Desiccant Container Pretension Device for Air Dryer Cartridges
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Solution Overview
Problem
Conventional desiccant containers for air dryer cartridges in vehicles require a large number of components and high mechanical stress due to the need for extensive pretensioning of desiccant beads, which leads to increased wear and friction, resulting in volume loss over time.
Innovation Solution
A desiccant container with a pretension device that utilizes a smaller pretension area and quasi-fluid properties of desiccant beads to distribute pretension forces efficiently, reducing mechanical stress and component count, and incorporating guiding members for precise axial guidance of the pretension piston.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pretension devices use a large contact surface to pretension all desiccant beads, then complete pretension coverage is achieved, but mechanical stress and component count increase
Solution Approach 1:
The patent applies local quality by concentrating the pretension force on a specific local area (the annular space between guide members) rather than distributing it uniformly across the entire desiccant bed. The pretension piston with its lateral wall creates a focused pretension zone that efficiently compacts the desiccant beads in the critical area where moisture separation occurs, while avoiding the need to pretension the entire desiccant volume. This localized approach reduces mechanical stress on components while maintaining effective pretension coverage.
2Reliability
If conventional pretension devices apply high spring force to push the entire desiccant cover downwards, then adequate pretension is achieved, but mechanical stress in affected parts increases
Solution Approach 1:
The patent reduces mechanical stress by localizing the pretension force application. Instead of requiring high spring force to push the entire desiccant cover downward, the spring force is concentrated on the pretension piston's lateral wall, which creates friction against the desiccant beads in the annular space. This localized friction-based pretensioning achieves adequate compaction with lower overall spring force, reducing mechanical stress on the housing and other components.
Solution Approach 2:
The patent substitutes direct mechanical pushing with a friction-based mechanism. Rather than the spring directly pushing the desiccant cover downward with high force, the pretension piston's lateral wall creates friction against the desiccant beads as it rotates or moves axially. This friction-based pretensioning is more efficient and requires lower mechanical force, reducing stress on the system components.
3Device complexity
If desiccant beads are pretensioned in one direction only, then the pretension device structure is simple, but wear and friction cause volume loss over time
Solution Approach 1:
The patent introduces dynamics by enabling the pretension piston to rotate in addition to its axial movement. This rotational motion, combined with axial displacement, creates a dynamic pretensioning action that compacts the desiccant beads in multiple directions over time. The rotation causes the lateral wall to engage different portions of the desiccant bed sequentially, providing multi-directional pretensioning that counteracts wear and friction effects, thereby improving desiccant stability without significantly complicating the device structure.
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 more stable, space-efficient, and mechanically stable desiccant container with reduced wear and friction, allowing for effective pretensioning of desiccant beads with lower mechanical tension and maintaining performance throughout the desiccant's lifetime.
Implementation Method 1
The pretension device (20) comprises a spring (20c) for pushing the pretension piston (20b) axially
Implementation Method 2
In operation, the pretension piston is axially pushed by the spring and rotated in the accommodation volume by friction between a lateral wall of the pretension piston and the desiccant
Data Source
Figure 1
AI summary
The present invention relates to a desiccant container (10) for an air dryer cartridge (12) for a vehicle, especially utility vehicle, with at least one housing (14); with at least one accommodation volume (16) for accommodating at least one desiccant (18) comprising a plurality of desiccant beads, wherein the desiccant container (10) comprises at least one container cover (14a); and with at least one pretension device (20) supported at the container cover (14a), wherein the pretension device (20) comprises at least one pretension area (20a) for pretension, in a mounted state, at least one first part of the desiccant beads according to a first pretension direction (D1) and for pretension at least one second part of the desiccant beads according to a second pretension direction (D2) being opposite so the first pretension direction. The present invention further relates to an air dryer cartridge for an air treatment device for a vehicle, especially utility vehicle, with at least one desiccant container (10) as mentioned above and relates to an air treatment device for a vehicle, especially utility vehicle, with at least one desiccant container (10) and with at least one air dryer cartridge as mentioned above, respectively.