Rolling Elastomer Mechanical Seal for Abrasive Slurry Service

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional mechanical seals struggle to effectively seal slurry-type process fluids, leading to degradation and increased maintenance costs due to abrasive particles, which require frequent repair and replacement.

Innovation Solution

A mechanical seal assembly featuring axially adjacent annular seal ring elements with a rolling spring-type elastomeric sealing element providing axial preloading and protection from abrasive environments, along with a cover sealing element and energizer sealing element to maintain a fluid seal and prevent damage from slurry particles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional mechanical seals are used to seal slurry-type process fluids, then the seal provides initial fluid-tight sealing, but the seal components degrade over time due to abrasive particles

Engineering Contradiction:

Improveseal performanceVSAvoidservice life

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The mechanical seal employs composite material construction where the stationary seal ring is made from an elastomeric material that combines flexibility with abrasion resistance. This composite approach allows the seal to maintain reliability in slurry service by using materials specifically selected for their resistance to abrasive particle damage while maintaining sealing effectiveness.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention changes the material parameters of the stationary seal ring by using elastomeric materials with specific durometer ratings and abrasion resistance properties. This parameter change enables the seal to withstand the harsh slurry environment while maintaining sealing performance, directly addressing the degradation issue caused by abrasive particles.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If the mechanical seal is designed with fixed axial positioning, then the seal structure is simplified, but the seal cannot accommodate shaft axial movement without disassembly

Engineering Contradiction:

Improveseal structureVSAvoidaxial adjustment capability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The stationary seal ring is designed with dynamic positioning capability through an elastomeric material that can deform and adapt to axial movements. This allows the seal to accommodate shaft axial movement without requiring disassembly or complex adjustment mechanisms, resolving the contradiction between structural simplicity and adaptability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The elastomeric stationary seal ring acts as a flexible element that can deform to accommodate axial movements of the shaft. This flexible design allows the seal to maintain its sealing function while adapting to dimensional changes, eliminating the need for complex adjustment mechanisms.

Inventive Principle:

Principle #30Flexible shells and thin films

3Productivity

If the seal components are exposed to the slurry environment, then the seal can perform its sealing function, but the abrasive particles cause degradation and require frequent maintenance

Engineering Contradiction:

Improvesealing functionVSAvoidabrasive particle damage

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The stationary seal ring uses composite material construction with elastomeric materials specifically selected for their resistance to abrasive particle damage. This material selection allows the seal to perform its sealing function while resisting degradation from the slurry environment, reducing maintenance requirements.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The elastomeric stationary seal ring is designed as a consumable component that can be easily replaced when worn. This approach uses a relatively simple, inexpensive material that provides adequate service life and can be economically replaced rather than repaired, reducing overall maintenance costs and downtime.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 mechanical seal assembly allows for large axial adjustments without disassembly, effectively seals slurry-type process fluids, reduces maintenance costs, and prolongs the lifespan of seal components by protecting them from abrasive particles.

Implementation Method 1

an elastomeric sealing element, such as an axially rolling spring type sealing element having a flex region to provide an axial preloading or biasing force between the seal faces

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

axially rolling spring type sealing element having a flex region to provide an axial preloading or biasing force

Methodology Applied

Scientific EffectSpring: Spring

Data Source

PatentUS12000489B2Elastomer spring type mechanical seal

Publication Date: 2024.06.04 CHESTERTON AW CO

AI summary

A mechanical seal assembly having a gland assembly, a rotary seal ring, a stationary seal ring, a sleeve assembly having a flange portion for mounting the rotary seal ring, a cover sealing element for seating over the flange portion and contacting a portion of the rotary seal ring, and an energizer sealing element axially spaced from the cover sealing element for sealing a portion of the stationary seal ring and the gland assembly and for providing an axial biasing force to the stationary seal ring.