Ceramic Plug Head Retention via Differential Expansion

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Solution Overview

Problem

In extreme operating environments, such as high temperatures and corrosive or abrasive fluids, ceramic plug heads in valve assemblies tend to weaken or become loosely coupled due to differential expansion of materials, leading to potential fractures and compromised integrity.

Innovation Solution

A plug head assembly design featuring a ceramic plug head with an annular retention groove, coupled with a metal annular retention sleeve and clamp portions that expand at different rates to maintain retention, along with a gasket and annular retention ring that exert compressive forces to secure the ceramic plug head, ensuring durability and resistance to erosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a conventional retainer apparatus is used to retain a ceramic plug head, then the assembly is simpler to manufacture, but the retainer apparatus expands at a higher rate than the ceramic plug head at elevated temperatures, making the fit loose and compromising integrity

Engineering Contradiction:

Improvesimplicity of retainer apparatusVSAvoidintegrity of ceramic plug head retention

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the physical parameters of the retention system by introducing an expansion gap that allows differential thermal expansion. The retention apparatus is designed with specific clearance dimensions that accommodate the higher thermal expansion coefficient of metal compared to ceramic, maintaining proper fit across temperature ranges without requiring complex compensation mechanisms

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces an intermediary retention mechanism where the retention apparatus does not directly contact the ceramic plug head with fixed constraints. Instead, it provides a controlled environment with expansion gaps that mediate the thermal expansion differences, allowing both components to expand freely while maintaining retention integrity

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If a ceramic plug head is retained by a conventional retainer apparatus, then the structure is simpler, but thermal events and crushing lodged solids cause fractures in the ceramic plug head, leading to separation or compromised integrity

Engineering Contradiction:

Improvestructure of retention systemVSAvoidintegrity of ceramic plug head

Core Design Contradiction:

Device complexityVSStrength

Solution Approach 1:

The patent applies preliminary anti-action by designing the retention apparatus to preemptively protect the ceramic plug head from fracture-causing forces. The expansion gaps and retained structure prevent concentrated stress buildup that would lead to cracking under thermal or mechanical loads, addressing the fracture problem before it occurs

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent implements beforehand cushioning by creating a retention structure that absorbs and distributes mechanical and thermal stresses before they can cause ceramic fracture. The design includes compliance elements and expansion spaces that cushion the ceramic plug head against sudden temperature changes and crushing forces from lodged solids

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Temperature

If materials in the plug head assembly expand at different rates due to differential thermal expansion, then the assembly can accommodate thermal changes, but the fit between components becomes loose, compromising retention

Engineering Contradiction:

Improvethermal expansion accommodationVSAvoidfit between retainer apparatus and ceramic plug head

Core Design Contradiction:

TemperatureVSStability of the object's composition

Solution Approach 1:

The patent changes the dimensional parameters of the retention system to account for thermal expansion. Specific clearance values and gap dimensions are designed to maintain optimal fit across the operating temperature range, transforming the thermal expansion challenge into a controlled geometric relationship

Inventive Principle:

Principle #35Parameter changes

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 effectively retains the ceramic plug head in high-temperature and high-pressure environments, preventing fractures and maintaining assembly integrity by leveraging differential expansion for compressive forces, while also reducing erosion and particle entrapment.

Implementation Method 1

the retainer apparatus may expand at a higher rate than the ceramic plug head, thus making the fit between the retainer apparatus and the ceramic plug head loose

Methodology Applied

Scientific EffectDifferential thermal expansion: Thermal Expansion

Data Source

PatentUS10851913B2Systems and methods for a plug head assembly

Publication Date: 2020.12.01 CALDERA ENGINEERING LLC

AI summary

A plug head assembly having a ceramic plug head having an annular retention groove, wherein the ceramic plug head has a proximal terminus and a distal terminus, a first clamp portion having a first annular retention protrusion conforming to the annular retention groove, a second clamp portion having a second annular retention protrusion conforming to the annular retention groove, and an annular retention sleeve conforming to the annular retention groove, the annular retention sleeve disposed between the annular retention groove and at least one of the first clamp portion and the second clamp portion.