Fluid End Clamp Retention With Single Seal for Wear Control
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Solution Overview
Problem
Traditional fluid end assemblies in high-pressure reciprocating pumps face issues with leakage and component wear due to the use of multiple packing seals and metal rings, leading to erosion and maintenance challenges, especially under high pressures encountered in oil and gas operations.
Innovation Solution
A fluid end assembly design featuring a single multi-contact V-nested spring seal with an energizing component that expands radially for sealing, combined with a wear ring made of hardened material to reduce wear on the housing, and a clamp system that secures the retainer without internal threads, enhancing sealing efficiency and reducing maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple packing seals and metal rings are used in traditional fluid end assemblies, then sealing coverage is improved, but component wear and erosion increase
Solution Approach 1:
The patent combines multiple separate sealing components (packing seals and metal rings) into a single integrated V-nested spring seal assembly. This unified design maintains comprehensive sealing coverage while reducing the number of discrete components that can wear and erode, directly resolving the contradiction between sealing efficiency and component wear.
Solution Approach 2:
The V-nested spring seal assembly incorporates multiple materials with different properties - the spring component provides elastic recovery and the seal elements provide sealing contact. This composite approach maintains effective sealing under high pressure while distributing wear across different material zones, reducing overall component erosion.
2Reliability
If traditional packing seal assemblies are used, then sealing function is achieved, but maintenance complexity increases
Solution Approach 1:
The seal assembly is designed as a segmented, modular unit that can be installed and replaced as a single assembly. The V-nested spring components are pre-assembled in a standardized configuration, allowing the entire sealing system to be replaced without disassembling individual components, significantly reducing maintenance complexity while maintaining sealing function.
Solution Approach 2:
The standardized V-nested spring seal assembly design creates a universal component that can be applied across different fluid end assemblies. This multi-functional design allows the same seal assembly to serve both sealing and wear protection functions, simplifying maintenance procedures and reducing the need for specialized repair knowledge.
3Strength
If threaded retainers are used to secure the retainer, then secure attachment is achieved, but housing erosion increases
Solution Approach 1:
The patent removes the threaded fasteners and internal threads from the housing structure. Instead, the retainer is secured through a clamp-on mechanism that attaches to external features of the housing. This extraction of threading elements eliminates the primary source of housing erosion while maintaining secure attachment through alternative mechanical means.
Solution Approach 2:
The retainer incorporates an intermediate mounting structure that serves as a mediator between the housing and the seal assembly. This intermediate component distributes attachment forces away from the housing bore surface, preventing direct contact and erosion while maintaining secure attachment. The clamp mechanism acts as an intermediary that secures the retainer without requiring threads in the housing.
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 design significantly reduces wear on the housing, improves sealing efficiency, and simplifies maintenance by minimizing the surface area susceptible to wear, thereby extending the life of components and maintaining effective sealing under high pressures.
Implementation Method 1
a single multi-contact V-nested spring seal with an energizing component that expands radially for sealing
Implementation Method 2
a wear ring made of hardened material to reduce wear on the housing
Data Source
AI summary
A fluid end assembly comprising a plurality of fluid end sections positioned in a side-by-side relationship. Each section comprises a housing containing a reciprocating plunger. One and only one packing seal is installed within the housing and surrounds and engages an outer surface of the plunger. A retainer compresses and holds the packing seal within the housing. The retainer is secured to the housing using a clamp, such that no threads are formed in the housing of the fluid end section and no threads are formed in the retainer.