Detachable Crossover Pipes in Multistage Pumps for Lower Hydraulic Loss
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Solution Overview
Problem
Conventional multistage pumps face challenges with cleaning requirements for crossover passageways due to their length and small cross-sectional areas, leading to increased costs and potential performance issues.
Innovation Solution
A multistage pump design featuring detachable crossover and crossunder pipes with improved internal surface roughness, allowing for smaller cross-sections and reduced hydraulic losses, and enabling more flexible positioning and hydraulic optimization through Computational Fluid Dynamics (CFD).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional integrated crossover passageways are used in multistage pumps, then the pump structure is simplified, but the passageways require special cleaning processes due to their length and small cross-sectional areas, increasing manufacturing cost and time
Solution Approach 1:
The invention divides the crossover passageway into two separate components: a stationary passageway integrally formed with the pump casing, and a detachable pipe assembly that can be removed independently. This segmentation allows the pipe assembly to be cleaned or replaced without cleaning the entire integrated passageway, eliminating the need for special cleaning processes while maintaining structural simplicity.
Solution Approach 2:
The invention extracts the crossover pipe function from the integrated casing structure, creating a separate detachable pipe assembly. This extracted component can be easily removed and cleaned independently, solving the cleaning difficulty problem while preserving the benefits of an integrated design.
2Ease of manufacture
If conventional integrated crossover passageways with rectangular or trapezoidal cross-sections are used, then manufacturing is straightforward, but hydraulic losses increase due to surface roughness and undulations
Solution Approach 1:
The invention changes the cross-sectional geometry parameter of the passageway from rectangular or trapezoidal to circular. This parameter change reduces hydraulic losses because circular cross-sections have smaller wetted perimeters for the same flow area, reducing friction losses. The circular cross-section is achieved by using a standard pipe with a circular profile rather than casting a rectangular or trapezoidal passage.
3Ease of repair
If detachable crossover and crossunder pipes are used, then cleaning and maintenance are simplified, but the device complexity increases
Solution Approach 1:
The invention merges the detachable pipe assembly with the pump casing through a standardized connection interface that integrates the pipe mounting blocks into the casing structure. This merging approach allows the pipes to be detachable for maintenance while maintaining a unified, compact overall structure that does not significantly increase device complexity.
Data Source
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AI summary
A multistage pump includes a pump casing, a shaft, a first impeller, a second impeller, and a pipe. The shaft is rotatably disposed within the pump casing and has a longitudinal axis. The first impeller is disposed within the casing at a first position along the shaft. The second impeller is disposed within the casing at a second position and along the shaft. The pipe is detachably attached to the pump casing, and has an inlet and an outlet, the inlet disposed at the discharge of the first impeller and the outlet disposed at an eye of the second impeller, such that discharge from the first impeller can be conveyed to the eye of the second impeller.