Multi-section Turbocharger Turbine Casing Thermal Insulation
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Solution Overview
Problem
Turbocharger turbine housings lose significant heat to the surroundings, reducing the efficiency of catalytic converters in internal combustion engines and increasing CO2 emissions due to the need for additional fuel to rapidly heat them up, which contradicts emission reduction goals.
Innovation Solution
The turbine housing is divided into sections with thermal insulation applied between them, using multiple layers of materials like fiber mats and shells to minimize heat loss and maximize heat transfer to the catalytic converters, allowing for adjustable insulation based on temperature requirements and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If thermal insulation is applied to the turbine housing, then heat loss to surroundings is reduced, but heat transfer to catalytic converter is also reduced
Solution Approach 1:
The turbine housing is divided into multiple sections (first section, second section, third section) with different thermal insulation characteristics. The first section has thermal insulation to reduce heat loss, the second section has enhanced thermal conductivity to maximize heat transfer to the catalytic converter, and the third section has thermal insulation. This segmentation allows different parts of the housing to serve different thermal functions simultaneously.
Solution Approach 2:
Different sections of the turbine housing are assigned different thermal properties (insulation vs. conduction) based on their specific functional requirements. The second section specifically has enhanced thermal conductivity to facilitate heat transfer to the catalytic converter, while other sections have insulation to reduce overall heat loss to surroundings.
2Ease of repair
If the turbine housing is divided into multiple parts, then maintenance accessibility is improved, but structural complexity increases
Solution Approach 1:
The turbine housing is segmented into multiple detachable sections that can be separated for maintenance access to the turbocharger interior. After maintenance, the sections are reconnected using connection elements that ensure proper alignment and sealing, thus enabling easy repair while managing structural complexity through standardized connection mechanisms.
3Loss of energy
If thermal insulation is used between housing parts, then heat loss is reduced, but manufacturing complexity increases
Solution Approach 1:
The thermal insulation element is placed within a recess of the housing section, and the connection element is received within a recess of the opposing housing section. This nesting arrangement integrates the insulation and connection functions into the housing structure itself, reducing the need for separate assembly steps and simplifying manufacturing.
Solution Approach 2:
The housing sections combine different materials with different thermal conductivities in a composite structure. The housing material itself provides structural strength, while integrated thermal insulation elements provide thermal management, creating a composite structure that addresses both structural and thermal requirements in a single manufacturing process.
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
This solution reduces CO2 emissions and fuel consumption by effectively utilizing exhaust heat for catalytic converter operation, extending the service life of the turbocharger through replaceable insulation and optimizing heat management.
Implementation Method 1
thermal insulation applied between them, using multiple layers of materials like fiber mats and shells to minimize heat loss and maximize heat transfer to the catalytic converters
Data Source
Figure 1
Figure 2~3
AI summary
The turbocharger (10) has a turbine housing, which has two units (11A,11B). The units are arranged to a common central axis (23). The central axis corresponds to gas passage directions (13,15) through the turbocharger. The units of the turbine housing are screwed together. A thermal insulation is inserted between the two units of the turbine housing. The insulating mats or insulating shells are made from fiber fabric or mineral fibers, for example glass, silicate or ceramic fibers.