Variable-Diameter Valve Bores for Fluid End Tie Rod Clearance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fluid ends for high pressure reciprocating pumps require significant machining and raw material to create a flange for tie rod attachment, limiting compatibility and increasing manufacturing costs.
Innovation Solution
The fluid end casing design incorporates variable diameter bores and through holes to accommodate tie rods without intersecting the valve seat bores, allowing for an industry-standard tie rod pattern, reducing machining and material requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flange is machined into the fluid end to catch tie rods, then the tie rods can be properly positioned and secured, but the machining cost and raw material requirements increase significantly
Solution Approach 1:
The patent extracts the tie rod catching function from a separate flange structure and integrates it directly into the fluid end body through precisely positioned through-bores. This eliminates the need for a distinct flange component and its associated machining operations, while maintaining reliable tie rod positioning and securing capability.
Solution Approach 2:
The fluid end body is designed to serve multiple functions: it contains the hydraulic fluid chambers, provides mounting surfaces, and directly secures the tie rods through integrated through-bores. This multi-functional design eliminates the need for separate flange structures, reducing both manufacturing complexity and material requirements.
2Volume of moving object
If the tie rod spacing is reduced to minimize fluid end size, then the overall pump size decreases, but the tie rods would intersect with the valve seat bores
Solution Approach 1:
The patent applies local quality by creating variable diameter sections within the bores. The bores have larger diameter portions where tie rods pass through and smaller diameter portions for valve seat installation, allowing close tie rod spacing without interference while maintaining proper valve seat positioning and function.
Solution Approach 2:
The patent resolves the spatial conflict by varying the bore diameter along its length rather than maintaining a uniform diameter. This dimensional change allows the bore to accommodate both the tie rod passage and the valve seat mounting area within a compact overall structure, enabling reduced fluid end size without component interference.
3Object-generated harmful factors
If variable diameter bores are used to accommodate both tie rods and valve seats, then component interference is avoided, but the manufacturing complexity increases
Solution Approach 1:
The patent changes the geometric parameters of the bores by creating variable diameter sections. The bores transition between larger diameter portions for tie rod passage and smaller diameter portions for valve seat mounting, allowing both components to coexist without interference while maintaining a relatively simple overall structure that can be manufactured using standard machining processes.
Data Source
AI summary
A relationship between tie rods and a valve seat bore in a fluid end. The profile of the valve seat bores are changed to allow the tie rods to pass through the fluid end without intersecting or intercepting the internal bore geometry, while still being compatible with industry standard internal components. A relationship between a plunger bore diameter and a flow area of a valve seat in a fluid end is used to identify acceptable fluid end casing designs that can be used with industry standard couplers, such as tie rods.