Filter Drainage Connection Using Radial Sealing Surfaces
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Solution Overview
Problem
Existing filter systems face challenges in achieving a simple, cost-effective, and error-free tight connection, particularly in applications requiring pressure and temperature resistance, such as air de-oiling and oil filtration, where traditional threaded connections are complex and costly to produce and dispose of.
Innovation Solution
A filter design featuring an elastic outer seal and an elastic inner seal with opposing circumferential sealing surfaces that interact to form a pluggable seal, allowing for a bayonet connection that eliminates the need for central metal threads, enabling a metal-free construction with improved sealing and reduced assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional threaded connections are used to connect filter housing with connection head, then pressure-tight connection is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The sealing function is segmented into two separate seals (first seal and second seal) positioned at different locations, each contributing to the overall pressure-tight connection. The first seal is arranged at the front end of the filter housing while the second seal is positioned at the rear end, dividing the sealing task into multiple independent elements that work together to achieve reliable pressure-tight connection without requiring complex threaded structures.
Solution Approach 2:
The connection system transitions from relying solely on axial threading to incorporating radial sealing elements. The seals are arranged to act in the radial direction perpendicular to the axial connection direction, adding a dimensional aspect to the sealing mechanism that complements the axial plug-in connection and achieves pressure-tight sealing without complex threading.
2Reliability
If traditional threaded connections with multiple sealing means are used, then pressure-tight connection is achieved, but manufacturing and disposal costs increase
Solution Approach 1:
Multiple sealing functions are merged into an integrated sealing system where the first and second seals work together in a coordinated manner. The seals are positioned to create overlapping sealing zones that collectively achieve pressure-tight connection, eliminating the need for separate complex sealing mechanisms and reducing manufacturing steps while maintaining reliable sealing performance.
Solution Approach 2:
The filter housing and connection head are designed with simple sealing elements that can be easily manufactured and replaced. The sealing system uses straightforward geometric seal shapes that are cost-effective to produce, and the entire filter assembly can be disposed of and replaced as a unit when needed, reducing long-term maintenance and sealing component replacement costs.
3Ease of operation
If bayonet connection with interacting pluggable seal is used, then assembly simplicity and error exclusion are improved, but sealing space design complexity increases
Solution Approach 1:
The sealing surfaces of the first and second seals are pre-configured with specific geometric features (such as tapered surfaces or positioning ridges) that automatically guide the filter housing into correct alignment with the connection head during the plug-in motion. This preliminary geometric configuration ensures proper sealing engagement before the final locked position is reached, simplifying the assembly operation while managing sealing space requirements.
Solution Approach 2:
The bayonet connection mechanism with interacting pluggable seal is designed to self-align and self-seal during the plug-in motion. The geometric features of the seals and sealing surfaces automatically position themselves to create the pressure-tight connection without requiring external alignment tools or complex adjustment mechanisms, achieving ease of operation through self-service functionality.
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 facilitates a secure, easy-to-assemble connection with reduced parts and costs, enhanced sealing efficiency, and improved tolerance compensation, while allowing for metal-free production that minimizes corrosion and disposal issues, and reduces pressure loss by optimizing fluid flow.
Implementation Method 1
an elastic outer seal (23) which is used to seal the raw side of the filter (1) from the collection space (10), and an elastic inner seal (24), which is used to seal the clean side of the filter (1) from the collection space (10)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a filter (1) having a drainage outlet (31), which can be tightly connected to a connecting head (12). It is proposed to use an insertion seal having radially opposite sealing surfaces of an outer seal (23) and an inner seal (24).