A heating element

Abstract

The application relates to a heating body, which is a flat sheet structure formed by etching a metal sheet, comprising a heating part, a connecting part extending along both ends of the heating part, and a conductive part extending from the connecting part to a direction away from the heating part, the cross-sectional area of the connecting part gradually increases from one end close to the heating part to one end close to the conductive part, the maximum cross-sectional area of the connecting part is smaller than that of the conductive part, and the minimum cross-sectional area of the connecting part is larger than that of the heating part. The application limits the gradient structure of the cross-sectional area of the connecting part, ensures that the connecting part has sufficient supporting strength for the heating part, and makes the heating body have less heat when electrified, and since the one end of the connecting part connected with the heating part is a smaller end, the heat conduction of the heating part to the conductive part is reduced, the generated heat is concentrated in the heating part area, the atomization effect is better, and the heat utilization efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of electronic atomization technology, and in particular relates to a heating element. Background Technology

[0002] Currently, the heating mesh used in electronic atomizers typically has conductive areas at both ends of the central heating area, with each conductive area electrically connected to an electrode. However, because the connection area between the heating area and the conductive areas at both ends of the existing heating mesh is too large, too much heat generated in the heating area is conducted to the conductive areas, resulting in poor actual heating efficiency. Summary of the Invention

[0003] The purpose of this invention is to at least partially address the shortcomings of the prior art and provide a heating element.

[0004] To achieve the above objectives, the present invention provides a heating element, which is a flat sheet structure formed by etching a metal sheet, including a heating part, a connecting part extending from both ends of the heating part, and a conductive part extending from the connecting part away from the heating part. The cross-sectional area of ​​the connecting part gradually increases from the end near the heating part to the end near the conductive part, and the maximum cross-sectional area of ​​the connecting part is smaller than the cross-sectional area of ​​the conductive part, and the minimum cross-sectional area of ​​the connecting part is larger than the cross-sectional area of ​​the heating segment in the heating part.

[0005] Optionally, the conductive part is circular, and the two opposite sides of the connecting part along the width direction are tangent to the conductive part.

[0006] Optionally, the connecting portion has at least one perforated hole.

[0007] Optionally, the thickness of the heating element is 0.05-0.2 mm.

[0008] Optionally, the two conductive parts are located at both ends of the heating element in the lateral direction, and the heating parts are grid-shaped, striped, S-shaped, zigzag-shaped, wavy, sawtooth-shaped, spiral, circular or rectangular.

[0009] Optionally, the heating element is connected to at least one fixing part on each of its two longitudinal sides.

[0010] Optionally, the heating element is an S-shaped or continuously S-shaped heating wire, including a plurality of first heating segments. The plurality of first heating segments are arranged laterally at intervals and extend substantially longitudinally. One end of two adjacent first heating segments is connected together through a second heating segment, and the other end is separated from each other. The two free ends of the heating element are respectively connected to two connecting portions. The cross-sectional areas of the first heating segments and the second heating segments are the same and smaller than the minimum cross-sectional area of ​​the connecting portions.

[0011] Optionally, the heating element is a heating wire that is S-shaped or continuously S-shaped, including a plurality of first heating segments. The plurality of first heating segments are arranged longitudinally at intervals and extend substantially laterally. One end of two adjacent first heating segments is connected together through a second heating segment, and the other end is separated from each other. The two free ends of the heating element are respectively connected to two connecting portions. The cross-sectional areas of the first heating segments and the second heating segments are the same and smaller than the minimum cross-sectional area of ​​the connecting portions.

[0012] Optionally, the heating element includes a plurality of rectangular heating wires, which are spaced apart laterally and connected in series between the two connecting parts; each heating wire includes two first heating segments that extend longitudinally and are parallel to each other, and the two ends of the two first heating segments are respectively connected by a second heating segment; the cross-sectional areas of the first heating segments and the second heating segments are the same and smaller than the minimum cross-sectional area of ​​the connecting part.

[0013] Optionally, each of the second heating segments is connected to one of the fixing parts.

[0014] Optionally, the fixing part extends longitudinally.

[0015] Optionally, a portion of the fixing part extends obliquely along one end close to the heating element, and another portion of the fixing part extends obliquely along the other end close to the heating element.

[0016] Optionally, the second heating segment has an arc shape that bulges outward from the center.

[0017] Optionally, the connection between the connecting portion and the first heating segment may further extend to form a fixing portion.

[0018] Optionally, the heating element includes a plurality of rhomboid heating wires, which are connected in series in the transverse direction between the two connecting parts; the cross-sectional area of ​​the heating wires is smaller than the minimum cross-sectional area of ​​the connecting part.

[0019] Optionally, the short axis of the heating wires is arranged laterally, the long axis is arranged longitudinally, and each heating wire is connected to a fixing part at both ends of the long axis.

[0020] According to the heating element of the present invention, by defining a gradually changing structure for the cross-sectional area of ​​the connecting part, while ensuring that the connecting part has sufficient support strength for the heating part, the connecting part generates less heat when the heating element is energized. Furthermore, since the end of the connecting part that is connected to the heating part is the smaller end, the heat conduction from the heating part to the conductive part is reduced, so that the generated heat is concentrated in the heating part area, resulting in better atomization and improved heat utilization efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of an embodiment of the heating element of the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of the actual assembly of the heating element shown;

[0024] Figure 3 for Figure 1 Alternative embodiments of the heating element shown;

[0025] Figure 4 for Figure 3 A schematic diagram of the actual assembly of the heating element shown;

[0026] Figure 5 This is a schematic diagram of another embodiment of the heating element of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of another embodiment of the heating element of the present invention;

[0028] Figure 7 This is a schematic diagram of another embodiment of the heating element of the present invention;

[0029] Main component description:

[0030] 100. Heating element; 200. Atomizing base; 201. Atomizing chamber; 300. Support body;

[0031] 10. Heating element; 11. First heating section; 12. Second heating section; 13. Fixing part; 14. Heating wire; 15. Connecting part;

[0032] 20. Connecting part; 30. Conductive part. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should 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," and "radial," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying 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 this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] Please see Figure 1 As shown, this embodiment of the invention provides a heating element 100, which is a flat sheet structure including a heating part 10, a connecting part 20 extending from both ends of the heating part 10, and a conductive part 30 extending from the connecting part 20 away from the heating part 10. The cross-sectional area of ​​the connecting part 20 gradually increases from the end connected to the heating part 10 to the end connected to the conductive part 30, and the maximum cross-sectional area of ​​the connecting part 20 is smaller than the cross-sectional area of ​​the conductive part 30, while the minimum cross-sectional area of ​​the connecting part 20 is larger than the cross-sectional area of ​​the heating segment in the heating part 10. That is, the maximum width of the connecting part 20 is smaller than the width d3 of the conductive part 30, and the minimum width d2 of the connecting part 20 is larger than the width d1 of the heating segment in the heating part 10.

[0037] In practical applications, the heating element 100 is assembled into the atomization assembly of the atomizer, and is attached to or embedded in the atomization surface of the oil guide body in the atomization assembly. The conductive part 30 is electrically connected to the electrode of the atomizer, and is electrically connected to the power supply and control circuit through the electrode. The control circuit controls the power supply to supply power to the heating element 100, so that the heating part 10 of the heating element 100 heats and atomizes the atomized liquid absorbed in the oil guide body to produce an aerosol that can be inhaled by the user.

[0038] According to the present invention, the heating element 100, by defining the gradual structure of the cross-sectional area of ​​the connecting part 20, ensures that the connecting part 20 has sufficient support strength for the heating part 10, while making the heating element 100 generate less heat when it is powered on. Since the end of the connecting part 20 connected to the heating part 10 is the smaller end, the conduction of heat from the heating part 10 to the conductive part 30 is reduced, so that the generated heat is concentrated in the area of ​​the heating part 10, resulting in better atomization effect and improved heat utilization efficiency.

[0039] It should be understood that if the minimum cross-sectional area of ​​the connecting part 20 is smaller than the cross-sectional area of ​​the heating section in the heating part 10, the resistance at the smaller end of the connecting part 20 will be too large. When the heating body 100 is powered on, the connecting part 20 will generate heat. Under the same power conditions, the heating area will become larger, and the heat generated by the heating body 100 will be dispersed to the connecting part 20 and the conductive part 30. The heat will not be concentrated, resulting in a low atomization effect and affecting the taste of the aerosol produced by atomization.

[0040] If the cross-sectional area of ​​the end of the connecting part 20 near the heating section is too large, for example, equal to or greater than the cross-sectional area of ​​the conductive part 30, although the resistance of the connecting part 20 is low and it cannot generate heat, the heat generated by the heating part 10 is conducted to the conductive part 30 through the connecting part 20 due to the large connection area between the connecting part 20 and the heating part 10, resulting in excessive heat loss. Similarly, the problem of low atomization effect due to uneven heat concentration also exists, affecting the taste of the aerosol produced by atomization.

[0041] Preferably, the conductive portion 30 is circular and adapted to the contact electrode. The two opposite sides of the connecting portion 20 along its width are tangent to the conductive portion 30, meaning the connecting portion 20 extends smoothly to the conductive portion 30. Alternatively, the end of the connecting portion 20 away from the heating portion 10 is arc-shaped, thus forming the conductive portion 30. This ensures the overall strength of the heating element 100. Preferably, at least one perforation may be provided in the connecting portion 20 to further reduce heat conduction from the heating portion 10 to the conductive portion 30.

[0042] Furthermore, combined Figure 2As shown, in order to provide sufficient support strength for the heating element 10, in this embodiment, the heating element 10 is connected to at least one fixing part 13 on each of its two longitudinal sides. When the heating element 100 of the present invention is assembled into the atomizer, it is clamped and fixed by the oil guide body and the support body 300 in the vertical direction to form a heating assembly. The heating assembly is installed at the top of the atomizing base 200. The support body 300 has a channel corresponding to the position of the heating element 10, which communicates with the atomizing cavity 201 at the top of the atomizing base 200. The support body 300 is used to support the connecting part 20 and the fixing part 13 so that the heating element 10 is completely attached to the oil guide body, keeping the heating element 10 flat and ensuring that the heating element 10 does not separate from the oil guide body.

[0043] Furthermore, the ends of the two fixing parts 13 can protrude from the edge of the support body 300. By bending the protruding parts toward the support body 300, they are clamped and locked to both sides of the support body 300 to support and better fix the heating element 100, so that the heating element 10 is not easily deformed or displaced.

[0044] In this embodiment, the heating element 100 is a single piece formed by etching a metal sheet. For example, it can be a conductive metal component such as a nickel sheet, nickel-chromium sheet, iron-chromium-aluminum sheet, stainless steel sheet, titanium sheet, or alloy sheet. It can also be conductive ceramic; the material can be selected according to the specific circumstances. The thickness of the heating element 100 is 0.05-0.2 mm, preferably 0.1 mm.

[0045] For ease of explanation, this embodiment uses the two conductive parts 30 located at the two ends of the heating element 100 in the lateral direction as an example. The heating part 10 can be various shapes that can generate relatively uniform heat, such as grid, stripe, S-shape, zigzag, wave, sawtooth, spiral, circular or rectangular.

[0046] Specifically, refer to Figure 1 As shown, in this embodiment, the heating element 10 is a heating wire that is S-shaped or continuously S-shaped and includes a plurality of first heating segments 11. The plurality of first heating segments 11 are arranged at intervals in the transverse direction and extend substantially in the longitudinal direction. One end of two adjacent first heating segments 11 is connected together through a second heating segment 12, and the other end is separated from each other. The two free ends of the heating element 10 are respectively connected to two connecting parts 20. That is, the end of the first heating segment 11 on the outermost side in the transverse direction that is away from the connection with the second heating segment 12 is connected to the connecting part 20. Preferably, the first heating segment 11 and the connecting part 20 are smoothly transitioned.

[0047] The first heating segment 11 and the second heating segment 12 have the same cross-sectional area. With several first heating segments 11 distributed sequentially and alternately in the transverse direction, it is beneficial to the uniform distribution of heat in the transverse direction. That is, the width d1 of the first heating segment 11 and the second heating segment 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 energized and the heat generated when the heating body 100 is heated is concentrated in the area of ​​the heating part 10.

[0048] In this embodiment, the second heating segment 12 has an arc shape that protrudes outward along the longitudinal direction in the middle to improve the uniform distribution of heat in the longitudinal direction when the heating element 10 is heating. Each second heating segment 12 is connected to a fixing part 13, which extends longitudinally to improve the support strength for the heating element 10. In other embodiments, the number of fixing parts 13 can be selected as needed. For example, while ensuring the support strength for the heating element 10, a fixing part 13 can be provided at intervals of one second heating segment 12.

[0049] Figure 3 for Figure 1 The heating element 100 shown is an alternative embodiment. In this embodiment, the heating element 100 is the same as... Figure 1 The main difference of the heating element 100 shown is that, in order to provide sufficient support strength for the heating part 10, in this embodiment, one part of the fixing part 13 extends obliquely along one end close to the heating element 100, and the other part of the fixing part 13 extends obliquely along the other end close to the heating element 100.

[0050] Combination Figure 4 As shown, this embodiment targets an atomizer without a supporting structure, where the heating element 100 is directly mounted on the top of the atomizing base 200. Since the atomizing chamber 201 needs to extend through both sides to connect with the atomizer's outlet pipe, the top surface of the atomizing base 200 is divided into left and right supporting surfaces by the atomizing chamber 201. Specifically, the fixing part 13 located on the left half of the heating element 100 extends obliquely to the left, thus being supported by the left supporting surface of the atomizing base 200. The fixing part 13 located on the right half of the heating element 100 extends obliquely to the right, thus being supported by the right supporting surface of the atomizing base 200. In this way, the top surface of the atomizing base 200 supports the connecting part 20 and the fixing part 13, ensuring that the heating element 10 is completely attached to the oil guide body, keeping the heating element 10 flat, and ensuring that the heating element 10 does not separate from the oil guide body.

[0051] Please see Figure 5 The diagram shown is a structural schematic of another embodiment of the heating element 100 of the present invention. In this embodiment, the heating element 100 is similar to... Figure 1The main difference of the heating element 100 shown is that the heating part 10 is a heating wire that is S-shaped or continuously S-shaped, including a plurality of first heating segments 11. The plurality of first heating segments 11 are arranged longitudinally at intervals and extend basically in the transverse direction. One end of two adjacent first heating segments 11 is connected together through a second heating segment 12, and the other end is separated from each other. The two free ends of the heating part 10 are respectively connected to two connecting parts 20. That is, the end of the outermost first heating segment 11 along the longitudinal direction away from the connection with the second heating segment 12 is connected to the connecting part 20. Preferably, the first heating segment 11 and the connecting part 20 are smoothly transitioned.

[0052] The first heating segment 11 and the second heating segment 12 have the same cross-sectional area. With several first heating segments 11 distributed sequentially along the longitudinal direction, it is beneficial to the uniform distribution of heat in the longitudinal direction. That is, the width d1 of the first heating segment 11 and the second heating segment 12 is less 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 energized and the heat generated when the heating body 100 is heated is concentrated in the area of ​​the heating part 10.

[0053] The second heating section 12 is an arc shape that bulges outward in the middle along the lateral direction to improve the uniform distribution of heat in the lateral direction when the heating section 10 is heating.

[0054] In this embodiment, the fixing part 13 connected to the second heating section 12 can extend longitudinally, or the fixing part 13 on one side of the heating body 100 can extend inclined to the left, and the fixing part 13 on the other side of the heating body 100 can extend inclined to the right.

[0055] In this embodiment, a fixing part 13 is also formed at the connection between the connecting part 20 and the first heating section 11. In conjunction with the fixing part 13 on the second heating section 12, the support strength and stability of the heating part 10 can be improved.

[0056] Please see Figure 6 The diagram shown is a structural schematic of another embodiment of the heating element 100 of the present invention. In this embodiment, the heating part 10 of the heating element 100 includes a plurality of rectangular heating wires 14. The plurality of heating wires 14 are arranged at intervals along the lateral direction and are connected in series between two connecting parts 20. Each heating wire 14 includes two first heating segments 11 that extend longitudinally and are parallel to each other. The two ends of the two first heating segments 11 are respectively connected to the corresponding second heating segments 12. In this embodiment, the second heating segments 12 are straight segments, and each second heating segment 12 is connected to a fixing part 13 that extends longitudinally.

[0057] The first heating segment 11 and the second heating segment 12 have the same cross-sectional area. With several first heating segments 11 distributed sequentially and alternately in the transverse direction, it is beneficial to the uniform distribution of heat in the transverse direction. That is, the width d1 of the first heating segment 11 and the second heating segment 12 is less 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 energized and the heat generated when the heating body 100 is heated is concentrated in the area of ​​the heating part 10.

[0058] It should be noted that adjacent heating wires 14 are connected by a series connection 15, and the two ends of the series connection 15 are respectively connected to the middle of the first heating segment 11 on the corresponding side of the two adjacent heating wires 14. That is, the straight line of the series connection 15 divides the heating wires 14 into two symmetrical parts, meaning that the upper and lower parts of each heating wire 14 are in parallel, and the heating wires 14 are in series. In addition, the smooth transition between the first heating segment 11 and the second heating segment 12 is conducive to the even distribution of heat and avoids the accumulation of heat at sharp corners, which could cause oil splattering.

[0059] Please see Figure 7 The diagram shown is a structural schematic of another embodiment of the heating element 100 of the present invention. In this embodiment, the heating part 10 of the heating element 100 includes a plurality of rhomboid heating wires 14. The plurality of heating wires 14 are connected in series in the transverse direction between two connecting parts 20. The cross-sectional area of ​​the heating wires 14 is smaller than the minimum cross-sectional area of ​​the connecting part 20.

[0060] Specifically, the heating wire 14 includes two parallel first heating segments 11 and two parallel second heating segments 12, which together form a rhomboid heating wire 14. The cross-sectional areas of the first heating segments 11 and the second heating segments 12 are the same, that is, the width of the first heating segments 11 and the second heating segments 12 is d1, which 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 energized and the heat generated by the heating body 100 is concentrated in the heating part 10 area.

[0061] A plurality of heating wires 14 are arranged laterally along their minor axis and longitudinally along their major axis. In this embodiment, the heating wires 14 are directly connected in series, and the connection point between any two adjacent heating wires 14 is located on the longitudinal centerline of the heating element 100. This ensures that the upper and lower parts of the heating wire 14 generate the same amount of heat in the longitudinal direction, which is beneficial for uniform heat distribution. Of course, in other embodiments, the heating wires 14 can also be arranged at intervals and connected in series sequentially.

[0062] In this embodiment, each heating wire 14 has a fixing part 13 connected to both ends of its long axis. The fixing part 13 extends longitudinally, that is, each fixing part 13 forms a Y-shaped structure with the first heating segment 11 and the second heating segment 12 connected to it, thereby improving the support strength of the heating part 10.

[0063] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0064] The above is a description of the technical solution provided by the present invention. For those skilled in the art, based on the ideas of the embodiments of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A heating element, said heating element being applied to an atomizer, wherein the heating element is clamped and fixed in the atomizer by an oil guide body and a support body in a vertical direction to form a heating assembly; characterized in that, The heating element is a flat sheet structure formed by etching a metal sheet, including a heating part, a connecting part extending from both ends of the heating part, and a conductive part extending from the connecting part away from the heating part; the heating part is used to heat and atomize the atomizing liquid absorbed in the oil guide body; the cross-sectional area of ​​the connecting part gradually increases from the end connected to the heating part to the end connected to the conductive part, and the maximum cross-sectional area of ​​the connecting part is smaller than the cross-sectional area of ​​the conductive part, and the minimum cross-sectional area of ​​the connecting part is larger than the cross-sectional area of ​​the heating section in the heating part; the heating part is connected to at least one fixing part on each of its two longitudinal sides.

2. The heating element as described in claim 1, characterized in that, The conductive part is circular, and the two opposite sides of the connecting part along the width direction are tangent to the conductive part.

3. The heating element as described in claim 1, characterized in that, At least one hollow hole is provided in the connecting part.

4. The heating element as described in claim 1, characterized in that, The thickness of the heating element is 0.05-0.2 mm.

5. The heating element as described in claim 1, characterized in that, The two conductive parts are located at both ends of the heating element in the transverse direction. The heating parts are grid-shaped, striped, S-shaped, zigzag, wavy, sawtooth, spiral, circular or rectangular.

6. The heating element as described in claim 5, characterized in that, The heating element is an S-shaped or continuously S-shaped heating wire, including a plurality of first heating segments. The plurality of first heating segments are arranged laterally at intervals and extend substantially longitudinally. One end of two adjacent first heating segments is connected together through a second heating segment, and the other end is separated from each other. The two free ends of the heating element are respectively connected to two connecting parts. The cross-sectional areas of the first heating segments and the second heating segments are the same and smaller than the minimum cross-sectional area of ​​the connecting parts.

7. The heating element as described in claim 5, characterized in that, The heating element is an S-shaped or continuously S-shaped heating wire, including a plurality of first heating segments. The plurality of first heating segments are arranged longitudinally at intervals and extend substantially laterally. One end of two adjacent first heating segments is connected together through a second heating segment, and the other end is separated from each other. The two free ends of the heating element are respectively connected to two connecting parts. The cross-sectional areas of the first heating segments and the second heating segments are the same and smaller than the minimum cross-sectional area of ​​the connecting parts.

8. The heating element as described in claim 5, characterized in that, The heating element includes a plurality of rectangular heating wires, which are spaced apart laterally and connected in series between the two connecting parts. Each heating wire includes two first heating segments that extend longitudinally and are parallel to each other. The two ends of the two first heating segments are respectively connected by a second heating segment. The cross-sectional areas of the first heating segments and the second heating segments are the same and smaller than the minimum cross-sectional area of ​​the connecting part.

9. The heating element according to any one of claims 6 to 8, characterized in that, Each of the second heating segments is connected to one of the fixing parts.

10. The heating element as described in claim 9, characterized in that, The fixing part extends longitudinally.

11. The heating element as described in claim 9, characterized in that, One portion of the fixing part extends obliquely along one end close to the heating element, and the other portion of the fixing part extends obliquely along the other end close to the heating element.

12. The heating element as described in claim 9, characterized in that, The second heating section is an arc shape that bulges outward from the center.

13. The heating element as described in claim 7, characterized in that, The connection between the connecting part and the first heating segment also extends to form a fixing part.

14. The heating element as described in claim 5, characterized in that, The heating element includes several diamond-shaped heating wires, which are connected in series in the transverse direction between two connecting parts; the cross-sectional area of ​​the heating wires is smaller than the minimum cross-sectional area of ​​the connecting part.

15. The heating element as described in claim 14, characterized in that, The short axis of the heating wires is arranged laterally, and the long axis is arranged longitudinally, with each of the heating wires having a fixing part connected to both ends of the long axis.

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