Centrifugal Pump Impeller Blade Height Offset for Flow Control
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Solution Overview
Problem
Existing radial flow pumps with open wheel geometry suffer from reduced efficiency due to backflow and turbulence, which complicates fluid flow and makes cleaning difficult, especially when handling solids like thread algae.
Innovation Solution
The pump design features impeller blades with double edges, where the edges on the open side have a height offset, and the intake is designed with a corresponding lifeline, deflecting the fluid flow directly into the wheel, reducing backflow and turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an open impeller geometry is used, then ease of cleaning and ability to pump solids is improved, but pumping efficiency deteriorates due to backflow
Solution Approach 1:
The impeller blade edge is segmented into two distinct edges through the height offset, creating a dual-edge structure. This segmentation allows the first edge to guide backflow away from the intake while the second edge maintains the open geometry benefits, thus resolving the contradiction between ease of cleaning and pumping efficiency.
Solution Approach 2:
The height offset creates a local structural variation on the impeller blade, where the first edge region has a different height than the second edge region. This local quality change enables selective flow control at specific locations without altering the overall open impeller geometry, maintaining cleaning ease while improving efficiency.
2Adaptability or versatility
If an open impeller geometry is used, then ability to pump solids is improved, but fluid flow stability deteriorates due to turbulence
Solution Approach 1:
The dual-edge structure segments the flow paths, directing backflow through a controlled path away from the intake port. This segmentation stabilizes the main fluid flow by separating it from turbulent backflow, while maintaining the open geometry needed to pump solids.
Solution Approach 2:
The first edge of the impeller blade acts as an intermediary element that intercepts backflow and redirects it away from the intake port. This intermediary structure prevents direct interaction between backflow and the main fluid stream, reducing turbulence while preserving solid pumping capability.
3Productivity
If a closed impeller geometry is used, then pumping efficiency is improved, but ease of cleaning deteriorates
Solution Approach 1:
The height offset creates a localized structural feature on the impeller blade edges without closing the impeller geometry. This local modification enables efficient flow control similar to closed impellers while maintaining the open structure's cleaning advantages.
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 enhances fluid flow by minimizing backflow and turbulence, maintaining the advantages of open wheel geometry such as ease of cleaning, and ensuring efficient operation even with solids present.
Implementation Method 1
the impeller edges and the end face of the intake port engage with each other, a fluid return or gap flow is deflected in such a way that it does not flow straight in towards the drive axis, but is directed back into the impeller in the main flow direction directly
Implementation Method 2
a centrifugal pump, in particular a radial pump or radial centrifugal pump, in whose housing the fluid to be pumped is sucked in via an intake port by means of a motor-driven impeller and pumped in the desired direction via a flow channel and a discharge port
Data Source
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AI summary
A centrifugal pump, in particular a radial pump, with a housing having at least one suction port (1), at least one discharge port (2) and an inner housing forming a flow channel (6), in which an impeller (3) open at least on one side with impeller blades (13) is rotatably arranged about a drive axis (A), wherein the suction port (1) has an end face (8) facing the impeller (3), is designed such that the edges (23) of the impeller blades (13) facing the suction port (1) each have a height offset (h) over their length, which corresponds to a circumferential projection (11) of the end face (8) of the suction port (1).