Pump Plunger Non-Linear Profile Mitigates Barrel Rubbing
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Solution Overview
Problem
In linearly actuated pumps, the pump plunger elastically deforms and expands during pressurization, leading to rubbing or scuffing with the barrel on the return stroke due to differential deformation, reducing the pump's service life.
Innovation Solution
The pump plunger features a non-linear geometric profile with specific transition sections and shoulder portions, reducing radial expansion mismatch and minimizing contact with the barrel during the return stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump plunger is made with a standard cylindrical geometry, then the manufacturing is simple, but the plunger rubs or scuffs the barrel on the return stroke due to differential elastic deformation, reducing service life
Solution Approach 1:
The plunger geometry is modified locally in specific regions rather than uniformly. The first and second non-cylindrical portions are positioned at specific locations along the plunger body, creating localized geometric variations that compensate for differential deformation in critical areas while maintaining simple cylindrical geometry in other regions.
Solution Approach 2:
The plunger incorporates non-cylindrical portions with curved or tapered geometries instead of straight cylindrical surfaces. These curved geometries are designed to counteract the elastic deformation patterns that occur during pressurization, ensuring better alignment with the barrel throughout the stroke cycle.
2Reliability
If the plunger geometry is modified to reduce rubbing, then the service life is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The complex geometric modifications are concentrated in localized portions of the plunger rather than requiring precision across the entire surface. This allows standard manufacturing tolerances to be applied to most of the plunger body while focusing precision requirements only on the specific non-cylindrical portions that contact or near the barrel.
Solution Approach 2:
The plunger geometry is divided into distinct segments: cylindrical portions for simple manufacturing and non-cylindrical portions for deformation compensation. This segmentation allows different manufacturing processes and tolerance levels to be applied to different segments, reducing overall manufacturing complexity.
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 non-linear geometric profile of the pump plunger mitigates the deformation mismatch, reducing friction and wear, thereby enhancing the service life of the linearly actuated pump.
Implementation Method 1
the pump plunger may also elastically deform resulting in an increased diameter
Implementation Method 2
The non-linear geometric profile of the pump plunger mitigates the deformation mismatch, reducing friction and wear
Data Source
AI summary
A pump plunger is disclosed. The plunger may include a proximal end and a distal end opposite the proximal end. The plunger may also include a body portion extending between the proximal end and a second transition datum, and additionally include a transition section extending between a first transition datum and the second transition datum. The transition section may have a non-linear geometric profile. A first shoulder portion may be positioned adjacent to the transition section that may extend between the second transition datum and a third datum. The third datum may be positioned radially inward of the second transition datum. The plunger may also include a tip portion positioned adjacent to the first shoulder portion that may extend between the third datum and a fourth datum positioned at the distal end. The fourth datum may be positioned radially inward of the third datum.