MEMS Airflow Cell Array With Virtual Valve for Heat Dissipation

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Solution Overview

Problem

Existing MEMS air pulse generating devices face challenges in providing significant airflow for applications requiring improved heat dissipation.

Innovation Solution

The device employs a first and second cell with opposite air pressure polarities, utilizing a flap pair to perform synchronized common-mode and differential-mode movements to create airflow, enhancing airflow generation through a virtual valve mechanism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a single cell MEMS device is used, then the device size remains small, but the airflow generation capability is insufficient

Engineering Contradiction:

Improveairflow generation capabilityVSAvoiddevice size

Core Design Contradiction:

ProductivityVSVolume of moving object

Solution Approach 1:

The device is divided into multiple independent cells (first cell and second cell with opposite polarities) that can be fabricated using standard MEMS processes. Each cell generates airflow in a specific direction, and by combining multiple cells, the total airflow capability is significantly enhanced while maintaining the benefits of MEMS fabrication scalability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention transitions from a single-cell design to a multi-cell array configuration, adding spatial dimensionality to the device. This allows airflow generation in multiple directions and significantly increases total airflow capacity without proportionally increasing device complexity, as cells can be arranged in planar arrays

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If multiple cells with opposite polarities are used, then airflow capability is significantly improved, but device complexity increases

Engineering Contradiction:

Improveairflow capabilityVSAvoiddevice structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple cells with opposite polarities are merged into a single integrated device structure. The cells work cooperatively to generate enhanced airflow, with the opposite polarity cells creating pressure differentials that drive airflow through the device. This merging allows the system to achieve superior performance while maintaining a compact form factor

Inventive Principle:

Principle #5Merging (Combining)

3Temperature

If conventional MEMS APG devices are used, then heat dissipation is limited, but ultrasonic energy leakage occurs

Engineering Contradiction:

Improveheat dissipation performanceVSAvoidultrasonic energy leakage

Core Design Contradiction:

TemperatureVSLoss of energy

Solution Approach 1:

The device employs periodic pulsing operation where cells are activated in alternating sequences. This periodic action creates controlled air pulses that enhance convective heat transfer while allowing energy recovery between pulses. The pulsed operation mode reduces continuous ultrasonic energy leakage while maintaining effective heat dissipation through enhanced airflow

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The device recovers energy that would otherwise be lost as ultrasonic leakage by using it to drive the opposite polarity cells in an alternating sequence. The energy management strategy converts potential energy waste into useful airflow generation, improving overall system efficiency while enhancing heat dissipation capability

Inventive Principle:

Principle #34Discarding and recovering

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 achieves improved airflow performance, scalability, and reduced ultrasonic energy leakage, resulting in higher airflow velocities compared to previous designs.

Implementation Method 1

The first cell is disposed within a first region and generates a first air pressure with a first polarity. The second cell is disposed within a second region and generates a second air pressure with a second polarity, wherein the second polarity is opposite to the first polarity.

Methodology Applied

Scientific EffectPressure differential: Pressure Gradient

Implementation Method 2

a film structure, configured to perform a movement to push or pull a volume over the film structure to generate a positive pressure and a negative pressure

Methodology Applied

Scientific EffectPressure generation through volume displacement: Pressure Gradient

Implementation Method 3

a flap pair, comprising a first flap and a second flap opposite to each other, configured to perform a differential movement to form a virtual valve; wherein the differential movement performed by the flap pair is synchronized with the movement performed by the film structure; wherein an airflow is formed when the virtual valve is opened

Methodology Applied

Scientific EffectValve mechanism: Valve

Data Source

PatentEP4700249A1Airflow generating device and method thereof

Publication Date: 2026.02.25 XMEMS LABS INC

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AI summary

An airflow generating device includes a first cell and a second cell. The first cell is disposed within a first region and generates a first air pressure with a first polarity. The second cell is disposed within a second region and generates a second air pressure with a second polarity. The second polarity is opposite to the first polarity.