Multi-Impeller Pump Cluster Axial Load Reduction
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Solution Overview
Problem
Current multi-impeller pumps require multiple extensions for each impeller and use riveting or welding, leading to inefficiencies and premature failure of drive motor bearings due to axial loads from high pressure imbalances.
Innovation Solution
The impeller cluster design features two or more impellers assembled in-line with axial projections and seals to maintain fixed spacing and rotation, using interference fits and fasteners for securement, and floating seals to balance pressure vectors and reduce axial loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple separable keyed extensions are used for each impeller, then each impeller can be independently mounted, but the device complexity and number of parts increase
Solution Approach 1:
Multiple impellers are merged into a single integrally-formed impeller cluster assembly that rotates as one unit on a single extension, eliminating the need for multiple separable keyed extensions while maintaining the ability to service individual impellers
2Strength
If riveting or welding is used to secure impeller halves, then the impeller structure is strengthened, but manufacturing complexity and potential premature failure increase
Solution Approach 1:
Riveting and welding operations are replaced with a single-threaded fastener system that secures the impeller cluster assembly, eliminating complex manufacturing processes and potential failure points associated with rivets and welds
3Device complexity
If axial loads from high pressure imbalances are not addressed, then the pump structure is simpler, but the drive motor bearings fail prematurely
Solution Approach 1:
A balance drum assembly is introduced as an intermediary component between the impeller cluster and drive motor, which rotates with the impellers and uses centrifugal force to balance axial loads generated by high pressure imbalances, protecting the drive motor bearings
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
This design enhances the efficiency and durability of multi-impeller pumps by allowing seamless assembly and operation, reducing axial loads on drive shafts and bearings, thus preventing premature failure.
Implementation Method 1
the first impeller being engaged with the projection of the second impeller such that all impellers are rotatable as an assembly
Implementation Method 2
floating seals to balance pressure vectors and reduce axial loads
Implementation Method 3
interference fits and fasteners for securement
Data Source
AI summary
A multi-impeller arrangement and to a pump having the impeller arrangement. The impeller arrangement or impeller cluster includes at least two impellers, each impeller having an annular back plate and an annular front plate. The impellers are releasably secured together in an axially in-line series having the front plate of a first impeller at one end and the back plate of a second impeller at the other end. The second impeller includes an axial projection which extends from its back plate, through and beyond its front plate to the first impeller. The first impeller is engaged with the projection of the second impeller such that all impellers are rotatable as an assembly.