Heating tube and aerosol generation device

Abstract

A heating tube (100) and an aerosol generation device (10). The heating tube (100) comprises: a base body (110), in which an accommodating cavity (111) for accommodating at least part of an aerosol generating product (101) is defined, wherein the base body (110) comprises at least a first section (112) and a second section (113) which are arranged adjacent to each other in an axial direction, the first section (112) being close to the top end of the base body (110); an electrically conductive film layer (140), which is arranged on at least a local surface of the base body (110); a first electrode (120), which comprises a first longitudinal electrode (121) arranged in the axial direction of the base body (110) and at least one first transverse electrode (122) extending from the first longitudinal electrode (121) in the circumferential direction of the base body (110); and a second electrode (130), which comprises a second longitudinal electrode (131) arranged in the axial direction of the base body (110) and at least one second transverse electrode (132) extending from the second longitudinal electrode (131) in the circumferential direction of the base body (110). The first transverse electrode (122) and the second transverse electrode (132) which are arranged adjacent to each other are electrically connected to the electrically conductive film layer (140) therebetween to form a heating section. The temperature rise rate of the first section (112) is greater than the temperature rise rate of the second section (113). By means of the present heating tube (100), while the amount of aerosol inhaled in the first few puffs is ensured, the inhalation temperature of the first few puffs can also be reduced.

Description

Heating tube and aerosol generating device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims partial priority to the Chinese patent application filed with the China Patent Office on July 17, 2023, with application number 202310871812.2, and application name “Heating tube and aerosol generating device”, all contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of heat-not-burn aerosol generation, and in particular to a heating tube and an aerosol generating device. Background Art

[0004] Smoking products such as cigarettes and cigars burn tobacco to produce smoke during use. Attempts have been made to provide alternatives to these tobacco-burning products by using products that release compounds without burning. Examples of such products are so-called heat-not-burn products, which release compounds by heating the tobacco rather than burning it.

[0005] Existing heating tubes for heat-not-burn products commonly experience mouthburning during the first few puffs. While some technologies can address this issue by controlling the heating temperature, these technologies are complex and require additional external electrodes, resulting in high costs. Furthermore, the control circuitry and logic are complex, leading to high costs.

[0006] Application Contents

[0007] One embodiment of the present application provides a heating tube and an aerosol generating device.

[0008] In one aspect, the present application provides a heating tube, comprising:

[0009] a substrate, wherein a cavity is defined within the substrate, the cavity being configured to accommodate at least a portion of the aerosol-generating article, wherein aerosol generated by the aerosol-generating article upon heating flows out from a top end of the substrate, the substrate comprising at least a first section and a second section adjacently disposed in an axial direction, the first section being disposed proximate to the top end of the substrate;

[0010] A conductive film layer is provided on at least a partial surface of the substrate;

[0011] a first electrode, comprising a first longitudinal electrode arranged along the axial direction of the substrate, and at least one first transverse electrode, wherein the first transverse electrode extends from the first longitudinal electrode along the circumferential direction of the substrate;

[0012] a second electrode comprising a second longitudinal electrode arranged along the axial direction of the substrate, and at least one second transverse electrode, wherein the second transverse electrode extends from the second longitudinal electrode along the circumferential direction of the substrate;

[0013] The first transverse electrode and the second transverse electrode are adjacently arranged and electrically connected to the conductive film layer therebetween to form a heating segment;

[0014] Wherein, the heating rate of the first section is greater than the heating rate of the second section.

[0015] In some embodiments, the first section includes a first heating section, the second section includes a second heating section, and the currents of the first heating section and the second heating section both flow in the conductive film layer between the first lateral electrode and the second lateral electrode, causing the first heating section and the second heating section to generate heat.

[0016] In some embodiments, the length L1 of the first heating segment along the axial direction is smaller than the length L2 of the second heating segment along the axial direction.

[0017] In some embodiments, L2 is 1.5 to 2 times greater than L1.

[0018] In some embodiments, the length of the first heating section along the axial direction is 5 to 15 mm.

[0019] In some embodiments, the first lateral electrode or the second lateral electrode disposed between the first heating segment and the second heating segment is a common electrode, and the common electrode is connected to the conductive film layer of the first heating segment and the conductive film layer of the second heating segment, respectively; or

[0020] The first transverse electrode and the second transverse electrode disposed between the first heating segment and the second heating segment are spaced apart from each other, so that the first transverse electrode and the second transverse electrode are insulated from each other.

[0021] In some embodiments, the substrate also includes a third segment arranged adjacent to the second segment, and the third segment includes a third heating segment. The current of the third heating segment flows in the conductive film layer between the first lateral electrode and the second lateral electrode, causing the third heating segment to generate heat.

[0022] In some embodiments, the relationship among the axial length L1 of the first heating segment, the axial length L2 of the second heating segment, and the axial length L3 of the third heating segment is as follows: L1 < L3 < L2.

[0023] In some embodiments, the first section includes a first heating segment, and a current of the first heating segment flows in the conductive film layer between the first lateral electrode and the second lateral electrode, causing the first heating segment to generate heat;

[0024] Among them, one of the first transverse electrode and the second transverse electrode of the first heating section is a wide electrode and the other is a narrow electrode, and the wide electrode is arranged in the second section. (The wide electrode and narrow electrode are not specified here, for fear that the description will be too complicated. The detailed explanation can be found in the manual.)

[0025] In some embodiments, the substrate further includes a third section adjacent to the second section, the third section includes a third heating segment, and the wide electrode is a common electrode between the first heating segment and the third heating segment.

[0026] In some embodiments, the axial length of the wide electrode is 2 to 10 mm.

[0027] In some embodiments, the conductive film layer is continuously arranged in the axial direction.

[0028] In some embodiments, the first section includes a first heating segment, and a current of the first heating segment flows in the conductive film layer between the first lateral electrode and the second lateral electrode, causing the first heating segment to generate heat;

[0029] Wherein, the second section is not provided with the conductive film layer.

[0030] In some embodiments, the first section includes a first heating segment, and a current of the first heating segment flows in the conductive film layer between the first lateral electrode and the second lateral electrode, causing the first heating segment to generate heat;

[0031] The conductive film layer is discontinuously arranged in the axial direction, and the second section is a discontinuous area of ​​the conductive film layer.

[0032] In some embodiments, the first transverse electrodes and the second transverse electrodes are alternately arranged in the axial direction.

[0033] In some embodiments, the first section includes a first heating segment, and a current of the first heating segment flows in the conductive film layer between the first lateral electrode and the second lateral electrode, causing the first heating segment to generate heat;

[0034] A conductive film layer is provided on the second section, and two first transverse electrodes or two second transverse electrodes are also provided. The conductive film layer is connected to the two first transverse electrodes or the two second transverse electrodes respectively.

[0035] In some embodiments, the substrate also includes a third segment arranged adjacent to the second segment, and the third segment includes a third heating segment. The current of the third heating segment flows in the conductive film layer between the first lateral electrode and the second lateral electrode, causing the third heating segment to generate heat.

[0036] In some embodiments, starting from the top of the substrate, the first transverse electrodes and the second transverse electrodes are arranged in sequence in the axial direction as follows:

[0037] a first transverse electrode, a second transverse electrode, a second transverse electrode, and a first transverse electrode; or

[0038] The second horizontal electrode, the first horizontal electrode, and the first and second horizontal electrodes.

[0039] In some embodiments, the conductive film layer is continuously arranged in the axial direction.

[0040] In some embodiments, the first longitudinal electrode and the second longitudinal electrode are spaced apart from the conductive film layer, so that the first longitudinal electrode, the second longitudinal electrode and the conductive film layer are insulated from each other.

[0041] In some embodiments, the first longitudinal electrode and the second longitudinal electrode are respectively disposed at two bisecting points of the substrate along the circumferential direction.

[0042] In some embodiments, the circumferential length of the first longitudinal electrode and the second longitudinal electrode is 1 to 5 mm; or, the axial length of the first transverse electrode and the second transverse electrode is 0.5 to 2 mm; or, the circumferential length of the interval between the longitudinal electrode and the conductive film layer is 0.2 to 2 mm.

[0043] A heating tube, comprising:

[0044] a substrate, wherein a cavity is defined within the substrate, the cavity being configured to accommodate at least a portion of the aerosol-generating article, wherein aerosol generated by the aerosol-generating article upon heating flows out from a top end of the substrate, the substrate comprising at least a first section and a second section adjacently disposed in an axial direction, the first section being disposed proximate to the top end of the substrate;

[0045] The base body is provided with a plurality of heating sections along the axial direction;

[0046] A conductive film layer is provided in each of the heating segments, and the current of the conductive film layer flows in the axial direction to make the heating segment generate heat;

[0047] Wherein, the temperature of the temperature field of the first section is higher than the temperature of the temperature field of the second section.

[0048] An aerosol generating device comprises the heating tube as described above, and also comprises a power supply, wherein the power supply is used to supply power to the heating tube.

[0049] The arrangement of the first and second electrodes, particularly between the first and second transverse electrodes and the heating section, in the heating tube reduces the resistance of the heating section and increases the heating rate of the heating section. Furthermore, the heating rate of the first section near the top of the base is set to be greater than that of the second section. As a result, during the early heating phase, the upper section of the heating tube heats up faster than the middle and lower sections. After a cigarette is inserted, the tobacco near the upper section of the heating tube quickly reaches the atomization temperature, ensuring a high volume of smoke in the first few puffs. The tobacco near the middle and lower sections heats up more slowly, effectively slowing the formation and upward diffusion of water vapor in these sections and reducing the temperature of the smoke in the first few puffs. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0051] FIG1 is a schematic structural diagram of a heating tube in one embodiment of the present application;

[0052] FIG2 is a schematic structural diagram of the structure shown in FIG1 from another perspective;

[0053] FIG3 is a schematic structural diagram of a heating tube in one embodiment of the present application;

[0054] FIG4 is a schematic structural diagram of the structure shown in FIG3 from another perspective;

[0055] FIG5 is a schematic structural diagram of a heating tube in one embodiment of the present application;

[0056] FIG6 is a schematic structural diagram of the structure shown in FIG5 from another perspective;

[0057] FIG7 is a schematic structural diagram of a heating tube in one embodiment of the present application;

[0058] FIG8 is a schematic structural diagram of the structure shown in FIG7 from another perspective;

[0059] FIG9 is a schematic structural diagram of an aerosol generating device in one embodiment of the present application.

[0060] In the picture:

[0061] 100. Heating tube; 101. Aerosol generating product;

[0062] 110, base; 111, accommodating cavity; 112, first section; 113, second section; 114, third section; 115, fourth section; 116, fifth section;

[0063] 1121, first heating section; 1131, second heating section; 1141, third heating section;

[0064] 120, first electrode; 121, first longitudinal electrode; 122, first transverse electrode;

[0065] 130, second electrode; 131, second longitudinal electrode; 132, second transverse electrode;

[0066] 140. Conductive film layer;

[0067] 10. Aerosol generating device;

[0068] 200. Power supply. DETAILED DESCRIPTION

[0069] To facilitate understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. The specific embodiments are intended only to explain the present application and are not intended to limit the present application. In addition, it should be noted that, for ease of description, the accompanying drawings only illustrate some structures relevant to the present application, not all structures.

[0070] An embodiment of the present application provides a heating tube. As shown in Figures 1 and 2, the heating tube 100 includes a substrate 110, a first electrode 120, a second electrode 130, and a conductive film layer 140. The substrate 110 is generally cylindrical and defines a cavity 111 therein. The cavity 111 is used to accommodate at least a portion of an aerosol-generating article 101 (see Figure 9). The aerosol-generating article 101 is a substrate capable of releasing volatile compounds that can form an aerosol, such as a cigarette. The conductive film layer 140 is disposed on at least a portion of the surface of the substrate.

[0071] 1 and 9 , after the aerosol-generating article 101 is heated, the aerosol generated flows out from the top of the substrate 110. As shown in FIG1 , the substrate 110 includes at least a first section 112 and a second section 113 adjacent to each other in the axial direction. The first section 112 is located near the top of the substrate 110, and the second section 113 is located axially below and adjacent to the first section 112.

[0072] 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 disposed along the axial direction of the substrate 110, and the first transverse electrode 122 extends from the first longitudinal electrode 121 along the circumference of the substrate 110.

[0073] 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 disposed along the axial direction of the substrate 110 , and the second transverse electrode 132 extends from the second longitudinal electrode 131 along the circumference of the substrate 110 .

[0074] As shown in FIG. 1 and FIG. 2 , the adjacent first horizontal electrode 122 and the second horizontal electrode 132 are electrically connected to the conductive film layer 140 therebetween to form a heating segment.

[0075] In the embodiment of the present application, the heating rate of the first section 112 is greater than the heating rate of the second section 113. As a result, in the early stage of the heating phase, the temperature of the upper section of the heating tube 100 is greater than that of the middle and lower sections. After the cigarette is inserted, the tobacco near the upper section of the heating tube 100 can quickly reach the atomization temperature, ensuring the amount of smoke in the first few puffs. The tobacco near the middle and lower sections heats up more slowly, which can effectively slow down the formation and upward diffusion of water vapor in the middle and lower sections of the tobacco, and reduce the temperature of the smoke in the first few puffs. In the middle and late stages of the heating phase, due to the heat conduction effect of the heating tube 100 itself, the temperatures of the various sections of the entire heating tube 100 gradually tend to be consistent, which can provide users with continuous smoke and aroma.

[0076] At the same time, the heating tube 100 is simple in structure and low in cost by configuring the first electrode 120 and the second electrode 130 to be a cross-electrode structure including longitudinal electrodes and transverse electrodes, thereby achieving different control over the heating speed of each section through the cross-electrode structure.

[0077] Specifically, there are many methods for achieving a faster heating rate in the first section 112 than in the second section 113 . For example, the heating rate can be controlled by varying the axial length of the conductive film layer 140 in each section, or by not providing the conductive film layer 140 in a section where a slower heating rate is desired, thereby preventing that section from generating heat, or by varying the width of the electrodes in each section. Each of these methods is described in detail below.

[0078] It is understandable that the conductive film layer 140 can be an infrared electric heating film layer, such as an infrared electric heating coating; the infrared electric heating coating can generate heat energy when powered on, and then generate infrared rays of a certain wavelength. When the wavelength of the infrared ray matches the absorption wavelength of the aerosol-forming matrix, the energy of the infrared ray is easily absorbed by the aerosol-forming matrix. In the embodiment of the present application, the wavelength of the infrared ray is not limited, and it can be an infrared ray of 0.75μm to 1000μm, and optionally a far infrared ray of 1.5μm to 400μm. The infrared electric heating coating can be optionally made by fully mixing far-infrared electric heating ink, ceramic powder and inorganic adhesive, and then printing it on the outer surface of the substrate, and then drying and curing it for a certain period of time. The thickness of the infrared electric heating coating is 30μm-50μm; of course, the infrared electric heating coating can also be made by mixing tin tetrachloride, tin oxide, antimony trichloride, titanium tetrachloride and anhydrous copper sulfate in a certain proportion and then coating it on the outer surface of the substrate; or it can be a silicon carbide ceramic layer, a carbon fiber composite layer, a zirconium titanium oxide ceramic layer. One of the following: ceramic layer, zirconium-titanium nitride ceramic layer, zirconium-titanium boride ceramic layer, zirconium-titanium carbide ceramic layer, iron-based oxide ceramic layer, iron-based nitride ceramic layer, iron-based boride ceramic layer, iron-based carbide ceramic layer, rare earth-based oxide ceramic layer, rare earth-based nitride ceramic layer, rare earth-based boride ceramic layer, rare earth-based carbide ceramic layer, nickel-cobalt-based oxide ceramic layer, nickel-cobalt-based nitride ceramic layer, nickel-cobalt-based boride ceramic layer, nickel-cobalt-based carbide ceramic layer or high silicon molecular sieve ceramic layer.

[0079] In some embodiments, the conductive film layer 140 may be a resistive film layer, such as a film layer / coating containing a resistive material; the resistive material herein includes, but is not limited to, semiconductors such as doped ceramics, "conductive" ceramics (e.g., molybdenum disilicide), carbon, graphite, metals, metal alloys, and composite materials made of ceramic and metal materials. The composite material may include doped or undoped ceramics. Examples of suitable doped ceramics include doped silicon carbide. Examples of suitable metals include titanium, zirconium, tantalum, and platinum group metals. Examples of suitable metal alloys 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 alloys. The resistive material preferably includes one or more of a doped ceramic semiconductor, a conductive ceramic, carbon, graphite, graphene, a metal, a metal alloy, and a composite material of doped ceramics and metals. More preferably, the resistive material includes one or more of silver, platinum, copper, nickel, and palladium.

[0080] In one embodiment, as shown in FIG1 , the first and second sections 112, 113 are both provided with a conductive film layer 140, and both the first and second sections 112, 113 serve as heating sections. Alternatively, the first section 112 includes a first heating section 1121, and the second section 113 includes a second heating section 1131. The current in each of the first and second heating sections 1121, 1131 flows through the conductive film layer between the first and second transverse electrodes 122, 132, thereby generating heat in the first and second heating sections 1121, 1131. In other words, the current flows axially, from the first transverse electrode 122 corresponding to the section to the second transverse electrode 132 corresponding to the section, or vice versa.

[0081] Specifically, the first longitudinal electrode 121 and the second longitudinal electrode 131 are connected to an external power source. The first longitudinal electrode 121 and the second longitudinal electrode 131 are connected to the positive and negative poles of the external power source, respectively. The first longitudinal electrode 121 can be connected to the positive pole and the second longitudinal electrode 131 to the negative pole, or the first longitudinal electrode 121 can be connected to the negative pole and the second longitudinal electrode 131 to the positive pole. Taking the example of the first longitudinal electrode 121 being connected to the positive pole and the second longitudinal electrode 131 to the negative pole, current flows from the first longitudinal electrode 121 to the first transverse electrode 122, and from the first transverse electrode 122 to the conductive film layer 140. The current moves axially within the conductive film layer 140 and flows to the second transverse electrode 132. In other words, the current moves axially within each heating segment.

[0082] Furthermore, referring to FIG1 , the axial length L1 of the first heating segment 1121 is smaller than the axial length L2 of the second heating segment 1131. In the above embodiment, by setting the length L2 of the second heating segment 1131 longer, that is, by setting the conductive film layer 140 of the second heating segment 1131 longer, the heating rate of the second heating segment 1131 is reduced. The specific principle is described as follows:

[0083] Taking the conductive film layer 140 as an infrared electric heating film layer as an example, the resistance of the infrared heating tube 100 can be calculated according to the resistance formula of the wire: To estimate, where ρ is the resistivity, and ρ remains basically unchanged after the infrared film coating process is stable; L is the length of the infrared heating film along the direction of current, and S is the area of ​​the section perpendicular to the direction of current of the infrared heating film (S = a*b, where a is the length of the section perpendicular to the direction of current of the infrared heating film, and b is the thickness of the infrared heating film. The value S remains basically unchanged after the outer diameter of the infrared tube is determined and the coating process is stable); therefore, the resistance R of each infrared film layer of the infrared heating tube 100 is only related to the length L. The larger L is, the larger the resistance R is. Because the voltage of each infrared film layer in the embodiment of the present application is input by the first transverse electrode 122 and the second transverse electrode 132 corresponding to each infrared film layer, and both are equal to the input voltage U, according to the formula power Therefore, the heating power P of each film layer is inversely proportional to the film length L, that is, the power ratio of each film layer is According to the power density per unit area formula: Since the arc lengths of all horizontal sections of the infrared film are equal, S1 / S2 = L1 / L2, that is, The ratio of the power density E per unit area of ​​each film layer is inversely proportional to the square of its infrared film length. Therefore, the longer the infrared film length L, the smaller the power density E per unit area and the slower the temperature rise.

[0084] As can be seen from the above, in the embodiment of the present application, the ratio of the power density per unit area E of different heating sections is: E1 and E2 are the power densities per unit area of ​​different heating sections; L1 and L2 are the lengths of different heating sections along the axial direction.

[0085] 1 , in some embodiments, the axial length L2 of the second heating segment 1131 is 1.5 to 2 times the axial length L1 of the first heating segment 1121. In some embodiments, the axial length L1 of the first heating segment 1121 is 5 to 15 mm.

[0086] 1 and 2 , the first longitudinal electrode 121 and the second longitudinal electrode 131 are spaced apart from the conductive film layer 140 to insulate the longitudinal electrodes (the first longitudinal electrode 121 and the second longitudinal electrode 131) from the conductive film layer 140, preventing current from flowing through the longitudinal electrodes to the conductive film layer 140. As shown in FIG1 , the spacing between the first longitudinal electrode 121 and the conductive film layer 140 is d1, and as shown in FIG2 , the spacing between the second longitudinal electrode 131 and the conductive film layer 140 is d2. In some embodiments, the widths of d1 and d2 range from 0.2 to 2 mm.

[0087] Referring to FIG1 , the substrate 110 is made of an insulating material such as ceramic, glass, or quartz, or may be a metal material that has undergone insulation treatment. Thus, after the first and second longitudinal electrodes 121, 131 are spaced apart from the conductive film layer 140, a distance of the substrate 110 can be provided between the first and second longitudinal electrodes 121, 131, and the conductive film layer 140, thereby insulating the longitudinal electrodes from the conductive film layer 140.

[0088] 1 , the heating rate is controlled by changing the length of the conductive film layer 140. In this embodiment, the width of the first longitudinal electrode 121 and the second longitudinal electrode 131 is 1-5 mm, and the width of the first transverse electrode 122 and the second transverse electrode 132 is 0.5-2 mm.

[0089] In the embodiment shown in FIG1 , the first heating segment 1121 and the second heating segment 1131 share a first transverse electrode 122. In other embodiments, the second transverse electrode 132 may also be shared, depending on the arrangement of the transverse electrodes on the substrate 110. In the embodiment shown in FIG1 , the first heating segment 1121 and the second heating segment 1131 share a first transverse electrode 122, which is connected to the conductive film layer 140 of the first heating segment 1121 and the conductive film layer 140 of the second heating segment 1131, respectively. In other embodiments, the first heating segment 1121 and the second heating segment 1131 may not share a common electrode. In this case, the two transverse electrodes (the first transverse electrode 122 and / or the second transverse electrode 132) disposed between the first heating segment 1121 and the second heating segment 1131 can be spaced apart to insulate the two transverse electrodes.

[0090] As shown in FIG1 , substrate 110 further includes a third section 114. Third section 114 is adjacent to second section 113 and is also configured as a heating section, namely, third section 114 includes a third heating section 1141. Current in third heating section 1141 flows through the conductive film layer between the first lateral electrode 122 and the second lateral electrode 132 corresponding to third heating section 1141, causing third heating section 1141 to generate heat.

[0091] As shown in FIG1 , the axial lengths of the first heating segment 1121, the second heating segment 1131, and the third heating segment 1141 are L1, L2, and L3, respectively. Preferably, L1 < L3 < L2. Thus, in the early stages of the heating phase, the upper first heating segment 1121 heats up the fastest, followed by the third heating segment 1141, and the second heating segment 1131 heats up the slowest.

[0092] The method described above for controlling the heating speed of the heating section involves varying the length of the heating section. In other embodiments, the heating speed can be controlled by adjusting the width of the transverse electrodes. As shown in Figure 3, one of the first and second transverse electrodes 122, 132 of the first heating section 1121 is a wide electrode, while the other is a narrow electrode. The wide electrode is located in the second segment 113. Specifically, the first and second transverse electrodes 122, 132 of the first heating section 1121 may be located in the second segment 113, close to the first segment 113, or the second transverse electrode 132 may be located in the second segment 113, close to the second segment 113. Regardless of which transverse electrode is located in the second segment 113, making it wider can result in slower heating in the second segment 113. This is because the resistance of the electrode coating is near zero, and the electrode area generates almost no heat, resulting in slower heating in the second segment 113. The terms "wide" and "narrow" here refer to the electrode's dimensions along the axial direction of the substrate 110.

[0093] In the embodiment shown in Figure 3 , the first transverse electrode 122 of the first heating segment 1121 is configured to be relatively wide, covering the second segment 113. The substrate 110 also includes a third segment 114 adjacent to the second segment 113. This third segment 114 includes a third heating segment 1141, meaning that the third segment 114 is a heating segment. The wide electrode of the first heating segment 1121 (i.e., the first transverse electrode 122 of the first heating segment 1121 shown in Figure 3 ) serves as a common electrode between the first and third heating segments 1121, 1141. The second segment 113, however, is covered by the wider first transverse electrode 122 and generates virtually no heat.

[0094] Furthermore, the length of the wide electrode along the axial direction is 2 to 10 mm. Referring to Figure 3 , the first transverse electrode 122 of the first heating section 1121 is a wide electrode, and the width H1 of the wide electrode (ie, the length along the axial direction) is 2 to 10 mm.

[0095] In one embodiment, as shown in FIG3 , substrate 110 further includes a fourth section 115 and a fifth section 116. Fourth section 115 is covered by a wide second transverse electrode 132. Fifth section 116 is a heating section. Third heating section 1141 and the heating section in fifth section 116 share the second transverse electrode 132 in fourth section 115. The width H2 of the wide electrode in fourth section 115 is 2 to 10 mm.

[0096] In the embodiments shown in Figures 1 to 4 , the conductive film layer 140 can be continuously disposed in the axial direction. The conductive film layer 140 extends from one end of the substrate 110 to the other. It is sufficient to simply dispose the required electrodes on the conductive film layer 140 and control the electrode width. In the embodiments shown in Figures 5 and 6 , the second section 113 of the substrate 110 is not provided with the conductive film layer 140. As shown in Figure 5 , the first section 112 is a heating section, that is, the first section 112 includes a first heating section 1121. The current in the first heating section 1121 flows through the conductive film layer 140 between the first lateral electrode 122 and the second lateral electrode 132, causing the first heating section 1121 to heat. Since the second section 113 is not provided with the conductive film layer 140, it will not heat up, achieving the effect of setting the heating rate of the first section 112 to be greater than that of the second section 113 in this application. As shown in FIG. 5 , the length of the second section 113 is K1 , and the conductive film layer 140 is not disposed in the section with the length K1 .

[0097] 5 , the substrate 110 further includes a third section 114 , which is a heating section. In one embodiment, the heating rate of the third section 114 can be set to be slower than that of the first section 112 .

[0098] Specifically, referring to FIG. 5 , there are three methods for not providing the conductive film layer 140 in the second section 113. The first method is to directly not apply the conductive film layer 140 to the second section 113. The second method is to first apply the conductive film layer 140 to the entire substrate 110 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 applied in the second section 113, so that the conductive film layer 140 in the second section 113 is separated by the substrate 110 to form at least two independent conductive film layers 140.

[0099] Alternatively, in the embodiment shown in FIG5 , the conductive film layer 140 is discontinuously disposed in the axial direction, and the second section 113 is a discontinuous region of the conductive film layer 140. Specifically, by discontinuously discontinuously disposing the conductive film layer 140 and providing a gap in the middle of the conductive film layer 140, which is the second section 113, the second section 113 can be heated more slowly.

[0100] In the embodiment of the present application, as shown in FIG. 1 , FIG. 3 and FIG. 5 , the first transverse electrodes 122 and the second transverse electrodes 132 are alternately arranged in the axial direction.

[0101] Of course, in other embodiments, as shown in Figure 7, the first transverse electrodes 122 and the second transverse electrodes 132 may not be alternately arranged in the axial direction. As shown in Figure 7, two second transverse electrodes 132 are adjacently arranged. Of course, in other embodiments, two first transverse electrodes 122 may also be adjacently arranged.

[0102] Specifically, as shown in FIG7 , the first section 112 includes a first heating section 1121. Current in the first heating section 1121 flows through the conductive film layer 140 between the first lateral electrode 122 and the second lateral electrode 132, causing the first heating section 1121 to generate heat. The second section 113 is provided with a conductive film layer 140 and two first lateral electrodes 122 or two second lateral electrodes 132. The conductive film layer 140 is connected to the two first lateral electrodes 122 or the two second lateral electrodes 132, respectively. Since the conductive film layer 140 in the second section 113 is connected to two electrodes of the same type, no current flows through the conductive film layer 140, and the second section 113 does not generate heat.

[0103] Furthermore, as shown in Figure 7, the substrate 110 also includes a third section 114 arranged adjacent to the second section 113, and the third section 114 includes a third heating section 1141. The current of the third heating section 1141 flows in the conductive film layer 140 between the first lateral electrode 122 and the second lateral electrode 132 to make the third heating section 1141 generate heat.

[0104] As shown in FIG7 , starting from the top of the substrate 110, the first transverse electrodes 122 and the second transverse electrodes 132 are arranged in the following order in the axial direction: first transverse electrode 122, second transverse electrode 132, second transverse electrode 132, and first transverse electrode 122. In other embodiments, the arrangement may also be: second transverse electrode 132, first transverse electrode 122, first transverse electrode 122, and second transverse electrode 132.

[0105] Continuing to refer to FIG. 1 , FIG. 3 and FIG. 5 , the first longitudinal electrode 121 and the second longitudinal electrode 131 are respectively disposed at two bisecting points of the substrate 110 along the circumferential direction.

[0106] At each location where a longitudinal electrode extends from a transverse electrode, two symmetrically arranged transverse electrodes extend in different directions, and the two transverse electrodes extend toward the other longitudinal electrode in an embracing manner. The ends of the transverse electrodes are spaced apart from the other longitudinal electrodes to insulate the ends of the transverse electrodes from the other longitudinal electrodes.

[0107] The embodiment of the present application also provides a heating tube 100. Referring to Figure 1, the heating tube 100 includes a substrate 110 and a conductive film layer 140. A housing cavity 111 is defined in the substrate 110, and the housing cavity 111 is used to accommodate at least part of the aerosol generating product. After the aerosol generating product 101 is heated, the aerosol generated flows out from the top of the substrate 110. The substrate 110 includes at least a first section 1123 and a second section 113 that are adjacent to each other in the axial direction. The first section 112 is arranged near the top of the substrate 110, and the second section 113 is located below the first section 112 in the axial direction and is arranged adjacent to the first section 112. A plurality of heating sections 112 are axially provided on the substrate 110. The conductive film layer 140 is provided on each heating section 112. The current in the conductive film layer 140 of each heating section 112 flows along the axial direction of the substrate 110, so that each heating section 112 generates heat. The temperature of the first section 112 is higher than that of the second section 113, allowing the tobacco near the upper portion of the heating tube 100 to quickly reach the atomization temperature, ensuring sufficient smoke volume in the first few puffs. The tobacco near the middle and lower portions heats up more slowly, effectively slowing the formation and upward diffusion of water vapor there, thereby reducing the temperature of the smoke in the first few puffs.

[0108] In addition, the arrangement of the first electrode 120 and the second electrode 130 in the embodiment of the present application allows the current in the heating section of the heating tube 100 to flow axially. This arrangement is suitable for a short and thick substrate, which helps to reduce the resistance of the conductive film layer 140 in the heating section and improve the heating rate of the heating section. The short and thick substrate herein can be understood as: the inner diameter of the substrate 110 is between 6mm and 15mm, or between 7mm and 15mm, or between 7mm and 14mm, or between 7mm and 12mm, or between 7mm and 10mm; the axial extension length of the substrate 110 is between 15mm and 30mm, or between 15mm and 28mm, or between 15mm and 25mm, or between 16mm and 25mm, or between 18mm and 25mm, or between 18mm and 24mm, or between 18mm and 22mm. The substrate 110 of the above dimensions is suitable for a short and thick aerosol-generating article 101.

[0109] The present application also provides an aerosol generating device. As shown in FIG9 , the aerosol generating device 10 includes the aforementioned heating tube 100 and a power supply 200 . The power supply 200 is used to power the heating tube 100 . The first electrode 120 and the second electrode 130 of the heating tube 100 are connected to the power supply 200 .

[0110] Obviously, the above embodiments of the present application are merely examples for the purpose of clearly illustrating the present application, and are not intended to limit the embodiments of the present application. A person skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present application. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the claims of the present application.

Claims

1. A heating tube, characterized in that: include: A substrate, wherein a receiving cavity is defined in the substrate, the receiving cavity is used to receive at least part of the aerosol generating product, and the aerosol generated by the aerosol generating product after being heated flows out from the top of the substrate, the substrate at least comprising a first section and a second section adjacently arranged in the axial direction, the first section being arranged close to the top of the substrate; A conductive film layer is disposed on at least a partial surface of the substrate; A first electrode, comprising a first longitudinal electrode arranged along the axial direction of the substrate, and at least one first transverse electrode, wherein the first transverse electrode extends from the first longitudinal electrode along the circumferential direction of the substrate; A second electrode, comprising a second longitudinal electrode arranged along the axial direction of the substrate, and at least one second transverse electrode, wherein the second transverse electrode extends from the second longitudinal electrode along the circumferential direction of the substrate; The first lateral electrode and the second lateral electrode disposed adjacent to each other are electrically connected to the conductive film layer therebetween to form a heating section; Wherein, the heating rate of the first section is greater than the heating rate of the second section.

2. The heating tube according to claim 1, characterized in that: The first section includes a first heating section, and the second section includes a second heating section. Currents of the first heating section and the second heating section flow in the conductive film layer between the first lateral electrode and the second lateral electrode, so that the first heating section and the second heating section generate heat.

3. The heating tube according to claim 2, characterized in that: The length L1 of the first heating section along the axial direction is smaller than the length L2 of the second heating section along the axial direction.

4. The heating tube according to claim 3, characterized in that: L2 is 1.5 to 2 times of L1.

5. The heating tube according to claim 3, characterized in that: The length of the first heating section along the axial direction is 5 to 15 mm.

6. The heating tube according to claim 2, characterized in that: The first lateral electrode or the second lateral electrode disposed between the first heating segment and the second heating segment is a common electrode, and the common electrode is connected to the conductive film layer of the first heating segment and the conductive film layer of the second heating segment respectively; or The first transverse electrode and the second transverse electrode disposed between the first heating segment and the second heating segment are spaced apart from each other so as to insulate the first transverse electrode from the second transverse electrode.

7. The heating tube according to claim 2, characterized in that: The substrate also includes a third section arranged adjacent to the second section, and the third section includes a third heating section. The current of the third heating section flows in the conductive film layer between the first lateral electrode and the second lateral electrode, so that the third heating section generates heat.

8. The heating tube according to claim 7, characterized in that: The relationship among the axial length L1 of the first heating section, the axial length L2 of the second heating section and the axial length L3 of the third heating section is as follows: L1<L3<L2.

9. The heating tube according to claim 1, characterized in that: The first section includes a first heating section, and a current of the first heating section flows in the conductive film layer between the first lateral electrode and the second lateral electrode, so that the first heating section generates heat; Wherein, one of the first transverse electrode and the second transverse electrode of the first heating section is a wide electrode, and the other is a narrow electrode, and the wide electrode is arranged in the second section.

10. The heating tube according to claim 9, characterized in that: The substrate further includes a third section disposed 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.

11. The heating tube according to claim 9, characterized in that: The axial length of the wide electrode is 2 to 10 mm.

12. The heating tube according to any one of claims 1 to 11, characterized in that: The conductive film layers are continuously arranged in the axial direction.

13. The heating tube according to claim 1, characterized in that: The first section includes a first heating section, and a current of the first heating section flows in the conductive film layer between the first lateral electrode and the second lateral electrode, so that the first heating section generates heat; Wherein, the second section is not provided with the conductive film layer.

14. The heating tube according to claim 1, characterized in that: The first section includes a first heating section, and a current of the first heating section flows in the conductive film layer between the first lateral electrode and the second lateral electrode, so that the first heating section generates heat; The conductive film layer is disposed discontinuously in the axial direction, and the second section is a discontinuous area of ​​the conductive film layer.

15. The heating tube according to claim 1, characterized in that: The first transverse electrodes and the second transverse electrodes are alternately arranged in the axial direction.

16. The heating tube according to claim 1, characterized in that: The first section includes a first heating section, and a current of the first heating section flows in the conductive film layer between the first lateral electrode and the second lateral electrode, so that the first heating section generates heat; The second section is provided with a conductive film layer and two first lateral electrodes. Or two of the second transverse electrodes, the conductive film layer is respectively connected to the two of the first transverse electrodes, or is connected to the two of the second transverse electrodes.

17. The heating tube according to claim 16, characterized in that: The substrate further includes a third section disposed adjacent to the second section, the third section including a third heating section, and current of the third heating section flows in the conductive film layer between the first lateral electrode and the second lateral electrode, causing the third heating section to generate heat.

18. The heating tube according to claim 17, characterized in that: Starting from the top of the substrate, the first transverse electrode and the second transverse electrode are arranged in sequence in the axial direction as follows: a first horizontal electrode, a second horizontal electrode, a second horizontal electrode and a first horizontal electrode; or The second horizontal electrode, the first horizontal electrode, the first horizontal electrode, and the second horizontal electrode.

19. The heating tube according to claim 16, characterized in that: The conductive film layers are continuously arranged in the axial direction.

20. The heating tube according to claim 1, characterized in that The first longitudinal electrode and the second longitudinal electrode are spaced apart from the conductive film layer, so that the first longitudinal electrode, the second longitudinal electrode and the conductive film layer are insulated from each other.

21. The heating tube according to claim 1, characterized in that: The first longitudinal electrode and the second longitudinal electrode are respectively arranged at two bisecting points of the substrate along the circumferential direction.

22. The heating tube according to claim 1, characterized in that The circumferential length of the first longitudinal electrode and the second longitudinal electrode is 1 to 5 mm; or, the axial length of the first transverse electrode and the second transverse electrode is 0.5 to 2 mm; or, the circumferential length of the interval between the longitudinal electrode and the conductive film layer is 0.2 to 2 mm.

23. A heating tube, characterized in that: include: A substrate, wherein a receiving cavity is defined in the substrate, the receiving cavity is used to receive at least part of the aerosol generating product, and the aerosol generated by the aerosol generating product after being heated flows out from the top of the substrate, the substrate at least comprising a first section and a second section adjacently arranged in the axial direction, the first section being arranged close to the top of the substrate; The base body is provided with a plurality of heating sections along the axial direction; A conductive film layer is provided at each of the heating segments, and the current of the conductive film layer flows along the axial direction to make the heating segment generate heat; Wherein, the temperature of the thermal field of the first section is higher than the temperature of the thermal field of the second section.

24. An aerosol generating device, characterized in that: The heating tube comprises a heating tube as claimed in any one of claims 1 to 23, and further comprises a power supply, wherein the power supply is used to supply power to the heating tube.

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