Filter Cartridge Interlock for Alignment and No-Filter-No-Run
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Solution Overview
Problem
Existing filtration assemblies face challenges in ensuring proper installation and alignment of filter cartridges, preventing improper cartridge installation, and maintaining a no-filter-no-run condition without modifying the filter head, while being mechanically robust, convenient, and cost-effective.
Innovation Solution
A filtration assembly design featuring a filter housing main part with a recess arrangement and a filter cartridge with radial extensions that interlock, making improper installation difficult and ensuring the cartridge is always present, with features like deformable materials and blocking mechanisms to prevent assembly without a cartridge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter cartridge is installed in a filter assembly, then filtration function is provided, but it is difficult to ensure proper alignment and positioning during installation
Solution Approach 1:
The filter cartridge incorporates asymmetric features including a single radial extension at a specific angular position and corresponding asymmetric recesses in the filter bowl. This asymmetric configuration provides automatic alignment during installation, ensuring the cartridge is properly positioned without requiring complex alignment procedures by the installer.
Solution Approach 2:
The radial extension acts as an intermediary alignment feature between the filter cartridge and filter bowl. This intermediate element engages with the corresponding recess in the bowl, serving as a mechanical mediator that guides and secures the cartridge in the correct position during installation.
2Reliability
If the filter assembly is designed to prevent improper cartridge installation, then reliability is improved, but device complexity increases
Solution Approach 1:
The asymmetric radial extension and recess configuration inherently prevents improper installation by allowing the cartridge to be installed only in the correct orientation. The asymmetric features create a mechanical lock that prevents rotation or misalignment, ensuring reliability without requiring additional complex locking mechanisms or control systems.
3Ease of manufacture
If the cartridge remains attached to the bowl during removal, then clean servicing is enabled and liquid containment is improved, but clearance requirements are increased
Solution Approach 1:
The radial extension is designed to engage with the recess in advance, creating a preliminary mechanical connection between the cartridge and bowl. This pre-established connection ensures that when the bowl is removed, the cartridge remains securely attached, preventing liquid leakage and enabling clean servicing without requiring additional containment measures.
4Reliability
If radial extensions with threaded portions are used to prevent assembly without cartridge, then no-filter-no-run condition is achieved, but manufacturing complexity increases
Solution Approach 1:
The single radial extension with threaded portion creates an asymmetric configuration that prevents the filter bowl from being assembled onto the filter head without the cartridge in place. The threaded feature engages with corresponding threads in the bowl, creating a mechanical interlock that ensures the no-filter-no-run condition while using standard manufacturing processes.
Data Source
AI summary
A filter assembly is disclosed comprising a filter cartridge, a filter housing end part, and a filter housing main part, said filter housing main part being adapted for receiving said filter cartridge and for being connected to the housing end part by screwing, whereinsaid filter housing main part comprises a first longitudinal axis and a main opening, said main opening being defined by a first end portion, said first end portion comprising an upper, interrupted rim and a first threaded portion arranged below said upper rim;said first end portion comprising a recess arrangement comprising one or more axially extending recesses, said one or more axially extending recesses at least partially interrupting said first threaded portion;said filter cartridge comprises a second longitudinal axis and a first end cap, said first end cap comprising a central portion and a radial extension arrangement comprising one or more radial extensions extending radially away from said central portion; andwherein said radial extension arrangement is adapted for being receivable or received by said recess arrangement; and associated cartridges.