Vertical Slide Ring Seal Flushing for Sterile Agitator Service
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Solution Overview
Problem
Vertically arranged mechanical seal assemblies, particularly agitator seals, face challenges in safe sterilization due to stagnant fluid accumulation and potential damage from solids-laden media, leading to operational issues and failure.
Innovation Solution
A mechanical seal arrangement with a rotating and stationary seal ring, a spring element for axial preload, and a driver with grooves in the collar to ensure continuous flushing and prevent stagnant fluid accumulation, optimizing fluid flow and reducing thermal and mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mechanical seal assembly is arranged vertically, then it can be used in agitator seals for various applications, but stagnant fluid accumulates in certain areas making sterilization difficult
Solution Approach 1:
The driver housing is segmented with window recesses that create separate flow paths, allowing fluid to be directed through specific channels rather than accumulating in dead zones. This segmentation enables complete drainage and sterilization while maintaining the vertical arrangement needed for agitator applications
Solution Approach 2:
The window recesses act as intermediary flow channels that mediate between the driver interior and exterior, ensuring complete fluid circulation and preventing stagnant areas. These recesses serve as intermediate zones that facilitate complete drainage and sterilization access
2Adaptability or versatility
If the mechanical seal assembly operates in solids-laden media, then it can handle various process conditions, but mechanical stress on components increases leading to potential damage
Solution Approach 1:
Solids-laden media are extracted or flushed out continuously through the window recesses and grooves, preventing accumulation and reducing mechanical stress on seal components. The design actively removes harmful particles from critical areas
Solution Approach 2:
The spring element is preloaded to compensate for wear and maintain sealing contact before damage occurs. This preliminary action ensures continuous sealing pressure despite mechanical stress from solids-laden media
3Force
If the spring element is positioned in the driver interior, then axial preload is achieved, but solids-laden fluids can impair spring function
Solution Approach 1:
The window recesses serve as intermediary flow channels that allow flushing media to reach the spring element in its interior position, preventing solids accumulation while maintaining the space-saving internal arrangement
Solution Approach 2:
Hydraulic flushing through the window recesses and grooves removes solids-laden fluids from around the spring element, maintaining spring functionality through fluid dynamics rather than mechanical protection
4Temperature
If continuous flushing is implemented, then thermal stress is reduced and heat dissipation improves, but fluid flow optimization is needed to minimize turbulence and friction losses
Solution Approach 1:
The groove geometry and window recess dimensions are optimized locally to minimize turbulence and friction losses in specific flow regions. The groove cross-section and orientation are tailored to each location's flow requirements
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
Enables safe and simple sterilization, reduces thermal stress, prevents mechanical damage, and improves fluid flow and heat dissipation, ensuring reliable operation in solids-laden media.
Implementation Method 1
a spring element (6) for axially preloading the mechanical seal
Implementation Method 2
The groove (9) is designed such that a medium can flow from an interior region (85) of the driver (8) via the groove (9) to an exterior of the driver (8)
Implementation Method 3
The rotating seal ring (3) has a first sliding surface (3a) and the stationary seal ring (4) has a second sliding surface (4a), wherein a sealing gap (5) is defined between the seal rings
Data Source
Figure 1
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AI summary
The invention relates to a vertically arranged mechanical seal assembly comprising a mechanical seal (2) with a rotating sliding ring (3) and a stationary sliding ring (4), wherein the rotating sliding ring (3) has a first sliding surface (3a) and the stationary sliding ring (4) has a second sliding surface (4a), wherein a sealing gap (5) is defined between the sliding surfaces (3a, 4a), a driver (8) configured for transmitting torque from a rotating component to the rotating sliding ring (3), a spring element (6) which is arranged in an axial direction (XX) in an inner region of the driver (8) between the driver (8) and a rear side (3b) of the rotating sliding ring (3), wherein the driver (8) has a hollow cylindrical driver housing (80) with an inwardly directed inner flange (81), wherein the inner flange (81) is configured for supporting the spring element (6).wherein the driver housing (80) has at least one window recess (83) such that an arcuate collar (84) extending circumferentially is formed, wherein at least one groove (9) extending through the collar (84) is formed, which has a groove depth extending to the inner flange (81) in order to provide an outflow path for medium from the interior (85) of the driver (8).