Circular Hot Air Rack Oven Chamber for Even Heat Distribution
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Solution Overview
Problem
Conventional hot air rack ovens experience temperature gradients leading to uneven cooking due to rectangular oven chambers, despite the use of rotating racks.
Innovation Solution
A hot air rack oven with a circular cross-section oven chamber and a curved sliding door, allowing for unobstructed hot air flow and even heat transfer, reducing the oven chamber volume and footprint, and facilitating easier access and safer operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rectangular oven chamber is used, then the rack can be easily introduced and removed, but temperature gradients occur leading to uneven cooking
Solution Approach 1:
The patent applies curvature by changing the oven chamber cross-section from rectangular to circular. The chamber wall includes curved portions that form a circular cross-section, allowing hot air to flow uniformly around the rotating rack from all directions (360°), eliminating temperature gradients and ensuring even cooking while maintaining ease of rack access and removal
2Manufacturing precision
If a circular cross-section oven chamber is used, then even heat distribution is achieved, but the door mechanism becomes more complex
Solution Approach 1:
The door is designed with a curved cross-section matching the circular chamber, and the door edge is rounded to conform to the circular geometry. This curved door design, while geometrically more complex, enables the door to slide laterally along curved guides and seal properly against the circular chamber opening, maintaining heat distribution uniformity while providing a functional access mechanism
3Device complexity
If a conventional rectangular door is used, then the door structure is simple, but the rack access is more difficult and burn risk increases
Solution Approach 1:
The curved door with rounded edge allows the door to slide laterally along the circular chamber opening, positioning the rack closer to the opening for easier access. The curved geometry provides a more ergonomic opening path that reduces operator exposure to hot air and steam, thereby lowering burn risk while maintaining structural integrity
4Ease of manufacture
If a rectangular oven chamber is used, then the construction is straightforward, but the oven chamber volume is larger for the same rack size
Solution Approach 1:
The circular cross-section chamber with curved portions allows the hot air to flow uniformly around the rack from all directions, maximizing the utilization of the chamber volume. This geometry reduces the overall chamber volume required for the same rack size compared to a rectangular chamber, as the circular shape eliminates wasted corner spaces and optimizes the heating zone
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 circular cross-section ensures even heat distribution from top to bottom and edge to center of the baking tray, improving energy efficiency and reducing the risk of burns during operation, while minimizing material usage and floor space.
Implementation Method 1
Hot air can be introduced via one or two corner vents into the oven chamber to bake the goods. This leads to a temperature gradient across the oven chamber
Implementation Method 2
the door is curved with essentially the same diameter D as the oven chamber, and is able to slide laterally to one side of the opening
Data Source
AI summary
Rack oven for baking good on a rack inside an oven chamber, wherein the oven chamber wall has one or more curved portions which are curved around a substantially vertical axis and the total angle subtended by the one or more curved portions is more than 80° and less than 300° of the perimeter of the chamber.