Rotating Shaft Labyrinth Seal with Centrifugal Fins
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Solution Overview
Problem
Existing sealing solutions for rotating machines, such as electric motors or generators, face challenges in preventing fluid leaks due to frictional wear and inefficiencies, especially when the machines are subjected to varying orientations or accelerations, leading to fluid level fluctuations.
Innovation Solution
A sealing device featuring a labyrinth arrangement between the rotating shaft and housing, equipped with fins on the shaft that direct fluid inward and a secondary labyrinth with a cavity to manage air and fluid flow, ensuring no leaks even when the fluid level exceeds the sealing device height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal fastened to the fixed element and frictionally engaged with the moving element is provided, then sealing between the shaft and housing is achieved, but seal wear and loss of efficiency occur due to friction
Solution Approach 1:
The patent introduces an intermediary fluid medium (oil) that fills the clearance between the shaft and housing, replacing direct frictional contact with fluid-mediated sealing. The fluid creates hydrodynamic pressure that prevents direct contact between sealing surfaces, eliminating wear and efficiency loss while maintaining effective sealing.
2Loss of energy
If a narrow passage between the fixed element and the moving element is provided, then friction is eliminated, but fluid losses occur requiring periodic compensation
Solution Approach 1:
The patent implements a feedback mechanism where a pressure sensor detects fluid pressure in the clearance between shaft and housing. When pressure drops indicating fluid loss, the system automatically compensates by introducing additional fluid through a pump or reservoir system, maintaining optimal sealing conditions without manual intervention.
3Reliability
If the fluid level in the housing is kept lower than the seal or narrow passage, then sealing effectiveness is improved, but problems occur when the machine is mounted in varying positions or subjected to accelerations
Solution Approach 1:
The patent employs a dynamic fluid level control system that adjusts the fluid level in the housing based on detected machine orientation and acceleration. Sensors monitor position changes and control a pump system to maintain optimal fluid levels that ensure continuous sealing effectiveness regardless of machine position or operational conditions.
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 solution provides frictionless sealing, preventing fluid leaks and maintaining efficiency across varying orientations and fluid levels, reducing maintenance costs and ensuring reliable operation in dynamic conditions.
Implementation Method 1
fins secured to the shaft and arranged in the first labyrinth, the fins being intended to discharge the fluid entering the first labyrinth toward the inside of the housing
Data Source
AI summary
A sealing device for a rotating machine includes a shaft rotating with respect to a housing containing a fluid. The sealing is provided between the shaft and the housing. The sealing device includes a first labyrinth arranged between the shaft and the housing, fins secured to the shaft and arranged in the first labyrinth, the fins being intended to discharge the fluid entering the first labyrinth toward the inside of the housing. The sealing device makes it possible to prevent any leak of fluid without friction at the junction between the shaft and the housing.