Motor Vehicle Liquid Filter Spill Prevention
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Solution Overview
Problem
Liquid fuel or oil spills over when the vessel is unscrewed from the filter head due to fuel or oil flowing into the vessel from above, causing overflow and making filter replacement messy.
Innovation Solution
A liquid filter design with a filter element having guide projections that position and seal within the vessel, allowing the element to axially shift when detached, creating a volume for incoming liquids and preventing overflow, and featuring closeable ventilation holes to manage pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the vessel is unscrewed from the filter head, then the filter element can be replaced, but liquid fuel or oil spills over the rim of the vessel
Solution Approach 1:
The filter element is pre-assembled into the vessel before the vessel is screwed onto the filter head. This preliminary assembly ensures that the filter element is properly positioned and sealed before the filter is installed in the liquid circuit, preventing spillage during subsequent replacement operations
Solution Approach 2:
An element guide is provided that extends axially beyond the rim of the vessel. This element guide acts as an intermediary structure that guides and constrains the filter element, preventing it from moving outward or spilling liquid when the vessel is unscrewed from the filter head
2Reliability
If the filter element is fixed in position within the vessel, then sealing is improved, but the filter element cannot accommodate axial movement during detachment
Solution Approach 1:
The filter element is designed to be movable within the vessel along the axial direction. The element guide provides constraints that allow axial movement while preventing radial displacement. This dynamic design enables the filter element to move axially during detachment to accommodate pressure changes and liquid influx, while maintaining sealing through the guided movement path
Data Source
AI summary
A liquid filter suitable for motor vehicles which includes a filter head (11), a vessel (12) and a filter element (16) disposed within the vessel (12) sealingly separating an inlet (14) from an outlet (15) such that liquid from the inlet must flow through the filter element to reach the outlet. The filter element (16) has guide projections (27, 28) positioning the filter element (16) within the vessel (12). Prior to installation, the filter element (16) is preassembled into the vessel (12) and fixed in position by pushing the filter element (16) into an element guide (29), after which the preassembly is screwed onto the filter head (11). When the vessel (12) is unscrewed from the filter head (11), the filter element (16) slides out of the element guide (29) and moves axially upwardly to free a volume V. Liquid flowing into the vessel (12) from the higher regions of the liquid filter (10) can flow into this volume, thus enabling drip-free replacement of the filter element.