Vehicle HVAC Filter Unit Elastic Deformation
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Solution Overview
Problem
The existing filter assemblies for vehicle HVAC systems face challenges in cost-effective production due to the requirement for non-rectangular filter units with complex shapes, such as pentagonal or 'cut-off' rectangular cross-sections, which are difficult and expensive to manufacture.
Innovation Solution
The filter unit is designed to undergo elastic deformation upon installation, transitioning from a rectangular to a trapezoidal cross-section, allowing for a simple and economical production method, with a flexible frame that can be partially or completely made from materials like textiles or plastics, and featuring open sections for enhanced flexibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter unit is manufactured with a non-rectangular cross-section (pentagonal or cut-off rectangular) to fit the filter holding housing, then the sealing and fit are improved, but the production cost and manufacturing complexity increase significantly
Solution Approach 1:
The filter unit changes its cross-sectional shape parameter from rectangular to trapezoidal through elastic deformation during installation. The frame material is selected with specific elastic properties that allow it to be compressed into the trapezoidal shape of the filter holding housing, achieving good sealing while keeping the initial manufacturing simple and rectangular.
2Stability of the object's composition
If the filter unit is made rigid to maintain stability during transportation and assembly, then the structural integrity is improved, but the ability to adapt to the filter holding housing shape is reduced
Solution Approach 1:
The filter unit frame is designed with dynamic characteristics - it maintains rigidity during transportation and assembly but can elastically deform when installed in the filter holding housing. The frame material and structure are selected so that the filter unit is stable when not installed but can adapt its shape when compressed into the housing, achieving both stability and adaptability at different stages.
3Ease of manufacture
If the filter unit is designed with a rectangular cross-section for simple production, then the manufacturing cost is reduced, but additional adaptation steps are required during installation
Solution Approach 1:
The filter unit performs self-adaptation during installation through elastic deformation. When the rectangular filter unit is compressed into the trapezoidal filter holding housing, it automatically deforms to match the housing shape without requiring additional adaptation steps or manual intervention. The elastic frame material enables this self-shaping capability, simplifying the installation process while maintaining low production costs.
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 approach reduces production costs while ensuring a secure press fit and improved sealing, allowing the filter unit to adapt seamlessly to the filter holding housing without additional adaptation steps, maintaining stability during assembly and transportation.
Implementation Method 1
the filter unit is squeezed at least at one of the edges of the filter unit transversely, i.e. in particular perpendicularly, to the direction of flow, as compared with the delivery condition... brought about by deformation, in particular elastic deformation, of the filter unit
Data Source
Figure 1~2
Figure 3~4
AI summary
A filter assembly (10) for a vehicle heating or air conditioning system comprises a filter unit (22) which is cuboidal in the delivery condition. This filter unit (22) is inserted into a filter holding housing (24) and, in the process, is compressed to give a different cross section, which preferably has a trapezoidal shape.