Segmented Inner Tube Layout for Bent Vehicle Fluid Lines
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Solution Overview
Problem
Existing motor vehicle pipe elements for liquid pipes, particularly for reducing agents in exhaust tracts, face challenges in flow behavior and volume flow due to their interior cross-section, leading to issues with residual reducing agents and the need for powerful pumps for removal, as well as potential structural weaknesses during bending that can result in failure.
Innovation Solution
A motor vehicle pipe element with a multi-part inner tube body, where the inner tube body is formed by at least two separated pipe body elements arranged in the area of the bending section, ensuring that the inner tube body does not extend through the bending section and is interrupted there, thereby preventing structural weakening of the outer tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the inner pipe body is arranged inside the outer pipe to reduce internal volume, then the flow channel cross-section is reduced and reducing agent storage is optimized, but the outer pipe becomes susceptible to dents and wall thickness reduction during bending
Solution Approach 1:
The inner pipe body is divided into multiple segments (first inner pipe body segment, second inner pipe body segment, etc.) along the longitudinal axis. These segmented inner pipe bodies are arranged inside the outer pipe such that they do not extend continuously through the bending section, thereby preventing structural weakening of the outer pipe during bending while still achieving volume reduction in the straight sections.
2Stability of the object's composition
If the inner pipe body extends through the bending section, then continuous flow channel is maintained, but structural weakening occurs leading to cracks and failure
Solution Approach 1:
The inner pipe body is segmented into multiple parts along the longitudinal axis, with at least one segment positioned to not extend through the bending section. This segmentation prevents the inner pipe from constraining the outer pipe during bending, eliminating the risk of cracks while maintaining adequate flow channel continuity through proper positioning of segments.
3Power
If the internal cross-section is reduced to optimize reducing agent flow, then pump power requirements are reduced, but the storage capacity for reducing agent becomes insufficient
Solution Approach 1:
The piping element features locally differentiated cross-sections: the connecting section (with inner pipe body) has a reduced cross-section to minimize storage volume and reduce pump power requirements, while the buffer section (without inner pipe body) has a larger cross-section to provide sufficient storage capacity for reducing agent, thereby optimizing both parameters simultaneously.
Data Source
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AI summary
Motor vehicle piping element for liquid lines, in particular for conveying reducing agents into a motor vehicle exhaust system, comprising: - an outer tube (2) extending from an inlet opening (3) to an outlet opening (4), - an inner tube body (5) arranged within the outer tube (2) extending from an inlet opening (6) to an outlet opening (7) arranged at a distance from the outlet opening (4), and - a bending section (8) extending over a region of the inner tube body (5) and the outer tube (2), wherein the inner tube body (5) is formed in multiple parts in the longitudinal axis direction in the region of the bending section (8).