Centrifugal-to-Axial Mixed Flow Blower for Heat Dissipation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional axial flow blowers in narrow spaces suffer from dead zones and noise issues when used in heat dissipation systems, while cross flow blowers produce loud noise when used in similar applications.

Innovation Solution

A centrifugal-to-axial mixed flow blower design with declined flow passages between adjacent blades of the centrifugal impeller, guiding air to flow radially outward and downward, and a flow guide frame that directs air through a tapered frame passage to an axial air outlet, reducing flow loss and noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If an axial flow blower is used in a narrow space, then the air outlet area can be matched, but dead zones form behind the hub and most air flow is blocked, reducing heat dissipation efficiency

Engineering Contradiction:

Improveair outlet areaVSAvoidheat dissipation efficiency

Core Design Contradiction:

Area of stationary objectVSProductivity

Solution Approach 1:

The patent inverts the conventional axial flow path by using a centrifugal impeller that draws air axially but discharges it radially outward, then uses a flow guide to redirect the radial flow back to axial direction. This inversion allows the impeller hub to be positioned away from the air outlet, eliminating the dead zone problem while maintaining compact axial footprint.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces a radial flow dimension intermediate between axial intake and axial discharge. Air flows axially into the impeller, then radially outward through the impeller channels, and finally is guided back to axial flow direction. This dimensional transition enables efficient air movement through narrow spaces without creating dead zones.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If a cross flow blower is used to increase air outlet area share, then more air can pass through, but loud noise is produced due to radial flow direction

Engineering Contradiction:

Improveair flow throughputVSAvoidnoise

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent uses a radial flow intermediate stage between axial intake and axial discharge, but unlike cross-flow blowers that maintain radial discharge, this design guides the radial flow back to axial direction through a flow guide frame. This dimensional transition reduces noise while maintaining high air flow throughput.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Volume of moving object

If air flows directly through a narrow rectangular air outlet, then the system fits compact spaces, but flow loss increases due to turbulence and blocked air flow

Engineering Contradiction:

Improveblower sizeVSAvoidflow loss

Core Design Contradiction:

Volume of moving objectVSLoss of energy

Solution Approach 1:

The patent introduces radial flow as an intermediate dimension that allows air to bypass the hub area and flow more efficiently. The flow guide frame then transitions this radial flow back to axial direction, reducing turbulence and energy loss while maintaining compact dimensions suitable for narrow spaces.

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

Enables efficient air flow through a narrow air outlet without producing loud noise, effectively changing centrifugal vortical flow to axial flow, suitable for heat dissipation systems in limited spaces with reduced noise and flow loss.

Implementation Method 1

Under a centrifugal effect generated by the operating centrifugal impeller, the air then flows in a direction tangential to the rotation direction of the centrifugal impeller to move from an outer peripheral edge of the centrifugal impeller

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Implementation Method 2

A radially outward declined flow passage is defined between any two adjacent blades, and the declined flow passages are respectively declined from a center toward an outer peripheral edge of the centrifugal impeller

Methodology Applied

Scientific EffectGravity: Gravitation

Data Source

PatentUS11788544B2Centrifugal-to-axial mixed flow blower and heat dissipation system using same

Publication Date: 2023.10.17 ASIA VITAL COMPONENTS CO LTD

AI summary

A centrifugal-to-axial mixed flow blower includes a blower enclosure defining a blower chamber and a centrifugal impeller supported on an impeller seat to suspend in the blower chamber. The centrifugal impeller includes a plurality of blades and a radially outward declined flow passage defined between any two adjacent blades and communicable with the blower chamber. The blower chamber is communicable with a rectangular air outlet of a heat dissipation system via a frame passage of a flow guide frame connected to below the blower enclosure. Air stream centrifugally drawn in by the centrifugal impeller passes through the declined flow passages to radially outward and downward flow into the blower chamber and then passes through the frame passage to flow axially through the rectangular air outlet into the heat dissipation system, so as to realize the effects of reduced noise, changing centrifugal vortical flow into axial flow, and decreased flow loss.