Filter With Air Gap For Thermal Expansion In Exhaust Systems
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Solution Overview
Problem
Existing filters in gas-carrying pipelines, particularly in motor vehicle exhaust systems, face issues with thermal expansion and contraction, leading to damage and reduced service life due to firm clamping and lack of space for temperature changes.
Innovation Solution
A filter design featuring a pipe socket with a bent end region and an air gap between the filter element and the socket, allowing for expansion and contraction, and eliminating the need for additional fixing components, with the bent end acting as a fixing component and axial support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter element is firmly clamped over a large area between the pipe socket and the sleeve, then the filter element is securely fixed, but the filter element cannot expand or contract during temperature changes, leading to damage and reduced service life
Solution Approach 1:
The filter element is divided into two functional zones: a fixing area where it is clamped between the pipe socket and fixing component, and a free area where it is not clamped and can move axially. This segmentation allows different parts of the filter element to serve different purposes - secure fixation in one zone and thermal accommodation in another.
Solution Approach 2:
The filter element is designed to be dynamically adaptable to temperature changes. In the free area, the filter element can expand axially when heated and contract when cooled, rather than being rigidly constrained. This dynamic behavior prevents thermal stress damage while maintaining filtration function.
2Reliability
If the filter element is firmly clamped during assembly, then it is securely fixed in position, but it can already be damaged during the clamping process
Solution Approach 1:
The clamping force is applied only in the fixing area, while the free area remains unclamped. This segmentation allows the filter element to be securely fixed where needed without subjecting the entire element to damaging clamping forces during assembly.
Solution Approach 2:
Different regions of the filter element have different fixation qualities. The fixing area has high fixation quality with strong clamping, while the free area has low or no fixation quality, allowing movement. This local differentiation protects the filter element from damage while ensuring secure mounting.
3Reliability
If additional fixing components like a sleeve are used to secure the filter element, then the filter element is firmly fixed, but the device complexity increases
Solution Approach 1:
The pipe socket is designed with an integrated fixing component (the bent end region) that combines the functions of the pipe socket and the separate sleeve fixing component found in prior art. This merging eliminates the need for additional separate fixing components while maintaining secure fixation of the filter element.
Solution Approach 2:
The bent end region of the pipe socket serves multiple functions: it provides structural support for the pipe, acts as the fixing component that secures the filter element, and creates the air gap for thermal expansion. This multi-functionality eliminates the need for separate dedicated fixing components.
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 design enhances the filter's service life and reliability by accommodating thermal changes, reducing the risk of damage and mechanical stress, while simplifying the connection process and improving flow efficiency.
Implementation Method 1
These temperature changes cause the filter material to expand when heated and contract when cooled
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A filter (1, 1', 1", 1'') for insertion into a pipeline (2) is proposed, comprising a pipe stub (3), a fixing component (5), in particular a sleeve, arranged in an end region (4) of the pipe stub (3) and at least partially enclosed by the pipe stub (3), and a filter element (6) having a fixing region (7) in which it is fixed between the pipe stub (3) and the fixing component (5). The filter (1, 1', 1", 1'") is characterized in that an air gap (8) is arranged outside the fixing region (7) between the filter element (6) and the pipe stub (3).