Fan Impeller with Alternating Blades for Noise Reduction

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Solution Overview

Problem

Conventional centrifugal fans generate loud noise and vibrate severely due to inefficient pressurization of airflow, leading to high power consumption and costly manufacturing processes.

Innovation Solution

A fan impeller structure with alternately arranged upper and lower blades on the hub's circumferential wall, where each blade set has obliquely extending edges to create continuous airflow pressurization, reducing noise and vibration while lowering manufacturing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If multiple radial blades are densely arranged on the hub to increase pressurization, then the wind pressure and air volume can be enhanced, but the manufacturing cost increases and the mold becomes difficult to manufacture

Engineering Contradiction:

Improvewind pressure and air volumeVSAvoidmold manufacturing difficulty and cost

Core Design Contradiction:

PowerVSEase of manufacture

Solution Approach 1:

The blade set is segmented into multiple independent blade elements (first blade, second blade, third blade, fourth blade) arranged around the hub. Each blade has a specific geometric configuration with defined angles and dimensions, allowing the mold to be designed as a segmented or modular structure that is easier to manufacture while still achieving the required pressurization effect through the collective action of all blades

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent specifies precise geometric parameters for each blade (angles, dimensions, positions) to optimize airflow pressurization. By carefully controlling these parameters, the design achieves effective wind pressure and air volume enhancement without requiring excessive blade density, thus maintaining manufacturing feasibility

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If radial blades with short chord length are used, then the manufacturing is simpler, but the airflow cannot be adequately pressurized and noise increases

Engineering Contradiction:

Improveblade manufacturing simplicityVSAvoidnoise and vibration

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent defines specific geometric parameters for the blades including chord length, span, and angular positions that are optimized to achieve adequate pressurization distance. The parameters are carefully selected to ensure the blades are long enough to properly pressurize airflow (reducing noise) while maintaining reasonable manufacturing complexity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The blades feature curved surfaces and arc-shaped configurations rather than straight lines. This curvature allows the blades to more effectively guide and pressurize airflow along their length, achieving noise reduction with moderate blade dimensions that remain manufacturable

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Device complexity

If axial airflow enters the flow ways directly, then the structure is simpler, but the airflow is not continuously pressurized and power consumption increases

Engineering Contradiction:

Improveairflow path structureVSAvoidmotor power consumption

Core Design Contradiction:

Device complexityVSUse of energy by moving object

Solution Approach 1:

The airflow path is designed to pass through multiple blade elements in sequence (first blade, second blade, third blade, fourth blade), creating continuous pressurization zones. The airflow is guided through a continuous path that maintains pressure buildup across multiple stages, ensuring efficient energy transfer and reducing motor power consumption without requiring overly complex structures

Inventive Principle:

Principle #20Continuity of useful action

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 enhances wind pressure and air volume, reduces noise and vibration, and decreases power consumption, while simplifying the manufacturing process and lowering costs.

Implementation Method 1

Each upper blade has a first front edge and a first rear edge downward obliquely extending from the first front edge in a lengthwise direction of the upper blade to together define a first windward face. Each lower blade has a second front edge and a second rear edge upward obliquely extending from the second front edge in a lengthwise direction of the lower blade to together define a second windward face.

Methodology Applied

Scientific EffectAerodynamic force: Aerofoil

Data Source

PatentUS11225974B2Fan impeller structure

Publication Date: 2022.01.18 ASIA VITAL COMPONENTS CO LTD

AI summary

A fan impeller structure includes a hub and a blade set. The hub has a top wall and a circumferential wall extending from a circumference of the top wall. The blade set has multiple upper blades and multiple lower blades. The upper and lower blades are alternately arranged on the circumferential wall. Each upper and lower blade respectively has a first windward face and a second windward face which is extending in a different direction from the first windward face. The first windward face is disposed in such a direction as to face the rear edge of the lower blade on the lower side, while the second windward face is disposed in such a direction as to face the rear edge of the upper blade on the upper side.