Progressive Vortex Pump Rotor Axial Load Balancing
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Solution Overview
Problem
Conventional progressive vortex pumps experience excessive axial load on rotors due to pressure imbalances between anterior and posterior fluid films, leading to undue rubbing against diffusers.
Innovation Solution
Incorporating through holes in the rotor along the axial direction allows fluid exchange between posterior and anterior fluid films, promoting pressure balance and preventing rotor-diffuser rubbing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fluid pressure increases along the pumping direction, then pumping efficiency is improved, but axial load on rotor increases causing undue rubbing
Solution Approach 1:
A pressure balance channel is introduced as an intermediary pathway connecting the anterior and posterior sides of the rotor. This channel allows fluid to flow from the high-pressure posterior side to the low-pressure anterior side, mediating the pressure imbalance and eliminating excessive axial load on the rotor while preserving pumping efficiency
2Stress or pressure
If multiple pumping stages are arranged in sequence, then fluid pressure increases, but pressure imbalance between anterior and posterior fluid films worsens
Solution Approach 1:
The pressure balance channel is segmented into multiple sections, with each section corresponding to a pumping stage. This segmentation allows localized pressure balancing at each stage, maintaining overall pressure increase while preventing cumulative pressure imbalance between anterior and posterior fluid films
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 effectively balances fluid pressures, reducing axial loads on the rotor and preventing excessive rubbing, thereby ensuring even operation and extending the pump's lifespan.
Implementation Method 1
a film of anterior fluid is formed between the anterior side of each rotor and the posterior surface of the diffuser coupled to the anterior side of the stator, and a film of posterior fluid is formed between the posterior side of each rotor and the anterior surface of the diffuser coupled to the posterior side of the stator. Since the fluid pressure increases along the pumping direction, the pressure of the posterior fluid film becomes larger than the pressure of the anterior fluid film
Data Source
AI summary
A progressive vortex pump comprises an inlet housing in contact with the pumped fluid, a pump housing connected to the inlet housing, and an outlet housing connected to the pump housing and connected to a pumping pipe. The pump housing comprises a disc-shaped rotor having a central bore and a rim with vanes. Each rotor comprises at least one through hole along the axial direction, the through hole being positioned between the central bore and the rotor rim. Advantageously, the presence of a through hole on the rotor enables, under operating conditions, fluid exchange from the posterior fluid film to the anterior fluid film, thus promoting a pressure balance between the posterior and anterior fluid films, therefore enabling the rotor to work evenly, preventing rubbing on adjacent diffusers.