Bayonet Filter Coupling With Staged Sealing for Easier Assembly
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Solution Overview
Problem
Existing filter arrangements experience sealing issues and are difficult to mount and dismount, particularly at varying pressures and temperatures, due to the design of bayonet-type quick-connect fittings that require high coupling efforts and are prone to material property changes.
Innovation Solution
A filter arrangement with a bayonet connecting device that ensures reliable mounting and dismounting by axially compressing contact portions and elastic elements, featuring a radial sealing mechanism that is less temperature-dependent, using a combination of rotational and longitudinal movements to sequence tightening and coupling efforts, and includes a sealing element that covers a groove for enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a bayonet-type quick-connect fitting is used for coupling body members, then quick mounting and dismounting is achieved, but high coupling efforts are required and material property changes cause sealing issues
Solution Approach 1:
The coupling system is divided into two independent sealing mechanisms: a first sealing element in a groove for initial sealing, and a second sealing element at the axial interface for final sealing. This segmentation allows each sealing element to perform its function at different stages of coupling, reducing the force required at each stage while maintaining reliable sealing.
Solution Approach 2:
The first sealing element is positioned in a groove to provide preliminary sealing before the bayonet pin fully engages the bayonet slot. This preliminary sealing action occurs during the rotational movement phase, separating the sealing function from the final locking phase and reducing the coupling effort needed.
2Reliability
If elastic contact elements are used for sealing, then sealing adaptability is improved, but temperature dependence of material properties causes sealing failures
Solution Approach 1:
Different sealing elements are positioned at different locations with different functional requirements. The first sealing element in the groove operates in a controlled local environment during coupling, while the second sealing element at the axial interface operates in the final sealed state. This local quality differentiation allows each sealing element to be optimized for its specific temperature and pressure conditions.
Solution Approach 2:
The sealing system utilizes parameter changes by employing two sealing elements that operate at different stages of the coupling process, effectively changing the pressure and position parameters. The first sealing element operates at lower pressure during rotation, while the second sealing element operates at higher pressure after axial engagement, adapting to temperature and pressure variations through staged sealing.
3Reliability
If radial sealing surfaces are used, then sealing is achieved, but the sealing mechanism is sensitive to temperature and pressure variations
Solution Approach 1:
The radial sealing function is segmented into two parts: the first sealing element in the groove providing radial sealing during coupling, and the second sealing element at the axial interface providing radial sealing in the final state. This segmentation distributes the sealing function across different locations, improving adaptability to temperature and pressure variations.
Solution Approach 2:
The first sealing element provides preliminary radial sealing in the groove before final axial engagement. This preliminary sealing action ensures that sealing begins early in the coupling process under more favorable temperature and pressure conditions, then the second sealing element reinforces the seal under final operating conditions.
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
The solution provides a reliable and secure coupling with improved sealing properties, reduced temperature dependence, and easier operation, ensuring long-lasting and durable use with reduced costs by sequencing coupling efforts and preserving the sealing element's material integrity.
Implementation Method 1
at least one elastic contact element which is elastically deformable, the first body member and the second body member being adapted and configured to be complementarily coupled together along a longitudinal axis of the filter arrangement with a bayonet connecting device
Implementation Method 2
the first sealing element is configured and adapted to seal the longitudinal fluid conduit by radial cooperation with the first radial sealing surface and with the second radial sealing surface
Implementation Method 3
the bayonet pin is engaged with a forward wall of the circumferential notch of the bayonet slot to lock a longitudinal displacement of the first body member relative to the second body member
Data Source
AI summary
A filter arrangement has a first body member with a first axial front surface and a first radial sealing surface, a second body member with a second axial front surface and a second radial sealing surface, a contact portion and an elastic contact element. The first and second body members complementarily couple together with a connecting device. In a coupled state, the contact portion and the elastic contact element are axially compressed between the first and second axial front surface. The second radial sealing surface has a groove housing a first sealing element. When brought into the coupled state, the first radial sealing surface at least partially covers the groove of the second radial sealing surface before the contact portion and elastic contact element are at least partially axially compressed between the first and second axial front surface. When coupled, the first radial sealing surface completely covering the groove.