Heating tube and aerosol generation device
The heating tube design addresses mouth burning and cost issues by controlling temperature rise rates through distinct sections and electrode configurations, ensuring efficient aerosol production in heat-not-burn products.
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- SHENZHEN FIRST UNION TECH CO LTD
- Filing Date
- 2024-07-11
- Publication Date
- 2026-04-22
AI Technical Summary
Existing heat-not-burn products face issues such as mouth burning in the first few puffs due to complex structures, high costs, and the need for additional electrodes and complex control circuits.
A heating tube design with a base body having distinct sections and electrodes, including a first and second section with different temperature rise rates, achieved through varying lengths and configurations of conductive film layers and electrodes, allowing for controlled heat generation.
The design ensures quick heating of tobacco at the top section for initial aerosol production while slowing down heating at the middle-lower section, reducing mouth burning and maintaining consistent aerosol production.
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Abstract
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to Chinese Patent Application No. 202310871812.2, filed with the China National Intellectual Property Administration on July 17, 2023 and entitled "HEATING TUBE AND AEROSOL GENERATING DEVICE", which is incorporated herein by reference in its entirety.TECHNICAL FIELD
[0002] This application relates to the field of heat-not-burn aerosol generating technologies, and in particular, to a heating tube and an aerosol generating device.BACKGROUND
[0003] During use of smoking products such as cigarettes or cigars, tobacco is burnt to produce smoke. Attempts have been made to replace these tobacco-burning products by making products that release compounds without burning. An example of such products is a so-called heat-not-burn product, which releases compounds by heating tobacco instead of burning the tobacco.
[0004] A heating tube of an existing heat-not-burn product often burns the mouth in the first few puffs. Although there may be some techniques of controlling a heating temperature to solve the problem that the mouth is burned in the first few puffs, the structure is complex, and an external electrode needs to be additionally added, so that the costs are high. Meanwhile, a control circuit and a control logic are also complex, resulting in high costs.SUMMARY
[0005] An embodiment of this application provides a heating tube and an aerosol generating device.
[0006] In one aspect, this application provides a heating tube, including: a base body in which an accommodation cavity for accommodating at least part of an aerosol generating product is defined, where aerosols generated after the aerosol generating product is heated flow out from a top end of the base body; the base body at least includes a first section and a second section that are adjacent to each other in an axial direction; the first section is close to the top end of the base body; a conductive film layer arranged on at least part of a surface of the base body; a first electrode including a first longitudinal electrode disposed in an axial direction of the base body, and at least one first transverse electrode, where each first transverse electrode extends from the first longitudinal electrode in a circumferential direction of the base body; and a second electrode including a second longitudinal electrode disposed in an axial direction of the base body, and at least one second transverse electrode, where each second transverse electrode extends from the second longitudinal electrode in the circumferential direction of the base body; each first transverse electrode and each second transverse electrode that are adjacent to each other are electrically connected to the conductive film layer between the first transverse electrode and the second transverse electrode, to form a heating section; and a temperature rise rate of the first section is greater than a temperature rise rate of the second section.
[0007] In some embodiments, the first section includes a first heating section; the second section includes a second heating section; and current of the first heating section and current of the second heating section both flow through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the first heating section and the second heating section generate heat.
[0008] In some embodiments, a length L1 of the first heating section in the axial direction is less than a length L2 of the second heating section in the axial direction.
[0009] In some embodiments, L2 is 1.5 to 2 times L1.
[0010] In some embodiments, the length of the first heating section in the axial direction is 5-15 mm.
[0011] In some embodiments, each first transverse electrode or each second transverse electrode arranged between the first heating section and the second heating section is a common electrode, and the common electrode is separately connected to a conductive film layer of the first heating section and a conductive film layer of the second heating section; or each first transverse electrode and each second transverse electrode that are arranged between the first heating section and the second heating section are spaced apart from each other, to insulate the first transverse electrode from the second transverse electrode.
[0012] In some embodiments, the base body further includes a third section adjacent to the second section; and the third section includes a third heating section; current of the third heating section flows through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the third heating section generates heat.
[0013] In some embodiments, a relationship of the length L1 of the first heating section in the axial direction, the length L2 of the second heating section in the axial direction, and the length L3 of the third heating section in the axial direction is as follows: L1<L3<L2.
[0014] In some embodiments, the first section includes a first heating section; current of the first heating section flows through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the first heating section generates heat; one of each first transverse electrode and each second transverse electrode of the first heating section is a wide electrode, and the other one is a narrow electrode; and the wide electrode is disposed in the second section. (The wide electrode and the narrow electrode here are not specified here. To avoid complexity in the claims, they are specifically explained in the specification)
[0015] In some embodiments, the base body further includes a third section adjacent to the second section; the third section includes a third heating section; and the wide electrode is a common electrode between the first heating section and the third heating section.
[0016] In some embodiments, a length of the wide electrode in the axial direction is 2-10 mm.
[0017] In some embodiments, the conductive film layer is continuously arranged in the axial direction.
[0018] In some embodiments, the first section includes a first heating section; current of the first heating section flows through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the first heating section generates heat; and the second section is not provided with the conductive film layer.
[0019] In some embodiments, the first section includes a first heating section; current of the first heating section flows through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the first heating section generates heat; the conductive film layer is not continuously arranged in the axial direction; and the second section is a spacing region of the conductive film layer.
[0020] In some embodiments, each first transverse electrode and each second transverse electrode are alternately arranged in the axial direction.
[0021] In some embodiments, the first section includes a first heating section; current of the first heating section flows through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the first heating section generates heat; the second section is provided with a conductive film layer and two first transverse electrodes or two second transverse electrodes; and the conductive film layer is connected to the two first transverse electrodes or the two second transverse electrodes.
[0022] In some embodiments, the base body further includes a third section adjacent to the second section; and the third section includes a third heating section; current of the third heating section flows through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the third heating section generates heat.
[0023] In some embodiments, starting from the top end of the base body, each first transverse electrode and each second transverse electrode are sequentially arranged in the axial direction as follows: a first transverse electrode, a second transverse electrode, a second transverse electrode, and a first transverse electrode; or a second transverse electrode, a first transverse electrode, a first transverse electrode, and a second transverse electrode.
[0024] In some embodiments, the conductive film layer is continuously arranged in the axial direction.
[0025] In some embodiments, the first longitudinal electrode and the second longitudinal electrode are spaced apart from the conductive film layer to insulate the first longitudinal electrode and the second longitudinal electrode from the conductive film layer.
[0026] In some embodiments, the first longitudinal electrode and the second longitudinal electrode are respectively arranged at two bisecting points in the circumferential direction of the base body.
[0027] In some embodiments, lengths of the first longitudinal electrode and the second longitudinal electrode in the circumferential direction are 1-5 mm; or, lengths of each first transverse electrode and each second transverse electrode in the axial direction are 0.5-2 mm; or, a length of a gap between each longitudinal electrode and the conductive film layer in the circumferential direction is 0.2-2 mm.
[0028] A heating tube includes: a base body in which an accommodation cavity for accommodating at least part of an aerosol generating product is defined, where aerosols generated after the aerosol generating product is heated flow out from a top end of the base body; the base body at least includes a first section and a second section that are adjacent to each other in an axial direction; the first section is close to the top end of the base body; a plurality of heating sections are disposed on the base body in the axial direction; and conductive film layers arranged in the heating sections, where current of the conductive film layers flow in the axial direction to cause the heating sections to generate heat; and a temperature of a temperature field of the first section is greater than a temperature of a temperature field of the second section.
[0029] An aerosol generating device includes the heating tube, and further includes a power supply for supplying power to the heating tube.
[0030] In the above heating tube, through the arrangement of the first electrode and the second electrode, in particular the arrangement between each first transverse electrode, as well as each second transverse electrode, and the heating sections, the resistance of the heating sections in the heating tube is reduced, and the temperature rise rates of the heating sections are increased. Furthermore, the temperature rise rate of the first section close to the top end of the base body is set to be greater than the temperature rise rate of the second section. Therefore, in the early stage of a heating phase, the temperature rise of an upper section of the heating tube is greater than that of a middle-lower section. After a cigarette is plugged, cut tobaccos close to the upper section of the heating tube can quickly reach an atomization temperature, to ensure a volume of aerosols inhaled in the first few puffs. Cut tobaccos close to the middle-lower section are heated slowly, which can effectively slow down formation and upward diffusion of water vapor in the cut tobaccos close to the middle-lower section, and reduce a temperature of the aerosols inhaled in the first few puffs.BRIEF DESCRIPTION OF THE DRAWINGS
[0031] One or more embodiments are exemplarily described with reference to the corresponding figures in the accompanying drawings, and the descriptions are not to be construed as limiting the embodiments. Elements in the accompanying drawings that have same reference numerals are represented as similar elements, and unless otherwise particularly stated, the figures in the accompanying drawings are not drawn to scale. FIG. 1 is a schematic structural diagram of a heating tube according to an embodiment of this application; FIG. 2 is a schematic structural diagram of a structure shown in FIG. 1, viewed in another angle; FIG. 3 is a schematic structural diagram of a heating tube according to an embodiment of this application; FIG. 4 is a schematic structural diagram of a structure shown in FIG. 3, viewed in another angle; FIG. 5 is a schematic structural diagram of a heating tube according to an embodiment of this application; FIG. 6 is a schematic structural diagram of a structure shown in FIG. 5, viewed in another angle; FIG. 7 is a schematic structural diagram of a heating tube according to an embodiment of this application; FIG. 8 is a schematic structural diagram of a structure shown in FIG. 7, viewed in another angle; and FIG. 9 is a schematic structural diagram of an aerosol generating device according to an embodiment of this application.
[0032] In the drawings: 100: heating tube; 101: aerosol generating product; 110: base body; 111: accommodation cavity; 112: first section; 113: second section; 114: third section; 115: fourth section; 116: fifth section; 1121: first heating section; 1131: second heating section; 1141: third heating section; 120: first electrode; 121: first longitudinal electrode; 122: first transverse electrode; 130: second electrode; 131: second longitudinal electrode; 132: second transverse electrode; 140: conductive film layer; 10: aerosol generating device; and 200: power supply. DETAILED DESCRIPTION
[0033] To facilitate the understanding of this application, this application is described in more detail below with reference to accompanying drawings and specific implementations. The embodiments described herein are merely for the purpose of explaining the present disclosure but not limiting the present disclosure. In addition, it should also be noted that for convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
[0034] An embodiment of this application provides a heating tube. As shown in FIG. 1 and FIG. 2, the heating tube 100 includes a base body 110, a first electrode 120, a second electrode 130, and a conductive film layer 140. The base body 110 is approximately cylindrical, in which an accommodation cavity 111 is defined. The accommodation cavity 111 is configured to accommodate at least part of an aerosol generating product 101 (see FIG. 9). The aerosol generating product 101 is a substrate capable of releasing a volatile compound that can form aerosols, such as cigarettes. The conductive film layer 140 is arranged on at least part of a surface of the base body.
[0035] In conjunction with FIG. 1 and FIG. 9, the aerosols generated after the aerosol generating product 101 is heated flow out from a top end of the base body 110. As shown in FIG. 1, the base body 110 at least includes a first section 112 and a second section 113 that are adjacent to each other in an axial direction. The first section 112 is close to the top end of the base body 110, and the second section 113 is located below the first section 112 in the axial direction and is adjacent to the first section 112.
[0036] As shown in FIG. 1, the first electrode 120 includes a first longitudinal electrode 121 and at least one first transverse electrode 122. The first longitudinal electrode 121 is arranged in the axial direction of the base body 110. Each first transverse electrode 122 extends from the first longitudinal electrode 121 in a circumferential direction of the base body 110.
[0037] As shown in FIG. 2, the second electrode 130 includes a second longitudinal electrode 131 and at least one second transverse electrode 132. The second longitudinal electrode 131 is arranged in the axial direction of the base body 110, and each second transverse electrode 132 extends from the second longitudinal electrode 131 in the circumferential direction of the base body 110.
[0038] As shown in FIG. 1 and FIG. 2, each first transverse electrode 122 and each second transverse electrode 132 that are adjacent to each other are electrically connected to the conductive film layer 140 between the first transverse electrode and the second transverse electrode, to form a heating section.
[0039] In this embodiment of this application, a temperature rise rate of the first section 112 is greater than a temperature rise rate of the second section 113. Thus, in the early stage of a heating phase, the temperature rise of an upper section of the heating tube 100 is greater than that of a middle-lower section. After a cigarette is plugged, cut tobaccos close to the upper section of the heating tube 100 can quickly reach an atomization temperature, to ensure a volume of aerosols inhaled in the first few puffs. Cut tobaccos close to the middle-lower section are heated slowly, which can effectively slow down formation and upward diffusion of water vapor in the cut tobaccos close to the middle-lower section, and reduce a temperature of the aerosols inhaled in the first few puffs. In the middle and later stages of the heating phase, due to a heat conduction effect of the heating tube 100 itself, temperatures of the sections of the entire heating tube 100 gradually tend to be consistent, to provide a user with continuous aerosols and aroma.
[0040] Meanwhile, since the first electrode 120 and the second electrode 130 are configured as cross electrode structures including the longitudinal electrodes and the transverse electrodes, the heating tube 100 achieves different controls on the temperature rise rates of the sections through the cross electrode structures. The structure is simple, and the costs are low.
[0041] Specifically, there are many methods for implementing the temperature rise rate of the first section 112 that is greater than the temperature rise rate of the second section 113. For example, the temperature rise rate is controlled by changing an axial length of the conductive film layer 140 in each section, or by not providing the conductive film layer 140 in a section, requiring a smaller temperature rise rate, to prevent this section from generating heat, or by changing a width of an electrode in each section. The following text provides a detailed introduction to the methods.
[0042] It can be understood that the conductive film layer 140 can employ an infrared electrothermal film layer, such as an infrared electrothermal coating. The infrared electrothermal coating can generate thermal energy when energized, thus generating infrared rays with a wavelength. When the wavelength of the infrared rays matches an absorption wavelength of an aerosol generating substrate, energy of the infrared rays is easily absorbed by the aerosol generating substrate. In this implementation of this application, the wavelength of the infrared rays is not limited and can range from 0.75 µm to 1000 µm. Optionally, the infrared rays are far infrared rays with a wavelength ranging from 1.5 µm to 400 µm. The infrared electrothermal coating is optionally formed by fully and uniformly stirring far-infrared electrothermal ink, ceramic powder, and an inorganic binder, printing the mixture on an outer surface of the base body, and then performing drying and curing for a period of time. A thickness of the infrared electrothermal coating is 30 µm to 50 µm. Certainly, the infrared electrothermal coating can be formed by mixing and stirring tin tetrachloride, tin oxide, antimony trichloride, titanium tetrachloride, and anhydrous copper sulfate in a proportion and coated on the outer surface of the base body. Or, the infrared electrothermal coating may be one of a silicon carbide ceramic layer, a carbon fiber composite layer, a zirconium-titanium oxide ceramic layer, a zirconium-titanium nitride ceramic layer, a zirconium-titanium boride ceramic layer, a zirconium-titanium carbide ceramic layer, a ferric oxide ceramic layer, a ferric nitride ceramic layer, a ferric boride ceramic layer, a ferric carbide ceramic layer, a rare-earth oxide ceramic layer, a rare-earth nitride ceramic layer, a rare-earth boride ceramic layer, a rare-earth carbide ceramic layer, a nickel-cobalt oxide ceramic layer, a nickel-cobalt nitride ceramic layer, a nickel-cobalt boride ceramic layer, a nickel-cobalt carbide ceramic layer, or a high silica molecular sieve ceramic layer.
[0043] In some embodiments, the conductive film layer 140 may employ a resistive film layer, such as a film layer / coating containing a resistive material. The resistive material here includes, but is not limited to: a doped ceramic semiconductor, "conductive" ceramic (such as molybdenum disilicide), carbon, graphite, metal, metal alloy, and a composite material made of a ceramic material and a metal material. The composite material may include doped or undoped ceramic. Examples of suitable doped ceramic include doped silicon carbide. Examples of suitable metal include titanium, zirconium, tantalum, and platinum family metals. Examples of suitable metal alloy include stainless steel, alloys containing nickel, cobalt, chromium, aluminum, titanium, zirconium, hafnium, niobium, molybdenum, tantalum, tungsten, tin, gallium, manganese, and iron, and superalloys based on nickel, iron, cobalt, stainless steel, and iron-manganese-aluminum. The resistive material preferably includes one or more of a doped ceramic semiconductor, conductive ceramic, carbon, graphite, graphene, metal, metal alloy, doped ceramic, and a composite material of metals. The resistive material further preferably includes one or more of silver, platinum, copper, nickel, and palladium.
[0044] In one embodiment, as shown in FIG. 1, each of the first section 112 and the second section 113 is provided with a conductive film layer 140, and both the first section 112 and the second section 113 are heating sections. Or, the first section 112 may include a first heating section 1121, and the second section 113 may include a second heating section 1131. Current of the first heating section 1121 and current of the second heating section 1131 flow through a conductive film layer between each first transverse electrode 122 and each second transverse electrode 132, so that the first heating section 1121 and the second heating section 1131 generate heat. That is, the current flows in the axial direction from a first transverse electrode 122 corresponding to this section to a second transverse electrode 132 corresponding to this section, or from a second transverse electrode 132 corresponding to this section to a first transverse electrode 122 corresponding to this section.
[0045] Specifically, the first longitudinal electrode 121 and the second longitudinal electrode 131 are connected to an external power supply. The first longitudinal electrode 121 and the second longitudinal electrode 131 are respectively connected to a positive electrode and a negative electrode of the external power supply. The first longitudinal electrode 121 can be connected to the positive electrode and the second longitudinal electrode 131 can be connected to the negative electrode, or the first longitudinal electrode 121 can be connected to the negative electrode and the second longitudinal electrode 131 can be connected to the positive electrode. An example in which the first longitudinal electrode 121 is connected to the positive electrode and the second longitudinal electrode 131 is connected to the negative electrode is used. The current flows from the first longitudinal electrode 121 to the first transverse electrode 122 and flows from the first transverse electrode 122 to the conductive film layer 140. The current moves in the axial direction within the conductive film layer 140 and flows to the second transverse electrode 132. That is, the current in each heating section moves in the axial direction. Further, referring to FIG. 1, a length L1 of the first heating section 1121 in the axial direction is less than a length L2 of the second heating section 1131 in the axial direction. In the above embodiment, the temperature rise rate of the second heating section 1131 is reduced by setting the length L2 of the second heating section 1131 to be greater, that is, by setting the conductive film layer 140 of the second heating section 1131 to be longer. A specific principle is explained as follows:
[0046] An example in which the conductive film layer 140 is an infrared electrothermal film layer is used for explanation. A resistance of the infrared heating tube 100 can be estimated based on a resistance calculation formula of a wire, where ρ represents a resistivity; after an infrared lamination process is stabilized, ρ remains basically unchanged; L represents a length of an infrared heating film in a current direction; and S represents an area of a cross section of the infrared heating film that is perpendicular to the current direction (S=a * b, where a represents a length of the cross section of the infrared heating film that is perpendicular to the current direction, b represents a thickness of the infrared heating film, and S remains basically unchanged after an outer diameter of the infrared tube is determined and the lamination process is stabilized). Therefore, the resistance R of each section of infrared film layer of the infrared heating tube 100 is only related to the length L. A larger L reflects a greater resistance value R. Since voltage of each section of infrared film layer in this embodiment of this application is inputted by the first transverse electrode 122 and the second transverse electrode 132 that correspond to each section of infrared film layer, and is equal to inputted voltage U. Based on a formula, the power is P = U 2 R , so that heating power P of each section of film layer is inversely proportional to the film length L, that is, a power ratio of each film layer is P 1 P 2 = L 2 L 1 . Based on a formula for a unit area power density: E = P S , since an arc length of each horizontal cross section of the infrared film is equal, S1 / S2=L1 / L2, that is E 1 E 2 = L 2 2 L 1 2 . A ratio of a unit area power density E of each section of film layer is inversely proportional to a square of the infrared film length of the film layer. Therefore, A greater infrared film length L reflects a smaller unit area power density E and slower temperature rise.
[0047] As can be seen from the above, in this embodiment of this application, a ratio of the unit area power densities E of different heating sections is: E 1 E 2 = L 2 2 L 1 2 , where E1 and E2 represent unit area power densities of different heating sections, and L1 and L2 represent the lengths of different heating sections in the axial direction.
[0048] Referring to FIG. 1, in some embodiments, the length L2 of the second heating section 1131 in the axial direction is 1.5 to 2 times the length L1 of the first heating section 1121 in the axial direction. In some embodiments, the length L1 of the first heating section 1121 in the axial direction is 5-15 mm.
[0049] Referring to FIG. 1 and FIG. 2, the first longitudinal electrode 121 and the second longitudinal electrode 131 are both spaced apart from the conductive film layers 140 to insulate the longitudinal electrodes (the first longitudinal electrode 121 and the second longitudinal electrode 131) from the conductive film layers 140, so that the current flowing through the longitudinal electrodes cannot flow toward the conductive film layers 140. As shown in FIG. 1, a distance between the first longitudinal electrode 121 and the conductive film layer 140 is d1. As shown in FIG. 2, a distance between the second longitudinal electrode 131 and the conductive film layer 140 is d2. In some embodiments, widths of d1 and d2 are 0.2-2 mm.
[0050] Referring to FIG. 1, the base body 110 is made of an insulating material such as ceramics, glass, or quartz, or may be made of a metal material that has undergone insulation treatment. In this way, since the first longitudinal electrode 121 and the second longitudinal electrode 131 are spaced apart from the conductive film layers 140, the first longitudinal electrode 121 and the second longitudinal electrode 131 can be spaced apart from the conductive film layers 140 by a section of base body 110, thereby insulating the longitudinal electrodes from the conductive film layers 140.
[0051] In the embodiment shown in FIG. 1, the temperature rise rate is controlled by changing a length of the conductive film layer 140. In this embodiment, widths of the first longitudinal electrode 121 and the second longitudinal electrode 131 are 1-5 mm, and widths of each first transverse electrode 122 and each second transverse electrode 132 are 0.5-2 mm.
[0052] In the embodiment shown in FIG. 1, the first transverse electrode 122 is shared between the first heating section 1121 and the second heating section 1131. Certainly, in other embodiments, the second transverse electrode 132 may be shared, depending on an arrangement manner of the transverse electrodes on the base body 110. In the embodiment shown in FIG. 1, the first transverse electrode 122 is shared between the first heating section 1121 and the second heating section 1131, and the shared first transverse electrode 122 is separately connected to the conductive film layer 140 of the first heating section 1121 and the conductive film layer 140 of the second heating section 1131. In other embodiments, the first heating section 1121 and the second heating section 1131 may not share an electrode. Without sharing an electrode, two transverse electrodes (the first transverse electrode 122 and / or the second transverse electrode 132) between the first heating section 1121 and the second heating section 1131 only need to be spaced apart from each other, so that the two transverse electrodes between the first heating section 1121 and the second heating section 1131 are insulated.
[0053] As shown in FIG. 1, the base body 110 further includes a third section 114. The third section 114 is adjacent to the second section 113. The third section 114 is also configured as a heating section, which means that the third section 114 includes a third heating section 1141. Current of the third heating section 1141 flows through a conductive film layer between a first transverse electrode 122 and a second transverse electrode 132 that correspond to the third heating section 1141, so that the third heating section 1141 generates heat.
[0054] As shown in FIG. 1, lengths of the first heating section 1121, the second heating section 1131, and the third heating section 1141 in the axial direction are L1, L2, and L3, respectively. Preferably, L1<L3<L2. Thus, in the early stage of the heating phase, the temperature rise rate of the first heating section 1121 in the upper stage is the highest; the temperature rise rate of the third heating section 1141 is the next highest; and the temperature rise rate of the second heating section 1131 is the lowest.
[0055] The above-mentioned method for controlling a temperature rise rate of a heating section is to change a length of the heating section. In other embodiments, the temperature rise rate can be controlled based on a width of a transverse electrode. As shown in FIG. 3, one of each first transverse electrode 122 and each second transverse electrode 132 of the first heating section 1121 is a wide electrode, and the other one is a narrow electrode; and the wide electrode is disposed in the second section 113. Specifically, among the first transverse electrode 122 and the second transverse electrode 132 of the first heating section 1121, it is possible that the first transverse electrode 122 is close to the second section 113 and located in the second section 113, or it is possible that the second transverse electrode 132 is close to the second section 113 and located in the second section 113. However, no matter which transverse electrode is located in the second section 113, the electrode is configured to be wider. This can slow down the temperature rise of the second section 113. The reason is that the resistance of an electrode coating is close to zero, and an electrode region generates almost no heat, thus making the temperature rise of the second section 113 slower. The wide and narrow electrodes referred to herein mean sizes of the electrodes in the axial direction of the base body 110.
[0056] In the embodiment shown in FIG. 3, the first transverse electrode 122 of the first heating section 1121 is configured to be wider, to cover the second section 113. The base body 110 further includes a third section 114 adjacent to the second section 113. The third section 114 includes a third heating section 1141, meaning that the third section 114 is a heating section. The wide electrode (i.e., the first transverse electrode 122 of the first heating section 1121 shown in FIG. 3) of the first heating section 1121 is a common electrode between the first heating section 1121 and the third heating section 1141. The second section 113 is covered by the wider first transverse electrode 122, and generates almost no heat.
[0057] Further, a length of the wide electrode in the axial direction is 2-10 mm. Referring to FIG. 3, the first transverse electrode 122 of the first heating section 1121 is a wide electrode, and a width H1 (i.e., a length in the axial direction) of the wide electrode is 2-10 mm.
[0058] In one embodiment, as shown in FIG. 3, the base body 110 further includes a fourth section 115 and a fifth section 116. The fourth section 115 is covered by a wide electrode, i.e., a second transverse electrode 132. The fifth section 116 is a heating section. The third heating section 1141 and the heating section on the fifth section 116 share the second transverse electrode 132 on the fourth section 115. A width H2 of the wide electrode located on the fourth section 115 is 2-10 mm.
[0059] In the embodiments shown in FIG. 1 to FIG. 4, the conductive film layer 140 can be continuously arranged in the axial direction. The conductive film layer 140 extends from one end of the base body 110 to another end. Desired electrodes are arranged on the conductive film layer 140, and widths of the electrodes are controlled. In the embodiments shown in FIG. 5 and FIG. 6, the second section 113 of the base body 110 is not provided with a conductive film layer 140. As shown in FIG. 5, the first section 112 is a heating section. That is, the first section 112 includes a first heating section 1121. Current of the first heating section 1121 flows through a conductive film layer 140 between each first transverse electrode 122 and each second transverse electrode 132, so that the first heating section 1121 generates heat. If the second section 113 is not provided with a conductive film layer 140, the second section 113 will not generate heat, thus setting the temperature rise rate of the first section 112 to be greater than that of the second section 113 in this application. As shown in FIG. 5, a length of the second section 113 is K1. A section with a length of K1 is not provided with a conductive film layer 140.
[0060] In the embodiment shown in FIG. 5, the base body 110 further includes a third section 114. The third section 114 is a heating section. In one embodiment, a temperature rise rate of the third section 114 may be set to be less than a temperature rise rate of the first section 112.
[0061] Specifically, referring to FIG. 5, there are three methods for not providing the conductive film layer 140 on the second section 113. The first method is to directly not coat the second section 113 with the conductive film layer 140. The second method is to first coat the entire base body 110 with the conductive film layer 140 and then remove the conductive film layer 140 from the second section 113. The third method is to partially remove the conductive film layer 140 coated in the second section 113, so that the conductive film layer 140 in the second section 113 is separated by the base body 110 to form at least two independent conductive film layers 140.
[0062] In other words, in the embodiment shown in FIG. 5, the conductive film layer 140 is not continuously arranged in the axial direction, and the second section 113 is a spacing region of the conductive film layer 140. Specifically, the conductive film layer 140 is configured as a discontinuous conductive film layer 140. The spacing region is provided in a middle section of the conductive film layer 140. The spacing region is the second section 113, so that the temperature rise of the second section 113 is slower.
[0063] In this embodiment of this application, as shown in FIG. 1, FIG. 3, and FIG. 5, each first transverse electrode 122 and each second transverse electrode 132 are alternately arranged in the axial direction.
[0064] Certainly, in other embodiments, as shown in FIG. 7, each first transverse electrode 122 and each second transverse electrode 132 may not be alternately arranged in the axial direction. As shown in FIG. 7, two second transverse electrodes 132 are arranged adjacent to each other. Certainly, in other embodiments, two first transverse electrodes 122 may be arranged adjacent to each other.
[0065] Specifically, as shown in FIG. 7, the first section 112 includes a first heating section 1121. Current of the first heating section 1121 flows through the conductive film layer 140 between each first transverse electrode 122 and each second transverse electrode 132, so that the first heating section 1121 generates heat. The second section 113 is provided with a conductive film layer 140 and two first transverse electrodes 122 or two second transverse electrodes 132. The conductive film layer 140 is connected to the two first transverse electrodes 122 or the two second transverse electrodes 132. The conductive film layer 140 of the second section 113 is connected to two electrodes of the same type, so no current passes through and the second section 113 does not generate heat.
[0066] Further, as shown in FIG. 7, the base body 110 further includes a third section 114 adjacent to the second section 113. The third section 114 includes a third heating section 1141. Current of the third heating section 1141 flows through the conductive film layer 140 between each first transverse electrode 122 and each second transverse electrode 132, so that the third heating section 1141 generates heat.
[0067] As shown in FIG. 7, starting from the top end of the base body 110, each first transverse electrode 122 and each second transverse electrode 132 are sequentially arranged in the axial direction as follows: a first transverse electrode 122, a second transverse electrode 132, a second transverse electrode 132, and a first transverse electrode 122. In other embodiments, it may be: a second transverse electrode 132, a first transverse electrode 122, a first transverse electrode 122, and a second transverse electrode 132.
[0068] Continuing to refer to FIG. 1, FIG. 3, and FIG. 5, the first longitudinal electrode 121 and the second longitudinal electrode 131 are respectively arranged at two bisecting points in the circumferential direction of the base body 110.
[0069] At each position of a longitudinal electrode at which a transverse electrode extends, two symmetrically arranged transverse electrodes extend in different directions, and the two transverse electrodes extend in a wrap-around manner toward the other longitudinal electrode. Tail ends of the transverse electrodes are spaced apart from the other longitudinal electrode to insulate the tail ends of the transverse electrodes from the other longitudinal electrode.
[0070] An embodiment of this application further provides a heating tube 100. Referring to FIG. 1, the heating tube 100 includes a base body 110 and conductive film layers 140. An accommodation cavity 111 is defined within the base body 110. The accommodation cavity 111 is configured to accommodate at least part of an aerosol generating product. Aerosols generated after the aerosol generating product 101 is heated flow out from a top end of the base body 110. The base body 110 at least includes a first section 1123 and a second section 113 that are adjacent to each other in an axial direction. The first section 112 is close to the top end of the base body 110, and the second section 113 is located below the first section 112 in the axial direction and is adjacent to the first section 112. A plurality of heating sections 112 are disposed on the base body 110 in the axial direction. The conductive film layers 140 are arranged on the heating sections 112. Current in the conductive film layers 140 of the heating sections 112 flows in the axial direction of the base body 110, so that the heating sections 112 generate heat. A temperature of a temperature field of the first section 112 is greater than a temperature of a temperature field of the second section 113, so that cut tobaccos close to an upper section of the heating tube 100 can quickly reach an atomization temperature, to ensure a volume of aerosols inhaled in the first few puffs. Cut tobaccos close to a middle-lower section are heated slowly, which can effectively slow down formation and upward diffusion of water vapor in the cut tobaccos close to the middle-lower section, and reduce a temperature of the aerosols inhaled in the first few puffs.
[0071] In addition, the arrangement of the first electrode 120 and the second electrode 130 in this embodiment of this application allows the current of the heating sections of the heating tube 100 to flow in the axial direction. This arrangement manner is suitable for a thick and short base body. This is conducive to reducing the resistance of the conductive film layers 140 of the heating sections and improving the temperature rise rate of the heating sections. The thick and short base body herein can be understood as: an inner diameter of the base body 110 is between 6 mm and 15 mm, or between 7 mm and 15 mm, or between 7 mm and 14 mm, or between 7 mm and 12 mm, or between 7 mm and 10 mm. An axial extension length of the base body 110 is between 15 mm and 30 mm, or between 15 mm and 28 mm, or between 15 mm and 25 mm, or between 16 mm and 25 mm, or between 18 mm and 25 mm, or between 18 mm and 24 mm, or between 18 mm and 22 mm. The base body 110 with the above size is suitable for a thick and short aerosol generating product 101.
[0072] An embodiment of this application further provides an aerosol generating device. As shown in FIG. 9, the aerosol generating device 10 includes the above heating tube 100 and a power supply 200. The power supply 200 is configured to supply power to the heating tube 100. Both the first electrode 120 and the second electrode 130 of the heating tube 100 are electrically connected to the power supply 200.
[0073] Apparently, the above embodiments of this application are only examples made to clearly explain this application, and are not intended to limit the implementations of this application. A person of ordinary skill in the art can make various significant changes, readjustments, and replacements, without departing from the protection scope of this application. It is not necessary and impossible to exhaustively list all implementations here. Any modifications, equivalent replacements, improvements, and the like that are made within the spirit and the principle of this application shall all fall within the protection scope of the claims of this application.
Claims
1. A heating tube, comprising: a base body in which an accommodation cavity for accommodating at least part of an aerosol generating product is defined, wherein aerosols generated after the aerosol generating product is heated flow out from a top end of the base body, and the base body at least comprises a first section and a second section that are adjacent to each other in an axial direction, the first section being close to the top end of the base body; a conductive film layer arranged on at least part of a surface of the base body; a first electrode comprising a first longitudinal electrode disposed in an axial direction of the base body, and at least one first transverse electrode, wherein each first transverse electrode extends from the first longitudinal electrode in a circumferential direction of the base body; and a second electrode comprising a second longitudinal electrode disposed in the axial direction of the base body, and at least one second transverse electrode, wherein each second transverse electrode extends from the second longitudinal electrode in the circumferential direction of the base body, wherein: a first transverse electrode and a second transverse electrode that are adjacent to each other are electrically connected to a conductive film layer between the first transverse electrode and the second transverse electrode, to form a heating section; and a temperature rise rate of the first section is greater than a temperature rise rate of the second section.
2. The heating tube according to claim 1, wherein the first section comprises a first heating section, and the second section comprises a second heating section; wherein current of the first heating section and current of the second heating section both flow through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the first heating section and the second heating section generate heat.
3. The heating tube according to claim 2, wherein a length L1 of the first heating section in the axial direction is less than a length L2 of the second heating section in the axial direction.
4. The heating tube according to claim 3, wherein L2 is 1.5 to 2 times L1.
5. The heating tube according to claim 3, wherein the length of the first heating section in the axial direction is 5-15 mm.
6. The heating tube according to claim 2, wherein: each first transverse electrode or each second transverse electrode arranged between the first heating section and the second heating section is a common electrode, the common electrode being separately connected to a conductive film layer of the first heating section and a conductive film layer of the second heating section; or each first transverse electrode and each second transverse electrode that are arranged between the first heating section and the second heating section are spaced apart from each other, to insulate the first transverse electrode from the second transverse electrode.
7. The heating tube according to claim 2, wherein the base body further comprises a third section adjacent to the second section, the third section comprising a third heating section, wherein current of the third heating section flows through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the third heating section generates heat.
8. The heating tube according to claim 7, wherein a relationship of a length L1 of the first heating section in the axial direction, a length L2 of the second heating section in the axial direction, and a length L3 of the third heating section in the axial direction is as follows: L1<L3<L2.
9. The heating tube according to claim 1, wherein the first section comprises a first heating section, wherein: current of the first heating section flows through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the first heating section generates heat; and one of the first transverse electrode and the second transverse electrode of the first heating section is a wide electrode, and the other one is a narrow electrode, the wide electrode being disposed in the second section.
10. The heating tube according to claim 9, wherein the base body further comprises a third section adjacent to the second section, the third section comprising a third heating section, wherein the wide electrode is a common electrode between the first heating section and the third heating section.
11. The heating tube according to claim 9, wherein a length of the wide electrode in the axial direction is 2-10 mm.
12. The heating tube according to any one of claims 1 to 11, wherein the conductive film layer is continuously arranged in the axial direction.
13. The heating tube according to claim 1, wherein: the first section comprises a first heating section, wherein current of the first heating section flows through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the first heating section generates heat; and the second section is not provided with the conductive film layer.
14. The heating tube according to claim 1, wherein: the first section comprises a first heating section, wherein current of the first heating section flows through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the first heating section generates heat; the conductive film layer is not continuously arranged in the axial direction; and the second section is a spacing region of the conductive film layer.
15. The heating tube according to claim 1, wherein the first transverse electrode and the second transverse electrode are alternately arranged in the axial direction.
16. The heating tube according to claim 1, wherein: the first section comprises a first heating section, wherein current of the first heating section flows through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the first heating section generates heat; and the second section is provided with a conductive film layer and two first transverse electrodes or two second transverse electrodes, wherein the conductive film layer is connected to the two first transverse electrodes or the two second transverse electrodes.
17. The heating tube according to claim 16, wherein the base body further comprises a third section adjacent to the second section, the third section comprising a third heating section, wherein current of the third heating section flows through the conductive film layer between the first transverse electrode and the second transverse electrode, so that the third heating section generates heat.
18. The heating tube according to claim 17, wherein starting from the top end of the base body, the first transverse electrode and the second transverse electrode are sequentially arranged in the axial direction as follows: a first transverse electrode, a second transverse electrode, a second transverse electrode, and a first transverse electrode; or a second transverse electrode, a first transverse electrode, a first transverse electrode, and a second transverse electrode.
19. The heating tube according to claim 16, wherein the conductive film layer is continuously arranged in the axial direction.
20. The heating tube according to claim 1, wherein the first longitudinal electrode and the second longitudinal electrode are spaced apart from the conductive film layer to insulate the first longitudinal electrode and the second longitudinal electrode from the conductive film layer.
21. The heating tube according to claim 1, wherein the first longitudinal electrode and the second longitudinal electrode are respectively arranged at two bisecting points in the circumferential direction of the base body.
22. The heating tube according to claim 1, wherein: lengths of the first longitudinal electrode and the second longitudinal electrode in the circumferential direction are 1-5 mm; or lengths of each first transverse electrode and each second transverse electrode in the axial direction are 0.5-2 mm; or a length of a gap between each longitudinal electrode and the conductive film layer in the circumferential direction is 0.2-2 mm.
23. A heating tube, comprising: a base body in which an accommodation cavity for accommodating at least part of an aerosol generating product is defined, wherein aerosols generated after the aerosol generating product is heated flow out from a top end of the base body, and the base body at least comprises a first section and a second section that are adjacent to each other in an axial direction, the first section being close to the top end of the base body; a plurality of heating sections disposed on the base body in the axial direction; and conductive film layers arranged in the heating sections, wherein current of the conductive film layers flow in the axial direction to cause the heating sections to generate heat, wherein a temperature of a temperature field of the first section is greater than a temperature of a temperature field of the second section.
24. An aerosol generating device, comprising the heating tube according to any one of claims 1 to 23, and a power supply for supplying power to the heating tube.
Citation Information
Patent Citations
Heating tube and aerosol generating device
CN119318402A