Bayonet-Connected Multi-Stage Fuel Filter Element
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Solution Overview
Problem
Existing multi-stage water separating fuel filter elements for motor vehicles are difficult to maintain due to their recessed design, making the replacement of filter elements complex and cumbersome.
Innovation Solution
A filter element design featuring a bayonet projection that engages with a bayonet receptacle in the filter housing cover, allowing the filter element to be easily removed with the cover, along with multiple cleaning stages including a particle filter medium, coalescer medium, sediment gap, and final separating screen, and a double seal system for secure and cost-effective mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter element is completely recessed in the filter housing, then the sealing and retention of the filter element is improved, but the ease of removal and maintenance of the filter element deteriorates
Solution Approach 1:
The filter element is segmented from the filter housing through the bayonet connection design, allowing the filter element to be partially recessed for sealing while maintaining external accessibility for easy removal. The bayonet projection and receptacle create a distinct separation between the retained filter element and the removable cover assembly.
Solution Approach 2:
The bayonet connection acts as an intermediary mechanism between the filter element and the filter housing cover. This intermediary allows the filter element to be securely retained when the cover is closed while enabling easy removal when the cover is opened, resolving the contradiction between secure retention and ease of removal.
2Ease of operation
If a bayonet connection is implemented, then the ease of removal and maintenance of the filter element is improved, but the device complexity increases
Solution Approach 1:
The bayonet connection serves multiple functions simultaneously: it provides mechanical retention of the filter element, enables easy removal and installation, and creates a self-aligning mechanism. This multi-functionality reduces the need for separate retention mechanisms, ultimately simplifying the overall device despite the added bayonet features.
Solution Approach 2:
The bayonet projection is merged with the filter element body and the bayonet receptacle is merged with the filter housing cover, creating an integrated connection system. This merging eliminates the need for separate fastening components, reducing overall device complexity while maintaining ease of maintenance.
3Reliability
If multiple cleaning stages are implemented, then the fuel cleaning performance is improved, but the device complexity and maintenance difficulty increase
Solution Approach 1:
The multiple cleaning stages are nested within a single integrated filter element structure. The particle filter medium, coalescer medium, and final separating screen are arranged in sequence within the same filter element, allowing all cleaning functions to be performed by one replaceable unit rather than multiple separate components.
Solution Approach 2:
The entire multi-stage filter element is designed as a disposable or easily replaceable unit. When maintenance is needed, the whole filter element is removed via the bayonet connection and replaced, rather than requiring disassembly and cleaning of individual stages. This approach simplifies maintenance despite the complexity of having multiple cleaning stages.
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 facilitates easy maintenance and secure retention of the filter element, reducing maintenance complexity and costs while ensuring effective multi-stage fuel cleaning and water separation.
Implementation Method 1
particles in the fuel are separated off by the particle filter medium
Implementation Method 2
first of all relatively large drops of water form from fine water droplets in the coalescer medium
Implementation Method 3
These drops of water sink in the sediment gap
Implementation Method 4
the final separating screen acts as a baffle plate for further separation of water in the fuel
Data Source
AI summary
Disclosed is a filter element (86) with multi-stage cleaning, and a fuel filter (84) having such a filter element (86). The filter element (86) has a particle filter medium, a coalescer medium, a sediment gap (98) and a final separator screen. The filter housing has a filter housing body (110) and a cover (106) screwed onto the filter housing body (110). When the cover (106) is unscrewed from the filter housing body (110), at least one bayonet projection (112) of the filter element (86) engages behind a corresponding bayonet receptacle (114), such that the cover (106) can be removed together with the filter element (86) arranged thereon by way of the bayonet connection.