Wall Oven Airflow Layout for Cooler Controls and Outer Surfaces

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Solution Overview

Problem

Built-in wall ovens face challenges with poor airflow and heat management, leading to unsafe exterior surface temperatures during self-cleaning cycles, which can damage electronic controls and pose safety risks, and existing ventilation systems may not meet stringent temperature limits or optimize airflow effectively.

Innovation Solution

A wall oven design featuring a baffled cavity with an exhaust fan that directs air from the control cavity and baffled cavity into an exhaust cavity, using an air divider to separate the control cavity from the exhaust cavity and drawing ambient air to combine with heated air before exhausting it above the door, thereby reducing surface temperatures and improving airflow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a forced air fan is not provided and convection is used for ventilation, then device complexity is reduced, but surface temperature becomes unsafe and exceeds temperature limits

Engineering Contradiction:

Improveventilation system complexityVSAvoidexterior surface temperature

Core Design Contradiction:

Device complexityVSTemperature

Solution Approach 1:

The patent divides the ventilation system into multiple independent air pathways: a first air pathway for ambient air intake at the front, a second air pathway for heated air intake at the rear, and a third air pathway for combined exhaust at the front. This segmentation allows different temperature zones to be managed separately while maintaining a simpler overall structure without requiring a traditional forced air fan.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by creating temperature-specific intake zones: the first air pathway at the front captures cooler ambient air, while the second air pathway at the rear captures heated air. Each pathway is optimized for its specific temperature regime, allowing the system to maintain safe surface temperatures through localized air flow management rather than a uniform ventilation approach.

Inventive Principle:

Principle #3Local quality

2Temperature

If additional baffling is provided to prevent heat contact with outer walls, then surface temperature is reduced, but cooking cavity volume is reduced

Engineering Contradiction:

Improveouter wall temperatureVSAvoidcooking cavity volume

Core Design Contradiction:

TemperatureVSVolume of moving object

Solution Approach 1:

The patent extracts the heat management function from the traditional baffle structure and relocates it to the ventilation system. By using the multi-pathway air flow system to actively remove and redirect heated air away from the outer walls, the patent eliminates the need for additional internal baffling that would reduce cooking cavity volume.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces air as an intermediary medium to manage heat transfer. Instead of using physical baffles to block heat contact, the system uses controlled air flow through the second and third pathways to carry heated air away from the outer walls, allowing heat management without compromising cooking cavity space.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Temperature

If down draft cooling is used to cool electronic controls, then control temperature is reduced, but fan capacity must be larger to counter natural convection

Engineering Contradiction:

Improveelectronic control temperatureVSAvoidfan capacity

Core Design Contradiction:

TemperatureVSPower

Solution Approach 1:

The patent inverts the traditional down-draft cooling approach by using an up-draft configuration. The first air pathway draws cool ambient air in at the front (where controls are located), and the third air pathway exhausts this cooled air at the front above the door. This inversion allows natural convection to assist rather than oppose the cooling flow, reducing the fan capacity needed while maintaining effective control cooling.

Inventive Principle:

Principle #13The other way round (Inversion)

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 design effectively reduces the temperature of electronic controls and enhances airflow, ensuring safer operation and compliance with surface temperature limits, while maintaining a satisfactory cooking cavity volume.

Implementation Method 1

An exhaust fan is in flow communication with the control cavity and the baffled cavity for directing air from the control cavity and the baffled cavity into an exhaust cavity

Methodology Applied

Scientific EffectForced convection: Forced Convection

Implementation Method 2

An air divider separates the control cavity from the exhaust cavity

Methodology Applied

Scientific EffectPhysical separation:

Implementation Method 3

drawing ambient air to combine with heated air before exhausting it above the door, thereby reducing surface temperatures

Methodology Applied

Scientific EffectConvection cooling: Convection

Data Source

PatentUS7964823B2Wall oven and corresponding method

Publication Date: 2011.06.21 HAIER US APPLIANCE SOLUTIONS INC

AI summary

In an embodiment, a wall oven has a cooking cavity surrounded by a baffled cavity. The wall oven has a door for restricting access to the cooking cavity. A control cavity has a front surface maintaining controls for operation of the wall oven. An exhaust fan is in flow communication with the control cavity and the baffled cavity for directing air from the control cavity and the baffled cavity into an exhaust cavity. An air divider separates the control cavity from the exhaust cavity. A method for cooling a control panel of a wall oven is also disclosed.