Centrifugal Pump Segmented Scraper Impeller for Dry Matter
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Solution Overview
Problem
Centrifugal pumps used in applications with high dry matter content fluids face issues with dry matter buildup in the gap between the impeller and back plate, leading to increased friction, energy consumption, and reduced efficiency, necessitating frequent cleaning and potential motor overheating.
Innovation Solution
The centrifugal pump features an impeller with segmented scraper means comprising multiple protrusions that extend radially by ±10% to ±40% of the impeller radius, creating a scraping unit that maintains a clear area behind the impeller, reducing friction and energy consumption by preventing dry matter buildup through increased turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If scraper bars are arranged on the back side of each vane to prevent dry matter buildup, then deposit formation is reduced, but friction increases and energy consumption rises
Solution Approach 1:
The scraper means are divided into multiple protrusions distributed on the back side of the impeller, creating segmented scraping units that collectively cover the gap area without requiring full circumferential contact, thereby reducing overall friction while maintaining effective scraping action
Solution Approach 2:
The protrusions are strategically positioned to provide localized scraping action only where dry matter deposition occurs most severely, rather than continuous scraping around the entire impeller periphery, optimizing the balance between deposit prevention and friction reduction
2Duration of action of moving object
If scraper means are added to the impeller to prevent deposits, then operational time between cleanings is extended, but device complexity increases
Solution Approach 1:
The scraper protrusions are integrated directly into the impeller body as a unified structure, combining the pumping function and scraping function into a single component rather than adding separate scraping mechanisms, thus extending operational time without proportionally increasing complexity
Solution Approach 2:
The impeller performs self-cleaning through its own rotation, with the protrusions automatically scraping deposits as the impeller rotates, eliminating the need for separate cleaning mechanisms or additional moving parts
3Object-generated harmful factors
If the radial extension of scraper means is increased to improve scraping coverage, then deposit prevention improves, but friction and energy consumption increase
Solution Approach 1:
The protrusions extend radially by ±10% to ±40% of the impeller radius, providing sufficient scraping coverage to prevent deposit buildup in the critical gap area without excessive extension that would cause unnecessary friction and energy consumption
Solution Approach 2:
The radial extension parameter of the protrusions is optimized within specific ranges (±10% to ±40% of impeller radius) to achieve the optimal balance between scraping effectiveness and friction minimization, adjusting the coverage area to match the actual deposit formation zone
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 prolongs the time between cleaning cycles, reduces energy consumption, and enhances operational efficiency by minimizing friction and deposit formation, allowing for longer production runs and reduced unproductive cleaning time.
Implementation Method 1
The multiple protrusions are arranged with a distance to each other, and at a various radius on the back side of the impeller... creating a scraping unit that maintains a clear area behind the impeller, reducing friction and energy consumption by preventing dry matter buildup through increased turbulence
Data Source
Figure 1
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Figure 4
AI summary
A centrifugal pump that comprises a casing in which an impeller (1) is arranged. The impeller (1) has a back side (2) that faces a back plate of the centrifugal pump, and one or more vanes (51-55) for pumping the fluid. The back side (2) of the impeller (1) comprises a segmented scraper (3) for scraping from the back plate material that has been deposited from the fluid. The segmented scraper (3) comprises multiple protrusions (101-118), wherein each protrusion of the multiple protrusions (101-118) is facing the back plate, and an aggregated radial extension of the protrusions (101-118) equals a radius of the impeller (1) within an interval of ± 10%, ± 25% or even up to ± 40%.