V-Shaped Piston Sealing Lip with Radial Ribs for Centering
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Solution Overview
Problem
Conventional sealing pistons with backward-facing sealing lips are insufficient under high ejection pressures, leading to incomplete seals and material film stagnation, while forward-pointing sealing lips complicate piston insertion and risk damage, potentially causing imperfect sealing and material loss.
Innovation Solution
A piston design featuring a curved piston plate with a V-shaped transition region forming an obliquely forward-pointing sealing lip, equipped with radial ribs on the inside for centering and insertion aid, ensuring proper alignment and preventing damage during insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a forward-pointing sealing lip is provided on the piston, then sealing performance under high ejection pressure is improved, but insertion of the piston into the cartridge becomes more difficult and risk of damage increases
Solution Approach 1:
The sealing lip is divided into multiple segments by introducing radial grooves that extend from the cartridge wall toward the piston axis. These grooves create separate sealing segments that can independently deform and adapt during insertion, allowing the sealing lip to flex and clear minor obstacles or misalignments while maintaining sealing contact with the cartridge wall.
Solution Approach 2:
The radial grooves change the physical state of the sealing lip by creating flexible segments that can undergo elastic deformation. This parameter change allows the sealing lip to transition from a rigid structure to a more compliant structure during insertion, enabling it to navigate the insertion process more easily while maintaining sealing effectiveness under high pressure.
2Ease of operation
If conventional backward-facing sealing lips are used, then insertion is easier, but sealing performance under high ejection pressure deteriorates leading to material film stagnation
Solution Approach 1:
The sealing lip is segmented by radial grooves that create independent sealing zones. Each segment can independently respond to pressure differentials, ensuring that the sealing function is maintained even when parts of the sealing lip are subjected to high ejection pressures, preventing material film stagnation between the piston and cartridge wall.
Solution Approach 2:
The radial grooves enable the sealing lip to dynamically adapt its shape during operation. Under high ejection pressure, the sealing lip segments can deform to maintain contact with the cartridge wall, transitioning from a static sealing structure to a dynamic one that responds to pressure changes, thereby preventing material film formation.
3Ease of operation
If the sealing lip is made more compliant to improve insertion, then sealing performance under high pressure may deteriorate
Solution Approach 1:
The sealing lip is divided into multiple rigid segments by radial grooves rather than making the entire lip compliant. Each segment maintains structural integrity and rigidity for reliable sealing under high pressure, while the gaps between segments allow flexible movement and adaptation during insertion, achieving both insertion ease and sealing reliability.
Solution Approach 2:
The sealing lip structure combines rigid material properties with a segmented geometry created by radial grooves. This composite approach maintains the inherent rigidity of the sealing lip material for high-pressure sealing while the segmented structure provides flexibility during insertion, avoiding the need to compromise material properties.
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 rib arrangement facilitates automatic centering and insertion of the piston, preventing damage and ensuring a reliable seal by maintaining elastic mobility and suppleness of the sealing lip, even under off-center insertion or cartridge irregularities.
Implementation Method 1
piston made of elastic plastic... elastic sealing lip 5 is not impeded in its elastic mobility
Data Source
Figure 1a~1c
Figure 2a~2c
AI summary
The piston has a transition region (4) formed between a piston plate (1) and a cylindrical apron (2) with V-shaped cross-section. A sealing lip (5) is formed at circumference, and diagonally points in forward and outward directions. The sealing lip comprises small radial ribs (6) distributed over the circumference at inner side that is turned toward a piston axis. The ribs are arranged over the sealing lip in the forward direction and form a radially outward pointing and diagonally backward running ramp surface (7) that projects into a forward edge surface (8) of the sealing lip.