Filter Cartridge Key Ring Lock-Out Mechanism
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Solution Overview
Problem
Existing filter systems, such as bowl-cartridge and spin-on canister filters, face issues with incorrect cartridge replacement and confusion when multiple filters are mounted on a common filter head, leading to potential catastrophic consequences due to the lack of a secure locking mechanism.
Innovation Solution
A filter cartridge with a key ring and protrusions that engage a lock-out assembly in the filter head, ensuring correct installation, and a filter assembly with a locking sleeve and ring mechanism that prevents accidental connection without a proper filter cartridge, providing a secure locking system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a standard bowl-cartridge filter or spin-on canister filter is used, then the filter can be easily installed and removed, but there is no mechanism to prevent incorrect cartridge replacement or confusion when multiple filters are mounted on a common filter head
Solution Approach 1:
The filter cartridge features an asymmetric key ring with protrusions positioned at specific locations that must align with corresponding recesses in the filter head. This asymmetric configuration ensures that only the correct cartridge orientation and type can be installed, preventing incorrect replacement while maintaining ease of installation through a simple rotational locking action.
Solution Approach 2:
The key ring with protrusions is pre-configured on the filter cartridge before installation. During installation, the operator must first align these protrusions with the filter head receptacles before the filter can be properly mounted. This preliminary alignment action ensures correct cartridge replacement is verified before the filter becomes operational.
2Productivity
If multiple filter assemblies are mounted on a common filter head, then the system can be serviced efficiently, but the service person can get mixed-up regarding which filter assembly goes on where
Solution Approach 1:
Each filter cartridge is equipped with a unique key ring configuration where the number, position, and arrangement of protrusions are specific to that particular filter type and application. This localized differentiation at the cartridge level ensures that each filter assembly can only be installed in its correct location on the filter head, eliminating confusion when servicing multiple filters simultaneously.
3Reliability
If a locking mechanism is added to prevent incorrect installation, then reliability is improved, but the device complexity increases
Solution Approach 1:
The locking function is extracted from a complex mechanical locking system and simplified to a geometric key ring mechanism with protrusions. This extracted approach provides secure locking through simple shape complementarity between the key ring protrusions and filter head receptacles, maintaining reliability while minimizing added complexity.
Solution Approach 2:
The key ring is designed as a simple, inexpensive component that is integral to or attached with the disposable filter cartridge. This simple locking element provides adequate security for the application without the complexity of reusable, sophisticated locking mechanisms, as the entire cartridge including the key ring is replaced periodically.
Data Source
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AI summary
A filter cartridge includes a key ring with at least first and second protrusions to engage a lock-out assembly in a filter head, permitting the cartridge to connect to the filter head. A filter system includes a filter assembly, including a filter cartridge and a cartridge housing, connected to a filter head, in which the filter head includes an adapter assembly with a lock-out mechanism. The lock-out mechanism is unlocked by a key ring on the filter cartridge. A method of installing a filter assembly includes using protrusions on a key ring on a filter cartridge to unlock an adapter assembly in a filter head to allow for connection between the filter assembly and the filter head.