Microwave heating plate and chamber and method for manufacturing same

Abstract

The invention relates to a microwave heating plate and chamber and a method for manufacturing the same, which belong to the technical field of microwave heating. The microwave heating plate and chamber consists of a microwave absorbing component, ceramic fibers with excellent wave-transmitting property, an inorganic binder, an organic binder and an additive and is characterized in that the weight ratio of the five components sequentially is 40-80: 10-50:7-30:0-1.5:1-15. The method for manufacturing the microwave heating plate and chamber comprises the following steps: firstly, using the microwave absorbing component and the ceramic fibers as a substrate, adding the inorganic binder, the organic binder, the additive and water into the substrate, and fully stirring and mixing materials to prepare slurry; and secondly, producing the microwave heating plate and the chamber in required size and shape, namely wet blanks, by using a mechanical extruding mould forming method or a manual mould forming method. The microwave heating plate and chamber has the advantages of simple structure, low cost, long service life, high thermal efficiency, high safety due to non-contact heating, energy conservation, and applicability to laboratory heating and large-scale industrial heating at high, medium and low temperatures.

Description

technical field [0001] The invention belongs to the technical field of microwave heating, and in particular relates to a microwave heating plate, a heating cavity and a manufacturing method thereof. Background technique [0002] At present, microwave energy, as a new type of heat source, has been increasingly used in heating fields, such as: food, paper, wood, sintering and so on. The microwaves used in actual heating are usually electromagnetic waves with frequencies of 915MHz and 2450MHz. The simple principle of microwave heating is that the polarization of the alternating electromagnetic field causes the free charges inside the material to rearrange and the dipoles to rotate repeatedly, resulting in strong vibration and friction. In this microscopic process, the alternating electromagnetic field The energy is converted into heat energy in the medium, which causes the temperature of the medium to rise. Therefore, microwave heating is the self-heating of the dielectric mat...

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Problems solved by technology

[0003] However, the ability of a substance to absorb microwave energy is related to the complex dielectric constant of the substance, that is, the larger the loss factor, the stronger the ability to absorb microwave energy. Therefore, microwave heating has strong selectivity, that is, microwave is suitable for heating microwave-absorbing materials. Such as: SiC, carbon, ferrite, water, AlN, some semiconductor ceramics and cermets, metal micropowder, etc., while microwaves cannot directly heat bulk metal materials, because metals reflect microwaves; microwaves are also difficult to heat many insulators Materials, such as: glass, plastic (such as: polyethylene, polystyrene, etc.), quartz and some ceramic materials, because these materials are "transparent" to microwaves, they do not absorb or absorb microwave energy less; microwaves are more difficult to Heats most gases and liquids because they are more "transparent" to microwaves, so microwave heating of these materials will be inefficient

[0004] The traditional heating method is generally to generate heat through the heating element resistance wire, silicon carbon rod, or silicon molybdenum rod, and then indirectly heat the material through heat transfer, so it belongs to external heating. This heating method generally has no selectivity for the material to be heated. , but there are the following deficiencies: (1) the heating area of ​​the heating element is small, the thermal efficiency is low, the heating speed is slow, and the heating uniformity is poor; (2) the resistance wire, silicon carbide rod and silicon molybdenum rod are easy to break, so the service life is relatively low ; (3) The heating chamber is fixed and difficult to replace. Therefore, when heating small-sized materials, the size of the heating chamber will be too large, that is, a large horse-drawn cart, resulting in energy waste