Graphite material application on heating tube

1. Heating tube - Graphite material

The graphite material is a customized PI (polyimide) film system. Through a specific process, the PI film is carbonized and graphitized at high temperature to obtain semi-finished foamed graphite with a thickness of about 200um. The last step needs to accurately control the thickness of the material around 180um by calendering; The thicker the graphite sheet, the smaller the density, the greater the resistivity to avoid the bad situation of "too hard broken, too soft twisted", the average density of the graphite sheet in this thickness range is 0.43g/cm3, and the average resistivity is 4.15×10-6Ω•m.

The graphite material can be used as a heating resistance to produce a certain amount of heat to achieve the heating function when passing the current. In order to better control its heating power and value, a special resistance structure is formed on the graphite sheet using the process of die-cutting or laser cutting. The specific resistance design model is shown in the figure. The graphite resistance is composed of N square unit resistors in the middle and clamping parts on both sides, and the unit resistors are connected in series to form a heating zone. The number of unit resistors can be increased or decreased according to the power and temperature requirements, and the design is flexible and convenient.

2. The application advantage of graphite in oven

1) The thermal response speed of graphite material is fast, the electric heating radiation conversion efficiency is high, do not need to be like the resistance wire heating tube heat first from the resistance wire to the insulation powder and then transferred to the metal tube surface and radiation energy around to achieve heating function, but directly in the form of thermal radiation through the quartz tube heat food;

2) The wavelength of infrared radiation of graphite materials is shorter, the radiation energy is higher, and the penetrability is stronger; As shown in Figure 6 of the Jiuyang home appliance test, the wavelength of infrared radiation of the graphite material is mainly concentrated in 3.5μm, while the wavelength of infrared radiation of the traditional heating tube is concentrated in 4.6μm, and the short-wavelength infrared radiation energy is higher and the penetration is stronger. Most of the food has a strong absorption effect in the wavelength range of about 3μm, it can be said that the graphite heating tube is better matched with the food, making the oven more energy efficient, food heating faster, and then lock in more nutrients and maintain the best taste.

3. DASEN Graphite heat pipe simulation test

Graphite heating tube in the exposed at room temperature, with FLUKE electric couple and infrared thermal imager E30 temperature measurement, transient heating, it takes 3 seconds to quickly warm up to 115.3℃, power at 817W, 15 seconds to quickly warm up to 300℃ above, power at 821W; If the heating tube is placed in a closed oven, with the internal reflection plate matrix design, to achieve uniform heat distribution, the conversion of thermal efficiency will be higher, the internal heating aging will be faster!

No preheating, 0.2 seconds rapid heating

Aladdin oven has the function of rapid heating without preheating, and its secret is the use of graphite heating material.

There is a graphite heating tube on the top of the oven, and the graphite has quite high thermal conductivity, which can achieve the effect of rapid heating.