Polygonal-type filament and production process as well as heating tube and microwave oven with polygonal-type filament

Abstract

The invention relates to a polygonal-type filament and production process as well as a heating tube and a microwave oven with the polygonal-type filament. The polygonal-type filament is characterized in that a flaky filament is made into a square-wave polygonal structure with four inflection points on each period. The production process comprises steps of setting, vapor deposition treatment and impurity removal. The heating tube is characterized in that the flaky filament of the square-wave polygonal-type structure is arranged in a glass tube. The microwave oven is a microwave oven adopting the heating tube with the polygonal-type filament. The resistance and the power density are controlled by controlling the width of a polygonal line and the distance among the polygonal lines, the spark rate in the microwave oven can reach zero without additionally providing a shielding screen, the efficiency of the microwave oven is greatly increased, the manufacturing cost is greatly reduced, the rotation of a sheet holding-roasting tube caused by elongation can be effectively prevented in the heating, the temperature resistance is stable, the power is stable, the structure is simple, convenience in machining is realized, the power is easy to control through the change of the resistance, and the cost of raw materials can be reduced by 70 percent.

Description

technical field [0001] The invention relates to a microwave oven. In particular, it relates to a broken-line filament which controls the resistance and power density of a heating tube by adjusting the width of the filament and the distance of the broken line, its manufacturing process, a heating tube and a microwave oven with the filament. Background technique [0002] Generally speaking, a microwave oven is a machine that cooks food conveniently by turning on the power supply and using the microwave effect generated. In particular, recently, heating sources such as heaters have been installed in addition to magnetrons, and various cooking methods have emerged, that is, cooking methods that circulate the heat generated in the heaters, or cooking by controlling the position of the heaters. method etc. [0003] Such as figure 1 As shown, the existing microwave oven with barbecue is generally composed of the following components: a furnace body 700, which embraces the outsid...

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Problems solved by technology

[0009] Mesh and spiral barbecue tubes have sparking phenomenon in the microwave field, so when they are applied to microwave ovens, additional shielding nets are required, which reduces the efficiency of microwave ovens by about 20%, and at the same time increases costs

[0010] Although the ignition rate of the spiral type and mesh type (under microwave conditions) is higher than that of the sheet type, the resistance of the sheet type barbecue tube varies greatly with temperature (voltage), and the power is unstable. In order to achieve good electrical characteristics ( Resistance), usually by vapor deposition to adjust the resistance value of carbon sheet, its production process is more complicated, including six steps of weaving, shaping, primary heat treatment, secondary heat treatment, hydrogen reduction treatment and cutting, resulting in relatively high cost high

[0011] At present, the carbon sheet structure of the carbon sheet heating tube is completely homogeneous. Using the electrical edge effect, it can be known that the axial uniformity (temperature) of the heating tube is relatively uneven, that is, the middle temperature is high, and the temperature at both ends is low, which affects The effect of cooking

[0012] Moreover, the current control of the power of the carbon sheet is achieved by adjusting the resistance. If the overall size (length, width, and thickness) of the carbon sheet cannot be changed, the resistance can only be reduced by a process similar to CVD (vapor phase deposition). instead of raising the resistance

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