Spherical Labyrinth Shaft Seal for Misalignment and Fluid Control
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Solution Overview
Problem
Existing shaft seal assemblies face challenges in maintaining sealing integrity during radial and angular misalignment of shafts, leading to potential contamination and lubricant loss, as they struggle to accommodate varying movements while preventing fluid migration.
Innovation Solution
The proposed shaft seal assembly incorporates a labyrinth seal with a floating stator and anti-rotation pins, allowing for angular and radial misalignment through a spherical interface and pressurized sealing fluid, which maintains seal integrity by articulating and equalizing pressure, thereby preventing contamination and lubricant loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional shaft seal assembly is used, then the structure is simple, but the seal integrity deteriorates during radial and angular misalignment of shafts
Solution Approach 1:
The shaft seal assembly is divided into multiple functional segments: a stationary seal component, a floating secondary seal member that articulates independently, and a pressure balancing system. This segmentation allows each component to perform its specific function while accommodating misalignment, resolving the contradiction between maintaining seal integrity and managing structural complexity.
Solution Approach 2:
The floating secondary seal member is designed to articulate dynamically in response to radial and angular shaft misalignment. This dynamic capability allows the seal to adapt to varying operating conditions and maintain sealing effectiveness without requiring a completely complex rigid structure, thus improving reliability while controlling device complexity.
2Adaptability or versatility
If the shaft seal assembly accommodates misalignment through articulation, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The floating secondary seal member articulates on a spherical surface, providing dynamic adaptability to radial and angular misalignment. This dynamic design allows the seal to accommodate varying shaft positions and orientations, significantly improving adaptability while maintaining a relatively manageable assembly complexity through efficient geometric design.
Solution Approach 2:
The articulation mechanism utilizes a spherical interface between the floating secondary seal member and the stationary seal component. This spherical geometry naturally accommodates multi-directional misalignment and provides smooth articulation, enhancing adaptability while avoiding the need for complex mechanical joints or adjustment mechanisms.
3Reliability
If pressurized sealing fluid is used to maintain seal integrity, then the reliability improves, but the energy consumption increases
Solution Approach 1:
The pressure balancing system is designed to utilize the process fluid itself to balance pressures across the seal interface. The floating secondary seal member and pressure balancing channels work together to automatically equalize pressures without requiring external energy input, thereby improving seal integrity while minimizing additional energy consumption beyond what is already present in the process.
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 effectively maintains seal integrity during shaft misalignment by articulating the labyrinth seal and balancing pressure, ensuring the shaft seal assembly prevents fluid migration and contamination, even under conditions of radial and angular movement.
Implementation Method 1
allowing for angular and radial misalignment through a spherical interface
Implementation Method 2
pressurized sealing fluid, which maintains seal integrity by articulating and equalizing pressure
Data Source
AI summary
An illustrative embodiment of a shaft seal assembly generally includes a first stator, a second stator, and a throttle member. In one illustrative embodiment, the second stator may be formed with a main body and an access plate positioned radially interior with respect to a portion of the first stator. The first stator and second stator may engage one another about a semi-spherical interface comprised of a convex surface on the second stator and a concave surface on the first stator. The second stator may include an internal channel in which a throttle member may be positioned, wherein a radially interior surface of the throttle member may be positioned a shaft.