Filtration Device Housing Segmentation for Sheet Fixing
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Solution Overview
Problem
Existing medical filtration devices struggle to securely fix the filtration sheet, leading to potential displacement and reduced effectiveness in removing foreign matters from liquids.
Innovation Solution
A filtration device design featuring a housing with a first and second housing member that sandwich the filtration sheet, using a joining member to seal the gap between the housing members and securely fix the filtration sheet, preventing direct contact between the housing members and maintaining the filtration sheet's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filtration sheet is gripped by grip portions as in WO '215, then the filter element is less likely to be displaced, but the fixing strength of the filtration sheet can still be improved
Solution Approach 1:
The housing is divided into a first housing member and a second housing member that can be assembled separately. The filtration sheet is clamped between these two segmented housing members, allowing for easier assembly and disassembly while maintaining strong fixing. This segmentation resolves the contradiction by providing reliable fixation without requiring a complex monolithic housing structure.
Solution Approach 2:
The filtration sheet is pre-positioned between the first and second housing members before final assembly. The protrusions on the housing members engage with the filtration sheet in advance, ensuring proper positioning and preventing displacement during the assembly process. This preliminary action ensures reliable fixation while simplifying the overall assembly procedure.
2Reliability
If the first housing member and second housing member are in direct contact, then the structure is simpler, but the filtration sheet cannot be securely sandwiched and fixed
Solution Approach 1:
The filtration sheet itself acts as an intermediary element between the first and second housing members. By clamping the filtration sheet between these housing members, a secure connection is achieved without requiring the housing members to be in direct contact. This intermediary approach ensures reliable fixation while maintaining manufacturing simplicity.
Solution Approach 2:
The housing members feature localized protrusions that make contact with the filtration sheet at specific points. This local quality approach concentrates the clamping force where needed to secure the filtration sheet, while the rest of the housing members can be simpler in structure, thus maintaining ease of manufacture.
3Reliability
If the joining member seals the gap between housing members on the outer side, then liquid tightness is improved, but the structure becomes more complex
Solution Approach 1:
The joining member combines multiple functions into a single component: it mechanically connects the first and second housing members while simultaneously sealing the gap between them on the outer side. This merging of functions achieves liquid tightness without requiring separate sealing components, thus avoiding increased structural complexity.
Solution Approach 2:
The joining member serves as a multi-functional element that provides both structural connection and sealing properties. By making the joining member universal in its functionality, the design achieves liquid tightness without adding dedicated sealing structures, thereby maintaining simplicity in the overall device complexity.
Data Source
AI summary
A filtration device includes: a housing that defines a liquid flow path; and a filtration sheet that separates the liquid flow path into a flow path upstream side and a flow path downstream side. The housing includes: a first housing member and a second housing member that sandwich the filtration sheet, and a joining member that joins the first housing member and the second housing member in a state in which the filtration sheet is sandwiched between the first housing member and the second housing member. A gap is located between the first housing member and the second housing at a position outward of an outer edge of the filtration sheet. The joining member seals the gap between the first housing member and the second housing member at the position outward of the outer edge of the filtration sheet.