Electric roasting machine
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Solution Overview
Problem
Current electric roasting machines have low heating efficiency and heat utilization rate as they only heat the side of the food facing the machine, resulting in incomplete cooking and inefficient energy use.
Innovation Solution
The electric roasting machine design includes a housing with a heating device and a grill that allows food to be roasted from multiple directions, with the grill's carrying part positioned to receive thermal radiation from the heating device, enhancing heat distribution to the upper, side, and lower surfaces of the food through a combination of radiation and airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the grill is positioned at the opening of the cavity, then the food can be easily accessed and removed, but the food cannot be heated from multiple directions resulting in low heating efficiency
Solution Approach 1:
The grill is designed to be movable between a first position at the opening of the cavity for easy food access and a second position extending into the cavity for multi-directional heating. This dynamic repositioning allows the system to switch between ease of operation and heating efficiency based on operational needs.
Solution Approach 2:
The grill can be extended into the cavity along the depth dimension, moving from a position at the opening to a position where food is surrounded by heating elements on multiple sides. This spatial repositioning enables thermal radiation to reach food from upper, side, and lower surfaces simultaneously.
2Device complexity
If only one heating device is used, then the device complexity is low, but the heat utilization rate is low because only one side of the food can be heated
Solution Approach 1:
The heating system utilizes the depth dimension of the cavity by positioning the heating device such that thermal radiation can reach the food from upper, side, and lower surfaces. This spatial arrangement of heating elements maximizes the utilization of thermal energy by exposing multiple surfaces of the food to heat simultaneously.
Solution Approach 2:
The system changes the spatial distribution parameters of heat delivery by positioning the heating device to radiate heat in multiple directions (upper, side, and lower surfaces). This parameter optimization increases the effective heat utilization rate without adding proportional complexity to the heating system.
3Productivity
If the carrying part is positioned close to the heating device, then the heating efficiency is improved, but the food may be exposed to excessive heat causing burning
Solution Approach 1:
The heating system provides non-uniform heat distribution with different intensities on different surfaces of the food. The upper, side, and lower surfaces receive heat from the heating device positioned in the cavity, creating localized heating zones that are optimized for cooking without causing uniform overheating and burning.
Solution Approach 2:
The grill's position is dynamically adjustable between extending into the cavity for high-efficiency heating and being at the opening for cooling and food access. This dynamic positioning allows the system to optimize heating efficiency while preventing food burning by controlling the duration and intensity of heat exposure.
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
This design significantly improves heating efficiency and heat utilization, ensuring even cooking and higher energy efficiency by heating all surfaces of the food simultaneously.
Implementation Method 1
Electric roasting machine roasts foods contactlessly by thermal radiation, in which the foods roasted would not be burnt
Implementation Method 2
the housing and the heating device cooperatively form an air passage, a wall of the air passage is provided with an air outlet communicated with the air passage
Data Source
AI summary
An electric roasting machine includes a housing defining a cavity having an upper opening, a heating device installed in the cavity, and a grill located at the opening of the cavity. The grill includes a carrying part extending into the cavity and located in a region covered by thermal radiation of the heating device.