Fluid End Isolation Ring Structure for Uniform Bore Stress
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Solution Overview
Problem
Existing fluid ends in high-pressure pumps experience uneven material thickness and stress distribution due to the rectilinear shape of the dynamic body, leading to increased likelihood of fluid leakage and reduced wear ring life.
Innovation Solution
Incorporation of isolation gaps in the dynamic body to create uniform thickness and stress distribution, forming concentric isolation rings that maintain a constant radial distance between the bore wall and isolation gap surfaces, thereby reducing stress variations and fluid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the dynamic body has a rectilinear shape, then manufacturing is simplified, but material thickness becomes uneven and stress distribution is non-uniform
Solution Approach 1:
The dynamic body is segmented by introducing isolation gaps that divide the structure into distinct regions. These gaps create uniform material thickness sections while maintaining the overall rectilinear shape for ease of manufacture. The segmentation allows different portions of the dynamic body to have optimized thickness without complicating the overall manufacturing process.
2Ease of manufacture
If the dynamic body has a rectilinear shape, then manufacturing is simplified, but stress distribution becomes non-uniform leading to increased fluid leakage
Solution Approach 1:
The isolation gaps segment the dynamic body structure to create uniform stress distribution zones. By dividing the continuous material into sections separated by gaps, the stress is evenly distributed across each segment, preventing concentration points that would lead to fluid leakage, while the overall rectilinear configuration remains simple to manufacture.
Solution Approach 2:
The isolation gaps act as intermediary elements between different sections of the dynamic body. These gaps mediate the stress distribution by providing uniform spacing and support structures, preventing direct stress concentration that would cause leakage, while maintaining manufacturing simplicity through the regular spaced configuration.
3Ease of manufacture
If material thickness is non-uniform, then manufacturing is easier, but wear ring life is reduced due to uneven stress distribution
Solution Approach 1:
The dynamic body is segmented by isolation gaps to create uniform material thickness sections. This segmentation ensures that wear rings experience consistent stress distribution across their mounting surfaces, extending their operational life, while the segmented rectilinear structure remains simple to manufacture using standard fabrication processes.
Data Source
AI summary
A dynamic section of a fluid end. The dynamic section has a through-bore which is surrounded by an isolation ring of constant thickness. The isolation ring is separated from the remainder of the dynamic section body by an isolation gap, which is a groove cut into the dynamic section body. The use of such an isolation ring prevents transmission of, and reception of, uneven forces which might tend to stress or damage wear elements and seals disposed within the through-bore. The isolation ring may be used on each side of the through-bore at the surface, and the isolation gap separating the isolation ring from the rest of the dynamic section may be deeper than the section of the through-bore containing the wear rings and seals.