High Pressure Pump Fluid-End Inlet Bore Contour
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Solution Overview
Problem
Conventional well-servicing pumps face high fluidic pressure issues at the cross-bore intersection, leading to stress concentration and potential fatigue problems due to the sharp corners and abrupt changes in bore geometry, which can result in reduced operational efficiency and lifespan.
Innovation Solution
The design incorporates a specific contour for the interior wall of the inlet bore, featuring a cylindrical portion, a planar portion, a convex bulge, and a V-shaped groove, which extends around the inlet axis, creating a stress-reducing taper angle and smoothing transitions between the plunger, valve cover, and inlet bores, thereby reducing stress concentrations at the cross-bore intersection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bore geometry with sharp corners and abrupt changes is used, then manufacturing is simpler, but stress concentration occurs at the cross-bore intersection leading to reduced reliability
Solution Approach 1:
The patent applies curvature by replacing sharp corners and abrupt geometric changes with smooth curved transitions at the cross-bore intersection. The contour includes a convex bulge portion and a concave portion that gradually converge radially, eliminating stress concentration points caused by sharp edges while maintaining structural integrity under high fluidic pressure.
Solution Approach 2:
The patent implements local quality by applying the complex contoured geometry specifically at the cross-bore intersection area where stress concentration occurs, while the rest of the bores maintain their standard cylindrical shapes. This localized application of curved transitions addresses the reliability issue at the critical intersection without unnecessarily complicating the entire bore structure.
2Reliability
If smooth transitions and contoured geometry are applied at the cross-bore intersection, then stress concentrations are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The contoured geometry with smooth curved transitions eliminates stress concentration at the cross-bore intersection, improving operational efficiency under high fluidic pressure. The convex and concave portions create gradual radial convergence that distributes stress evenly, preventing fatigue failure while maintaining robust performance.
3Reliability
If the contour includes convex and concave portions with gradual radial convergence, then stress distribution is improved, but the interior wall geometry becomes more complex
Solution Approach 1:
The convex bulge portion and concave portion create smooth curved transitions that distribute stress evenly at the cross-bore intersection. The gradual radial convergence of these contoured portions eliminates sharp corners and stress concentration points, significantly improving fatigue life while the overall shape remains rotationally symmetric about the inlet axis.
Data Source
AI summary
A pump including a housing defining a plurality of inlet bores. A first interior wall is arranged to at least partially define a first of the plurality of inlet bores. The first interior wall has a contour in a cross section taken normal to the plunger axes. The first interior wall is at least partially defined by the revolution of the contour about a first inlet axis that is normal to and intersects a first of the plurality of plunger axes. The contour includes a cylindrical portion arranged parallel to the first inlet axis, a planar portion extending in a direction perpendicular to the first inlet axis and spaced a first distance from the plunger axis, and a convex bulge portion extending from the cylindrical portion and spaced a second distance from the plunger axis. The contour further includes a V-shaped groove portion extending from the convex bulge portion.