Power Converter Ventilation Inversion for Dust Control

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Solution Overview

Problem

Existing power conversion systems, such as fuel cell systems, face challenges in preventing dust and foreign particles from entering the internal space through ventilation inlets, which can lead to contamination and inefficiencies.

Innovation Solution

The power conversion system design features an air inlet located above the air outlet, creating a flow path that reduces the entry of dust, dirt, and other foreign particles into the internal space, while also enhancing cooling efficiency and preventing clogging from snow or water.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the air inlet is positioned at a conventional location (e.g., lower or at the same level as air outlet), then the ventilation function is achieved, but dust and foreign particles can easily enter the internal space through the air inlet

Engineering Contradiction:

Improvedust and foreign particles entryVSAvoidair inlet and air outlet positioning

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent inverts the conventional arrangement by positioning the air inlet above the air outlet instead of below or at the same level. This inversion utilizes natural convection currents and gravity to prevent dust and particles from entering through the inlet, as the exhaust air rising from below creates a protective upward flow that repels contaminants away from the inlet opening.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces the air outlet as an intermediary element positioned between the internal space and the external environment below the inlet level. This intermediary outlet creates a buffer zone and establishes a controlled airflow pattern that mediates the interaction between external contaminants and the internal space, preventing direct entry of dust particles.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the air inlet is positioned to prevent dust entry, then contamination is reduced, but cooling efficiency may be compromised

Engineering Contradiction:

ImprovecontaminationVSAvoidcooling efficiency

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The patent ensures continuous and efficient cooling by maintaining an unobstructed airflow path from the inlet above through the internal space to the outlet below. This continuous vertical flow pattern eliminates dead zones and ensures consistent air exchange, maintaining high cooling efficiency while the inlet's elevated position simultaneously prevents contamination.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The patent utilizes pneumatic principles by leveraging natural convection and pressure differentials created by the vertical inlet-outlet arrangement. The elevated inlet captures cooler ambient air that naturally sinks and flows through the housing, while the lower outlet allows heated air to rise and escape, creating a self-sustaining convection current that enhances cooling without mechanical assistance.

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Ease of manufacture

If the air inlet is at a lower position, then installation is simpler, but the air inlet is prone to clogging from snow or water

Engineering Contradiction:

Improveinstallation simplicityVSAvoidclogging resistance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent inverts the conventional low-positioned inlet design by placing the air inlet at the highest point of the housing. This inversion naturally prevents snow and water accumulation, as gravity causes precipitation to fall away from the inlet opening rather than into it, eliminating the clogging issue while maintaining installation simplicity through the straightforward vertical airflow design.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent takes preliminary action by positioning the air inlet above the air outlet during the design phase, proactively preventing potential clogging issues before they occur. This preventive positioning ensures that snow and water cannot accumulate at the inlet, eliminating the need for additional protective mechanisms or maintenance interventions.

Inventive Principle:

Principle #10Preliminary action

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 configuration effectively minimizes the ingress of contaminants, maintains efficient airflow for cooling, and reduces the risk of clogging, thereby ensuring the reliability and performance of the power conversion system.

Implementation Method 1

The air outlet communicates with the air inlet via the internal space of the housing and is located below the air inlet

Methodology Applied

Scientific EffectGravity: Gravitation

Implementation Method 2

The air outlet communicates with the air inlet via the internal space of the housing and is located below the air inlet

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS11477921B2Power conversion system and power storage system

Publication Date: 2022.10.18 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A power conversion system includes a housing (outer housing) and a power converter. The power converter is arranged in an internal space of the housing. An outer peripheral surface of the housing is provided with an air inlet and an air outlet. The air outlet communicates with the air inlet via the internal space of the housing and is located below the air inlet.