Pump Impeller Blade Segmentation for Turbulence and Backflow Control
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Solution Overview
Problem
Existing vortex pumps face reduced efficiency due to the handling of wastewater with unknown compositions containing solids and chemically aggressive substances, necessitating a solution that maintains reliable operation while optimizing flow control and reducing power consumption.
Innovation Solution
A pump impeller design with alternating blades of two different types, featuring distinct geometries that separate fluid suction and radial acceleration, and a housing element with surface structures to minimize backflow, enhancing flow guidance and pressure buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single blade type with uniform geometry is used in the impeller, then the device complexity is reduced and manufacturing is simplified, but the pump efficiency decreases and discharge head is reduced due to inability to optimize both fluid suction and radial acceleration separately
Solution Approach 1:
The impeller blades are segmented into two distinct types with different geometries: first-type blades optimized for fluid suction with inclined forward edges, and second-type blades optimized for radial acceleration with perpendicular orientation. This segmentation allows each blade type to perform its specific function optimally, resolving the contradiction between efficiency and complexity by creating specialized components rather than using a uniform design for all blades.
Solution Approach 2:
Different regions of the impeller are assigned different blade geometries based on local flow requirements. The first-type blades with inclined edges are positioned where fluid suction is needed, while second-type blades with perpendicular orientation are positioned where radial acceleration is required. This local differentiation optimizes performance in each specific zone without requiring complex control systems.
2Productivity
If the blade edge is inclined forward in the direction of rotation, then fluid suction into the space between blades is improved, but turbulence increases and flow control deteriorates
Solution Approach 1:
The blade population is segmented into two types: first-type blades with forward-inclined edges that generate suction, and second-type blades with perpendicular edges that stabilize flow. By distributing these two blade types alternately around the impeller, the harmful turbulence generated by inclined blades is counterbalanced by the flow-stabilizing effect of perpendicular blades, allowing high suction capability without excessive turbulence.
Solution Approach 2:
The turbulence and flow instability that would normally be harmful side effects of using forward-inclined blade edges are converted into a beneficial control mechanism. The alternating arrangement of inclined and perpendicular blades creates a controlled flow pattern where the turbulence from inclined blades is immediately dampened by perpendicular blades, transforming what would be a harmful effect into a feature that enhances overall flow control while maintaining high suction capability.
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 impeller design increases discharge head and efficiency, maintaining comparable power consumption while reducing turbulence and backflow, thus optimizing pump performance.
Implementation Method 1
The blade geometry of the blade of the first type features a blade edge that is inclined forward in the direction of rotation. This contributes significantly to pumping fluid into the space between the blades.
Implementation Method 2
its radial outward acceleration along the blades
Implementation Method 3
a housing element (100) with an inner housing wall (103) that delimits a flow channel (105) for a fluid medium extending along a central axis (M), wherein the inner housing wall (103) has a surface structure (101) that is designed in such a way that it counteracts backflow
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a pump impeller (1) with an impeller surface (11) on which blades (2, 3) are arranged, wherein at least one of the blades (2, 3) is a blade of the first type (2) having a blade edge (22) inclined forward in the direction of rotation (DR). Furthermore, according to the invention, a pump impeller with blades (2, 3) has blades (2, 3) of a first type (2) and a second type (3) whose blade geometries differ.Alternatively or additionally, a housing element (100) for a pump (200) is specified, comprising an inner housing wall (103) that defines a flow channel (105) extending along a central axis (M) for a fluid medium, wherein the cross-section of the flow channel (105) increases in a main flow direction (H), and wherein the inner housing wall (103) has a surface structure (101) designed to counteract backflow of the fluid medium along the inner housing wall (103) against the main flow direction (H). Furthermore, the invention relates to a pump (200) comprising at least one pump impeller (1) and the housing element (100).