Integrated Barrier Fluid Pumping in Mechanical Shaft Seals
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Solution Overview
Problem
Existing mechanical shaft seal systems for pumps require complex and space-consuming arrangements for circulating barrier fluid, which complicates their operation and increases spatial requirements.
Innovation Solution
A pump arrangement with a housing and integrated pumping element, connected to the rotatable shaft, that facilitates direct power transmission and efficient circulation of barrier fluid through a barrier fluid cavity, utilizing a wheel or impeller for pumping, which extends radially from the housing to interact with the shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex external pump arrangement is used to circulate barrier fluid, then the barrier fluid circulation is achieved, but the device complexity and spatial requirements increase
Solution Approach 1:
The patent combines the barrier fluid pump with the mechanical seal assembly, integrating the pumping function into the seal housing. The pump is positioned within the seal assembly and uses the mechanical seal's rotation to drive the impeller, eliminating the need for separate external pump arrangements and reducing overall system complexity.
Solution Approach 2:
The mechanical seal assembly serves dual functions: sealing the shaft and pumping barrier fluid. The same rotating components that provide sealing also drive the pump impeller, making the seal assembly a multi-functional unit that performs both sealing and fluid circulation tasks.
2Reliability
If a complex external pump arrangement is used to circulate barrier fluid, then the barrier fluid circulation is achieved, but the spatial requirements increase
Solution Approach 1:
The pump components are nested within the existing seal housing structure. The impeller is positioned inside the seal assembly, utilizing the internal space of the housing, which eliminates the need for additional external space and allows the pump function to be accommodated within the footprint of the mechanical seal.
3Power
If the pump arrangement extends radially inwardly into the sealed space, then direct power transmission is achieved, but the seal cavity space is reduced
Solution Approach 1:
The force transmission projection extends radially inwardly from the housing into the seal cavity, creating a direct mechanical connection from the rotating shaft to the pump impeller. This radial extension allows power transmission without requiring axial space, effectively using the radial dimension to convey mechanical energy to the pumping element.
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 a straightforward and space-saving method for circulating barrier fluid, enhancing the reliability and efficiency of mechanical shaft seals by reducing complexity and minimizing spatial demands.
Implementation Method 1
a wheel or impeller for pumping, which is configured to rotate about the rotational axis
Implementation Method 2
the pumping element is in force transmission connection with the rotatable shaft
Data Source
AI summary
A pump arrangement for pumping barrier liquid in a sealed space of a mechanical shaft seal includes a housing assemblable in connection with a rotatable shaft of a device to be sealed by the mechanical shaft seal. The housing includes a pumping element, which is configured to be in force transmission connection with the rotatable shaft to provide power to operate the pumping element when in use.