Energy-saving easily-changeable high-temperature microwave heating chamber and manufacturing method thereof

Abstract

The invention relates to an energy-saving easily-changeable high-temperature microwave heating chamber and a manufacturing method thereof, which belong to the technical field of microwave high-temperature heating technology. The energy-saving easily-changeable high-temperature microwave heating chamber mainly comprises the following functional layers: an internal high-temperature microwave absorbing coating, a medium high-temperature wave-transmitting thermal insulating layer and an external wave-transmitting hardened layer. The manufacturing method is characterized by comprising the following steps: firstly, mixing a microwave absorbing component and water glass and / or commercial high-temperature glue (mud) to prepare slurry; secondly, uniformly coating the slurry on the high-temperature wave-transmitting thermal insulating layer to form a chamber internal surface in a certain shape; and finally, obtaining the energy-saving easily-changeable high-temperature microwave heating chamber by drying and preburning. The energy-saving easily-changeable high-temperature microwave heating chamber has the advantages of simple structure, easy change, low cost, large heating area, high thermal efficiency, convenient maintenance, high safety due to non-contact heating, supper-fast and ultra-temperature heating, and remarkable energy conservation effect and obvious economic benefits due to the selection because of the changing and using of heating chambers of various sizes according to the sizes of materials to be heated.

Description

technical field [0001] The invention relates to a heating cavity, in particular to an energy-saving easily replaceable high-temperature microwave heating cavity and a manufacturing method thereof, which belong to the technical field of microwave heating. 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, mic...

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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

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