Flat Heating Block Assembly With Keyed Element Positioning
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Solution Overview
Problem
The existing electrical heating devices for motor vehicles face challenges in manufacturing simplicity and cost-effectiveness due to complex assembly requirements and the need for precise positioning of heat generating elements within the housing, which increases manufacturing complexity and costs.
Innovation Solution
The introduction of fitting elements on the heat generating elements and corresponding receptacles on the housing ensures that heat generating elements can only be installed at predetermined positions, simplifying assembly by preventing random placement and allowing for the use of identical heat dissipating elements, thus streamlining the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If heat generating elements are allowed to be placed freely in the housing, then assembly is more flexible and easier, but manufacturing precision and positioning accuracy deteriorate
Solution Approach 1:
Fitting elements and fitting element receptacles are introduced as intermediary components between the heat generating elements and the housing. The fitting elements on the heat generating elements engage with corresponding receptacles in the housing, serving as a mediating mechanism that guides and constrains the heat generating elements to predetermined positions during assembly, thereby achieving both ease of assembly and precise positioning
2Manufacturing precision
If complex positioning mechanisms are used to ensure precise positioning of heat generating elements, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The positioning function is segmented into separate components: fitting elements attached to heat generating elements and fitting element receptacles integrated into the housing. This segmentation allows the positioning mechanism to be simple and modular, avoiding the need for complex integrated positioning systems while achieving precise positioning through the engagement of these simple segmented components
3Ease of manufacture
If standardized identical components are used for all heat generating elements, then manufacturing cost decreases and ease of manufacture improves, but adaptability to different positions deteriorates
Solution Approach 1:
While the heat generating elements themselves remain identical and standardized, the fitting element receptacles in the housing are designed with asymmetric or position-specific characteristics. This allows identical heat generating elements to be adaptively positioned at different locations through the asymmetric receptacle designs, maintaining both manufacturing simplicity and position-specific adaptability
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 solution ensures accurate and efficient assembly of the heating device layers, reducing the risk of installation errors and allowing for more economical production by standardizing components and simplifying the housing design, enabling easier injection molding and assembly by less skilled personnel.
Implementation Method 1
The heat generating elements of the heating block normally comprise several PTC heating elements which are provided overlapping in one plane and are arranged between printed conductors which are normally formed by sheet metal bands. These printed conductors carry current with different polarities.
Implementation Method 2
The heat produced by the heat generating elements is dissipated through heat dissipating elements to the medium to be heated, i.e. the air.
Data Source
AI summary
An electrical heating device includes a flat heating block, which is held in a housing forming oppositely situated frame openings and which comprises parallel layers of heat dissipating and heat generating elements. The heat generating elements on the face side have fitting elements projecting beyond the heating block, and fitting element receptacles assigned to these fitting elements are formed on the housing. The fitting elements and the assigned fitting element receptacles of different heat generating elements are formed such that the heat generating elements cannot be inserted at just any random place in the housing.