Lightweight Fan Blade Tips Reducing Rotational Inertia
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional ceiling fan blades with heavy tip devices increase rotational inertia and power consumption due to their weight, which negatively affects performance.
Innovation Solution
The use of lightweight fan blade tips with a shaped body that encases an internal support structure, formed from materials with different densities, such as foam and high-density plastics, to reduce aerodynamic drag and inertial mass, thereby improving efficiency and reducing power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If heavy tip devices are used to reduce aerodynamic drag, then aerodynamic performance is improved, but rotational inertia and power consumption increase
Solution Approach 1:
The blade tip device combines foam material (low density) with a skin structure to create a composite construction that reduces overall weight while maintaining aerodynamic shape. This resolves the contradiction by providing drag reduction through the streamlined外形 without the excessive weight of conventional solid tip devices.
Solution Approach 2:
The invention changes the density parameter of the blade tip material from high-density solid materials to low-density foam material, thereby reducing weight while maintaining the aerodynamic function. This parameter change allows the tip to reduce drag without proportionally increasing rotational inertia.
2Productivity
If blade tip devices are added to improve aerodynamics, then aerodynamic efficiency is improved, but blade weight and rotational inertia increase
Solution Approach 1:
The foam-filled blade tip with skin construction creates a lightweight composite structure that provides aerodynamic efficiency without the full weight penalty of traditional solid tip devices. The foam core provides structural support at minimal weight.
Solution Approach 2:
The aerodynamic shaping is applied locally at the blade tip region rather than throughout the entire blade, concentrating the aerodynamic benefit where it is most needed while minimizing additional weight. The foam material allows this localized aerodynamic treatment without excessive mass addition.
3Strength
If conventional solid tip devices are used, then structural strength is maintained, but weight and power consumption increase
Solution Approach 1:
The combination of foam material with a skin structure creates a composite that provides adequate structural strength for the blade tip application. The skin provides the load-bearing surface while the foam core provides structural support at minimal weight, reducing the moment of inertia and associated power requirements.
Solution Approach 2:
Changing from high-density solid materials to low-density foam material with skin construction alters the strength-to-weight ratio parameter, providing sufficient strength at lower weight, thereby reducing the energy required to rotate the blades.
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 lightweight blade tips decrease aerodynamic drag and rotational inertia, leading to more efficient operation and reduced power consumption, while maintaining structural integrity and aerodynamic shape.
Implementation Method 1
reduce aerodynamic drag and inertial mass
Implementation Method 2
a shaped body formed from a lightweight material that at least partially encases and encapsulates an internal support structure
Data Source
AI summary
Fans having fan blades with lightweight blade tips are disclosed herein. In one embodiment, for example, each fan blade includes a blade tip attached to an end portion of a main airfoil. The blade tip includes a shaped body that is molded over a support structure to form the shape and exterior surface of the blade tip.