Compressed Air Filter Element Axial Sealing Design
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Solution Overview
Problem
Conventional compressed air filters face challenges with high friction forces during assembly and disassembly, complex construction requirements, and potential sealing issues due to axial O-rings and U-like seals, leading to increased operational difficulties and potential leaks.
Innovation Solution
A filter element design featuring a collar portion with an abutment face that radially expands a sealing element, allowing for axial force application to achieve sealing, reducing friction forces during closure, and using a single sealing element for simplified assembly and disassembly, with a sealing ring that maintains pretension and is securely retained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radial O-ring seal is used between housing upper portion and housing cap, then sealing is achieved, but substantial friction forces and friction moments must be overcome during closing and opening operations
Solution Approach 1:
The sealing function is extracted from the housing assembly and transferred to the filter element itself. The filter element incorporates an axial O-ring seal that seals between the element upper portion and the housing upper portion, eliminating the need for radial O-ring seals between housing components. This extraction resolves the contradiction by removing the source of high friction forces while maintaining sealing reliability.
Solution Approach 2:
The filter element acts as an intermediary component that provides the sealing function. Instead of sealing between housing upper portion and housing cap directly, the filter element's axial seal mediates the sealing requirement, allowing the housing components to be easily assembled and disassembled without overcoming substantial friction forces.
2Reliability
If axial O-rings and U-like seals are used for sealing, then sealing function is provided, but complex construction requirements and potential sealing issues occur
Solution Approach 1:
The sealing function is merged with the filter element structure. The axial O-ring seal is integrated into the filter element assembly, combining the filtering and sealing functions into a single component. This merging eliminates the need for separate sealing mechanisms between housing components, reducing construction complexity while ensuring reliable sealing.
Solution Approach 2:
Instead of providing sealing between housing components (external sealing), the sealing is inverted to occur within the filter element assembly (internal sealing). The axial O-ring seal is positioned between the element upper portion and housing upper portion, inverting the traditional sealing approach and simplifying the overall construction.
3Reliability
If high assembly forces are required for radial O-ring sealing, then sealing contact is ensured, but operational difficulties and potential leaks increase
Solution Approach 1:
The axial O-ring seal is positioned to engage with the housing upper portion's sealing surface at a predetermined location, providing partial sealing action at the critical interface. This targeted sealing approach ensures adequate sealing contact without requiring excessive assembly forces across the entire housing assembly, resolving the contradiction between sealing reliability and ease of operation.
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
This design reduces the need for high assembly forces, simplifies handling, ensures reliable sealing, and allows for easy detection of filter element absence, while maintaining effective sealing without axial support issues, thus improving operational efficiency and reducing component complexity.
Implementation Method 1
a force which acts substantially axially on the sealing element from the direction of the element lower portion brings about radial expansion of the sealing element along the abutment face
Data Source
AI summary
A compressed air filter and a filter element which is for separating foreign bodies from a compressed air stream and which has an element lower portion, an element upper portion which has a neck portion which forms a first flow channel and a collar portion which is constructed so as to extend at least partially around the neck portion and which is connected to the neck portion so as to form a second flow channel, and a filter medium which is sealingly connected to the element lower portion and the element upper portion in order to form a gas flow path between the first flow channel and the second flow channel through the filter medium, the collar portion having an abutment face, which is provided at least partially at the outer periphery and which tapers in the direction of the element lower portion, in order to receive an associated sealing ring in such a manner that a force which acts substantially axially on the sealing ring from the direction of the element lower portion brings about radial expansion of the sealing ring along the abutment face.