Double Volute End Suction Pump Balanced Fluid Distribution
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Solution Overview
Problem
Existing double-suction centrifugal pumps with split inlet passages and separate impeller feeding lack efficiency in fluid distribution and balance, leading to potential cavitation and restricted flow paths.
Innovation Solution
A double impeller end suction pump design where opposing impellers are driven by a common shaft and fed by a single inlet source, featuring a two-piece housing with a mechanical seal and seal rings for balanced fluid input and efficient assembly, and an open waterway between impellers for self-adjusting flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single impeller double suction pump design is used, then the pump structure is simpler, but the fluid distribution balance and cavitation resistance are insufficient
Solution Approach 1:
The pump is segmented into two separate impellers (first impeller and second impeller) positioned on opposite sides of the drive shaft, each handling fluid flow independently. This segmentation allows balanced fluid distribution and improved cavitation resistance while maintaining a relatively simple overall structure through the common drive shaft and housing.
2Volume of moving object
If opposing impellers are positioned close together on a common drive shaft, then the pump size is reduced, but the flow paths become restricted and fluid distribution is unbalanced
Solution Approach 1:
The impellers are arranged in a spatial configuration where they rotate in opposite directions on the same drive shaft, utilizing the dimensional space efficiently. The first impeller rotates clockwise while the second impeller rotates counterclockwise, allowing independent fluid intake paths from opposite sides while maintaining compact pump dimensions.
3Reliability
If a two-piece housing with mechanical seal is used, then the assembly precision and sealing reliability are improved, but the manufacturing complexity increases
Solution Approach 1:
The housing is divided into two separate pieces (first housing piece and second housing piece) that can be manufactured independently and then assembled together. This segmentation allows for easier manufacturing of each individual housing piece while providing precise alignment features and integrated mechanical seal components that ensure reliable sealing at the assembly interface.
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
Enhances lift pressure and displacement potential while preventing cavitation by allowing fluid to self-adjust based on downstream characteristics, ensuring efficient and balanced fluid distribution between impellers.
Implementation Method 1
centrifugal pumps and more particularly to pumps having two impellers powered by a single drive shaft
Data Source
AI summary
A pump having two impellers driven by a common drive shaft where the impellers have suction inlets facing each other and are configured to axially receive fluid from a common chamber. A direct line path exists between suction inlets of the respective impellers. A mechanical seal having a two-piece housing is positioned with a first cup component of the housing fastened at an inboard side of an outboard head of the pump.