Seawall Filter Assembly with Conical Nested Filtration
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Solution Overview
Problem
Existing seawall filters are difficult to install and service, have limited filtration surface area, and can damage boats due to their design, requiring frequent replacement and posing risks to both the structure and vessels.
Innovation Solution
A seawall filter assembly featuring a conical housing, cage, filter element, and cap, which are easy to install and service without tools, provide a large filtration surface area, and are designed to fit flush with the seawall surface, minimizing damage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conduit extending outwardly from the seawall is used, then the filter element can be accessed from the outer side, but the conduit can damage boats that dock along the seawall and is itself prone to damage
Solution Approach 1:
The harmful protruding conduit is completely removed from the system. Instead, a flush-mounted filter assembly is installed where the filter element is accessed through a recessed opening in the seawall, eliminating the protruding structure that caused damage to boats and itself being vulnerable to damage.
Solution Approach 2:
Instead of extending the filter access outwardly from the seawall surface, the design inverts the approach by recessing the filter assembly into the seawall, with the opening flush with or recessed from the outer surface, thereby eliminating the harmful protrusion while maintaining accessibility.
2Ease of manufacture
If a simple hole in the seawall is used for drainage, then installation is simple, but excessive amounts of soil escape along with water
Solution Approach 1:
Multiple filtration components are nested within each other: the filter element is nested within a cage, which is nested within a housing, which is nested within the seawall hole. This nested structure provides progressive filtration while maintaining a compact installation that is as simple as drilling a hole.
Solution Approach 2:
A filter element made of porous material is installed within the housing. The porous structure allows water to pass through while retaining soil particles, solving the soil loss problem while maintaining installation simplicity through a single integrated unit that fits into the drilled hole.
3Device complexity
If a disc filter element with surface area equal to conduit cross-section is used, then the conduit structure is simple, but the filter element must be replaced frequently
Solution Approach 1:
The filter element geometry is changed from a flat disc (two-dimensional surface area equal to conduit cross-section) to a conical shape that extends axially along the conduit length. This dimensional extension dramatically increases the filtration surface area without increasing the conduit cross-sectional dimensions, thereby extending filter service life while maintaining structural simplicity.
Solution Approach 2:
The filter element uses a conical (curved) geometry instead of a flat disc. The conical shape provides increased surface area for filtration within the same conduit volume, improving filter effectiveness and service life without complicating the overall conduit structure.
4Reliability
If the filter is placed underground on the inner side of the seawall, then the filter is protected, but digging is required to gain access for cleaning
Solution Approach 1:
The filter assembly is pre-assembled with the housing, cage, and filter element configured to be installed as a single unit into the seawall hole. This preliminary assembly ensures proper protection and positioning, while the design inherently provides access from the outer side for future maintenance without requiring digging.
Solution Approach 2:
The housing acts as an intermediary structure that provides protection for the filter element while simultaneously enabling access from the outer side. The housing is configured to be installed in the seawall with an opening facing outward, serving as both a protective enclosure and an access portal for filter maintenance.
Data Source
AI summary
A filter assembly for a seawall filters the flow of groundwater through a hole in the wall. The filter assembly includes: (a) a housing containing a flat flange and a perforated conical shell, the shell adapted to extend into the hole with its apex extending toward the landward side, the flange having a seaward side adapted to fit flushly against the seawall, the flange having a landward side connected to the shell, the flange having an opening that defines an open base for the shell; (b) a perforated conical cage having an open base that fits within the shell of the housing; (c) a conical filter element having an open base that fits within the cage; (d) a perforated conical sleeve having an open base that fits within the filter element; and (e) a perforated cap that is removably and flushly fastened to the opening in the flange to secure the cage, filter element, and sleeve within the shell of the housing.