Turbocharger Air Duct Constricting Rings Expansion Control
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Solution Overview
Problem
Elastomeric air ducts in turbocharger systems experience expansion under high pressures and temperatures, leading to interference with surrounding components, increased manufacturing costs, and noise issues due to unrestrained pressurized ducts.
Innovation Solution
A flexible duct with longitudinally spaced constricting rings made of molded thermoplastic, applying radial compression to limit volume increase to less than 20% under operating pressure, using linking ribs for spacing and a clasp for retention, maintaining low costs and conventional rubber material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If elastomeric duct sections are used to provide easy installation and accommodate variable alignment, then ease of installation and adaptability are improved, but the duct expands under high pressure and temperature causing interference with surrounding components
Solution Approach 1:
The duct is segmented by inserting constricting rings at specific intervals along its length. These rings divide the continuous elastomeric duct into sections, with each section constrained by adjacent rings. This segmentation allows the duct to maintain flexibility and ease of installation while preventing excessive expansion under pressure, as each segment is independently controlled by the constricting rings.
Solution Approach 2:
The constricting rings provide localized reinforcement at specific positions along the duct without affecting the entire duct's flexibility. The rings create localized rigid structures that prevent expansion in critical areas, while the elastomeric sections between rings maintain their flexible, adaptable properties for easy installation and alignment accommodation.
2Object-affected harmful factors
If metal helix reinforcement with heat shrink polymeric sock is used to prevent duct expansion, then duct expansion is limited, but manufacturing cost and installation difficulty increase greatly
Solution Approach 1:
The constricting rings are made from inexpensive thermoplastic material that can be easily molded and installed. Unlike expensive metal helix reinforcements requiring specialized installation equipment and procedures, these plastic rings can be simply slipped over the duct and secured with clips or ties. The low material cost and simplified installation process dramatically reduce both manufacturing and installation costs while effectively limiting duct expansion.
Solution Approach 2:
The invention replaces the complex mechanical system of metal helix springs requiring compression and heat shrinkage with a simpler static constraint system. The constricting rings provide rigid geometric constraints that passively limit duct expansion without requiring active mechanical forces or specialized installation equipment, thereby reducing manufacturing complexity and cost.
3Object-affected harmful factors
If composite multi-layered charge air ducts with reinforcing plies are used to address expansion, then duct expansion is controlled, but manufacturing cost and environmental issues increase
Solution Approach 1:
The invention extracts only the essential reinforcement function from complex composite structures. Instead of using multi-layered composite materials with reinforcing plies, the constricting rings provide the necessary structural support through simple geometric constraints. This extraction of the core function eliminates the need for environmentally problematic composite materials while maintaining effective expansion control.
Solution Approach 2:
The invention changes the material parameter from complex composite materials to simple thermoplastic rings. This parameter change maintains the structural reinforcement function while using more environmentally friendly, easily recyclable materials. The rings achieve the same expansion control effect as composite structures but with simpler, more sustainable materials that reduce environmental impact.
4Object-affected harmful factors
If duct reinforcement is provided to limit expansion, then duct expansion is controlled, but the stiffness increases making installation more difficult
Solution Approach 1:
The duct system is segmented into flexible elastomeric sections and rigid constricting ring sections. The flexible sections maintain ease of installation and adaptability, while the rigid rings provide expansion control only where needed. This segmentation allows the duct to be installed easily like a flexible hose while still achieving the expansion control benefits of rigid reinforcement.
Solution Approach 2:
Rigidity is applied locally at the constricting ring positions rather than throughout the entire duct. The elastomeric sections between rings remain flexible and easy to install, while the rings provide localized rigid constraints that prevent expansion. This local application of rigidity maintains overall installation ease while achieving the necessary expansion control.
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 effectively limits duct expansion, preventing interference and noise while maintaining low manufacturing costs, ensuring reliable operation and reduced noise disturbances.
Implementation Method 1
Each constricting ring applies a radial compression force around a respective circumference of the duct
Data Source
AI summary
A turbocharger system includes a flexible duct having an elongated elastomeric body extending longitudinally between first and second ends configured to attach to respective turbocharger devices. A plurality of constricting rings are spaced longitudinally between the ends. Each constricting ring applies a radial compression force around a respective circumference of the duct. Each ring is comprised of a molded thermoplastic retained in a concentric shape by a clasp. The spacing of the constricting rings has a density sufficient to limit a volume increase of the duct under turbocharger operating pressure to less than 20%.