Microwave and heating element combined heating type heating chamber and manufacturing method thereof

Abstract

The invention discloses a microwave and heating element combined heating type heating chamber and a manufacturing method thereof, which belong to the technical field of microwave heating. The microwave and heating element combined heating type heating chamber consists of wave absorbing and heating elements, a heating element carrying plate and a thermal insulation layer with excellent wave-transmitting property. The manufacturing method comprises the steps of embedding and fixing the wave absorbing and heating elements of the same shape and size on the heating element carrying plate and coating the thermal insulation layer on the sides, against the heating element carrying plate, of the heating elements. The microwave and heating element combined heating type heating chamber smartly realizes mixed heating in two modes of microwave heating and heating element heating and allows the heating powers of the two modes to adjust automatically or manually, thereby overcoming the drawbacks of pure microwave heating and pure conventional heating element heating, having the advantages of large heating area, high thermal efficiency (internal and external synchronous material heating), even heating, low manufacturing cost, long service life, easy replacement, and convenient maintenance and repair, and realizing super-fast and ultra-temperature heating, excellent energy conservation effect and remarkable economic benefits.

Description

technical field [0001] The invention relates to a heating chamber, in particular to a heating chamber of a microwave and heating element mixed heating type and a preparation method thereof, belonging 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, microwave hea...

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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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