Heatable Propeller Blade With Internal Heating Channel
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Solution Overview
Problem
Existing fan and propeller blade heating systems at low temperatures suffer from non-uniform heating, leading to icing issues and mechanical damage due to inadequate heat distribution.
Innovation Solution
A heatable blade design featuring a longitudinal channel with a cylindrical heating element, such as a metal rod, inserted within the blade's structure to ensure uniform heat distribution across the entire surface, preventing ice formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If surface mounted heating elements are used on the blade, then heating can be achieved in the heater area, but the heating is non-uniform and insufficient in areas farther from the heating element
Solution Approach 1:
The heating element is moved from a surface-mounted two-dimensional configuration to a three-dimensional configuration by inserting it into a longitudinal channel within the blade structure. This allows the heating element to be surrounded by the blade material, enabling heat to conduct in multiple directions (radially, axially, and circumferentially) rather than only in one direction from the surface, thereby achieving uniform heating throughout the blade.
Solution Approach 2:
The blade material itself acts as an intermediary medium that conducts heat from the heating element to all parts of the blade. By placing the heating element inside the blade structure, the blade material becomes the heat transfer medium that distributes heat uniformly throughout the entire blade, solving the non-uniform heating problem of surface-mounted elements.
2Manufacturing precision
If a longitudinal channel with inserted heating element is used, then uniform heating across the blade surface is achieved, but the device complexity increases
Solution Approach 1:
The longitudinal channel serves multiple functions simultaneously: it provides a pathway for the heating element insertion, acts as a heat distribution conduit, and can be integrated with the blade's structural design. This multi-functionality reduces the need for separate heating and structural components, thereby minimizing the increase in device complexity while achieving uniform heating.
Solution Approach 2:
The heating element is nested within the longitudinal channel, which is itself integrated into the blade structure. This nested configuration allows the heating system to be compact and integrated without adding significant external complexity, as the heating components are contained within the existing blade geometry rather than adding external attachments.
3Ease of manufacture
If heating elements are mounted on the blade surface, then the construction remains simple, but icing still occurs in areas far from the heater
Solution Approach 1:
By moving the heating element from surface-mounted to an internal longitudinal channel configuration, heat can conduct in three dimensions through the blade material, ensuring all areas of the blade including those far from the heater are adequately heated to prevent icing, while maintaining integration within the existing blade structure.
Solution Approach 2:
The blade material serves as an intermediary heat transfer medium that distributes heat uniformly from the heating element to all blade surfaces, ensuring reliable icing prevention across the entire blade while keeping the heating element contained within the blade structure for manufacturing simplicity.
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 solution provides uniform heating across the blade surface, effectively preventing icing and reducing mechanical vibrations, thus enhancing operational safety and reliability in low-temperature applications.
Implementation Method 1
The heating element 19 comprises at least one substantially cylindrical metal rod or head 21... which serves to distribute the heat by contact throughout the mass of the curved body 14
Data Source
Figure 1~2
Figure 3~4
AI summary
A heated fan blade, especially for low temperature application, e.g. snow blower, has a bore (18) running up the length of the blade and close at the blade tip end. The bore is open to the hub end and is fitted with a heating element, e.g. a rod shaped thermistor with flexible connections to the hub. The electric supply to the heater is taken through the fan drive axle.