Serial Fan Connecting Elements with Air-Guiding Recesses

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Solution Overview

Problem

Conventional serial fans assembled in series experience increased wind shear and noise due to airflow inefficiencies and stagnation, which affect their airflow efficiency and noise levels.

Innovation Solution

The serial fan design incorporates connecting elements with air-guiding recesses on their edges, such as ribs or static blades, to efficiently guide air and reduce rotational noise by creating wind pressure differences and enhancing airflow capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional serial fans are assembled in series with simple connecting elements, then the structure is simple and easy to manufacture, but airflow efficiency decreases and wind shear increases

Engineering Contradiction:

Improvestructural simplicityVSAvoidairflow efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The connecting elements are equipped with air-guiding recesses at specific locations (edges) rather than being uniform throughout. These recesses are strategically positioned to guide airflow smoothly from one fan to the next, improving airflow efficiency only where needed while maintaining simple overall structure

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The connecting elements are divided into multiple segments with air-guiding recesses at different edges, allowing each segment to handle airflow guidance independently. This segmentation enables better airflow management without complicating the entire connecting element structure

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If conventional serial fans are assembled in series with simple connecting elements, then the manufacturing cost is low, but noise levels increase due to wind shear

Engineering Contradiction:

Improvemanufacturing costVSAvoidrotational noise

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

Air-guiding recesses are added only at critical edges of connecting elements where airflow transition occurs, rather than modifying the entire structure. This localized modification reduces wind shear and noise while keeping manufacturing costs low

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The air-guiding recesses convert the potentially harmful sharp edges of connecting elements into beneficial airflow-guiding features. The recesses create smooth airflow transitions that reduce wind shear and associated noise

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Device complexity

If air travels sequentially through conventional serial fans, then the fan structure remains simple, but air stagnation occurs and wind pressure decreases

Engineering Contradiction:

Improvefan structure complexityVSAvoidwind pressure

Core Design Contradiction:

Device complexityVSStress or pressure

Solution Approach 1:

Air-guiding recesses are positioned at specific edges of connecting elements to create localized airflow acceleration zones. These recesses prevent air stagnation at critical transition points without requiring complex overall fan structure changes

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The air-guiding recesses introduce a new dimensional feature (depth/cavity) to the otherwise flat connecting elements. This third dimension enables airflow guidance and pressure management without increasing planar complexity

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 wind pressure and volume while reducing rotational noise, achieving improved airflow efficiency and noise reduction compared to conventional serial fans, with notable improvements in air pressure and volume at various decibel levels.

Implementation Method 1

A plurality of air-guiding recesses are defined on at least one of the edges of the first or second connecting elements to efficiently guide air so as to increase wind pressure and wind capacity

Methodology Applied

Scientific EffectAirflow guidance:

Implementation Method 2

When the air sequentially travels through the impeller 11 and the ribs 103 of the first fan 1 and the ribs 303 and the impeller 31 of the second fan 3, however, the wind shear and noise are relatively increased

Methodology Applied

Scientific EffectWind shear reduction:

Implementation Method 3

the air-guiding recesses can be defined on both edges of the first and second connecting elements... to reduce rotational noise

Methodology Applied

Scientific EffectNoise reduction:

Data Source

PatentUS7661927B2Serial fan with toothed-type connecting elements

Publication Date: 2010.02.16 DELTA ELECTRONICS INC(CN)

AI summary

A serial fan of the present invention includes a first fan and a second fan, each of which includes a housing and an impeller disposed in the housing. The housings respectively include a plurality of connecting elements, and there are several air-guiding recesses defined on the connecting elements of the first fan or the second fan, which can guide air to smoothly flow out from the housing so as to increase airflow and air pressure and reduce noise.