Offset Holding Arm for Metering Valve Thermal Protection
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Solution Overview
Problem
Existing holding flanges for metering valves in exhaust gas purification modules do not adequately address thermal protection while minimizing installation space, leading to inefficient heat management and potential thermal conduction issues.
Innovation Solution
The holding flange design features offsetting holding arms with non-standard cross-sectional forms and extended lengths, along with a retaining lug offset from the central axis, reduces heat input to the metering valve by optimizing heat transfer and using insulating elements, allowing direct mounting on the exhaust gas purification module without intermediate elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the holding arm is designed with standard rectangular or circular cross-section, then the manufacturing is simple, but the thermal protection and cooling performance are insufficient
Solution Approach 1:
The holding arm is designed with a non-uniform cross-section where the circumferential length varies along its length. Specifically, the cross-section has a larger circumferential length in regions requiring better cooling (closer to the metering valve) and a smaller circumferential length in regions where thermal insulation is prioritized. This local variation in cross-sectional geometry optimizes heat dissipation where needed while maintaining manufacturing feasibility.
Solution Approach 2:
The holding arm employs an asymmetric cross-sectional form that deviates from standard symmetric shapes (rectangular or circular). The cross-section features different dimensions in different directions, with the circumferential length being specifically optimized to balance cooling performance and thermal insulation. This asymmetric design allows tailored thermal management while remaining manufacturable.
2Temperature
If the holding arm is extended in length to improve cooling, then the thermal protection is enhanced, but the installation space increases
Solution Approach 1:
The holding arm's cross-sectional parameters are optimized to achieve better cooling performance without proportionally increasing its length. By varying the circumferential length of the cross-section along the arm's length, the design maximizes heat dissipation efficiency within a compact form factor, reducing the need for excessive arm extension.
Solution Approach 2:
The holding arm utilizes a composite cross-sectional design combining regions of different circumferential lengths, effectively creating a functionally graded structure. This allows the arm to provide enhanced cooling where needed while maintaining a compact overall length through strategic placement of high heat-dissipation sections.
3Temperature
If the foot and retaining lug are arranged offset in circumferential direction, then the thermal conduction to metering valve is reduced, but the structural complexity increases
Solution Approach 1:
The foot and retaining lug are deliberately positioned at different circumferential locations on the holding arm, creating an asymmetric arrangement. This offset positioning interrupts the direct thermal conduction path from the exhaust system through the holding arm to the metering valve, reducing heat input while maintaining structural integrity and avoiding excessive complexity.
4Temperature
If intermediate elements are used for mounting the metering valve, then the thermal insulation is improved, but the device complexity and manufacturing costs increase
Solution Approach 1:
The thermal insulation function is integrated directly into the holding arm structure itself, eliminating the need for separate intermediate insulating elements. The holding arm's non-uniform cross-section and offset feature arrangement provide inherent thermal management, simplifying the overall device by removing unnecessary intermediate components while maintaining effective thermal insulation.
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 configuration enhances thermal protection of the metering valve, reduces heat input, and minimizes material and manufacturing costs while maintaining effective mounting and cooling performance.
Implementation Method 1
a heat input into the retaining lug is reduced so that a heat input to the metering valve is likewise reduced
Implementation Method 2
the increased circumferential length L is accompanied by an increased area of the holding arm which brings with it an improved cooling
Implementation Method 3
the smaller cross-sectional area F is accompanied by a diminished thermal conduction via the holding arm
Data Source
AI summary
The disclosure relates to a retaining flange for a metering valve for an exhaust gas cleaning module of an exhaust gas system of a combustion engine, wherein the retaining flange has a base plate having a central recess with a central axis for receiving the metering valve, wherein the base plate has a mounting surface via which the retaining flange can be positioned on the exhaust gas cleaning module in the region of a supply opening of the exhaust gas cleaning module, wherein a valve surface is provided opposite the mounting surface against which the metering valve can be positioned and wherein at least one retaining arm having a retaining eyelet with a central axis and for a retaining means is provided, on which the metering valve can be at least indirectly fixed, such that the at least one retaining arm has a root connecting to the base plate, from which the retaining arm extends in the radial direction relative to the central axis and in the circumferential direction about the central axis, wherein the root and the retaining eyelet are arranged offset to one another in the circumferential direction.