Filter Device Radial Gasket Sealing Design
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Solution Overview
Problem
Existing filter devices rely on axial seals that require strong tightening for security, which can lead to deformation issues in plastic end caps and are not reliable, especially when using inexpensive and poorly adapted replacement parts.
Innovation Solution
A filter device design featuring a thread-free section on the connecting piece of the end cap for a sealing region, using a radial gasket that is independent of screw tightening force, with threads in the filter element and a receiving pipe piece on the housing cover for secure sealing, allowing for the use of specialized pipe pieces for specific filter elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an axial sealing edge is used on the end cap, then the sealing function is achieved, but strong tightening force is required which can deform plastic end caps
Solution Approach 1:
A separate sealing element (radial gasket) is introduced as an intermediary component between the connecting piece and the receiving pipe piece. This gasket assumes the sealing function, allowing the end cap to be tightened without requiring excessive force that would deform the plastic material.
Solution Approach 2:
The sealing approach transitions from an axial sealing edge (one-dimensional contact) to a radial gasket (two-dimensional sealing surface). This dimensional change distributes the sealing function over a larger area, reducing the localized stress and required tightening force on the end cap.
2Reliability
If strong tightening is applied to ensure seal security, then sealing reliability improves, but the end cap may deform
Solution Approach 1:
The radial gasket acts as a mediator that provides a compliant sealing interface. It compensates for minor dimensional variations and maintains seal integrity without requiring high clamping forces that would compromise the end cap's dimensional stability.
Solution Approach 2:
The sealing mechanism changes from force-dependent (axial seal requiring high tightening force) to geometry-dependent (radial gasket sealing through its radial configuration). This parameter change allows reliable sealing while maintaining the end cap's dimensional stability under normal tightening conditions.
3Ease of manufacture
If threads are incorporated directly into the housing cover, then manufacturing is simplified, but sealing reliability depends on tightening force
Solution Approach 1:
The radial gasket serves as an intermediary sealing component that decouples the sealing function from the tightening force. This allows the housing cover to be manufactured with simple threaded connections while maintaining reliable sealing through the gasket's radial sealing action.
Data Source
AI summary
A filter device has a filter element (3) in a filter housing (1). Corresponding threads (23, 33) form a screw connection between a housing cover (5) of the filter housing (1) and the filter element (3). A seal (29, 35) is between the filter element (3) and the housing cover (5). The screw connection is formed by threads (33) on a connecting pipe piece (31) that is part of an end cap (17) of the filter element (3) and that extends into the inner filter cavity (22) and by the threads (23) of the housing cover (5). The housing cover threads (23) are on a receiving pipe piece (21) formed by a separate component attached to the housing cover (5).