Deformable-Wall Steam Expansion Chamber for Nutrient-Preserving Cooking

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Solution Overview

Problem

Existing steam cooking methods often lead to the leaching of vitamins and minerals, oxidation of nutrients, and prolonged cooking times, while also potentially crushing food, which compromises the taste and nutritional value of the food.

Innovation Solution

A method and apparatus that utilize a steam expansion chamber with a deformable confinement wall to limit steam contact with food, allowing for controlled steam injection and pressure regulation, which accelerates cooking while minimizing nutrient loss and food crushing, using a steam-producing device integrated with a receptacle and cover system.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If steam is injected into the cooking enclosure throughout the cooking process, then the cooking environment is maintained, but vitamins and minerals leach into the steam and are lost

Engineering Contradiction:
Improvecooking environment maintenanceVSAvoidvitamin and mineral loss
Core Design Contradiction:
ReliabilityVSLoss of substance

Solution Approach 1:

The patent applies preliminary action by injecting steam into the enclosure before placing the food and before the cooking process begins. This pre-conditions the enclosure with steam, creating a humid atmosphere that prevents nutrient leaching during cooking, while avoiding continuous steam injection that would cause leaching.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent uses periodic action by injecting steam only during specific phases (before cooking and optionally during intermediate periods) rather than continuously throughout the cooking process. This intermittent steam injection maintains the cooking environment while minimizing the time food is exposed to steam that could cause nutrient loss.

Inventive Principle:
Principle #19Periodic action

2Reliability

If steam is continuously supplied to the enclosure, then cooking is maintained, but cooking time is prolonged

Engineering Contradiction:
Improvecooking maintenanceVSAvoidcooking time
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The patent implements periodic action by supplying steam in distinct phases rather than continuously. Steam is injected before cooking to prepare the environment, then stopped during the main cooking phase to reduce time, and may be resumed intermittently if needed. This phased approach maintains cooking reliability while significantly reducing total cooking time.

Inventive Principle:
Principle #19Periodic action

Solution Approach 2:

The patent applies the skipping principle by rushing through the steam injection phase before cooking begins, establishing the steam environment quickly, then moving rapidly to the cooking phase without continuous steam intervention. This minimizes the time steam is in contact with food while ensuring the cooking environment is properly established.

Inventive Principle:
Principle #21Skipping (Rushing through)

3Productivity

If high pressure steam is used for rapid cooking, then cooking speed increases, but food is crushed

Engineering Contradiction:
Improvecooking speedVSAvoidfood structure integrity
Core Design Contradiction:
ProductivityVSStrength

Solution Approach 1:

The patent applies parameter changes by carefully controlling steam pressure parameters. Steam is injected at controlled pressures that are sufficient to rapidly condition the enclosure and accelerate cooking, but maintained below thresholds that would crush food. The system dynamically adjusts pressure parameters to optimize both cooking speed and food integrity.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent uses preliminary action by pre-conditioning the enclosure with steam before introducing food or applying high pressure. This preliminary steam injection creates a protective humid environment that prepares the cooking space, allowing subsequent high-pressure steam to cook rapidly without directly crushing the food.

Inventive Principle:
Principle #10Preliminary action

4Reliability

If steam contact with food is increased for thorough cooking, then cooking completeness improves, but nutrient oxidation increases

Engineering Contradiction:
Improvecooking completenessVSAvoidnutrient oxidation
Core Design Contradiction:
ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies preliminary action by injecting steam into the enclosure before placing food, creating a protective steam atmosphere in advance. This pre-established steam environment ensures thorough cooking completeness while the controlled duration and timing of steam exposure minimize oxidative damage to nutrients during the cooking process.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent uses periodic action by providing steam in controlled intervals rather than continuous exposure. Steam is injected before cooking to establish the environment, then stopped during main cooking to reduce oxidation, and may be periodically resumed to maintain cooking completeness. This rhythmic steam application balances thorough cooking with nutrient preservation.

Inventive Principle:
Principle #19Periodic 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 approach promotes faster cooking, preserves vitamins and minerals, maintains the taste of food, and reduces oxidation, allowing for quick and efficient preparation of various dishes without prior food conditioning.

Implementation Method 1

supplying steam to a steam expansion chamber (3) comprising a deformable and/or mobile confinement wall (4) partially delimiting an enclosure (2) receiving food to be heated and/or cooked

Methodology Applied
Scientific EffectSteam heating: Convection

Implementation Method 2

supplying steam to a steam expansion chamber (3) comprising a deformable and/or mobile confinement wall (4)

Methodology Applied
Scientific EffectSteam pressure: Pressure Increase

Data Source

PatentEP3079529B1Method and appliance for heating and/or cooking foods with steam
Publication Date: 2019.11.06 SEB SA
  • EP3079529B1 patent drawingFigure 1
  • EP3079529B1 patent drawingFigure 2~3
  • EP3079529B1 patent drawingFigure 4~5

AI summary

The invention concerns a method for cooking and/or heating foods that consists of supplying steam to a steam expansion chamber (3) comprising a deformable and/or mobile containment wall (4) partially delimiting an enclosure (2) receiving foods to be heated and/or cooked. The invention also concerns an appliance for cooking and/or heating foods, comprising a steam generating device (1) and an enclosure (2) for receiving the foods to be heated and/or cooked. According to the invention, the appliance comprises a steam expansion chamber (3) supplied with steam by the steam generating device (1), and the steam expansion chamber (3) comprises a deformable and/or mobile containment wall (4) partially delimiting the enclosure (2).