Heating tube and cooking apparatus

Abstract

A heating tube (100) comprises: a first light-transmitting tube (1); a carbon-based heating element (2), which is disposed inside the first light-transmitting tube and is suitable for emitting thermal radiation; and a reflecting member (3), which is disposed on the first light-transmitting tube and is external to the carbon-based heating element, wherein the first light-transmitting tube is provided with a light-transmitting region (11), and the reflecting member is configured to reflect infrared light at least towards the light-transmitting region.

Description

Heating elements and cooking equipment

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202411546362.0, filed on October 31, 2024, entitled “Heating Element and Cooking Apparatus”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of kitchen appliance technology, specifically a heating element and cooking device. Background Technology

[0004] A heating element is an electrical component that converts electrical energy into heat energy. In related technologies, some heating elements are constructed to generate heat radiation, which radiates energy in all directions when the heating element is working.

[0005] The above-mentioned technical solution results in the radiant energy generated by the heating element dissipating in all directions, leading to low energy utilization and significant energy loss. Summary of the Invention

[0006] Therefore, this application proposes a heating tube that improves the directional heating capability of the heating tube through a reflector, so that the heat radiation generated by the carbon heating element can be applied to the object to be heated, making full use of the heat radiation generated by the carbon heating element and reducing energy loss.

[0007] This application also proposes a cooking device that includes the aforementioned heating element.

[0008] A heating tube according to an embodiment of this application includes: a first light-transmitting tube; a carbon heating element disposed within the first light-transmitting tube and adapted to emit thermal radiation; and a reflector disposed within the first light-transmitting tube and located outside the carbon heating element. The first light-transmitting tube has a light-transmitting area, and the reflector is configured to reflect infrared light at least toward the light-transmitting area.

[0009] According to the heating tube of the embodiment of this application, the heat radiation generated by the carbon heating element is emitted through the light-transmitting area, which improves the directional heating capability of the heating tube. The heat radiation generated by the carbon heating element can be applied to the object to be heated, making full use of the heat radiation generated by the carbon heating element and reducing energy loss.

[0010] Optionally, the reflector is configured to reflect at least mid-infrared light.

[0011] Optionally, the reflector is configured to reflect infrared light with a wavelength of 2 to 9 μm.

[0012] Optionally, the reflective element is a reflective coating disposed on the first light-transmitting tube.

[0013] Optionally, the reflective coating includes: titanium dioxide, aluminum oxide, and barium sulfate.

[0014] Optionally, based on the total mass of the reflective coating, the titanium dioxide accounts for 25-40% of the mass, the aluminum oxide accounts for 5-20% of the mass, and the barium sulfate accounts for 20-30% of the mass.

[0015] Optionally, the thickness of the reflector is δ, where δ satisfies: 20μm≤δ≤140μm.

[0016] Optionally, δ further satisfies: 70μm≤δ≤100μm.

[0017] Optionally, the first light-transmitting tube is provided with a protective gas that encloses the carbon heating element.

[0018] Optionally, the carbon heating element has a sheet-like structure, and at least one side of the carbon heating element is disposed facing the light-transmitting area.

[0019] Optionally, the carbon heating element is constructed as a graphene heating element.

[0020] Optionally, in the longitudinal section of the first light-transmitting tube, the two ends of the reflector are point A and point B, respectively, the center of the reflector is point O, and the central angle ∠AOB of the reflector satisfies: 180°≤∠AOB≤300°.

[0021] Optionally, ∠AOB further satisfies: 250°≤∠AOB≤300°.

[0022] The cooking device according to an embodiment of this application includes: an inner pot, wherein the inner pot is provided with a cooking cavity; and a heating element as described in the above technical solution, wherein the heating element is adapted to output heat radiation toward the cooking cavity.

[0023] Optionally, in the longitudinal section of the first light-transmitting tube, the two ends of the reflector are point A and point B, respectively, and the connection between point A and point B is a first connecting line. The first connecting line has an angle with the horizontal plane so that the heating tube outputs heat radiation toward the middle of the inner liner.

[0024] Optionally, the angle α between the first connecting line and the horizontal plane satisfies: 10°≤α≤20°.

[0025] Optionally, multiple heating tubes are provided, with the multiple heating tubes spaced apart, and the light-transmitting area of ​​at least one heating tube is inclined toward the adjacent heating tube.

[0026] Optionally, the plurality of heating elements includes a first heating element and a second heating element, both of which are disposed at the top of the cooking zone. The light-transmitting area of ​​the first heating element faces downward and is inclined toward the second heating element, and the light-transmitting area of ​​the second heating element faces downward and is inclined toward the first heating element.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 is a cross-sectional view of a heating element according to an embodiment of this application;

[0030] Figure 2 is a cross-sectional view of the heating element according to an embodiment of this application;

[0031] Figure 3 shows the spectral radiation distribution of the graphene heating element;

[0032] Figure 4 is a distribution of infrared spectral reflectance of the reflective coating;

[0033] Figure 5 is a schematic diagram of a cooking apparatus according to an embodiment of this application;

[0034] Figure 6 is a schematic diagram of the fit between the heating element and the top wall of the inner liner according to an embodiment of this application;

[0035] Figure 7 shows the relationship between different coating thicknesses and coating angles and average irradiance.

[0036] Figure 8 shows the relationship between different angles α and the heating and temperature uniformity of the cooking cavity.

[0037] Reference numerals: 100, heating element; 1, first light-transmitting tube; 11, light-transmitting area; 2, carbon heating element; 3, reflector; 200, cooking equipment; 4, inner pot; 41, cooking cavity; 5, first heating element; 6, second heating element. Detailed Implementation

[0038] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0039] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] The heating element 100 according to an embodiment of this application is described below with reference to Figures 1-8.

[0042] Referring to Figures 1, 2 and 3, the heating tube 100 according to an embodiment of this application includes: a first light-transmitting tube 1, a carbon heating element 2 and a reflector 3. The carbon heating element 2 is disposed inside the first light-transmitting tube 1 and is adapted to emit thermal radiation. The reflector 3 is disposed in the first light-transmitting tube 1 and is located outside the carbon heating element 2. The first light-transmitting tube 1 has a light-transmitting area 11. The reflector 3 is configured to reflect infrared light at least toward the light-transmitting area 11.

[0043] It should be noted that the raw materials for the carbon heating element 2 may include natural graphite, artificial graphite, and / or graphene, and the first light-transmitting tube 1 may be made of glass, transparent plastic, or other transparent materials. Preferably, the first light-transmitting tube 1 is constructed as a glass tube, which has good light transmission and high temperature resistance, thus reducing the cost of the heating element 100.

[0044] When the heating element 100 is working, the carbon heating element 2 converts electrical energy into thermal radiation and disperses the thermal radiation toward the periphery of the carbon heating element 2. The thermal radiation generated by the carbon heating element 2 can be divided into two parts, one part of which propagates toward the light-transmitting area 11 and the other part of which propagates toward the reflector 3. The thermal radiation propagating toward the light-transmitting area 11 can be emitted directly, while the thermal radiation propagating toward the reflector 3 is reflected after contacting the reflector 3, and the reflected thermal radiation is emitted through the light-transmitting area 11.

[0045] It should be understood that some of the heat radiation is reflected by the reflector 3 and then directly emitted into the light-transmitting area 11, while some of the heat radiation is reflected by the reflector 3 and then emitted into other areas of the reflector 3. After multiple reflections by the reflector 3, the heat radiation emitted into the light-transmitting area 11 is emitted. In other words, the heat radiation generated by the carbon heating element 2 is ultimately emitted through the light-transmitting area 11. The user only needs to point the light-transmitting area 11 of the heating tube 100 toward the object to be heated so that the heat radiation generated by the carbon heating element 2 is applied to the object to be heated, making full use of the heat radiation generated by the carbon heating element 2 and reducing energy loss.

[0046] According to the heating tube 100 of the present application embodiment, the heat radiation generated by the carbon heating element 2 is emitted through the light-transmitting area 11, which improves the directional heating capability of the heating tube 100. The heat radiation generated by the carbon heating element 2 can be applied to the object to be heated, making full use of the heat radiation generated by the carbon heating element 2 and reducing energy loss.

[0047] In some embodiments, the reflector 3 is configured to reflect at least mid-infrared light.

[0048] Different materials have different reflective properties, and the reflective effect of different materials under different spectra mainly depends on the material's composition, structure, and the wavelength of the radiation. In order to improve the reflective ability of the reflector 3 to reflect the thermal radiation generated by the carbon heating element 2, it is necessary to analyze the thermal radiation generated by the carbon heating element 2. The carbon heating element can generate thermal radiation in the wavelength range of 1 to 20 μm.

[0049] In this embodiment, the reflector 3 is configured to reflect at least mid-infrared light, which refers to radiation with a wavelength range between 2.5 and 25 μm. In this embodiment, the wavelength range of the radiation reflected by the reflector 3 largely overlaps with the wavelength range of the thermal radiation generated by the carbon heating element 2. That is, the reflector 3 can reflect most of the thermal radiation generated by the carbon heating element, effectively improving the reflection effect of the reflector 3.

[0050] In some embodiments, the carbon heating element 2 is constructed as a graphene heating element. The graphene heating element has excellent properties such as fast heating, high heating temperature, and high strength, which effectively improves the heating effect of the heating tube 100.

[0051] In some further embodiments, the reflector 3 is configured to reflect infrared light with a wavelength of 2 to 9 μm.

[0052] Referring to Figure 3, it can be seen from the spectral radiation distribution of the graphene heating element that the main radiation band of the graphene heating element is in the range of 2 to 9 μm. Therefore, in this embodiment, the reflector 3 is configured to reflect infrared light with a wavelength of at least 2 to 9 μm, so that the thermal radiation generated by the graphene heating element can be reflected to the light-transmitting area 11, further improving the reflection effect of the reflector 3.

[0053] In this embodiment, the reflective capability of the reflector 3 is adapted to the thermal radiation generated by the graphene heating element, so that the reflector 3 is specifically used to reflect the thermal radiation generated by the graphene heating element, which effectively improves the utilization rate of the heat energy generated by the graphene heating element and reduces energy loss.

[0054] In other embodiments, the reflector 3 can not only reflect infrared light with wavelengths of 2 to 9 μm, but also reflect radiation of other wavelengths. However, the reflector 3 has a better reflective effect on infrared light with wavelengths of 2 to 9 μm compared to radiation of other wavelengths.

[0055] In some further embodiments, the reflector 3 is a reflective coating disposed on the first light-transmitting tube 1.

[0056] In this embodiment, the reflector 3 has a simple structure and is easy to install, which effectively reduces the cost of the heating tube 100.

[0057] It should be understood that the reflector 3 can also be a structure bonded to the first light-transmitting tube 1, and the reflector 3 can also be spaced apart from the first light-transmitting tube 1. For example, the reflector 3 can be fixed to an external fastener, as long as the reflector 3 can reflect the heat radiation of the carbon heating element 2 to the light-transmitting area 11. This application does not limit this.

[0058] In some specific embodiments, the reflective coating includes: titanium dioxide, aluminum oxide, and barium sulfate.

[0059] Titanium dioxide is a white pigment with excellent optical properties, particularly outstanding reflectivity in the infrared band. This high infrared reflectivity stems from its unique crystal structure and surface characteristics. The ionic arrangement and surface state within the titanium dioxide crystal structure enable it to effectively reflect infrared radiation and reduce heat absorption. Titanium dioxide has a small particle size and high transparency, exhibiting 80-90% reflectivity in the near-infrared region (0.780–2.5 μm). Barium sulfate, on the other hand, exhibits high reflectivity in both the visible and near-infrared regions.

[0060] By incorporating appropriate amounts of other elements or compounds into titanium dioxide, its optical properties can be adjusted. In the embodiments of this application, titanium dioxide and barium sulfate are mixed in the reflective coating, which effectively improves the reflectivity of the reflective coating to the 2-5 μm radiation band.

[0061] Alumina is a material with high reflectivity, especially in the infrared field. Its reflectivity is as high as 80% to 90% or more in the 5-12 μm radiation band. In this embodiment, the reflective coating includes titanium dioxide, alumina, and barium sulfate. The combination of titanium dioxide, alumina, and barium sulfate effectively improves the reflectivity of the reflective coating in the 2-9 μm radiation band. Referring to Figures 3 and 4, Figure 4 is a distribution diagram of the infrared spectral reflectivity of the reflective coating. The reflective coating in this embodiment has a reflectivity of over 90% in the 2-9 μm band, which matches the radiation spectrum of the graphene heating element, improving the reflective effect of the coating and further improving the heat utilization rate of the heating tube 100 while reducing energy loss.

[0062] In some further embodiments, the reflective coating comprises titanium dioxide, aluminum oxide, and barium sulfate. Based on the total mass of the reflective coating, titanium dioxide accounts for 25-40% of the mass, aluminum oxide accounts for 5-20% of the mass, and barium sulfate accounts for 20-30% of the mass.

[0063] If the mass percentage of titanium dioxide is less than 25%, it will affect the reflectivity of the reflective coating for the 2-5 μm radiation band. If the mass percentage of titanium dioxide is greater than 40%, it will affect the reflectivity of the reflective coating for the 5-9 μm radiation band.

[0064] If the mass percentage of barium sulfate is less than 20%, it will affect the reflectivity of the reflective coating for the 2-5 μm radiation band. If the mass percentage of barium sulfate is greater than 30%, it will affect the reflectivity of the reflective coating for the 5-9 μm radiation band.

[0065] If the mass percentage of alumina is less than 5%, it will affect the reflectivity of the reflective coating for the 5-9 μm radiation band. If the mass percentage of titanium dioxide is greater than 20%, it will affect the reflectivity of the reflective coating for the 2-5 μm radiation band.

[0066] In this embodiment, the mass percentages of titanium dioxide, aluminum oxide, and barium sulfate in the reflective coating are limited, so that the reflectivity of the reflective coating to the 2-9μm radiation band is limited to a certain range, which effectively improves the reflectivity of the reflective coating to the thermal radiation generated by the graphene heating element and improves the energy utilization rate.

[0067] In some specific embodiments, titanium dioxide accounts for 27% by mass, aluminum oxide accounts for 15% by mass, and barium sulfate accounts for 28% by mass.

[0068] Referring to Figure 3, the spectral radiation distribution of the graphene heating element shows that the radiation intensity in the 2-5 μm radiation band is relatively high, while the radiation intensity in the 5-9 μm radiation band is relatively low. In this embodiment, the mass percentage of titanium dioxide is 27%, the mass percentage of aluminum oxide is 15%, and the mass percentage of barium sulfate is 28%, which makes the reflective effect of the reflective coating more compatible with the thermal radiation generated by the graphene heating element, further improving the reflective effect of the reflective coating and increasing the energy utilization rate.

[0069] In other embodiments, the mass percentage of titanium dioxide can be any one of 25%, 28%, 30%, 33%, 38%, or 40%, or a range between any two. In other embodiments, the mass percentage of aluminum oxide can be any one of 5%, 8%, 10%, 13%, 18%, or 20%, or a range between any two. In other embodiments, the mass percentage of barium sulfate can be any one of 20%, 24%, 25%, 27%, 29%, or 30%, or a range between any two.

[0070] In some embodiments, the thickness of the reflector 3 is δ, where δ satisfies: 20μm≤δ≤140μm.

[0071] Referring to Figure 7, which is a table showing the relationship between different coating thicknesses and coverage angles and average irradiance, the data in the "Comparison" row of Figure 7 refers to the data measured in the example where the heating tube 100 does not have a reflector 3. As can be seen from the example with experiment number 6 in Figure 7, compared to the heating tube 100 without a reflector 3, the thermal radiation intensity of the heating tube 100 with a reflector 3 in this embodiment can be increased by more than 54%.

[0072] As shown in Figure 7, when the angle of the reflector 3 covering the first light-transmitting tube 1 is the same, the greater the thickness δ of the reflector 3, the greater the average irradiance emitted from the light-transmitting area 11. In other words, the thickness of the reflector 3 is positively correlated with its reflective effect. If the thickness δ of the reflector 3 is less than 20 μm, the reflective ability of the reflector 3 is poor, affecting the energy utilization rate of the heating tube 100. However, the thickness of the reflector 3 cannot be increased indefinitely, because the reflector 3 is a reflective coating. An excessively thick reflective coating will increase the stress between the reflective coating and the first light-transmitting tube 1, making the reflective coating prone to cracking.

[0073] In summary, the present application embodiment limits the thickness δ of the reflector 3 to 20μm≤δ≤140μm, which not only ensures the reflection effect of the reflector 3, but also reduces the risk of cracking of the reflector 3 and extends the service life of the heating tube 100.

[0074] In some further embodiments, δ further satisfies: 70μm≤δ≤100μm.

[0075] By further limiting the thickness δ of the reflector 3, the reflection effect of the reflector 3 is further improved, the risk of cracking of the reflector 3 is further reduced, and the service life of the heating tube 100 is extended.

[0076] In some specific embodiments, the thickness δ of the reflector 3 is any one of 70μm, 80μm, 90μm, and 100μm, or a range between any two.

[0077] Referring to Figure 2, in some embodiments, the longitudinal section of the first light-transmitting tube 1 has two ends, point A and point B, respectively, and the center of the reflector 3 is point O. The central angle ∠AOB of the reflector 3 satisfies: 180°≤∠AOB≤300°.

[0078] The portion of the first light-transmitting tube 1 without the reflector 3 forms the aforementioned light-transmitting area 11. The larger the central angle ∠AOB of the reflector 3, the smaller the light-transmitting area 11. Since the reflector 3 is used to reflect thermal radiation toward the light-transmitting area 11, the size of the central angle ∠AOB of the reflector 3 is an important influencing factor on the average irradiance.

[0079] If ∠AOB is less than 180°, the area occupied by the light-transmitting area 11 will be too large, affecting the directional heating function of the heating tube 100. If ∠AOB is greater than 300°, the area occupied by the light-transmitting area 11 will be too small, making it difficult to heat the object to be heated as a whole, resulting in uneven heating of the object.

[0080] In this embodiment, the central angle ∠AOB of the reflector 3 is limited to 180°≤∠AOB≤300°, which not only improves the average irradiance of the heating tube 100, but also improves the directional heating effect of the heating tube 100.

[0081] In some further embodiments, ∠AOB further satisfies: 250°≤∠AOB≤300°.

[0082] As shown in Figure 7, in examples where the thickness δ of the reflector 3 is the same, when 250°≤∠AOB≤300°, the average irradiance of the heating tube 100 is higher, which further improves the heating effect of the heating tube 100.

[0083] In some specific embodiments, the central angle ∠AOB of the reflector 3 is any one of 250°, 260°, 280°, 290°, or 300°, or a range between any two.

[0084] In some embodiments, the carbon heating element 2 has a sheet-like structure, and at least one side of the carbon heating element 2 is disposed facing the light-transmitting area 11.

[0085] Because when the carbon heating element 2 is working, the heat radiation is emitted from the surface of the carbon heating element 2. In this embodiment, the carbon heating element 2 has a sheet-like structure, so that most of the heat radiation generated by the carbon heating element 2 is emitted from the two sides of the carbon heating element 2, and the sides are set facing the light-transmitting area 11, so that more heat radiation can be emitted directly from the light-transmitting area 11 without being reflected by the reflector 3, which further reduces energy loss.

[0086] It should be understood that the carbon heating element 2 can also be in other shapes, and this application does not limit this.

[0087] In some further embodiments, a protective gas is provided inside the first light-transmitting tube 1 to enclose the carbon heating element 2.

[0088] Because the carbon heating element 2 is prone to oxidation in high-temperature environments, in order to extend the service life of the carbon heating element 2, in this embodiment of the application, a protective gas is added into the first light-transmitting tube 1 to prevent the carbon heating element 2 from contacting the air, thereby reducing the risk of oxidation of the carbon heating element 2 and extending its service life.

[0089] In some specific embodiments, the protective gas is argon. In other embodiments, the protective gas may also be helium or other inert gases. The protective gas may also be a mixture of multiple inert gases. This application does not limit this.

[0090] In some specific embodiments, ceramic heads are provided at both ends of the first light-transmitting tube 1 to seal the first light-transmitting tube 1. The carbon heating element 2 can be connected to an external power source through the electrical connector inside the ceramic head. After the first light-transmitting tube is evacuated, a small amount of protective gas is introduced into the first light-transmitting tube.

[0091] A specific embodiment of this application is described below with reference to Figures 1-8.

[0092] The heating tube 100 according to an embodiment of this application includes: a first light-transmitting tube 1, a carbon heating element 2, and a reflector 3. The carbon heating element 2 is disposed inside the first light-transmitting tube 1 and is adapted to emit thermal radiation. The reflector 3 is disposed in the first light-transmitting tube 1 and is located outside the carbon heating element 2. The first light-transmitting tube 1 has a light-transmitting area 11. The reflector 3 is configured to reflect infrared light at least toward the light-transmitting area 11.

[0093] The first light-transmitting tube 1 is constructed of glass.

[0094] The reflector 3 is configured to reflect at least mid-infrared light.

[0095] The carbon heating element 2 is constructed as a graphene heating element.

[0096] The reflector 3 is configured to reflect infrared light with a wavelength of 2 to 9 μm.

[0097] The reflective element 3 is a reflective coating provided on the first light-transmitting tube 1.

[0098] The reflective coating includes: titanium dioxide, aluminum oxide, and barium sulfate.

[0099] Titanium dioxide accounts for 27% of the mass, aluminum oxide accounts for 15% of the mass, and barium sulfate accounts for 28% of the mass.

[0100] The thickness δ of the reflector 3 is 100 μm.

[0101] The longitudinal section of the first light-transmitting tube 1 has two ends of the reflector 3, points A and B, respectively. The center of the reflector 3 is point O, and the central angle ∠AOB of the reflector 3 is 250°.

[0102] The carbon heating element 2 has a sheet-like structure, with at least one side of the carbon heating element facing the light-transmitting area 11.

[0103] The first light-transmitting tube 1 contains a protective gas, which is argon, to enclose the carbon heating element 2.

[0104] Referring to Figures 2, 5 and 6, the cooking device 200 according to an embodiment of this application includes: an inner pot 4 and a heating element 100. The heating element 100 is the heating element 100 in the above technical solution. The inner pot 4 is provided with a cooking cavity 41, and the heating element 100 is adapted to output heat radiation toward the cooking cavity 41.

[0105] According to the cooking device 200 of this application embodiment, the heat radiation generated by the carbon heating element 2 is emitted through the light-transmitting area 11, so that the heat radiation generated by the carbon heating element 2 can be applied to the food to be heated, making full use of the heat radiation generated by the carbon heating element 2, reducing energy loss, improving the heating speed of the cooking device 200, and improving the cooking effect of the cooking device 200.

[0106] In some embodiments, in the longitudinal section of the first light-transmitting tube 1, the two ends of the reflector 3 are point A and point B respectively, and the connecting line for connecting point A and point B is the first connecting line. The first connecting line has an angle with the horizontal plane so that the heating tube 100 outputs heat radiation toward the middle of the inner liner 4.

[0107] The portion of the first light-transmitting tube 1 without the reflector 3 forms a light-transmitting area 11. There is an angle between the first connecting line and the horizontal plane, that is, the light-transmitting area 11 is tilted relative to the horizontal plane, so that the heat radiation emitted by the heating tube 100 can be output towards the middle of the inner pot 4, so as to heat the food in the middle of the inner pot 4 and improve the cooking effect of the cooking device 200.

[0108] In some further embodiments, the angle α between the first connecting line and the horizontal plane satisfies: 10°≤α≤20°.

[0109] Referring to Figure 8, which is a table showing the relationship between different angles α and the heating and temperature uniformity of the cooking cavity, the data in the "Comparison" row of Figure 8 refers to the data measured in the example where the heating element 100 is not equipped with the reflector 3. As can be seen from Figure 8, in this embodiment of the application, by providing the reflector 3 on the heating element 100, the directional heating capability of the heating element 100 is improved, effectively increasing the heating rate within the cooking cavity 41.

[0110] Furthermore, as shown in Figure 8, the angle α between the first line and the horizontal plane will affect the heating rate of the cooking cavity 41 and the temperature difference within the cooking cavity 41.

[0111] If the included angle α is less than 10°, the heating tube 100 will emit less heat radiation towards the middle of the inner pot 4, resulting in a poor heating rate of the cooking cavity 41. If the included angle α is greater than 20°, the heating tube 100 will emit too much heat towards the middle of the inner pot 4, resulting in a large temperature difference at different locations within the cooking cavity 41, which will affect the uniformity of food heating.

[0112] In this embodiment, the angle α between the first connecting line and the horizontal plane is limited to 10°≤α≤20°, which not only limits the output direction of the radiation emitted by the heating tube 100 and improves the heating speed of the cooking cavity 41, but also avoids excessive temperature difference in the cooking cavity 41 and improves the uniformity of food heating.

[0113] In some specific embodiments, the angle α between the first connecting line and the horizontal plane is 17.7°. Compared with the example without a reflector, the heating tube 100 of this embodiment is provided with a reflector 3, and the angle α between the first connecting line of the reflector 3 and the horizontal plane is 17.7°, which not only ensures the uniformity of temperature in the cooking cavity 41, but also increases the heating rate of the cooking cavity 41 by more than 20%.

[0114] In some other specific embodiments, the angle α between the first connecting line and the horizontal plane is any one of 10°, 13°, 14°, 18°, 20° or a range between any two.

[0115] In some embodiments, a plurality of heating tubes 100 are provided, the plurality of heating tubes 100 are spaced apart, and the light-transmitting area 11 of at least one heating tube 100 is inclined toward the adjacent heating tube 100.

[0116] Through the above technical solution, the area irradiated by at least one heating element 100 can at least partially overlap with the area irradiated by the adjacent heating element 100, thereby increasing the heating speed of the overlapping area and improving the heating effect of the cooking device 200.

[0117] In some specific embodiments, the plurality of heating tubes 100 include a first heating tube 5 and a second heating tube 6. The first heating tube 5 and the second heating tube 6 are both disposed at the top of the cooking cavity 41. The light-transmitting area 11 of the first heating tube 5 faces downward and is inclined toward the second heating tube 6, and the light-transmitting area 11 of the second heating tube 6 faces downward and is inclined toward the first heating tube 5.

[0118] In the above technical solution, the arrangement of multiple heating tubes 100 inside the cooking device 200 is simple and easy to install, which reduces the cost of the cooking device 200. When the cooking device 200 is working, the first heating tube 5 and the second heating tube 6 can both output heat radiation toward the middle of the inner pot 4, which effectively improves the heating speed of the middle of the inner pot 4 and improves the heating effect of the cooking device 200.

[0119] It should be understood that the number of heating elements 100 in the cooking device 200 may be three, four or other numbers, and this application does not limit this number; the arrangement of the heating elements 100 in the cooking device 200 may also be in other ways, such as being distributed near the left and / or right side walls of the cooking cavity 41, or being distributed at the bottom of the cooking cavity 41, and this application does not limit this number.

[0120] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0121] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A heating element, wherein, include: First light-transmitting tube; A carbon heating element, wherein the carbon heating element is disposed inside the first light-transmitting tube and is adapted to emit thermal radiation; A reflector is disposed on the first light-transmitting tube and located outside the carbon heating element. The first light-transmitting tube has a light-transmitting area, and the reflector is configured to reflect infrared light at least toward the light-transmitting area.

2. The heating element according to claim 1, wherein, The reflector is configured to reflect at least mid-infrared light.

3. The heating element according to claim 1, wherein, The reflector is configured to reflect infrared light with a wavelength of 2 to 9 μm.

4. The heating element according to claim 2 or 3, wherein, The reflective element is a reflective coating disposed on the first light-transmitting tube.

5. The heating element according to claim 4, wherein, The reflective coating comprises: titanium dioxide, aluminum oxide, and barium sulfate.

6. The heating element according to claim 5, wherein, Based on the total mass of the reflective coating, the titanium dioxide accounts for 25-40% of the mass, the aluminum oxide accounts for 5-20% of the mass, and the barium sulfate accounts for 20-30% of the mass.

7. The heating element according to any one of claims 4-6, wherein, The thickness of the reflector is δ, which satisfies the following condition: 20μm≤δ≤140μm.

8. The heating element according to claim 7, wherein, δ further satisfies: 70μm≤δ≤100μm.

9. The heating element according to any one of claims 1-8, wherein, The first light-transmitting tube contains a protective gas that encloses the carbon heating element.

10. The heating element according to any one of claims 1-9, wherein, The carbon heating element has a sheet-like structure, and at least one side of the carbon heating element is disposed facing the light-transmitting area.

11. The heating element according to any one of claims 1-10, wherein, The carbon heating element is constructed as a graphene heating element.

12. The heating element according to any one of claims 1-11, wherein, In the longitudinal section of the first light-transmitting tube, the two ends of the reflector are point A and point B, respectively, the center of the reflector is point O, and the central angle ∠AOB of the reflector satisfies: 180°≤∠AOB≤300°.

13. The heating element according to claim 12, wherein, ∠AOB further satisfies: 250°≤∠AOB≤300°.

14. A cooking appliance, wherein, include: The inner pot is provided with a cooking cavity; The heating element according to any one of claims 1-13 is adapted to output heat radiation toward the cooking cavity.

15. The cooking apparatus according to claim 14, wherein, In the longitudinal section of the first light-transmitting tube, the two ends of the reflector are point A and point B, respectively. The connecting line for connecting point A and point B is the first connecting line. There is an angle between the first connecting line and the horizontal plane so that the heating tube outputs heat radiation toward the middle of the inner liner.

16. The cooking apparatus according to claim 15, wherein, The angle α between the first connecting line and the horizontal plane satisfies: 10°≤α≤20°.

17. The cooking apparatus according to any one of claims 14-16, wherein, The heating element is provided in multiple ways, and the multiple heating elements are arranged at intervals. The light-transmitting area of ​​at least one heating element is inclined toward the adjacent heating element.

18. The cooking apparatus according to claim 17, wherein, The plurality of heating elements include a first heating element and a second heating element. Both the first heating element and the second heating element are disposed at the top of the cooking cavity. The light-transmitting area of ​​the first heating element faces downward and is inclined toward the second heating element, and the light-transmitting area of ​​the second heating element faces downward and is inclined toward the first heating element.

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