Multi-Layered Pot-Shaped Heating Unit for Reducing Agent
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Solution Overview
Problem
Existing heating devices for liquid reducing agents in exhaust gas treatment systems face challenges in efficiently preventing freezing at low temperatures and ensuring reliable operation, particularly in motor vehicles, where the urea-water solution used as a reducing agent can freeze and clog filters, and existing solutions are complex and difficult to maintain.
Innovation Solution
A modular heating device with a pot-like container and carrier body that incorporates electrical and/or hydraulic connections, featuring a multi-layered structure with embedded electrical heating elements, allowing for easy maintenance and replacement, and using a plastic material resistant to the reducing agent, such as HDPE, to ensure effective heat transfer and resistance to reagents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heating device is integrated into the reducing agent tank, then freezing prevention is improved, but device complexity increases
Solution Approach 1:
The heating element is integrated directly into the container wall structure, merging the heating function with the container itself. This eliminates the need for separate heating devices and reduces overall system complexity while maintaining effective freezing prevention through direct thermal coupling with the reducing agent.
Solution Approach 2:
The container serves multiple functions: it stores the reducing agent, provides structural support, and acts as a heating element through its electrically conductive plastic material. This multi-functionality reduces the number of separate components needed, thereby simplifying the device while improving reliability.
2Temperature
If conventional heating elements are used, then heating effectiveness is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent changes the material parameter of the container from conventional plastic to electrically conductive plastic, which enables direct electrical heating. This material parameter change allows the container itself to function as a heating element, eliminating complex heating element installation while maintaining effective heating performance.
Solution Approach 2:
The container is made from composite material combining plastic with electrically conductive properties. This composite material simultaneously provides chemical resistance, structural integrity, and heating capability, simplifying manufacturing by eliminating the need to assemble separate heating elements into the container.
3Reliability
If the container is made from chemically resistant plastic, then resistance to reagents is improved, but heat transfer efficiency deteriorates
Solution Approach 1:
The patent changes the electrical and thermal parameters of the plastic material by incorporating electrically conductive additives. This creates a material that maintains chemical resistance while simultaneously improving thermal conductivity, allowing efficient heat transfer from the electrical heating elements through the container wall to the reducing agent.
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 solution provides a simple, effective, and maintainable heating system that prevents freezing of the reducing agent, ensures reliable operation of the exhaust gas cleaning system, and allows for easy access and replacement of components, thereby ensuring continuous functionality and reducing the risk of filter clogging.
Implementation Method 1
electrical heating elements embedded in at least one of the layers
Data Source
Figure 1~3
AI summary
The invention relates to a heating unit for a device for accommodating and providing liquid reducing agent consisting of a tank and a pot-shaped container extending into the tank interior, wherein at least one supply unit for the reducing agent and a connection for supplying the reducing agent are provided in the container as well as means for fixing the container on or in the tank, wherein a module insert is configured in the tank and has a carrier, wherein said carrier accommodates at least the supply unit and the connection for supplying the reducing agent. According to the invention, the module insert and/or the carrier and/or at least parts of the pot-shaped container have a multi-layered configuration and one of the layers accommodates electrical heating elements or electrical heating elements are embedded in at least one of the layers.