Cooking device muffle for a cooking device and cooking device having a cooking device muffle
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Solution Overview
Problem
Existing cooking device muffles face challenges in ensuring explosion test suitability in a simple and robust manner, particularly for products destined for the North American market, without incurring high production costs or risking damage during explosion tests.
Innovation Solution
A cooking device muffle with a pressure compensation opening and a purely mechanical closing device that automatically opens and closes in response to explosion pressures, ensuring reliable explosion test suitability by dissipating pressure away from the cooking device's door.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure compensation opening is added to dissipate explosion pressure, then explosion test suitability is improved, but device complexity increases due to the need for a mechanical closing device
Solution Approach 1:
The mechanical closing device utilizes the pressure difference itself to automatically open and close the pressure compensation opening. When explosion pressure exceeds the spring force, the opening automatically opens; when pressure drops, the spring automatically closes it. This self-regulating mechanism eliminates the need for external control systems, sensors, or actuators, thereby improving explosion test suitability while avoiding excessive complexity.
Solution Approach 2:
The closing device changes its state based on pressure parameters. The spring force is calibrated to maintain closure at normal cooking chamber pressures but allows opening when explosion pressure thresholds are exceeded. This parameter-based control enables the system to automatically respond to pressure changes without complex control logic.
2Ease of manufacture
If a mechanical closing device is used to seal the pressure compensation opening, then manufacturing costs are reduced, but reliability may worsen due to potential mechanical failure
Solution Approach 1:
The spring element is pre-loaded to provide continuous sealing force on the closure cover. This beforehand cushioning ensures that the sealing surface maintains constant contact pressure, compensating for any minor dimensional variations or wear in the mechanical components. The spring acts as a cushion that maintains sealing reliability while using simple, manufacturable parts.
Solution Approach 2:
The closure cover is designed as a flexible element that can deform to conform to the sealing surface. This flexibility compensates for manufacturing tolerances and wear in the rigid housing, maintaining reliable sealing without requiring extremely precise machining. The flexible closure cover enhances sealing reliability while keeping the overall device simple and cost-effective to manufacture.
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 enables efficient and cost-effective explosion test suitability, preventing damage to the cooking device by automatically managing explosion pressures, thus ensuring robust and economical manufacturing.
Implementation Method 1
a closure cover (16) fastened to a remainder of the cooking device muffle (4) for closing the pressure compensation opening (12) in the normal state of the cooking device muffle (4)
Implementation Method 2
a pressure compensation opening (12) arranged in one cooking chamber wall (10) of the at least one cooking chamber wall (10) for dissipating an explosion pressure generated during an explosion test
Data Source
AI summary
A cooking device muffle for a cooking device includes: a cooking chamber having a cooking chamber opening tightly closable by a door of the cooking device, and at least one cooking chamber wall for delimiting the cooking chamber. The cooking device muffle is suitable for explosion testing. A pressure compensation opening is arranged in one cooking chamber wall of the at least one cooking chamber wall to dissipate an explosion pressure generated during an explosion test, the pressure compensation opening being tightly closed by a purely mechanical closing device of the cooking device muffle in a normal state of the cooking device muffle, in which a cooking chamber pressure lower than the explosion pressure prevails in the cooking device muffle. The closing device automatically opens the pressure compensation opening at a cooking chamber pressure greater than or equal to the explosion pressure and automatically tightly closes the pressure compensation opening.