Plate-type heating element and heating device

Abstract

The utility model discloses a plate-type heating element and a heating device, and relates to the technical field of cooking utensils, the plate-type heating element is used for the cooking utensils, the plate-type heating element comprises a substrate and a heating metal wire, the substrate is made of insulation and heat conduction materials, and the substrate is provided with two sides located in the thickness direction of the substrate; the heating metal wires are wound on the substrate and distributed to the two sides of the substrate. The heating metal wires can uniformly cover the substrate, when current passes through the heating metal wires, generated heat can be quickly and uniformly transmitted to the substrate, local overheating or cold areas are avoided, the substrate and the heating metal wires are matched with a large heating surface, and therefore when the large-area heating requirement exists, the heating effect is good, and the heating effect is good. The problem of uneven temperature distribution can be solved.

Description

Technical Field

[0001] This utility model relates to the field of cooking appliance technology, and in particular to a plate heating element and heating device. Background Technology

[0002] Existing cooking appliances typically only fulfill a single cooking function, exhibiting significant homogeneity. Furthermore, the preparation of some dishes requires transferring food between different appliances, which is cumbersome. To address this, a miniaturized, multi-functional all-in-one cooking appliance, such as a combination oven, is proposed that can be placed directly on the countertop for cooking and integrates different heating methods to meet diverse culinary needs. To facilitate easy placement and movement of this combination cooking appliance on the countertop, its overall size is generally designed to be small. Therefore, for combination cooking appliances with baking functions, the baking space is smaller compared to a conventional oven.

[0003] Conventional ovens typically use built-in stainless steel heating elements for internal heating. However, these stainless steel heating elements can lead to inconsistencies in the temperature field within the large cavity area. To improve this, manufacturers often try to optimize heat distribution by adjusting the design of the heating elements, such as bending them into spiral, U-shaped, S-shaped, or M-shaped forms. Additionally, multiple heating elements are sometimes combined to increase density and further improve temperature uniformity. While these measures alleviate the problem to some extent, they do not completely eliminate uneven temperature distribution. In compact, multi-functional cooking appliances with baking capabilities, the limited space exacerbates this uneven temperature distribution problem. Utility Model Content

[0004] The main purpose of this utility model is to propose a plate heating element and heating device, which aims to solve the problem of uneven temperature distribution in existing heating devices that require large-area heating.

[0005] To achieve the above objectives, the present invention proposes a plate heating element for use in cooking appliances, the plate heating element comprising:

[0006] A substrate made of an insulating and thermally conductive material, the substrate having two sides located in its thickness direction; and,

[0007] A heated metal wire is wound around the substrate and distributed on both sides of the substrate.

[0008] In one embodiment, the plate heating element further includes two protective plates made of insulating and thermally conductive material, which are disposed on opposite sides of the substrate and cover the heating wire.

[0009] In one embodiment, the substrate is made of mica sheet or thermally conductive ceramic; and / or,

[0010] The protective plate is made of mica sheet or thermally conductive ceramic.

[0011] In one embodiment, the protective plate is connected to the substrate via a connection structure.

[0012] In one embodiment, the connecting structure includes a side strip with a slot extending along its length, the edge of the protective plate being engaged with the edge of the substrate within the slot; and / or,

[0013] The protective plate and the substrate are provided with riveting holes, and the connection structure includes a riveting member, which passes through a plurality of the riveting holes to rivet the protective plate and the substrate.

[0014] In one embodiment, a plurality of winding grooves are provided on both sides of the substrate, and the plurality of winding grooves are for the heating metal wire to be wound and fixed.

[0015] In one embodiment, the thickness of the plate heating element is set to D, where 0.8 mm ≤ D ≤ 2 mm; and / or,

[0016] The thickness of the substrate is d1, 0.2mm≤d1≤0.6mm; and / or,

[0017] The diameter of the heating wire is d2, where 0.05mm ≤ d2 ≤ 0.15mm.

[0018] This utility model also provides a heating device, the heating device comprising:

[0019] The main body, the main body having a heating element; and,

[0020] A plate-type heating element is disposed on the main body and is used to heat the heating part;

[0021] The plate heating element includes:

[0022] A substrate made of an insulating and thermally conductive material, the substrate having two sides located in its thickness direction; and,

[0023] A heated metal wire is wound around the substrate and distributed on both sides of the substrate.

[0024] In one embodiment, the heating device includes a cutting board, a grill, a stovetop grill, an induction cooker, or an oven.

[0025] In one embodiment, a heating chamber is formed inside the main body, and the heating chamber forms the heating part;

[0026] The plate heating element is disposed against the cooking chamber.

[0027] In one embodiment, the heating assembly is disposed on the outer side of the cavity wall of the heating chamber; and / or,

[0028] The plate heating element is at least disposed on the top wall of the heating chamber.

[0029] In one embodiment, a heating zone is formed at the upper end of the main body;

[0030] The main body is further provided with a second heating component, which is used to heat the pot on the heating zone. The second heating component is at least partially opposite to the heating chamber.

[0031] In one embodiment, the second heating component includes an electromagnetic heating component; and / or,

[0032] The second heating component is located on the upper side of the heating chamber.

[0033] In one embodiment, the distance between the top surface of the heating chamber and the upper end surface of the main body is H1, where 20mm ≤ H1 ≤ 30mm; and / or,

[0034] The height of the main body is H, 70mm≤H≤150mm.

[0035] In the technical solution of this utility model, the plate heating element includes a substrate made of insulating and thermally conductive material and a heating wire. The substrate has two sides located in its thickness direction. The heating wire is wound around the substrate and arranged on both sides of the substrate. The heating wire can evenly cover the substrate. When current passes through the heating wire, the generated heat can be quickly and relatively evenly transferred to the substrate, avoiding local overheating or cold areas. By adapting the substrate and heating wire to a large heating surface, the problem of uneven temperature distribution can be solved when there is a need for large-area heating. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 A schematic diagram of a plate heating element according to an embodiment of the present invention;

[0038] Figure 2 for Figure 1 Exploded view of a plate-type heating element;

[0039] Figure 3 for Figure 2 Cross-sectional view of the middle plate heating element;

[0040] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0041] Figure 5 A schematic diagram of the structure of an embodiment of the heating device provided by this utility model;

[0042] Figure 6 for Figure 5 Cross-sectional view of the heating device.

[0043] Explanation of icon numbers:

[0044] 100. Plate heating element; 1. Base plate; 1a. Winding groove; 2. Heating wire; 3. Protective plate; 4. Connecting structure; 41. Edge strip; a. Riveting hole; 42. Riveting component;

[0045] 200. Heating device; 10. Main body; 101. Heating section; b. Heating chamber; 20. Second heating component.

[0046] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0048] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0049] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0050] This utility model proposes a plate heating element, which aims to solve the problem of uneven temperature distribution in existing heating devices that require large-area heating.

[0051] Please see Figures 1 to 4 In one embodiment of the present invention, the plate heating element 100 is used in a cooking appliance. The plate heating element 100 includes a substrate 1 made of an insulating and thermally conductive material and a heating wire 2. The substrate 1 has two sides located in its thickness direction. The heating wire 2 is wound around the substrate 1 and arranged on both sides of the substrate 1.

[0052] It should be noted that the cooking appliance is a combination cooking appliance integrating different heating methods, providing users with multiple cooking options. This cooking appliance is a small countertop appliance, and its usage scenario is similar to that of general small appliances such as electric ovens and microwave ovens. Therefore, to facilitate flexible arrangement and movement, the overall size of the cooking appliance is not excessively large. Compared to a conventional oven, its baking space is smaller, and ensuring even heat distribution is more challenging.

[0053] The plate heating element 100 is designed to provide a planar heating surface. In the prior art, S-shaped or M-shaped stainless steel heating tubes are bent into specific shapes to increase the heating area. However, regardless of the shape of the stainless steel heating tube, the heat is mainly concentrated around the heating tube, and unevenness is unavoidable in the process of heat transfer from the heating tube to the external object.

[0054] "Substrate 1 made of insulating and thermally conductive material" means that the substrate 1 is made of an insulating material with good thermal conductivity. This not only prevents current from being transferred through paths other than the heating wire 2, but also facilitates the effective conduction of heat from the heating wire 2 to the corresponding heating surface of the substrate 1. The substrate 1 can be made of materials such as alumina ceramic, aluminum nitride, or glass fiber reinforced plastic. Of course, other possible materials can also be used for the substrate 1, which can be determined according to the actual situation. This specification does not limit this aspect in the embodiments.

[0055] "The substrate 1 has two sides located in its thickness direction", that is, the substrate 1 has a certain thickness, and there are two opposing surfaces (i.e., the front and the back) in this thickness direction that can be used to arrange the heating wire 2.

[0056] "The heating wire 2 is wound around the substrate 1 and arranged on both sides of the substrate 1." The heating wire 2 crosses the two sides of the substrate 1 by winding, which can cover a larger surface area, thereby maximizing heating efficiency and uniformity.

[0057] Because the heating wire 2 is wound around the substrate 1, it ensures that the heating wire 2 covers the entire heating area as much as possible, so that when current passes through the heating wire 2, the heat generated can be transferred to the substrate 1 more evenly. Furthermore, the heating wire 2 used in the plate heating element 100 is directly attached to the substrate 1, forming a thinner heating element. Compared to the stainless steel heating tubes used in the prior art, the thickness and material properties of stainless steel tubes may result in less efficient and flat heat conduction compared to the heating wire 2 directly laid on the thin substrate 1.

[0058] In the technical solution of this utility model, the plate heating element 100 includes a substrate 1 made of insulating and thermally conductive material and a heating wire 2. The substrate 1 has two sides located in its thickness direction. The heating wire 2 is wound around the substrate 1 and arranged on both sides of the substrate 1. The heating wire 2 can uniformly cover the substrate 1. When current passes through the heating wire 2, the generated heat can be quickly and relatively evenly transferred to the substrate 1, avoiding local overheating or cold areas. The substrate 1 and the heating wire 2 are adapted to a large heating surface, thereby solving the problem of uneven temperature distribution when there is a large area heating requirement.

[0059] Further, please refer to Figure 2 In this embodiment, the plate heating element 100 further includes two protective plates 3 made of insulating and thermally conductive material. The two protective plates 3 are respectively disposed on both sides of the substrate 1 and cover the heating wire 2.

[0060] The protective plate 3 is located on both sides of the substrate 1 to ensure that the protective plate 3 will not cause current leakage, and at the same time protect the heating wire 2 from the influence of the external environment, such as physical damage, chemical corrosion or moisture intrusion.

[0061] Since the protective plate 3 is also made of thermally conductive material, the setting of the protective plate 3 ensures that heat is effectively dissipated, thus not affecting the heating performance.

[0062] Specifically, in some embodiments, the substrate 1 is made of mica sheet or thermally conductive ceramic.

[0063] It should be noted that mica is a natural mineral with good electrical insulation and high temperature resistance, as well as good flexibility and mechanical strength, and can remain stable in high temperature environments.

[0064] Using mica sheets as the substrate 1 material ensures electrical insulation performance while providing sufficient mechanical protection and allowing for uniform heat transfer.

[0065] It should also be noted that thermally conductive ceramics (such as alumina ceramics, aluminum nitride, etc.) also possess good thermal conductivity and electrical insulation properties. Furthermore, they are resistant to high temperatures and not easily affected by chemical substances.

[0066] Choosing thermally conductive ceramic as the substrate 1 material can improve thermal efficiency and ensure that the generated heat is quickly and evenly distributed across the entire heating surface.

[0067] In some embodiments, the protective plate 3 is made of mica sheet or thermally conductive ceramic.

[0068] When the protective plate 3 is made of mica sheet, it can effectively protect the internal heating wire 2 from the influence of the external environment. At the same time, due to its good thermal conductivity, it will not significantly hinder the outward transfer of heat.

[0069] Choosing thermally conductive ceramic as the material for the protective plate 3 allows heat to be transferred away from the heating wire 2 more quickly. Furthermore, the high strength and hardness provided by the thermally conductive ceramic enhance the structural stability of the entire heating element.

[0070] Furthermore, to prevent the protective plate 3 and the base plate 1 from misaligning and failing to achieve the protective purpose, please refer to [link to relevant documentation]. Figure 1 and Figure 2 In this embodiment, the protective plate 3 and the substrate 1 are connected by a connection structure 4.

[0071] The connection structure 4 can be a screwed structure, a riveted structure, or an adhesive layer, thereby achieving a fixed connection so that the plate heating element 100 can form a heating module.

[0072] Specifically, in some embodiments, the connecting structure 4 includes a side strip 41, which is provided with a slot extending along its length, and the protective plate 3 and the edge of the substrate 1 are engaged in the slot.

[0073] Mechanical fixation can be achieved by inserting the edges of the protective plate 3 and the base plate 1 into the slots of the edge strip 41. This configuration not only enables locking but also simplifies the assembly process, allowing for easy assembly and disassembly without the need for additional fastening tools or steps.

[0074] In other embodiments, the protective plate 3 and the substrate 1 are provided with riveting holes a, and the connecting structure 4 includes a riveting member 42, which passes through a plurality of the riveting holes a to rivet the protective plate 3 and the substrate 1.

[0075] The rivet hole a is a hole pre-drilled at the corresponding position on the protective plate 3 and the base plate 1.

[0076] The riveting component 42 generally includes fasteners such as rivets. After the rivets pass through the corresponding riveting holes a, they are pressed or deformed, thereby firmly connecting the protective plate 3 and the base plate 1 together.

[0077] The riveting connection provides a strong mechanical connection force, ensuring a tight fit between the protective plate 3 and the base plate 1, and preventing loosening or detachment.

[0078] In some other embodiments, the connecting structure 4 includes a side strip 41, which is provided with a slot extending along its length. The edges of the protective plate 3 and the substrate 1 are engaged in the slot. The protective plate 3 and the substrate 1 are provided with riveting holes a. The connecting structure 4 includes a riveting member 42, which passes through a plurality of the riveting holes a to rivet the protective plate 3 and the substrate 1.

[0079] The protective plate 3 and the base plate 1 are initially positioned and fixed by using the slots of the edge strip 41, and then the connection strength is further strengthened by using riveting parts 42 at key locations. This arrangement not only ensures quick and simple assembly, but also provides additional safety through riveting, ensuring that the protective plate 3 will not easily detach from the base plate 1 even under external force.

[0080] Further, please refer to Figure 2 In this embodiment, multiple winding grooves 1a are provided on both ends of the substrate 1, and the multiple winding grooves 1a are used for winding and fixing the heating metal wire 2.

[0081] The winding grooves 1a are located at both ends of the substrate 1, that is, the plurality of winding grooves 1a are distributed at intervals along the edge of the substrate 1.

[0082] When the heating wire 2 is arranged, it needs to pass through the multiple winding grooves 1a according to a certain path. Since the winding grooves 1a are pre-designed, they can guide the heating wire 2 to be arranged in a specific way. Combined with the limiting function of the winding grooves 1a, when the heating wire 2 is placed in the winding groove 1a, it can only be arranged along a predetermined direction and distance, thereby effectively limiting the wire's path and avoiding randomness. The spacing between each winding groove 1a can be precisely controlled, thereby ensuring that the distribution of the heating wire 2 on the entire substrate 1 is uniform.

[0083] It should be noted that the plate heating element 100 can be composed of a substrate 1 with the heating wire 2 wound around it and two protective plates 3. Of course, in order to increase the heating power, the substrate 1 with the heating wire 2 wound around it can be provided with multiple layers, and correspondingly, the protective plates 3 can be provided with more layers, so that the heating wire 2 on each layer of the substrate 1 can be covered. Then the thickness of the plate heating element 100 will also increase accordingly.

[0084] Specifically, in certain application scenarios, such as embedded installation, the thickness of the plate heating element 100 needs to be set to better adapt to different installation spaces. In this embodiment, the thickness of the plate heating element 100 is set to D, 0.8mm≤D≤2mm; and / or, the thickness of the substrate 1 is d1, 0.2mm≤d1≤0.6mm; and / or, the diameter of the heating wire 2 is d2, 0.05mm≤d2≤0.15mm.

[0085] The overall thickness D of the plate heating element 100 is set between 0.8 mm and 2 mm, which avoids heat loss due to being too thin and slow thermal response due to being too thick, thus ensuring effective heat conduction.

[0086] The overall thickness D of the plate heating element 100 is set between 0.8 mm and 2 mm, which provides the necessary structural rigidity to resist external pressure or deformation.

[0087] The thickness of the substrate 1 is set between 0.2 mm and 0.6 mm. This allows the substrate 1 to have good thermal conductivity for rapid heat transfer, while maintaining electrical insulation to prevent short circuits or other electrical faults.

[0088] Within this thickness range, the substrate 1 material is easy to process and can be cut, drilled, and other operations performed without affecting its physical properties.

[0089] It should also be noted that the diameter of the heating wire 2 directly affects its resistance value, and thus the heating power. Therefore, a suitable diameter needs to be set to achieve the desired heating effect.

[0090] Setting the diameter of the heating wire 2 between 0.05 mm and 0.15 mm not only ensures a good heating effect, but also makes the heating wire 2 easy to bend and wind, forming complex paths in a limited space and improving heating uniformity.

[0091] Preferably, the substrate 1 and the protective plate 3 are both made of mica sheets with a thickness of about 0.4 mm, the heating wire 2 has a diameter of φ0.1 mm, and the plate heating element 100 has a thickness of about 1.4 mm.

[0092] This utility model also proposes a heating device 200, please refer to [link / reference]. Figure 5 and Figure 6 The heating device 200 includes a main body 10 and a plate heating element 100. The main body 10 has a heating section 101. The plate heating element 100 is disposed on the main body 10 and is used to heat the heating section 101. The specific structure of the plate heating element 100 is as described in the above embodiments. Since the heating device 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0093] Specifically, the heating device 200 includes a cutting board, a grill, a stovetop grill, an induction cooker, or an oven.

[0094] The warming plate is used to maintain the temperature of dishes before serving or during service, ensuring that the food remains at a suitable eating temperature. Because warming plates typically require even and gentle heating to avoid overheating that could cause the food to dry out or spoil, the plate heating element 100 provides a flat and uniform heating surface suitable for this application.

[0095] The grill is used for grilling and frying various foods, such as meat and vegetables. Because the grill requires rapid heating and the ability to maintain a stable high temperature, while also ensuring uniform heating of the surface to guarantee even heating of the food, the plate heating element 100 can efficiently transfer heat to the entire heating surface, meeting the grilling requirements.

[0096] The aforementioned stovetop oven combines the functions of a traditional stove and an oven, and can be used for various cooking methods such as baking, roasting, and stewing. Because stovetop ovens have high requirements for their heating elements, they need not only powerful heating capacity but also excellent temperature control. The plate heating element 100 can achieve efficient heat distribution within a small space, making it suitable for integration into compact stovetop oven designs.

[0097] The induction cooker uses the principle of electromagnetic induction to directly heat the bottom of the cookware, making it suitable for various cooking operations. Although the induction cooker itself heats through electromagnetic induction, it may also be equipped with an auxiliary heating system (such as a preheating zone). The plate heating element 100 can be used as part of the heating system to provide additional heating support.

[0098] The oven is used for baking bread and cakes, and roasting meats and vegetables. Because the oven needs to maintain a stable temperature for extended periods and requires even heat distribution inside, the plate heating element 100 provides a reliable heat source, helping to achieve uniform heating, especially in situations requiring heating over a large area.

[0099] In one specific embodiment, please refer to Figure 6 The main body 10 has a heating chamber b inside, and the heating chamber b forms the heating part 101; the plate heating element 100 is disposed against the cooking chamber.

[0100] It is understood that the heating chamber b is provided inside the main body 10, and the heating chamber b is a space for the user to place food for cooking, such as the inner cavity of an oven.

[0101] The plate heating element 100 is positioned close to the cooking chamber. This arrangement ensures efficient heat transfer from the plate heating element 100 to the cooking chamber, reducing heat loss during transfer and allowing more heat to directly reach the food being heated. Furthermore, the flat heating surface of the plate heating element 100 conforms to the wall of the cooking chamber, ensuring a more even heat distribution and preventing localized overheating or underheating.

[0102] The plate heating element 100 is closely close to the cooking chamber. It can be understood that the plate heating element 100 can be disposed on the inner side of the cavity wall of the cooking chamber or on the outer side of the cavity wall of the cooking chamber. When the plate heating element 100 is disposed on the inner side of the cavity wall of the cooking chamber, the plate heating element 100 not only serves to heat the heating chamber b, but also enables direct heating of the food placed in the heating chamber b.

[0103] Specifically, in some embodiments, the heating assembly is disposed on the outer side of the cavity wall of the heating chamber b.

[0104] With this configuration, the inner wall of the heating chamber b forms a complete and smooth surface, and with the addition of a non-stick coating, there are no dead corners for cleaning, making it convenient to use.

[0105] In some embodiments, the plate heating element 100 is at least disposed on the top wall of the heating chamber b.

[0106] "At least set" means that one or more plate heating elements 100 can be set. When one plate heating element 100 is set, it can only be installed on the top wall of the heating chamber b. When multiple plate heating elements 100 are set, in addition to the plate heating element 100 being set on the top wall of the heating chamber b, the plate heating element 100 can be set on other parts such as the side wall and bottom wall of the heating chamber b.

[0107] Since the heating of food mainly relies on heat transfer from above when baking, the plate heating element 100 set on the top wall of the heating chamber b can better act on the exposed upper surface of the food to make better use of heat energy.

[0108] Furthermore, in some embodiments, a heating zone is formed at the upper end of the main body 10; a second heating component 20 is also provided inside the main body 10, the second heating component 20 is used to heat the pot on the heating zone, and the second heating component 20 is at least partially opposite to the heating chamber b.

[0109] The heating zone is formed at the upper end of the main body 10. The heating zone is located on top of the cooking appliance and is used to place pots or other cooking utensils for heating, corresponding to the panel on the main body 1. The shape of the working area is not limited, and the specific shape depends on the needs of the pot. If the pot is a flat-bottomed pan, the working area can be set as a flat plate to better accommodate the flat-bottomed pan. If the bottom of the pot is round, the working area can be set as a concave shape to better accommodate the round-bottomed pan.

[0110] The main body 10 also includes a second heating component 20 for heating a pot placed on the heating zone. The second heating component 20 may take a different form than the heating component in the heating chamber b to provide an alternative heating method.

[0111] It should be noted that the second heating component 20 can use an electromagnetic induction heating component. When the metal pot is placed in the heating zone, the electromagnetic field will generate eddy currents at the bottom of the pot, thereby directly heating the pot. This is suitable for efficient and rapid heating and is suitable for cooking methods such as boiling, stir-frying, and pan-frying.

[0112] The second heating component 20 can also use a resistance heating element, through which the heat generated by the resistance heating element is transferred to the cookware, suitable for slow cooking, heat preservation and other operations.

[0113] The second heating component 20 can also be an infrared heater, which directly heats the surface of the cookware or food through radiation, and is suitable for rapid heating and maintaining the surface temperature of food.

[0114] Thus, by integrating at least two different heating methods into the same cooking appliance, users can choose the most suitable heating mode according to their specific cooking needs, which greatly improves cooking efficiency, flexibility and convenience. Users no longer need to purchase other types of kitchen appliances, thus meeting diverse cooking needs.

[0115] Specifically, in some embodiments, the second heating component 20 includes an electromagnetic heating component. Thus, the cooking appliance integrates electromagnetic heating and baking functions, and the electromagnetic heating only affects metal cookware. The surface of the heating zone will not heat up when there is no cookware, reducing the risk of accidental burns to the upper part of the main body 10 and improving safety during use.

[0116] In some embodiments, the second heating component 20 is located on the upper side of the heating chamber b.

[0117] It is understood that the second heating component 20 is located above the heating chamber b, and will not directly affect the temperature distribution in the heating chamber b, thereby reducing the mutual interference between the two heating methods. Furthermore, the upper end of the main body 10 can be conveniently equipped with control keys, making it easy for users to control the second heating component 20.

[0118] In one embodiment, the distance between the top surface of the heating chamber b and the upper end surface of the main body 10 is H1, where 20mm ≤ H1 ≤ 30mm. When the second heating component 20 uses an electromagnetic heating device, the installation height of the electromagnetic heating device on the main body 10 can be set to 20mm to 30mm.

[0119] In one embodiment, the height of the main body 10 is H, where 70mm ≤ H ≤ 150mm. Therefore, when the plate heating element 100 is provided on the side wall of the heating chamber b, the installation height of the plate heating element 100 within the main body 10 is designed to adapt to the thickness of the food inside the heating chamber b. For example, when the food is a pancake, the installation height of the plate heating element 100 within the main body 10 can be 40mm to 50mm; when the food is a sweet potato, the installation height of the plate heating element 100 within the main body 10 can be 120mm to 130mm.

[0120] This design reduces the overall size, making the product more compact and lightweight, and easier for users to use and store in various environments. The lower height not only optimizes space utilization but is also particularly suitable for environments with limited space, such as kitchen countertops.

[0121] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A plate heating element for use in cooking appliances, characterized in that, The plate heating element includes: A substrate made of an insulating and thermally conductive material, the substrate having two sides located in its thickness direction; and, A heated metal wire is wound around the substrate and distributed on both sides of the substrate.

2. The plate heating element as described in claim 1, characterized in that, The plate heating element also includes two protective plates made of insulating and thermally conductive material. The two protective plates are respectively disposed on both sides of the substrate and cover the heating wire.

3. The plate heating element as described in claim 2, characterized in that, The substrate is made of mica sheet or thermally conductive ceramic; and / or, The protective plate is made of mica sheet or thermally conductive ceramic.

4. The plate heating element as described in claim 2, characterized in that, The protective plate is connected to the substrate via a connection structure.

5. The plate heating element as described in claim 4, characterized in that, The connecting structure includes a side strip, the side strip being provided with a slot extending along its length, the edge of the protective plate and the base plate being engaged within the slot; and / or, The protective plate and the substrate are provided with riveting holes, and the connection structure includes a riveting member, which passes through a plurality of the riveting holes to rivet the protective plate and the substrate.

6. The plate heating element as described in claim 1, characterized in that, Multiple winding grooves are provided on both ends of the substrate, and the multiple winding grooves are used for winding and fixing the heating metal wire.

7. The plate heating element as described in claim 1, characterized in that, The thickness of the plate heating element is set to D, 0.8mm ≤ D ≤ 2mm; and / or, The thickness of the substrate is d1, 0.2mm≤d1≤0.6mm; and / or, The diameter of the heating wire is d2, where 0.05mm ≤ d2 ≤ 0.15mm.

8. A heating device, characterized in that, include: The main body, the main body having a heating element; and, The plate heating element as described in any one of claims 1 to 7, wherein the plate heating element is disposed on the main body and is used to heat the heating part.

9. The heating device as described in claim 8, characterized in that, The heating device includes a food warmer, a grill, a stovetop, an induction cooker, or an oven.

10. The heating device as described in claim 8, characterized in that, The main body has a heating chamber inside, and the heating chamber forms the heating part; The plate heating element is disposed against the heating chamber.

11. The heating device as claimed in claim 10, characterized in that, The plate heating element is disposed on the outer side of the cavity wall of the heating chamber; and / or, The plate heating element is at least disposed on the top wall of the heating chamber.

12. The heating device as claimed in claim 10, characterized in that, A heating zone is formed at the upper end of the main body; The main body is further provided with a second heating component, which is used to heat the pot on the heating zone. The second heating component is at least partially opposite to the heating chamber.

13. The heating device as described in claim 12, characterized in that, The second heating component includes an electromagnetic heating component; and / or, The second heating component is located on the upper side of the heating chamber.

14. The heating device as claimed in claim 12, characterized in that, The distance between the top surface of the heating chamber and the upper end surface of the main body is H1, where 20mm ≤ H1 ≤ 30mm; and / or, The height of the main body is H, 70mm≤H≤150mm.

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