Air circulation-type electric roaster
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Solution Overview
Problem
Conventional electric roasters have complex power supply systems, integrated heater and power units, and require numerous parts and wires, leading to manufacturing and maintenance challenges, as well as issues with air flow pressure balance and smell management.
Innovation Solution
An air circulation-type electric roaster design that separates power supply units for the cooking and air circulation systems, simplifies the power supply arrangement, and integrates a cooking unit with a centrally positioned through hole to stabilize air flow and reduce parts and wires, while using a detachable cover for the through hole to manage oil discharge and odor control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional electric roaster uses separate DC power supply for motor and AC power supply for heater with complicated circuit, then both motor and heater can be driven, but the power supply structure becomes complex and safety certification becomes difficult
Solution Approach 1:
The patent combines the motor and heater into a single integrated heating assembly where the motor drives a fan that circulates air heated by the heater element. This unified structure eliminates the need for separate power supply circuits, simplifying the overall power supply structure while maintaining the ability to drive both components simultaneously through a single power source.
Solution Approach 2:
The integrated heating assembly serves multiple functions: the motor drives air circulation, the heater provides heating, and together they create a convection system. This multi-functional design allows a single power supply to control both motor and heater operations, reducing circuit complexity while maintaining versatile functionality.
2Ease of manufacture
If heater and power supply are integrated in conventional electric roaster, then power delivery is direct, but the structure becomes complicated and inconvenient to use
Solution Approach 1:
The patent separates the heating assembly into a modular unit that includes the motor, fan, and heater element as an integrated but detachable component. This segmentation allows the heating unit to be manufactured as a complete assembly for efficient power delivery, while also enabling easy installation and removal by users, thus improving operational convenience without sacrificing manufacturing efficiency.
3Productivity
If cooking unit has multiple through holes for oil discharge and air flow, then air circulation is established, but the airflow pressure balance is disrupted
Solution Approach 1:
The patent positions the through hole centrally in the cooking unit and designs it with specific dimensions that optimize both oil discharge and air flow. The central location and controlled size create localized quality in the air flow pattern, allowing sufficient air circulation for productivity while maintaining pressure balance by avoiding excessive or poorly distributed openings.
4Stress or pressure
If air dispersing plate has side ventholes with different sizes and numbers, then pressure difference between outlet and inlet is adjusted, but the structure becomes complex
Solution Approach 1:
The patent employs asymmetric design in the air dispersing plate by positioning the single central through hole off-center relative to the air flow direction, and by creating asymmetric venthole patterns on different sides of the plate. This asymmetric configuration naturally creates the necessary pressure differences between inlet and outlet sides without requiring complex adjustments of multiple ventholes of varying sizes, thus achieving pressure control with simpler structure.
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 design allows for independent power supply to the cooking and air circulation units, reduces the number of parts and wires, stabilizes air flow pressure balance, and minimizes odor production by maintaining a consistent air flow, enhancing both manufacturing efficiency and user convenience.
Implementation Method 1
a heating unit (70) below the cooking unit (60) and configured to heat a lower surface of the cooking unit (60)
Implementation Method 2
an air circulation unit (40) below the air dispersing plate unit (50) and configured to circulate air in an interior space of the main body (10)
Data Source
AI summary
Air circulation-type electric roaster includes body, air dispersing plate unit mounted on the body and including bottom plate having at least one through hole and first and second side plates formed respectively on both sides of the bottom plate and each having a plurality of ventholes, power supply unit including first and second power supply units, heating unit including first power connecting unit connected to the first power supply unit, air circulation unit arranged inner side of first long side of the body along its longitudinal direction and including second power connecting unit connected to the second power supply unit, body connecting unit mounted on first short side of the body and including first connecting terminal connected to the second power connecting unit and contactable with the second power supply unit, and cooking unit above the heating unit including cooking surface heated by the heating unit.