Pressure Cooker Gasket Lip Notches for Controlled Steam Release
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Solution Overview
Problem
Existing pressure cooker sealing gaskets suffer from sudden steam discharge, damage, reduced reliability, and complex manufacturing due to peripheral recesses and sudden deformation, leading to safety and ergonomic issues.
Innovation Solution
A sealing gasket with a lip featuring an escape window that moves relative to the heel, allowing for a controlled, gradual transition from sealing to leakage configuration when pressure exceeds a threshold, avoiding deformation of the heel and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If peripheral recesses are provided in the heel of the gasket to enable deformation for safety function, then operating safety is improved, but the gasket reliability is reduced due to local weakening and risk of breaking
Solution Approach 1:
The invention extracts the deformation function from the heel of the gasket and relocates it to a separate safety element (such as a rupture disc or relief valve) that can be positioned independently. This allows the heel to maintain its full structural integrity and reliability while the safety function is performed by the extracted element, eliminating the local weakening caused by peripheral recesses.
Solution Approach 2:
The invention segments the gasket system into distinct functional components: the sealing function is performed by the gasket body, while the safety function is performed by a separate safety element. This segmentation allows each component to be optimized for its specific function without compromising the other, ensuring both reliability and safety.
2Reliability
If the lip tips over the top of the rim suddenly to break sealing, then safety function is achieved, but severe and irremediable damage occurs to the gasket requiring replacement
Solution Approach 1:
The invention incorporates a safety element that activates before the gasket is damaged, providing a cushioning effect that prevents the sudden tipping over of the lip. The safety element (such as a rupture disc) fails in a controlled manner at a predetermined pressure, gradually releasing steam and preventing the catastrophic failure that would otherwise occur.
Solution Approach 2:
The invention converts the potential harm of sudden steam discharge into a beneficial controlled release mechanism. The safety element is designed to fail in a predictable and controlled manner, transforming the harmful sudden discharge into a gradual, manageable release that protects both the user and the gasket.
3Ease of manufacture
If peripheral recesses are provided for safety deformation, then safety function is enabled, but manufacturing complexity increases and assembly requires particular care
Solution Approach 1:
The invention extracts the safety function from the gasket manufacturing process and implements it as a separate safety element. This eliminates the need to create peripheral recesses in the heel during gasket manufacturing, simplifying the manufacturing process while maintaining safety functionality through the separate element.
Solution Approach 2:
The invention combines the gasket and safety element into a single integrated system that is pre-assembled or pre-positioned. This merging eliminates the need for complex assembly procedures and ensures proper positioning without requiring keying or indexing means, as the safety element is designed to work seamlessly with the gasket in a standardized configuration.
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 provides a safer, more reliable, and longer-lasting sealing gasket with controlled pressure release, preventing sudden steam discharge and damage, while simplifying manufacturing and assembly processes.
Implementation Method 1
the first lip forms a differential movement member designed to enable the escape window to effect a relative movement relative to the heel when the pressure prevailing inside the cooking enclosure exceeds a predetermined threshold PS
Data Source
AI summary
Provided is a sealing gasket for a cooking utensil for cooking food under pressure, the utensil includes a vessel and a lid that define a cooking enclosure. The gasket having a heel from which at least a first lip projects that is provided with at least one escape window notch that passes through its thickness, and in that the first lip forms a differential movement member enabling the escape window notch to effect a relative movement relative to the heel when the pressure prevailing inside the cooking enclosure exceeds a predetermined threshold, which relative movement enables said escape window notch to open up a leakage orifice via which the cooking enclosure is put into communication with the outside of the utensil. Cooking utensils for cooking food under pressure such as a pressure cooker are provided.