Rotating Casing Seal Structure for Abrasive Particle Exclusion
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Solution Overview
Problem
Existing sealing solutions for rotating machines in extreme environments, such as hydraulic machines exposed to chemicals, debris, and abrasive particles, face reliability issues due to contamination and corrosion, leading to reduced lifespan.
Innovation Solution
A sealing device comprising a first and second casing segment with an axial seal system, including metal and elastomer rings, and a conduit with radial portions and ribs forming baffles to prevent particle ingress and facilitate evacuation, along with an inclined plane to scrape off deposited materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If seals are concealed at the bottom of a recess to protect them from contamination, then the seal is protected from external contaminants, but fine particles can accumulate in the recess and continuously reach the seal during rotation
Solution Approach 1:
The recess is segmented into multiple zones: an upper reception zone that captures particles, a middle evacuation zone with openings that allows particle escape, and a lower seal protection zone. This segmentation prevents particle accumulation near the seal while maintaining protective coverage.
Solution Approach 2:
The inclined plane acts as an intermediary element between the external environment and the seal. It intercepts and redirects particles away from the seal area, preventing direct contact between contaminants and the sealing element.
2Object-affected harmful factors
If a recess structure is used to conceal the seal, then the seal is shielded from direct exposure to contaminants, but the recess fills with abrasive particles that rotate with the machine
Solution Approach 1:
The harmful function of particle accumulation is extracted from the system by providing escape paths through openings in the recess walls. Particles are taken out of the confined space before they can cause damage to the seal.
Solution Approach 2:
The recess structure incorporates dynamic elements including the rotation of the inclined plane that actively sweeps particles, and the openings that allow dynamic particle escape during machine operation, transforming a static trapping structure into a dynamic particle management system.
3Duration of action of stationary object
If the seal is protected from contamination, then the machine's lifespan is extended, but the sealing structure becomes more complex
Solution Approach 1:
Multiple functions are merged into the recess structure: particle reception, particle evacuation through openings, and seal protection. The inclined plane simultaneously serves as a protective barrier and an active particle-sweeping element, reducing the need for separate components.
Solution Approach 2:
The recess structure performs multiple functions: it conceals the seal from direct exposure, provides a reception zone for particles, offers escape paths for particle removal, and the inclined plane actively sweeps particles away. This multi-functionality achieves comprehensive protection without requiring multiple separate systems.
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
Enhances the reliability and longevity of the seal by protecting it from contamination and corrosion, effectively removing abrasive particles and debris, and ensuring a tight seal even in harsh conditions.
Implementation Method 1
a plane configured so that, during the rotation of the hydraulic machine, it sweeps a portion of the cylinder located radially around external openings in the housing
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A casing (1) for a rotating machine, comprising a first segment (12) which is fixed and a second segment (14) which rotates about an axis of rotation (X-X), the first segment (12) and the second segment (14) being in contact along an interface provided with a sealing element (40), said sealing element (40) being positioned in a housing (30) connected to the internal volume of the casing on one hand and to the ambient environment on the other hand, the connection between the housing (30) and the ambient environment being produced via a conduit (50), characterized in that the first casing segment (12) or the second casing segment (14) comprises a planing portion (60) positioned at an outer end of the conduit (50).