Filter Cartridge Torsion Lock With Sliding Piston Against Back-Off
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Solution Overview
Problem
Existing liquid filters face challenges in securely attaching to filter heads, particularly in preventing detachment due to lack of effective torsion locking mechanisms, which can lead to fluid leaks and operational instability.
Innovation Solution
A filter cartridge design featuring a movable piston with a torsion lock detent and spring mechanism, along with a catch configuration, that securely attaches to a filter head using interlocking detents and axial forces, ensuring a rigid connection and easy detachment with controlled torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter cartridge uses a thread connection to attach to a filter head, then the attachment can be easily installed and removed, but the filter cartridge may back off or detach during operation due to insufficient locking
Solution Approach 1:
The filter cartridge incorporates a movable piston that can slide axially within the canister. This dynamic element allows the piston to move during installation to engage the torsion lock detent, and then lock in place during operation to prevent detachment, while still allowing controlled removal when needed
Solution Approach 2:
The attachment mechanism is divided into separate functional components: a thread connection for basic attachment, a torsion lock detent for rotational locking, and a movable piston with spring for axial locking. This segmentation allows each component to perform its specific function while working together to provide both secure attachment and ease of operation
2Reliability
If a filter cartridge uses a torsion lock detent mechanism, then the filter can be securely locked to the filter head, but the mechanism becomes more complex
Solution Approach 1:
The torsion lock detent mechanism is merged with the piston assembly and spring system. The detent is formed as an integral part of the piston, and the spring is housed within the same assembly, reducing the number of separate components and simplifying the overall structure while maintaining reliable locking functionality
Solution Approach 2:
The spring-loaded piston automatically engages the torsion lock detent with the filter head during installation without requiring manual intervention. The mechanism self-activates through the axial movement of the piston, eliminating the need for complex control systems or additional locking steps
3Stability of the object's composition
If a filter cartridge uses a movable piston with spring mechanism, then the natural frequency increases to over 200 Hz, but the device complexity increases
Solution Approach 1:
The movable piston with spring mechanism serves multiple functions simultaneously: it provides axial locking through the torsion lock detent, acts as a seal carrier, and functions as a mass element to increase the natural frequency of the filter assembly. This multi-functionality reduces the need for separate components to achieve each function
4Reliability
If a filter cartridge uses a catch configuration to retain the piston, then the piston is securely held in position, but the mechanism becomes more complex
Solution Approach 1:
The catch mechanism is nested within the canister structure, with the catch forming an integral part of the canister wall. The piston is nested within the canister and is retained by the catch without requiring separate retention components. This nesting approach minimizes the number of parts while ensuring secure piston retention
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 design provides a secure attachment that maintains a natural frequency of over 200 Hz, preventing inadvertent detachment and ensuring reliable fluid filtration, while allowing easy removal with minimal torque, thus enhancing operational stability and ease of maintenance.
Implementation Method 1
a spring mechanism, along with a catch configuration
Implementation Method 2
torsion lock detent arrangement... preventing detachment
Data Source
AI summary
A filtration assembly is provided that comprises a filter cartridge and a filter head, that has particular application for liquid filtration, such as engine fuel filtration in an embodiment. The filter cartridge can include a thread and a torsion lock detent to provide twist and lock mounting to the filter head. Separately, the filter cartridge can include a slidable piston that can become pressurized by application of liquid pressure during operation that can apply an axial force to the filter head to load the thread and increase threaded attachment rigidity and/or the natural frequency of the filter cartridge to a more desirable level, and thereby limit vibrational impacts.