Aerosol generator and heat generating structure

Abstract

The present invention relates to an aerosol generator and a heat-generating structure, the heat-generating structure including a heat-generating portion and two conductive portions, the heat-generating portion having a spiral structure and formed by winding at least one heat-generating element, the heat-generating element including a heat-generating base that generates heat when energized and an infrared radiation layer provided on the outer surface of the heat-generating base for emitting infrared light waves, the heat-generating portion having a first end and a second end provided opposite the first end, the two conductive portions connected to the first end and the second end of the heat-generating portion, respectively, and extending in the same direction. By winding at least one heat-generating element to form a heat-generating portion having a spiral structure, the heat-generating structure improves the heat transfer efficiency of the heat-generating portion, improves the reliability of the entire heat-generating structure, makes it easier to maintain uniformity in the gap between the tube and the heat-generating portion, and maintains a uniform temperature field.

Description

[Technical Field]

[0001] The present invention relates to the technical field of non-combustion thermal atomization, and more particularly to aerosol generating devices and heat generating structures. [Background technology]

[0002] The HNB (heat-without-combustion) atomization technology generally employs heating methods such as central heating or peripheral heating, typically generating heat through the heating element, which is then transferred directly to a medium such as an aerosol-forming matrix via thermal conduction, with the medium typically atomized at temperatures below 350°C. The drawback of this heating method is that because the heating element transfers heat to the medium such as an aerosol-forming matrix directly or indirectly via a solid material, the operating temperature of the heating element must not be too high, otherwise the medium will burn excessively, adversely affecting the smoking experience of the e-cigarette.

[0003] The central heating structures disclosed in the related art generally have heating elements in the shape of elongated columns or flat sheets, and the operating temperature of the heating elements is generally around 400°C, which has relatively low thermal conductivity and limited impact on improving the smoking experience. No one has researched a heating structure with a maximum operating temperature exceeding 400°C. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to provide an improved aerosol generating device and heat generating structure. [Means for solving the problem]

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows: A heat generating structure including a heat generating part and two conductive parts, the heat generating part has a spiral structure and is formed by winding at least one heat generating element, the heat generating element includes a heat generating base that generates heat when electrically connected, and an infrared emitting layer provided on the outer surface of the heat generating base for emitting infrared light waves, the heat generating part has a first end and a second end provided opposite to the first end, and the two conductive parts are respectively connected to the first end and the second end of the heat generating part and extend along the same direction.

[0006] In some embodiments, the heating portion has a double helix structure.

[0007] In some embodiments, the heat generating portion includes a first heat generating portion and a second heat generating portion, one end of the first heat generating portion and one end of the second heat generating portion are connected and wound in a double spiral structure, The two conductive portions are connected to the other ends of the first heat generating portion and the second heat generating portion, respectively.

[0008] In some embodiments, the heat generating portion includes a plurality of spiral sections connected in series.

[0009] In some embodiments, each of the spiral sections of the heating element has an equal radial dimension.

[0010] In some embodiments, the plurality of spiral sections are not perfectly uniform or are completely unequal in radial dimension.

[0011] In some embodiments, the spiral sections are configured such that the radial dimensions of the spiral sections located at or near the center are greater than the radial dimensions of the spiral sections located at or near the ends.

[0012] In some embodiments, the spiral sections are configured such that the radial dimensions of the spiral sections located at or near the center are smaller than the radial dimensions of the spiral sections located at or near the ends.

[0013] In some embodiments, the plurality of spiral sections are evenly distributed.

[0014] In some embodiments, the plurality of spiral sections are distributed in an alternating pattern.

[0015] In some embodiments, the plurality of spiral sections are distributed in a sparse to dense fashion.

[0016] In some embodiments, the plurality of spiral sections are distributed in a dense to sparse fashion.

[0017] In some embodiments, the plurality of spiral sections are distributed in a sparse-dense-sparse fashion.

[0018] In some embodiments, the plurality of spiral sections are distributed in a dense-sparse-dense manner.

[0019] In some embodiments, the heating element is longitudinally disposed and bent to form the first and second heating portions.

[0020] In some embodiments, the heating element further includes a support rod, a portion of which is inserted through the heat generating portion and is insulated from the heat generating portion to support the heat generating portion.

[0021] In some embodiments, the device further includes a base, the tube is attached to the base, and both of the conductive portions pass through the base.

[0022] In some embodiments, the heating element further comprises a tube through which the infrared light waves generated by the heating portion are transmitted, the heating element being at least partially spaced from the tube.

[0023] In some embodiments, the tube is provided with a fixing structure for fixing the heat generating portion.

[0024] In some embodiments, the tube is hollow and defines a first cavity therein for receiving the heating element.

[0025] In some embodiments, the heating elements are spaced apart from one another around the circumference of a tube, the interior of the tube being hollow to define a second cavity for receiving the aerosol medium.

[0026] In some embodiments, the tube includes a first tube through which light waves are transmitted and a second tube that is fitted around the first tube; A gap is provided between the second tube and the first tube, and the gap serves as a first cavity for accommodating the heat generating portion, and a second cavity for heating the aerosol-forming substrate is formed inside the first tube.

[0027] In some embodiments, an air gap is provided between the heating element and the inner wall of the second tube and / or the outer wall of the first tube.

[0028] In some embodiments, there is a space between the entire heating element and the tube wall of the tube.

[0029] In some embodiments, the heating element is positioned so that it does not come into direct contact with the tube.

[0030] In some embodiments, the tube has a wall thickness of 0.15 mm to 0.6 mm.

[0031] In some embodiments, the distance between the tube wall and the heating element is between 0.05 mm and 1 mm.

[0032] The present invention also provides an aerosol generating device including the heat generating structure according to the present invention. [Effects of the Invention]

[0033] The aerosol generator and heat-generating structure according to the present invention have the following beneficial effects: The heat-generating structure has at least one heating element wound around it to form a heating part with a spiral structure, which improves the heat transfer efficiency of the heating part, improves the reliability of the entire heat-generating structure, and makes it easier to maintain uniformity in the gap between the tube and the heating part, thereby maintaining a uniform temperature field.

[0034] Furthermore, the two conductive parts are connected to the first and second ends of the heating part, respectively, and extend in the same direction, simplifying the assembly process of the entire heating structure. Furthermore, by providing an infrared emitting layer on the outer surface of the heating base, when the heating base generates heat while energized, the heat excites the infrared emitting layer, causing it to emit infrared light waves. The infrared light waves then pass through the tube to reach the aerosol-forming substrate, heating it. When the maximum operating temperature of the heating element reaches 1000°C or higher (the operating temperature of conventional HNB heating elements is typically below 400°C), the aerosol-forming medium is not excessively burned, significantly improving the smoking experience and significantly shortening the pre-heating time, significantly improving the consumer experience. [Brief explanation of the drawings]

[0035] The present invention will now be further described with reference to the following drawings and examples. [Figure 1] 1 is a structural schematic diagram of an aerosol generating device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a structural schematic diagram of the heat generating structure in the aerosol generating device shown in FIG. [Figure 3] FIG. 3 is a cross-sectional view of the heat generating structure shown in FIG. [Figure 4] FIG. 3 is a schematic exploded view of the heat generating structure shown in FIG. 2. [Figure 5]5 is a structural schematic diagram of a heat generating element of the heat generating structure shown in FIG. 4. [Figure 6] FIG. 6 is a cross-sectional view of the heating element shown in FIG. 5. [Figure 7] FIG. 10 is a structural schematic diagram of the heat generating structure of the aerosol generating device according to the second embodiment of the present invention. [Figure 8] FIG. 8 is a cross-sectional view of the heat generating structure shown in FIG. [Figure 9] FIG. 8 is a schematic diagram of the heat generating structure shown in FIG. 7 in a disassembled state. [Figure 10] FIG. 10 is a structural schematic diagram of the heat generating structure of the aerosol generating device according to the third embodiment of the present invention. [Figure 11] FIG. 11 is a cross-sectional view of the heat generating structure shown in FIG. [Figure 12] FIG. 11 is a schematic exploded view of the heat generating structure shown in FIG. [Figure 13] FIG. 10 is a schematic diagram showing a partial structure of the heat generating structure of the aerosol generating device according to the fourth embodiment of the present invention. [Figure 14] FIG. 10 is a schematic diagram showing a partial structure of the heat generating structure of the aerosol generating device according to the fifth embodiment of the present invention. [Figure 15] FIG. 10 is a structural schematic diagram of the heat generating structure of the aerosol generating device according to the sixth embodiment of the present invention. [Figure 16] FIG. 16 is a schematic view of the heat generating structure shown in FIG. 15 in a disassembled state. DETAILED DESCRIPTION OF THE INVENTION

[0036] In order to make the technical features, objects and effects of the present invention more clearly understandable, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0037] 1 shows a first embodiment of an aerosol-generating device according to the present invention. The aerosol-generating device 100 can heat an aerosol-forming substrate 200 by a non-combustion, low-temperature heating method, and has good atomization stability and an excellent mouthfeel for the atomized product. In some embodiments, the aerosol-forming substrate 200 is removably mounted in the aerosol-generating device 100. The aerosol-forming substrate 200 may be cylindrical, and more specifically, may be a strand- or sheet-shaped solid material made from plant leaves and / or stems, and an aromatic component may be further added to the solid material.

[0038] As shown in FIGS. 2 and 3 , the aerosol generating device 100 in this embodiment further includes a heat generating structure 11 and a power supply assembly 20. The heat generating structure 11 may be partially inserted into the aerosol-forming substrate 200. Specifically, the heat generating structure 11 is partially inserted into the medium section of the aerosol-forming substrate 200. When energized, the heat generating structure 11 generates infrared light waves to heat the medium section of the aerosol-forming substrate 200 and atomize it to generate an aerosol. The heat generating structure 11 has the advantages of a simple structure, high atomization efficiency, high stability, and a long service life. The power supply assembly 20 is used to supply power to the heat generating structure 11. Specifically, in some embodiments, the heat generating structure 11 is detachably mounted in the housing of the power supply assembly 20 and can be mechanically and / or electrically connected to a power source in the power supply assembly 20. The heat generating structure 11 is detachably mounted in the housing of the power supply assembly 20, which facilitates replacement of the heat generating structure 11.

[0039] 3 and 4, in this embodiment, the heat-generating structure 11 includes a tube 111, a heating element 112, and a base 113. The tube 111 covers at least a portion of the heating element 112 and allows light waves to pass through to reach the aerosol-forming substrate 200. Specifically, in this embodiment, the tube 111 transmits infrared light waves, facilitating heating of the aerosol-forming substrate 200 by thermal radiation from the heating element 112. Specifically, in this embodiment, an air gap is provided between the inner wall of the tube 111 and the heating element 112. In an energized state, the heating element rapidly heats up to about 1000°C within 1 to 3 seconds, the temperature of the surface of the tube 111 may be controlled to 350°C or less, and the atomization temperature of the entire aerosol-forming substrate is controlled to 300 to 350°C, thereby enabling accurate atomization of the aerosol-forming substrate mainly in the wavelength range of 2 to 5 μm. The base 113 is provided at the opening of the tube 111 and is used to mount the tube 111, and preferably also seals the opening of the tube 111. The maximum operating temperature of the heating element of the present invention is 500°C to 1300°C, which is far higher than the maximum operating temperature of heating elements in the prior art.

[0040] In this embodiment, the tube 111 may be a quartz glass tube. Of course, it can be understood that in some other embodiments, the tube 111 is not limited to a quartz tube, but may be other window materials through which light waves can pass, such as infrared-transmitting glass, transparent ceramics, diamond, etc.

[0041] In this embodiment, the tube 111 is hollow. Specifically, the tube 111 includes a tubular body 1111 having a circular cross section and a tip structure 1112 provided at one end of the tubular body 1111. Of course, it is understandable that in some other embodiments, the cross section of the tubular body 1111 is not limited to a circular shape. The tubular body 1111 has a hollow structure with one open end. The tip structure 1112 is provided at an end of the tubular body 1111 away from the opening. The provision of the tip structure 1112 makes it easier for at least a portion of the heat-generating structure 111 to be inserted into or removed from the aerosol-forming substrate 200. In this embodiment, a first containing cavity 1113 is formed inside the tube 111, and the first containing cavity 1113 is a cylindrical hollow. In some other embodiments, the heating element 112 may be spaced apart around the outer periphery of the tube 111, and a second placement cavity for placing the aerosol-forming substrate 200 may be formed inside the tube 111.

[0042] In this embodiment, the tube wall of the tube 111 is spaced apart from the entire heating element 112, and this space may be filled with air. Of course, it is understood that in some other embodiments, this space may be filled with a reducing gas. The space prevents direct contact between the tube 111 and the heating element 112.

[0043] As shown in FIGS. 5 and 6, in this embodiment, the heating element 112 may be a single piece disposed in the longitudinal direction and may be wound as a heating portion 1120 having a hollow spiral structure. Specifically, the heating element 112 may be cylindrical as a whole and may be wound as a double spiral structure. Of course, it is understood that in some other embodiments, the heating element 112 is not limited to a single piece, but may be two or more pieces. The shape of the heating element 112 is not limited to a cylindrical shape, and in some embodiments, the shape of the heating element 112 may be a sheet shape.

[0044] In this embodiment, the heat generating part 1120 is disposed inside the tube 111, spaced apart from the inner wall of the tube 111, and may emit infrared light waves when energized. Specifically, the infrared light waves can pass through the tube 111 and reach the aerosol-forming substrate 200.

[0045] In this embodiment, the heat generating portion 1120 includes a first heat generating portion 112a and a second heat generating portion 112b. One end of the first heat generating portion 112a is connected to one end of the second heat generating portion 112b. The first heat generating portion 112a and the second heat generating portion 112b are wound into a hollow double spiral structure. In this embodiment, the first heat generating portion 112a and the second heat generating portion 112b are integrally formed and can be formed by bending a single elongated heat generating element 112. It should be understood that in some other embodiments, the first heat generating portion 112a and the second heat generating portion 112b may be divided into separate structures, and each of the first heat generating portion 112a and the second heat generating portion 112b may be two heat generating elements 112. The hollow structure of the heating element 1120 reduces the risk of electrical conduction at the center, and also prevents localized underheating of the first and second heating elements 112a and 112b. Furthermore, the central heating element is not blocked by the outer heating elements, thereby improving heat transfer efficiency and heat utilization. Another advantage of the double spiral section is that it can ensure adequate resistance for rapid heating in a limited volume, making it particularly suitable for metal substrates.

[0046] In this embodiment, the heating element 1120 includes multiple spiral sections 112c, which are connected in series. In this embodiment, each spiral section 112c of the heating element 1120 is arranged to have the same radial dimension. In some embodiments, each spiral section 112c of the heating element 1120 has an incompletely uniform or completely unequal radial dimension. By adjusting the radial dimensions of the spiral sections 112c, the temperature field of the entire heating structure 11 can be set. In this embodiment, the diameter of the heating element 112 may be 0.05 to 0.7 mm. In some other embodiments, the radial dimensions of some of the spiral sections 112c may be larger than the radial dimensions of other parts of the spiral sections 112c, for example, the spiral sections 112c may be configured such that the radial dimension of a spiral section 112c located at or near the center is larger than the radial dimensions of a spiral section 112c located at or near both ends. Alternatively, the spiral sections 112c may be configured such that the radial dimension of a spiral section 112c located at or near the center is smaller than the radial dimensions of a spiral section 112c located at or near both ends.

[0047] In this embodiment, the spiral sections 112c are evenly spaced. It should be understood that in other embodiments, the spiral sections 112c are not limited to being evenly spaced, but may be alternately spaced, gradually spaced, gradually spaced, spaced, spaced, spaced, or spaced. In this embodiment, for a heating element made of the same material and having a uniform diameter, adjusting the spacing between the spiral sections 112c can control the overall temperature field distribution. Adjusting the pitch distribution can set the overall temperature field of the heating element 1120, thereby improving the heating stability and uniform atomization of the aerosol-forming substrate. The overall temperature field distribution is related to the density of the spiral sections 112c. The spiral sections 112c can be wound with different density levels depending on the temperature field distribution requirements and fuel conditions during the heating process of the entire aerosol-forming substrate.

[0048] Generally, the smaller the helical pitch, the more heat is generated per unit length, resulting in a higher temperature and stronger infrared radiation. However, since the heat dissipation area at both ends is larger than that at the center, the temperature is relatively lower at the same helical pitch. To achieve overall temperature uniformity, the pitch at both ends is small and the pitch at the center is large. However, a uniform temperature field does not necessarily optimize the atomization effect of the aerosol-forming substrate 200, and it is necessary to combine the effects of airflow and other factors. Therefore, the temperature field can be controlled by installing different helical structures.

[0049] Of course, it can be understood that in some other embodiments, the entire temperature field distribution can also be controlled by controlling the resistance, and the control of the resistance can be achieved by selecting the material of the heating element 112 or controlling different diameters, that is, the heating element 112 of the corresponding material and corresponding diameter can be selected as needed. In this embodiment, the resistivity is 0.8-1.6 Ωmm 2 / m.

[0050] In this embodiment, the heat generating portion 1120 further includes a first end 112d and a second end 112e. The first end 112d may be located opposite the second end 112e. The heat generating structure 11 further includes two conductive portions 1121. The two conductive portions 1121 are located at the first and second ends of the heat generating portion 1120, respectively, and are connected to the first and second heat generating portions 112a and 112b, respectively. The conductive portions 1121 extend in the same direction and are drawn out from the same end of the tube 111, penetrate the base 113, and are conductively connected to the power supply assembly 20. In this embodiment, the conductive portions 1121 may be fixedly formed by welding to the first and second heat generating portions 112a and 112b to form an integral structure. Of course, it is understood that in some other embodiments, the conductive portion 1121 may be integrally molded with the first heating portion 112a and / or the second heating portion 112b and formed by the same heating element 112. In this embodiment, the conductive portion 1121 may be a lead that can be welded to the first heating portion 112a and the second heating portion 112b. Of course, it is understood that in some other embodiments, the conductive portion 1121 is not limited to a lead and may have other conductive structures. The conductive portion 1121 is provided at one end of the heating portion 1120 and extends from the tube 111, which facilitates assembly of the entire heating structure 11 and simplifies the assembly process. To assemble, the heating structure 11 is attached to a holder and then contacted with an electrode in the holder. Of course, it is understood that in some other embodiments, the conductive portion 1121 is not limited to two and may be one.

[0051] In this embodiment, the heating element 112 includes a heating base 1122 and an infrared emitting layer 1124. The heating base 1122 is capable of generating heat when electrically connected. The infrared emitting layer 1124 is provided on the outer surface of the heating base 1122. When electrically connected and heated, the heating base 1122 excites the infrared emitting layer 1124 to generate and emit infrared waves. In this embodiment, the heating base 1122 and the infrared emitting layer 1124 are concentrically distributed in the cross section of the heating portion 1120.

[0052] In this embodiment, the heating base 1122 may be elongated overall and have a circular cross section. Specifically, the heating base 1122 may be a heating wire. Of course, it is understood that in some other embodiments, the heating base 1122 is not limited to a cylindrical shape and may be a sheet shape, i.e., the heating base 1122 may be a heating sheet. The heating base 1122 includes a metal substrate having high-temperature oxidation resistance, and the metal substrate may be a metal wire. Specifically, the heating base 1122 may be a metal material having properties such as good high-temperature oxidation resistance, high stability, and resistance to deformation, such as a nickel-chromium alloy substrate (e.g., nickel-chromium alloy wire) or an iron-chromium-aluminum alloy substrate (e.g., iron-chromium-aluminum alloy wire). In this embodiment, the radial dimension of the heating base 1122 may be 0.15 mm to 0.8 mm.

[0053] In this embodiment, the heating element 112 further includes an anti-oxidation layer 1123, which is formed between the heating base 1122 and the infrared emitting layer 1124. Specifically, the anti-oxidation layer 1123 may be an oxide film, and the heating base 1122 is subjected to a high-temperature heat treatment to form a dense oxide film on its surface, which becomes the anti-oxidation layer 1123. Of course, it should be understood that in some other embodiments, the anti-oxidation layer 1123 is not limited to an oxide film formed on the heating base itself, and in some other embodiments, it may be an anti-oxidation coating applied to the outer surface of the heating base 1122. The formation of the antioxidant layer 1123 ensures that the heating base 1122 is not oxidized or is hardly oxidized when heated in an air environment, improving the stability of the heating base 1122. This eliminates the need for vacuum suction or filling of reducing gas into the first containing cavity 1113, simplifying the assembly process of the entire heating structure 11, and reducing manufacturing costs. In this embodiment, the thickness of the antioxidant layer 1123 may be 1 μm to 150 μm. If the thickness of the antioxidant layer 1123 is less than 1 μm, the heating base 1122 is easily oxidized. If the thickness of the antioxidant layer 1123 is greater than 150 μm, the thermal conduction between the heating base 1122 and the infrared emitting layer 1124 will be affected.

[0054] In this embodiment, the infrared radiation layer 1124 may be an infrared layer. The infrared layer may be formed on the side of the antioxidant layer 1123 away from the heat-generating substrate 1122 by high-temperature heat treatment on an infrared layer-forming substrate. In this embodiment, the infrared layer-forming substrate may be a substrate made of silicon carbide, spinel, or a composite thereof. Of course, it is understood that in other embodiments, the infrared radiation layer 1124 is not limited to an infrared layer. In other embodiments, the infrared radiation layer 1124 may be a composite infrared layer. The composite infrared layer may be formed by combining the infrared layer-forming substrate with a binder for bonding to the antioxidant layer 1123. Specifically, the binder may be glass powder, and the composite infrared layer may be a glass powder composite infrared layer. In this embodiment, the infrared layer may be formed on the side of the antioxidant layer 1123 away from the heat-generating substrate 1122 by dip coating, spray coating, brush coating, or other methods. The thickness of the infrared radiation layer 1124 may be 10 μm to 300 μm, and when the thickness of the infrared radiation layer 1124 is 10 μm to 300 μm, the infrared light wave effect thereof is relatively good, and the atomization efficiency of the aerosol-forming substrate 200 and the mouthfeel of the atomized product are relatively good. Of course, it should be understood that in other embodiments, the thickness of the infrared radiation layer 1124 is not limited to 10 μm to 300 μm.

[0055] The heating element 112 further includes a bonding layer 1125 disposed between the anti-oxidation layer 1123 and the infrared emitting layer 1124, which can be used to prevent localized destruction of the heating base 1122 and further improve the bonding strength between the anti-oxidation layer 1123 and the infrared emitting layer 1124. In some embodiments, the bonding material in the bonding layer 1125 can be glass powder, i.e., the bonding layer 1125 can be a glass powder layer.

[0056] In this embodiment, the insulating structure may be provided on the entire outer wall of the heating element 112, i.e., on the outer walls of the first and second heating portions 112a and 112b. It is understood that the insulating structure may be provided only on the outer wall of the first or second heating portion 112a or 112b. By providing the insulating structure, the first and second heating portions 112a and 112b can be insulated from each other. In this embodiment, the insulating structure may be an air gap formed by vaporizing an insulating coating provided between the first and second heating portions 112a and 112b. In this embodiment, the insulating coating may be applied to the outer surface of the first and second heating portions 112a and 112b. It is understood that in some other embodiments, the insulating coating may be applied only on the outer surface of the first or second heating portion 112a or 112b. In some other embodiments, the insulating structure may be simply an insulating layer applied to the outer surface of the first heating portion 112a and / or the second heating portion 112b, and no evaporation process is required for the insulating layer.

[0057] In some embodiments, the insulating coating can be vaporized by high temperature, forming an air gap between the first heating portion 112a and the second heating portion 112b, thereby achieving insulation. In this embodiment, the insulating coating can be Teflon (registered trademark). Specifically, Teflon is applied to the entire outer surface of the heating element 112 and then tightly wound in a spiral shape, resulting in a Teflon coating between the first heating portion 112a and the second heating portion 112b with a thickness equivalent to the thickness of the two walls. After the heating portion 1120 is wound in a certain direction, the Teflon is vaporized by high temperature, thereby forming an air gap between the first heating portion 112a and the second heating portion 112b, thereby achieving insulation through the air gap.

[0058] It is understood that in some other embodiments, the insulating structure is not limited to an insulating coating. In some other embodiments, the insulating structure may be an insulating tube, which is placed around the outer periphery of the second heat-generating portion 112b to prevent direct contact between the second heat-generating portion 112b and the first heat-generating portion 112a, thereby preventing local conduction or breakdown. Of course, it is understood that the insulating tube may be placed around the outer periphery of the first heat-generating portion 112a, and the insulating tube may be a ceramic tube, a glass tube, or other high-temperature resistant insulating material.

[0059] In some embodiments, the oxide layer 1123 formed on the outer surface of the heat generating base 1122 of the first heat generating portion 112a and the second heat generating portion 112b by heat treating the outer surface of the heat generating portion 112a and the second heat generating portion 112b can enhance the insulation of the first heat generating portion 112a and the second heat generating portion 112b and protect the heat generating base 1122. That is, the insulating structure may include the oxide layer 1123.

[0060] 7 to 9 show a second embodiment of the aerosol generating device according to the present invention. The differences from the first embodiment are as follows: The heating structure further includes a support rod 114, which is an insulating rod. A portion of the support rod 114 may be inserted into the heating element 1120, or the support rod 114 may be located at the center of the heating element 1120 and insulated from the heating element 1120, and serve to support the heating element 1120. The support rod 114 may be cylindrical and inserted into and fixed to the base 113. The support rod 114 supports the heating element 1120, prevents the heating element 112 from being completely deformed by heat, and ensures a uniform gap between the heating element 112 and the tube 111, thereby ensuring a uniform temperature field. It should be understood that in some other embodiments, the support rod 114 may be omitted.

[0061] 10 to 12 show a third embodiment of the aerosol generating device according to the present invention, which differs from the first embodiment in the following respects: The tube 111 is provided with a fixing structure 115, which is used to fix the heat generating unit 1120. In this embodiment, the fixing structure 115 may be provided on the tip structure 1112, fixedly provided on the tip structure 1112, or detachably connected to the tip structure 1112. In this embodiment, the fixing structure 115 may be a hook provided at the bent portion of the heat generating element 112, thereby fixing the heat generating unit 1120 and equalizing the gap between the heat generating element 112 and the inner wall of the tube 111, thereby uniformizing the temperature field throughout the heat generating structure 111. Of course, it should be understood that in other embodiments, the fixing structure 115 is not limited to a hook, nor is it limited to being provided on the tip structure 1112. In this embodiment, the tip structure 1112 can be removably connected to the tubular body 1111, for example, by being fitted or threaded onto the tubular body 1111. Of course, in some other embodiments, the tip structure 1112 can be integrally formed with the tubular body 1111.

[0062] 13 shows a fourth embodiment of the aerosol generating device according to the present invention, which differs from the first embodiment in the following respects: In the heat generating part 1120, the multiple spiral sections 112c are configured such that the radial dimension of the spiral section 112c located at or near the center is larger than the radial dimension of the spiral sections 112c located at or near both ends, and the overall temperature field of the heat generating structure 11 can be set by adjusting the radial dimension of the spiral sections 112c.

[0063] 14 shows a fifth embodiment of the aerosol generating device according to the present invention, which differs from the first embodiment in the following respects: the plurality of spiral sections 112c are distributed gradually from dense to sparse, and the temperature field can be controlled by adjusting the spacing between the spiral sections 112c.

[0064] 15 and 16 show a sixth embodiment of the aerosol-generating device according to the present invention, which differs from the first embodiment in the following respects: the heat-generating structure 11 is not limited to being partially inserted into the aerosol-forming substrate 200 to heat the aerosol-forming substrate 200. In this embodiment, the heat-generating structure 11 is placed on the outer periphery of the medium section of the aerosol-forming substrate 200 and heats the aerosol-forming matrix in the aerosol-forming substrate 200 by circumferential heating. In this embodiment, the second heat-generating part 112b may be omitted.

[0065] In this embodiment, the tube 111 includes a first tube 111a and a second tube 111b. The first tube 111a has a hollow structure with both ends penetrated. The first tube 111a may be cylindrical, and its inner diameter may be slightly larger than the outer diameter of the aerosol-forming substrate 200. A second containment cavity 1114 for heating the medium section of the aerosol-forming substrate 200 is formed inside the first tube 111a. The axial length of the first tube 111a may be larger than the axial length of the second tube 111b. The second tube 111b may be fitted onto the outer periphery of the first tube 111a, and the second tube 111b may be cylindrical. The radial dimension of the second tube 111b may be larger than the radial dimension of the first tube 111a, i.e., a gap is provided between the second tube 111b and the first tube 111a, and this gap forms a first accommodation cavity 1113 for accommodating the heating element 112. In some embodiments, the heating element 112 is wound around the outer periphery of the first tube 111a, and an air gap 1115 is provided between the inner wall of the second tube 111b and the outer wall of the first tube 111a, thereby generating a certain temperature difference between the inner wall of the first accommodation cavity 1113 and the heating element 112, thereby providing thermal insulation. In some embodiments, a reflective layer may be provided on the inner wall of the second tube 111b, which is used to reflect heat from the heating element 112 and radiate it to the aerosol-forming substrate 200, thereby improving heating efficiency.

[0066] The above examples merely represent preferred embodiments of the present invention, and although the descriptions are relatively specific and detailed, it should be understood that this does not limit the scope of the present invention. Those skilled in the art can freely combine the above technical features and make slight modifications and improvements without departing from the concept of the present invention, all of which fall within the scope of protection of the present invention. Therefore, all conversions and modifications equivalent to the scope of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A heat generating structure, A heating structure comprising a heat generating portion (1120) and two conductive portions (1121), wherein the heat generating portion (1120) has a spiral structure and is formed by winding at least one heat generating element (112), wherein the heat generating element comprises a heat generating base (1122) that generates heat when electrically connected, and an infrared radiation layer provided on the outer surface of the heat generating base (1122) for radiating infrared light waves, wherein the heat generating portion (1120) comprises a first end (112d) and a second end (112e) provided opposite the first end (112d), and the two conductive portions (1121) are respectively connected to the first end (112d) and second end (112e) of the heat generating portion (1120) and extend along the same direction.

2. The heating structure according to claim 1, wherein the heating portion (1120) has a double spiral structure.

3. The heat generating portion (1120) includes a first heat generating portion (112a) and a second heat generating portion (112b), one end of the first heat generating portion (112a) and one end of the second heat generating portion (112b) are connected and wound in a double spiral structure, The heat generating structure according to claim 1, characterized in that the two conductive portions (1121) are connected to the other ends of the first heat generating portion (112a) and the second heat generating portion (112b), respectively.

4. The heat generating structure according to claim 1 , wherein the heat generating portion (1120) includes a plurality of spiral sections (112c) connected in series.

5. The heating structure of claim 4, wherein each of the spiral sections (112c) of the heating portion (1120) has equal radial dimensions.

6. 5. The heat generating structure of claim 4, wherein the plurality of spiral sections (112c) are not perfectly uniform or are completely unequal in radial dimension.

7. 7. The heat generating structure of claim 6, wherein the plurality of spiral sections are configured such that a radial dimension of the spiral section located at or near the center is greater than a radial dimension of the spiral section located at or near both ends.

8. 7. The heat generating structure of claim 6, wherein the plurality of spiral sections are configured such that a radial dimension of the spiral section located at or near the center is smaller than a radial dimension of the spiral section located at or near both ends.

9. The heat generating structure according to claim 4, wherein the plurality of spiral sections (112c) are equally spaced apart.

10. The heat generating structure according to claim 4, wherein the plurality of spiral sections (112c) are distributed alternately in a dense and sparse manner.

11. The heat generating structure according to claim 4, wherein the plurality of spiral sections (112c) are distributed gradually from sparse to dense.

12. The heat generating structure according to claim 4, wherein the plurality of spiral sections (112c) are distributed in a gradual manner from dense to sparse.

13. The heat generating structure according to claim 4, wherein the plurality of spiral sections (112c) are distributed in a sparse-dense-sparse manner.

14. The heat generating structure according to claim 4, wherein the plurality of spiral sections (112c) are distributed in a dense-sparse-dense manner.

15. 2. The heating structure according to claim 1, wherein the heating element (112) is provided in a longitudinal direction and is bent to form a first heating portion (112a) and a second heating portion (112b).

16. The heating structure of claim 1, further comprising a support rod (114), a portion of which is inserted through the heat generating portion (1120) and is insulated from the heat generating portion (1120) to support the heat generating portion (1120).

17. The heat generating structure according to claim 1, further comprising a base (113), wherein the two conductive portions (1121) both penetrate the base (113).

18. The heating structure of claim 1, further comprising a tube (111) through which the infrared light waves generated in the heating portion (1120) pass, and the heating element (112) is at least partially spaced from the tube (111).

19. The heat generating structure according to claim 18, characterized in that the tube (111) is provided with a fixing structure (115) for fixing the heat generating portion (1120).

20. The heating structure according to claim 18, characterized in that the tube (111) is hollow and has a first receiving cavity (1113) formed therein for receiving the heating element (112).

21. The heating structure of claim 18, characterized in that the heating elements (112) are spaced apart from one another around the outer periphery of a tube (111), and the interior of the tube (111) is hollow, forming a second storage cavity (1114) for storing an aerosol medium.

22. The tube (111) includes a first tube (111a) through which light waves pass and a second tube (111b) that is fitted around the outer periphery of the first tube (111a), The heating structure described in claim 18, characterized in that a gap is provided between the second tube (111b) and the first tube (111a), the gap forming a first cavity (1111) for accommodating the heating portion (1120), and a second cavity (1114) for heating an aerosol-forming substrate is formed inside the first tube (111a).

23. The heating structure of claim 22, characterized in that an air gap (1115) is provided between at least a portion of the heating element (112) and the inner wall of the second tube (111b) and / or the outer wall of the first tube (111a).

24. 19. The heating structure according to claim 18, wherein a gap is provided between the entire heating element (112) and the tube wall of the tube (111).

25. The heating structure according to claim 18, characterized in that the heating element (112) and the tube (111) are installed so as not to be in direct contact with each other.

26. The heat generating structure according to claim 18, wherein the tube (111) has a wall thickness of 0.15 mm to 0.6 mm.

27. The heating structure according to claim 18, wherein the gap between the tube wall of the tube (111) and the heating element (12) is 0.05 mm to 1 mm.

28. An aerosol generating device, comprising: An aerosol generating device, characterized in that it comprises a heat generating structure (11) according to any one of claims 1 to 27.

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