Microwave energy as a clean and efficient energy is widely used in the food industry. In the process of food defrosting, the method to improve the effect of microwave action is to increase the carousel or mode stirrer, etc. The carousel mode is the mainstream defrosting method in the market at present, but the defrosting effect is different for different meats, which lacks specificity. Considering that adding a mode stirrer in the microwave cavity can significantly improve the defrosting effect, but also facilitates the control of the mode stirrer to achieve targeted defrosting of different meats, this paper, through the combination of microwave defrosting technology and intelligent control technology, designs a household intelligent microwave defrosting machine that can identify the type of boxed meat through the barcode and intelligently feed back the optimal mode stirring parameters, in order to achieve uniformity, efficient and convenient defrosting.
KEYWORDS: Waveguides, Microwave radiation, Electromagnetism, Temperature distribution, Design, Electric fields, Temperature metrology, Mathematical optimization, Reflection, Free space
Improving the uniformity of electromagnetic field and temperature in the resonant cavity is a hot issue in microwave heating. In this study, a new method for the design of slot waveguides applied to microwave heating is proposed, which is based on Taylor synthesis method and multi-physics calculations. The initial length, width, and offset between the centerline of the slot are designed by Taylor synthesis method, and the spacing between two slots, including the number of slots, is also determined by Taylor synthesis method. Subsequently, by combining electromagnetic fields, temperature fields, and specific characteristics of the heated object, multi-physics calculations are performed, and the above parameters are further optimized to design the slot waveguides. The results show that the slot waveguides designed by the proposed method produces a more uniform temperature and electromagnetic field distribution than the conventional method.
At present, smoke alarms have the disadvantages of not being able to send accurate fire positioning information in time and low reliability. In this study, a self-contained smoke alarm with dual-mode positioning function, high-precision smoke particle detection and rapid response is designed. The MC20 chip with integrated positioning and communication module is used to provide accurate positioning data and send alarm information in time.A composite smoke detection module with high-precision ion smoke sensor and photoelectric smoke sensor as the core is designed to improve the detection accuracy of smoke particles and reduce the rate of false alarm. Making a phone call and sending SMS at the same time are used as alarm method. The contents of the SMS are the positioning data and positioning link of the destination, and the link can directly jump to the terminal navigation map.
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