Microwave heating temperature field control method based on time-varying electromagnetic field
A technology of microwave heating and control method, which is applied in microwave heating temperature field control based on time-varying electromagnetic field, microwave heating temperature field control field, can solve problems such as uneven temperature field on the surface of parts, and achieve the effect of improving temperature uniformity
Active Publication Date: 2018-08-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
[0005] The purpose of the present invention is to invent a microwave heating temperature field control method based on a time-varying electromagnetic field to solve the problem of uneven temperature field on the surface of parts in microwave heating technology
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[0016] The present invention will be further described below in conjunction with embodiment.
[0017] This embodiment adopts chopped carbon fiber felt / epoxy resin composite flat plate (length 250mm, width 250mm, thickness 2mm) as the heated part; adopts an octagonal high-performance industrial microwave oven with 16 microwave sources as the heating equipment, each The rated power of the microwave source is 800W; a 20-channel fluorescent optical fiber temperature measurement system is used to measure the surface temperature of the composite material in real time; the LabVIEW program is used as the control software to regulate the power of the 16-channel microwave source.
[0018] Put the heated part into the microwave cavity, place and fix 20 fluorescent optical fiber sensors evenly on the surface of the part, and use the average temperature measured by the 20 fluorescent optical fiber sensors as the control signal for adjusting the power of each microwave source. Turn on the m...
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The invention relates to a microwave heating temperature field control method based on time-varying electromagnetic field. The microwave heating temperature field control method is characterized by the following features: for industrial microwave heating systems with multiple microwave sources, the power of each microwave source is controlled in real time and randomly so that each microwave sourceoperates at different power at any time, a large number of constantly changing electromagnetic field resonance modes are formed in the microwave cavity, and the temperature uniformity of the surfaceof the heated part is improved by using a random compensation effect between a large amount of electromagnetic field resonance modes in a period of time. The microwave heating temperature field control method obviously improves the temperature uniformity of the heated part in the microwave heating process.
Description
technical field [0001] The invention relates to a temperature field control method, in particular to a microwave heating temperature field control method, in particular to a microwave heating temperature field control method based on a time-varying electromagnetic field. Background technique [0002] Microwave is an electromagnetic wave with a frequency of 300M to 300GHz. The principle of microwave heating is that the high-frequency changing electromagnetic field makes the polar molecules in the material move repeatedly at high frequency, and violent friction occurs between the molecules to convert microwave energy into heat energy. Based on the above heating mechanism, microwave heating has a series of advantages such as fast heating speed, small temperature gradient in the thickness direction of parts, selective heating, and easy control, so it is widely used in various fields such as food processing, material processing, and chemical synthesis. [0003] However, microwave...
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Login to View More IPC IPC(8): H05B6/68
CPCH05B6/68
Inventor 李迎光周靖
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS