Air ventilation apparatus using coanda effect and air ventilation method using coanda effect

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Solution Overview

Problem

Conventional air ventilation apparatuses in vehicles face challenges in adjusting wind direction effectively due to the narrow mechanical dimensions required for ultra-slim designs, particularly when the vertical width of the wind outlet is 15 mm or less.

Innovation Solution

The air ventilation apparatus employs the Coanda effect to naturally adjust the discharge wind direction by using a curved surface connected to the dashboard garnish, and further enhances this effect by artificially forming a vortex, eliminating the need for conventional vertical wind direction adjusting wings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If the vertical width of the wind outlet is reduced to 15 mm or less for ultra-slim design, then the aesthetic appearance and slim profile are improved, but the conventional vertical wind direction adjusting wing structure cannot be applied and the mechanical dimension becomes too narrow

Engineering Contradiction:

Improvevertical width of wind outletVSAvoidwind direction adjustment

Core Design Contradiction:

ShapeVSEase of operation

Solution Approach 1:

The patent replaces the conventional mechanical wind direction adjusting wing structure with a system utilizing the Coanda effect and vortex formation. Air guides with curved surfaces create Coanda effects that naturally redirect airflow upward or downward without requiring physical adjusting wings, thereby enabling ultra-slim outlet design while maintaining wind direction control capability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical parameters of the outlet by reducing the vertical width to 15 mm or less. This parameter change is made possible by transitioning from mechanical adjustment to fluid dynamic control (Coanda effect), allowing the outlet to achieve ultra-slim dimensions while still providing effective wind direction adjustment through airflow manipulation

Inventive Principle:

Principle #35Parameter changes

2Shape

If the vertical width of the wind outlet is reduced to 15 mm or less, then the ultra-slim design is achieved, but the internal structure becomes more complex and difficult to implement

Engineering Contradiction:

Improvevertical width of wind outletVSAvoidinternal structure

Core Design Contradiction:

ShapeVSDevice complexity

Solution Approach 1:

The patent extracts and removes the conventional vertical wind direction adjusting wing structure from the system. By eliminating this mechanical component, the outlet can be designed with reduced vertical width (15 mm or less) while wind direction control is achieved through the Coanda effect generated by strategically positioned air guides with curved surfaces

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs curved surfaces in the air guides to generate the Coanda effect. The curved geometry of the air guides creates airflow attachment to the surface, producing the necessary lift force to redirect air upward or downward. This curvature-based approach enables ultra-slim outlet design without complex internal mechanical structures

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Shape

If the vertical width of the wind outlet is reduced to 15 mm or less, then the ultra-slim aesthetic design is achieved, but the outlet pressure increases making implementation difficult

Engineering Contradiction:

Improvevertical width of wind outletVSAvoidoutlet pressure

Core Design Contradiction:

ShapeVSStress or pressure

Solution Approach 1:

The curved surfaces of the air guides generate the Coanda effect, which creates a low-pressure region that draws airflow along the curved path. This pressure differential mechanism allows the system to control wind direction without requiring high outlet pressure, enabling ultra-slim design while managing pressure constraints

Inventive Principle:

Principle #14Spheroidality (Curvature)

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

This solution allows for efficient adjustment of wind direction upward or downward, simplifies the internal structure, and enables the creation of an ultra-slim air ventilation apparatus with improved exterior design, while minimizing outlet pressure.

Implementation Method 1

a wind direction is adjusted by applying a Coanda effect. The Coanda effect is discovered by Romanian Henri Coanda, which refers to a phenomenon in which a fluid jet ejected adjacent to a portion of a surface is attracted to the surface to flow

Methodology Applied

Scientific EffectCoanda effect: Coanda Effect

Implementation Method 2

in addition to the Coanda effect, a structure for artificially forming a vortex is added to the air ventilation apparatus to maximize the Coanda effect

Methodology Applied

Scientific EffectVortex formation: Vortex Ring

Data Source

PatentUS12203673B2Air ventilation apparatus using coanda effect and air ventilation method using coanda effect

Publication Date: 2025.01.21 HYUNDAI MOBIS CO LTD

AI summary

In the present invention, a wind direction is not directly changed using a wind direction adjusting wing and a guide related thereto, but the wind direction is changed due to the Coanda effect and the vortex formation. A basic principle of the present invention of adjusting a wind direction by applying a Coanda effect is to design the air ventilation apparatus such that a wind direction is adjusted upward or downward by causing a Coanda effect on one curved surface of the air ventilation apparatus connected to a skin surface of a dashboard garnish and preventing the Coanda effect from being caused on an opposite surface. In addition to the Coanda effect, a structure for artificially forming a vortex is added to the air ventilation apparatus to maximize the Coanda effect.