CN217284768U

CN217284768U - Heating body

Info

Publication number: CN217284768U
Application number: CN202220051930.XU
Authority: CN
Inventors: 张海波; 翟公高; 邹志安
Original assignee: Shenzhen Cilicon Technology Co ltd
Current assignee: Shenzhen Cilicon Technology Co ltd
Priority date: 2022-01-10
Filing date: 2022-01-10
Publication date: 2022-08-26
Anticipated expiration: 2032-01-10

Abstract

The utility model relates to a heat-generating body, heat-generating body are the dull and stereotyped sheet structure that the sheetmetal formed through the etching, including the portion that generates heat, extend the connecting portion that forms along the portion both ends that generate heat and extend the conductive part that forms to keeping away from the portion direction that generates heat by connecting portion, the cross-sectional area of connecting portion is by being close to the one end crescent extension of the portion that generates heat connection to the one end that is close to the conductive part, and the maximum cross-sectional area of connecting portion is less than the cross-sectional area of conductive part, and the minimum cross-sectional area of connecting portion is greater than the cross-sectional area of the section that generates heat in the portion that generates heat. The utility model discloses a injecing the gradual change structure of connecting portion cross-sectional area, when guaranteeing that connecting portion have enough support intensity to the portion that generates heat for the heat-generating body is when the circular telegram generates heat, and because connecting portion are less for the end that is connected with the portion that generates heat, the heat that has consequently reduced the portion that generates heat is to the conduction of electric conduction portion direction, and the heat that makes the production concentrates on the portion region that generates heat, makes atomization effect better, and has improved heat utilization efficiency.

Description

Heating body

Technical Field

The utility model belongs to the technical field of the electronic atomization, especially, relate to a heat-generating body.

Background

The heating net that present electronic atomizer adopted usually sets up electrically conductive region at the regional both ends of generating heat in the middle part, and two electrically conductive regions are connected with the electrode electricity respectively, because the area of connection of the regional and the electrically conductive region in both ends that generate heat of current heating net is too big, and the produced heat in the region that generates heat is too much to the electrically conductive region conduction, leads to actually generating heat the efficiency relatively poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve not enough among the prior art to a certain extent at least, provide a heat-generating body.

In order to realize the above object, the utility model provides a heat-generating body, the heat-generating body is the dull and stereotyped lamellar structure that the sheetmetal formed through the etching, including the portion of generating heat, follow the portion both ends of generating heat extend the connecting portion that forms and by connecting portion are to keeping away from the portion direction of generating heat extends the conductive part that forms, the cross-sectional area of connecting portion is by being close to the one end that the portion of generating heat connects is to being close to the one end crescent extension of conductive part, just the maximum cross-sectional area of connecting portion is less than the cross-sectional area of conductive part, the minimum cross-sectional area of connecting portion is greater than the cross-sectional area of the section of generating heat in the portion of generating heat.

Optionally, the conductive portion is circular, and two opposite side edges of the connecting portion in the width direction are tangent to the conductive portion respectively.

Optionally, at least one hollow hole is formed in the connecting portion.

Optionally, the thickness of the heat-generating body is 0.05 to 0.2 mm.

Optionally, the two conductive parts are located at two ends of the heating body along the transverse direction, and the heating part is in a grid shape, a stripe shape, an S shape, a zigzag shape, a wave shape, a zigzag shape, a spiral shape, a circular shape or a rectangular shape.

Optionally, the heat generating portion is connected with at least one fixing portion at two longitudinal sides.

Optionally, the heating portion is an S-shaped or continuous S-shaped bent heating wire, and includes a plurality of first heating sections, the first heating sections are arranged at intervals along the transverse direction and extend along the longitudinal direction, one end of each of two adjacent first heating sections is connected together through a second heating section, the other end is separated from each other, and two free ends of the heating portion are connected to the two connecting portions respectively; the first heating section and the second heating section have the same cross-sectional area and are smaller than the minimum cross-sectional area of the connecting part.

Optionally, the heating portion is an S-shaped or continuous S-shaped bent heating wire, and includes a plurality of first heating sections, the first heating sections are longitudinally spaced and extend substantially in a transverse direction, one end of each of two adjacent first heating sections is connected together through a second heating section, the other end is spaced, and two free ends of the heating portion are respectively connected to the two connecting portions; the first heating section and the second heating section have the same cross-sectional area and are smaller than the minimum cross-sectional area of the connecting part.

Optionally, the heating portion includes a plurality of rectangular heating wires, and the plurality of heating wires are arranged at intervals along the transverse direction and are sequentially connected in series between the two connecting portions; each heating wire comprises two first heating sections which extend along the longitudinal direction and are opposite in parallel, and two ends of each first heating section are correspondingly connected through a second heating section; the first heating section and the second heating section have the same cross-sectional area and are smaller than the minimum cross-sectional area of the connecting part.

Optionally, one fixing portion is connected to each of the second heat generating segments.

Optionally, the fixation portion extends in a longitudinal direction.

Alternatively, a part of the fixing portion may extend obliquely along one end close to the heat generating body, and another part of the fixing portion may extend obliquely along the other end close to the heat generating body.

Optionally, the second heating section is arc-shaped with a middle part protruding outwards.

Optionally, a connection part of the connection part and the first heat-generating section is further extended to form one fixing part.

Optionally, the heating portion includes a plurality of diamond-shaped heating wires, and the plurality of heating wires are sequentially connected in series between the two connecting portions along the transverse direction; the cross-sectional area of the heating wire is smaller than the minimum cross-sectional area of the connecting part.

Optionally, the short axis direction of the plurality of heating wires is arranged along the transverse direction, the long axis direction is arranged along the longitudinal direction, and two ends of each heating wire in the long axis direction are respectively connected with one fixing part.

According to the utility model discloses a heat-generating body, through the gradual change structure of injecing the connecting portion cross-sectional area, when guaranteeing that connecting portion have enough support intensity to the portion that generates heat for the heat-generating body is when the circular telegram generates heat, and because connecting portion are less for the end with the one end that the portion that generates heat is connected, consequently reduced the heat of the portion that generates heat to the conduction of electric conduction portion direction, the heat that makes the production concentrates on the portion region that generates heat, makes atomization effect better, and has improved heat utilization efficiency.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of a heating element according to an embodiment of the present invention;

FIG. 2 is a schematic view showing an actual assembly of the heat-generating body shown in FIG. 1;

FIG. 3 is an alternative embodiment of the heat-generating body shown in FIG. 1;

FIG. 4 is a schematic view showing an actual assembly of the heat-generating body shown in FIG. 3;

FIG. 5 is a schematic structural view of another embodiment of the heating element of the present invention;

FIG. 6 is a schematic structural view of a heating element according to another embodiment of the present invention;

FIG. 7 is a schematic structural view of a heating element according to yet another embodiment of the present invention;

description of the main elements:

100. a heating element; 200. an atomizing base; 201. an atomizing chamber; 300. a support body;

10. a heat generating portion; 11. a first heating section; 12. a second heat generation section; 13. a fixed part; 14. a heater; 15. a series section;

20. a connecting portion; 30. a conductive portion.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1, a heat generating body 100 according to an embodiment of the present invention is a flat plate structure, including a heat generating portion 10, a connecting portion 20 extending along two ends of the heat generating portion 10, and a conductive portion 30 extending from the connecting portion 20 toward a direction away from the heat generating portion 10, wherein a cross-sectional area of the connecting portion 20 gradually increases from one end connected to the heat generating portion 10 to one end close to the conductive portion 30, a maximum cross-sectional area of the connecting portion 20 is smaller than a cross-sectional area of the conductive portion 30, and a minimum cross-sectional area of the connecting portion 20 is larger than a cross-sectional area of a heat generating section in the heat generating portion 10. That is, the maximum width of the connection part 20 is smaller than the width d3 of the conductive part 30, and the minimum width d2 of the connection part 20 is larger than the width d1 of the heat generating section 10.

In practical application, the heating element 100 is assembled in an atomization assembly of an atomizer, and is attached to or embedded in an atomization surface of an oil guide body in the atomization assembly, the conductive part 30 is electrically connected with an electrode of the atomizer in a contact manner, so that the electrode is electrically connected with a power supply and a control circuit, the control circuit controls the power supply to supply power to the heating element 100, and the heating part 10 of the heating element 100 heats and atomizes atomized liquid absorbed in the oil guide body, so as to generate aerosol which can be sucked by a user.

According to the utility model discloses a heat-generating body 100, through the gradual change structure of injecing the cross-sectional area of connecting portion 20, when guaranteeing that connecting portion 20 has enough support intensity to the portion of generating heat 10 for heat-generating body 100 is when the circular telegram generates heat, connecting portion 20 gives out heat fewly, and because the one end that connecting portion 20 is connected with the portion of generating heat 10 is less end, consequently reduced the heat conduction of the portion of generating heat 10 to the direction of leading electricity portion 30, the heat that makes the production concentrates on the portion of generating heat 10 region, make atomization effect better, and improved heat utilization efficiency.

It should be understood that if the minimum cross-sectional area of the connecting portion 20 is smaller than the cross-sectional area of the heat generating section in the heat generating portion 10, the resistance value of the smaller end of the connecting portion 20 is too large, when the heat generating body 100 is powered on to generate heat, the connecting portion 20 generates heat, the heat generating area becomes larger under the same power condition, the heat generated by the heat generating body 100 is dispersed to the connecting portion 20 and the conductive portion 30, the heat is not concentrated to cause the atomization effect to be low, and the taste of the aerosol generated by atomization is affected.

If the cross-sectional area of the end of the connecting portion 20 close to the heat generating section is too large, for example, equal to or larger than the cross-sectional area of the conductive portion 30, although the resistance of the connecting portion 20 is low and heat cannot be generated, the heat generated by the heat generating portion 10 is conducted to the conductive portion 30 through the connecting portion 20 due to the too large connecting area with the heat generating portion 10, which causes too high heat loss, and also causes the problem of low atomization effect due to non-concentrated heat, which affects the taste of aerosol generated by atomization.

The conductive part 30 is preferably a circular shape adapted to the contacted electrode, and two opposite side edges of the connecting part 20 in the width direction are respectively tangent to the conductive part 30, that is, the connecting part 20 extends to the conductive part 30 in a smooth transition manner, or in other words, the end of the connecting part 20 away from the heating part 10 is arc-shaped, so as to form the conductive part 30, thereby ensuring the overall strength of the heating body 100. Preferably, at least one hollow hole is formed in the connecting portion 20 to further reduce the amount of heat conducted from the heat generating portion 10 to the conductive portion 30.

Further, as shown in fig. 2, in order to provide the heat generating unit 10 with sufficient supporting strength, at least one fixing portion 13 is connected to each of both sides of the heat generating unit 10 in the longitudinal direction in the present embodiment. The utility model discloses when heat-generating body 100 is in assembling the atomizer, through leading the fixed heat-generating body 100 of orientation centre gripping about the oil body and the supporter 300 in order to form the heating element, this heating element installs on atomizing base 200's top, the passageway with atomizing base 200 top atomizing chamber 201 intercommunication is seted up to the position that the supporter 300 corresponds the portion of generating heat 10, utilize the supporter 300 to come to support connecting portion 20 and fixed part 13, so that the portion of generating heat 10 pastes completely on leading the oil body, keep the portion of generating heat 10 level and smooth, ensure the portion of generating heat 10 and lead the oil body inseparable.

Further, the ends of the both side fixing parts 13 may protrude from the edge of the supporting body 300, and the protruding parts are bent toward the supporting body 300 to be clamped and clamped to both sides of the supporting body 300, so as to support and preferably fix the heat generating body 100, and to make the heat generating body 10 less likely to deform and displace.

In this embodiment, the heating element 100 is a whole body formed by etching a metal sheet, for example, a conductive metal member such as a nickel sheet, a nickel-chromium sheet, an iron-chromium-aluminum sheet, a stainless steel sheet, a metal titanium sheet or an alloy sheet, or a conductive ceramic, and the material thereof may be selected according to actual conditions. The thickness of the heating element 100 is 0.05 to 0.2mm, preferably 0.1 mm.

For convenience of description, the present embodiment is exemplified with the two conductive portions 30 positioned at both ends of the heat generating body 100 in the transverse direction, and the heat generating portion 10 may have various shapes with uniform heat generation, such as a grid shape, a stripe shape, an S shape, a zigzag shape, a wave shape, a zigzag shape, a spiral shape, a circular shape, or a rectangular shape.

Specifically, referring to fig. 1, the heat generating portion 10 of the present embodiment is a heating wire bent in an S shape or a continuous S shape, and includes a plurality of first heat generating segments 11, the plurality of first heat generating segments 11 are disposed at intervals in a transverse direction and extend substantially in a longitudinal direction, one end of each of two adjacent first heat generating segments 11 is connected together through a second heat generating segment 12, the other end is spaced apart from each other, two free ends of the heat generating portion 10 are respectively connected to two connecting portions 20, that is, the end of the first heat generating segment 11 on the outermost side in the transverse direction, which is far away from the end connected to the second heat generating segment 12, is connected to the connecting portion 20, and preferably, the first heat generating segments 11 are in smooth transition with the connecting portion 20.

The cross-sectional areas of the first heating section 11 and the second heating section 12 are the same, and the first heating sections 11 are sequentially distributed at intervals along the transverse direction, which is beneficial to the uniform distribution of heat in the transverse direction, that is, the width d1 of the first heating section 11 and the second heating section 12 is smaller than the width d2 of the connecting part 20, so that the connecting part 20 generates less heat when the heating body 100 is powered on to generate heat, and the heat generated when the heating body 100 generates heat is concentrated in the region of the heating part 10.

In the present embodiment, the second heat generating section 12 is arc-shaped with a middle portion protruding outward in the longitudinal direction, so as to improve the uniform distribution of heat in the longitudinal direction when the heat generating portion 10 generates heat; each second heat generating section 12 is connected to a fixing portion 13, and the fixing portion 13 extends in a longitudinal direction to enhance a supporting strength of the heat generating portion 10. In other embodiments, the number of the fixing portions 13 may be selected according to the situation, for example, one fixing portion 13 is provided at an interval of one second heat generating section 12 while ensuring the supporting strength of the heat generating portion 10.

FIG. 3 is an alternative embodiment of the heat-generating body 100 shown in FIG. 1, and the heat-generating body 100 of this embodiment is mainly different from the heat-generating body 100 shown in FIG. 1 in that: in order to provide the heat generating body 10 with sufficient support strength, the present embodiment has a part of the fixing portion 13 extending obliquely along one end near the heat generating body 100 and another part of the fixing portion 13 extending obliquely along the other end near the heat generating body 100.

Referring to fig. 4, the present embodiment is directed to an atomizer without a support structure, that is, the heating element 100 is directly mounted on the top end of the atomizing base 200, and since two sides of the atomizing chamber 201 need to penetrate through to communicate with the air outlet pipe of the atomizer, the top surface of the atomizing base 200 is divided into two left and right support surfaces by the atomizing chamber 201. Specifically, the fixing portion 13 located at the left half of the heat generating body 100 is inclined and extended to the left to be supported by the left supporting surface of the atomizing base 200, and the fixing portion 13 located at the right half of the heat generating body 100 is inclined and extended to the right to be supported by the right supporting surface of the atomizing base 200, so that the connecting portion 20 and the fixing portion 13 are supported by the top surface of the atomizing base 200, the heat generating portion 10 is completely attached to the oil guide body, and the heat generating portion 10 is kept flat to ensure that the heat generating portion 10 is not separated from the oil guide body.

Referring to fig. 5, which is a schematic structural diagram of another embodiment of the heating element 100 of the present invention, the main differences between the heating element 100 of the present embodiment and the heating element 100 shown in fig. 1 are: the heating part 10 is an S-shaped or continuous S-shaped bent heating wire and comprises a plurality of first heating sections 11, the first heating sections 11 are longitudinally arranged at intervals and basically extend along the transverse direction, one ends of two adjacent first heating sections 11 are connected together through a second heating section 12, the other ends of the two adjacent first heating sections are mutually separated, and two free ends of the heating part 10 are respectively connected to two connecting parts 20; that is, the end of the first heat-generating segment 11 at the outermost side in the longitudinal direction far from the end connected with the second heat-generating segment 12 is connected with the connecting portion 20, and preferably, the first heat-generating segment 11 is smoothly transited with the connecting portion 20.

The cross-sectional areas of the first heating section 11 and the second heating section 12 are the same, and the first heating sections 11 are sequentially distributed at intervals along the longitudinal direction, which is beneficial to the uniform distribution of heat in the longitudinal direction, that is, the width d1 of the first heating section 11 and the second heating section 12 is smaller than the minimum width d2 of the connecting part 20, so that the connecting part 20 generates less heat when the heating body 100 is powered on to generate heat, and the heat generated when the heating body 100 generates heat is concentrated in the region of the heating part 10.

The second heat generating section 12 is an arc shape with a middle portion protruding outward in the transverse direction, so as to improve the uniform distribution of heat in the transverse direction when the heat generating portion 10 generates heat.

In this embodiment, the fixing portion 13 connected to the second heat generation element 12 may extend in the longitudinal direction, or the fixing portion 13 on one side of the heat generation element 100 may extend obliquely toward the left side, and the fixing portion 13 on the other side of the heat generation element 100 may extend obliquely toward the right side.

In the present embodiment, a fixing portion 13 is further formed at the connection portion of the connecting portion 20 and the first heat generating section 11, and the fixing portion 13 on the second heat generating section 12 is matched to improve the supporting strength and stability of the heat generating portion 10.

Referring to fig. 6, which is a schematic structural view of another embodiment of the heating element 100 of the present invention, the heating portion 10 of the heating element 100 of the present embodiment includes a plurality of rectangular heating wires 14, and the plurality of heating wires 14 are arranged along the transverse direction at intervals and are sequentially connected in series between two connecting portions 20; each heating wire 14 comprises two first heating sections 11 which extend along the longitudinal direction and are parallel and opposite, and two ends of each first heating section 11 are correspondingly connected through a second heating section 12; in the present embodiment, the second heat-generating sections 12 are straight line segments, and each second heat-generating section 12 is connected with a fixing portion 13 extending in the longitudinal direction.

The cross-sectional areas of the first heating section 11 and the second heating section 12 are the same, and the first heating sections 11 are sequentially distributed at intervals along the transverse direction, so that the heat is uniformly distributed in the transverse direction, that is, the width d1 of the first heating section 11 and the second heating section 12 is smaller than the minimum width d2 of the connecting part 20, so that the connecting part 20 generates less heat when the heating body 100 is powered on to generate heat, and the heat generated when the heating body 100 generates heat is concentrated in the region of the heating part 10.

It should be noted that two adjacent heating wires 14 are connected by the series connection portion 15, and two ends of the series connection portion 15 are respectively connected to the middle of the first heating section 11 on the corresponding side of the two adjacent heating wires 14, that is, the straight line where the series connection portion 15 is located divides the plurality of heating wires 14 into two vertically symmetrical parts, that is, the upper part and the lower part of each heating wire 14 are in a parallel structure, and the plurality of heating wires 14 are in a series structure. In addition, smooth transition is carried out between the first heating section 11 and the second heating section 12, so that heat is uniformly distributed, and the occurrence of frying oil caused by concentrated heat stacking at the sharp corner position is avoided.

Referring to fig. 7, which is a schematic structural view of another embodiment of the heating element 100 of the present invention, the heating portion 10 of the heating element 100 of the present embodiment includes a plurality of rhombic heating wires 14, the plurality of heating wires 14 are sequentially connected in series between two connecting portions 20 along a transverse direction, and a cross-sectional area of each heating wire 14 is smaller than a minimum cross-sectional area of each connecting portion 20.

Specifically, the heating wire 14 includes two mutually parallel first heating sections 11 and two mutually parallel second heating sections 12, and the two first heating sections 11 and the two second heating sections 12 together form the heating wire 14 in a rhombus shape. The first and second

heat generation sections

11 and 12 have the same cross-sectional area, that is, the width of the first and second

heat generation sections

11 and 12 is d1 and is smaller than the minimum width d2 of the connection portion 20, so that the connection portion 20 generates less heat when the heat generation body 100 is energized to generate heat, and the heat generated when the heat generation body 100 generates heat is concentrated in the heat generation portion 10.

The short axis direction of a plurality of heater 14 sets up along transversely, and the major axis direction sets up along vertically, and a plurality of heater 14 direct series connection in this embodiment, and the tie point between two arbitrary adjacent heater 14 all is located heat-generating body 100 along fore-and-aft central line to two upper and lower parts heat along longitudinal direction when making heater 14 generate heat is the same, is favorable to heat evenly distributed. Of course, in other embodiments, several heating wires 14 may be arranged at intervals and connected in series in sequence.

In the present embodiment, each heating wire 14 has a fixing portion 13 connected to each end in the longitudinal direction, and the fixing portions 13 extend in the longitudinal direction, that is, each fixing portion 13 and the connected first heating section 11 and second heating section 12 form a Y-shaped structure, so that the supporting strength of the heating portion 10 is improved.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

Above is the description to the technical scheme that the utility model provides, to technical personnel in the field, according to the utility model discloses the thought of embodiment all has the change part on concrete implementation and range of application, to sum up, this description content should not be understood as the restriction of the utility model.

Claims

1. The heating body is characterized in that the heating body is a flat plate-shaped structure formed by etching a metal sheet, and comprises a heating part, a connecting part and a conductive part, wherein the connecting part is formed by extending two ends of the heating part, the conductive part is formed by extending the connecting part in the direction away from the heating part, the cross section area of the connecting part is gradually increased and extended from one end connected with the heating part to one end close to the conductive part, the maximum cross section area of the connecting part is smaller than that of the conductive part, and the minimum cross section area of the connecting part is larger than that of a heating section in the heating part.

2. A heat-generating body as described in claim 1, wherein said conductive portion is circular, and two opposite side edges of said connection portion in the width direction are respectively tangent to said conductive portion.

3. A heat-generating body as described in claim 1, wherein at least one hollowed-out hole is opened in said connecting portion.

4. A heat-generating body as described in claim 1, characterized in that the thickness of the heat-generating body is 0.05 to 0.2 mm.

5. The heat-generating body as described in claim 1, wherein two of said conductive parts are located at both ends of said heat-generating body in the transverse direction, and said heat-generating part is in a lattice shape, a stripe shape, an S shape, a zigzag shape, a wave shape, a zigzag shape, a spiral shape, a circular shape or a rectangular shape.

6. The heat-generating body as described in claim 5, wherein at least one fixing portion is connected to each of both sides of the heat-generating portion in the longitudinal direction.

7. A heat-generating body as described in claim 6, wherein said heat-generating portion is a heat-generating wire which is S-shaped or continuously S-shaped bent and includes a plurality of first heat-generating sections which are arranged at a spacing in the lateral direction and extend substantially in the longitudinal direction, and two adjacent ones of said first heat-generating sections are connected together at one end thereof via a second heat-generating section and are spaced apart from each other at the other end thereof, and two free ends of said heat-generating portion are connected to two of said connecting portions, respectively; the first heating section and the second heating section have the same cross-sectional area and are smaller than the minimum cross-sectional area of the connecting part.

8. The heat-generating body as claimed in claim 6, characterized in that the heat-generating portion is a heating wire which is bent in an S-shape or a continuous S-shape, and comprises a plurality of first heat-generating sections which are arranged at intervals in a longitudinal direction and extend substantially in a transverse direction, and one ends of two adjacent first heat-generating sections are connected together through a second heat-generating section, and the other ends are spaced from each other, and two free ends of the heat-generating portion are connected to two of the connecting portions, respectively; the first heating section and the second heating section have the same cross-sectional area and are smaller than the minimum cross-sectional area of the connecting part.

9. The heat-generating body as claimed in claim 6, characterized in that the heat-generating portion includes a plurality of rectangular heat-generating wires which are arranged at a spacing in a lateral direction and are connected in series between two of the connecting portions in this order; each heating wire comprises two first heating sections which extend along the longitudinal direction and are opposite in parallel, and two ends of each first heating section are correspondingly connected through a second heating section; the first and second heat generation sections have the same cross-sectional area and are smaller than the minimum cross-sectional area of the connection portion.

10. A heat-generating body as described in any one of claims 7 to 9, characterized in that one said fixing portion is connected to each said second heat-generating segment.

11. A heat-generating body as described in claim 10, characterized in that the fixing portion extends in a longitudinal direction.

12. A heat-generating body as described in claim 10, wherein a part of said fixing portion extends obliquely along one end near said heat-generating body, and another part of said fixing portion extends obliquely along the other end near said heat-generating body.

13. A heat-generating body as described in claim 10, wherein said second heat-generating section has an arc shape with a middle portion projecting outward.

14. A heat-generating body as described in claim 8, characterized in that a joint of said connecting portion and said first heat-generating segment is further extended to form one of said fixing portions.

15. The heat-generating body according to claim 6, characterized in that the heat-generating body includes a plurality of rhombus-shaped heating wires, and a plurality of the heating wires are connected in series between two of the connecting portions in the transverse direction; the cross-sectional area of the heating wire is smaller than the minimum cross-sectional area of the connecting part.

16. A heat-generating body as described in claim 15, wherein a short axis direction of a plurality of said heat-generating wires is arranged in a transverse direction, a long axis direction is arranged in a longitudinal direction, and both ends in the long axis direction of each of said heat-generating wires are connected to one of said fixing portions, respectively.