposed along an inner wall surface of at least one of the inlet section or the outlet section of the housing body. The at least one sleeve includes a plurality of sections divided along a flow direction of the exhaust gas.