Air-Dryer Cartridge Thread With Reversed Load Flank
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Solution Overview
Problem
Conventional threaded connections in filter cartridges are prone to ripping out due to high internal pressures or overpressure, leading to premature wear and reduced lifespan, especially in applications like air-drier cartridges in trucks where pulsating pressures cause thread fatigue.
Innovation Solution
A threaded connection design with a reversed load flank angle, increasing cohesion force proportionally with the applied ripping force, ensuring the cartridge remains securely attached to its base by enhancing the surface contact area under pressure, thereby resisting disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional metric ISO standard threads are used for manual tightening, then ease of operation is improved, but reliability deteriorates due to susceptibility to ripping out under high pressure
Solution Approach 1:
The patent inverts the conventional thread load flank orientation. Instead of the load flank facing forward (standard ISO thread), the load flank is oriented rearward relative to the screwing direction. This inversion causes the thread to self-tighten under pressure by converting the ripping force into a tightening force, thereby improving reliability while maintaining ease of manual operation
Solution Approach 2:
The patent converts the harmful ripping out force into a beneficial self-tightening mechanism. The internal pressure that would normally cause the cartridge to rip out is instead utilized to increase the contact surface area and cohesion force of the reversed load flank threads, transforming the harmful pressure into a force that strengthens the connection
2Ease of manufacture
If conventional threads are used, then ease of manufacture is improved, but duration of action deteriorates due to thread fatigue from pulsating pressure
Solution Approach 1:
By inverting the load flank orientation, the thread connection transforms pulsating pressure from a fatigue-inducing force into a self-tightening force. Each pressure cycle increases the contact surface area and cohesion, preventing thread loosening and fatigue, thereby extending cartridge lifespan while maintaining compatibility with standard manufacturing processes
Solution Approach 2:
The reversed load flank thread connection performs self-service by automatically adjusting and tightening itself in response to pressure variations. The thread structure autonomously compensates for pulsating pressure without external intervention, reducing wear and extending the operational life of the cartridge
3Reliability
If the thread is designed to resist high ripping out forces, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent achieves enhanced reliability through a simple geometric inversion of the load flank orientation rather than through complex additional components or mechanisms. The reversed load flank thread maintains the basic threaded connection structure while changing the angle orientation, thereby improving connection security without significantly increasing device complexity
Data Source
Figure 1~2
Figure 3
AI summary
The present invention is directed to a thread connection between a filter cartridge (1) and its base (2), as well as to a filter cartridge (1) comprising such a thread. The thread object of the present invention is characterized in having a reversed load flank (13,23).