Segmented Propeller Hub Assembly for Portable Blowers
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Solution Overview
Problem
Existing propellers for portable blowers with pulsed airflow generators face challenges in manufacturing complex geometries, leading to high costs, fragility, and reduced performance due to the need for complex molds and increased space requirements, especially in smaller sizes where existing methods and equipment are inadequate.
Innovation Solution
A propeller design consisting of two coaxially attached parts, a front part with twisted blades and a rear conical part, assembled using a clamping device with a hub that ensures integral rotation, allowing for a simple manufacturing process that produces high-performance, small-sized propellers with optimized aerodynamics and reduced tooling costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex propeller geometries are manufactured using existing molding methods, then manufacturing precision can be achieved, but device complexity and tooling costs increase significantly
Solution Approach 1:
The propeller is divided into multiple segments or blades that can be manufactured separately using simpler molding processes, then assembled together. This avoids the need for complex single-piece molds while achieving the desired geometric precision through modular construction.
Solution Approach 2:
The propeller design incorporates nested structural elements where simpler geometric forms are combined to create the overall complex geometry. This allows manufacturing with less complex tooling by building complexity through assembly of nested components rather than requiring complex molds for the entire structure.
2Volume of moving object
If propeller size is reduced for portable applications, then adaptability to portable devices is improved, but manufacturing precision and performance deteriorate
Solution Approach 1:
By segmenting the propeller into modular blades that can be manufactured separately and assembled, the design achieves precise geometric control even at reduced sizes. This modular approach allows for better tolerance control and assembly precision compared to attempting to manufacture small complex propellers as single pieces with existing molding equipment.
3Ease of manufacture
If blade root radius is increased to simplify blade manufacture, then ease of manufacture is improved, but air inlet cone length and space requirements increase
Solution Approach 1:
The propeller is segmented into blades with optimized root geometries that can be manufactured with standard tooling, eliminating the need for excessively large blade root radii. The segmentation allows each blade to be designed and manufactured independently with appropriate root dimensions, avoiding the need for long air inlet cones while maintaining manufacturing simplicity.
Data Source
AI summary
A propeller of a pulsed airflow generator, in particular for a standalone portable blower, of the type made up of the assembly of two parts coaxially adjoining one another, i.e.: a first front part made as a single piece and comprising a plurality of twisted blades connected to a central ring, and a second rear part with a generally conical shape also made as a single piece, the central portion of said assembly having a conical shape and making up the rear portion of an air-inlet cone, said propeller being characterised in that said first and second rear parts are secured by a clamping device made up of a hub including two parts assembled coaxially and between which said two parts that make up the propeller are clamped, said hub being rotatably secured to the latter and maintaining said front and rear parts in the assembled position thereof.