Thermal-Actuated Cooking Lid Venting for Foam Overflow Prevention
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Solution Overview
Problem
Existing cooking vessel lids do not effectively prevent the overflow of boiling contents due to foam formation, leading to potential safety hazards and messy clean-ups, as they often lack sufficient venting mechanisms that can accommodate the pressure and temperature changes during cooking.
Innovation Solution
A lid design featuring a shape memory alloy spring or bimetallic actuator that automatically tilts or opens when the contents reach a pre-set temperature, creating a sufficient venting opening to release steam and prevent foam overflow, while maintaining the lid's sealing properties to retain heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a lid is used to cover the container during cooking, then heat retention is improved and energy is saved, but foam can form and spill over the edge causing overflow
Solution Approach 1:
The lid incorporates a localized steam vent hole that provides targeted venting functionality in a specific area of the lid, allowing steam escape while maintaining overall lid coverage for heat retention. This local modification resolves the contradiction by enabling selective functionality (venting) without compromising the overall sealing property.
Solution Approach 2:
A steam vent mechanism acts as an intermediary element between the sealed container interior and the external environment. This intermediary allows controlled steam escape through the vent hole, preventing pressure buildup and foam overflow while maintaining the lid's heat retention function.
2Object-affected harmful factors
If a small vent hole is provided in the lid to allow steam escape, then pressure venting is improved, but the opening is insufficient to guarantee adequate venting of large volumes of boiling contents
Solution Approach 1:
The lid system transitions from a static small hole to a dynamic opening mechanism. The steam vent hole can enlarge or open wider in response to increasing internal pressure and steam volume, ensuring the venting capacity adapts to the cooking conditions and maintains reliability throughout the cooking process.
Solution Approach 2:
The venting system changes its physical parameters (opening size) in response to changing cooking conditions (steam pressure and volume). This parameter change allows the vent hole to provide sufficient opening area when needed while maintaining a closed state when not required.
3Productivity
If the lid is designed to remain closed to retain heat, then energy efficiency is improved, but the lid cannot release steam and prevent foam overflow
Solution Approach 1:
The lid implements periodic or conditional opening action through the steam vent mechanism. Instead of remaining permanently closed or completely open, the lid periodically releases steam through the vent hole when pressure thresholds are reached, maintaining heat retention during normal cooking while preventing steam accumulation and foam overflow.
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 prevents foam overflow and associated safety risks by automatically adjusting the lid's position to accommodate increased pressure and temperature, ensuring efficient cooking and reducing cleaning efforts.
Implementation Method 1
A lid design featuring a shape memory alloy spring or bimetallic actuator that automatically tilts or opens when the contents reach a pre-set temperature
Implementation Method 2
A lid design featuring a shape memory alloy spring or bimetallic actuator that automatically tilts or opens when the contents reach a pre-set temperature
Implementation Method 3
maintaining the lid's sealing properties to retain heat
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
Lid for a container (13, 113, 213, 313, 413, 513) for cooking food, said lid being of the type suitable for resting on a free edge (13A, 113A, 213A, 313A, 413A) of said container, said lid comprising: a covering element (2, 102, 202, 302, 402, 502, 602), a shaped element (4, 104, 230, 330, 430, 530, 630) and connecting means (7, 106, 236, 336, 436, 636) suitable for connecting together said two elements, said shaped and covering elements are configured so as to allow them to move between: a first closure operating position of the lid, in which said two elements of the lid combine to close the cooking container on which the lid rests, and a second opening operating position of the lid, suitable for allowing venting of the container when the lid rests thereon and to prevent the escape from the container of cooking fluids; wherein said lid comprises at least one thermal actuator (10, 110, 210, 310, 410, 510, 610) suitable, on reaching a first pre-set temperature, for automatically moving the covering element with respect to the shaped element to bring the latter into said opening position, so as to allow venting of the container when the lid is placed upon it.