Progressive Vortex Pump Shaft Stress Reduction
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Solution Overview
Problem
Conventional progressive vortex pumps experience excessive shear stress on the shaft due to pressure differences between inlet and outlet stages, leading to potential shaft failure.
Innovation Solution
The design incorporates at least two evenly distributed inlet stages connected to circular channels, which are in turn connected to evenly distributed outlet stages along the internal perimeter of the stator, eliminating shear stress on the shaft by arranging each outlet stage of a front pump stage to connect with a respective inlet stage of a rear pump stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single inlet stage and outlet stage are used in each pump stage, then the pump structure is simple, but excessive shear stress acts on the shaft causing potential shaft failure
Solution Approach 1:
The pump stage is segmented into multiple inlet stages (at least two) and multiple outlet stages (at least two), which are evenly distributed along the internal perimeter of the stator. This segmentation allows the pressure difference to be distributed across multiple connection points rather than concentrated at a single location, thereby reducing the shear stress on the shaft while maintaining structural simplicity
Solution Approach 2:
The inlet stages and outlet stages are positioned asymmetrically around the stator perimeter rather than being aligned linearly. This asymmetric distribution creates multiple force vectors that balance each other out, reducing the net shear stress on the shaft. The even distribution of stages around the perimeter ensures symmetric force balancing while allowing asymmetric positioning relative to the shaft axis
2Ease of manufacture
If inlet and outlet stages are concentrated at specific locations, then the pump stage design is straightforward, but shear stress concentrates on the shaft
Solution Approach 1:
The concentration of inlet and outlet stages at specific locations is replaced by segmenting them into multiple distributed positions around the stator perimeter. This segmentation distributes the stress concentration into multiple smaller stress points, reducing the maximum shear stress on the shaft while maintaining ease of manufacture through modular stage assembly
Solution Approach 2:
The inlet and outlet stages are distributed along the circumferential dimension of the stator rather than being concentrated at a single axial location. This dimensional redistribution transforms the stress distribution from a concentrated point load to a distributed load around the perimeter, reducing peak shear stress while simplifying the assembly process
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 configuration results in zero shear stress on the shaft within each pump stage, enhancing the durability and reliability of the progressive vortex pump by mitigating the effects of pressure differences.
Implementation Method 1
the rotation of the rotor causes fluid to enter the pump stage through the stage inlet; the fluid then passes along the circular channel, exits the pump stage through the outlet stage
Implementation Method 2
the inlet stages are evenly distributed along the internal perimeter of the stator and the outlet stages are evenly distributed along the internal perimeter of the stator, with the pump stages arranged such that each outlet stage of a front pump stage is connected to a respective inlet stage of a rear pump stage. Beneficially, the fact that the inlet and outlet stages are evenly distributed along the internal perimeter of the stator results in zero shear stress on the shaft in each pump stage
Data Source
AI summary
A progressive vortex pump having a pump assembly including an inlet valve in contact with a fluid and an outlet valve in contact with a pump pipe, the pump assembly is driven by a shaft connected to a motor assembly and includes a pump body with a variety of pump stages having a stator attached to the pump body, a diffuser attached to the front and rear of the stator, and a rotor coupled to the shaft inside the stator. Each pump stage includes at least two inlet stages in contact with a respective circular channel in contact with a respective outlet stage, the inlet and outlet stages are evenly distributed along the internal perimeter of the stator, and the pump stages are arranged such that each outlet stage of a front pump stage is connected to a respective inlet stage of a rear pump stage.