Mechanical Seal Rim Structure for Slurry Impurity Control
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Solution Overview
Problem
Existing mechanical sealing devices for rotating equipment are prone to wear and damage due to impurities in slurry liquids, leading to leakage and reduced service life, necessitating frequent replacements and increased water usage.
Innovation Solution
A mechanical sealing device with a peripheral rim featuring an inclined surface that agitates the liquid medium, creating a turbulent flow to prevent impurities from accumulating at the sealing interface, and includes a peripheral rim integrated with rotating or stationary rings to enhance heat dissipation and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the peripheral surface of the rotating ring is set to be flush with that of the stationary ring for forming an end of the sealing interface that is in contact with the liquid, then impurity accumulation at the sealing interface is avoided, but the manufacturing complexity increases
Solution Approach 1:
The patent introduces a peripheral rim that extends beyond the sealing interface in the radial dimension. This rim creates a turbulent flow zone that redirects impurities away from the sealing interface, solving the problem of impurity accumulation without requiring complex modifications to the sealing surfaces themselves.
Solution Approach 2:
The peripheral rim acts as an intermediary structure between the liquid flow and the sealing interface. It mediates the interaction by creating turbulence and centrifugal effects that prevent impurities from reaching the sealing contact area, thus protecting the seal without direct modification of the sealing surfaces.
2Loss of energy
If one of the rotating and stationary rings is shortened in diameter for forming the other end of the sealing interface that is in contact with air, then friction is reduced, but the service life is shortened
Solution Approach 1:
The patent divides the ring structure into two functional zones: the sealing interface area (for sealing) and the peripheral rim area (for flow control). This segmentation allows the sealing surfaces to maintain full diameter for durability while the peripheral rim extends beyond to create turbulence, effectively separating the friction-reduction function from the service-life-critical sealing surfaces.
3Duration of action of moving object
If a peripheral rim with an inclined surface is added to agitate the liquid medium and move impurities away from the sealing interface, then the service life is prolonged, but the device complexity increases
Solution Approach 1:
The patent merges the peripheral rim with the existing rotating or stationary ring structure. The rim is integrated as an extension of the ring, combining the sealing function with the flow agitation function in a single unified component, thereby reducing overall device complexity while achieving both sealing and impurity removal objectives.
4Reliability
If the mechanical sealing device is frequently replaced due to wear and damage, then leakage is prevented, but water consumption increases
Solution Approach 1:
The peripheral rim creates a self-cleaning effect by generating turbulent flow that continuously flushes impurities away from the sealing interface. This self-service mechanism reduces wear and extends service life without requiring external rinsing water, thereby preventing leakage while minimizing water consumption.
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 device effectively prevents impurity accumulation, prolongs the service life of the sealing device, and enhances sealing performance while reducing manufacturing complexity and water consumption.
Implementation Method 1
the peripheral rim contributes to a turbulent flow of the liquid, and impurities in the liquid are induced to move away from the sealing interface along the inclined surface due to a centrifugal force
Implementation Method 2
impurities in the liquid are induced to move away from the sealing interface along the inclined surface due to a centrifugal force
Data Source
AI summary
A mechanical sealing device for sealing fluid from escaping a housing through which a rotating shaft is arranged includes a rotatable ring fixed to and disposed about the rotating shaft. A stationary ring is disposed about the rotating shaft, and abuts a stationary ring at a contact point. A peripheral rim is provided and surrounds the rotatable ring and the stationary ring. The peripheral rim defines an inclined surface exposed to the fluid and includes a distal end that protrudes radially beyond the rotatable ring and the stationary ring. One of either the rotatable or stationary rings includes an inclined chamfer adjacent the contact point, the inclined chamfer defining a plane that is parallel to the inclined surface.