CN219645557U

CN219645557U - Heating tube assembly and cooking apparatus

Info

Publication number: CN219645557U
Application number: CN202320335877.0U
Authority: CN
Inventors: 陈荣武; 吕华
Original assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Current assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Priority date: 2023-02-15
Filing date: 2023-02-15
Publication date: 2023-09-08
Anticipated expiration: 2033-02-15

Abstract

The embodiment of the utility model provides a heating tube assembly and cooking equipment, wherein the heating tube assembly comprises: the heating disc body comprises a central part and an edge part, wherein the central part is positioned in the central area of the heating disc body, the edge part is positioned at the periphery of the central part, and the power density of the central part is greater than that of the edge part. According to the heating tube assembly provided by the embodiment of the aspect, the power density of the central part is larger than that of the edge part, so that the heating disc body is in a distribution state that the temperature of the central part is higher than that of the edge part. The embodiment of the aspect provides a heating tube component with unevenly distributed power density, which realizes high power density inside and low power density outside in the diameter direction of a heating disc body, so that the heat radiation transfer effect is also high inside and low outside, and the problem of low temperature of a convection heat transfer center in a cooking cavity of cooking equipment in the related technology is solved.

Description

Heating tube assembly and cooking apparatus

Technical Field

The utility model relates to the technical field of kitchen appliances, in particular to a heating tube assembly and cooking equipment.

Background

Heating pipes are adopted as heating components in common air fryers, and most of the heating pipes are arranged at the top of the fryers, and the circulating fan drives the internal air to be circularly heated. Because convection heat transfer is the main part and radiation heat transfer is the auxiliary part in the working process of the air fryer, the heat of the heating pipe in the prior art is uniformly distributed, and the heat of the heat radiation is also uniformly distributed, and the convection heat transfer can form a low-temperature backflow area below the centrifugal fan, so that the problem of lower temperature at the low temperature is caused, and the phenomena of high peripheral temperature and low middle temperature in the cooking cavity of the air fryer are caused, so that the phenomena of burning all around and middle clamping are easy to occur in the food cooking process.

Disclosure of Invention

The present utility model is directed to solving at least one of the above-mentioned problems occurring in the prior art or related art.

To this end, a first aspect of the present utility model is to provide a heat generating tube assembly.

A second aspect of the present utility model is to provide a cooking apparatus.

An embodiment of a first aspect of the present utility model provides a heating tube assembly for a cooking apparatus, the cooking apparatus including a cooking cavity in which the heating tube assembly is disposed, the heating tube assembly comprising: the heating disc body comprises a central part and an edge part, wherein the central part is positioned in the central area of the heating disc body, the edge part is positioned at the periphery of the central part, and the power density of the central part is greater than that of the edge part.

The heating tube assembly provided by the embodiment of the aspect comprises the heating disc body, wherein the heating disc body is divided into a central part positioned in the central area and an edge part positioned at the periphery of the central part, and the power density of the central part is larger than that of the edge part, so that the heating disc body presents a distribution state that the temperature of the central part is higher than that of the edge part. The embodiment of the aspect provides a heating tube component with unevenly distributed power density, which realizes high power density inside and low power density outside in the diameter direction of a heating disc body, so that the heat radiation transfer effect is also high inside and low outside, and the problem of low temperature of a convection heat transfer center in a cooking cavity of cooking equipment in the related technology is solved.

In addition, the heating tube assembly provided in the above embodiment of the present utility model may further have the following additional technical features:

in some embodiments, the outer diameter of the central portion is D and the outer diameter of the edge portion is D, where d.ltoreq.2/3D. By the arrangement, the range of the central part and the range of the edge part are reasonable, and the effect of directional temperature compensation to the central area of the heating element assembly can be achieved, so that the temperatures at the center and the edge of the cooking cavity are better uniform.

In some embodiments, the heat-generating disk body comprises a tube body which is coiled in a plurality of circles along the radial direction of the heat-generating disk body from inside to outside or from outside to inside. The heating plate body is formed by winding the pipe body, and the heating plate body is simple in structure and easy to process and produce.

In some embodiments, the tube body includes an outer tube cover and a heating wire disposed in the outer tube cover, the heating wire in the edge portion has a number of turns per unit length of N1, and the heating wire in the center portion has a number of turns per unit length of N2, where N1 < N2.

In these embodiments, by controlling the process of winding the heating wire inside the tube body, the winding of the heating wire inside is divided into two sections, the number of turns density of the heating wire in the two sections is respectively N1 and N2, the number of turns N1 < N2 in the unit length in the axial direction, after bending the tube body, the tube body with the number of turns density of N1 forms the edge portion, the tube body with the number of turns density of N2 forms the central portion, and the difference of the power densities of the outer heating disc body is formed by the difference of the total lengths of the heating wires in the unit length of the tube body, so that the power density of the central portion is greater than the power density of the edge portion, and further the heating disc body is in a distribution state that the temperature of the central portion is higher than the temperature of the edge portion.

In some embodiments, the number of turns per unit length of the heater wire increases gradually from the inner ring to the outer ring of the tube. So set up for the power density of body is from inner circle to outer lane increase gradually, and then realizes that the dish disk body that generates heat presents the temperature distribution state that reduces gradually from interior to outer temperature for the temperature variation of the dish disk body that generates heat is more even, is favorable to realizing the even heating of cooking cavity different positions department more.

In some embodiments, the power density of the heater is less than 7.5W/cm ² . In the range, the heating wire is prevented from being fused due to overlarge power density of the heating wire in a dry heating state, and the quality of a product is improved.

In some embodiments, the spacing between adjacent turns of tubing in the rim portion is greater than the spacing between adjacent turns of tubing in the center portion.

In these embodiments, by setting the dimensional interval change between two adjacent rings of tubes in the multiple rings of tubes and changing the interval between two adjacent rings of tubes, the power of the unit area of the central area of the heating disc is greater than the power of the unit area of the peripheral area, so that the power density of the central area is greater than the power density of the edge area, and the heating disc is in a distribution state that the temperature of the central area is higher than the temperature of the edge area.

In some embodiments, in the multi-turn tube, the spacing between two adjacent turns of tube gradually increases from inside to outside along the radial direction of the heating plate. So set up for interval between two adjacent circles body is increased gradually from inner circle to outer lane, and then the realization dish disk body that generates heat presents the temperature distribution state that reduces gradually from interior to outer temperature, makes the temperature variation of dish disk body that generates heat more even, is favorable to realizing the even heating of cooking cavity different positions department more.

In some embodiments, the power P1 of the center portion and the power P2 of the edge portion satisfy:by this arrangement, the power density of the center portion is defined to be higher than that of the edge portion, so that it is possible to ensure that the heat generating disk body assumes a distributed state in which the temperature of the center portion is higher than that of the edge portion.

In some embodiments, the heating tube assembly further comprises: the first end of the extension section is connected with the end part of the pipe body positioned at the innermost ring and extends to the outer side of the heating disk body along the radial direction, the extension section is bent, and the second end of the extension section extends towards the axial direction of the heating disk body; the first connecting terminal is connected with the second end of the extension section; and the second connecting terminal is connected with the end part of the tube body positioned at the outermost ring, and the end part of the tube body positioned at the outermost ring is bent and extends towards the axial direction of the heating disc body.

In these embodiments, the tube body is coiled into a disc, the first end of the extension section is connected with the end of the tube body positioned at the innermost ring and extends to the outer side of the heating disc body along the radial direction, the extension section is bent, the second end of the extension section extends towards the axial direction of the heating disc body, the end of the tube body positioned at the outermost ring is bent and extends towards the axial direction of the heating disc body to form two convex tubes, and therefore the first connecting terminal and the second connecting terminal can be connected on the two convex tubes, the extending direction of the first connecting terminal and the second connecting terminal is changed, and the first connecting terminal and the second connecting terminal are conveniently connected with electric devices such as a circuit board of the cooking equipment.

According to a second aspect of the present utility model, there is provided a cooking apparatus comprising: a cooking cavity; and a heating tube assembly according to any one of the above technical solutions, the heating tube assembly being horizontally disposed in the cooking cavity.

The cooking device provided by the embodiment of the present utility model has the heating tube assembly provided by any one of the above technical solutions, and thus has the beneficial effects of any one of the above technical solutions, which is not described in detail herein.

In some embodiments, the heating tube assembly is disposed at a top of the cooking cavity, and the cooking apparatus further comprises: the fan blade is rotatably arranged in the cooking cavity, is a centrifugal fan blade and is arranged above the heating pipe assembly; and the baking tray is arranged at the bottom of the cooking cavity and is positioned below the heating tube assembly.

In these embodiments, the heating tube assembly is disposed at the top of the cooking cavity, the fan blades are disposed above the heating tube assembly, the fan blades rotate to drive the air around the heating tube assembly to flow, flow downwards from the inside to the outside of the cooking cavity, and then flow back from the bottom to the top to form a reflux at the center, so that a thermal convection is formed in the cooking cavity, the air in the cooking cavity is heated by the thermal convection, and a "low-temperature reflux area" is formed below the centrifugal fan blades by the thermal convection heating, which causes the problem of lower temperature at the place, so that the phenomena of burning around and clamping in the middle are easy to occur in the process of frying food. According to the cooking equipment provided by the embodiment of the utility model, the power density of the central part of the heating pipe assembly is higher than that of the edge part, so that the temperature of the central part is higher than that of the edge part, and further, temperature compensation is formed with heat convection, so that the temperature difference between the central position and the peripheral edge position of the cooking cavity is as close as possible, the effect of homogenizing the temperature in the cooking cavity is achieved, and better cooking effect can be realized.

Additional aspects and/or advantages of the present general inventive concept 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 general inventive concept.

Drawings

The above and other objects and features of the present utility model will become more apparent from the following description of embodiments of the present utility model taken in conjunction with the accompanying drawings in which:

FIG. 1 illustrates a schematic structural view of a heating tube assembly in accordance with an embodiment of the present utility model;

fig. 2 is a schematic cross-sectional structure view showing a heating tube assembly according to a first embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view showing a heat generating tube assembly according to a second embodiment of the present utility model;

FIG. 4 illustrates a side view of a heating tube assembly in accordance with an embodiment of the present utility model;

FIG. 5 illustrates another side view of a heating tube assembly of an embodiment of the present utility model;

fig. 6 is a schematic view showing a partial structure of a cooking apparatus according to an embodiment of the present utility model;

FIG. 7 shows a schematic view of heat convection and heat radiation action intensity distribution in a cooking cavity of a cooking apparatus according to an embodiment of the present utility model;

fig. 8 illustrates a schematic view of temperature distribution of a peripheral region and a central region in a cooking cavity of a related art cooking apparatus;

fig. 9 illustrates a schematic view of temperature distribution of a peripheral region and a central region in a cooking cavity of a cooking apparatus according to an embodiment of the present utility model.

Reference numerals illustrate:

10 heating tube assemblies, 110 heating disk bodies, 111 central portions, 112 edge portions,

120 pipe body, 121 outer pipe cover, 122 heating wire,

130 an extension of the length of the tube,

140, 150 second connection terminals,

20 cooking apparatus, 210 fan blade, 220 bracket, 230 temperature sensor, 240 heat shield.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and/or systems described herein will be apparent after an understanding of the present disclosure. For example, the order of operations described herein is merely an example and is not limited to those set forth herein, but may be altered as will be apparent after an understanding of the disclosure of the utility model, except for operations that must occur in a specific order. Furthermore, descriptions of features known in the art may be omitted for clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided to illustrate only some of the many possible ways to implement the methods, devices, and/or systems described herein that will be apparent after an understanding of the present disclosure.

As used herein, the term "and/or" includes any one of the listed items associated as well as any combination of any two or more.

Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, first component, first region, first layer, or first portion referred to in the examples described herein may also be referred to as a second member, second component, second region, second layer, or second portion without departing from the teachings of the examples.

In the description, when an element such as a layer, region or substrate is referred to as being "on" another element, "connected to" or "coupled to" the other element, it can be directly "on" the other element, be directly "connected to" or be "coupled to" the other element, or one or more other elements intervening elements may be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" or "directly coupled to" another element, there may be no other element intervening elements present.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Singular forms also are intended to include plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, amounts, operations, components, elements, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, amounts, operations, components, elements, and/or combinations thereof. The term "plurality" represents two and any number of two or more.

The definition of the azimuth words such as "upper", "lower", "top", and "bottom" in the present utility model is based on the azimuth definition of the product when the product is in normal use state and is placed upright.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. Unless explicitly so defined herein, terms such as those defined in a general dictionary should be construed to have meanings consistent with their meanings in the context of the relevant art and the present utility model and should not be interpreted idealized or overly formal.

In addition, in the description of the examples, when it is considered that detailed descriptions of well-known related structures or functions will cause ambiguous explanations of the present utility model, such detailed descriptions will be omitted.

The heating tube assembly 10 and the cooking apparatus 20 provided by the embodiment of the present utility model will be described with reference to fig. 1 to 9.

As shown in fig. 1, 2 and 3, an embodiment of a first aspect of the present utility model provides a heating tube assembly 10 for a cooking apparatus 20, the cooking apparatus 20 including a cooking cavity in which the heating tube assembly 10 is disposed, the heating tube assembly 10 including: heating disk body 110, heating disk body 110 includes central portion 111 and edge portion 112, and central portion 111 is located the central region of heating disk body 110, and edge portion 112 is located the periphery of central portion 111, and the power density of central portion 111 is greater than the power density of edge portion 112.

The heating tube assembly 10 provided in the embodiment of the present utility model includes the heating disc 110, where the heating disc 110 is divided into a central portion 111 located in the central area and an edge portion 112 located at the outer periphery of the central portion 111, and the power density of the central portion 111 is greater than that of the edge portion 112, so that the heating disc 110 presents a distribution state in which the temperature of the central portion 111 is higher than that of the edge portion 112. The embodiment of the present utility model provides a heating tube assembly 10 with unevenly distributed power density, which realizes that the power density is high inside and low outside in the diameter direction of the heating disc body 110, so that the heat radiation transfer effect is also high inside and low outside, thereby solving the problem of low temperature of the convection heat transfer center in the cooking cavity of the cooking apparatus 20 in the related art.

Further, in the case where the heating tube assembly 10 is disposed in the cooking cavity, the heating tube assembly 10 can heat the cooking cavity, and by making the heating plate body 110 exhibit a distribution state in which the temperature of the central portion 111 is higher than that of the edge portion 112, the heat radiation transfer effect is also internal and external low, and the central temperature formed by convection heat transfer in the cooking cavity is lower, and the peripheral temperature is higher to form temperature compensation, so that the temperature difference between the central position and the peripheral edge position of the cooking cavity is as close as possible, thereby playing a role in homogenizing the temperature in the cooking cavity, and achieving a better cooking effect.

As shown in fig. 2 and 3, a central area with a marked diameter D is a central portion 111, an area between the outer periphery of the central portion 111 and the marked diameter D is an edge portion 112, in the plane of the heating disc body 110, the power density of the central portion 111 is high, the power density of the edge portion 112 is low, so that the heat radiation effect in the cooking cavity is in a rule of decreasing from the center to the outside, as shown in fig. 7, the effect is opposite to the heat convection heat transfer temperature decreasing from the outside to the inside, and respective temperature gradient distribution characteristics of heat radiation and heat convection can form advantage complementation, thereby achieving the purpose of uniform temperature field in the whole cooking cavity.

It will be appreciated that the central portion 111 and the edge portion 112 are integrally formed together, and are herein divided into regions for the purpose of distinguishing between different positions.

It should be noted that the power density is a ratio of the heating power to the area, that is, the heating power of the heating tray 110 in a unit area.

In some embodiments, as shown in FIGS. 2 and 3, the outer diameter of the central portion 111 is D and the outer diameter of the edge portion 112 is D, where d.ltoreq.2/3D. By doing so, the extent of the center portion 111 and the extent of the edge portion 112 are made reasonable, and the effect of directional temperature compensation to the center region of the heat generating member assembly can be achieved, thereby better homogenizing the temperature at the center and at the edge of the cooking cavity.

In some embodiments, as shown in fig. 1, 2 and 3, the heat-generating plate 110 includes a tube 120, and the tube 120 is coiled in a plurality of turns along a radial direction of the heat-generating plate 110 from inside to outside or from outside to inside. By the arrangement, the heating plate body 110 is formed by winding the pipe body 120, and the heating plate body 110 is simple in structure and easy to process and produce.

In some embodiments, as an example, the first end of the tube body 120 is optionally gradually coiled in a plurality of turns clockwise or counterclockwise from inside to outside to form the heat-generating disc body 110.

The use of the tube body 120 coiled into the heating plate body 110 can reduce the production cost of the heating tube assembly 10 while realizing different temperatures at different positions of the heating plate body 110, and further reduce the production cost of the cooking device 20 with the heating tube assembly 10.

In some embodiments, as shown in fig. 2, the tube body 120 includes an outer tube cover 121 and heating wires 122 disposed in the outer tube cover 121, the number of turns per unit length of the heating wires 122 in the edge portion 112 is N1, and the number of turns per unit length of the heating wires 122 in the center portion 111 is N2, where N1 < N2.

In these embodiments, by controlling the process of winding the heating wire 122 inside the tube 120, the winding of the heating wire 122 is divided into two sections, the number of turns density of the heating wire 122 in the two sections is respectively N1 and N2, the number of turns N1 < N2 in the unit length in the axial direction, after the tube 120 is bent, the tube 120 with the number of turns density of N1 forms the edge portion 112, the tube 120 with the number of turns density of N2 forms the central portion 111, and the difference of the power densities of the outer heating disk body 110 is formed by the difference of the total lengths of the heating wires 122 in the unit length of the tube 120, so that the power density of the central portion 111 is greater than the power density of the edge portion 112, and further the heating disk body 110 is realized to present a distribution state that the temperature of the central portion 111 is higher than the temperature of the edge portion 112.

In some embodiments, as shown in fig. 2, the number of turns per unit length of the heating wire 122 increases gradually from the inner ring to the outer ring of the tube 120. So set up for the power density of body 120 is crescent from inner circle to outer lane, and then realizes that the dish disk body 110 that generates heat presents the temperature distribution state that reduces gradually from interior to outside temperature, makes the temperature variation of dish disk body 110 that generates heat more even, is favorable to realizing the even heating of cooking cavity different positions department more.

In some embodiments, the power density of the heater 122 is less than 7.5W/cm ² . Within this range, can avoidIn the dry-heating-free state, the heating wire 122 is fused due to the overlarge power density of the heating wire 122, so that the quality of a product is improved.

It should be noted that the power density of the heating wire 122 is a ratio of the power of the heating wire 122 to the relative area of the heating wire 122, that is, the power of the heating wire 122 in a unit area.

It is understood that the power density of the heating wire 122 of the center portion 111 is greater than the power density of the heating wire 122 of the edge portion 112.

In some embodiments, as shown in fig. 3, the spacing between adjacent turns of tube 120 in rim portion 112 is greater than the spacing between adjacent turns of tube 120 in central portion 111.

In these embodiments, by setting the dimensional interval between two adjacent rings of tubes 120 in the plurality of rings of tubes 120 to vary, the interval between two adjacent rings of tubes 120 is changed, so that the power of the unit area in the central area of the heating disc 110 is greater than the power of the unit area in the peripheral area, so that the power density of the central portion 111 is greater than the power density of the edge portion 112, and further, the heating disc 110 presents a distribution state in which the temperature of the central portion 111 is higher than the temperature of the edge portion 112.

Further, in some embodiments, the power density of the outer heating coil 110 may be varied by varying the total length of the heating wires 122 per unit length of the tube 120, such that the power density of the central portion 111 is greater than the power density of the edge portion 112; meanwhile, the size interval between two adjacent rings of the tube bodies 120 in the multi-ring tube bodies 120 is changed, so that the power density of the central part 111 is higher than that of the edge part 112, and the distribution state that the temperature of the central part 111 is higher than that of the edge part 112 of the heating disc body 110 is better realized.

In some embodiments, as shown in fig. 3, in the multi-turn tube 120, the interval between two adjacent turns of tube 120 gradually increases from inside to outside along the radial direction of the heat generating disc 110. So set up for interval between two adjacent circles body 120 is increased gradually from inner circle to outer lane, and then the realization dish disk body 110 that generates heat presents the temperature distribution state that reduces gradually from interior to outside temperature, makes the temperature variation of dish disk body 110 that generates heat more even, is favorable to realizing the even heating of cooking cavity different positions department more.

Specifically, the tube 120 is bent from outside to inside into a first ring, a second ring, a third ring, a fourth ring, and a fifth ring … …, where a1 is a distance between the first ring and the second ring, a2 is a distance between the second ring and the third ring, a3 is a distance between the third ring and the fourth ring, and a4 … … is a distance between the fourth ring and the fifth ring, and a1 > a2 > a3 > a4.

In some embodiments, the power P1 of the center portion 111 and the power P2 of the edge portion 112 satisfy: by this arrangement, the power density of the center portion 111 is defined to be greater than that of the edge portion 112, so that it is possible to ensure that the heat generating disk body 110 assumes a distributed state in which the temperature of the center portion 111 is higher than that of the edge portion 112.

In some embodiments, as shown in fig. 1, 2, 3, 4 and 5, the heat generating tube assembly 10 further comprises: an extension section 130, a first end of the extension section 130 is connected with an end of the tube body 120 positioned at the innermost ring and extends to the outer side of the heating disc body 110 along the radial direction, the extension section 130 is bent, and a second end of the extension section 130 extends towards the axial direction of the heating disc body 110; a first connection terminal 140 connected to the second end of the extension 130; the second connection terminal 150 is connected to an end of the tube body 120 located at the outermost ring, and the end of the tube body 120 located at the outermost ring is bent and extends toward the axial direction of the heat generating disc body 110.

In these embodiments, the tube body 120 is coiled into a disc, the first end of the extension 130 is connected with the end of the tube body 120 located at the innermost ring and extends to the outside of the heat generating disc body 110 in the radial direction, the extension 130 is bent and the second end of the extension 130 extends toward the axial direction of the heat generating disc body 110, the end of the tube body 120 located at the outermost ring is bent and extends toward the axial direction of the heat generating disc body 110 to form two protruding pipes, so that the first connection terminal 140 and the second connection terminal 150 can be connected on the two protruding pipes, and the extending direction of the first connection terminal 140 and the second connection terminal 150 is changed, thereby facilitating connection of the first connection terminal 140 and the second connection terminal 150 with electric devices such as a circuit board of the cooking apparatus 20.

Further, in practical application, the heating plate assembly may be assembled into the cooking cavity in an upward direction of the first connection terminal 140 and the second connection terminal 150, and the first connection terminal 140 and the second connection terminal 150 are connected to the machine head of the cooking apparatus 20, so as to be conveniently connected to an electrical device such as a circuit board.

As shown in fig. 6, according to a second aspect of the present utility model, there is provided a cooking apparatus 20 comprising: a cooking cavity; and the heat generating tube assembly 10 according to any one of the above-mentioned technical aspects, the heat generating tube assembly 10 being horizontally disposed in the cooking cavity.

The cooking apparatus 20 provided in this embodiment has the heating tube assembly 10 provided in any one of the above technical solutions, so that the cooking apparatus has the beneficial effects of any one of the above technical solutions, and is not described in detail herein.

In some embodiments, as shown in fig. 6, the heating tube assembly 10 is disposed at the top of the cooking cavity, and the cooking apparatus 20 further includes: the fan blade 210 is rotatably arranged in the cooking cavity, the fan blade 210 is a centrifugal fan blade 210, and the fan blade 210 is arranged above the heating tube assembly 10; and a bakeware arranged at the bottom of the cooking cavity and positioned below the heating tube assembly 10.

In these embodiments, the heating tube assembly 10 is disposed at the top of the cooking cavity, the fan blades 210 are disposed above the heating tube assembly 10, the fan blades 210 rotate to drive the air around the heating tube assembly 10 to flow downwards and outwards in the cooking cavity, and then flow back from bottom to top in the central position, so that heat convection is formed in the cooking cavity, the air in the cooking cavity is heated by the heat convection, and a "low-temperature backflow area" is formed below the centrifugal fan blades 210 by the heat convection heating, so that the problem of low temperature is caused, and the phenomena of burning all around and middle clamping occur easily in the process of frying food. In the cooking apparatus 20 provided by the embodiment of the utility model, since the power density of the central portion 111 of the heating tube assembly 10 is greater than that of the edge portion 112, the temperature of the central portion 111 is higher than that of the edge portion 112, and further temperature compensation is formed with thermal convection, so that the temperature difference between the central position and the peripheral edge position of the cooking cavity is as close as possible, the effect of homogenizing the temperature in the cooking cavity is achieved, and better cooking effect can be achieved.

Further, as shown in fig. 6, in some embodiments, the cooking apparatus 20 further includes a heat insulation plate 240, a support 220, and a temperature sensor 230, wherein the heat insulation plate 240 is disposed at the top of the cooking cavity, the heat generating tube assembly 10 is mounted to the heat insulation plate 240 through the support 220, the heat insulation plate 240 can play a role of blocking upward diffusion of heat, and abnormal parts such as a circuit board disposed at the top of the heat insulation plate 240 are prevented from being generated due to excessively high temperature; further, the temperature sensor 230 is disposed on the heat insulation board 240 and is used for detecting the temperature of the heat insulation board 240, so as to monitor the abnormal temperature in time, and improve the safety of the product.

The temperature difference of the cooking apparatus 20 provided by the embodiment of the present utility model compared to the peripheral area and the central area of the cooking apparatus 20 in the related art will be specifically described with reference to fig. 8 and 9, wherein fig. 8 shows a schematic diagram of the temperature distribution of the peripheral area and the central area in the cooking chamber of the cooking apparatus 20 in the related art; fig. 9 shows a schematic view of temperature distribution of a peripheral region and a central region in a cooking cavity of the cooking apparatus 20 according to an embodiment of the present utility model. Specifically, using 1400W power as an example, a 5L volume air fryer was used with a motor speed of 2200rpm. The power density of the heating tube assembly 10 of the conventional air fryer in the related art is uniformly distributed to 5.6W/cm ² The embodiment of the present utility model provides an air fryer having a center portion 111 with a power density of 7W/cm ² The power density of the edge portion 112 is 5W/cm ² The temperature field results are compared as follows: the temperature difference between the central area and the peripheral area of the common air fryer in the related art is about 20 ℃ on average; embodiments of the present utility model provide an air fryer employing a pair of unevenly distributed heating tube assemblies 10After the central temperature compensation, the temperature difference between the central area and the peripheral temperature is reduced by 5-10 ℃, and the uniformity of the temperature field is improved by more than 70%.

Although embodiments of the present utility model have been described in detail hereinabove, various modifications and variations may be made to the embodiments of the utility model by those skilled in the art without departing from the spirit and scope of the utility model. It will be appreciated that such modifications and variations will be apparent to those skilled in the art that they will fall within the spirit and scope of the embodiments of the utility model as defined in the appended claims.

Claims

1. A heat generating tube assembly for a cooking apparatus (20), the cooking apparatus (20) comprising a cooking cavity in which the heat generating tube assembly is disposed, characterized in that the heat generating tube assembly comprises:

the heating disc body (110), the heating disc body (110) comprises a central part (111) and an edge part (112), the central part (111) is located in the central area of the heating disc body (110), the edge part (112) is located in the periphery of the central part (111), and the power density of the central part (111) is greater than that of the edge part (112).

2. The heat pipe assembly of claim 1, wherein the heat pipe assembly comprises,

the outer diameter of the central part (111) is D, and the outer diameter of the edge part (112) is D, wherein D is less than or equal to 2/3D.

3. The heat pipe assembly of claim 1, wherein the heat pipe assembly comprises,

the heating disc body (110) comprises a tube body (120), and the tube body (120) is coiled into a plurality of circles along the radial direction of the heating disc body (110) from inside to outside or from outside to inside.

4. The heat pipe assembly of claim 3 wherein the heat pipe assembly comprises,

the pipe body (120) comprises an outer pipe cover (121) and heating wires (122) arranged in the outer pipe cover (121), the number of turns of the heating wires (122) in unit length in the edge portion (112) is N1, and the number of turns of the heating wires (122) in unit length in the center portion (111) is N2, wherein N1 is less than N2.

5. The heat pipe assembly of claim 4 wherein the heat pipe assembly comprises,

the number of turns of the heating wire (122) per unit length is gradually increased from the inner ring to the outer ring of the pipe body (120).

6. The heat pipe assembly of claim 4 wherein the heat pipe assembly comprises,

the power density of the heating wire (122) is less than 7.5W/cm ² 。

7. The heat pipe assembly of claim 3 wherein the heat pipe assembly comprises,

the spacing between two adjacent turns of the tube body (120) in the edge portion (112) is larger than the spacing between two adjacent turns of the tube body (120) in the central portion (111).

8. The heat pipe assembly of claim 3 wherein the heat pipe assembly comprises,

in the plurality of circles of the tube bodies (120), the space between two adjacent circles of the tube bodies (120) is gradually increased from inside to outside along the radial direction of the heating disc body (110).

9. The heat pipe assembly of claim 3 wherein the heat pipe assembly comprises,

the power P1 of the center portion (111) and the power P2 of the edge portion (112) satisfy:

10. the heat pipe assembly of claim 3, further comprising:

an extension section (130), wherein a first end of the extension section (130) is connected with an end of the tube body (120) positioned at the innermost ring and extends to the outer side of the heating disc body (110) along the radial direction, the extension section (130) is bent, and a second end of the extension section (130) extends towards the axial direction of the heating disc body (110);

a first connection terminal (140) connected to a second end of the extension section (130);

and a second connection terminal (150) connected to the end of the pipe body (120) located at the outermost ring, wherein the end of the pipe body (120) located at the outermost ring is bent and extends in the axial direction of the heat-generating disk body (110).

11. A cooking apparatus (20), characterized by comprising:

a cooking cavity; and

the heat generating tube assembly as recited in any one of claims 1 to 10, horizontally disposed in the cooking cavity.

12. The cooking apparatus (20) according to claim 11, wherein the heat generating tube assembly is disposed at a top of the cooking cavity, the cooking apparatus (20) further comprising:

the fan blade (210) is rotatably arranged in the cooking cavity, the fan blade (210) is a centrifugal fan blade (210), and the fan blade (210) is arranged above the heating tube assembly;

and the baking tray is arranged at the bottom of the cooking cavity and is positioned below the heating tube assembly.