Curved Vane Propeller Guard for Debris Shedding
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Solution Overview
Problem
Existing pump propeller guards fail to effectively prevent debris entanglement and human contact, as they often allow weeds and debris to accumulate and become tangled with the propeller and motor drive shaft.
Innovation Solution
A propeller guard with a center hub and fixed, stationary vanes that are circumferentially spaced and not directly attached to each other, allowing the propeller to rotate while radially surrounding it, and featuring a base plate and unique vane configurations to facilitate debris shedding, is designed to protect the propeller from debris and human contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a guard is mounted around a pump propeller to protect against debris and human contact, then safety and propeller protection are improved, but debris can accumulate and become tangled with the propeller and motor drive shaft
Solution Approach 1:
The vanes are designed with curved surfaces instead of flat surfaces. The top edge of each vane is curved to follow the rotation of the propeller, and the radially outward facing edge is curved to facilitate debris shedding. This curvature allows the propeller to rotate freely while preventing debris from becoming tangled, resolving the contradiction between protection and debris entanglement.
Solution Approach 2:
Different parts of the vane have different functions and properties. The top edge is curved to follow propeller rotation, the radially outward facing edge is curved to shed debris, and the vanes are spaced apart to allow water flow. This local differentiation of properties allows the guard to simultaneously protect the propeller and prevent debris entanglement.
2Object-affected harmful factors
If the vanes are directly attached to each other to form a complete guard, then protection coverage is improved, but debris accumulation and entanglement increase
Solution Approach 1:
The guard is divided into multiple separate vanes that are circumferentially spaced around the propeller rather than forming a continuous structure. The vanes are not directly attached to each other, creating gaps that allow water flow and prevent debris from accumulating and becoming tangled. This segmentation maintains protection coverage while eliminating debris accumulation problems.
3Object-generated harmful factors
If the guard structure is made more complex to prevent debris entanglement, then debris shedding is improved, but device complexity increases
Solution Approach 1:
The curved surfaces of the vanes, particularly the radially outward facing edge with its specific curvature, enable effective debris shedding through the geometry alone rather than requiring additional mechanical components. This simple geometric solution achieves debris shedding without increasing device complexity.
Solution Approach 2:
The curvature parameters of the vane surfaces are optimized to facilitate debris shedding. The top edge curvature follows the propeller rotation, and the radially outward facing edge curvature is specifically designed to shed debris. These parameter changes achieve effective debris shedding while maintaining a simple structure.
Data Source
AI summary
An improved guard for a pump propeller is described herein. The guard includes a hub that in use surrounds a drive shaft of a drive motor unit that drives the propeller. The vanes define a propeller receiving area in which the propeller is received allowing the propeller to rotate relative to the vanes, while portions of the vanes radially surround the propeller. The guard is fixed in position about the propeller to protect the propeller from debris and to prevent human contact with the rotating propeller. The guard is designed to shed weeds and other debris, and prevent weeds and other debris from becoming entangled on the guard and with the propeller.