Piston Guide Rings for Coaxial Alignment and Sealing
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Solution Overview
Problem
Piston pumps face issues with non-coaxial alignment of the piston and chamber, leading to problems such as loss of dosage, failure to prime, and leakage due to inadequate sealing between the piston and chamber surfaces.
Innovation Solution
The introduction of radially extending locating discs on the piston, which engage the chamber wall and have axial openings for fluid flow, helps maintain the piston coaxially within the chamber, assisted by flexing discs for resilient engagement and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the piston is allowed to slide freely in the chamber, then the ease of operation is improved, but the coaxial alignment deteriorates leading to sealing failures
Solution Approach 1:
The patent introduces locating discs as intermediary elements between the piston and chamber wall. These discs have peripheral portions that engage the chamber wall to maintain coaxial alignment, while their central openings allow fluid passage. This mediator structure enables the piston to slide freely without direct contact that would restrict motion, yet maintains precise coaxial positioning through the locating discs' engagement with the chamber wall.
2Manufacturing precision
If locating discs are added to maintain coaxial alignment, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The locating discs are designed to perform multiple functions simultaneously: they maintain coaxial alignment through peripheral engagement with the chamber wall, allow fluid passage through central openings, and provide sealing surfaces for flexing discs. By consolidating alignment, fluid flow, and sealing functions into a single component, the overall device complexity is minimized while achieving the desired coaxial alignment precision.
3Reliability
If flexing discs are used for sealing engagement, then the reliability of sealing is improved, but the device complexity increases
Solution Approach 1:
The patent employs flexing discs made of elastomeric material as thin flexible membranes for sealing engagement. These flexing discs are attached to the piston and resiliently engage the chamber wall to form fluid-tight seals. The flexible nature of these thin film elements allows them to adapt to slight misalignments and maintain reliable sealing without requiring complex mechanical sealing structures.
4Reliability
If the piston and chamber are required to maintain sealing engagement, then the reliability is improved, but the ease of operation deteriorates due to friction
Solution Approach 1:
The patent implements local quality by providing sealing engagement only at specific locations through flexing discs attached to the piston, rather than requiring continuous contact between the entire piston surface and chamber wall. The locating discs provide localized engagement points for maintaining alignment, while the flexing discs provide localized sealing zones. This localized approach maintains reliable sealing where needed while minimizing friction and resistance to piston sliding in other areas.
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 solution enhances the coaxial alignment and sealing of the piston within the chamber, preventing fluid leakage and ensuring effective pumping operations by maintaining the piston centered and aligned, thereby improving the overall performance of the pump.
Implementation Method 1
a first seal disc extending radially outwardly from the stem proximate the inner end, the first seal disc having an elastically deformable edge portion proximate the chamber wall circumferentially thereabout, wherein in operation: (a) on the piston-forming element sliding outwardly in said chamber, the first seal disc substantially preventing fluid flow past the first seal disc in an inward direction, and (b) on the piston-forming element sliding inwardly into the chamber the first seal disc elastically deforms away from the chamber wall to permit fluid flow past the first seal disc in an outward direction
Data Source
AI summary
In a piston pump, the improvement of providing a locating disc on the piston extending radially outwardly from the piston to engage a chamber wall of the piston chamber and with the locating disc having an opening axially therethrough permitting fluid flow both in an inward direction and an outward direction.