Segmented Industrial Ceiling Fan Blades for Broad Air Distribution
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Solution Overview
Problem
Industrial ceiling fans face challenges in effectively ventilating large areas due to installation difficulties around obstacles and inefficient airflow distribution, with small fans lacking volume and large fans requiring more clearance and being heavier, while existing solutions do not adequately address these issues.
Innovation Solution
A ceiling fan design featuring adjustable length bars, redundant weld fillets and mechanical fasteners for secure mounting, a safety ring to prevent hub separation, resilient bushings for stress reduction, and tapered, twisted blades that tilt upward to enhance airflow distribution, supported by a lightweight yet powerful motor with a speed-reducing gearbox and variable speed drive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If large fans are used to discharge air at sufficient volume and velocity, then airflow coverage is improved, but installation difficulty increases due to required radial clearance
Solution Approach 1:
The fan blade is divided into multiple segments that can be assembled together to form the complete blade. This segmentation allows the blade to be transported and installed in sections, overcoming the clearance constraints that would prevent installation of a complete large fan blade, while still achieving the required airflow velocity when assembled.
Solution Approach 2:
The fan blade segments are designed to nest within each other or within the fan housing during storage and transport, similar to nested dolls. This nesting arrangement reduces the spatial footprint required for installation, allowing large fan components to be accommodated in spaces with limited radial clearance.
2Productivity
If fan speed is increased to improve airflow, then ventilation effectiveness is improved, but focused draft problem worsens
Solution Approach 1:
The fan blade features varying local qualities including different angles of attack at different radial positions, and a twisted geometry where the blade angle changes from root to tip. This local variation in blade characteristics distributes the airflow more evenly across different zones, preventing the concentration of air flow in a single focused direction while maintaining overall ventilation effectiveness.
3Quantity of substance
If large fans are used to achieve sufficient airflow volume, then ventilation capacity is improved, but fan weight increases
Solution Approach 1:
The fan blade is constructed using composite materials that provide high strength-to-weight ratio. The composite structure allows the blade to maintain the large size and stiffness required for effective airflow generation while significantly reducing the overall weight compared to traditional solid metal blades, enabling large fans to achieve sufficient airflow volume without excessive weight.
4Ease of operation
If small fans are used for installation flexibility, then ease of installation is improved, but airflow discharge volume decreases
Solution Approach 1:
The fan blade incorporates dynamic characteristics including flexibility and the ability to deflect under load. This dynamic behavior allows the blade to optimize its aerodynamic performance during operation, maximizing airflow volume generation within the size constraints that enable flexible installation in spaces with limited clearance.
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 design ensures effective airflow coverage across broad areas, minimizes installation challenges, and maintains fan integrity by distributing air evenly and efficiently, with each blade's upward thrust supporting its weight and contributing to a cumulative reaction force that stabilizes the fan.
Implementation Method 1
a resilient bushing helps couple the fan blades to the hub, wherein the bushing helps minimizes stress at the root of the fan blades
Implementation Method 2
the fan provides an airflow thrust with a reaction force that supports most of the blades weight
Data Source
Figure 1~2
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AI summary
A large industrial ceiling fan (10). includes exceptionally long fan blades (12) with blade tips that can be tilted upward to more broadly distribute the air. Such broad distribution might be particularly beneficial in cases where the fan is installed relatively low to avoid obstacles such as hanging lights, sprinkler heads and rafters. A low mounting position is possible, because the fan is suspended from a hanger (16) of adjustable length. The fan includes several joints that are redundantly bolted and welded for safety. A continuous. retaining ring provides additional safety. A resilient bushing (20) enhances the flexibility of the fan blades and reduces strain where the fan blades connect to a central mounting hub (52). To more broadly distribute the airflow underneath the fan, each fan blade has a twisted geometry to provide an angle of attack that decreases from the root (64) to the tip (14) of the blade.