Stormwater Filter Assembly Locking Mechanism
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Solution Overview
Problem
Stormwater in urban areas often carries pollutants into natural bodies of water due to the lack of treatment systems, leading to environmental pollution, and existing filter systems face challenges in efficient installation and maintenance.
Innovation Solution
A stormwater filter assembly with a locking mechanism that secures the center tube to the bottom, featuring a boss with a rib for secure attachment to a deck stub, and an outlet conduit connection with a locking portion, facilitating easy assembly and installation, while utilizing a filter medium for effective pollutant removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is used to secure the center tube to the bottom, then the stability and reliability of the filter assembly is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is segmented into distinct functional elements: the boss with protrusions on the bottom, the tube tabs with hooks on the center tube, and the rib with locking portion. This segmentation allows each component to perform its specific locking function independently, providing reliable connection while keeping individual parts simple and manageable.
Solution Approach 2:
The locking mechanism is designed to be self-securing through the interaction of passive geometric features. The protrusions on the boss engage with the hooks on the tube tabs through elastic deflection, and the rib automatically mates with the locking portion on the deck stub. No additional actuators, fasteners, or complex mechanisms are required - the components lock together through their own structural features during assembly.
2Reliability
If multiple locking features are added to prevent rotation and relative movement, then the reliability of the connection is improved, but the manufacturing complexity increases
Solution Approach 1:
Multiple locking functions are merged into integrated features. The boss simultaneously provides protrusions for radial locking and a rib for rotational locking. The tube tabs combine the hook engagement for radial positioning with the ability to deflect elastically during assembly. This merging reduces the number of separate parts and simplifies manufacturing compared to using multiple independent locking components.
Solution Approach 2:
The tube tabs utilize elastic flexibility to simplify the locking process. The tabs can deflect outward during assembly to allow the protrusions to pass, then snap back to secure the connection. This elastic behavior eliminates the need for threaded fasteners, clips, or other complex mechanical locking devices, reducing manufacturing complexity while ensuring reliable connection.
3Reliability
If a secure locking mechanism is implemented, then the reliability of the filter assembly is improved, but the ease of operation during installation is worsened
Solution Approach 1:
The locking features are pre-configured in their respective components during manufacturing. The protrusions are already formed on the boss, the hooks are shaped on the tube tabs, and the rib is molded into the bottom. During installation, no additional steps are required to create these locking features - they simply engage with each other as the components are assembled, making the installation process straightforward despite the secure connection achieved.
Solution Approach 2:
The locking mechanism performs its securing function automatically during the normal assembly process. As the center tube is inserted into the bottom and rotated into position, the protrusions automatically engage with the hooks and the rib mates with the locking portion. The mechanism serves itself by using the assembly motion to create the locked state, eliminating the need for separate locking operations or specialized installation tools.
Data Source
AI summary
A filter assembly for use in filtering stormwater includes a bottom including a boss that includes a rib extending laterally along an inner surface of the boss. The rib includes a locking portion that mates with a corresponding locking portion on a peripheral surface of a connection to an outlet conduit for securing the bottom to the connection thereby inhibiting rotation of the bottom relative to the outlet conduit. A center tube is secured to the bottom using a locking mechanism that inhibits relative movement between the bottom and the center tube. The center tube is in communication with an opening in the bottom and a hood is secured to the center tube. A filter medium is located between the hood and the center tube.