CN217446670U

CN217446670U - Heating body

Info

Publication number: CN217446670U
Application number: CN202220053499.2U
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: 2022-09-20
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 conductive part that forms along the portion both ends that generate heat and extend the extension that forms to keeping away from the portion direction that generates heat by the conductive part, the cross-sectional area of conductive part is extended to the one end crescent near the extension by the one end that is close to the portion that generates heat, and the minimum cross-sectional area of conductive part is greater than the cross-sectional area of the section area of extension and the cross-sectional area of the section that generates heat in the portion that generates heat. The utility model is connected with the frame area after the metal sheet is etched through the extending parts at the two ends of the heating body, thereby being convenient for realizing mass production; through the gradual change structure of injecing the conducting part cross-sectional area, when guaranteeing that the conducting part has enough support intensity to the portion that generates heat for the heat-generating body is when the circular telegram generates heat, and conducting part calorific capacity is few, has reduced the heat of the portion that generates heat to the conduction of conducting part direction simultaneously, makes the heat of production concentrate 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. Moreover, the existing heating nets are manufactured separately and singly, and the production efficiency is low.

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 achieve the above object, the utility model provides a heat-generating body, the heat-generating body is dull and stereotyped sheet structure, including the portion that generates heat, follow the portion both ends that generate heat extend the conductive part that forms and by the conductive part is to keeping away from the extension that the portion direction of generating heat extended the formation, the cross-sectional area of conductive part is by being close to the one end of the portion that generates heat is to being close to the one end crescent extension of extension, just the minimum cross-sectional area of conductive part is greater than the cross-sectional area of extension and the cross-sectional area of the section that generates heat in the portion that generates heat.

Optionally, at least one hollow hole is further formed in a region of the conductive portion, which is close to the heat generating 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 plurality of 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 conductive portions respectively; the first heat generation section and the second heat generation section have the same cross-sectional area and are smaller than the minimum cross-sectional area of the conductive portion.

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 conductive portions; the first heat generation section and the second heat generation section have the same cross-sectional area and are smaller than the minimum cross-sectional area of the conductive portion.

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 conductive 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 heat generation section and the second heat generation section have the same cross-sectional area and are smaller than the minimum cross-sectional area of the conductive portion.

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 portion of the conductive portion and the first heat generation section is further extended to form one of the fixing portions.

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 conductive portions along the transverse direction; the cross-sectional area of the heating wire is smaller than the minimum cross-sectional area of the conductive portion.

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 heating body of the utility model, the extending parts at the two ends of the heating body are connected with the frame area after the metal sheet is etched, thereby being convenient for realizing mass production; through the gradual change structure of injecing the conducting part cross-sectional area, when guaranteeing that the conducting part has sufficient support intensity to the portion that generates heat for the heat-generating body is when the circular telegram generates heat, and because the conducting part is the less 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 conducting part direction, make the heat of generating heat concentrate on the region of generating heat, make the atomization effect better, and 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 a structure in mass production of the heat-generating body shown in FIG. 1;

FIG. 3 is a schematic view showing an actual assembly of the heat-generating body shown in FIG. 1;

FIG. 4 is an alternative embodiment of the heat-generating body shown in FIG. 1;

FIG. 5 is a schematic view showing an actual assembly of the heat-generating body shown in FIG. 4;

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

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

FIG. 8 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; 101. an etching region; 102. a frame region; 200. an atomizing base; 201. an atomizing chamber; 300. a support body;

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

20. a conductive portion; 21. a contact region; 30. an extension 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 the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and 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 therefore, 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 conductive portion 20 formed by extending along two ends of the heat generating portion 10, and an extending portion 30 formed by extending the conductive portion 20 in a direction away from the heat generating portion 10, wherein a cross-sectional area of the conductive portion 20 gradually increases from one end close to the heat generating portion 10 to one end close to the extending portion 30, and a minimum cross-sectional area of the conductive portion 20 is greater than a cross-sectional area of the extending portion 30 and a cross-sectional area of a heat generating section in the heat generating portion 10. That is, the minimum width d2 of the conductive portion 20 is greater than the width d3 of the extension portion 30 and the width d1 of the heat generating segment in the heat generating portion 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 20 is electrically connected with an electrode of the atomizer in a contact manner, so that the conductive part is electrically connected with a power supply and a control circuit through the electrode, 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.

The heating element 100 of this embodiment is an integral body formed by etching a metal sheet, and 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 is used, and the material thereof may be selected according to actual conditions, and the thickness of the heating element 100 is 0.05 to 0.2mm, preferably 0.1 mm.

As shown in fig. 2, during actual manufacturing, a whole large-sized metal sheet is selected, the metal sheet is divided into an etching area 101, a forming area surrounded by the etching area 101 and corresponding to the heating elements 100, and a frame area 102 surrounding each forming area and the etching area 101, after the etching area 101 is removed, each heating element 100 formed in the forming area is connected with the frame area 102 through the extending portions 30 at two ends thereof, so that a plurality of heating elements 100 can be automatically cut from the metal sheet, and mass production can be realized.

Specifically, rectangular or triangular connection points are formed at positions of the frame area 102 corresponding to the extension portions 30, the extension portions 30 are connected with the frame area 102 through the connection points, and the contact width between the extension portions 30 and the connection points is greater than 0.15mm or less than 3mm, preferably 2mm, so that the cutting traces on the extension portions 30 are reduced, and the cutting traces are located on the extension portions 30, so that the cutting traces avoid the contact area with the electrodes, and the conductive portions 20 are ensured to be stably contacted with the electrodes.

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

It should be understood that if the minimum cross-sectional area of the conductive 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 conductive portion 20 is too large, when the heat generating body 100 is powered on to generate heat, the smaller end of the conductive portion 20 generates heat to generate a large amount of heat, under the same power condition, the heat generating area becomes large, the heat generated by the heat generating body 100 is dispersed to the conductive portion 20 and the extending 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 conductive portion 20 close to the heat generating section is too large, for example, the conductive portion 20 is rectangular, although the resistance of the conductive portion 20 is low and heat cannot be generated, the heat generated by the heat generating portion 10 is conducted to the conductive portion 20 due to the large connecting area between the conductive portion 20 and 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.

In order to facilitate the contact connection between the conductive part 20 and the electrode, the end of the conductive part 20 away from the heat generating part 10 is arc-shaped, so as to form a circular contact area 21 adapted to the size of the contacted electrode, thereby ensuring the contact area between the conductive part 20 and the electrode and the overall strength of the heat generating body 100. Preferably, the conductive portion 20 is formed with at least one hollow hole at a position outside the contact area 21, so as to further reduce the amount of heat conducted from the heat generating portion 10 to the conductive portion 20.

Further, as shown in fig. 3, in order to provide the heat generating portion 10 with sufficient supporting strength, the heat generating portion 10 of the present embodiment is connected with at least one fixing portion 13 at each of two sides in the longitudinal direction. The utility model discloses when heat-generating body 100 is in assembling the atomizer, through the fixed heat-generating body 100 of direction centre gripping about the oil guide 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 conductive part 20 and fixed part 13, so that the portion of generating heat 10 pastes completely on the oil guide body, keep the portion of generating heat 10 level and smooth, ensure the portion of generating heat 10 and lead the inseparable of oil body.

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.

For convenience of description, the present embodiment is exemplified with the two conductive parts 20 positioned at both ends of the heat generating body 100 in the lateral direction, and the heat generating part 10 may have various shapes generating heat more uniformly, 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 an S-shaped or continuous S-shaped bent heat generating wire 14, and includes a plurality of first heat generating segments 11, the plurality of first heat generating segments 11 are disposed at intervals along the transverse direction and extend substantially along the 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 conductive portions 20, that is, the end of the first heat generating segment 11 at the outermost side along the transverse direction far away from the end connected to the second heat generating segment 12 is connected to the conductive portion 20, and preferably, the first heat generating segment 11 and the conductive portion 20 are in smooth transition.

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 conductive part 20, so that the conductive 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. 4 shows 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. 5, the present embodiment is directed to an atomizer without a support 300, 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 to communicate with the outlet duct 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 conductive 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 and the oil guide body are not separated.

Referring to fig. 6, which is a schematic structural view 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 14 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 with two conductive parts 20; that is, the end of the first heat-generating section 11 at the outermost side in the longitudinal direction away from the end connected with the second heat-generating section 12 is connected with the conductive part 20, and preferably, the first heat-generating section 11 is smoothly transited with the conductive part 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 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 conductive part 20, so that the conductive part 20 generates less heat when the heating element 100 is powered on to generate heat, and the heat generated when the heating element 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 conductive 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. 7, a schematic structural diagram of another embodiment of the heating element 100 of the present invention is shown, in which a 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 a transverse direction at intervals and are sequentially connected in series between two conductive 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 distributed at intervals in 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 minimum width d2 of the conductive part 20, so that the conductive part 20 generates less heat when the heating element 100 is powered on to generate heat, and the heat generated when the heating element 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. 8, 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 diamond-shaped heating wires 14, the plurality of heating wires 14 are sequentially connected in series between two conductive portions 20 along a transverse direction, and a cross-sectional area of the heating wire 14 is smaller than a minimum cross-sectional area of the conductive portions 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 conductive portion 20, so that the conductive 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 region.

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, the fixing portions 13 are respectively connected to both ends of each heating wire 14 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 above 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 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. A heat-generating body characterized in that the heat-generating body is a flat plate-like structure formed by etching a metal sheet, and comprises a heating portion, conductive portions formed by extending along both ends of the heating portion, and extending portions formed by extending the conductive portions in a direction away from the heating portion, the cross-sectional area of the conductive portions gradually increases from one end close to the heating portion to one end close to the extending portions, and the minimum cross-sectional area of the conductive portions is larger than the cross-sectional area of the extending portions and the cross-sectional area of a heating section in the heating portion.

2. A heat-generating body as described in claim 1, characterized in that the width of said extending portion is more than 0.15mm and less than 3 mm.

3. The heat-generating body as described in claim 1, wherein at least one hollowed-out hole is further opened in a region of said conductive portion near said heat-generating portion.

4. 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.

5. The heat-generating body as described in claim 4, wherein at least one fixing portion is connected to each of both sides of the heat-generating portion in the longitudinal direction.

6. A heat-generating body as described in claim 5, 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 electrically conductive portions, respectively; the first heat generation section and the second heat generation section have the same cross-sectional area and are smaller than the minimum cross-sectional area of the conductive portion.

7. The heat-generating body as claimed in claim 5, characterized in that the heat-generating portion is a heat-generating wire which is bent in an S-shape or a continuous S-shape, and includes a plurality of first heat-generating segments 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 segments are connected together through a second heat-generating segment and the other ends are spaced from each other, and two free ends of the heat-generating portion are connected to two of the conductive portions, respectively; the first heat generation section and the second heat generation section have the same cross-sectional area and are smaller than the minimum cross-sectional area of the conductive portion.

8. The heat-generating body as claimed in claim 5, 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 electrically conductive 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 heat generation section and the second heat generation section have the same cross-sectional area and are smaller than the minimum cross-sectional area of the conductive portion.

9. A heat-generating body as described in any one of claims 6 to 8, characterized in that one said fixing part is connected to each said second heat-generating segment.

10. A heat-generating body as described in claim 9, characterized in that the fixing portion extends in a longitudinal direction.

11. A heat-generating body as described in claim 9, wherein a part of said fixing portion extends obliquely along one end close to said heat-generating body, and another part of said fixing portion extends obliquely along the other end close to said heat-generating body.

12. A heat-generating body as described in claim 9, wherein said second heat-generating section has an arc shape with a middle portion projecting outward.

13. A heat-generating body as described in claim 7, wherein a junction of said electrically conductive portion and said first heat-generating segment is further extended to form one of said fixing portions.

14. The heat-generating body according to claim 5, characterized in that the heat-generating portion includes a plurality of diamond-shaped heat generating wires, and the plurality of heat generating wires are connected in series between the two conductive portions in the transverse direction; the cross-sectional area of the heating wire is smaller than the minimum cross-sectional area of the conductive part.

15. A heat-generating body as described in claim 14, 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.