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Heating unit of infrared electric heating plate and producing method

A heating element and electric heater technology, applied in the direction of electric heating devices, ohmic resistance heating, electrical components, etc., can solve the problems of low efficiency of infrared radiation energy, energy loss, etc., to increase the radiation area, high energy conversion efficiency, and improve heating efficiency Effect

Inactive Publication Date: 2008-07-02
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from its working principle that heat energy can only be transferred to the infrared coating through the substrate. This method is easy to cause energy loss, and usually first converts electrical energy into heat energy, which is converted from electricity to heat, and then from heat to infrared radiation. Therefore Inefficient conversion of electrical energy into infrared radiation

Method used

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  • Heating unit of infrared electric heating plate and producing method
  • Heating unit of infrared electric heating plate and producing method
  • Heating unit of infrared electric heating plate and producing method

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preparation example Construction

[0023] The preparation process of the infrared heating element heating element of the present invention is as follows:

[0024] 1. Preparation of infrared heater precursor

[0025] When thermosetting resin is used as adhesive, heat curing method is used: first, make a uniform mixture of conductive material and thermal conductive material in a mixer, then add it to the adhesive being stirred, after stirring evenly, add toughening agent , continue stirring to form a homogeneous mixture. The above mixture is made into a thin sheet on a twin-roll machine, and then solidified on a flat vulcanizer at 65-150° C. for 0.5-5 hours, and cooled naturally to room temperature to obtain an infrared heater precursor.

[0026] When using thermoplastic resin, use hot pressing method: first make a uniform mixture of conductive material and heat conductive material in a mixer, then add it to the adhesive, and after stirring evenly, add a toughening agent and continue stirring to make a uniform m...

Embodiment 1

[0029] Embodiment 1 flake graphite (particle size is 45 μ m), silicon carbide (particle size is 15 μ m), epoxy resin, ethanol is 2.5: 88: 7.5: 2 mix homogeneously according to weight ratio, after making 1mm flake on the two-roller machine, on flat plate Heat and solidify at 65°C on a vulcanizer for 3 hours, and cool naturally to room temperature to obtain the precursor of the infrared heater. The infrared heater precursor was carbonized at 900° C. for 6 hours under a nitrogen atmosphere to obtain an infrared heater heater. The maximum spectral radiance of the surface measured by infrared emission spectroscopy is 0.49w / cm 2 / sr / m, the corresponding wavelength is 2.41μm, and the maximum radiation temperature of the heating element of the infrared heater is 929.3℃ (see figure 2 ).

Embodiment 2

[0030] Example 2 Conductive carbon black (particle size is 20mm), silicon dioxide (particle size is 25 μm), ABS resin and glycerol are mixed uniformly by weight 3: 14: 2: 1, then on a flat vulcanizer, heat under 300 ℃ and 15MPa Press for 15 minutes to make a hot-pressed sheet with a thickness of 1 mm, and cool it down to room temperature naturally to obtain an infrared heater precursor. The infrared heater precursor was carbonized at 1000° C. for 9 hours under an argon atmosphere to obtain an infrared heater heater. The maximum spectral radiance of the surface measured by infrared emission spectroscopy is 1.05w / cm 2 / sr / m, the corresponding wavelength is 2.37μm, and the maximum radiation temperature of the heating element of the infrared heater is 949.6°C (see image 3 ).

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Abstract

The invention relates to a heating unit of an infrared electric hot plate and a preparation method thereof. The infrared electric hot plate is made up of conductive material ranging from 1 percent to 30 percent, heat conduction material ranging from 30 percent to 92 percent, polymer adhesive ranging from 5 percent to 50 percent and toughener ranging from 2 percent to 10 percent.The preparation method is as followings: the front part of the heating unit is made through thermofixation or hot press molding, then under the protection of nitrogen or inert gas, the front part is carbonized for 3 to 12 hours at a high temperature ranging from 900 DEG C to 2200 DEGC, thus obtaining the heating unit of an infrared electric hot plate. The preparation is simple with low cost.The infrared electric hot plate, using 6-380V alternating or direct currents, can directly produce infrared radiation with high efficiency of energy conversion. Being a heating unit, the infrared electric hot plate can produce infrared radiation both on the upper surface and the lower surface dispensing with a substrate, which greatly increases radiation area and improves heating efficiency. As a novel infrared heating unit material, the invention not only can be extensively applied to technics such as heating, baking and heat treatment in agriculture and industry, but also can be applied to medical care and heating in winter, etc., with important application value and extensive application prospect.

Description

Technical field: [0001] The invention relates to the composition and preparation technology of the heating element material of the functional infrared electric heating sheet, in particular to the composition and preparation method of the heating element material of the infrared electric heating sheet with integral conductive radiation infrared rays. Background technique: [0002] With the massive consumption of fossil energy by human beings, the reserves of fossil energy are depleted day by day, and the environmental pollution is becoming more and more serious. There is an urgent need for a clean heating method that can use energy efficiently. Infrared heating technology is a new achievement in the field of heating technology in recent years. Infrared light source has high energy conversion rate, the wavelength of radiation is suitable for absorption by objects, high power, safety and fire prevention, so infrared radiation heating technology is an ideal energy utilization me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B3/12H05B3/20
Inventor 英哲白朔杜金红李峰成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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