CN117158795A - Cooking utensil - Google Patents

Abstract

The application discloses a cooking appliance, comprising: a housing defining a heating cavity therein; the heating plate is arranged in the heating cavity and is used for accommodating food materials; the heating pipes are arranged in the heating cavity, at least one heating pipe is arranged above the heating plate at intervals, and the heating cores of the heating pipes are resistance sheets. According to the cooking utensil disclosed by the application, a heating structure scheme of combining the heating plate and the heating pipe is adopted, and the heating plate is used for holding food materials and simultaneously can directly heat the food materials so as to achieve the effect of roasting the food materials. The heating pipe is arranged above the food, so that the temperature in the heating cavity can be quickly increased, and the food can be quickly heated in a proper temperature environment. According to the combination scheme, the cooking speed of the food material can be improved, and the upper surface and the lower surface of the food material can be roasted at high temperature by utilizing the high heat conductivity and the heating uniformity of the heating pipe.

Description

Cooking utensil

Technical Field

The application relates to the field of cooking appliances.

Background

At present, most of cooking appliances for cooking food materials such as pizza adopt a mode that a plurality of heating pipes are distributed in a heating cavity to heat the food materials in a large area. The heating pipes are mostly metal pipes, and the heat on the surfaces of the metal pipes is uniformly dispersed, so that more waste is caused.

In some cooking appliances, the food is heated by electromagnetic waves, but a leakage preventing structure for electromagnetic waves needs to be provided on a housing of the cooking appliance, so that the cost is high and the power consumption is high. Therefore, the design of the cooking utensil with low cost and high heat utilization rate is one of the demands of the current market.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides the cooking appliance which has high heat utilization rate and low cost.

According to an embodiment of the present application, a cooking appliance includes: a housing defining a heating cavity therein; the heating plate is arranged in the heating cavity and is used for accommodating food materials; the heating pipes are arranged in the heating cavity, at least one heating pipe is arranged above the heating plate at intervals, and the heating cores of the heating pipes are resistance sheets.

According to the cooking utensil disclosed by the application, a heating structure scheme of combining the heating plate and the heating pipe is adopted, and the heating plate is used for holding food materials and simultaneously can directly heat the food materials, so that the high temperature of the heating plate is directly transmitted to the food materials, and the effect of roasting the bottom of the food materials is achieved. The heating pipe is arranged above the food, and the top of the food is roasted, so that the temperature in the heating cavity can be quickly increased, and the food can be quickly heated in a proper temperature environment. The heating plate is adopted to hold food materials, and the positions of the food materials are relatively determined. The heating core of the heating pipe is a resistance sheet, and the resistance sheet is arranged in the direction required by the food by utilizing the directional heating performance of the heating pipe, so that the heating efficiency of the food or the cooking taste is improved. The scheme has the advantages of controllable cost and higher heat utilization rate.

According to the combination scheme, the cooking speed of the food material can be improved, and the upper surface and the lower surface of the food material can be roasted at high temperature by utilizing the high heat conductivity and the heating uniformity of the heating pipe.

In some embodiments, the resistive sheet is a metal sheet.

In other embodiments, the resistive sheet is a thin film sheet.

Specifically, the resistance sheet is a graphite film.

In some embodiments, the resistive sheet is at an included angle to the heating plate, the included angle being in the range of 0-90 degrees.

In some embodiments, the heating tube is rotatably connected to the housing to adjust the heating angle of the resistive sheet according to an operating state.

In some embodiments, the heating pipes are a plurality of, and the plurality of heating pipes are arranged side by side above the heating plate; the resistive sheets of the two outermost heating pipes are gradually reduced in distance in the upward direction.

In some embodiments, the resistive sheet includes at least one heat generation region extending along a length of the heating tube; when the number of the heating areas is at least two, an intermediate area is connected between every two adjacent heating areas, and the shape of the intermediate area is different from that of the heating areas.

In some embodiments, at least one of the heat generating regions comprises a plurality of heat generating units connected in series, the heat generating units comprising a first portion, a second portion, a third portion, and a fourth portion connected in sequence, two adjacent heat generating units being connected by the first portion and the fourth portion, the first portion and the third portion extending in a first direction, the second portion and the fourth portion extending in a second direction, the second direction being a length direction of the resistive sheet and intersecting the first direction.

In some embodiments, at least one of the heat generating regions is wavy.

In some embodiments, at least one of the heat generating areas is provided with perforations.

In some embodiments, the intermediate region is an arcuate region or a straight region.

In some embodiments, the heating tube further comprises: and the resistance sheet is arranged in the outer tube, and inert gas is filled in the outer tube.

In some embodiments, the top wall of the heating cavity is a flat wall or an upwardly arched dome, and the heating tube is adapted to the top wall of the heating cavity.

In some embodiments, the heating plate comprises:

the cover shell is in a flat plate shape, and the upper surface of the cover shell is used for containing food materials;

the auxiliary heating core is arranged in the housing.

In some embodiments, the auxiliary heating core comprises at least one of a metal heating core and a graphite heating core.

In some embodiments, the auxiliary heating core includes a plurality of graphite heating cores, and the graphite heating cores are all horizontally arranged film sheets and are distributed at intervals along the horizontal direction.

In some embodiments, the top wall of the housing is a transparent wall and at least a bottom surface of the interior surface of the housing is a reflective surface.

In some embodiments, the cooking appliance includes a controller electrically connected to both the heating tube and the heating plate, the controller controlling both the heating tube and the heating plate to operate in a preheating phase and controlling both the heating tube and the heating plate to alternately heat in a heating phase.

In some embodiments, the cooking appliance is a pizza oven.

Additional aspects and advantages of the 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 the application.

Drawings

The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a side view of a cooking appliance according to an embodiment of the present application;

FIG. 2 is a simplified internal structural layout of a cooking appliance of some embodiments;

FIG. 3 is a schematic view of an internal structural layout of a cooking appliance of other embodiments;

FIG. 4 is a schematic view of an internal structural layout of a cooking appliance of still other embodiments;

FIG. 5 is a simplified internal structural layout of a cooking appliance of still other embodiments;

FIG. 6 is a simplified internal structural layout of a cooking appliance of some embodiments;

FIG. 7 is a schematic view of an internal structural layout of a cooking appliance of still other embodiments;

FIG. 8 is a simplified schematic diagram of a heating tube of some embodiments;

FIG. 9 is a schematic structural view of the inner core of a heating tube of some embodiments;

FIG. 10 is a schematic view of the inner core of a heating tube of other embodiments;

FIG. 11 is a schematic structural view of the inner core of a heating tube of yet other embodiments;

FIG. 12 is a schematic structural view of the inner core of a heating tube of still other embodiments;

FIG. 13 is a schematic diagram of the structure of a heating plate of some embodiments;

fig. 14 is a schematic structural view of a cooking appliance of some embodiments.

Reference numerals:

cooking utensil 1000,

A housing 100, an opening 101, a heating chamber 102,

A door body 200,

A heating pipe 300,

Resistive sheet 310, heating angle θ,

A heat generating region 311, a heat generating unit 311A, a first portion 311A, a second portion 311b, a third portion 311c, a fourth portion 311d, perforations 311e, an intermediate region 312,

An outer tube 320,

Heating plate 600, housing 610, auxiliary heating core 620, metal heating core 621, graphite heating core 622, reflecting surface S1,

A controller 700.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

In the description of the present application, it should be understood that the terms "center", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

The cooking appliance 1000 according to an embodiment of the present application is described below with reference to the accompanying drawings, and the cooking appliance 1000 is used to heat food materials, and there is no limitation on the type of the cooking appliance 1000. Cooking appliance 1000 may be an oven or other type of appliance.

The cooking appliance 1000 according to an embodiment of the present application includes: a housing 100, a heating plate 600, and a heating tube 300.

As shown in fig. 1 and 2, the heating chamber 102 is defined in the casing 100, the casing 100 has an opening 101, the cooking apparatus 1000 further includes a door 200 for opening and closing the opening 101, and the door 200 may be located on a side surface, a top surface, or the like of the casing 100 without limitation. The heating plate 600 and the heating tube 300 are both disposed within the heating chamber 102. The heating plate 600 is located in the middle or lower position of the heating cavity 102, and the heating plate 600 is used for containing food materials.

Here, when the food material needs to be heated, the user may directly place the food material on the heating plate 600 according to personal habits, or the user may additionally set a tray or a bracket, place the food material with the tray or the bracket, and then place the tray or the bracket with the food material on the heating plate 600. Because the heating plate 600 can heat the food material, some cooking apparatuses 1000, such as the cooking apparatus 1000, are pizza ovens, and a user will choose to directly place the food material on the heating plate 600 when using, so that the heat of the heating plate 600 is directly transferred to the food material, the transfer path is short, the heat loss is less, the food material is kept at a higher heating temperature, and the heat utilization rate is improved. Here, the heating core structure of the heating plate 600 is not limited, and a metal heating core 621 (e.g., wire, metal plate, etc.), an infrared heater, a graphite heating core 622, etc. may be used, and the present application is not limited.

In the present application, at least one heating tube 300 is disposed above the heating plate 600 at a spaced apart distance. The heat generated by the heating tube 300 can heat the air in the heating cavity 102 and also can heat the food material on the heating plate 600, so that the food material is cooked.

Wherein the heating core of the heating tube 300 is a resistive sheet 310. Here, the resistive sheet 310 refers to a resistive material portion that can generate heat when energized, and the resistive material portion is sheet-shaped. Since the resistive material portion has a large surface area and emits a large amount of heat outward, the sheet-like resistive sheet 310 has directional heat generation properties, that is, the resistive sheet 310 generates a large amount of heat in a direction perpendicular to itself. Therefore, more heat can be absorbed when the heating plate 600 is parallel to the resistive sheet 310 on the premise of the same distance.

According to the scheme, the heating plate 600 is used for containing food materials, the heating pipe 300 is used for heating the food materials above the heating plate 600, and the positions of the food materials are relatively determined. The heating core of the heating tube 300 is the resistance sheet 310, and the resistance sheet 310 is arranged in a direction required by the food material by utilizing the directional heating performance of the resistance sheet, so that the heating efficiency of the food material or the cooking taste can be improved.

In some embodiments, the resistive sheet 310 is a metal sheet, whereby the resistive sheet 310 has good electrical and thermal conductivity properties.

Alternatively, the metal sheet may include an iron sheet, a copper sheet, a chromium sheet, a nickel sheet, a tungsten sheet, or the like.

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

When the resistive sheet 310 is a carbon sheet, it may be a graphite sheet, an activated carbon sheet, a bulk carbon sheet, or the like. When the resistive sheet 310 is a sheet of ceramic material, high temperature resistance, corrosion resistance of the ceramic material may be achieved. When resistive sheet 310 is a sheet of semiconductor material, it may include a silicon wafer, a germanium wafer, and the like. When the resistive sheet 310 is a clay material sheet, it may include a carbon clay sheet, a corona ceramic sheet, a porcelain insulator corona clay sheet, and the like.

In still other embodiments, the resistive sheet 310 is a thin film sheet, i.e., the resistive sheet 310 is a film sheet made of thin film resistive material. The film resistor material is film resistor material prepared by vacuum evaporation, DC or AC sputtering, chemical deposition, etc. and includes Ni-Co resistor film, ta resistor film, si resistor film, cermet resistor film, au-Cr resistor film, ni-P resistor film, etc.

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

When the resistive sheet 310 is made of a graphite film, the heating tube 300 may also be called a graphite heating tube, and the heating core is made of a graphite material. When the heating tube 300 adopts a graphite heating tube, the heating tube has a plurality of advantages and characteristics:

1. high temperature stability: because the graphite material has good high-temperature stability, can keep good physical and chemical properties in a high-temperature environment, is not easy to oxidize, burn through or melt, and can stably work in a corrosive environment, the graphite material is used as a heating core for high-temperature heating, and the high-temperature stability of the heating pipe 300 is strong.

2. The temperature rise speed is high: because the graphite material itself has a low thermal load and thermal inertia, it can respond quickly to a current change by acting as a heating core, so that the heating tube 300 can be heated quickly, whereas the cooling rate of the heating tube 300 is also fast once the power is off. The heating pipe 300 is thus provided, and the heating speed of the cooking appliance 1000 can be increased.

3. High thermal conductivity and heating uniformity: because graphite material own material characteristics, when using its preparation heating core, parameters such as shape, size and the heating power of heating core can design in a flexible way to satisfy the demand of different application scenario, in addition graphite material itself has higher heat conductivity, even if heating core shape is complicated, can both rapidly go out the heat transfer, thereby make the heat not pile up, be favorable to the homogeneity of surrounding temperature heating. Therefore, the heating pipe 300 has the characteristic of uniformly heating the food.

The cooking utensil 1000 adopts a heating structure scheme of combining the heating plate 600 and the graphite heating pipe, and can directly heat food materials while using the heating plate 600 to hold the food materials, so that the high temperature of the heating plate 600 is directly transferred to the food materials, and the effect of roasting the food materials is achieved. The heating pipe 300 is arranged above the food, so that the temperature in the heating cavity 102 can be quickly increased, and the food can be quickly heated in a proper temperature environment. According to practical measurement, the same cooking utensil 1000 adopts the heating speed of the heating pipe 300 to be several times faster than that of the common metal heating pipe under the same condition.

By adopting the combination scheme, the cooking speed of the food material can be improved, and the upper surface and the lower surface of the food material can be roasted at high temperature by utilizing the high heat conductivity and the heating uniformity of the heating pipe 300. The cooking appliance 1000 is particularly suitable for being used as a pizza oven for making pizzas, not only can enable the heating cavity 102 to reach the preheating temperature quickly before the pizza crust is placed into the heating cavity 102, but also can enable the pizza to be roasted quickly in the heating cavity 102, and improve the taste of the pizza.

In some embodiments, as shown in fig. 2-5, the resistive sheet 310 is formed into a sheet shape, so that the problem of overlarge total power caused by smaller resistance can be avoided, and then the overlarge power density of the heating area 311 of the resistive sheet 310 is avoided, so that the service life of the heating core 1000 is prolonged.

Specifically, the angle between the resistive sheet 310 and the heating plate 600 is a heating angle θ, which ranges from 0 to 90 degrees. It will be appreciated herein that since the upper surface of the heating plate 600 holds the food material, the heating angle θ generally refers to the angle between the surface of the resistive sheet 310 and the upper surface of the heating plate 600. In the present application, the angle between the surface of the resistive sheet 310 and the upper surface of the heating plate 600 can be adjusted as required, and the range of the angle is not limited, so that the heating angle θ is said to be in the range of 0-90 degrees.

The resistive sheet 310 is elongated, and the longitudinal direction of the resistive sheet 310 is substantially aligned with the entire longitudinal direction of the heating pipe 300. The resistive sheet 310 may be planar sheet-like in which case the heating angle θ sandwiched between any of the resistive sheet 310 and the heating plate 600 is equal. The resistive sheet 310 may also be a curved sheet where there is a difference in the heating angle θ between the heating plate 600 and the resistive sheet 310 at different positions. In addition, the heating pipes 300 may be one or at least two, and when the heating pipes 300 are at least two, the shape of each two heating pipes 300 may be the same or different. The at least two resistive sheets 310 may be two parallel planar sheets, the at least two resistive sheets 310 may be planar sheets with different inclination angles, the at least two resistive sheets 310 may be curved sheets with different shapes, and the like, which is not limited herein.

For example, in the embodiment shown in fig. 2, three heating pipes 300 are disposed in the cooking apparatus 1000, and one resistive sheet 310 is disposed in each of the three heating pipes 300, and the three resistive sheets 310 are each a planar sheet disposed parallel to the heating plate 600, so that the heating angles θ of the three resistive sheets 310 are all 0 degrees.

For example, in the embodiment shown in fig. 3, three heating pipes 300 are disposed in the cooking apparatus 1000, and a resistive sheet 310 is disposed in each of the three heating pipes 300, and each of the three resistive sheets 310 is a planar sheet. Wherein the two resistive sheets 310 are disposed obliquely with respect to the upper surface of the heating plate 600, as the heating angles θ of the front and rear resistive sheets 310 in fig. 3 are both acute angles. While the middle resistive sheet 310 is a planar sheet disposed parallel to the heating plate 600, the heating angle θ of the resistive sheet 310 is 0 degrees.

For example, in the embodiment shown in fig. 4, three heating pipes 300 are disposed in the cooking apparatus 1000, and a resistive sheet 310 is disposed in each of the three heating pipes 300, and the three resistive sheets 310 are all planar sheets. Wherein the two resistive sheets 310 are disposed obliquely with respect to the upper surface of the heating plate 600, as shown in fig. 4, the heat generation angles θ of the front and rear resistive sheets 310 are acute angles. While the middle resistive sheet 310 is a planar sheet disposed perpendicular to the heating plate 600, the heating angle θ of the resistive sheet 310 is 90 degrees.

In some embodiments, the heating tube 300 is rotatably connected to the housing 100 to adjust the heating angle θ between the resistive sheet 310 and the heating plate 600 according to the operation state.

Specifically, the cooking apparatus 1000 further includes a rotation driver (not shown) connected to the heating tube 300 to rotate the heating tube 300 around the rotation axis. Since the heating core of the heating pipe 300 is the sheet-shaped resistive sheet 310, the heating angle θ of the resistive sheet 310 is changed during rotation, and thus the facing position of the resistive sheet 310 to which heat is radiated is also changed, thereby achieving a more uniform heating effect of the cooking appliance 1000.

It will be appreciated that since the resistive sheet 310 is sheet-like, the resistive sheet 310 is relatively dense to the heat transmitted from the location. When the resistive sheet 310 is rotated to the heating angle θ of 0 degrees, heat of the resistive sheet 310 is more emitted to the food material above the heating plate 600, so that the food material can be roasted at a high temperature. When the resistance sheet 310 rotates to the heating angle θ of about 90 degrees, more heat of the resistance sheet 310 is emitted to the surrounding air, so that the air in the heating cavity 102 is kept at a high temperature, and the food material is in a high-temperature air environment. The rotatable arrangement of the heating tube 300 can thus allow the food material to be subjected to the heating conditions described above.

Here, the rotation axis of the heating tube 300 may be coincident with the tube axis of the heating tube 300, or may deviate from the tube axis by a certain degree, which is not limited herein. When the heating tube 300 is rotatable, the heating tube 300 is generally a straight tube, and further the heating tube 300 is a circular tube, so that the movement space occupied by the heating tube 300 when rotating is smaller, and the probability of interference with other parts and even food is reduced.

Of course, in the embodiment of the present application, the shape of the heating pipe 300 is not limited to a straight pipe, and may be a bent pipe as shown in fig. 6 and 7.

In some embodiments, as shown in fig. 2 to 5, the heating tube 300 is a plurality of heating tubes 300, and the plurality of heating tubes 300 are disposed side by side above the heating plate 600. This helps to improve the uniformity of heating across the heating chamber 102.

Specifically, as shown in fig. 3 and 4, the resistive sheets 310 of the two outermost heating pipes 300 are gradually reduced in distance in the upward direction. That is, the lower surfaces of the two outermost resistive sheets 310 are not disposed forward downward, but are inclined to some extent toward the middle of the heating plate 600, and the heat generation angle θ of the two resistive sheets 310 may be an acute angle. This causes the heat emitted from the two resistive sheets 310 to be less distributed at the edges of the heating plate 600 and more distributed toward the central region of the heating plate 600. It will be appreciated that to avoid the food material from flipping out of the heating plate 600 when the user places the food material on the heating plate 600, it may be preferable to place the food material on a central region of the heating plate 600. Therefore, the heating angles θ of the resistive sheets 310 on both sides are set to be acute angles, so that heat is more concentrated in the central region of the heating plate 600, and ineffective waste of heat is reduced.

When the number of heating pipes 300 exceeds two, the heating angle θ of the resistive sheet 310 of the heating pipe 300 positioned in the middle can be flexibly set as required, as shown in fig. 3 and 4.

In some embodiments, as shown in fig. 2-4 and 7, the top wall of the heating chamber 102 is a flat wall, and the heating tube 300 is adapted to the top wall of the heating chamber 102. As shown in fig. 2-4, the heating tube 300 is a straight tube parallel to the top wall of the heating chamber 102. As shown in fig. 7, the heating tube 300 is a bent tube, but the surface of the bent heating tube 300 is still parallel to the top wall of the heating cavity 102, so that the height space occupied by the heating tube 300 is small, and the space for eating food is not squeezed.

In other embodiments, as shown in fig. 5 and 6, the top wall of the heating chamber 102 is an upwardly arched dome, and the heating tube 300 is adapted to the top wall of the heating chamber 102.

For example, in fig. 5, at least part of the top wall of the heating chamber 102 is a cylindrical surface, the middle of the cylindrical surface is arched upwards, and the front edge and the rear edge of the cylindrical surface are both arranged in a downward extending manner. Three heating pipes 300 are arranged in the heating cavity 102, each heating pipe 300 is a straight pipe arranged along the left-right direction, the heating pipe 300 at the middle position is high, and the two heating pipes 300 at the front and the rear are low, so that the distances between the three heating pipes 300 and the cylindrical surface are consistent.

For example, in fig. 6, at least part of the top wall of the heating chamber 102 is a cylindrical surface, the middle of the cylindrical surface is arched upwards, and the left side and the right side of the cylindrical surface are both arranged in a downward extending manner. Three heating pipes 300 are arranged in the heating cavity 102, and each heating pipe 300 is an elbow arranged along the left-right direction. The middle position of the heating pipes 300 is high, and the left and right end positions are low, so that the distances between the three heating pipes 300 and the cylindrical surface are consistent.

In some embodiments of the present application, resistive sheet 310 is a rectangular sheet, simple in shape, and easy to process.

In other embodiments of the present application, the shape of the resistive sheet 310 is further varied on a rectangular sheet basis.

Specifically, as shown in fig. 8 to 9, the resistive sheet 310 includes at least one heat generating region 311 provided to extend in the longitudinal direction of the heating pipe 300. When there are at least two heat generating areas 311, an intermediate area 312 is connected between every two adjacent heat generating areas 311, and the intermediate area 312 is different from the heat generating areas 311 in shape.

That is, the resistive sheet 310 is designed in sections along the length direction, wherein the heat generating regions 311 are designed according to the most suitable heat generating angle, and the middle region 312 is used as a transitional connection, and the middle region 312 is arranged to separate two adjacent heat generating regions 311, so as to avoid excessive heat concentration. Because the temperature of the inner cavity near the middle of the heating core is higher when the heating core radiates heat to the inner cavity, the two adjacent heating areas 311 are separated by the middle area 312, so that the heat radiated by the heating core is more uniform. In addition, by setting the middle area 312, the length of the middle area 312 can be adjusted according to different scenes, so that the lengths of the two adjacent heating areas 311 are adapted to change, thereby realizing dynamic allocation of power change.

Specifically, the main component of the resistive sheet 310 is made of graphite, and forms a flat structure, so that the surface is heated, and therefore, compared with a traditional heating wire, the resistive sheet has higher heating efficiency, higher corresponding speed and higher heating speed, so that the energy is more concentrated, and the effect of burning and tendering the food is realized.

Generally, as shown in fig. 8 and 9, the heating core needs to extend a certain length along a certain direction, and since the resistive sheet 310 forms a surface heating, in order to form a larger heating area within a limited length, the resistive sheet 310 includes a heating area 311, and the resistive sheet 310 mainly emits heat through the heating area 311, the heating area 311 includes a plurality of heating units 311A, and the plurality of heating units 311A are connected in series, i.e. the current flowing through each heating unit 311A is uniform. As shown in fig. 9 and 10, the heat generating unit 311A includes four parts, which are a fourth part 311d, a third part 311c, a second part 311b and a first part 311A, respectively, wherein the third part 311c and the first part 311A extend a certain length along a first direction, and the fourth part 311d and the second part 311b extend a certain length along a second direction, and the first direction and the second direction intersect, so that the fourth part 311d, the third part 311c, the second part 311b and the first part 311A are sequentially connected to form a relief structure, and the first part 311A and the fourth part 311d of the adjacent heat generating unit 311A are connected together due to the fact that the plurality of heat generating units 311A are connected together in series, so that the heat generating region 311 forms a continuous relief structure. It is understood that the connection herein means that the fourth portion 311d, the third portion 311c, the second portion 311b and the first portion 311A are combined together, for example, may be integrally formed, and the plurality of heat generating units 311A also constitute an integrally formed structure.

The second direction is defined as the extending direction of the resistive sheet 310, and thus, at least part of the resistive sheet 310 constitutes a continuous undulating structure along the extending direction of the resistive sheet 310. Since the resistive sheet 310 has portions extending 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) in the extending direction of the resistive sheet 310, it is possible to provide the resistive sheet 310 with a larger heat generation area without lowering the resistance in a limited space (the extending length of the resistive sheet 310).

The first direction and the second direction are perpendicular as shown in fig. 9, that is, the fourth portion 311d and the second portion 311b extend substantially along the extending direction of the resistive sheet 310, and the third portion 311c and the first portion 311A extend substantially perpendicular to the second direction, so that the structural processing of the fourth portion 311d, the third portion 311c, the second portion 311b and the first portion 311A in the heat generating unit 311A is facilitated, the overall structure is more stable, and the space can be maximally utilized.

As shown in fig. 9, in some embodiments of the present application, the two heat generating areas 311 are defined as two adjacent heat generating areas 311, the heat generating area 311 located on the left side in fig. 9 is the heat generating area 311, the heat generating area 311 located on the right side is the other heat generating area 311, the resistive sheet 310 further includes an intermediate area 312, the intermediate area 312 is disposed between the two adjacent heat generating areas 311, and the intermediate area 312 is connected with the other heat generating area 311, and is further connected with the other heat generating area 311, the intermediate area 312 is electrically connected with the two adjacent heat generating areas 311, so as to perform a function of transmitting current, and the intermediate area 312 is disposed so that the two adjacent heat generating areas 311 are separated from each other, thereby avoiding excessive heat concentration.

In some embodiments of the application, as shown in fig. 9, the resistive sheet 310 further includes a connection region at an end of the resistive sheet 310, the connection region being configured to electrically connect the heater core to an external component, e.g., the connection region being configured to provide a support point for a fixed lead, which may be secured to the connection region, and the other end of the lead may be connected to another component (e.g., a connection terminal). Through setting up the connecting region, conveniently realize the circular telegram of heating core.

In some embodiments, the resistive sheet 310 radiates heat primarily through the heat generating region 311, and the heat generating region 311 includes a plurality of heat generating units 311A, and calculating the total resistance of the heat generating region 311 may be performed by summing the resistances of the respective heat generating units 311A.

In some embodiments of the present application, as shown in connection with fig. 10, in order to further enhance the shock resistance of the resistive sheet 310, the intersection of the fourth portion 311d and the third portion 311c forms an arc transition, the intersection of the third portion 311c and the second portion 311b forms an arc transition, the intersection of the second portion 311b and the first portion 311A forms an arc transition, the intersection of the fourth portion 311d and the first portion 311A of two adjacent heat generating units 311A also forms an arc transition, so that stress concentration can be reduced,

in the embodiment of the present application, in order to increase the heat generating capability of the resistive sheet 310, the shape of the rectangular wave of the heat generating region 311 of the resistive sheet 310 shown in fig. 9 and 10 may be not limited, and the heat generating region 311 of the resistive sheet 310 may be formed into a sine wave shape as shown in fig. 11. That is, at least one heat generating region 311 may be formed in a wave shape.

In still other embodiments, as shown in fig. 12, at least one heat generating region 311 is provided with perforations 311e, so as to reduce the material consumption of the resistive sheet 310, reduce the weight, and avoid excessive local temperature caused by excessive heat in the heat generating region 311.

Specifically, as shown in fig. 12, the heat generating region 311 is provided with a plurality of perforations 311e in a plurality of rows and columns.

In the above embodiment, the intermediate region 312 is a flat region. The intermediate zone 312 may also be formed as a suitably curved zone when it is desired to vary depending on the shape of the top wall of the heating chamber 102. Thus, the shape of the middle area 312 is selected variously, and the overall shape requirement can be met while the heat generating area 311 is connected.

In some embodiments, as shown in fig. 8, the heating tube 300 further comprises: the outer tube 320, the resistive sheet 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 resistive sheet 310 is protected from the chance of breaking the sheet 310 by impact She Dianzu. But also avoids the chance of surface oxidation of the resistive sheet 310 at high temperatures.

Alternatively, the outer tube 320 may be a glass tube, the resistive sheet 310 is inserted into the outer tube 320, two ends of the resistive sheet 310 are respectively connected with the leads, two ends of the outer tube 320 are respectively provided with connection terminals, the leads are connected with the connection terminals, and the connection terminals are suitable for being connected with other power supply components. Optionally, the outer tube 320 is filled with an inert gas, which may be helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), or the like, and the resistive sheet 310 is in a state of heating at a high temperature when energized, so that the resistive sheet 310 can be protected by the inert gas, and the service life of the resistive sheet 310 can be prolonged.

In some embodiments, as shown in fig. 13, the heating plate 600 includes: the casing 610 and the auxiliary heating core 620, the casing 610 is in a flat plate shape, the upper surface of the casing 610 is used for containing food materials, and the auxiliary heating core 620 is arranged in the casing 610.

The cover 610 not only provides enough protection for the auxiliary heating core 620, but also reduces the probability of oil contamination and water vapor pollution to the auxiliary heating core 620, and prolongs the service life of the heating plate 600.

Wherein the auxiliary heating core 620 includes at least one of a metal heating core 621 and a graphite heating core 622. When a metal heating core 621 is employed, it may be a wire, a metal plate, or the like.

Further, as shown in fig. 13, the auxiliary heating core 620 includes a plurality of graphite heating cores 622, and the plurality of graphite heating cores 622 are all horizontally arranged film sheets and are distributed at intervals along the horizontal direction. This can enlarge the total area surrounded by the distribution of the graphite heating cores 622 and increase the heated area of the upper food material.

In some embodiments, the top wall of the housing 610 is a transparent wall and at least the bottom surface of the interior surface of the housing 610 is a reflective surface. This allows the reflective surface to be used to enhance thermal reflectivity and to concentrate more heat within the food material and heating chamber 102.

Further, the casing 100 is provided with a heat insulating layer (not shown) around the heating cavity 102, so that heat is concentrated in the heating cavity 102, and heat loss and waste are reduced.

In some embodiments, as shown in fig. 14, the cooking appliance 1000 includes a controller 700, the controller 700 being electrically connected to both the heating pipe 300 and the heating plate 600, the controller 700 controlling both the heating pipe 300 and the heating plate 600 to operate in a preheating stage. Thus, when no food is put in, the heating pipe 300 and the heating plate 600 both heat the heating cavity 102, so that the heating speed of the heating cavity 102 is increased, the preheating is completed rapidly, and the waiting time is shortened.

Specifically, in the heating stage, the controller 700 controls the heating pipes 300 and the heating plates 600 to alternately heat, so that the upper and lower surfaces of the food material can be roasted, and simultaneously, heat can be saved, and the local temperature is prevented from being excessively raised to roast the food material.

In the present embodiment, the cooking apparatus 1000 may be an electric oven, a microwave oven, a steaming oven, or other devices that need to be heated.

In some embodiments, the cooking apparatus 1000 is a pizza oven, and the combination of the heating plate 600 and the heating tube 300 is adopted in the pizza baking process, which is particularly suitable for rapid pizza making.

The specific structure and operation of the controller 700 in the cooking appliance 1000 according to the embodiment of the present application are known to those skilled in the art, and will not be described in detail herein.

In the description herein, reference to the term "embodiment," "example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.

Claims (21)

1. A cooking appliance, comprising:

a housing defining a heating cavity therein;

the heating plate is arranged in the heating cavity and is used for accommodating food materials;

the heating pipes are arranged in the heating cavity, at least one heating pipe is arranged above the heating plate at intervals, and the heating cores of the heating pipes are resistance sheets.

2. The cooking appliance of claim 1, wherein the resistive sheet is a metal sheet.

3. The cooking appliance of claim 1, wherein the resistive sheet is a film sheet.

4. A cooking appliance according to claim 3, wherein the resistive sheet is a graphite film.

5. The cooking appliance of claim 1, wherein an included angle between the resistive sheet and the heating plate is a heating angle, the heating angle ranging between 0-90 degrees.

6. The cooking appliance of claim 5, wherein the heating tube is rotatably connected to the housing to adjust the heating angle of the resistive sheet according to an operating state.

7. The cooking appliance of claim 5, wherein a plurality of heating pipes are provided, the plurality of heating pipes being arranged side by side above the heating plate;

the resistive sheets of the two outermost heating pipes are gradually reduced in distance in the upward direction.

8. A cooking appliance according to claim 3, wherein the resistive sheet comprises at least one heat generating region extending along the length of the heating tube; when the number of the heating areas is at least two, an intermediate area is connected between every two adjacent heating areas, and the shape of the intermediate area is different from that of the heating areas.

9. The cooking appliance of claim 8, wherein at least one of the heat generating zones comprises a plurality of heat generating units connected in series, the heat generating units comprising a first portion, a second portion, a third portion, and a fourth portion connected in sequence, adjacent two of the heat generating units being connected by the first portion and the fourth portion, the first portion and the third portion extending in a first direction, the second portion and the fourth portion extending in a second direction, the second direction being a length direction of the resistive sheet and intersecting the first direction.

10. The cooking appliance of claim 8, wherein at least one of the heat generating areas is wave-shaped.

11. The cooking appliance of claim 8 wherein at least one of said heat generating areas is provided with perforations.

12. The cooking appliance of claim 8, wherein the intermediate zone is an arcuate zone or a flat zone.

13. The cooking appliance of claim 1, wherein the heating tube further comprises: and the resistance sheet is arranged in the outer tube, and inert gas is filled in the outer tube.

14. Cooking appliance according to claim 1, wherein the top wall of the heating cavity is a flat wall or an upwardly arched dome, and the heating tube is adapted to the top wall of the heating cavity.

15. The cooking appliance of any one of claims 1-14, wherein the heating plate comprises:

the cover shell is in a flat plate shape, and the upper surface of the cover shell is used for containing food materials;

the auxiliary heating core is arranged in the housing.

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

17. The cooking appliance of claim 16, wherein the auxiliary heating core comprises a plurality of graphite heating cores, and the graphite heating cores are all horizontally arranged film sheets and are distributed at intervals along the horizontal direction.

18. The cooking appliance of claim 15, wherein the top wall of the enclosure is a transparent wall and at least a bottom surface of the interior surface of the enclosure is a reflective surface.

19. The cooking appliance of any one of claims 1-14, comprising a controller electrically connected to both the heating tube and the heating plate, the controller controlling both the heating tube and the heating plate to operate during a warm-up phase.

20. The cooking appliance of claim 19, wherein the controller controls the heating pipes and the heating plates to alternately heat during a heating phase.

21. Cooking appliance according to any one of claims 1-14, characterized in that the cooking appliance is a pizza oven.