Fuel Filter Element Rotation to Break Seal Stiction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel filter assemblies for diesel engines do not allow for easy replacement of the filter element without fuel spillage, as the element is typically secured within the housing and cannot be removed separately from the collection bowl.
Innovation Solution
A filter assembly design where the filter element is removably supported within the housing, with a locating feature for the collection bowl and a rotation feature that breaks the seal stiction between the upper end cap and the filter head, enabling the element to rotate with the collection bowl during disassembly and preventing fuel spillage during replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter element is securely retained within the housing using the collection bowl, then the element is firmly positioned and sealed, but the element cannot be removed separately from the collection bowl, requiring the entire assembly to be replaced
Solution Approach 1:
The filter assembly is divided into separable components: the collection bowl, the filter element, and the housing. The collection bowl is designed to detach from the housing, and the filter element is designed to remain retained by the collection bowl during detachment, allowing the element to be carried away with the bowl for easy replacement without replacing the entire housing assembly.
Solution Approach 2:
The collection bowl acts as an intermediary carrier between the housing and the filter element. It provides a removable interface that secures the element during operation but can be detached to facilitate element replacement, serving as a mediator that enables both secure retention and easy replacement.
2Reliability
If the collection bowl is directly screwed onto the lower end cap of the element, then the element is securely positioned, but the element remains stuck to the head due to seal stiction and cannot be easily removed
Solution Approach 1:
Before removing the filter element, the collection bowl is unscrewed from the housing head. This preliminary action breaks the seal stiction between the element's upper end cap and the head, releasing the element from its stuck position and allowing it to be easily removed from the collection bowl without force or fuel spillage.
Solution Approach 2:
The connection between the collection bowl and the housing head is made dynamic and reversible through threading. The bowl can be screwed onto and off the head, transforming the static sealed connection into a dynamic removable connection that facilitates element replacement while maintaining secure positioning during operation.
3Reliability
If the element is retained within a spin-on cartridge, then the element is held firmly in place, but the element and components must be replaced as a unit, increasing complexity and cost
Solution Approach 1:
The spin-on cartridge assembly is segmented into replaceable parts: the collection bowl and filter element can be removed and replaced separately from the housing. This segmentation allows the element to be replaced independently without replacing the entire housing or cartridge assembly, reducing complexity and cost.
Solution Approach 2:
The filter element is extracted from the permanent housing structure and placed in a removable collection bowl. This extraction allows the element to be taken out and replaced independently, eliminating the need to replace the entire housing assembly and reducing overall system complexity.
Data Source
AI summary
A filter element is removably supported within a housing comprising a filter head and a collection bowl. The element is removed from the lower end of the housing when the collection bowl is removed. The element includes an annular side wall which supports the element on radial ribs within the collection bowl; and a series of projections or posts which engage ribs on the bowl and cause the element to rotate in conjunction with the bowl when the collection bowl is screwed off of the head. The rotation of the element breaks the seal stiction between an upper seal on the element and the filter head, such that the element remains with the bowl. Openings around the sidewall facilitate fluid flow around the lower end cap. The element is supported by the collection bowl as the bowl is removed, and easily removed from the bowl and replaced.