Aerosol generator and its heat generating structure

Abstract

The present invention provides an aerosol generator and a heating structure. The heating structure includes a heating element and a tube through which infrared light waves are transmitted, with a gap between the heating element and the tube wall. The heating element includes a longitudinal heating section that radiates infrared light waves when energized and a conductive section for introducing electrical energy to the heating section, and the tube wall has a thickness of 0.1 mm to 1 mm. The beneficial effects are as follows: As much heat as possible is ensured in the form of infrared radiation to heat and atomize the aerosol-forming matrix, the heating section of the heating element does not cause excessive combustion of the aerosol-generating medium, and the preheating time at high temperatures is significantly reduced, resulting in a significantly improved consumer experience.

Description

[Technical Field]

[0001] The present invention relates to the technical field of non-combustion heating atomization, and more particularly to an aerosol generating device and its heat generating structure. [Background technology]

[0002] In the related art, an aerosol-generating device is an electronic device that heats, rather than burns, an aerosol-forming matrix (e.g., a solid matrix, such as a plant leaf product like tobacco). Generally, the aerosol-forming matrix is ​​typically atomized at temperatures below 350°C. A drawback of this heating method is that, because the heating element transfers heat to the aerosol-forming matrix directly or indirectly via a solid material, the operating temperature of the heating element must not be too high; otherwise, the aerosol-forming matrix will over-burn, adversely affecting the smoking experience of the aerosol-generating device. However, there has been little research on heating element operating temperatures above 400°C.

[0003] In addition, due to the low temperature of the heating element, the aerosol generator needs to be preheated for a long time before puffing. Currently, the preheating time for most commercially available products is more than 15 seconds, which has a significant impact on the consumer experience. Summary of the Invention [Problem to be solved by the invention]

[0004] The technical problem that the present invention aims to solve is 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, The device includes a heating element and a tube through which infrared light waves pass, with a gap between the heating element and the tube wall, the heating element including a longitudinal heating portion that radiates infrared light waves when energized, and a conductive portion for introducing electrical energy to the heating portion, and the tube wall has a thickness of 0.1 mm to 1 mm.

[0006] In some embodiments, the heat generating portion includes a heat generating base that generates heat when energized, and an infrared emitting layer provided on the outer surface of the heat generating base for emitting the infrared light waves.

[0007] In some embodiments, the tube is made of fused silica, ceramic, or diamond.

[0008] In some embodiments, the heating portion is formed by winding or bending a long or wire-shaped heating wire.

[0009] In some embodiments, the tube has a wall thickness ranging from 0.15 mm to 0.5 mm.

[0010] In some embodiments, the maximum operating temperature of the heating element ranges from 500°C to 1300°C.

[0011] In some embodiments, the maximum operating temperature of the heating element ranges from 800°C to 1100°C.

[0012] In some embodiments, the gap has a width of 0.05 mm to 0.8 mm.

[0013] In some embodiments, the gap has a spacing of 0.1 mm to 0.5 mm.

[0014] In some embodiments, the heating element is disposed inside the tube, and the gap is disposed between the heating element and an inner wall of the tube.

[0015] In some embodiments, the heat generating portion includes a first heat generating portion and a second heat generating portion electrically connected to each other; The first heat generating portion is wound around the outside of the second heat generating portion, and the gap is formed between the outer periphery of the first heat generating portion and the inner wall of the tube.

[0016] In some embodiments, the second heating portion is linear, The first heating portion includes at least one bent section.

[0017] In some embodiments, the tube includes a first sleeve and a second sleeve disposed around the outer periphery of the tube; a gap is provided between the first sleeve and the second sleeve, the gap being a receiving cavity for receiving the heating element; The heating element is provided on the outer periphery of the first sleeve, and the gap is formed between the heating element and the outer surface of the tube wall of the tube, the thickness of the tube wall is the thickness of the tube wall of the first sleeve, and a heating cavity is formed inside the first sleeve to heat the aerosol-forming matrix.

[0018] The present invention also provides an aerosol generating device comprising the heat generating structure described above. [Effects of the Invention]

[0019] The beneficial effects of the present invention are as follows: The heating element of the heating element of the present invention can emit infrared light waves when energized, which can penetrate the tube and reach the aerosol-forming matrix to heat it. When the maximum operating temperature of the heating element reaches 1000°C or higher (the operating temperature of conventional HNB heating elements is usually below 400°C), the aerosol-forming matrix does not overburn, significantly improving the smoking experience. It also significantly shortens the preheating time at high operating temperatures, significantly improving the consumer experience. Furthermore, since the tube wall thickness is between 0.1mm and 1mm, adjusting the tube wall thickness to change the distance between the heating element and the tube wall ensures that as much heat as possible is released in the form of infrared radiation to heat and atomize the aerosol-forming matrix. Furthermore, the heat conduction effect of the heating element can be reasonably controlled, thereby achieving uniform atomization of the entire aerosol-forming matrix. [Brief explanation of the drawings]

[0020] The present invention will now be further described with reference to the drawings and examples. [Figure 1] 1 is a schematic perspective structural diagram of an aerosol generating device according to some embodiments of the present invention. [Figure 2] FIG. 2 is a schematic perspective view of the heat generating structure of the aerosol generating device shown in FIG. [Figure 3] FIG. 3 is a schematic diagram of the heat generating structure shown in FIG. 2 in a disassembled state. [Figure 4] FIG. 2 is a curve diagram of temperature changes during operation of the heating element shown in FIG. [Figure 5] FIG. 10 is a schematic perspective view of a heat generating structure according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] 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.

[0022] In the description of the present invention, the orientations or positional relationships indicated by terms such as "longitudinal," "axial," "length," "width," "upper," "lower," "top," "bottom," "inner," and "outer" are based on the orientations shown in the drawings or the orientations or positional relationships that are always assumed when the product of the present invention is in use, and are intended to facilitate and simplify the description of the present invention. They do not indicate or imply that the device or element must have a specific orientation, or be configured or operate in a specific orientation, and therefore should not be construed as limiting the present invention.

[0023] Furthermore, the terms "first" and "second" are for descriptive purposes only and cannot be understood to indicate or imply relative importance or the number of technical features depicted. Thus, a feature qualified by "first" or "second" may explicitly or implicitly include at least one of that feature. In describing the present invention, "plurality" means at least two sections, e.g., two sections, three, etc., unless otherwise expressly specified.

[0024] In the present invention, unless otherwise expressly specified and limited, the terms "attach," "couple," "connect," "fixed," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection. They may also refer to a mechanical connection or an electrical connection. Unless otherwise expressly specified, they may refer to a direct connection, an indirect connection via an intermediate medium, an internal communication between two elements, or an interactive relationship between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art depending on the situation.

[0025] FIG. 1 shows an aerosol-generating device 1 according to some embodiments of the present invention, and an aerosol-forming matrix 2 removably attached to one end of the aerosol-generating device 1. In some embodiments, the aerosol-generating device 1 may be prismatic so that it can be easily held by a user. The aerosol-generating device 1 is inserted into the aerosol-generating device 1, and the aerosol-forming matrix 2 is baked and heated at a low temperature to release the aerosol extract contained in the aerosol-forming matrix 2 in a non-combustion state. The aerosol-generating device 1 has good atomization stability and an excellent mouthfeel. In some embodiments, the aerosol-generating matrix 2 may be cylindrical or a strand- or sheet-shaped solid material made from plant leaves and / or stems. An aromatic component may also be added to the solid material. It should be understood that the aerosol-generating device 1 is not limited to a prismatic shape, and in other embodiments, it may have other shapes, such as a cylindrical or elliptical cylinder.

[0026] In some embodiments, the aerosol-generating device 1 may include a heat-generating structure 10 and a housing 20 for receiving the heat-generating structure 10. In some embodiments, the heat-generating structure 10 may be cylindrical, and the aerosol-forming matrix 2 may be removably inserted therein to heat and bake the aerosol-forming matrix 2. In some embodiments, the aerosol-generating device 1 may further include a power supply assembly (not shown) disposed within the housing 20. The heat-generating structure 10 may be partially inserted within the aerosol-forming matrix, specifically, within the medium section of the aerosol-forming matrix, and may radiate heat when energized to heat the medium section of the aerosol-forming matrix and atomize it to generate an aerosol. In this embodiment, the thermal radiation may be thermal infrared radiation. The heat-generating structure 10 has the advantages of being easy to assemble, having a simple structure, high atomization efficiency, high stability, and a long service life. The power supply assembly is electrically connected to the heat-generating structure 10 and supplies power to the heat-generating structure 10.

[0027] 2 and 3, in some embodiments, the heat-generating structure 10 may include a tube 11 and a heating element 12. The tube 11 houses at least a portion of the heating element 12 and allows light waves to pass through to reach the aerosol-forming matrix 2. Specifically, in this embodiment, the tube 11 transmits infrared light waves, facilitating the heating of the aerosol-forming matrix 2 by infrared radiation from the heating element 12. Specifically, there is a gap between the heating element 12 and the tube 11. In an energized state, the heating element 12 rapidly heats up to 1000-1300°C in 1-3 seconds. The surface temperature of the tube 11 may be controlled to 350°C or less, and the atomization temperature of the entire aerosol-forming matrix 2 is controlled to 300-350°C, thereby enabling the aerosol-forming matrix 2 to be accurately atomized in the wavelength range of 2-5 μm. It further includes an insulating bushing 13, which is provided at the lower open end of the tube 11, and the conductive portion 122 of the heating element 12 passes through the insulating bushing 13, thereby insulating the two leads of the conductive portion 122 from each other.

[0028] In some embodiments, the tube 11 may be a quartz glass tube. It is to be understood that in other embodiments, the tube 11 is not limited to a quartz tube, but may be made of other window materials through which light waves can pass, such as infrared-transmitting glass, transparent ceramics, diamond, etc. Because the aerosol-forming matrix 2 absorbs a large amount of energy in the form of infrared radiation to atomize the aerosol-forming matrix 2, the tube 11 must be transparent to wavelengths mainly in the range of 2 to 5 μm. The tube 11 may be made of a material such as a quartz glass tube, transparent ceramics, or diamond, which allows the infrared radiation to radiate and penetrate the aerosol-forming matrix 2, achieving uniform heating. This is advantageous for maintaining a uniform temperature across the cross section of the aerosol-forming matrix 2 and improving the uniformity of atomization.

[0029] In some embodiments, the tube 11 may be hollow. Specifically, the tube 11 includes a tubular body 111 having a circular cross section and a tip structure 112 provided at one end of the tubular body 111. Of course, it is understood that in other embodiments, the cross section of the tubular body 111 is not limited to a circular shape. The tubular body 111 has a hollow structure with one open end. The tube 11 may be attached to a fixed base (not shown), specifically, the tube 11 may be partially inserted into the fixed base. The open end may be located within the fixed base. The tip structure 112 may be located at an end of the tubular body 111 away from the open end. The provision of the tip structure 112 makes it easier for at least a portion of the heat-generating structure 10 to be inserted into and removed from the aerosol-forming matrix 2. In this embodiment, the tube 11 defines a first cavity 113, which may be cylindrical and may be non-sealed. The first cavity 113 does not require vacuum or inert gas filling when the heating element 12 is installed therein. The open end of the tube 11 may also be sealed to further improve the smoking experience and extend the service life of the heating element. It should be understood that in other embodiments, the heating element 12 may be spaced apart from the outside circumference of the tube 11, and a second cavity may be defined within the tube 11 to accommodate the aerosol-forming matrix 2. In this embodiment, the tube 11 further includes a positioning portion 114, which is provided at the open portion of the tubular body 111 and extends from the radially outer side of the tubular body 111 to form a positioning flange that can be used to attach and position the tube 11 to a fixed base. In this embodiment, the positioning portion 114 may be integrally formed with the tubular body 111. Of course, it should be understood that in some other embodiments, the positioning portion 114 may be removably assembled to the tube 11 by fitting, screwing, or fastening. In this embodiment, there is a gap between the inner wall of the tube 11 and the heating element 12, and the gap is air-filled or vacuum-filled.The gap prevents direct contact between the tube 11 and the heating element 12.

[0030] By adjusting the tube wall thickness and the distance between the heating element 12 and the tube wall, the heating temperature of the aerosol-forming matrix 2 through the entire heat-generating structure 10 can be adjusted. At a given temperature, increasing the tube wall thickness tends to decrease the degree of overall radiation. Furthermore, as much heat as possible is applied to heat and atomize the aerosol-forming matrix 2 through infrared overall heating, thereby reducing the rate of heat conduction that gradually heats the entire matrix from the surface toward the interior, achieving the effect of uniformly atomizing the entire aerosol-forming matrix 2. Optionally, in some embodiments, the tube wall thickness of the tube 11 is 0.15 mm to 0.6 mm. Preferably, the tube wall thickness of the tube 11 is in the range of 0.15 mm to 0.5 mm. In some embodiments, as the distance between the heating element 12 and the tube wall increases, the temperature of the outer surface of the heat-generating structure 10 tends to gradually decrease. Preferably, in some embodiments, the distance between the tube wall of the tube 11 and the heating element 12 is 0.05 mm to 1 mm. Preferably, the distance between the tube wall of the tube 11 and the heating element 12 may be 0.1 mm to 0.5 mm.

[0031] The maximum operating temperature range of the heating element 12 may be 500°C to 1300°C, and preferably, 800°C to 1100°C. At this temperature, the aerosol-forming matrix 2 is preheated within a very short time, thereby ensuring increased puffing efficiency and improved mouthfeel for the user's first two aerosol puffs. Specifically, in the energized state, the heating element 12 heats up to 1000°C to 1300°C in 1 to 3 seconds, and during the stable heating phase, the temperature is controlled between 500°C and 800°C, and the heating time may be 3 to 6 minutes. It should be understood that in other embodiments, the maximum operating temperature range of the heating element 12 is not limited to two. Due to the presence of the gap, the surface temperature of the tube 11 may be controlled to 350°C or less, and the atomization temperature of the entire aerosol-forming matrix 2 is controlled to 300-350°C, thereby realizing accurate atomization of the aerosol-forming matrix 2 in the wavelength range of 2-5 μm.

[0032] Specifically, Figure 4 shows the temperature curve of the heating element 12 during operation in this embodiment. Here, the ordinate represents temperature, and the abscissa represents the number of sampling points. Approximately 15 points correspond to 1 second, and the peak corresponds to the preheating time, which lasts approximately 1 to 5 seconds (the preheating time can be adjusted to 1 to 15 seconds by controlling the output power, as needed, but in conventional technologies, it is usually longer than 5 seconds). In this solution, the preheating time is preferably 1 to 3 seconds. As shown in Figure 4, when the aerosol generator 1 is turned on, the heating element 12 heats up to 1000°C or higher in approximately 1 second, meaning that the first puff can be produced in approximately 2 seconds. This rapid temperature rise allows the heating medium to heat up quickly, shortening the holding time and significantly improving the consumer experience. Furthermore, despite such rapid temperature rise and temperatures as high as 800°C or even 1000°C or higher, the medium does not burn and the taste is not impaired; rather, the mouthfeel is improved. When the temperature reaches approximately 1200°C, reduce the output power (or voltage) to lower the temperature of the heating element to approximately 600°C, maintain that temperature or a small temperature pulse for 4-5 minutes, then turn off the power and puff. Regardless of whether it's the preheating stage or the stable output stage, the main heating method is infrared light waves, but the wavelength ranges of the infrared light waves corresponding to the high temperature stage and the stable output temperature are different, but they are all wavelength ranges that are easily absorbed by the matrix.

[0033] In some embodiments, the heating element 12 may be a single, longitudinally extending piece or may be wound as a generally helical heating portion 121. Specifically, the heating element 12 may be generally cylindrical or may be wound as a single helix, a double helix, an M-shaped structure, an N-shaped structure, or other shapes. Of course, it should be understood that in other embodiments, the heating element 12 is not limited to a single piece but may be two or more pieces. In some embodiments, the heating element 12 may be formed by winding or bending a long or wire-shaped heating wire and may include a longitudinal heating portion 121 that emits infrared light waves when energized and a conductive portion 122 that introduces electrical energy into the heating portion 121. In some embodiments, the heat generating portion 121 may include a first heat generating portion 1211 and a second heat generating portion 1212 electrically connected to each other. The first heat generating portion 1211 is wrapped around the outside of the second heat generating portion 1212, forming an air gap between the outer periphery of the first heat generating portion 121 and the inner wall of the tube. The second heat generating portion 1212 is linear, and the first heat generating portion 1211 includes at least one bent section. In some embodiments, the first heat generating portion 1211 may have other shapes, such as a linear, sheet-like, or tubular shape, and the second heat generating portion 1212 may have shapes such as a spiral, N-shape, or M-shape. In some embodiments, the heat generating element 12 includes a heat generating base that generates heat when energized and an infrared emitting layer. The heat generating base can generate heat when energized. The infrared emitting layer is provided on the outer surface of the heat generating base and is used to radiate the heat generated by the heat generating base. In this embodiment, the heat generating base and the infrared emitting layer are distributed concentrically in the cross section of the heat generating portion.

[0034] In this embodiment, the heat generating substrate may be cylindrical or linear as a whole. Specifically, the heat generating substrate may be a heating wire. Of course, it is understood that in some other embodiments, the heat generating substrate is not limited to a cylindrical shape and may be sheet-shaped, i.e., the heat generating substrate may be a heating sheet. The heat generating substrate includes a metal substrate having high-temperature oxidation resistance, and the metal substrate may be a metal wire. Specifically, the heat generating substrate 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 heat generating substrate may be 0.15 mm to 0.8 mm.

[0035] In this embodiment, the heating element 12 further includes an anti-oxidation layer, which is formed between the heating base and the infrared emitting layer. Specifically, the anti-oxidation layer may be an oxide film, and the heating base is subjected to high-temperature heat treatment to form a dense oxide film on its surface, which serves as the anti-oxidation layer. It is understood that in other embodiments, the anti-oxidation layer is not limited to an oxide film formed on the heating base itself, and may also be an anti-oxidation coating applied to the outer surface of the heating base. The formation of the anti-oxidation layer ensures that the heating base is not oxidized or is hardly oxidized when heated in an air environment, improving the stability of the heating base. This eliminates the need to evacuate the first containing cavity 113, fill it with an inert gas or a reducing gas, or seal the opening. This simplifies the assembly process of the entire heating structure 10 and reduces manufacturing costs. In this embodiment, the thickness of the anti-oxidation layer may be 1 μm to 150 μm. If the thickness of the anti-oxidation layer is less than 1 μm, the heating base is more susceptible to oxidation. If the thickness of the antioxidant layer is greater than 150 μm, the heat conduction between the heat-generating substrate and the infrared radiating layer is affected.

[0036] In this embodiment, the infrared emitting layer may be an infrared layer. The infrared layer may be formed on the side of the antioxidant layer away from the heat-generating substrate 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 emitting layer is not limited to an infrared layer. In other embodiments, the infrared emitting layer may be a composite infrared layer. In this embodiment, the infrared layer may be formed on the side of the antioxidant layer away from the heat-generating substrate by dip coating, spray coating, brush coating, or other methods. The thickness of the infrared emitting layer may be 10 μm to 300 μm. When the thickness of the infrared emitting layer is 10 μm to 300 μm, the thermal radiation effect is relatively good, and the atomization efficiency of the aerosol-forming matrix 2 and the mouthfeel of the atomized product are relatively good. Of course, it is understood that in other embodiments, the thickness of the infrared emitting layer is not limited to 10 μm to 300 μm.

[0037] In some embodiments, the heating element 12 further includes a bonding layer between the antioxidant layer and the infrared emitting layer, which is used to prevent localized damage to the heating base and further improve the bonding strength between the antioxidant layer and the infrared emitting layer. In some embodiments, the bonding material in the bonding layer may be glass powder, i.e., the bonding layer may be a glass powder layer.

[0038] In some embodiments, the insulating bushing 13 may be made of materials such as ceramic insulating material and PEEK high-temperature insulating material, and may include two fixing through-holes 131 provided in the insulating bushing 13, into which the conductive parts 122 of the first heating part 1211 and the second heating part 1212 are inserted.

[0039] In some embodiments, the heating structure 10 further includes a support rod, which is an insulating rod. The support rod may be partially inserted into the heating element 121, may be located at the center of the heating element 121, and may be insulated from the heating element 121, and may serve to support the heating element 121. The support rod supports the heating element, prevents the heating element 12 from being completely deformed when heated, and ensures a uniform gap between the heating element 12 and the tube 11, thereby ensuring a consistent temperature field. It should be understood that in other embodiments, other structures may be provided to support the heating element 121 instead of the support rod.

[0040] 5 shows a heat-generating structure 10a according to a second embodiment of the present invention, which differs from the first embodiment mainly in the following respects: the heat-generating structure 10a is not limited to being partially inserted into the aerosol-forming matrix to heat the aerosol-forming matrix, but in this embodiment, the heat-generating structure 10a is placed around the outer periphery of the medium section of the aerosol-forming matrix to heat the aerosol-forming matrix in a circumferential heating manner.

[0041] In some embodiments, the heating structure 10a may include a tube 11a and a heating element 12a. The heating element 12a and the tube wall of the tube 11a are at least partially spaced apart and are used to generate heat when energized, exciting an infrared layer of the heating element 12a to emit infrared light waves. The infrared light waves penetrate through the tube wall of the tube 11a into the aerosol-forming matrix, further heating the aerosol-forming matrix. Specifically, in some embodiments, the heating element 12a may include a heating portion 121a that emits infrared light when energized, and a conductive portion 122a provided at one end of the heating portion 121a for introducing electrical energy.

[0042] In some embodiments, the tube 11a includes a first sleeve 111a and a second sleeve 112a fitted over the outer periphery of the first sleeve 111a. The first sleeve 111a has a hollow structure with both ends penetrated. The first sleeve 111a may be cylindrical, and its inner diameter may be slightly larger than the outer diameter of the aerosol-forming matrix. A gap is provided between the first sleeve 111a and the second sleeve 112a, and this gap forms a cavity for fitting the heating element 12a. The axial length of the first sleeve 111a may be larger than the axial length of the second sleeve 112a. The second sleeve 112a may be fitted over the outer periphery of the first sleeve 111a. The second sleeve 112a may be cylindrical, and the radial dimension of the second sleeve 112a may be larger than the radial dimension of the first sleeve 111a. In some embodiments, the heating element 12a is wound around the outer periphery of the first sleeve 111a and spaced apart from the outer wall of the second sleeve 112a, thereby creating a predetermined temperature difference between the inner wall of the containing cavity and the heating element 12, thereby providing thermal insulation. A heating cavity for heating the aerosol-forming matrix is ​​formed inside the first sleeve 111a.

[0043] In some embodiments, the second sleeve 112a has a reflective layer on the inside thereof, which is used to reflect the heat generated by the heating element 12 and radiate it to the aerosol-forming matrix, thereby increasing the energy efficiency of heating. It can be understood that the first sleeve 111a and the second sleeve 112a are not limited to a cylindrical shape, but may have other shapes such as a rectangular cylindrical shape, an elliptical cylindrical shape, etc.

[0044] By adjusting the tube wall thickness and the spacing between the heating element 12a and the tube wall, the heating temperature of the aerosol-forming matrix through the entire heating structure 10a can be adjusted. At the same temperature, increasing the tube wall thickness tends to decrease the overall radiation level. Furthermore, the aerosol-forming matrix can be heated and atomized through infrared overall heating as much as possible, thereby reducing the rate of heat conduction, which gradually heats the entire matrix from the surface toward the interior, and achieving the effect of uniformly atomizing the entire aerosol-forming matrix. Optionally, in some embodiments, the tube wall thickness of the first sleeve 111a is 0.15 mm to 0.6 mm. Preferably, the tube wall thickness of the first sleeve 111a is in the range of 0.15 mm to 0.5 mm. In some embodiments, as the distance between the heating element 12a and the tube wall of the first sleeve 111a increases, the temperature of the outer surface of the heating structure 10a may tend to gradually decrease, and preferably, in some embodiments, the distance between the tube wall of the first sleeve 111a and the heating element 12a may be 0.05 mm to 1 mm. Preferably, the distance between the tube wall of the first sleeve 111a and the heating element 12a may be 0.1 mm to 0.5 mm.

[0045] In some embodiments, the second sleeve 112a may further include a fastening structure, which is used to fasten the heating element 12a.

[0046] 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 heating element; and a tube through which infrared light waves pass, wherein there is a gap between the heating element and a tube wall of the tube; the heating element comprises a longitudinal heating portion that radiates infrared light waves when energized, and a conductive portion for introducing electrical energy to the heating portion; and the thickness of the tube wall is 0.1 mm to 1 mm.

2. 2. The heat generating structure according to claim 1, wherein the heat generating portion includes 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 radiating the infrared light waves.

3. The heating structure of claim 1 , wherein the tube is made of quartz glass, ceramic, or diamond.

4. The heat generating structure according to claim 1 , wherein the heat generating portion is formed by winding or bending a long or wire-shaped heat generating wire.

5. 2. The heat generating structure according to claim 1, wherein the thickness of the wall of the tube is in the range of 0.15 mm to 0.5 mm.

6. 2. The heating structure according to claim 1, wherein the maximum operating temperature of the heating element is in the range of 500°C to 1300°C.

7. 7. The heating structure according to claim 6, wherein the maximum operating temperature of the heating element is in the range of 800°C to 1100°C.

8. 2. The heat generating structure according to claim 1, wherein the gap has a width of 0.05 mm to 0.8 mm.

9. 9. The heat generating structure according to claim 8, wherein the gap has a width of 0.1 mm to 0.5 mm.

10. The heat generating structure according to claim 1 , wherein the heat generating element is provided inside the tube, and the gap is provided between the heat generating element and an inner wall of the tube.

11. the heat generating portion includes a first heat generating portion and a second heat generating portion electrically connected to each other, The heating structure according to claim 10, wherein the first heating portion is wrapped around the outside of the second heating portion, and the gap is formed between an outer periphery of the first heating portion and an inner wall of a tube.

12. The second heat generating portion is linear, The heat generating structure of claim 11 , wherein the first heat generating portion includes at least one bent section.

13. The tube includes a first sleeve and a second sleeve that is fitted around the outer periphery of the tube, a gap is provided between the first sleeve and the second sleeve, the gap serving as a receiving cavity for receiving the heating element; The heating structure described in claim 1, characterized in that the heating element is provided on the outer periphery of the first sleeve, and the gap is formed between the heating element and the outer surface of the tube wall of the tube, the thickness of the tube wall is the thickness of the tube wall of the first sleeve, and a heating cavity for heating the aerosol-forming matrix is ​​formed inside the first sleeve.

14. An aerosol generating device, comprising: An aerosol generating device, comprising the heat generating structure according to any one of claims 1 to 13.

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