Flat thin plate type far infrared radiation heating panel

Abstract

The flat thin plate type far infrared radiation heating plate of the present invention belongs to the technical field of electric heating devices. The present invention proposes a flat thin plate type far infrared radiation heating plate with an operating temperature in the range of 50°C to 800°C and a preparation method thereof. It can be realized by the following scheme: a heating core disc woven into a flat shape with filament carbon fiber according to different numbers of warp and weft strands is clamped on both sides with microcrystalline glass or quartz glass, a transmission glass panel is used for the radiation surface on the top, and a reflection glass panel is used on the bottom. The surrounding is sealed with glass powder by high temperature melting and hot pressing or sealed with high temperature resistant colloid and electrode wire joints are led out. The cavity is filled with inert gas, and the bottom of the reflector is lined with a nano-microporous insulation board, which is encapsulated with a metal shell. The far infrared radiation heating plate has a compact structure, safe and reliable operation, and is easy to install. It can be applied to flat electric frying pans, far infrared radiation heating plates for household electric ovens, and far infrared radiation heating plates for all-glass electric kettles.

Description

Technical Field

[0001] The invention belongs to the technical field of electric heating devices, and in particular relates to a flat thin plate type far-infrared radiation heating plate for cooking utensils. Background Art

[0002] Existing electric heating devices generally use metal wire electric heating elements to generate heat, such as nickel-chromium alloy, molybdenum wire, tungsten wire, etc. However, general metal heating wires are easily oxidized when heated at high temperatures, have low strength at high temperatures, and the components are deformed, easily punctured, and difficult to repair. Carbon fiber is an emerging pure black body electric heating material with an electric heat conversion efficiency of more than 95%, which is 30% more energy-efficient than heaters using nickel-chromium, tungsten-molybdenum and other materials as heating elements. At the same power, the radiation temperature is 30°C higher than that of nickel-chromium metal electric heating tubes and 15°C higher than that of tungsten-molybdenum wire quartz electric heating tubes.

[0003] Existing carbon fiber heaters are usually made into carbon fiber quartz heating tubes, which include a quartz tube body. The two ends of the quartz tube body are flattened to form pressure heads, which seal the two ends of the quartz tube body. The sealed quartz tube body is filled with inert gas. Carbon fiber heating wires, electrodes connected to the two ends of the carbon fiber heating wires, and molybdenum rods connected to the other ends of the two electrodes are respectively arranged in the sealed quartz tube body. The other ends of the two molybdenum rods are connected to external wires through molybdenum sheets arranged in the two pressure heads. The carbon fiber heating wires are arranged in the heating area of ​​the quartz tube body, and the electrodes and molybdenum rods are arranged in the cooling area of ​​the quartz tube body. The heating plate made of carbon fiber quartz tube cannot be made into a flat thin plate type heating plate due to the limitation of the tube diameter. The heating plate made of carbon fiber quartz tube bending has low overall strength and is easy to break and fail, which brings troubles to the transportation and installation of the product.

[0004] Utility Model Application 201120034101.2 is a highly efficient multifunctional infrared radiator. By reading paragraph 0027 of the specification of the patent application, it can be seen that the heating element uses an electric heating tube, or more precisely, an electric heating wire as a heat source. Since the temperature of the electric heating wire is high when it is heated, multi-layer insulation and heat preservation are required, and the selection of related components also puts forward higher requirements for temperature resistance and fire resistance. The infrared radiation board of the above patent uses aluminum profiles as the substrate. The operating temperature is limited by the melting point of aluminum. The operating temperature will be limited to below 350°C, and the power density is not high, which limits its use.

[0005] Usually, the radiation panel must be made into a single-sided radiation, and the back side needs to be insulated. The choice of insulation material under the high-temperature working state of the radiation panel becomes an important issue affecting the practicality of the radiation panel. If the insulation layer is too thick, the finished radiation panel will be too large and inconvenient to use. Nanoporous thermal insulation material is a new material made using the latest high-tech technology. It is formed by inorganic nano-scale refractory powder through a special process to form tiny nano-scale pores. Its thermal conductivity is smaller than that of still air. At high temperatures, its thermal insulation performance is 3 to 4 times better than that of traditional fiber-type thermal insulation materials. It is the thermal insulation material with the best thermal insulation performance to date. Summary of the invention

[0006] The purpose of the present invention is to provide a flat thin plate far-infrared radiation heating plate which can adjust the working temperature in the range of 50°C to 800°C, has rapid heating, energy-saving and high efficiency, simple electrical control, compact structure, safe and reliable, and is easy to produce and install.

[0007] The present invention can be implemented through the following scheme: a preparation method of a flat thin plate type far-infrared radiation heating plate, first using filament carbon fiber according to a set pattern and appearance using an integral weaving technology to weave a flat far-infrared radiation core disk with a certain resistance value, the two sides are clamped with microcrystalline glass or quartz glass, the front side is a radiation surface using a transmission glass panel, the back side is a reflective plate composed of a quartz glass or ceramic plate with an insulating reflective layer, the surrounding is sealed with glass powder melting or sealed with a high-temperature resistant colloid and an electrode wire connector is led out, the interior is filled with inert gas, and then it is packaged with a shell stamped from a metal sheet.

[0008] The flat thin plate far-infrared radiation heating plate made according to the preparation method of the present invention has stable electric heating power, uniform radiation heating and high efficiency. The heating core disc woven with carbon fiber heats up rapidly during operation, and the far infrared rays pass through the transmission plate to radiate and heat the target. The inert gas in the sealed cavity can prevent the carbon fiber from being damaged by high-temperature oxidation, thereby ensuring the service life of the far-infrared radiation heating plate. The product manufactured according to the method of the present invention has the advantages of good power consistency, high radiation heating efficiency, good thermal balance, and long service life. The finished radiation plate is highly safe and not easily damaged during transportation and installation. It is suitable for flat electric frying pans, far-infrared radiation heating plates for household electric ovens, and far-infrared radiation heating plates for all-glass electric kettles. Wide promotion and application can produce good social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the assembly structure of an embodiment of the present invention.

[0010] Figure 2 It is a schematic structural diagram of a far-infrared radiation core disk according to an embodiment of the present invention.

[0011] Figure 3 This is a finished product structure effect diagram of an embodiment of the present invention.

[0012] Figure 4 This is a schematic diagram of the structure of a far-infrared radiation core disk according to another embodiment of the present invention.

[0013] Figure 5 A cross-sectional view and a partially enlarged schematic view of another embodiment of the present invention.

[0014] Figure 6 This is a finished product structure effect diagram of another embodiment of the present invention.

[0015] In the figure: 1 is the upper cover of the shell, 2 is the transmission plate, 3 is the far-infrared radiation core disk, 3.1 is the electrode joint 1, 3.2 is the electrode joint 2, 4 is the sealing rubber ring, 5 is the reflection plate 1, 6 is the heat insulation reflection layer, and 7 is the lower body of the shell. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described in detail in combination with the embodiments with reference to the accompanying drawings.

[0017] See also Figure 1 The flat thin plate type far-infrared radiation heating plate of the present invention and the preparation method thereof comprise an outer shell upper cover (1), a transmission plate (2), a far-infrared radiation core disc (3), a sealing rubber ring (4), a reflective plate (5), a heat insulation reflective layer (6), and an outer shell lower body (7).

[0018] Example 1: See Figure 2 , using filament carbon fiber according to different numbers of warp and weft strands to weave into a rectangular far-infrared radiation core disk (3) with a length of 300 mm and a width of 200 mm, with molybdenum sheets connecting both ends as electrodes, and the thickness of the radiation core is about 0.5 mm, see Figure 1 , a quartz glass plate with a thickness of 3mm is cut into a rectangular transmission plate (2) with a length of 320mm and a width of 220mm and a reflector plate composed of a reflector plate 1 (5) and a heat-insulating reflective layer (6) underneath, and a far-infrared radiation core disk (3) is sandwiched in the middle. The surrounding is sealed with a high-temperature resistant colloid (4), and the interior is filled with an inert gas, and a molybdenum sheet electrode connector (3.1) is led out. The reflector plate is composed of a reflector plate 1 (5) with a bottom pad of 10mm thick and a heat-insulating reflective layer (6) pressed with nano-microporous material. Then, the radiation heating plate is encapsulated with an outer shell upper cover (1) and an outer shell lower body (7) stamped out of a 0.5mm metal sheet to produce a far-infrared radiation heating plate with a size of 322 x 222x18 (mm), 220V / AC, and 1800W, see Figure 3 .

[0019] Example 2: See Figure 4, using filament carbon fiber according to different numbers of warp and weft strands to weave into a circular far-infrared radiation core disk (3) with an outer diameter of 120 mm and an inner diameter of 30 mm, see Figure 5 , a quartz glass plate with a thickness of 3 mm is cut into a transmission plate (2) and a reflection plate (5) with a diameter of 130 mm, and a far-infrared radiation core disc (3) is sandwiched in the middle. The periphery is sealed by high-temperature flame melting and hot pressing or sealed with a high-temperature resistant colloid (4). The interior is filled with inert gas, and an electrode connector (3.1) is led out. The reflection plate is composed of a reflection plate (5) with a 10 mm thick heat-insulating reflection layer (6) at the bottom of the reflection plate. Then, the upper cover body (1) and the lower body (7) of the shell are stamped out of a 0.5 mm metal sheet to form a whole package, and a far-infrared radiation heating plate with an outer diameter of 132 mm, a thickness of 18 mm, 220 V / AC, and 800 W is made. See Figure 6 .

[0020] The far-infrared radiation heating plate manufactured according to the technical method of the present invention has a resistance value (power) error of less than ±2% between the same models, can be heated to 600°C in 5 seconds after power-on, the heating power can be conveniently controlled by a thyristor voltage regulating circuit, the normal operating temperature of the radiation surface can be arbitrarily adjusted between 50°C and 800°C, the heating temperature of the radiation surface is uniform, the infrared conversion rate can reach 95%, and the temperature of the bottom (back) of the far-infrared radiation heating plate is controlled below 80°C during operation. The thin-plate far-infrared radiation heating plate has a compact structure, is safe and reliable, and is easy to install, and can be applied to flat-plate far-infrared electric frying pans, far-infrared radiation heating plates for household electric ovens, and far-infrared radiation heating plates for all-glass electric kettles.

[0021] The above-mentioned embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person skilled in the art, several modifications, improvements and substitutions can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A flat thin plate type far-infrared radiation heating panel, comprising a heating core disc, a transmissive glass panel, a reflective glass panel, a heat-insulating reflective layer and a shell, characterized in that: The filament carbon fiber is woven into a flat heating core disk according to different numbers of warp and weft strands, and is clamped on both sides by microcrystalline glass or quartz glass. The upper side is a radiation side with a transmission glass panel, and the lower side is a reflection glass panel. The glass powder is melted and hot-pressed at high temperature to seal the heating core disk and lead out the electrode wire connector. A heat-insulating reflection layer is arranged under the reflection glass panel. The heat-insulating reflection layer is pressed from nano-porous material, and the outer shell formed by stamping of metal sheet is used as the heating plate mounting bracket.

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