Filter Cartridge Bypass Opening for Ice Pressure Dissipation
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Solution Overview
Problem
Filter cartridges in reducing agent delivery devices face challenges with impurities and freezing, leading to potential damage from ice pressure due to the expansion of reducing agents like AdBlue, which can freeze at low temperatures, causing a drastic pressure increase.
Innovation Solution
A filter cartridge design featuring a filter wall with small openings for filtration and a supporting wall for mechanical stability, along with a bypass opening to dissipate excess pressure by allowing filtered reducing agent to flow back out, preventing ice pressure buildup, and a coupling device for secure attachment to the delivery device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter cartridge is used to filter the reducing agent, then impurities are removed and filtration efficiency is improved, but the filter cartridge is vulnerable to damage from ice pressure when the reducing agent freezes
Solution Approach 1:
The filter cartridge is divided into multiple chambers separated by partition walls. Each chamber can independently handle pressure changes, preventing uniform stress distribution that would damage the entire filter structure during freezing events
Solution Approach 2:
Pressure equalization openings are provided in the partition walls to allow pressure equalization between chambers before freezing occurs. This preliminary pressure balancing prevents drastic pressure increases that would damage the filter cartridge structure
2Volume of moving object
If the reducing agent is stored in a limited space, then the delivery device compactness is improved, but freezing causes drastic pressure increase due to volume expansion
Solution Approach 1:
The storage space is segmented into multiple chambers by partition walls. This segmentation allows localized volume expansion in each chamber during freezing without transmitting excessive pressure throughout the entire confined space, protecting the delivery device structure
Solution Approach 2:
Pressure equalization openings in the partition walls enable preliminary pressure equalization between chambers before freezing-induced pressure buildup occurs. This prevents drastic pressure increases that would damage the compact delivery device
3Reliability
If a filter wall with small openings is used for filtration, then particle removal efficiency is improved, but flow resistance increases and pressure drop across the filter increases
Solution Approach 1:
The filter system is segmented into multiple chambers with partition walls containing pressure equalization openings. This segmentation allows the filter to maintain high particle removal efficiency while periodically equalizing pressure to prevent excessive pressure drop that would restrict flow rate
Solution Approach 2:
The pressure equalization openings act as intermediaries between chambers, allowing pressure balancing that maintains optimal flow conditions across the filter wall while preserving high particle removal efficiency
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 design effectively manages ice pressure by allowing pressure dissipation through the bypass opening, protecting the filter cartridge and delivery device from damage while maintaining efficient filtration and mechanical stability, even during freezing conditions.
Implementation Method 1
a bypass opening to dissipate excess pressure by allowing filtered reducing agent to flow back out, preventing ice pressure buildup
Implementation Method 2
A filter cartridge design featuring a filter wall with small openings for filtration
Implementation Method 3
The reducing agent AdBlue® freezes, for example, at −11° C. Such low temperatures may arise, in particular, during relatively long standstill phases of an internal combustion engine. An increase in volume therefore takes place when freezing occurs.
Data Source
AI summary
A filter cartridge for a delivery device for a reducing agent includes at least one filter wall and at least one supporting wall together forming an interior space. The at least one supporting wall has an outflow opening and a bypass opening. The outflow opening can be coupled to the delivery device and the bypass opening bypasses the filter wall. A delivery device and a motor vehicle having a filter cartridge are also provided.