Centrifugal Pump Cutting Insert for Waste Water Clogging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Centrifugal pumps experience clogging issues with coarse raw waste and long-fibered textile residues due to inadequate cutting performance and flow guidance, leading to reduced efficiency and increased maintenance costs.
Innovation Solution
The cutting insert is placed inside the impeller, creating a large interior space with large cutting blades and edges, optimized for high flow rates and cutting performance, and is securely fastened to the pump housing with a cylindrical ring area, ensuring effective flow guidance and reduced blockages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the cutting device is arranged upstream of the impeller, then cutting performance is improved, but the suction opening size is reduced and flow rate decreases
Solution Approach 1:
The cutting insert is nested inside the impeller hub, with the cutting blades positioned within the impeller structure. This nesting arrangement allows the cutting device to be integrated into the impeller without occupying external space, thereby maintaining a large suction opening while providing effective cutting action on waste materials.
2Productivity
If the cutting insert protrudes from the impeller opening, then flow guidance is improved, but the risk of rotation and misalignment increases
Solution Approach 1:
The cutting insert is pre-fixed to the pump housing in a non-rotatable manner before the impeller is assembled. This preliminary fixation ensures that the insert remains stationary and properly aligned during operation, eliminating the risk of rotation or misalignment while still allowing the impeller to rotate freely around it for optimal flow guidance.
3Force
If the impeller blades are made larger to increase cutting edges, then cutting performance improves, but the interior space and suction opening are reduced
Solution Approach 1:
The cutting function is segmented into a separate cutting insert with dedicated cutting blades, while the impeller blades focus on flow generation and guidance. This segmentation allows the impeller to maintain a compact design with adequate interior space, while the cutting insert provides the necessary cutting edges without consuming impeller volume.
4Manufacturing precision
If the cutting insert is securely fixed to prevent rotation, then alignment is maintained, but the complexity of assembly and adjustment increases
Solution Approach 1:
The cutting insert is designed with a self-centering feature that automatically aligns with the impeller hub during assembly. The insert includes a protruding portion that fits into a corresponding recess in the impeller, creating a self-aligning connection that eliminates the need for complex adjustment procedures while ensuring precise alignment.
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 configuration enhances cutting force, reduces maintenance, and extends service life by minimizing clogging, while maintaining ease of assembly and design, resulting in improved flow guidance and cutting efficiency.
Implementation Method 1
High cutting force, especially due to the favorable angles of the cutting edges and their shearing effect
Implementation Method 2
elastic design and bearing of the parts of the cutting or shearing device
Implementation Method 3
centrifugal pump with an impeller... optimal flow guidance and a very large suction inlet are achieved
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a centrifugal pump, in particular a waste-water motor pump or dirty-water motor pump, comprising an impeller (3), the side of which facing the pump suction port forms an opening and the side of which facing away from the suction port is covered by a support plate (8) to which the curved blades (14) are fastened, in particular molded. A cutting insert (13) projects into the interior of the impeller, coaxially with the impeller axis, said insert having at least one cutting edge (21) which forms a cutting device together with a mating cutting edge (22) of the impeller.