Circular Drain Strainer Assembly for Front-Access Sealing
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Solution Overview
Problem
Existing drain strainer assemblies in vehicles like aircraft, trains, and ships are prone to component misplacement, leaking, and difficult maintenance due to complex designs and limited access, leading to increased downtime and operational costs.
Innovation Solution
A simplified drain strainer assembly with a circular cross-section housing and strainer member assembly featuring interlocking engagement tabs, a circular sealing o-ring, and front-accessible design for easy maintenance and reduced component count, eliminating the need for wing screws/bolts and improving sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional drain strainer assembly with multiple components (housing, strainer member, wing screws/bolts, o-ring) is used, then the strainer can effectively capture debris and particulate matter, but the number of components increases leading to potential misplacement and increased complexity
Solution Approach 1:
The patent combines the housing and strainer member into a single integrated assembly where the strainer member is permanently attached to the housing. This eliminates the need for separate wing screws/bolts and reduces the number of discrete components while maintaining the straining function. The integrated design prevents component misplacement and simplifies the overall assembly.
Solution Approach 2:
The integrated housing-strainer assembly serves multiple functions simultaneously: it provides structural support, performs debris capture, and eliminates the need for separate fastening components. The single-component design achieves what previously required multiple specialized parts.
2Strength
If wing screws/bolts are used to secure the strainer member, then the strainer can be firmly attached to the housing, but the components can be misplaced during use rendering the assembly inoperable
Solution Approach 1:
By integrating the strainer member directly to the housing as a single unit, the patent eliminates removable fastening components (wing screws/bolts) that could be misplaced. The permanent attachment ensures the strainer remains securely attached during operation while preventing component loss.
3Reliability
If the strainer member is elongated with a complex shape, then it can capture debris effectively, but it becomes difficult to access for cleaning and maintenance in limited space
Solution Approach 1:
The patent designs the strainer member with a compact, segmented structure that can be easily accessed and removed for cleaning. The circular cross-section and modular engagement tabs allow the strainer to be divided into manageable sections that can be accessed in limited spaces, maintaining debris capture efficiency while improving maintainability.
Solution Approach 2:
Instead of designing an elongated strainer that extends into difficult-to-reach areas, the patent inverts the approach by creating a compact strainer that can be easily accessed from the front. The engagement tabs are positioned to allow straightforward removal and insertion, making maintenance simple even in confined spaces.
4Ease of repair
If the strainer member is removed laterally for cleaning, then maintenance can be performed, but a large extraction envelope is required consuming valuable space
Solution Approach 1:
The patent inverts the traditional lateral removal approach by designing the engagement tabs to allow front-access removal. The tabs are positioned and oriented so the strainer member can be pulled straight out from the front of the housing, eliminating the need for lateral movement and reducing the required extraction envelope to minimal space.
Solution Approach 2:
The patent changes the dimension of removal from lateral (horizontal) to axial (front-to-back). The engagement tabs are designed to engage and disengage in the axial direction, allowing the strainer to be removed along the axis of the housing rather than requiring lateral clearance, thus saving valuable side space.
5Reliability
If an elongated o-ring seal is used between the housing and strainer member, then sealing can be provided, but over-tightening causes the middle to flex away compromising the seal
Solution Approach 1:
The patent uses a circular o-ring seal instead of an elongated rectangular seal. The circular shape distributes compression forces uniformly around the sealing interface, preventing localized flexing and maintaining seal integrity even under varying tightening conditions. The circular geometry is inherently more resistant to deformation than elongated shapes.
Solution Approach 2:
The patent changes the geometric parameters of the seal from an elongated rectangular cross-section to a circular cross-section. This parameter change allows the seal to better accommodate compression forces and maintain sealing effectiveness across a wider range of tightening conditions without flexing away from the sealing surface.
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
The solution reduces the number of components, minimizes downtime, enhances maintenance efficiency, and optimizes space usage by allowing front-accessible maintenance, reducing leaks, and lowering operational costs while ensuring effective debris filtration.
Implementation Method 1
a circular sealing o-ring providing a seal between the housing and the strainer member assembly
Data Source
AI summary
A drain strainer assembly includes a housing having a circular cross-section, with an inlet port, an outlet port, and a plurality of first engagement tabs. The drain strainer assembly also includes a strainer member assembly having a circular cross-section. The strainer member assembly includes a strainer member with a solid front surface having a handle and a plurality of second engagement tabs interlocked with the first engagement tabs on the housing. The strainer member also includes cylindrical strainer sidewalls defining a circular opening at the back of the strainer member, and has an upper conduit aligned with the inlet port of the housing. The strainer member assembly also includes a circular strainer disk coupled to the strainer member with a fastener and covering the circular opening at the back of the strainer member.