PTC heating device and electric heating device with such a PTC heating device and method for producing an electric heating device
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Solution Overview
Problem
The introduction of PTC heating devices into heating ribs is challenging due to the need for precise positioning to avoid damage, as the inner walls of the rib must abut the heat-emitting surface with good thermal conductivity, requiring a very small distance and precise alignment.
Innovation Solution
A frame-shaped casing with elastic guide tabs that project over the heat-emitting surfaces, allowing for centered positioning and easy introduction into the rib, with the guide tabs pivoting inwardly to facilitate alignment and prevent damage during insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the PTC heating device is introduced into the heating rib without guidance, then the assembly process is simple, but the positioning precision is insufficient causing damage risk
Solution Approach 1:
The guide tabs act as intermediary elements between the PTC heating device and the heating rib. These tabs extend from the casing and engage with corresponding guide structures in the receiving pocket, providing a mechanical interface that ensures precise alignment and centered positioning during insertion, thereby preventing damage while maintaining assembly simplicity
Solution Approach 2:
The guide tabs are pre-positioned on the casing before insertion into the heating rib. This preliminary positioning structure ensures that when the device is inserted, the alignment is already established, eliminating the need for complex real-time positioning adjustments during the assembly process
2Reliability
If the distance between inner walls and heat-emitting surface is reduced for good thermal conductivity, then the thermal conductivity improves, but the risk of damage during insertion increases
Solution Approach 1:
The guide tabs serve as protective intermediary elements that engage with the receiving pocket structure before the heat-emitting surface contacts the inner walls. This sequential engagement ensures that the insertion force is distributed through the guide structures rather than being concentrated on the fragile heat-emitting surface, preventing damage while enabling the necessary close proximity for effective thermal conduction
3Reliability
If precise positioning is required for safe insertion, then the damage risk is reduced, but the ease of operation decreases
Solution Approach 1:
The guide tabs provide a self-aligning mechanical interface that automatically centers the PTC heating device within the receiving pocket during insertion. This intermediary structure transforms a complex precision positioning task into a simple drop-in operation, where the guide tabs naturally guide the device into the correct position without requiring manual alignment adjustments
Solution Approach 2:
The guide tabs enable the insertion process to be self-aligning and self-centering. As the device is inserted, the guide tabs automatically engage with the receiving pocket structure and guide the device into proper alignment, eliminating the need for external positioning tools or manual adjustment operations
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
Enables simple and precise positioning of the PTC heating device within the heating rib, ensuring safe introduction and effective thermal conductivity without risk of damage, while allowing for deformation of the rib to ensure secure contact post-insertion.
Implementation Method 1
a leading frame member with elastic guide tabs which, in an initial assembly state, project on oppositely disposed sides of the frame-shaped casing over the heat-emitting open surface respectively associated with them, and which are inclined obliquely from the leading frame member in a direction of the open surface and are elastically pivotable
Implementation Method 2
the inner walls of the receiving pocket of the heating rib are to abut against the heat-emitting open surface of the PTC heating device with good thermal conductivity
Data Source
AI summary
A PTC heating device for introduction into a receiving pocket of an electric heating device includes at least one PTC element, a conductor track that is electrically connected to the PTC element, and insulating layers that are abutted in a thermally conductive manner against the PTC element. A frame-shaped casing joins the at least one PTC element, the conductor track, and the insulating layers as a unit. The frame-shaped casing has a leading frame member with elastic guide tabs which, in an initial assembly state, project on oppositely disposed sides of the frame-shaped casing over the heat-emitting open surface respectively associated with them, which are inclined obliquely from the leading frame member in a direction of the open surface, and which are elastically pivotable. During heating device assembly, the PTC heating device is centered and guided by the elastic guide tabs when introduced into a heating rib of a heating chamber.