Electric hot tray and cooking utensil

Abstract

The invention discloses an electric hot tray and a cooking utensil, and relates to the field of electric heating. An electric heating disc comprises an electric heating film body, a metal cover plate and a buckle, and filling powder or a thermal expansion plate is arranged between the metal cover plate and the buckle. The filling powder can be placed at any position, and the thermal expansion plate is generally placed between the electrothermal film body and the buckle. The filling powder is graphite, magnesium oxide, aluminum oxide, vermiculite powder, sandy soil and other materials, and the thermal expansion plate is a material with the thermal expansion coefficient larger than that of a connecting material of the metal cover plate and the buckle. By using the filling powder, the powder can be moved through pressure and vibration to fill gaps in the electric heating plate, so that the electrothermal film main body is tightly attached to the metal cover plate, the electrothermal film main body can better dissipate heat, and the thermal power density of the electric heating plate is improved. The thermal expansion plate expands at high temperature, and the similar effect can also be achieved. The cooking utensil comprises any electric hot tray, the product is lower in height and smaller in size, and more cost is saved.

Description

Technical Field

[0001] The present invention relates to the field of electrothermal, especially to the field of household appliances. Background Art

[0002] Currently, an electrothermal disk is generally formed by welding or riveting an electrothermal tube on a metal disk, or by die-casting a metal disk with the electrothermal tube as the core. The electrothermal tube has a metal tube as the outer shell, and spiral electrothermal wires are evenly distributed along the central axis inside the tube. The gap is filled and compacted with magnesia sand having good insulation and heat conduction properties. Limited by factors such as the bending radius of the electrothermal tube, the electrothermal tube cannot completely cover the metal disk. Therefore, the heat is relatively concentrated, the temperature of the electrothermal tube and its covered area is relatively high, the temperature of the surrounding area is relatively low, the metal disk is heated unevenly, and the temperature of the wiring terminal of the electrothermal tube is relatively high. This leads to a series of problems such as unsatisfactory heating effect, low heat power density per unit area, the need to leave a large heat dissipation space for the wiring terminal, and thus the overall height of the cooking appliance is relatively high, the product volume increases, affecting the user experience, and wasting production material costs.

[0003] Application 202321343166.4 proposes an electrothermal disk, including an electrothermal film main body, a metal cover plate and a fastener. There is a filler metal between the electrothermal film main body and the metal cover plate. When welding the metal cover plate and the fastener, the electrothermal disk is heated by pressing, so that the filler metal melts and flows under capillary action to fill the gap between the electrothermal film main body and the metal cover plate, making the electrothermal film main body and the metal cover plate fit tightly. Thus, the electrothermal film main body can dissipate heat better, thereby improving the heat power density of the electrothermal disk and reducing the temperature of the wiring terminal at the same time. However, the flow of the filler metal after melting is difficult to control and is prone to cause short circuits. Summary of the Invention

[0004] In order to alleviate the deficiencies of the prior art, the present invention provides an electrothermal disk and a cooking appliance.

[0005] An electric hot plate, comprising an electrothermal film body, a metal cover plate and a fastener. There is filling powder or a thermal expansion plate between the metal cover plate and the fastener. The filling powder can be placed at any position. When placed between the metal cover plate and the electrothermal film body, it is preferably a heat-conducting powder. When placed between the electrothermal film body and the fastener, it is preferably a thermal expansion powder. When placed in direct contact with the heating wire of the electrothermal film, it is an insulating powder. The thermal expansion plate is generally placed between the electrothermal film body and the fastener. The filling powder is made of materials such as graphite, magnesium oxide, aluminum oxide, vermiculite powder, and sandy soil. The thermal expansion plate is a material with a thermal expansion coefficient greater than that of the connecting material between the metal cover plate and the fastener. The insulating film of the electrothermal film body is made of materials such as high-temperature-resistant fiberglass cloth and mica paper. The metal cover plate and the fastener can be made of metal materials such as stainless steel plates and aluminum plates. The metal cover plate can also be the bottom of a heating appliance such as a pot or kettle. The fastener can be made of heat-insulating materials such as ceramics. The electrothermal film body is installed between the metal cover plate and the fastener. The electrothermal film body can be perforated to facilitate the connection between the metal cover plate and the fastener. The fastener is fixed to the metal cover plate by means of welding, riveting or screws, etc., so that the electrothermal film body is as closely attached to the metal cover plate as possible. When the filling powder is in direct contact with the heating wire of the electrothermal film, it can replace the insulating film.

[0006] The beneficial effects of the present invention are: By using the filling powder, the powder can be moved through pressure and vibration to fill the gaps inside the electric hot plate, so that the electrothermal film body is closely attached to the metal cover plate, thereby enabling the electrothermal film body to dissipate heat better, improving the thermal power density of the electric hot plate, and at the same time reducing the temperature of the terminal. The thermal expansion plate expands at high temperatures and can also achieve a similar effect of filling the gaps inside the electric hot plate and making the electrothermal film body closely attached to the metal cover plate. The insulating film of the electrothermal film body can be made of materials such as high-temperature-resistant fiberglass cloth and mica paper, and the advantage is that it can withstand the high temperature during welding and increase the working temperature range of the electric hot plate. The metal cover plate can also be the bottom of a heating appliance such as a pot or kettle, and the advantage is that it can reduce the thermal resistance, improve the heating efficiency, reduce the weight, and lower the cost. The fastener can be made of heat-insulating materials such as ceramics, and the advantage is that it can insulate heat, reduce the temperature at the bottom of the heating plate, and can also increase the strength of the fastener. The electrothermal film body and the heat dissipation thin plate are perforated to facilitate the connection between the metal cover plate and the fastener, and the advantage is that it can reduce the span of the fastener and increase the fastening force. The fastener is fixed to the metal cover plate by means of welding, riveting or screws, etc., so that the electrothermal film body is as closely attached to the heat dissipation thin plate and the metal cover plate as possible, and the advantage is that the fixing method is flexible and diverse and can meet the requirements of different products. When the filling powder is in direct contact with the heating wire of the electrothermal film, it can replace the insulating film, and the advantage is that it can reduce the process and lower the cost.

[0007] The present invention provides a cooking appliance including the above-mentioned electric hot plate.

[0008] The beneficial effects of the present invention are: This cooking appliance has all the advantages of the above-mentioned electric hot plate, which will not be elaborated here. In addition, due to the good heat dissipation effect of the electric hot plate, the power density of the electric hot plate is higher and the temperature of the terminal is lower. Therefore, the overall height of this cooking appliance can be made lower, the product volume is smaller, and the production material cost can be saved, which can improve the user experience. Brief Description of the Drawings

[0009] Figure 1 , Figure 2 is a schematic structural diagram of the electric hot plate according to the present invention.

[0010] In the figure, 1. Electric heating film main body, 2. Metal cover plate, 3. Fastening tool, 4. Heat-conducting powder, 5. Insulating film, 6. Opening, 7. Terminal. Detailed Embodiment

[0011] The present invention will be further described below with reference to the drawings and embodiments.

[0012] Embodiment 1 In Figure 1 , 2, the embodiment of the present invention is an electric hot plate.

[0013] As Figure 1 , shown in 2: An electric hot plate includes an electric heating film main body 1, a metal cover plate 2 and a fastening tool 3. There is heat-conducting powder 4 between the electric heating film main body 1 and the metal cover plate 2. The electric heating film main body 1 is installed between the metal cover plate 2 and the fastening tool 3. There is an opening 6 on the electric heating film main body 1 to facilitate the connection between the metal cover plate 2 and the fastening tool 3. The heat-conducting powder 4 is magnesium oxide powder. The insulating film 5 of the electric heating film main body 1 is a heat-resistant mica paper material. The metal cover plate 2 is the bottom of the hot water kettle. When installing the fastening tool 3, the heat-conducting powder 4 moves under pressure to fill the gap between the electric heating film main body 1 and the metal cover plate 2, so that the electric heating film main body 1 and the metal cover plate 2 are closely attached. The electric heating film main body 1 has good heat dissipation, reducing the temperature of the terminal 7.

Claims

1. An electric heating plate, comprising an electrothermal film body, a metal cover plate and a buckle, wherein the electrothermal film body is installed between the metal cover plate and the buckle, Characterized in that: There is filled powder between the metal cover plate and the buckle.

2. An electric heating plate, comprising an electrothermal film body, a metal cover plate and a buckle, wherein the electrothermal film body is installed between the metal cover plate and the buckle, Characterized in that: There is a thermal expansion plate between the metal cover plate and the buckle.

3. The electric heating plate according to claim 1 or 2, Characterized in that: Holes are formed in the electrothermal film body to facilitate the connection between the metal cover plate and the buckle.

4. The electric heating plate according to claim 1 or 2, Characterized in that: The insulating film of the electrothermal film body is made of a high-temperature resistant material.

5. The electric heating plate according to claim 1 or 2, Characterized in that: The metal cover plate is the bottom of the heating appliance.

6. The electric heating plate according to claim 1 or 2, Characterized in that: The buckle is made of a heat-insulating material.

7. A cooking appliance, Characterized in that: It includes the electric heating plate according to any one of claims 1 to 6.

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