Heating sheet, heating tube, and electrical appliance

Abstract

To provide a heating sheet that is highly resistant to impact and has excellent break-prevention performance.SOLUTION: The heating sheet includes a graphite sheet substrate 100. The graphite sheet substrate has a heating area 110 and a buffer area 120. The buffer area 120 is located at two ends of the graphite sheet substrate 100. The heating area 110 is connected to the buffer area 120 and is located on the side far from the edge of the buffer area 120. The heating area 110 has a hollowed-out area. The duty ratio of the buffer area 120 is greater than the duty ratio of the heating area 110.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present application relates to the technical field of electrical appliances, and more particularly to a heating sheet, a heating tube and an electrical appliance. [Background technology]

[0002] Heating tubes are the core components of kitchen electrical appliances for baking, such as electric ovens, and their heating efficiency, response speed, inrush current, etc. are important indicators for measuring performance. Existing heating tubes have problems such as slow heat conduction of the heating material and low energy utilization rate in heating mode, resulting in problems such as heat dispersion and slow response speed.

[0003] For this reason, conventional heating sheets, heating tubes and electrical appliances still need to be improved. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application was made based on the inventor's discovery of the following problems. In a heating tube with a linear heating mode, the radiation heat transfer is directed toward the radial periphery of the heating tube, which causes the heat to be dispersed and reduces the energy utilization rate. In addition, a typical heating tube takes several tens of seconds or more from the start of current flow until the surface is heated to the highest temperature, resulting in a slow response speed, changes in the resistivity of the heating wire as the temperature rises, and a large inrush current occurs during this process. Inventor According to them, graphite heating tubes have high heating efficiency, fast response speed, and small inrush current. However, the graphite sheet is very brittle and cannot be easily damaged by mechanical shock. In conventional electric ovens, the graphite sheet is easily broken when exposed to heat. During assembly, there is rigid contact between the heating tube and the wall of the electric oven. During the fall, the heating tube is subjected to stress transmitted from the wall of the electric oven, and the heating sheet in the light-emitting tube is will break.

[0005] The present application aims to alleviate or at least partially alleviate at least one of the above-mentioned problems. is intended to solve. [Means for solving the problem]

[0006] In one aspect of the present application, the present application provides a heat generating sheet, the heat generating sheet being made of a graphite material. The graphite sheet substrate has a heat generating region and a buffer region, The buffer regions are located at two ends of the graphite sheet substrate, and the heat generating regions are The heat generating region is hollowed out and is connected to the impact region and is located on the side of the buffer region far from the end portion. The buffer region has a duty ratio greater than that of the heating region. This provides the heat generating sheet with the advantages of excellent impact resistance and high breakage prevention performance.

[0007] In this application, the "duty ratio" refers to a certain region (e.g., a buffer region, a heat generation region). In the graphite sheet substrate, the area occupied by the portion having the graphite sheet substrate and the graphite in the portion are Ratio to the total area of ​​the graphite sheet substrate (the sum of the areas including the graphite portion and the hollowed-out portion) In other words, the more the cutout portion is, the smaller the duty ratio is. In the region, the total area of ​​the graphite sheet substrate extends along the second direction in the region. It may also be the area of ​​the region surrounded by the connecting wires on the edge of the stretched graphite sheet substrate.

[0008] Further, the length of the buffer region along the extending direction of the graphite sheet substrate is 5-60mm.

[0009] Further, the buffer region includes at least one of a first buffer region and a second buffer region. a duty ratio of the first buffer area is 1 and a duty ratio of the second buffer area is The duty ratio of the second buffer region is smaller than the duty ratio of the heating region. Greater than.

[0010] The second buffer region further includes a plurality of cutouts, the cutouts being disposed in the grapher. The notch extends from the edge side of the graphite sheet substrate to the center of the graphite sheet substrate. The direction in which the graphite sheet extends is perpendicular to the direction in which the graphite sheet substrate extends. The notch is formed by cutting the graphite sheet substrate from the outer surface side of the graphite sheet substrate. Extends toward the center of the body.

[0011] Furthermore, the heat generating region includes a plurality of heat generating units, and the heat generating units are connected in sequence from front to back. The said Parts 1 and 3 are the same as those in the preceding paragraphs. The first portion extends along a first direction, the second portion and the fourth portion extend along a second direction, and the The first direction and the second direction intersect, and the second direction is the graphite sheet substrate. is the stretching direction, and the first direction and the second direction are perpendicular to each other.

[0012] Further, the maximum dimension of the first portion and the second portion in the first direction is The maximum depth of the notches is greater than the maximum depth of the notches, and at least one of the intervals between the notches is the maximum dimension of the third portion and the fourth portion in the second direction, and The gap is between two adjacent cutouts located on the same side of the cutouts. is the distance between the notches.

[0013] The depth of the notch is the depth of the notch in a first direction. The maximum dimension of the portion in the first direction is greater than the maximum depth of the plurality of notches. In the thermal region, the dimension of the first portion in the first direction and the dimension of the second portion in the first direction The maximum value of the dimensions of the plurality of cutouts in the second buffer region in the first direction is It means it is greater than the maximum depth.

[0014] The intervals between the notches are set so that the notches are arranged at the same positions on the graphite sheet substrate among the plurality of notches. The distance between two adjacent notches located on the side surface.

[0015] Similarly, the second buffer region has a plurality of notches, and the same The distance between two adjacent notches located on one side surface is the same. At least one of the intervals between the notches may be different from the third portion. The fourth portion is larger than the maximum dimension in the second direction. The distance between the notches is set to a dimension of the third portion in the second direction and a dimension of the fourth portion in the second direction. This means that the dimension is larger than the maximum dimension in the direction of the arrow.

[0016] According to an embodiment of the present invention, the maximum dimension in the first direction of the first portion and the third portion is The depth of the notch is greater than the maximum depth of the notches. At least one of the second and fourth portions is greater than the maximum dimension in the second direction of the second portion and the fourth portion. The intervals between the notches are such that the notches are located on the same side of the edge of the plurality of notches. is the distance between two adjacently located notches.

[0017] The maximum dimensions of the first portion and the third portion in the first direction are The term "larger than the maximum depth of the first portion" means that the dimension of the first portion in the first direction and the dimension of the third portion in the second direction are larger than the maximum depth of the first portion. The maximum value of the dimensions in the first direction is the depth of the plurality of cutouts in the first direction. This means that the maximum length is greater than the maximum value.

[0018] At least one of the intervals between the notches is The distance between at least one of the notches is greater than the maximum dimension in the two directions. a maximum value of a dimension of the second portion in the second direction and a dimension of the fourth portion in the second direction means greater than.

[0019] The heating area includes a plurality of heating units, each of which is divided into a first part, a second part, a third part, a fourth part, a fifth part, a sixth ... The heating unit includes a third part and a fourth part, and each heating unit has a groove formed therein. As can be seen, the maximum depth of the grooves in the first direction among the multiple heating units is The depth of the plurality of notches in the second buffer region is greater than the maximum depth in the first direction.

[0020] Further, the first buffer region and the second buffer region are disposed along the extending direction of the graphite sheet substrate. and the length of the first buffer region is independently 5-30 mm.

[0021] Furthermore, the length of the second buffer area is smaller than the length of the first buffer area.

[0022] Furthermore, the heat generating sheet has two buffer regions at both ends of the graphite sheet substrate. each of the first buffer region and the second buffer region; The two buffer regions at both ends of the graphite sheet substrate each have one of the first buffer regions. The graphite sheet substrate includes a shock absorber and a second shock absorber. One of the two end buffer regions is the first buffer region, and the other is 1. The first buffer region is made up of one of the second buffer regions. According to some embodiments of the present application, along the direction in which the graphite sheet substrate extends, The graphite sheet substrate is provided with the second buffer region, the first buffer region, and the second buffer region. The heating region includes the first buffer region and the second buffer region.

[0023] In another aspect of the present application, the present application provides a heating tube, the heating tube comprising the heating sheet The heating sheet is disposed in the outer tube, and the heating sheet is disposed in the outer tube. The heat sheet is connected to the connection terminal by the lead wire. It has all the features and advantages of the heating sheet described above, which will not be repeated here. The heating tube has the advantages of a fast response speed, high heating efficiency, and small inrush current.

[0024] In another aspect of the present application, the present application provides an electrical appliance, the electrical appliance comprising the heating tube. Thus, the appliance has all the features and advantages of the heating tube, but: I won't repeat the explanation here. Overall, the appliance has good heating performance and good impact resistance. It has the advantages of being

[0025] Furthermore, the electrical appliances include electric ovens, microwave ovens, or steam oven ranges. nothing. [Brief description of the drawings]

[0026] The above and / or additional aspects and advantages of the present invention are described in detail below with reference to the following detailed description of the preferred embodiments taken in conjunction with the drawings, in which: It is clear and easily understood. [Figure 1] 1 is a schematic diagram showing the structure of a heating sheet according to one embodiment of the present application. [Diagram 2] FIG. 2 is a schematic diagram showing the assembly relationship of a heating tube according to one embodiment of the present application. [Diagram 3] FIG. 2 is a schematic diagram of a heating tube receiving force according to one embodiment of the present application. [Figure 4] FIG. 2 is a schematic diagram of the internal force of a heating tube according to one embodiment of the present application. [Diagram 5] FIG. 2 is a structural schematic diagram of a heating unit according to one embodiment of the present application. [Figure 6] FIG. 2 is a structural schematic diagram of a heating sheet according to another embodiment of the present application. [Figure 7] FIG. 2 is a structural schematic diagram of a heating sheet according to another embodiment of the present application. [Figure 8] FIG. 2 is a structural schematic diagram of a heating tube according to one embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] In the following, embodiments of the present application will be described in detail, examples of which are illustrated in the drawings. Consistently use the same or similar symbols to indicate the same or similar parts or the same or similar functions. The embodiments described below with reference to the drawings are illustrative only and are not intended to be limiting of the present invention. These are merely intended to interpret the present application and should not be construed as limiting the present application. stomach.

[0028] In one embodiment of the present application, the present application provides a heat generating sheet, the heat generating sheet being made of graphite. Referring to FIG. 1, the graphite sheet substrate 100 includes a heat generating region 110 and The buffer region 120 is disposed at two ends of the graphite sheet substrate 100. The two ends are located on opposite sides of the graphite sheet substrate 100 (see FIG. 1). (Only one end is shown) the heating region 110 is connected to the buffer region 120. 0, the heating area 110 has a hollowed-out area, and the buffer area 120 The duty ratio is greater than that of the heat generating region 110. The heat generating sheet is very brittle and easily breaks when subjected to an external impact. By doing so, the impact of external force on the heating sheet is mitigated, and the heating sheet is also protected from external force. This contributes to effectively avoiding the malfunction phenomenon of breakage due to impact.

[0029] In this application, the "duty ratio" refers to the ratio of the The area occupied by the portion having the graphite sheet substrate and the graphite in that portion are Ratio to the total area of ​​the graphite sheet substrate (the sum of the areas including the graphite portion and the hollowed-out portion) In other words, the more the cutout portion is, the smaller the duty ratio is. In the region, the total area of ​​the graphite sheet substrate is It may also be the area of ​​the region surrounded by the connecting wires on the edge of the extending graphite sheet substrate.

[0030] For ease of understanding, the following will explain the factors that enable the heat generating sheet to exhibit the above-mentioned beneficial effects. The theory will be briefly explained.

[0031] Taking an electric oven equipped with a heating tube as an example, referring to FIG. During the assembly process, the connection between the heating tube 1000 and the wall of the electric oven The contact is a rigid body contact, that is, the assembly relationship between the heating tube 1000 and the wall of the electric oven is 1 The structure can be simplified to one fixed beam. During the drop of the electric oven, the heating tube is subjected to a load transmitted from the wall of the electric oven. It is assumed that the heat is distributed uniformly on the heating tube, and therefore, at any point on the heating tube, e.g. The force received at a length x from the end is Fs=ql / 2-qx, where q is the load transmitted from the wall of the electric oven that the heating tube receives during the drop of the electric oven, and l is the total length of the heating tube. Referring to FIG. 4, the force received at both ends of the heating tube during the drop is ql / 2, and at the center of the heating tube, that is, when the distance x from both ends of the heating tube is l / 2, the force received at the drop of the heating tube is 0. Referring to FIG. 5, the heating efficiency of the heating sheet is improved because a press process is required to form a folded heating unit 10 on the heating sheet inside the heating tube. That is, the local area of ​​the heating sheet is narrow, and the partial area has a small force receiving area, such as the second part 12 and the fourth part 14, so that the area is subjected to a large cutting stress. As can be seen from the above internal force example diagram, the heating tube receives a large cutting stress at both ends, so that the limit cutting stress of the heating sheet material is easily reached. This causes the heating sheet to break. This application proposes a heating sheet with a cushioning structure, and by installing cushioning structures with large local areas on both ends of the heating sheet, the cutting stress received by the end structure of the heating sheet is reduced, the impact resistance of the heating sheet is improved, and the defective phenomenon of a decrease in the heating performance of the heating tube due to the breakage of the heating sheet inside the heating tube during the dropping process is avoided.

[0032] In the present application, since the heat generating region has a hollow structure, the graphite in the region It will be understood by those skilled in the art that a portion of the structure is hollowed out and occupied by a "blank."

[0033] According to some embodiments of the present application, the buffer region improves the impact resistance and breakage resistance of the heat generating sheet. The length of the buffer region is not particularly limited. For example, The length of the buffer zone may range from 5-60mm along the direction of body extension. If the length of the buffer area is less than 5mm, the length of the buffer area will be too short and the impact resistance of the heating sheet will be reduced. If the length of the buffer area is greater than 60 mm, the buffer area cannot be effectively improved. The duty ratio of the area is high, and the graphite sheet substrate exists in a wide continuous area. If the length of the buffer area is too long, the heat generation performance of the entire heating sheet will be poor. The performance is poor and cannot meet the daily use requirements of the heating tube.

[0034] According to some embodiments of the present application, referring to FIG. 1, the larger the duty ratio of the buffer region, the For example, the duty ratio of the buffer area 120 may be 1. That is, the graphite sheet substrate in the region is not subjected to any pressing process, and the hollowed-out region This provides good impact resistance to the graphite sheet substrate in that region, and prevents the substrate from falling. This helps reduce damage to the heating sheet.

[0035] According to some embodiments of the present application, the structure of the buffer area of ​​the heating sheet is not particularly limited, and the buffer area The region may include at least one of a first buffer region and a second buffer region. 7, the duty ratio of the first buffer area 121 is 1, and the duty ratio of the second buffer area The duty ratio of the first buffer region 122 is smaller than 1, and the duty ratio of the second buffer region 122 is This is larger than the duty ratio of the region 110. The second buffer region 122 has no gap and can better buffer stress. Since the heat generating region 110 has a hollowed-out structure, it plays a role in absorbing stress in the heat generating region 110. It has a good heating effect and can effectively improve the heating performance of the heating tube.

[0036] According to some embodiments of the present application, the first buffer area 121 and the second buffer area 122 are The distribution in the graphite sheet substrate 100 is not particularly limited. For example, Are both of the two buffer regions 120 at both ends of the body 100 composed of the first buffer region 121? Alternatively, both may be formed of the second buffer region 122. That is, the graphite sheet substrate Can the two buffer regions 120 at both ends of the body 100 be the first buffer regions 121 at the same time? Or, at the same time, it is the second buffer region 122. For example, both ends of the graphite sheet substrate 100 One of the two buffer regions 120 may be configured as a first buffer region 121. , and the other may be composed of one second buffer area 122.

[0037] According to some embodiments of the present application, referring to FIG. 6, the buffer area 120 is a second buffer area 1 The buffer area 120 may further include only a first buffer area 121 (not shown). may also include.

[0038] According to some embodiments of the present application, referring to FIG. 7, the buffer area 120 is a first buffer area 1 The buffer area 120 may include the first buffer area 21 and the second buffer area 122 at the same time. When the first buffer region 121 and the second buffer region 122 are included at the same time, The impact area 122 may be disposed at only one end of the heat generating area 110, and the first buffer area 121 and The first and second buffer regions 122 may be installed simultaneously on both ends of the heat generating region 110. At one end of the thermal region 110, a first buffer region 121 is provided, and a second buffer region 122 is provided, or the second buffer area 122 is provided first, and then the first buffer area When the heating area 110 is installed, the first buffer area 121 and / or the second buffer area 122 are provided at the other end of the heating area 110. The present invention may be applied to the buffer area 122 at the other end. The structure of the heating region 110 is not limited as long as it has a buffer function. Only the first buffer area 121 or only the second buffer area 122 may be provided. The impact area 121 and the second buffer area 122 may be installed at the same time. The installation order of the first buffer area 21 and the second buffer area 122 is not particularly limited. You can choose accordingly.

[0039] According to some embodiments of the present application, the second buffer region 122 has a plurality of notches. The notch is formed by cutting the graphite sheet from the edge side of the graphite sheet substrate 100. The direction in which the notch extends is the same as the direction in which the notch extends to the center of the graphite sheet substrate 100. When the second buffer region 122 has the above structure, the second buffer The local area of ​​region 122 is larger than that of heat generation region 110, providing better cushioning and Since the buffer area 122 has a folded structure, it has better heat generation performance.

[0040] The heating area 110 includes a plurality of heating units 10. The heating units 10 may be arranged in series. Although parallel connection is also possible, the following description will be given taking a series connection as an example.

[0041] According to some embodiments of the present application, referring to FIG. 5, the structure of the heating unit 10 is not particularly limited. For example, the heating unit 10 is made up of a first section 11 and a second section 12 which are connected in series. 2, a third portion 13 and a fourth portion 14, the first portion 11 and the third portion 13 being oriented in a first direction. 1, the second portion 12 and the fourth portion 14 extend along a second direction, and the second portion 12 and the fourth portion 14 extend along a first direction. The first direction intersects with the second direction, and the second direction is the direction in which the graphite sheet substrate 100 extends. The first direction is perpendicular to the second direction. This is advantageous for the heat generation and heat dissipation of the heat generating sheet, and the heating performance of the heat generating sheet is good.

[0042] According to some embodiments of the present application, the first part 11, the second part 12, the third part 13 and the fourth part 14 The dimensions of the first portion 11 and the second portion 12 are not particularly limited, and for example, the maximum dimensions in the first direction of the first portion 11 and the second portion 12 are may be greater than the maximum depth of the notches. The other is larger than the maximum dimension in the second direction of the third portion 13 and the fourth portion 14. The intervals between the notches are located on the same side of the edge of the notches and are adjacent to each other. The distance between the two notches is the distance between the two notches.

[0043] According to an embodiment of the present application, the maximum dimension of the first portion 11 and the second portion 12 in the first direction is This is the maximum value of the dimension of the first portion 11 in the first direction and the dimension of the second portion 12 in the first direction.

[0044] The maximum dimension of the third portion 13 and the fourth portion 14 in the second direction is the maximum dimension of the third portion 13 in the second direction. and the maximum dimension of the fourth portion 14 in the second direction.

[0045] According to some embodiments of the present application, referring to FIG. 7, the depths of the notches are consistent. If the depths of multiple notches are not the same, Part 1 11 The maximum dimension h2 of the third portion 13 in the first direction is greater than the maximum depth h1 of the plurality of notches. The duty ratio of the buffer area must be greater than that of the heating area. can be secured.

[0046] The maximum dimension of the first portion 11 and the third portion 13 in the first direction is the maximum dimension of the first portion 11 in the first direction. and the maximum dimension of the third portion 13 in the first direction.

[0047] Similarly, referring to FIG. 7, multiple graphite sheets 100 located on the same side of the surface of the graphite sheet substrate 100 Of the notches, the spacing between adjacent notches may or may not match. Alternatively, in the second direction, the length of the second portion 12 may match the length of the fourth portion 14, The length of the fourth portion 14 does not have to match. When the spacing between adjacent notches does not match The length t2 of the second portion 12 and the fourth portion 14 in the second direction is longer than the interval t1 between the notches. It is okay if the duty ratio of the buffer area is smaller than that of the heating area. It is possible to ensure that:

[0048] According to some embodiments of the present application, the first buffer regions 121 are provided only on both ends of the heating region 110. When installed, the length of the first buffer region 121 is not particularly limited, and can be, for example, a graphite The length range of the first buffer region 121 is 5-60 mm along the stretching direction of the sheet substrate 100. When the length of the first buffer region 121 is within the above length range, The impact area 120 may exhibit excellent impact resistance and may also reduce heat generation due to the installation of the buffer area 120. The effect on the heat generation performance of the port may be reduced.

[0049] According to some embodiments of the present application, the second buffer regions 122 are provided only on both ends of the heating region 110. When installed, the length of the second buffer region 122 is not particularly limited, and can be, for example, a graphite The length range of the second buffer region 122 is 5-60 mm along the stretching direction of the sheet substrate 100. When the length of the second buffer region 122 is within the above length range, The impact area 120 may exhibit excellent impact resistance and may also reduce heat generation due to the installation of the buffer area 120. The effect on the heat generation performance of the port may be reduced.

[0050] According to some embodiments of the present application, the heating area 110 is provided at both ends with a first buffer area 121 and When the second buffer area 122 is installed at the same time, the first buffer area 121 and the second buffer area The length of the region 122 is not particularly limited. For example, the length of the region 122 may be determined in accordance with the direction in which the graphite sheet substrate 100 extends. The length ranges of the first buffer region 121 and the second buffer region 122 are independent of each other along the direction. Specifically, the length of the first buffer region 121 may be 20 mm. The length of the second buffer region 122 may be 15 nm. When the length of the first buffer region 21 and the length of the second buffer region 122 are within the above length range, the buffer region The buffer region 120 may exhibit excellent impact resistance, and the heating sheet may be The impact on heat generation performance may be reduced.

[0051] According to some embodiments of the present application, the length of the first buffer region 121 and the length of the second buffer region 122 For example, the length of the second buffer region 122 is It may be shorter than the length of the buffer region 121. This improves the impact resistance of the heat generating sheet. can be improved to.

[0052] In another embodiment of the present application, referring to FIG. 8, the present application provides a heating tube 1000, 1000 includes the above-mentioned heat generating sheet, an outer tube 200, a lead wire 300, and a connection terminal 400. The heat generating sheet is placed on the outer tube 200, and the heat generating sheet is connected to the connection terminal 40 by the lead wire 300. 0. This allows the heating tube to have all the features and advantages of the heating sheet. Generally speaking, the heating tube has a fast response speed and high heating efficiency. It has the advantages of being short and having a small inrush current.

[0053] In another aspect of the present application, the present application provides an electrical appliance, the electrical appliance comprising the heating tube described above. The appliance thereby has all the features and advantages of the heating tube described above, which are hereby repeated. In general, the electrical appliance has good heating performance, good impact resistance, etc. There are advantages.

[0054] According to some embodiments of the present application, the type of the electrical appliance is not particularly limited, for example, may be an electric oven, a microwave oven or a steam oven range.

[0055] In the description of this application, the orientation or positional relationship indicated by terms such as "upper" and "lower" is as shown in the drawings. The orientation or positional relationship is used only to facilitate or simplify the description of the present application. The present application does not require that the device be constructed and operated in any particular orientation, and therefore no limitations on the present application are imposed. should not be considered.

[0056] In the description of this application, when a term such as "in one embodiment" or "in another embodiment" is used, The specific features, structures, materials, or advantages described using the examples are incorporated herein by reference in at least one of the following claims. As used herein, the terms "substitute" and "substitutes" are intended to be included in the embodiments. Exemplary phrases used in different sections do not necessarily refer to the same embodiment or example. The specific features, structures, materials, or advantages described may be used in any one or more embodiments or examples. In addition, the present invention can be combined in an appropriate manner by those skilled in the art, provided that no inconsistencies arise between the two. Features of the same or different embodiments or examples described herein may be combined. In this specification, the terms "first" and "second" are used for explanatory purposes only. and indicates or suggests, or is indicated by, their relative importance. It should not be understood as implicitly indicating the quantities of technical features.

[0057] Although embodiments of the present application have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limiting the present application, and that those skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application. [Explanation of symbols]

[0058] 100: graphite sheet base, 110: heat generating region, 120: buffer region, 121: first buffer region, 122: second buffer region, 10: heat generating unit, 11: first part, 12: second part, 13: third part, 14: fourth part, 200: outer tube, 300: lead wire, 400: connecting terminal, 1000: heat generating tube.

Claims

1. A heat generating sheet, 1. A heating sheet comprising a graphite sheet base having a heating region and a buffer region, the buffer region being located at two ends of the graphite sheet base, the heating region being connected to the buffer region and located on a side farther from the ends of the buffer region, the heating region having a hollowed-out region, and a duty ratio of the buffer region being greater than a duty ratio of the heating region.

2. 2. The heat generating sheet according to claim 1, wherein the length of the buffer region is 5-60 mm along the direction in which the graphite sheet substrate extends.

3. the buffer region includes at least one of a first buffer region and a second buffer region; The duty ratio of the first buffer region is 1; 3. The heating sheet according to claim 2, wherein a duty ratio of the second buffer area is greater than a duty ratio of the heating area.

4. 4. The heating sheet according to claim 3, characterized in that the second buffer region has a plurality of cutouts extending from a peripheral side of the graphite sheet base to a center of the graphite sheet base, and the direction in which the cutouts extend is perpendicular to the direction in which the graphite sheet base extends.

5. 5. The heating sheet of claim 4, wherein the heat generating region includes a plurality of heat generating units, the heat generating units include a first part, a second part, a third part, and a fourth part that are connected in order from front to back, the first part and the third part extend along a first direction, the second part and the fourth part extend along a second direction, the first direction and the second direction intersect, the second direction is a direction in which the graphite sheet base extends, and the first direction and the second direction are perpendicular to each other.

6. a maximum dimension of the first portion and the second portion in the first direction is greater than a maximum depth of the plurality of notches; The heating sheet of claim 5, characterized in that at least one of the spacings between the notches is greater than the maximum dimension in the second direction of the third and fourth portions, and the spacing between the notches is the distance between two of the plurality of notches that are located on the same side edge and are adjacent to each other.

7. a maximum dimension of the first portion and the third portion in the first direction is greater than a maximum depth of the plurality of notches; The heating sheet of claim 5, characterized in that at least one of the spacings between the notches is greater than the maximum dimension in the second direction of the second and fourth portions, and the spacing between the notches is the distance between two of the plurality of notches that are located on the same side edge and are adjacent to each other.

8. 4. The heating sheet according to claim 3, wherein the length of the first buffer region and the length of the second buffer region are independently 5-30 mm along the extending direction of the graphite sheet substrate.

9. 9. The heating sheet according to claim 8, wherein the length of the second buffer area is smaller than the length of the first buffer area.

10. The heat generating sheet according to claim 3, wherein the two buffer regions at both ends of the graphite sheet substrate are both constituted by the first buffer region, or both constituted by the second buffer region.

11. 4. The heat generating sheet according to claim 3, wherein each of the two buffer regions at both ends of the graphite sheet substrate includes one of the first buffer region and one of the second buffer region.

12. The heat generating sheet according to claim 3, characterized in that one of the two buffer regions at both ends of the graphite sheet substrate is composed of one of the first buffer regions, and the other is composed of one of the second buffer regions.

13. A heating tube, A heat generating device comprising the heat generating sheet according to any one of claims 1 to 12, an outer tube, a lead wire, and a connection terminal, The heat generating sheet is installed on the outer tube, A heating tube, characterized in that the heating sheet is connected to the connection terminal via the lead wire.

14. An electrical appliance comprising the heating tube according to claim 13.

15. 15. The appliance of claim 14, wherein the appliance comprises an electric oven, a microwave oven or a steam oven range.

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