Pump Cutting Ring with Axial Teeth for Clog-Resistant Solids Handling
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Solution Overview
Problem
Existing cutting units for pumps become clogged by solids, reducing efficiency and requiring frequent maintenance, and disrupt the inflow into the pump, leading to operational inefficiencies.
Innovation Solution
A cutting ring with axially oriented cutting teeth and material recesses or depressions that provide a cutting action for solids adhering to the cutting head, reducing friction and ensuring a reliable, unobstructed inflow by allowing solids to be chopped effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cutting unit with cutting teeth is used to chop solids in solids-loaded fluid, then the cutting action is improved, but the cutting unit becomes clogged by solids and requires frequent maintenance
Solution Approach 1:
The patent changes the geometric parameters of the cutting teeth by introducing axial depressions that extend radially outward, creating a wave-like cutting edge configuration. This parameter change allows solids to be effectively chopped while preventing accumulation in the cutting area, thereby maintaining cutting effectiveness without increasing maintenance frequency
Solution Approach 2:
The cutting ring is segmented into multiple cutting teeth with individual axial depressions, creating distinct cutting zones. This segmentation allows each cutting tooth to independently process solids while the depressions prevent clogging between teeth, improving reliability without requiring frequent maintenance
2Reliability
If a cutting unit is disposed upstream of the pump, then solids are chopped, but the cutting unit has a negative effect on the efficiency and characteristics of the pump due to influence on inflow
Solution Approach 1:
The patent introduces axial depressions that extend radially outward from the cutting ring base body, adding a radial dimension to the cutting tooth structure. This dimensional change creates clearance spaces that allow fluid to flow more freely around the cutting teeth, reducing disruption to pump inflow while maintaining solids chopping capability
Solution Approach 2:
The cutting ring has different local qualities: the cutting teeth provide aggressive chopping action where needed, while the axial depressions provide flow-friendly clearance zones. This local differentiation allows effective solids processing without negatively impacting overall pump efficiency
3Power
If the cutting area is reduced to reduce friction and torque requirements, then the cutting action becomes less effective, but with material recesses the cutting action remains effective while friction is reduced
Solution Approach 1:
The patent changes the effective cutting area parameter by introducing material recesses that reduce the radial extent of the cutting teeth. This parameter change reduces the friction area while the wave-like cutting edges maintain cutting effectiveness, achieving lower torque requirements without sacrificing reliability
Solution Approach 2:
Material is extracted from the cutting teeth to create axial depressions, removing excess material that would otherwise increase friction. This extraction reduces the cutting area to only where needed for effective chopping, lowering torque requirements while maintaining cutting action effectiveness
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 cutting ring enhances hydraulic efficiency and reduces maintenance needs by providing a more reliable cutting action, preventing clogging, and optimizing the inflow into the pump.
Implementation Method 1
the material recess reduces the cutting area, which reduces friction, so that less torque is required
Data Source
AI summary
Subject matter of the invention is a cutting ring for solids-loaded fluid of a pump, comprising a cutting ring base body forming an opening for cooperation with a cutting head, which cutting ring can be stationarily connected to the pump in an axial extension of an impeller of the pump, whereina plurality of cutting teeth comprising respectively at least outer cutting edges oriented away from the impeller in the direction of a suction side of the pump are provided at the cutting ring base body around the opening, wherein the cutting teeth extend axially away from the cutting ring base body outwardly at least in the direction of the suction side, andat least in the outwardly extending cutting teeth a respective radially outwardly extending material recess is formed, and/ora radially outwardly extending axial depression is formed in the cutting ring base body in a valley between two at least outwardly extending cutting teeth.