1, electric heating tube heating
Electric heating pipes have been widely used in kitchen equipment such as rice cookers and water heaters. The electric heating tube is connected with a resistance wire at the electrodes at both ends of the metal tube, and the peripheral portion of the circumference is closely filled with crystalline magnesium oxide powder having heat resistance, thermal conductivity and insulation, generates heat after being energized, and conducts heat through the surrounding medium. The tubular heating element has the characteristics of simple structure, high mechanical strength, high thermal efficiency, safety and reliability, convenient installation and long service life.
2, induction cooker heating principle
The principle of induction cooker heating is to convert 50Hz alternating current into alternating current with working frequency of about 20kHz. AC power generates alternating magnetic field at the bottom of the pot, and eddy current is generated in the metal pot. The high-frequency eddy current rapidly conducts heat and heat, and realizes the conversion of electromagnetic energy to heat energy.
3, the principle of far infrared heating
Far infrared ray is an electromagnetic wave that conducts energy between red and invisible spectrum, so it is called far infrared ray and has a wavelength between 0.47 and 400 μm. When the far-infrared rays are irradiated onto the heated object, a small portion of the rays are reflected back, and most of them penetrate into the heated object, and are heated when the wavelength of the far-infrared rays emitted is the same as the absorption wavelength of the object to be heated. The molecules or atoms in the object absorb the far-infrared energy, generate intense vibration, rotate, and cause high-speed friction between the internal molecules and atoms, generating heat and raising the temperature, thereby achieving the purpose of heating.
The far-infrared heating does not require a heat transfer medium, and it has a strong penetrating ability. Compared with the conventional conduction mode, the far-infrared heating has the characteristics of simple heat conduction and high thermal efficiency. It can be grilled food, sterilized and disinfected, and has the advantages of quickness, hygiene, good quality and good taste.
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