Proton-Implanted UHMWPE Dynamic Seal for Reciprocating Pump Wear Reduction
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Solution Overview
Problem
Reciprocating pump dynamic seals, typically made from ultra-high-molecular-weight polyethylene (UHMWPE), have a shorter operational life than the plunger they contact, requiring more frequent replacements and resulting in increased downtime and maintenance costs.
Innovation Solution
A reciprocating pump with a dynamic seal made from a high molecular weight aliphatic polymer in sliding contact with a compression member, where the compression member's surface is implanted with positive ions, such as hydrogen, to enhance the seal's reliability and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dynamic seal made from ultra-high-molecular-weight polyethylene (UHMWPE) is used, then the seal provides adequate lubricity and sealing performance, but the operational life of the seal is shorter than the plunger it contacts
Solution Approach 1:
The patent applies ion implantation (specifically hydrogen or helium ion implantation) to modify the surface properties of the dynamic seal. This changes physical parameters such as surface hardness, friction coefficient, and wear resistance without altering the bulk material properties of the UHMWPE. The ion-implanted surface layer provides enhanced durability while maintaining the self-lubricating characteristics of the base polymer material.
Solution Approach 2:
The patent creates a composite structure where an ion-implanted surface layer is formed on the UHMWPE dynamic seal. This surface layer acts as a composite enhancement that combines the benefits of the base UHMWPE material (lubricity, flexibility) with the enhanced properties of the ion-modified surface (hardness, wear resistance, reduced friction), resulting in a seal that matches or exceeds the plunger service life.
2Reliability
If the dynamic seal is replaced more frequently to match wear rates, then seal reliability is maintained, but downtime and maintenance costs increase
Solution Approach 1:
The ion implantation process is performed as a preliminary treatment during manufacturing or maintenance cycles, creating a durable surface layer that prevents premature wear. This preliminary hardening and lubricity enhancement ensures the seal can operate for extended periods without replacement, aligning its service life with the plunger and reducing the frequency of maintenance interventions.
3Duration of action of moving object
If the compression member surface is treated to reduce wear, then seal life is extended, but the manufacturing process becomes more complex
Solution Approach 1:
The patent replaces traditional mechanical surface treatment methods (such as coating, plating, or mechanical hardening) with ion implantation. This process uses accelerated ions to modify the surface properties directly, eliminating the need for separate coating materials or complex multi-step mechanical treatment processes. The ion implantation can be performed in a single controlled step, simplifying manufacturing while achieving superior surface properties.
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 proton implantation significantly extends the service life of the dynamic seal to match or exceed the plunger's service life, reducing downtime and rebuilding costs by one-third to two-thirds, while also reducing wear and maintaining effective lubricity between the sliding surfaces.
Implementation Method 1
placing the part under vacuum and bombarding at least a portion of the sliding surface with hydrogen ions to produce a proton implanted sliding surface
Data Source
AI summary
A pressure pump may include a reciprocating assembly including a dynamic seal configured to be in sliding contact with a surface. The surface may be implanted with positive ions such as hydrogen ions/protons to provided reduced wear and/or greater service life of the dynamic seal. According to embodiments, a pump may include an ultra-high molecular weight polyethylene dynamic seal may substantially fixed relative to a cylinder wall, and a proton impregnated reciprocating plunger may pump high pressure water or a water based fluid in a system. The pump may exhibit increased dynamic seal life.