Dual Cutter Assembly for Submersible Shredder Pump
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Solution Overview
Problem
Existing submersible shredder pumps with single cutter assemblies often clog due to large waste particles, which reduces efficiency and increases the likelihood of clogging, as seen in U.S. Pat. Nos. 8,784,038 and 10,487,835.
Innovation Solution
A dual-sided cutting assembly with a centrally positioned circular plate cutter and two rotary cutters, each with a circular hub and cutting lobes or edges, featuring concentric grooves and dividing walls, which engage on alternate sides of the plate cutter to achieve a finer grind and reduce clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cutter assembly is used, then the device complexity is reduced, but the productivity decreases due to larger waste particles and clogging
Solution Approach 1:
The single cutter assembly is divided into two separate rotary cutters, each with multiple cutting lobes distributed around their perimeters. This segmentation allows for multiple cutting actions to occur simultaneously, reducing particle size more effectively and preventing clogging, thereby improving productivity without significantly increasing overall device complexity.
Solution Approach 2:
The invention transitions from a single-plane cutting action to a multi-dimensional cutting arrangement where two rotary cutters operate on opposite sides of a central axis. This dimensional expansion enables simultaneous cutting from multiple angles, achieving finer particle reduction and improved pumping efficiency.
2Device complexity
If a single cutter assembly is used, then the device complexity is reduced, but the reliability decreases due to increased clogging likelihood
Solution Approach 1:
By dividing the cutting function into two separate rotary cutters with multiple lobes each, the system creates numerous small cutting zones that process material more thoroughly. This segmentation prevents large particles from escaping uncut, thereby reducing clogging and improving reliability.
Solution Approach 2:
The invention changes the cutting parameters by introducing multiple cutting lobes on each rotary cutter, increasing the number of cutting edges and the frequency of cutting actions. This parameter change ensures more consistent particle size reduction, preventing the formation of clog-causing large particles.
3Productivity
If multiple rotary cutters are added, then the productivity is improved through finer grind, but the device complexity increases
Solution Approach 1:
The two rotary cutters are merged into a single integrated assembly that rotates together on a common shaft. This merging approach allows multiple cutting actions to occur simultaneously within a compact structure, achieving fine particle reduction without proportionally increasing device complexity.
Solution Approach 2:
Each rotary cutter is designed with multiple cutting lobes that perform the same cutting function at different positions, creating a multi-functional cutting system. This universality allows the assembly to handle various particle sizes and types effectively while maintaining a relatively simple overall structure.
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 dual-sided cutting assembly effectively reduces waste particles to a finer grind, enhancing efficient removal and significantly reducing the likelihood of pump clogging, allowing for more efficient pumping of solids in liquids.
Implementation Method 1
The cutting lobes being distributed around a periphery of the hub such that each of the distances from the leading edge of each cutting lobe to the trailing edge of a next adjacent cutting lobe are substantially equal; the lower surface of each cutting lobe having a plurality of spaced apart grooves and a dividing wall between adjacent grooves
Data Source
AI summary
A cutter assembly and high volume submersible shredder pump. These are for reducing the size of solids within a liquid which is to be pumped by chopping, grinding, shredding or cutting. An improvement over prior designs employs a cutting assembly and an associated shredder pump, wherein the cutting assembly has a centrally positioned dual sided plate cutter which engages first and second rotary cutters on alternate sides of a centrally positioned dual sided plate cutter. In operation the waste water contents have a much finer grind which improves efficient removal and reduces the likelihood of shredder pump clogging. The cutter assembly is adapted for mounting to an intake opening of a stationary volute, associated with a shredder pump. As a result, many more cutting surfaces are provided which more effectively and quickly shred the solid materials within the liquid to be expelled.