Cooking utensils

Abstract

A cooking appliance (1000) comprising: a housing (100) in which a heating chamber (102) is defined; a heating plate (600) provided within the heating chamber (102) for placing food on; and heating tubes (300) provided within the heating chamber (102), with at least one provided above the heating plate (600) at a distance, and the heating core being a resistance sheet material (310).

Description

Technical Field

[0001] This application relates to the field of cooking appliances, particularly to cooking appliances.

Background Art

[0002] Currently, many cooking appliances for cooking ingredients such as pizza have multiple heating tubes distributed in the heating chamber and adopt a method of heating the ingredients over a wide range. Most of the heating tubes adopt metal tubes, and the heat on the surface of the metal tubes dissipates uniformly, resulting in a large waste.

[0003] Some cooking appliances use electromagnetic waves to heat ingredients, but it is necessary to provide a leakage prevention structure for electromagnetic waves on the housing of the cooking appliance, which results in high costs and high power consumption. Therefore, designing a cooking appliance with low design costs and high heat utilization rate is one of the current market demands.

Summary of the Invention

Problems to be Solved by the Invention

[0004] This application aims to solve at least to some extent one of the technical problems in the related art.

[0005] Therefore, this application provides a cooking appliance with high heat utilization rate and low cost.

Means for Solving the Problems

[0006] The cooking appliance according to an embodiment of this application includes a housing that defines a heating chamber inside, a heating plate provided in the heating chamber for placing ingredients, and at least one heating tube provided in the heating chamber at an interval above the heating plate, and the heating core is a resistive sheet material.

[0007] The cooking appliance of this invention employs a heating structure that combines a heating plate and a heating tube. By placing food on the heating plate, it is possible to heat the food directly, and the high temperature of the heating plate is directly transferred to the food, achieving the effect of searing the bottom of the food. By placing the heating tube above the food and searing the top of the food, the temperature inside the heating chamber is rapidly increased, allowing the food to be heated quickly in an appropriate temperature environment. By placing food on the heating plate, the position of the food is relatively fixed. The heating core of the heating tube is made of a resistance sheet material, and by utilizing its directional heating properties and arranging the resistance sheet material in the direction required by the food, it is advantageous to improve the heating efficiency of the food and the texture of the cooked food. Such a method is cost-controllable and has a high heat utilization rate.

[0008] Such combination methods not only improve the cooking speed of ingredients, but also help to achieve the effect of searing the top and bottom surfaces of ingredients at high temperatures by utilizing the high thermal conductivity and uniform heating of the heating tubes.

[0009] Additional aspects and advantages of this application are partially shown in the following description, partially become apparent from that description, or are understood through the implementation of this application. [Brief explanation of the drawing]

[0010] [Figure 1] This is a side view of a cooking utensil according to an embodiment of the present invention. [Figure 2] This is a schematic diagram of the internal structure layout of a cooking appliance in several examples. [Figure 3] This is a schematic diagram of the internal structure layout of a cooking appliance according to several other embodiments. [Figure 4] This is a schematic diagram of the internal structure layout of a cooking appliance in several other embodiments. [Figure 5] This is a schematic diagram of the internal structure layout of a cooking appliance in several further embodiments. [Figure 6] This is a schematic diagram of the internal structure layout of a cooking appliance in several examples. [Figure 7] This is a schematic diagram of the internal structure layout of a cooking appliance in several other embodiments. [Figure 8] This is a schematic diagram of the structure of a heating tube according to several embodiments. [Figure 9] This is a schematic diagram of the inner core structure of a heating tube according to several embodiments. [Figure 10] This is a schematic diagram of the inner core structure of a heating tube according to several other embodiments. [Figure 11] This is a schematic diagram of the inner core structure of a heating tube according to several other embodiments. [Figure 12] This is a schematic diagram of the inner core structure of a heating tube according to several further embodiments. [Figure 13] This is a schematic diagram of the structure of a heating plate according to several embodiments. [Figure 14] This is a schematic diagram of the structure of a cooking appliance according to several embodiments. [Modes for carrying out the invention]

[0011] The embodiments of the present application will be described in detail below. Examples relating to the above embodiments are shown in the drawings, and the same or similar reference numerals consistently indicate the same or similar elements or elements having the same or similar function. The embodiments described below with reference to the drawings are illustrative and used to illustrate the present application, and should not be construed as limiting the present application.

[0012] In the description of this application, directions or positional relationships indicated by terms such as "center," "lateral," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" are based on the directions or positional relationships shown in the drawings and are intended for ease of explanation and simplification of the description of this application. They do not indicate or imply that the device or element being referred to has a specific direction or must be configured and operate in a specific direction, and therefore cannot be understood as limitations of this application. Features that are limited as "first" or "second" may be explicitly or implicitly indicated to include one or more such features. In the description of this application, unless otherwise specified, "multiple" means two or more.

[0013] In the description of this application, unless otherwise specifically defined and limited, terms such as “attachment,” “connection,” and “connection” should be understood in a broad sense, for example, that they may be fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or internally connected to two elements. A person skilled in the art will be able to understand the specific meaning of the above technical terms in this application, depending on the specific circumstances.

[0014] Hereinafter, a cooking appliance 1000 according to an embodiment of the present application will be described with reference to the drawings, and the cooking appliance 1000 is used to heat food, and there are no limitations on the type of cooking appliance 1000. The cooking appliance 1000 may be an oven or other type of appliance.

[0015] The cooking appliance 1000 according to the embodiment of the present application comprises a housing 100, a heating plate 600, and a heating tube 300.

[0016] As shown in FIGS. 1 and 2, a heating chamber 102 is defined within the housing 100, and the housing 100 has an opening 101. The cooking appliance 1000 further includes a door body 200 for opening and closing the opening 101. The position of the door body 200 on the housing 100 is not restricted and can be on the side surface or the top surface, etc. Both the heating plate 600 and the heating tube 300 are provided within the heating chamber 102. The heating plate 600 is located at the center of the heating chamber 102 or closer to the lower part, and the heating plate 600 is used for placing food ingredients.

[0017] Here, when it is necessary to heat the food ingredients, the user can place the food ingredients on the heating plate 600 according to personal habits. Also, the user can separately prepare a tray or a shelf, place the food ingredients on the tray or the shelf, and then place the tray or the shelf with the food ingredients on the heating plate 600. Since the heating plate 600 can heat the food ingredients, a certain cooking appliance 1000 is a pizza oven. During use, the user usually directly places the food ingredients on the heating plate 600. In this way, the heat of the heating plate 600 is directly transmitted to the food ingredients, so the transmission path is short, the heat loss is small, the food ingredients can maintain a high heating temperature, which is advantageous for improving the utilization rate of heat. Here, there is no restriction on the heating core structure of the heating plate 600. It is possible to use a metal heating core 621 (such as a metal wire, a metal plate, etc.), an infrared heater, or a graphite heating core 622, etc., and it is not restricted here.

[0018] In the present application, at least one heating tube 300 is provided at an interval above the heating plate 600. The heat generated by the heating tube 300 can not only heat the air in the heating chamber 102, but also heat the food ingredients on the heating plate 600 to enable cooking of the food ingredients.

[0019] The heating core of the heating tube 300 is a resistance sheet material 310. Here, the resistance sheet material 310, as its name suggests, refers to a resistive material portion that can generate heat when electricity is passed through it, and this resistive material portion is in the form of a sheet. The larger the surface area of ​​the resistive material portion, the more heat is dissipated to the outside. For this reason, the sheet-shaped resistance sheet material 310 has directional heating properties, meaning that the resistance sheet material 310 generates more heat in the direction perpendicular to itself. Therefore, assuming the same distance, if the heating plate 600 is parallel to the resistance sheet material 310, it can absorb more heat.

[0020] The present invention involves placing food on a heating plate 600 and using a heating tube 300 to heat the food above the heating plate 600, thereby relatively fixing the position of the food. The heating core of the heating tube 300 is a resistance sheet material 310, and by utilizing its directional heating properties and arranging the resistance sheet material 310 in the direction required by the food, it is advantageous to improve the heating efficiency of the food and the texture of the cooked food.

[0021] In some embodiments, the resistance sheet material 310 is a metal sheet material, and therefore the resistance sheet material 310 has good electrical and thermal conductivity.

[0022] Metal sheet materials include iron sheets, copper sheets, chromium sheets, nickel sheets, tungsten sheets, and the like.

[0023] Of course, the resistive sheet material 310 of the present invention may employ any other resistive material known in the prior art, including carbon materials, ceramic materials, semiconductor materials, clay materials, and the like.

[0024] If the resistance sheet material 310 is a carbon sheet, it may also be a graphite sheet, activated carbon sheet, or carbon sheet. If the resistance sheet material 310 is a ceramic material sheet, the high-temperature resistance and corrosion resistance of the ceramic material can be obtained. If the resistance sheet material 310 is a semiconductor material sheet, it may include a silicon sheet, germanium sheet, etc. If the resistance sheet material 310 is a clay material sheet, it may include a charcoal clay sheet, corona ceramic sheet, corona clay sheet for ceramic cylinders, etc.

[0025] In some other embodiments, the resistive sheet material 310 is a thin film sheet, that is, the resistive sheet material 310 is a film sheet manufactured using a thin film sheet resistive material. A thin film sheet resistive material refers to a film-like resistive material manufactured by methods such as vacuum deposition, DC or AC sputtering, or chemical deposition, and includes Ni-Co, Ta, Si, metal-ceramic resistive films and resistive thin film sheets such as Au-Cr and Ni-P.

[0026] In some embodiments, the resistance sheet material 310 is a graphite film material. Here, the graphite film material is a sheet-like structure with a certain thickness formed by laminating graphite films, and has characteristics such as high heat generation power and rapid temperature rise.

[0027] When a graphite film material is used for the resistance sheet material 310, the heating tube 300 is also called a graphite heating tube, and its heating core is made of graphite material. When a graphite heating tube is used for the heating tube 300, there are many advantages. 1. High-temperature stability: Graphite material itself possesses excellent high-temperature stability, maintaining good physical and chemical properties even in high-temperature environments. It is resistant to oxidation, burning, or melting, and can operate stably even in corrosive environments. Therefore, when used as a heating core for high-temperature heating, the heating tube 300 exhibits strong high-temperature stability. 2. Rapid temperature rise: Because graphite material itself has low thermal load and thermal inertia, when used as a heating core, it can respond quickly to changes in current, enabling rapid heating of the heating tube 300. On the other hand, when the power is turned off, the heating tube 300 cools down quickly. Therefore, by installing the heating tube 300, the heating speed of the cooking appliance 1000 can be improved. 3. High thermal conductivity and uniform heating: Due to the inherent properties of graphite material, when manufacturing using it, parameters such as the shape, dimensions, and heating power of the heating core can be flexibly designed, making it possible to meet the needs of different application scenarios. Furthermore, because graphite material itself has high thermal conductivity, even if the shape of the heating core is complex, heat can be transferred quickly, thereby avoiding heat accumulation and contributing to improved uniformity of heating of the surrounding temperature. Therefore, the heating tube 300 has the characteristic of heating food uniformly.

[0028] The cooking appliance 1000 of this invention employs a heating structure that combines a heating plate 600 and a heating tube. By placing food on the heating plate 600, it is possible to heat the food directly at the same time. The high temperature of the heating plate 600 is directly transferred to the food, achieving the effect of searing the bottom of the food. By placing the heating tube 300 above the food and searing the top of the food, the temperature inside the heating chamber 102 is rapidly increased, allowing the food to be heated quickly in an appropriate temperature environment. Practical measurements have shown that, under the same conditions, a similar cooking appliance 1000 with a heating tube 300 heats up several times faster than one with a conventional metal heating tube.

[0029] Such a combination of methods not only improves the cooking speed of ingredients, but also helps to achieve the effect of searing the top and bottom surfaces of ingredients at high temperatures by utilizing the high thermal conductivity and uniform heating of the heating tube 300. Such a cooking appliance 1000 is particularly suitable for use as a pizza oven to make pizza, as it can quickly raise the heating chamber 102 to a preheating temperature before the pizza dough is placed in the heating chamber 102, and can also quickly sear the pizza inside the heating chamber 102, improving the texture of the pizza.

[0030] In some embodiments, as shown in Figures 2-5, forming the resistive sheet material 310 into a sheet shape avoids the problem of excessive total power due to low resistance, and further prevents excessive power density in the heat-generating region 311 of the resistive sheet material 310, thereby extending the service life of the cooking appliance 1000.

[0031] The angle between the resistance sheet material 310 and the heating plate 600 is the heating angle θ, and the range of the heating angle θ is 0 degrees to 90 degrees. Here, it can be understood that, since food is placed on the upper surface of the heating plate 600, the heating angle θ usually refers to the angle between the surface on which the resistance sheet material 310 is located and the upper surface of the heating plate 600. In this application, the angle between the surface on which the resistance sheet material 310 is located and the upper surface of the heating plate 600 can be adjusted as needed, and the angle range is not limited, hence the statement that the range of the heating angle θ is 0 degrees to 90 degrees.

[0032] Furthermore, the resistance sheet material 310 is elongated, and its longitudinal direction substantially coincides with the entire longitudinal direction of the heating tube 300. The resistance sheet material 310 may also be a flat sheet, in which case the heating angle θ between any point on the resistance sheet material 310 and the heating plate 600 is always the same. The resistance sheet material 310 may also be a curved sheet, in which case there is a difference in the heating angle θ between different points on the resistance sheet material 310 and the heating plate 600. Furthermore, there may be one or at least two heating tubes 300, and if there are at least two heating tubes 300, the shapes of each of the two heating tubes 300 may be the same or different. The at least two resistance sheet materials 310 inside may be two parallel flat sheets, or at least two flat sheets with different inclination angles, or at least two curved sheets with different shapes, and are not limited thereto.

[0033] In the embodiment shown in Figure 2, three heating tubes 300 are provided inside the cooking appliance 1000, and a resistance sheet material 310 is provided inside each of the three heating tubes 300. Since all three resistance sheet materials 310 are planar sheets provided parallel to the heating plate 600, the heating angle θ of all three resistance sheet materials 310 is 0 degrees.

[0034] In the embodiment shown in Figure 3, three heating tubes 300 are provided inside the cooking appliance 1000, and a resistance sheet material 310 is provided inside each of the three heating tubes 300, and all three resistance sheet materials 310 are flat sheets. Two of the resistance sheet materials 310 are provided at an inclination with respect to the upper surface of the heating plate 600, and the heating angles θ of the two front and rear resistance sheet materials 310 in Figure 3 are both acute angles. The central resistance sheet material 310 is a flat sheet provided parallel to the heating plate 600, and the heating angle θ of this resistance sheet material 310 is 0 degrees.

[0035] Furthermore, in the embodiment shown in Figure 4, three heating tubes 300 are provided inside the cooking appliance 1000, and a resistance sheet material 310 is provided inside each of the three heating tubes 300, and all three resistance sheet materials 310 are flat sheets. Two of the resistance sheet materials 310 are provided at an inclination with respect to the upper surface of the heating plate 600, and the heating angles θ of the two front and rear resistance sheet materials 310 in Figure 4 are both acute angles. The central resistance sheet material 310 is a flat sheet provided perpendicular to the heating plate 600, and the heating angle θ of this resistance sheet material 310 is 90 degrees.

[0036] In some embodiments, the heating tube 300 is rotatably connected to the housing 100, and the heating angle θ between the resistance sheet material 310 and the heating plate 600 is adjusted according to the operating state.

[0037] The cooking appliance 1000 is further equipped with a rotary drive device (not shown), which is connected to the heating tube 300 and rotates the heating tube 300 around its axis of rotation. Since the heating core of the heating tube 300 is a sheet-shaped resistance sheet material 310, the heating angle θ of the resistance sheet material 310 changes during rotation, which in turn changes the position of the heat radiation from the resistance sheet material 310, and as a result the cooking appliance 1000 obtains a more uniform heating effect.

[0038] As can be understood, because the resistance sheet material 310 is in sheet form, the heat density generated from the position directly opposite the resistance sheet material 310 is relatively high. When the resistance sheet material 310 is rotated until the heating angle θ is 0 degrees, more heat from the resistance sheet material 310 is radiated to the food above the heating plate 600, allowing the food to be grilled at a high temperature. When the resistance sheet material 310 is rotated until the heating angle θ is approximately 90 degrees, more heat from the resistance sheet material 310 is radiated to the surrounding air, the air in the heating chamber 102 maintains a high temperature, and thus the food is in a high-temperature air environment. Therefore, since the heating tube 300 is rotatable, the food can obtain the above heating conditions simultaneously.

[0039] Here, the rotation axis of the heating tube 300 may coincide with the axis of the heating tube 300's body, or there may be a certain offset from the axis of the body; there are no limitations here. When the heating tube 300 is rotatable, it is usually a straight tube, and also a circular tube. In this way, the space occupied by the movement of the heating tube 300 when it rotates is small, which reduces the probability of interference with other parts or food ingredients.

[0040] Of course, in the present invention, the shape of the heating tube 300 is not limited to a straight tube, but may be a curved tube as shown in Figures 6 and 7.

[0041] In some embodiments, as shown in Figures 2 to 5, there are multiple heating tubes 300, and these multiple heating tubes 300 are arranged in a row above the heating plate 600. This helps to improve the uniformity of heating throughout the heating chamber 102.

[0042] As shown in Figures 3 and 4, the distance between the two outermost heating tubes 300 and their resistance sheet materials 310 gradually decreases as they move upward. In other words, the lower surfaces of the two outermost resistance sheet materials 310 are not positioned facing directly downward, but are tilted at a certain angle toward the center of the heating plate 600, and the heating angle θ of these two resistance sheet materials 310 may be acute. In this way, the heat generated by these two resistance sheet materials 310 is distributed less at the edges of the heating plate 600 and more in the central region of the heating plate 600. As can be understood, when users place food on the heating plate 600, they tend to place the food in the central region of the heating plate 600 to prevent it from flying off. Therefore, by setting the heating angle θ of the resistance sheet materials 310 on both sides to an acute angle, more heat is concentrated in the central region of the heating plate 600, reducing wasted heat.

[0043] When the number of heating tubes 300 exceeds two, the heating angle θ of the resistance sheet material 310 of the central heating tube 300 can be flexibly set as needed, as specifically shown in Figures 3 and 4.

[0044] In some embodiments, as shown in Figures 2-4 and 7, the top wall of the heating chamber 102 is flat, and the heating tube 300 fits against the top wall of the heating chamber 102. As shown in Figures 2-4, the heating tube 300 is a straight tube parallel to the top wall of the heating chamber 102. Also, as shown in Figure 7, although the heating tube 300 is a curved tube, the surface located after the curve is still parallel to the top wall of the heating chamber 102, so the height of the space occupied by the heating tube 300 is small and does not encroach on the space of the food.

[0045] In some other embodiments, as shown in Figures 5 and 6, the top wall of the heating chamber 102 is an arched top that rises upward in an arch shape, and the heating tube 300 fits into the top wall of the heating chamber 102.

[0046] For example, in Figure 5, at least a portion of the top wall of the heating chamber 102 is a cylindrical surface, the center of the cylindrical surface is arched upward, and both the front and rear edges of the cylindrical surface extend downward. The heating chamber 102 has three heating tubes 300, each of which is a straight tube installed along the left-right direction. The central heating tube 300 is positioned higher, while the two front and rear heating tubes 300 are positioned lower, so that the distance between all three heating tubes 300 and the cylindrical surface is the same.

[0047] For example, in Figure 6, at least a portion of the top wall of the heating chamber 102 is a cylindrical surface, the center of the cylindrical surface is arched upward, and both the left and right sides of the cylindrical surface extend downward. The heating chamber 102 has three heating tubes 300, each of which is a curved tube running along the left-right direction. Because the center of the heating tubes 300 is high and the left and right ends are low, the distance between the three heating tubes 300 and the cylindrical surface is the same.

[0048] In some embodiments of the present invention, the resistance sheet material 310 is a rectangular sheet, which has a simple shape and is easy to process.

[0049] In some other embodiments of the present invention, the resistance sheet material 310 is a rectangular sheet that has been further modified.

[0050] As shown in Figures 8-9, the resistance sheet material 310 includes at least one heating region 311 that extends along the longitudinal direction of the heating tube 300. If there are at least two heating regions 311, a central region 312 is connected between each pair of adjacent heating regions 311, and the shape of the central region 312 and the heating regions 311 are different.

[0051] In other words, the resistive sheet material 310 is designed to be divided into multiple segments in the longitudinal direction, with the heat-generating regions 311 designed at an optimal angle for heat generation, while the central region 312 functions as a transient connection. By providing the central region 312, two adjacent heat-generating regions 311 are isolated from each other, preventing excessive heat concentration. When the heat-generating core radiates heat into the cavity, the temperature in the cavity near the center of the heat-generating core is higher. By providing the central region 312, the two adjacent heat-generating regions 311 are isolated from each other, resulting in more uniform heat radiation from the heat-generating core. Furthermore, by providing the central region 312, it is possible to adjust the length of the central region 312 according to different scenarios, allowing the lengths of the two adjacent heat-generating regions 311 to adapt to the changes, thereby enabling dynamic distribution to power changes.

[0052] The resistance sheet material 310 is manufactured with graphite as its main component and has a flattened structure, which forms a planar heating element. Compared to conventional heating wires, it has higher heating efficiency, faster response speed, and faster heating rate, allowing for greater energy concentration and achieving the effect of crispy outside and tender inside when cooking food.

[0053] As shown in Figures 8 and 9, the heat-generating core needs to extend along a specific direction for a certain length, and since the resistive sheet material 310 forms planar heat generation, in order to form a larger heat-generating area in a limited length, the resistive sheet material 310 is provided with a heat-generating region 311, and the resistive sheet material 310 mainly dissipates heat through the heat-generating region 311, and the heat-generating region 311 includes multiple heat-generating units 311A, where multiple means two and more than two, and the multiple heat-generating units 311A ​​are connected in series, that is, the current flowing through each heat-generating unit 311A ​​is uniform. As shown in Figures 9 and 10, the heating unit 311A ​​includes four parts, which are the fourth part 311d, the third part 311c, the second part 311b, and the first part 311a. The third part 311c and the first part 311a extend for a fixed length along the first direction, and the fourth part 311d and the second part 311b extend for a fixed length along the second direction. The first direction intersects the second direction. As a result, the fourth part 311d, the third part 311c, the second part 311b, and the first part 311a are connected in sequence, forming an uneven structure. Multiple heating units 311A ​​are connected in series, and the first part 311a and the fourth part 311d of adjacent heating units 311A ​​are connected, so that the heating region 311 constitutes a continuous uneven structure. To make it clear, connection here means to be integrated and joined together. For example, the fourth part 311d, the third part 311c, the second part 311b, and the first part 311a may be integrally molded, and the multiple heating units 311A ​​may also be integrally molded structures.

[0054] Since the second direction is defined as the extension direction of the resistance sheet material 310, at least a portion of the resistance sheet material 310 forms a continuous undulating structure along the extension direction of the resistance sheet material 310. In the extension direction of the resistance sheet material 310, there are portions of the resistance sheet material 310 that extend in different directions (the fourth portion 311d and the second portion 311b extend in the same direction, and the third portion 311c and the first portion 311a extend in the same direction), so that the resistance sheet material 310 can have a large heat-generating area without reducing resistance within a limited space (extension length of the resistance sheet material 310).

[0055] As shown in Figure 9, the first direction is perpendicular to the second direction, meaning that the fourth portion 311d and the second portion 311b basically extend along the extending direction of the resistance sheet material 310, and the third portion 311c and the first portion 311a basically extend perpendicular to the second direction. In this way, the structural processing of the fourth portion 311d, the third portion 311c, the second portion 311b and the first portion 311a in the heating unit 311A ​​is convenient, the overall structure is more stable and space can be utilized to the fullest extent.

[0056] As shown in Figure 9, in some embodiments of the present invention, there are two heat-generating regions 311, and the two heat-generating regions 311 are defined as two adjacent heat-generating regions 311, with the heat-generating region 311 on the left in Figure 9 being one heat-generating region 311 and the heat-generating region 311 on the right being the other heat-generating region 311. The resistive sheet material 310 further includes a central region 312, which is provided between the two adjacent heat-generating regions 311 and is connected to one heat-generating region 311 and the other heat-generating region 311. The central region 312 provides an electrical connection with the two adjacent heat-generating regions 311 and plays a role in transmitting current. By providing the central region 312, the two adjacent heat-generating regions 311 are isolated from each other, and excessive heat concentration is avoided.

[0057] As shown in Figure 9, in some embodiments of the present invention, the resistive sheet material 310 further includes a connection region located at the end of the resistive sheet material 310, and the provision of the connection region enables electrical connection between the heating core and the external member, for example, by providing a support point for a fixed lead wire, the lead wire can be fixed to the connection region, and the other end of the lead wire can be connected to another member (e.g., a connection terminal). Providing the connection region facilitates communication of the heating core.

[0058] In some embodiments, the resistive sheet material 310 dissipates heat mainly through a heat-generating region 311, the heat-generating region 311 includes a plurality of heat-generating units 311A, and the total resistance of the heat-generating region 311 can be calculated by adding up the resistances of each heat-generating unit 311A.

[0059] As shown in Figure 10, in some embodiments of the present invention, in order to enhance the seismic resistance of the resistance sheet material 310, the intersection of the fourth portion 311d and the third portion 311c forms an arc-shaped transient, the intersection of the third portion 311c and the second portion 311b forms an arc-shaped transient, the intersection of the second portion 311b and the first portion 311a forms an arc-shaped transient, and the intersection of the fourth portion 311d and the first portion 311a of two adjacent heat-generating units 311A ​​also forms an arc-shaped transient, thereby reducing stress concentration.

[0060] In order to enhance the heat generation capacity of the resistive sheet material 310, the present invention is not limited to forming the heat-generating region 311 of the resistive sheet material 310 in a rectangular waveform, as shown in Figures 9 and 10. It is also possible to form the heat-generating region 311 of the resistive sheet material 310 in a sinusoidal waveform, as shown in Figure 11. That is, at least one heat-generating region 311 can be formed in a waveform.

[0061] In some other embodiments, as shown in Figure 12, perforations 311e are provided in at least one heat-generating region 311. In this way, the amount of material used for the resistance sheet material 310 is reduced, the weight is reduced, and localized temperature excesses can be avoided due to heat overconcentration within the heat-generating region 311.

[0062] As shown in Figure 12, the heat-generating region 311 is provided with multiple perforations 311e arranged in multiple rows and multiple columns.

[0063] In the above embodiment, the central region 312 is a flat region. If it is necessary to change according to the shape of the top wall of the heating chamber 102, the central region 312 can also be a suitable arc-shaped region. In this way, the shape options for the central region 312 are diversified, making it possible to connect the heating region 311 while simultaneously meeting the overall shape requirements.

[0064] In some embodiments, as shown in Figure 8, the heating tube 300 further comprises an outer tube 320, the resistance sheet material 310 is provided inside the outer tube 320, and the inside of the outer tube 320 is filled with an inert gas. By providing the outer tube 320, the resistance sheet material 310 is protected and the probability of the resistance sheet material 310 breaking when subjected to impact is reduced. Furthermore, the probability of surface oxidation of the resistance sheet material 310 at high temperatures can also be reduced.

[0065] The outer tube 320 may be a glass tube, the resistance sheet material 310 is fitted inside the outer tube 320, both ends of the resistance sheet material 310 are connected to lead wires, and connection terminals are provided at both ends of the outer tube 320, the lead wires are connected to the connection terminals, and the connection terminals are suitable for connection to other power supply components. The inside of the outer tube 320 is filled with an inert gas, which may be helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), etc., and when current is applied the resistance sheet material 310 is in a state of high temperature generation, and by providing an inert gas the resistance sheet material 310 is protected and its service life is extended.

[0066] In some embodiments, as shown in Figure 13, the heating plate 600 comprises a cover case 610 and an auxiliary heating core 620, the cover case 610 being flat, the upper surface of the cover case 610 being used to place food on, and the auxiliary heating core 620 being provided inside the cover case 610.

[0067] By providing the cover case 610, the auxiliary heating core 620 is adequately protected, reducing the probability of contamination of the auxiliary heating core 620 by oil stains and water vapor, and extending the service life of the heating plate 600.

[0068] The auxiliary heating core 620 comprises at least one of the following: a metal heating core 621 and a graphite heating core 622. If a metal heating core 621 is used, it may be a metal wire, a metal plate, or the like.

[0069] As shown in Figure 13, the auxiliary heating core 620 includes multiple graphite heating cores 622, each of which is a horizontally positioned film-like sheet distributed at intervals along the horizontal direction. In this way, the total area surrounded by the distribution of the graphite heating cores 622 is increased, thereby increasing the heating area of ​​food placed above.

[0070] In some embodiments, the top wall of the cover case 610 is a transparent wall, and at least the bottom surface of the inner surface of the cover case 610 is a reflective surface. In this way, the reflective surface is used to increase heat reflectivity and concentrate more heat into the food and the heating chamber 102.

[0071] The housing 100 concentrates heat into the heating chamber 102 by providing an insulating layer (not shown) around the heating chamber 102, thereby reducing heat loss and waste.

[0072] In some embodiments, as shown in Figure 14, the cooking appliance 1000 is equipped with a controller 700, which is electrically connected to both the heating tube 300 and the heating plate 600. The controller 700 controls both the heating tube 300 and the heating plate 600 to operate during the preheating phase. In this way, before food is added, both the heating tube 300 and the heating plate 600 heat the heating chamber 102, increasing the rate at which the heating chamber 102 heats up, thus quickly completing preheating and reducing waiting time.

[0073] During the heating phase, the controller 700 controls the heating tube 300 and the heating plate 600 to heat alternately, thereby allowing the top and bottom surfaces of the food to be seared while simultaneously reducing heat consumption and preventing burning due to localized overheating.

[0074] In the means of this invention, the cooking appliance 1000 may be an appliance that requires heating, such as an electric oven, microwave oven, or steam oven.

[0075] In some embodiments, the cooking appliance 1000 is a pizza oven, employing a combination of a heating plate 600 and a heating tube 300 when baking pizza, which is particularly suitable for the rapid preparation of pizza.

[0076] The specific structure and operating principle of the controller 700 in the cooking appliance 1000 according to the embodiment of this application are known to those skilled in the art and will not be described in detail here.

[0077] In this specification, any reference to terms such as “Examples” or “Examples” means that the specific features, structures, materials, or properties described with reference to such Examples are included in at least one Example of this Application. In this specification, the general expressions of the above terms do not necessarily apply to the same Examples. In addition, any specific features, structures, materials, or properties described may be incorporated in an appropriate manner in any one or more Examples.

[0078] Although embodiments of this application have been presented and described, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this application, and that the scope of this application is limited by the claims and their equivalents.

[0079] [Cross-reference of related applications] This application claims priority to the Chinese Patent Application No. "202311224049.0" filed by Guangdong Midea Kitchen Appliance Manufacturing Co., Ltd. on September 20, 2023, with the title "Cooking Appliances".

Claims

1. It is a cooking utensil, A housing with a heating chamber defined inside, A heating plate is provided in the aforementioned heating chamber for placing food on, A cooking appliance comprising: a heating chamber provided therein, with at least one heating tube provided above the heating plate at a distance from it, wherein the heating core of the heating tube is made of a resistance sheet material.

2. The cooking utensil according to claim 1, wherein the resistance sheet material is a metal sheet material.

3. The cooking utensil according to claim 1, wherein the resistance sheet material is a thin film sheet.

4. The cooking utensil according to claim 3, wherein the resistance sheet material is a graphite film material.

5. The cooking appliance according to claim 1, wherein the angle between the resistance sheet material and the heating plate is the heating angle, and the range of the heating angle is 0 degrees to 90 degrees.

6. The cooking appliance according to claim 5, wherein the heating tube is rotatably connected to the housing and the heating angle of the resistance sheet material is adjusted according to the operating state.

7. The heating tubes are a plurality of, and the plurality of heating tubes are arranged in a row above the heating plate. The cooking appliance according to claim 5, wherein the distance between the resistance sheet material of the two outermost heating tubes gradually decreases as it moves upward.

8. The cooking appliance according to claim 3, wherein the resistance sheet material includes at least one heating region extending along the longitudinal direction of the heating tube, and if there are at least two heating regions, a central region is connected between each of the two adjacent heating regions, and the shape of the central region and the heating regions are different.

9. The cooking utensil according to claim 8, wherein at least one heating region includes a plurality of heating units connected in series, the heating units include a first portion, a second portion, a third portion and a fourth portion connected sequentially, two adjacent heating units are connected by the first portion and the fourth portion, the first portion and the third portion extend along a first direction, the second portion and the fourth portion extend along a second direction, the second direction being the longitudinal direction of the resistance sheet material and intersecting the first direction.

10. The cooking appliance according to claim 8, wherein at least one of the heating regions is waveform.

11. The cooking utensil according to claim 8, wherein a perforation is provided in at least one of the heating regions.

12. The cooking utensil according to claim 8, wherein the central region is an arc-shaped region or a flat region.

13. The cooking appliance according to claim 1, wherein the heating tube further includes an outer tube, the resistance sheet material is provided inside the outer tube, and the inside of the outer tube is filled with an inert gas.

14. The cooking appliance according to claim 1, wherein the top wall of the heating chamber is a flat wall or an arched top that rises upward in an arch shape, and the heating tube fits into the top wall of the heating chamber.

15. The aforementioned heating plate is It is flat, and the top surface is a cover case used for placing food on, The cooking appliance according to claim 1, further comprising an auxiliary heating core provided within the cover case.

16. The cooking appliance according to claim 15, wherein the auxiliary heating core comprises at least one of a metal heating core and a graphite heating core.

17. The cooking utensil according to claim 16, wherein the auxiliary heating core includes a plurality of graphite heating cores, each of which is a horizontally arranged film-like sheet and distributed at intervals along the horizontal direction.

18. The cooking utensil according to claim 15, wherein the top wall of the cover case is a transparent wall, and at least the bottom surface of the inner surface of the cover case is a reflective surface.

19. The cooking appliance according to claim 1, comprising a controller, wherein the controller is electrically connected to both the heating tube and the heating plate, and the controller controls both the heating tube and the heating plate to operate during the preheating stage.

20. The cooking appliance according to claim 19, wherein the controller controls the heating tube and the heating plate to be heated alternately during the heating stage.

21. The cooking appliance according to claim 1, wherein the cooking appliance is a pizza oven.

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