Graphene electric heating film heating cooking device

Abstract

The present invention relates to a graphene electric heating film heating cooking device. The cooking device comprises a container and a graphene electric heating film, wherein the graphene electric heating film is placed on the bottom surface of the container, and the graphene electric heating film comprises a graphene heating layer, an electrode and an insulating protective layer, wherein the graphene heating layer is a single-layer graphene, a few-layer graphene or a multi-layer graphene. The cooking device of the present invention generates heat through the graphene electric heating film, so that the food is heated evenly to avoid the situation that the food is burnt or not cooked thoroughly; food can be cooked at low temperature and low power to achieve energy saving and emission reduction; the temperature rises quickly and the temperature can be accurately controlled; almost no smoke is generated during the cooking process, which is very suitable for cooking indoors.

Description

Technical Field

[0001] The invention relates to the field of cooking utensils, and in particular to a graphene electric heating film heating cooking device. Background Art

[0002] Existing electric furnaces usually use alloy wires or alloy foils as heating elements for heating. The most common method is to make the alloy wires into electric heating tubes for heating. This type of electric furnace has many disadvantages.

[0003] First, the alloy heating element heats unevenly. The heating element dissipates heat in the form of a point heat source or a line heat source. The temperature is high near the heating element, while the temperature is low far from the heating element. During the baking process, the food is easily heated unevenly, resulting in some areas of the same food being undercooked while other areas being burnt. Although some baking trays currently use multiple heating elements to heat simultaneously in parallel or heat the heating elements in a way that makes them heat, on the one hand, such a structure has limited improvement on the uneven heating, especially the temperature between the heating elements is usually much lower than the corresponding position of the heating element; on the other hand, such a complex structure causes inconvenience in early installation and later maintenance.

[0004] Secondly, the processing temperature is relatively high when the alloy heating element is used for heating. At present, the temperature sensor is usually installed on the baking tray to detect the temperature of the baking tray. However, since the sensor does not generate heat and the temperature of the baking tray is uneven when the alloy element is heated, the temperature detected by the temperature sensor is usually much lower than the temperature near the heating element. In other words, the baking tray temperature is usually higher than the set temperature, so the cooking temperature often exceeds 200°C, which is higher than the smoke point of most edible oils. Therefore, a large amount of oil smoke will appear during the baking process.

[0005] Thirdly, the electric barbecue grills using alloy heating elements have a large power, usually greater than 1000W, so energy waste is serious. Summary of the invention

[0006] The technical problem to be solved by the present invention is that the current electric ovens have uneven heating, high heating temperature, large power and are difficult to accurately control the temperature.

[0007] In order to solve the above technical problems, the inventors adopt graphene electric heating film as a heating element, which dissipates heat with a planar heat source, and prepare an electric oven with uniform heating, energy saving and high temperature control accuracy.

[0008] Specifically, the present invention proposes the following technical solutions:

[0009] The present invention provides a cooking device, which includes a container and a graphene electric heating film, wherein the graphene electric heating film is placed on the bottom surface of the container, and the graphene electric heating film includes a graphene heating layer, an electrode and an insulating protective layer, wherein the graphene heating layer is a single-layer graphene, a few-layer graphene or a multi-layer graphene, and preferably, the insulating protective layer is arranged on the upper and lower surfaces of the graphene heating layer.

[0010] Preferably, in the above cooking device, the area of ​​the graphene is substantially equal to the area of ​​the graphene electric heating film;

[0011] Preferably, the area of ​​the graphene is 50% to 100% of the bottom area of ​​the container; more preferably, the area of ​​the graphene is more than 60% of the back area of ​​the container; more preferably, the area of ​​the graphene is more than 70% of the back area of ​​the container; more preferably, the area of ​​the graphene is more than 80% of the back area of ​​the container; more preferably, the area of ​​the graphene is more than 90% of the back area of ​​the container.

[0012] Preferably, in the above-mentioned cooking device, the graphene heating layer is 1 to 10 layers of graphene, preferably, the graphene heating layer is 1 to 5 layers of graphene, and more preferably, the graphene heating layer is 1 to 2 layers of graphene.

[0013] Preferably, in the above-mentioned cooking device, the electrode material is arranged on the surface of the graphene heating layer, preferably, the electrode material is arranged on both sides of the graphene heating layer, more preferably, the electrode material is selected from metal, preferably, the electrode material is selected from silver, copper and / or aluminum.

[0014] Preferably, the above cooking device, wherein the cooking device comprises a temperature sensor, preferably, the temperature sensor is connected to the graphene electric heating film, more preferably, the temperature sensor is arranged on the bottom surface of the graphene electric heating film;

[0015] More preferably, the cooking device includes an over-temperature protection switch; more preferably, the over-temperature protection switch is connected to the graphene heating film; more preferably, the over-temperature protection switch is set to a temperature of 145 to 180°C; more preferably, the over-temperature protection switch is set to a temperature of 145 to 150°C.

[0016] Preferably, the above-mentioned cooking device is provided with a bottom shell, and the bottom shell is located below the graphene electric heating film. Preferably, the bottom shell is installed on the bottom surface of the container.

[0017] Preferably, the above cooking device comprises a supporting member,

[0018] Preferably, the support component is provided with a temperature control system; more preferably, one end of the temperature sensor is connected to the bottom surface of the graphene electric heating film, and the other end is connected to the temperature control system;

[0019] More preferably, the supporting component is provided with a first conductive contact portion, the container is provided with a second conductive contact portion, the second conductive contact portion is electrically connected to the graphene heating film, and when the container is placed on the supporting component, the first conductive contact portion is electrically connected to the second conductive contact portion.

[0020] Preferably, in the above-mentioned cooking device, the container is provided with an oil leakage port, and preferably, the oil leakage port is located at an edge of the container.

[0021] Preferably, the above cooking device comprises an oil receiving component, and preferably, the oil receiving component is detachably placed on the bracket at a position corresponding to the oil leakage port.

[0022] Preferably, in the above-mentioned cooking device, the holding utensil is selected from a baking tray, a grill or a pot. Preferably, the holding utensil is selected from a metal material or a glass material. More preferably, a non-stick coating is sprayed on the surface of the holding utensil. More preferably, the non-stick coating is selected from a polytetrafluoroethylene coating.

[0023] The beneficial effects of the present invention include:

[0024] 1. Graphene heating film is a planar heating structure that generates heat as a whole. Using it as a heating element in cooking can heat the food evenly and avoid the situation where the food is burnt or undercooked.

[0025] 2. As a heating element, graphene electric heating film can cook food at low temperature and low power, achieving energy saving and emission reduction.

[0026] 3. The graphene electric heating film is used as a heating element, which heats up quickly and reacts sensitively to changes in voltage or current. The power control is performed by infinitely adjusting the voltage or current through the temperature control system to achieve precise temperature control.

[0027] 4. The graphene heating electric barbecue grill produces almost no smoke during the cooking process, which is very suitable for indoor cooking. Cooking tasks such as barbecue that need to be done outdoors can be transferred indoors. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The electric barbecue grill of embodiment 1;

[0029] Figure 2 The electric barbecue grill of embodiment 2;

[0030] In the figure, 1 is a baking tray, 2 is a graphene electric heating film, 3 is a bottom shell, 4 is a temperature sensor, 5 is a bracket, 6 is a temperature control system, 7 is a metal contact column, 8 is a metal contact point, 9 is an oil leak port, and 10 is an oil receiving tray. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, based on the specific implementations of the present invention, all other implementations obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Unless otherwise specified, the terms "center", "top", "bottom", "up", "down", "left", "right", "vertical", "horizontal", "longitudinal", "lateral", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] The terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as relative importance.

[0036] As used herein, the term "bottom side" refers to the side facing away from the food product.

[0037] The term "graphene" or "single-layer graphene" refers to a single layer of carbon atoms arranged in sp 2 The hybrid orbitals form a two-dimensional carbon nanomaterial with a hexagonal honeycomb lattice, including doped or undoped graphene.

[0038] The term "few-layer graphene" refers to a material obtained by stacking 2 to 3 layers of "single-layer graphene".

[0039] The term "multilayer graphene" refers to a material obtained by stacking 4 to 10 layers of "single-layer graphene".

[0040] In the preferred technical solution of the present invention, the graphene electric heating film heating electric oven includes a container and a graphene electric heating film. The graphene electric heating film is placed on the bottom surface of the container. The graphene electric heating film generates heat through graphene. The area of ​​the graphene is basically equal to the area of ​​the graphene electric heating film, which can reach more than 50% of the bottom surface area of ​​the container.

[0041] The graphene electric heating film can be prepared by the method of Example 1 or Example 2 of CN105517215B. The electric heating film comprises an insulating layer, a graphene heating layer, an electrode layer, and an insulating protective layer.

[0042] In the preferred technical solution of the present invention, the graphene electric heating film heating electric oven includes a baking tray, a graphene electric heating film, a power supply and a temperature control system.

[0043] In the preferred technical solution of the present invention, the graphene electric heating film is directly attached to the bottom surface of the baking pan. Preferably, the baking pan material can be selected from metal material or glass material, preferably metal material. The front of the baking pan made of metal material can be sprayed with a coating with polytetrafluoroethylene as the main raw material. During stable operation, the temperature difference between the temperature of the graphene electric heating film and the temperature of the front of the metal baking pan is less than 5%.

[0044] In the preferred technical solution of the present invention, an over-temperature protection switch and a temperature detector are provided on the graphene electric heating film. The temperature detector measures the temperature of the graphene electric heating film in real time, and the over-temperature protection switch controls the maximum temperature of the electric oven in real time. Preferably, the over-temperature protection switch is set at a temperature of 150 to 180°C; more preferably, the over-temperature protection switch is set at a temperature of 150°C to prevent the cooking temperature of the graphene electric barbecue oven from exceeding 150°C. Thus, the cooking temperature considered by the graphene point is controlled within the smoke point of most edible oils.

[0045] In the preferred technical solution of the present invention, the graphene heating electric oven includes a baking tray, a graphene electric heating film, a bottom shell, a power supply and temperature control system, an oil leakage receiving tray and a bracket.

[0046] In the preferred technical solution of the present invention, the bottom shell can effectively block the heat radiation generated by the downward side of the graphene electric heating film and the heat loss caused by air convection in the environment, so that the heat energy generated by the graphene electric heating film is transferred to the baking tray as much as possible. The bottom shell can effectively optimize the use of heat energy and effectively improve the efficiency of electricity utilization, thereby achieving energy-saving effects.

[0047] In the preferred technical solution of the present invention, the power supply includes a power switch and an indicator light. Since the graphene electric heating film can be applied to direct current or alternating current, and the voltage within the rated voltage can make the graphene electric heating film generate heat, the temperature control system should adopt a voltage or current variable frequency regulation method.

[0048] As a supporting structure of the graphene electric heating film electric barbecue grill, the bracket can suspend the graphene electric barbecue grill to avoid direct contact between the heating part of the graphene electric barbecue grill and the desktop, thereby minimizing the impact of the graphene electric barbecue grill on the desktop. Preferably, the part of the bracket in contact with the graphene electric barbecue grill should be made of high temperature resistant, insulating, and low thermal conductivity materials.

[0049] Example 1

[0050] This embodiment is an electric barbecue oven. Figure 1 As shown, the electric barbecue grill includes a grill plate 1, a graphene electric heating film 2, a bottom shell 3, a power supply, a temperature control system 6 and a bracket 5. The graphene electric heating film 2 includes two layers of graphene and electrodes, and the surface of the graphene electric heating film is a polyethylene naphthalate (PEN) insulating protective layer. The temperature of the graphene electric heating film can rise to 150°C in about 30 seconds. The graphene electric heating film 2 is connected to a temperature sensor 4 and an over-temperature protection switch, and the over-temperature protection switch sets the protection temperature of the graphene electric heating film 2 to 150°C.

[0051] The graphene electric heating film 2 is directly attached to the bottom surface of the baking tray 1, and the area of ​​the graphene electric heating film 2 is 60% of the bottom surface area of ​​the baking tray 1. The bracket 5 is provided with two metal contact pillars 7, which are connected to the power switch. The baking tray is provided with two other metal contact points 8, which are connected to the graphene electric heating film 2, the temperature sensor 4, and the over-temperature protection switch. The metal contact points 8 correspond to the metal contact pillars 7 on the bracket. When the baking tray is placed on the bracket, the metal contact points can correspond to the metal pillars, thereby connecting the entire electrical circuit.

[0052] After testing, the maximum temperature difference between the baking tray 1 and the graphene electric heating film 2 is 5°C, the area of ​​the effective heating zone of the baking tray 1 is basically equal to the area of ​​the graphene electric heating film 2, and the adjacent 25cm 2 The temperature difference between the highest and lowest temperatures in the area is about 12°C. This shows that the electric barbecue grill made of graphene electric heating film has a very uniform cooking temperature. During the cooking process, the ingredients are evenly baked and almost never burn. In addition, according to testing, the effective heating area is about 1000cm 2 The electric barbecue grill uses about 250W of power, which achieves the purpose of energy saving to a large extent.

[0053] By adjusting the temperature of the graphene electric heating film through the temperature control system, it is found that the temperature control accuracy of the baking tray can reach 5°C when the response time is 10s. The baking tray temperature of the electric oven made of graphene electric heating film can be effectively controlled within the smoke point, and the wide voltage range of the graphene electric heating film can be used to effectively control the cooking temperature.

[0054] Place steaks weighing about 250g each on a baking tray and grill them. The electric oven can grill the steaks to perfection in 9 minutes without any smoke, thus achieving smokeless grilling of the ingredients. While ensuring smokeless grilling, the ingredients can also be baked to perfection.

[0055] Example 2

[0056] The electric barbecue oven in this embodiment is different from the electric barbecue oven in embodiment 1 in that:

[0057] The graphene electric heating film 2 includes a layer of graphene and an electrode. The surface of the graphene electric heating film is a polyethylene naphthalate (PEN) insulating protective layer. The temperature of the graphene electric heating film can be raised to 150° C. in about 15 seconds.

[0058] The area of ​​the graphene electric heating film 2 is 70% of the bottom area of ​​the baking tray 1 .

[0059] Example 3

[0060] The electric barbecue grill in this embodiment is different from the electric barbecue grill in Embodiment 1 in that the graphene electric heating film 2 includes three layers of graphene and electrodes, the surface of the graphene electric heating film is a polyimide (PI) insulating protective layer, and the temperature of the graphene electric heating film can be raised to 180°C in about 50 seconds.

[0061] The area of ​​the graphene electric heating film 2 is 90% of the bottom area of ​​the baking tray 1 .

[0062] Example 4

[0063] This embodiment is an electric barbecue oven. Figure 2 As shown, the electric oven of this embodiment is different from the electric oven of embodiment 1 in that an oil leakage port 9 is provided on the right side of the baking pan, and an oil receiving pan 10 is provided on the bracket.

[0064] Comparative Example 1

[0065] The graphene electric heating film in Example 1 was replaced by alloy foil. After testing, the effective heating area of ​​the baking tray was 2 The temperature difference between the highest and lowest temperatures in the area is about 30°C. Therefore, the uniformity of the baking pan surface of the electric barbecue grill made of graphene electric heating film is much better than that of the baking pan made of alloy foil and other methods.

[0066] In addition, it has been tested that the error between the controlled temperature and the set temperature of the electric baking tray made of alloy foil reaches 68°C in 10 seconds. Therefore, the temperature control accuracy of the electric barbecue grill made of graphene heating film is much higher than that of the electric barbecue grill made of aluminum alloy foil.

[0067] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A cooking device, characterized in that: The cooking device comprises a container (1) and a graphene electric heating film (2), wherein the graphene electric heating film (2) is placed on the bottom surface of the container (1), the graphene electric heating film (2) comprises a graphene heating layer, an electrode and an insulating protective layer, the graphene heating layer is three layers of graphene, the insulating protective layer is arranged on the upper and lower surfaces of the graphene heating layer, and the graphene electric heating film (2) rises to 180° C. in 50 seconds; The cooking device comprises an over-temperature protection switch, the over-temperature protection switch is connected to the graphene electric heating film (2), and the over-temperature protection switch is set at a temperature of 145 to 180° C.; The cooking device comprises a supporting component (5), the supporting component (5) is provided with a first conductive contact portion (7), the container (1) is provided with a second conductive contact portion (8), the second conductive contact portion (8) is electrically connected to the graphene electric heating film (2), and when the container (1) is placed on the supporting component (5), the first conductive contact portion (7) and the second conductive contact portion (8) are electrically connected.

2. The cooking device according to claim 1, characterized in that: The area of ​​the graphene electric heating film (2) is 50% to 100% of the bottom area of ​​the container (1).

3. The cooking device according to claim 2, characterized in that: The electrode is arranged on the surface of the graphene heating layer.

4. The cooking device according to claim 2, characterized in that: The electrodes are arranged on both sides of the graphene heating layer.

5. The cooking device according to claim 2, characterized in that: The material of the electrode is selected from silver, copper and / or aluminum.

6. The cooking device according to claim 1, characterized in that: The cooking device comprises a temperature sensor (4), the temperature sensor (4) is connected to the graphene electric heating film (2), and the temperature sensor (4) is arranged on the bottom surface of the graphene electric heating film (2).

7. The cooking device according to claim 1, characterized in that: The cooking device is provided with a bottom shell (3), the bottom shell (3) is located below the graphene electric heating film (2), and the bottom shell (3) is installed on the bottom surface of the container (1).

8. The cooking device according to claim 6, characterized in that: The support component (5) is provided with a temperature control system (6); one end of the temperature sensor (4) is connected to the bottom surface of the graphene electric heating film (2), and the other end is connected to the temperature control system (6).

9. The cooking device according to claim 1, characterized in that: The container (1) is provided with an oil leakage port (9), and the oil leakage port (9) is located at the edge of the container (1).

10. The cooking device according to claim 9, characterized in that: The cooking device comprises an oil receiving component (10), and the oil receiving component (10) is detachably placed at a position on the supporting component (5) corresponding to the oil leakage port (9).

11. The cooking device according to claim 1, characterized in that: The container (1) is a baking tray, the container (1) is made of metal or glass, and a non-stick coating is sprayed on the surface of the container (1), the non-stick coating is selected from a polytetrafluoroethylene coating.

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