Tapered Groove Spring Retainer for High Pressure Plunger Pump
Solution Overview
Problem
High pressure plunger pumps face challenges in preventing the movement of spring retainers along the long axis of suction and discharge bores, leading to potential fatigue and reduced volumetric efficiency due to inadequate stress relief and retention mechanisms.
Innovation Solution
A tapered groove configuration in the plunger pump fluid end, combined with a spring retainer design featuring angled surfaces and a base portion, prevents the retainer from rotating or moving out of the groove by utilizing transition areas and angled surfaces to inhibit axial movement and rotation, ensuring secure retention within the groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional spring retainers are used in high pressure plunger pumps, then the pump can operate, but the retainer may move along the long axis of suction and discharge bores causing fatigue and reduced volumetric efficiency
Solution Approach 1:
The groove configuration transitions from a simple linear retention path to a three-dimensional tapered structure with angled surfaces. The groove has a base portion and two angled surfaces that converge toward the discharge bore, creating a dimensional constraint that prevents axial movement along the suction bore while accommodating the spring retainer in a stabilized position.
Solution Approach 2:
The groove is designed with asymmetric geometry where the two angled surfaces have different orientations relative to the suction and discharge bores. This asymmetric configuration creates differential constraints that specifically prevent movement along the suction bore axis while allowing proper spring compression and valve operation.
2Productivity
If the groove is designed to prevent retainer movement, then volumetric efficiency is maintained, but the groove configuration becomes more complex
Solution Approach 1:
The groove configuration provides localized stress relief and retention precisely at the critical cross-bore intersection area where the suction and discharge bores meet the plunger bore. This localized geometric feature concentrates stress management and retention functionality at the specific location where it is most needed, rather than requiring complex features throughout the entire pump housing.
3Reliability
If threaded retainers are used to secure spring retainers, then retention is achieved, but stress concentration increases leading to fatigue failure
Solution Approach 1:
The invention extracts and eliminates the threaded retainer component entirely, replacing it with an integrated tapered groove configuration that provides retention through geometric constraint rather than mechanical fastening. This removes the stress concentration points associated with threaded connections while maintaining secure retainer positioning.
Solution Approach 2:
The tapered groove acts as an intermediary structural feature between the pump housing and the spring retainer, providing stress distribution and retention without requiring direct threaded engagement. The groove geometry mediates the interaction between components, distributing stresses more evenly across the housing structure.
Data Source
AI summary
A fluid end of a pump includes a casing defining a plurality of working spaces that each include an inlet bore, an outlet bore, a plunger bore, and a valve cover bore. The bores define a cross bore intersection space, and an inlet bore transition area at the intersection of the inlet bore and the cross bore intersection space. A first V-shaped groove and a second V-shaped groove are formed adjacent the inlet bore transition area with each extending partially around the inlet bore axis. An inlet spring retainer includes first and second engagement portions and is orientable in a first orientation in which the retainer is movable from the inlet bore to the plunger bore and a second orientation in which the retainer engages the first and second V-shaped grooves to inhibit movement of the retainer from the inlet bore to the cross bore intersection space.