Exhaust Gas Treatment Device Water Separation Base
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Solution Overview
Problem
In exhaust gas treatment devices, particularly those close to the tailpipe, water can enter the housing and pose a risk of contacting the mounting mat and sensors, leading to thermal stresses and potential damage due to high temperature differences.
Innovation Solution
A separating base is introduced within the housing to structurally separate the outlet chamber from the collection chamber, with collars forming barriers around passage openings to prevent water from reaching the collection chamber, and a sensor is positioned to avoid direct water contact using a sensor socket with an annular groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the exhaust gas treatment device is positioned close to the tailpipe, then the installation space is optimized, but water can enter the housing and contact the mounting mat and sensors
Solution Approach 1:
The housing is segmented into an outlet chamber and a collection chamber using a separating base with collars. This segmentation creates a barrier that prevents water from the outlet chamber from reaching the mounting mat and sensors in the collection chamber, while maintaining compact installation space.
Solution Approach 2:
The separating base with collars acts as an intermediary barrier between the outlet chamber and collection chamber. The collars protruding into the outlet chamber create a physical obstacle that water cannot easily overcome, protecting the mounting mat and sensors from water contact.
2Ease of operation
If water enters the housing, then the outlet chamber can be accessed, but the mounting mat and sensors are exposed to thermal stresses
Solution Approach 1:
By dividing the housing into two chambers separated by the separating base, the patent allows the outlet chamber to remain accessible while isolating the mounting mat and sensors in the collection chamber from water exposure and associated thermal stresses.
Solution Approach 2:
The separating base with collars serves as a protective intermediary that blocks water from reaching the mounting mat and sensors, thereby preventing thermal stress damage while maintaining operational access to the outlet chamber.
3Manufacturing precision
If passage openings are provided in the separating base, then fluid communication between chambers is enabled, but water can potentially reach the collection chamber
Solution Approach 1:
The collars create localized barriers around the passage openings, providing different properties in different areas: the passage openings allow fluid communication, while the collars create hydrophobic barriers that prevent water from passing through, thus protecting the collection chamber.
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
Effectively reduces the risk of water contacting the mounting mat and sensors, preventing thermal stresses and ensuring reliable operation by containing water within the outlet chamber and allowing it to drip off safely, thus protecting the exhaust gas treatment elements and sensors.
Implementation Method 1
the collars that border the passage openings form barriers that water cannot easily overcome
Implementation Method 2
The funnel reduces the flow resistance at the transition to the outlet pipe and leads to an acceleration of the exhaust gas flow
Implementation Method 3
the water can only spread to the outer groove, where it collects and drips off due to gravity
Data Source
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AI summary
The present invention relates to an exhaust gas treatment device (1) for an exhaust system of an internal combustion engine, in particular of a road vehicle, comprising a housing (2) in which at least one exhaust gas treatment element (3) is arranged and mounted by means of a bearing mat (5), and an outlet pipe (10) which is fluidically connected to an outlet chamber (11) formed in the housing (2). The risk of contamination of the bearing mat (5) with water can be reduced by a separation base (13) which is arranged in the housing (2) and separates the outlet chamber (11) from a collection chamber (12), if the separation base (13) has several passage openings (14) through which the outlet chamber (11) is fluidically connected to the collection chamber (12) and which are each enclosed by a collar (15) projecting into the outlet chamber (11).