A heating element

Abstract

The application relates to a heating body, which is in a flat sheet structure and comprises a heating part and a conductive part extending along the transverse ends of the heating part, the heating part is divided into a first heating area in the middle and a second heating area on both sides of the first heating area along the transverse direction, and the interval between two adjacent heating sections in the first heating area is larger than that in the second heating area. The heating body can reduce the temperature of the first heating area in the middle, increase the temperature of the second heating area on both sides, reduce the temperature difference between the middle and both sides of the heating part, make the temperature of the whole heating part more uniform, improve the atomization effect of the heating body, and avoid the occurrence of the paste core caused by the excessively high local temperature.

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] The heating element used in current electronic atomizers typically consists of a regular heating wire and conductive sections at both ends of the heating wire. The spacing between the heating sections in the heating wire is equal, resulting in uneven heating during heating. That is, the heat is too concentrated in the middle of the heating wire, causing the temperature at the center of the heating wire to be high, while the temperature at the sides near the conductive sections is low. This can easily lead to problems such as carbon buildup and burnt coils in the center. 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, including a heating part and conductive parts extending laterally from both ends of the heating part. The heating part is divided laterally into a first heating region located in the middle and a second heating region located on both sides of the first heating region. The distance between two adjacent heating segments in the first heating region is greater than the distance between two adjacent heating segments in the second heating region.

[0005] Optionally, the heating element may be mesh-like, striped, S-shaped, zigzag-shaped, wavy, sawtooth-shaped, spiral-shaped, circular, or rectangular.

[0006] 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 laterally 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 conductive parts.

[0007] The distance between two adjacent first heating segments in the first heating region is D1, and the distance between two adjacent first heating segments in the second heating region is D2, where D1 is greater than D2.

[0008] Optionally, the heating element includes a plurality of rectangular heating wires, which are spaced apart laterally and connected in series between two conductive elements; 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 to each other through a second heating segment.

[0009] The distance between the two first heating segments of the heating wire in the first heating region is D3, and the distance between the two first heating segments of the heating wire in the second heating region is D4, where D3 is greater than D4.

[0010] Optionally, the spacing between two adjacent heating wires in the first heating region is D5, and the spacing between two adjacent heating wires in the second heating region is D6, where D5 is greater than D6.

[0011] Optionally, the cross-sectional area of ​​each of the first heating segments gradually decreases and extends from the middle to both ends of the longitudinal direction.

[0012] Optionally, the heating element is connected to at least one fixing part on each of its two longitudinal sides.

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

[0014] Optionally, the fixing portion extends longitudinally; or a portion of the fixing portion extends obliquely along one end close to the heating element, and another portion of the fixing portion extends obliquely along the other end close to the heating element.

[0015] Optionally, the second heating segment has an arc shape that bulges outward from the center.

[0016] Optionally, the heating element includes a plurality of rhomboid heating wires, which are connected in series in the transverse direction between two conductive elements;

[0017] Each of the heating wires has a diamond-shaped hole. The maximum horizontal spacing of the diamond-shaped holes of the heating wires in the first heating region is D7, and the maximum horizontal spacing of the diamond-shaped holes of the heating wires in the second heating region is D8, where D7 is greater than D8.

[0018] 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.

[0019] Optionally, the cross-sectional area of ​​the conductive part gradually increases from one end near the heating part to the other end, and the minimum cross-sectional area of ​​the conductive part is greater than the cross-sectional area of ​​the heating segment in the heating part.

[0020] Optionally, the end of the conductive part away from the heating part further extends to form an extension, the cross-sectional area of ​​which is smaller than the minimum cross-sectional area of ​​the conductive part.

[0021] Optionally, the heating element is a single piece formed from a metal sheet by etching.

[0022] Optionally, the thickness of the heating element is 0.05-0.2 mm.

[0023] Optionally, the conductive part near the heating part is further provided with at least one perforation.

[0024] According to the heating element of the present invention, by setting the spacing of the heating section in the middle of the heating part to be greater than the spacing of the heating sections on both sides, the temperature of the first heating area in the middle can be reduced, and the temperature of the second heating areas on both sides can be increased, thereby reducing the temperature difference between the temperature in the middle of the heating part and the temperature on both sides, so as to make the temperature of the entire heating part more uniform, improve the atomization effect of the heating element, and avoid the occurrence of core clogging due to excessive local temperature. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the heating element of the present invention;

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of the heating element during mass production;

[0028] Figure 3 for Figure 1 A schematic diagram of the actual assembly of the heating element shown;

[0029] Figure 4 for Figure 1 Alternative embodiments of the heating element shown;

[0030] Figure 5 for Figure 4 A schematic diagram of the actual assembly of the heating element shown;

[0031] Figure 6 This is a schematic diagram of another embodiment of the heating element of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of another embodiment of the heating element of the present invention;

[0033] Main component description:

[0034] 100. Heating element; 101. Etched area; 102. Frame area; 103. Connection point; 200. Atomizing base; 201. Atomizing chamber; 300. Support body; A. First heating area; B. Second heating area;

[0035] 10. Heating element; 11. First heating section; 12. Second heating section; 13. Fixing part; 14. Heating wire; 15. Connecting part;

[0036] 20. Conductive part; 21. Contact area; 30. Extension. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Please see Figure 1This invention provides a heating element 100, which has a flat, sheet-like structure. It includes a heating section 10 and conductive sections 20 extending laterally from both ends of the heating section 10. The heating section 10 is laterally divided into a first heating region A in the middle and second heating regions B on both sides of the first heating region A. The distance between two adjacent heating segments in the first heating region A is greater than the distance between two adjacent heating segments in the second heating region B. With this structure, when the heating element 100 is energized, the temperature of the first heating region A in the middle can be lowered, while the temperature of the second heating regions B on both sides can be raised, thereby reducing the temperature difference between the middle and sides of the heating section 10 and making the temperature of the entire heating section 10 more uniform. When this heating element 100 is applied to an atomizer with dual liquid inlet channels, the second heating regions B on both sides are located close to or correspond to the lower part of the two liquid inlet channels, which is more conducive to heating and atomizing the atomizing liquid in the oil guide body.

[0041] In practical applications, the heating element 100 is assembled into the atomizing component of the atomizer, and is attached to or embedded in the atomizing surface of the oil guide body in the atomizing component. The conductive part 20 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.

[0042] In this embodiment, the heating element 100 is a single piece formed from a metal sheet by etching. For example, conductive metals such as nickel sheets, nickel-chromium sheets, iron-chromium-aluminum sheets, stainless steel sheets, titanium sheets, or alloy sheets can be used. The material can be selected according to the actual situation. The thickness of the heating element 100 is 0.05-0.2 mm, preferably 0.1 mm. The heating portion 10 of the heating element 100 can be various shapes that provide relatively uniform heating, such as grid-like, striped, S-shaped, zigzag, wavy, sawtooth, spiral, circular, or rectangular.

[0043] Specifically, the heating element 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 laterally at intervals and extend substantially longitudinally. 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 conductive parts 20. The distance between two adjacent first heating segments 11 in the first heating region A is D1, and the distance between two adjacent first heating segments 11 in the second heating region B is D2, where D1 is greater than D2.

[0044] Thus, when the heating element 100 is energized and heats up, the distance between the two first heating segments 11 in the middle first heating region A of the heating part 10 is relatively large, which reduces the heat generated per unit area of ​​the first heating region A and lowers the temperature of the first heating region A; while the distance between the two first heating segments 11 in the second heating regions B on both sides is relatively small, which increases the heat generated per unit area of ​​the second heating region B and raises the temperature of the second heating region B. This reduces the temperature difference between the middle and the sides of the heating part 10, making the temperature distribution of the heating part 10 more uniform along the lateral direction, improving the atomization effect of the heating element 100, and avoiding the occurrence of core clogging due to excessively high local temperatures.

[0045] In this embodiment, the cross-sectional area of ​​the conductive part 20 gradually increases from one end near the heating part 10 to the other end, and the minimum cross-sectional area of ​​the conductive part 20 is greater than the cross-sectional area of ​​the heating segment in the heating part 10.

[0046] Specifically, the cross-sectional areas of the first heating segment 11 and the second heating segment 12 can be the same, that is, their widths are both d1 and smaller than the minimum width d2 of the conductive part 20. By limiting the gradual structure of the cross-sectional area of ​​the conductive part 20, while ensuring that the conductive part 20 has sufficient support strength for the heating part 10, the conductive part 20 does not heat up when the heating body 100 is energized. Furthermore, since the end of the conductive part 20 connected to the heating part 10 is the smaller end, the heat conduction from the heating part 10 to the conductive part 20 is reduced, so that the generated heat is concentrated in the area of ​​the heating part 10, resulting in better atomization and improved heat utilization efficiency.

[0047] To facilitate contact between the conductive part 20 and the electrode, the end of the conductive part 20 away from the heating part 10 is arc-shaped, thus forming a circular contact area 21 that matches the size of the electrode being contacted. This ensures the contact area between the conductive part 20 and the electrode, as well as the overall strength of the heating element 100. Preferably, the conductive part 20 may have at least one perforation outside the contact area 21 to further reduce heat conduction from the heating part 10 to the conductive part 20.

[0048] In this embodiment, an extension portion 30 is formed at the end of the conductive portion 20 away from the heating portion 10. The cross-sectional area of ​​the extension portion 30 is smaller than the minimum cross-sectional area of ​​the conductive portion 20. That is, the width d3 of the extension portion 30 is smaller than the minimum width d2 of the conductive portion 20.

[0049] In some embodiments, the cross-sectional area of ​​each first heating segment 11 can gradually decrease from the middle towards both ends in the longitudinal direction. That is, the width of the middle part of the first heating segment 11 is H1, and the width of both ends of the first heating segment 11 is H2, where H1 is greater than H2. With this structure, when the voltage applied to the conductive parts 20 at both ends of the heating element 100 remains unchanged, the power at the center of the first heating segment 11 is slightly reduced, while the power at both ends of the first heating segment 11 is slightly increased, making the temperature distribution along the longitudinal direction of the heating element 10 more uniform. Combined with the spacing of each first heating segment 11, this makes the overall temperature of the entire heating element 10 more uniform. In this embodiment, the width of the second heating segment 12 is the same as the width H2 at both ends of the first heating segment 11.

[0050] Combination Figure 2 As shown, in actual manufacturing, a large piece of metal sheet is selected and divided into etching areas 101, forming areas corresponding to the heating elements 100 formed by the etching areas 101, and border areas 102 surrounding each forming area and etching area 101. After the etching areas 101 are removed, each heating element 100 formed by the forming areas is connected to the border areas 102 through the extensions 30 at both ends. In this way, multiple heating elements 100 can be automatically cut from the metal sheet, realizing mass production.

[0051] Specifically, the frame area 102 has rectangular or triangular connection points 103 at the positions of each extension 30. The extension 30 is connected to the frame area 102 through the connection points 103, and the contact width between the extension 30 and the connection point 103 is greater than 0.15mm or less than 3mm, preferably 2mm. This reduces the cutting marks on the extension 30, and the cutting marks are located on the extension 30, so that the cutting marks avoid the contact area 21 that contacts the electrode, ensuring stable contact between the conductive part 20 and the electrode.

[0052] Furthermore, combined Figure 3 As 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 conductive 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.

[0053] Furthermore, the ends of the fixing parts 13 on both sides can protrude from the edge of the support body 300. By bending the protruding parts toward the support body 300, they can be 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. Of course, one or more hollow holes can be opened on the fixing parts 13 as needed to reduce the heat generated by the heating element 10 from being transferred to the support body 300.

[0054] Preferably, the second heating segment 12 has an arc shape that protrudes outward along the longitudinal direction in the middle, so as to improve the uniform distribution of heat in the longitudinal direction when the heating part 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 part 10. In other embodiments, the number of fixing parts 13 can also be selected as needed, for example, while ensuring the support strength for the heating part 10, a fixing part 13 can be provided at intervals of one second heating segment 12.

[0055] Figure 4 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.

[0056] Combination Figure 5 As shown, this embodiment targets an atomizer without a support structure 300, 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 support 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 support 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 support surface of the atomizing base 200. In this way, the top surface of the atomizing base 200 supports the conductive 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.

[0057] Please see Figure 6The 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 conductive 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.

[0058] Specifically, the distance between the two first heating segments 11 of the heating wire 14 in the first heating region A is D3, and the distance between the two first heating segments 11 of the heating wire 14 in the second heating region B is D4, where D3 is greater than D4. Thus, when the heating element 100 is energized and heats up, the larger distance between the two first heating segments 11 of the heating wire 14 in the first heating region A reduces the heat generated per unit area of ​​the first heating region A, thereby lowering the temperature of the first heating region A. Conversely, the smaller distance between the two first heating segments 11 of the heating wire 14 in the two second heating regions B increases the heat generated per unit area of ​​the second heating region B, thereby raising the temperature of the second heating region B. This reduces the temperature difference between the middle and sides of the heating part 10, making the temperature distribution of the heating part 10 more uniform along the lateral direction.

[0059] In this design, adjacent heating wires 14 are connected by a series connection 15, with both ends of the series connection 15 connected to the middle of the first heating segment 11 on the corresponding side of each of the two adjacent heating wires 14. This means that the straight line containing the series connection 15 divides the heating wires 14 into two symmetrical sections, with the upper and lower sections of each heating wire 14 connected in parallel, and the heating wires 14 connected in series. Furthermore, the smooth transition between the first heating segment 11 and the second heating segment 12 facilitates even heat distribution and prevents heat accumulation and splattering at sharp corners.

[0060] Furthermore, the distance between two adjacent heating wires 14 in the first heating region A is greater than the distance between two adjacent heating wires 14 in the second heating region B. That is, the length of the series section 15 in the first heating region A is D5, and the length of the series section 15 in the second heating region B is D6, and D5 is greater than D6. Thus, when the heating element 100 is energized and heats up, the temperature of the first heating region A is further finely adjusted to decrease, and the temperature of the second heating region B is finely adjusted to increase, so that the temperature in the middle of the heating part 10 tends to be similar to the temperature on both sides, and the temperature of the heating part 10 is more uniformly distributed in the transverse direction.

[0061] In this embodiment, the cross-sectional areas of the first heating segment 11 and the second heating segment 12 are the same, 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 conductive part 20, so that the conductive part 20 does not heat up when the heating body 100 is energized and heats up, and the heat generated when the heating body 100 heats up is concentrated in the area of ​​the heating part 10.

[0062] It should be noted that the cross-sectional area of ​​each first heating segment 11 in this embodiment can also adopt a gradual structure, that is, the width of the first heating segment 11 gradually shrinks from the middle to both ends, so that the temperature of the heating part 10 is more uniformly distributed along the longitudinal direction.

[0063] Preferably, the width of the series portion 15 in the first heating region A can be set to be greater than the width of the series portion 15 in the second heating region B, thereby further reducing the temperature at the center of the heating part 10 and promoting uniform temperature across the entire heating part 10.

[0064] 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 conductive parts 20. Each heating wire 14 has a rhomboid hole. The maximum transverse spacing of the rhomboid holes of the heating wires 14 in the first heating region A is D7, and the maximum transverse spacing of the rhomboid holes of the heating wires 14 in the second heating region B is D8. D7 is greater than D8.

[0065] When the heating element 100 is powered on, it reduces the heat generated per unit area of ​​the first heating region A, thus lowering the temperature of the first heating region A; while it increases the heat generated per unit area of ​​the second heating region B, thus raising the temperature of the second heating region B. This reduces the temperature difference between the middle and sides of the heating part 10, making the temperature distribution of the heating part 10 more uniform along the lateral direction.

[0066] Specifically, in this embodiment, 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 widths of the first heating segments 11 and the second heating segments 12 are d1, which is smaller than the minimum width d2 of the conductive part 20, so that the conductive part 20 does not heat up when the heating body 100 is energized, and the heat generated when the heating body 100 heats up is concentrated in the heating part 10 region.

[0067] 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 on the longitudinal centerline of the heating element 100, so 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.

[0068] 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.

[0069] Preferably, the cross-sectional area of ​​the first heating segment 11 and the second heating segment 12 in this embodiment can also be set with a gradual structure, that is, the width of the first heating segment 11 and the second heating segment 12 gradually decreases from the end away from the fixed part 13 to the end closer to the fixed part 13, thereby reducing the temperature of the heating part 10 at the transverse centerline position, so that the temperature of the heating part 10 along the longitudinal direction is more uniform.

[0070] 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.

[0071] 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, characterized in that, The heating element is a flat, sheet-like structure, including a heating section and conductive sections extending laterally from both ends of the heating section. The heating section is laterally divided into a first heating region in the middle and second heating regions on both sides of the first heating region. The distance between two adjacent heating segments in the first heating region is greater than the distance between two adjacent heating segments in the second heating region. The heating element is applied to an atomizer with dual liquid inlet channels. The second heating regions on both sides are located near or correspond to the lower part of the two liquid inlet channels to heat and atomize the atomized liquid in the oil guide body. The heating element is assembled into the atomization assembly of the atomizer, fitting or embedding on the atomization surface of the oil guide body in the atomization assembly. The conductive sections are electrically connected to the electrodes of the atomizer. The cross-sectional area of ​​the conductive section gradually increases from one end near the heating section to the other end, and the minimum cross-sectional area of ​​the conductive section is greater than the cross-sectional area of ​​the heating segment in the heating section. The conductive section also extends to the end away from the heating section, forming an extension section. The cross-sectional area of ​​the extension section is smaller than the minimum cross-sectional area of ​​the conductive section.

2. The heating element as described in claim 1, characterized in that, The heating element can be mesh-like, striped, S-shaped, zigzag-shaped, wavy, sawtooth-shaped, spiral, circular, or rectangular.

3. The heating element as described in claim 2, characterized in that, The heating element is a heating wire that is S-shaped or continuously S-shaped and includes several first heating segments. The several first heating segments are arranged laterally 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 conductive parts. The distance between two adjacent first heating segments in the first heating region is D1, and the distance between two adjacent first heating segments in the second heating region is D2, where D1 is greater than D2.

4. The heating element as described in claim 2, characterized in that, The heating element includes a plurality of rectangular heating wires, which are spaced apart laterally and connected in series between two conductive elements. 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 to each other through a second heating segment. The distance between the two first heating segments of the heating wire in the first heating region is D3, and the distance between the two first heating segments of the heating wire in the second heating region is D4, where D3 is greater than D4.

5. The heating element as described in claim 4, characterized in that, The distance between two adjacent heating wires in the first heating region is D5, and the distance between two adjacent heating wires in the second heating region is D6, where D5 is greater than D6.

6. The heating element according to any one of claims 3 to 5, characterized in that, The cross-sectional area of ​​each of the first heating sections gradually decreases and extends from the middle to both ends of the longitudinal direction.

7. The heating element according to any one of claims 3 to 5, characterized in that, The heating element is connected to at least one fixing part on each of its two longitudinal sides.

8. The heating element as described in claim 7, characterized in that, Each of the second heating segments is connected to one of the fixing parts.

9. The heating element as described in claim 7, characterized in that, The fixing part extends longitudinally; or 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.

10. The heating element as described in claim 7, characterized in that, The second heating section is an arc shape that bulges outward from the center.

11. The heating element as described in claim 2, characterized in that, The heating element includes several diamond-shaped heating wires, which are connected in series in the transverse direction between two conductive elements. Each of the heating wires has a diamond-shaped hole. The maximum horizontal spacing of the diamond-shaped holes of the heating wires in the first heating region is D7, and the maximum horizontal spacing of the diamond-shaped holes of the heating wires in the second heating region is D8, where D7 is greater than D8.

12. The heating element as claimed in claim 11, characterized in that, The short axis of each heating wire is arranged laterally, and the long axis is arranged longitudinally, with a fixing part connected to each end of the long axis of each heating wire.

13. The heating element as claimed in claim 1, characterized in that, The heating element is a single piece formed by etching a metal sheet.

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

15. The heating element as claimed in claim 1, characterized in that, The conductive part near the heating part also has at least one perforated hole.

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