Shock-absorbing Flexible Pipe with Knitted Mesh
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Solution Overview
Problem
Existing flexible pipes in automobile exhaust systems suffer from high costs, non-ideal shock-absorbing effects, and premature failure due to unreasonable structures, leading to abnormal noise and vibration issues.
Innovation Solution
A shock-absorbing flexible pipe is designed with a corrugated metal pipe, a buckle hose, and an inner knitted hose with a double-layer or multi-layer knitted mesh structure, where the inner knitted hose is arranged between the buckle hose and the corrugated metal pipe to enhance elasticity and thermal insulation, reducing vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a buckle hose is added inside the corrugated pipe to reduce thermal shock and noise, then thermal protection and noise reduction are improved, but the buckle hose easily collides with the corrugated pipe producing abnormal noise and the structure becomes more complex
Solution Approach 1:
The patent applies nesting by placing the knitted hose inside the corrugated pipe, which is itself inside the buckle hose, creating a multi-layer nested structure. This nested arrangement allows each layer to perform its specific function (thermal protection, vibration absorption, structural support) while maintaining a compact overall design, resolving the contradiction between comprehensive protection and structural complexity
Solution Approach 2:
The knitted hose acts as an intermediary element between the buckle hose and the corrugated pipe. It provides a buffer layer that prevents direct collision between the buckle hose and corrugated pipe, thereby eliminating abnormal noise while maintaining the thermal protection and noise reduction functions of the buckle hose
2Manufacturing precision
If spacers are used to maintain installation position, then positioning is improved, but the spacers are inconvenient to install and cannot play buffering role once they slide
Solution Approach 1:
The knitted hose provides self-positioning through its elastic properties. As it expands and contracts with thermal changes and vibrations, it automatically maintains the correct installation position and buffering gap without requiring separate spacer components. This eliminates the need for complex spacer installation while ensuring continuous buffering capability
Solution Approach 2:
The patent utilizes the parameter changes of the knitted hose (elasticity, thermal expansion) to maintain installation position dynamically. The hose adjusts its dimensions in response to temperature and vibration changes, automatically compensating for position variations without requiring mechanical spacers, thus improving both positioning accuracy and installation ease
3Loss of substance
If a woven hose in plane structure is used, then material consumption is reduced, but it lacks necessary elasticity and has non-ideal shock-absorbing effect
Solution Approach 1:
The patent employs a knitted hose with a three-dimensional mesh structure that provides flexibility and elasticity while using minimal material. The knitted construction allows the hose to deform elastically under vibration and thermal stress, providing effective shock absorption without requiring substantial material quantity, thus resolving the contradiction between material efficiency and shock-absorbing performance
4Reliability
If elastic component is arranged on external surface of corrugated metal pipe, then vibration buffering is improved, but material consumption increases and cost becomes higher
Solution Approach 1:
The patent nests the knitted hose inside the corrugated pipe rather than placing it on the external surface. This internal arrangement provides vibration buffering through the hose's elastic deformation while using less material compared to external coverage. The nested configuration allows the knitted hose to directly absorb vibrations from the exhaust gas flow, maintaining effectiveness while reducing material consumption and cost
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 provides a reliable, cost-effective, and long-lasting shock-absorbing flexible pipe with improved vibration inhibition and thermal-insulation effects, suitable for various automotive conditions, reducing material consumption and production costs.
Implementation Method 1
the inner knitted hose is arranged between the buckle hose and the corrugated metal pipe to enhance elasticity and thermal insulation, reducing vibration and noise
Implementation Method 2
the inner knitted hose at least partially has a double-layer or multi-layer knitted mesh structure
Implementation Method 3
the inner knitted hose is arranged between the buckle hose and the corrugated metal pipe to enhance elasticity and thermal insulation
Data Source
AI summary
A shock-absorbing flexible pipe includes a corrugated metal pipe and a buckle hose. The buckle hose is sleeved and connected with the corrugated metal pipe. An inner knitted hose is arranged between the buckle hose and the corrugated metal pipe. The inner knitted hose at least partially has a double-layer or multi-layer knitted mesh structure.