Bidirectional Centrifugal Fan Blade Structure for Noise Reduction
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Solution Overview
Problem
Conventional centrifugal fan blades have limited structural design, resulting in inadequate air guiding efficiency, pressurization, and high noise, failing to meet user demands for increased air flows and pressure.
Innovation Solution
A blade structure comprising a hub with two levels of blades, where the first and second blade units extend radially from opposite sides of the hub, forming bidirectional flow passages to enhance air guiding and pressurization while reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional single-level blade structure is used, then device complexity is low, but air guiding efficiency and pressurization are insufficient
Solution Approach 1:
The patent transitions from a conventional single-level blade arrangement to a two-level blade structure, adding a vertical dimension to the blade configuration. The first blade unit is arranged at a first level while the second blade unit is arranged at a second level different from the first level, creating a three-dimensional bidirectional pressurizing structure that significantly improves air guiding efficiency and pressurization capability.
Solution Approach 2:
The blade structure is segmented into two independent blade units (first blade unit and second blade unit), each with multiple blades arranged in different directions. This segmentation allows each blade unit to independently guide air flow in different directions, achieving bidirectional pressurization and improving overall air guiding efficiency.
2Stress or pressure
If blade shape modification is attempted, then pressurizing effect may be improved, but structural design freedom is limited by small frame size
Solution Approach 1:
Instead of modifying blade shapes within the constraints of a small frame, the patent adds a vertical dimension by arranging blade units at different levels. This dimensional expansion provides new structural design freedom and achieves enhanced pressurization without requiring larger frame dimensions.
Solution Approach 2:
The pressurization function is divided between two separate blade units operating at different levels and directions. This segmentation allows each blade unit to be optimized for its specific function while collectively achieving superior pressurization performance within the limited frame space.
3Object-affected harmful factors
If conventional blades are used, then device simplicity is maintained, but noise reduction is insufficient
Solution Approach 1:
The blade structure is divided into two blade units with different orientations, allowing air flow to be guided more smoothly in multiple directions. This segmentation reduces turbulence and vortex formation, thereby reducing noise while maintaining structural feasibility.
Solution Approach 2:
The first and second blade units are arranged asymmetrically at different levels and orientations, creating a bidirectional pressurizing structure. This asymmetric arrangement optimizes air flow paths and reduces turbulent flow-induced noise compared to symmetric conventional designs.
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 significantly increases air flows and pressure while improving air guiding efficiency and reducing noise, providing a more effective and quieter centrifugal fan operation.
Implementation Method 1
a centrifugal fan mainly includes a frame, a hub, and a plurality of blades externally spaced along the hub... When the centrifugal fan operates, the blades rotate to cause ambient air to flow. Air axially flows into the frame via the upper and lower air-in openings is guided by the blades to flow in a radial direction of the hub
Data Source
AI summary
A blade structure for centrifugal fan includes a hub, a first blade unit, and a second blade unit. The hub has a connection section formed therearound and the connection section has a first side and an opposite second side. The first and the second blade unit are radially outward extended from the first and the second side, respectively, of the connection section. By providing the first and the second blade unit around the hub of a centrifugal fan, the air flows and air pressure produced by the centrifugal fan can be largely increased at effectively reduced noise.