Industrial Fan Blade System with Nested Tubular Support
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Solution Overview
Problem
Existing blade systems for industrial fans face challenges in maintaining strength and operating performance under high cyclic and impulsive loads, often requiring oversized blades and increased costs to enhance the supporting unit's strength.
Innovation Solution
The blade system incorporates a supporting unit with a tubular bar having a cross section with a flattened profile, allowing for increased strength without enlarging the blade's external dimensions. This configuration includes a cavity within the blade that houses the supporting unit, providing a shape fit that enhances structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bar of oversized diameter is used to increase the strength of the supporting unit, then the bending strength is improved, but the blade size must be increased and aerodynamic performance deteriorates
Solution Approach 1:
The patent applies nesting by placing a reinforcing bar inside the hollow cavity of the supporting unit tubular bar. The reinforcing bar is nested within the existing structure, providing additional bending strength without requiring an increase in the outer diameter of the supporting unit. This resolves the contradiction by enabling strength enhancement while maintaining the original blade size and aerodynamic performance.
2Strength
If a bar of oversized diameter is used to increase the strength of the supporting unit, then the bending strength is improved, but the costs increase
Solution Approach 1:
The reinforcing bar is nested inside the existing tubular bar structure, utilizing the available internal space. This approach allows strength enhancement through material addition without requiring a proportional increase in the overall structure size, thereby controlling material quantity and costs while achieving the desired bending strength improvement.
Solution Approach 2:
The reinforcing bar is strategically placed within the supporting unit cavity to provide localized strength enhancement where bending stresses are highest. This targeted approach improves bending strength without uniformly increasing material quantity throughout the entire structure, thus controlling costs while achieving the required performance.
3Strength
If materials with good mechanical characteristics are used to increase resistance to bending stresses, then the bending strength is improved, but the costs increase
Solution Approach 1:
The patent creates a composite structure by combining the supporting unit tubular bar (made of base material) with a reinforcing bar (made of material having mechanical characteristics suitable for resisting bending stresses). This composite construction provides enhanced bending strength through the synergistic combination of materials, avoiding the need to entirely replace the base material with expensive high-performance materials, thus controlling material costs while achieving the required strength improvement.
Data Source
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AI summary
Described herein is a blade system (10) for fans for industrial use, comprising: - a blade (12), which extends longitudinally along a first reference axis (K) and defines within it a cavity (12A), wherein said blade has a cross section with flattened profile and is oriented with a major dimension (L1) along a second reference axis (H); and - a supporting unit (14), on which said blade (12) is fixed and which is inserted within the cavity (12A) of said blade, said supporting unit (14) being designed to be connected to the rotor (2) of a fan. The system is characterized in that: said cavity (12A) of said blade (12) has a cylindrical conformation and a cross section with flattened profile and is oriented with its major dimension (L2) along said second reference axis (H); and said supporting unit (14) comprises a tubular bar (16), which has a cross section with flattened profile and is oriented with a major dimension (L3) along said second reference axis (H), or else a first tubular bar (26A) and a second tubular bar (26C) with circular cross section, which are arranged alongside one another along said second reference axis (H).