Rotatable Baffles for Radial Fan Backflow Control

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Solution Overview

Problem

Data storage systems face reduced airflow and potential backflow when a radial fan unit fails, requiring additional components and motorized mechanisms to compensate, which can be inefficient and prone to errors in detection and compensation.

Innovation Solution

A fan assembly with rotatable baffles that align their center of mass with pivot axes, allowing them to automatically switch between open and closed positions based on air flow direction, completely surrounding the radial blower unit in the closed position to prevent backflow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If motorized mechanisms and additional components are added to compensate for fan failure, then reliability of airflow control is improved, but device complexity increases

Engineering Contradiction:

Improveairflow control reliabilityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The baffle assembly automatically responds to fan failure conditions through its own mechanical design. When the radial blower unit fails, the baffle rotates to the closed position due to the reverse airflow acting on its surface, completely blocking the inlet axis without requiring external sensors or motorized mechanisms. This self-service mechanism maintains reliability while avoiding additional system complexity.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent converts the harmful reverse airflow caused by fan failure into a beneficial force that automatically triggers the baffle to close. The reverse airflow, which would normally indicate a problem, is instead used as the actuating force to switch the baffle to the closed position, preventing backflow without requiring additional detection or control systems.

Inventive Principle:

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

2Measurement precision

If additional sensors and motorized mechanisms are used for detection and compensation, then detection precision is improved, but ease of operation deteriorates

Engineering Contradiction:

Improvefailure detection precisionVSAvoidsystem operation simplicity

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The baffle assembly performs both detection and response functions through its mechanical design alone. The reverse airflow automatically causes the baffle to rotate to the closed position, eliminating the need for sensors, processors, or motorized actuators. This maintains operational simplicity while achieving reliable detection and response to fan failure conditions.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces electronic detection and control systems with a purely mechanical response mechanism. The baffle's rotation is directly driven by the airflow forces themselves, substituting complex electronic sensing and actuation systems with a simple mechanical system that responds automatically to flow conditions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If fan speed is increased to compensate for reduced airflow, then productivity is maintained, but use of energy increases

Engineering Contradiction:

Improveairflow volumeVSAvoidfan energy consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent converts the wasted energy that would be consumed by increasing fan speed into useful work by using the reverse airflow itself to actuate the baffle. This prevents backflow and maintains effective cooling airflow without requiring additional energy input, as the system uses the existing (harmful) reverse flow to trigger the protective response.

Inventive Principle:

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

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 effectively limits backflow and maintains efficient airflow by using the airflow itself to rotate the baffles, ensuring continuous operation and reduced energy consumption without the need for additional sensors or motorized mechanisms.

Implementation Method 1

a radial blower unit configured to exhaust air radially from an inlet axis of the radial blower unit

Methodology Applied

Scientific EffectAir flow:

Implementation Method 2

air is pulled along a rotational axis of the blades and exhausted in a direction radially from the rotational axis to rotate the baffles around respective centers of mass to the open position

Methodology Applied

Scientific EffectAir flow force:

Data Source

PatentUS11384773B2Air flow control in data storage systems

Publication Date: 2022.07.12 SEAGATE TECH LLC

AI summary

A fan assembly includes a radial blower unit configured to exhaust air radially from an inlet axis of the radial blower unit. The fan assembly also includes baffles each partially surrounding the radial blower unit. The baffles are rotatable between an open position and a closed position around respective pivot axes, and the baffles have respective centers of mass aligned with the respective pivot axes.