Vacuum Impeller Shearing Edge Design for Debris Comminution
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Solution Overview
Problem
Conventional debris vacuums, while effective as blowers, often lack optimal shredding capacity due to impellers designed primarily for air flow rather than debris comminution.
Innovation Solution
Incorporating a powered impeller with rotating blades featuring a first shearing edge and a supplemental stationary shearing edge, which interact to enhance shredding capabilities by increasing shearing interfaces within the vacuum chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the impeller is configured to maximize air flow, then blower operation is improved, but shredding capacity deteriorates
Solution Approach 1:
The impeller blade is segmented into multiple functional edges: a first shearing edge for primary debris cutting and a second shearing edge for secondary cutting. This segmentation allows each edge to perform specific shredding functions while the impeller maintains its air-moving capability, resolving the contradiction between air flow optimization and shredding effectiveness
Solution Approach 2:
Different portions of the impeller blade are given different functional qualities: the leading edge is designed for shearing debris while the blade geometry maintains air flow. The first and second shearing edges are positioned at specific locations on the blade to create localized cutting zones that enhance shredding capacity without compromising overall air movement performance
2Productivity
If the impeller is designed for mulching debris, then shredding capacity is improved, but air flow performance deteriorates
Solution Approach 1:
The invention merges two previously separate functions into a single impeller component: air moving and debris shredding. By incorporating multiple shearing edges on the impeller blades, the design combines the air propulsion function with enhanced comminution capability, allowing the impeller to perform both functions simultaneously without requiring separate mechanisms
Solution Approach 2:
The impeller is designed as a multi-functional component that serves both as an air mover and a debris shredder. The blade geometry and multiple shearing edges enable the single impeller structure to perform multiple functions: generating air flow for vacuum/blower operation and providing mechanical comminution of debris, eliminating the need for separate shredding mechanisms
3Productivity
If debris is not finely comminuted, then packing density in container deteriorates, but vacuum operation speed is improved
Solution Approach 1:
The impeller performs preliminary comminution of debris during the vacuuming process itself, before the debris reaches the collection container. The multiple shearing edges cut and shred debris into finer particles as they are being suctioned, so that when debris is deposited in the container, it is already densely packable, eliminating the need for separate shredding steps and maintaining fast operation speed
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 results in more finely comminuted debris, allowing for denser packing in the collection container, reducing the frequency of emptying and completing vacuum tasks more efficiently.
Implementation Method 1
The impeller blade includes a first shearing edge located between a central portion of the base and an outermost radial edge of the impeller blade, wherein the first shearing edge defines a surface of revolution resulting from impeller rotation about the impeller axis
Data Source
AI summary
A debris vacuum having one or more rotating shearing edges and at least one supplemental shearing edge in close proximity to the rotating shearing edges. The supplemental shearing edge may be stationary and attached, for example, to a housing containing the rotating shearing edge, or to a vacuum tube that is itself attachable to the housing.