Liquid Filter Assembly With Staged Sealing and Drainage
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Solution Overview
Problem
Existing filter assemblies with top-mounted covers face contamination and spilling risks during element removal due to leakage of used lubricant, despite drainage channels and standpipes, as they are not adequately designed to handle angular misalignment and drainage efficiency.
Innovation Solution
A filter assembly design with concentric outlet and drainage orifices, where the axial distance between sealing elements differs, allowing the drainage orifice to seal first during removal, ensuring the outlet remains sealed, and incorporating guiding mechanisms to maintain the filter element's angular orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If drainage channel and standpipe are provided to drain element before removal, then contamination risk is reduced, but leakage and spilling still occur during cover removal
Solution Approach 1:
The drainage orifice is positioned to drain the element before the cover is fully removed, and the sealing element geometry ensures the outlet orifice seals before the drainage orifice opens during removal. This preliminary sequencing of sealing and drainage actions prevents contamination and spilling during the critical transition period when the cover is being removed.
Solution Approach 2:
The invention changes the geometric parameters of the sealing elements relative to their corresponding orifices. The first sealing element has a different radial extent and axial positioning compared to the second sealing element, creating a staged sealing/drainage sequence that prevents leakage while enabling drainage.
2Ease of operation
If cover is attached to top of module, then access is improved, but risk of lubricant spilling over equipment and operator increases
Solution Approach 1:
The drainage system is designed to drain the element in advance of cover removal, and the differential sealing element geometry ensures the outlet seals before drainage opens. This preliminary action sequence maintains the top-mounted cover advantage for accessibility while eliminating the spilling hazard that would otherwise be present during removal.
3Productivity
If drainage orifice is plugged by eccentric protrusion, then drainage function is achieved, but misalignment and improper installation cannot be detected
Solution Approach 1:
The invention uses asymmetric (non-concentric) positioning of the drainage orifice relative to the outlet orifice, and the sealing elements have different radial extents. This asymmetric geometry creates a mechanical interlock that only permits proper installation when the filter element is correctly aligned, while still maintaining effective drainage function.
4Ease of manufacture
If sealing elements are positioned at same axial distance from orifices, then manufacturing is simplified, but staged sealing and drainage cannot be achieved
Solution Approach 1:
The invention deliberately changes the geometric parameters of the sealing elements, specifically their axial positioning and radial extents, so that the first sealing element engages its orifice at a different axial position than the second sealing element. This parameter variation enables the critical staged sealing/drainage sequence that controls the timing of these functions during cover removal.
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
Reduces contamination and spilling by enabling efficient drainage of used lubricant while maintaining the outlet's seal, thus minimizing service time and ensuring proper installation alignment.
Implementation Method 1
a first sealing element and a second sealing element, the first sealing element and the second sealing element being arranged at different axial positions
Implementation Method 2
a drainage orifice with a second sealing zone, the outlet orifice and the drainage orifice being concentric
Data Source
AI summary
The disclosure pertains to a filter assembly comprising a base, a cover, and a cylindrical filter element, the base being adapted to receive the cover with the filter element inserted therein. The base has an outlet orifice with a first sealing zone, and a drainage orifice with a second sealing zone. The filter element comprises an outlet tube with a first sealing element, and a drainage plug with a second sealing element, said outlet tube and said drainage plug being positioned to sealingly engage with said first sealing zone and said second sealing zone, respectively, when the base receives the cover. An axial distance (A) between the first sealing element and the second sealing element is different from an axial distance (B) between an end of the first sealing zone and an end of the second sealing zone facing the filter element. The present disclosure also pertains to a filter element for use in such a filter assembly.