阅读说明：本技术 发热管及其制造方法和气溶胶产生装置 (Heating tube, method for manufacturing the same, and aerosol generating apparatus ) 是由 周宏明 李日红 李欢喜 朱彩强 杜贤武 于 2020-12-29 设计创作，主要内容包括：本发明涉及一种发热管及其制造方法和气溶胶产生装置。该发热管的制造方法包括：S1、制备管状坯体,所述管状坯体包括基体坯体、设置于所述基体坯体内侧的电热坯料层以及设置于所述电热坯料层内侧的红外辐射坯料层；S2、将所述管状坯体烧结成型。发热管采用烧结的方式一体成型,结构简单,可靠性高。电热层、红外辐射层设置于基体管内表面,电热层与红外辐射层直接接触激发辐射,大幅提高辐射加热比,缩短电热层、红外辐射层与气溶胶产生基质之间的加热传导距离和辐射距离,提高加热效率和加热均匀性。(The invention relates to a heating tube, a manufacturing method thereof and an aerosol generating device. The manufacturing method of the heating tube comprises the following steps: s1, preparing a tubular blank, wherein the tubular blank comprises a base blank body, an electric heating blank layer arranged on the inner side of the base blank body and an infrared radiation blank layer arranged on the inner side of the electric heating blank layer; and S2, sintering and molding the tubular blank. The heating tube is integrally formed in a sintering mode, and is simple in structure and high in reliability. The electric heating layer and the infrared radiation layer are arranged on the inner surface of the base tube, the electric heating layer is in direct contact with the infrared radiation layer to excite radiation, the radiation heating ratio is greatly improved, the heating conduction distance and the radiation distance between the electric heating layer and the aerosol generation substrate are shortened, and the heating efficiency and the heating uniformity are improved.)

1. A method for manufacturing a heating tube is characterized by comprising the following steps:

s1, preparing a tubular blank (10), wherein the tubular blank (10) comprises a base blank (110), an electric heating blank layer (140) arranged on the inner side of the base blank (110) and an infrared radiation blank layer (150) arranged on the inner side of the electric heating blank layer (140);

s2, sintering and molding the tubular blank (10).

2. The manufacturing method according to claim 1, wherein the step S1 includes:

s101, preparing a sheet-shaped matrix blank (110) through a tape casting process;

s102, preparing a sheet-shaped electric heating blank layer (140) on the sheet-shaped base body blank (110);

s103, preparing a sheet-shaped infrared radiation blank layer (150) on the sheet-shaped electric heating blank layer (140);

s104, curling the sheet-shaped substrate blank (110), the sheet-shaped electric heating blank layer (140) and the sheet-shaped infrared radiation blank layer (150) into a tubular shape.

3. The manufacturing method according to claim 1, wherein the tubular blank (10) further comprises a primer layer blank (180) disposed between the base blank (110) and the electrically heated blank layer (140);

the step S1 includes:

s111, preparing a sheet base layer blank (180) through a tape casting process;

s112, preparing a sheet-shaped electric heating blank layer (140) on the sheet-shaped base layer blank body (180);

s113, preparing a sheet-shaped infrared radiation blank layer (150) on the sheet-shaped electric heating blank layer (140);

s114, curling the sheet-shaped base coat blank (180), the sheet-shaped electric heating blank layer (140) and the sheet-shaped infrared radiation blank layer (150) into a tubular shape;

s115, putting the base layer blank (180), the electric heating blank layer (140) and the infrared radiation blank layer (150) which are curled into a tubular shape into a mould to form an outer layer in an injection molding mode to form the base body blank (110).

4. The manufacturing method according to claim 3, wherein the sheet-like base layer green body (180) is made of a high heat resistance porous ceramic material, and the thickness of the sheet-like base layer green body (180) is 10-40 um.

5. The manufacturing method according to claim 1, wherein the tubular body (10) further comprises a reflective green material layer (120) and an insulating green material layer (130), and the reflective green material layer (120), the insulating green material layer (130), the electrothermal green material layer (140), and the infrared radiation green material layer (150) are provided in this order inside the tubular body (10).

6. The manufacturing method according to claim 5, wherein the step S1 includes:

s121, preparing a sheet-shaped matrix blank (110) through a tape casting process;

s122, preparing a sheet-shaped reflecting blank layer (120) on the sheet-shaped substrate blank (110);

s123, preparing a sheet-shaped insulating blank layer (130) on the sheet-shaped reflecting blank layer (120);

s124, preparing a sheet-shaped electric heating blank layer (140) on the sheet-shaped insulating blank layer (130);

s125, preparing a sheet-shaped infrared radiation blank layer (150) on the sheet-shaped electric heating blank layer (140);

s126, curling the sheet-shaped substrate blank (110), the sheet-shaped reflecting blank layer (120), the sheet-shaped insulating blank layer (130), the sheet-shaped electric heating blank layer (140) and the sheet-shaped infrared radiation blank layer (150) into a tubular shape.

7. The manufacturing method according to claim 5, wherein the step S1 includes:

s131, preparing a sheet-shaped reflecting blank layer (120) through a tape casting process;

s132, preparing a sheet-shaped insulating blank layer (130) on the sheet-shaped reflecting blank layer (120);

s133, preparing a sheet-shaped electric heating blank layer (140) on the sheet-shaped insulating blank layer (130);

s134, preparing a sheet-shaped infrared radiation blank layer (150) on the sheet-shaped electric heating blank layer (140);

s135, coiling the sheet-shaped reflection blank layer (120), the sheet-shaped insulation blank layer (130), the sheet-shaped electric heating blank layer (140) and the sheet-shaped infrared radiation blank layer (150) into a tubular shape;

s136, placing the reflection blank layer (120), the insulation blank layer (130), the electric heating blank layer (140) and the infrared radiation blank layer (150) which are curled into a tubular shape into a mould to be injected and coated to form the base body blank (110).

8. The manufacturing method according to claim 5, wherein the reflective green layer (120) is made of a metal oxide paste or powder having a high reflectance, and the insulating green layer (130) is made of a non-conductive paste or powder.

9. The manufacturing method according to claim 5, wherein the reflective blank layer (120) is formed by casting or spray coating.

10. The manufacturing method according to claim 5, wherein the thickness of the reflective green layer (120) is 10-200 um.

11. The manufacturing method according to claim 5, characterized in that the insulating green layer (130) is formed by casting or spraying or screen printing.

12. The manufacturing method according to claim 5, wherein the thickness of the insulating green layer (130) is 5-40 um.

13. The manufacturing method according to any one of claims 1 to 12, wherein the base body (110) is made of a porous ceramic material having a high thermal resistance.

14. The manufacturing method as claimed in any one of claims 1 to 12, wherein in the step S2, the sintering temperature is 600-1600 ℃.

15. A manufacturing method according to any one of claims 1-12, characterized in that the electrically heated green layer (140) is made by screen printing or PVD deposition.

16. A manufacturing method according to any one of claims 1 to 12, characterized in that the electrically heated blank layer (140) includes an electrically conductive line (141) and a heat generating film (142), and the electrically conductive line (141) has a resistivity smaller than that of the heat generating film (142).

17. The method according to any one of claims 1 to 12, wherein the infrared radiation green layer (150) is made of Fe₂O₃、MnO₂、Co₂O₃、ZrO₂、SiO₂、SiC、TiO₂、Al₂O₃、CeO₂、La₂O₃MgO, cordierite, perovskite.

18. The manufacturing method according to any one of claims 1 to 12, wherein the thickness of the electrically heating green layer (140) is 20 to 100um, and the thickness of the infrared radiation green layer (150) is 10 to 200 um.

19. A heating tube, characterized in that the heating tube is manufactured by the manufacturing method of any one of claims 1 to 18.

20. An aerosol generating device comprising the heat generating tube of claim 19.

Technical Field

The present invention relates to the field of atomization, and more particularly, to a heating tube, a method of manufacturing the same, and an aerosol generating apparatus.

Background

The heating non-combustion type atomizer is an aerosol generator which heats an atomizing material to form an aerosol which can be sucked by a low-temperature heating non-combustion method. At present, different types of heating elements have been introduced at home and abroad, such as sheet-like, rod-like (needle-like) and tubular heating elements, for heating atomized materials.

The tubular heating body is formed by inserting an atomizing material into a heating tube, and after the resistance material on the surface of the tube wall of the heating tube is electrified, the resistance material gives off heat to heat the atomizing material in the heating tube and transfers heat in the atomizing material. The tubular heating body has large heating area and high heating uniformity due to the surrounding type, and is widely applied. At present, a heating circuit is generally arranged on the outer surface of a heating tube, a heating circuit is mostly manufactured by adopting a resistance wire process, and the forming process mode is single. In addition, the heating is mainly conducted by heat, the heating layer has a certain heat conduction distance with the atomizing material, the heat is dissipated to a certain extent, and the heating efficiency is reduced to a certain extent.

Disclosure of Invention

The present invention is directed to provide an improved heat generating tube, a method of manufacturing the same, and an aerosol generating apparatus.

The technical scheme adopted by the invention for solving the technical problems is as follows: a manufacturing method of constructing a heat generating tube includes the steps of:

s1, preparing a tubular blank, wherein the tubular blank comprises a base blank body, an electric heating blank layer arranged on the inner side of the base blank body and an infrared radiation blank layer arranged on the inner side of the electric heating blank layer;

and S2, sintering and molding the tubular blank.

In some embodiments, the step S1 includes:

s101, preparing a sheet-shaped matrix blank through a tape casting process;

s102, preparing a sheet-shaped electric heating blank layer on the sheet-shaped substrate blank;

s103, preparing a sheet-shaped infrared radiation blank layer on the sheet-shaped electric heating blank layer;

s104, curling the sheet-shaped substrate blank, the sheet-shaped electric heating blank layer and the sheet-shaped infrared radiation blank layer into a tubular shape.

In some embodiments, the tubular blank further comprises a strike layer blank disposed between the base blank and the electrically heated blank layer;

the step S1 includes:

s111, preparing a sheet base layer blank through a tape casting process;

s112, preparing a sheet-shaped electric heating blank layer on the sheet-shaped base layer blank;

s113, preparing a sheet-shaped infrared radiation blank layer on the sheet-shaped electric heating blank layer;

s114, curling the sheet-shaped base coat blank, the sheet-shaped electric heating blank layer and the sheet-shaped infrared radiation blank layer into a tubular shape;

s115, placing the base layer blank, the electric heating blank layer and the infrared radiation blank layer which are curled into a tubular shape into a mold for injection molding, and forming an outer layer to form the base body blank.

In some embodiments, the sheet-like base layer green body is made of a high heat resistance porous ceramic material, and the thickness of the sheet-like base layer green body is 10-40 um.

In some embodiments, the tubular blank further comprises a reflective blank layer and an insulating blank layer, and the reflective blank layer, the insulating blank layer, the electric heating blank layer and the infrared radiation blank layer are sequentially arranged on the inner side of the tubular blank.

In some embodiments, the step S1 includes:

s121, preparing a sheet-shaped matrix blank through a tape casting process;

s122, preparing a sheet-shaped reflecting blank layer on the sheet-shaped substrate blank;

s123, preparing a sheet-shaped insulating blank layer on the sheet-shaped reflecting blank layer;

s124, preparing a sheet-shaped electric heating blank layer on the sheet-shaped insulating blank layer;

s125, preparing a sheet-shaped infrared radiation blank layer on the sheet-shaped electric heating blank layer;

s126, curling the sheet-shaped substrate blank, the sheet-shaped reflection blank layer, the sheet-shaped insulation blank layer, the sheet-shaped electric heating blank layer and the sheet-shaped infrared radiation blank layer into a tubular shape.

In some embodiments, the step S1 includes:

s131, preparing a sheet-shaped reflecting blank layer through a tape casting process;

s132, preparing a sheet-shaped insulating blank layer on the sheet-shaped reflecting blank layer;

s133, preparing a sheet-shaped electric heating blank layer on the sheet-shaped insulating blank layer;

s134, preparing a sheet-shaped infrared radiation blank layer on the sheet-shaped electric heating blank layer;

s135, curling the sheet-shaped reflection blank layer, the sheet-shaped insulation blank layer, the sheet-shaped electric heating blank layer and the sheet-shaped infrared radiation blank layer into a tubular shape;

s136, placing the reflection blank layer, the insulation blank layer, the electric heating blank layer and the infrared radiation blank layer which are curled into a tubular shape into a mould for injection molding, and placing the outer layer of the mould for injection molding to form the base body blank.

In some embodiments, the reflective green layer is made of a metal oxide paste or powder having a high reflectivity, and the insulating green layer is made of a non-conductive paste or powder.

In some embodiments, the reflective blank layer is formed by casting or spraying.

In some embodiments, the thickness of the reflective blank layer is 10-200 um.

In some embodiments, the insulating green layer is formed by casting or spraying or screen printing.

In some embodiments, the thickness of the insulating green layer is 5-40 um.

In some embodiments, the base body is made of a porous ceramic material with high thermal resistance.

In some embodiments, in the step S2, the sintering temperature is 600-1600 ℃.

In some embodiments, the electrically heated green layer is made by screen printing or PVD deposition.

In some embodiments, the electrically heated blank layer includes electrically conductive traces and a heat generating film, the electrically conductive traces having a resistivity less than a resistivity of the heat generating film.

In some embodiments, the infrared radiation blank layer is made of Fe₂O₃、MnO₂、Co₂O₃、ZrO₂、SiO₂、SiC、TiO₂、Al₂O₃、CeO₂、La₂O₃MgO, cordierite, perovskite.

In some embodiments, the thickness of the electrothermal green layer is 20-100um, and the thickness of the infrared radiation green layer is 10-200 um.

The invention also provides a heating tube which is manufactured by adopting any one of the manufacturing methods.

The invention also provides an aerosol generating device which comprises the heating tube.

The implementation of the invention has at least the following beneficial effects: the heating tube is integrally formed in a sintering mode, so that the structure is simple, and the reliability is high; the electric heating layer and the infrared radiation layer are arranged on the inner surface of the base tube, the electric heating layer is in direct contact with the infrared radiation layer to excite radiation, the radiation heating ratio is greatly improved, the heating conduction distance and the radiation distance between the electric heating layer and the aerosol generation substrate are shortened, and the heating efficiency and the heating uniformity are improved.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic perspective view of a heat pipe according to some embodiments of the present invention;

FIG. 2 is a schematic cross-sectional view of a heat generating tube according to a first embodiment of the present invention;

FIG. 3 is an exploded view of the heat generating tube shown in FIG. 2;

FIGS. 4 to 5 are schematic structural views of the heat generating tube of FIG. 2 in a first manufacturing process;

FIGS. 6 to 7 are schematic structural views in a second manufacturing process of the heat generating tube shown in FIG. 2;

FIG. 8 is an exploded view of a heat generating tube according to a second embodiment of the present invention;

FIG. 9 is a schematic sectional view of the heat generating tube shown in FIG. 8;

fig. 10 to 11 are schematic structural views in a third manufacturing process of the heat generating tube shown in fig. 9;

fig. 12 to 13 are schematic structural views in a fourth manufacturing process of the heat generating tube shown in fig. 9;

figure 14 is a schematic perspective view of an aerosol generating device according to some embodiments of the invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1-3, the heating tube 1 according to the first embodiment of the present invention may include a substrate tube 11, an electrothermal layer 14 disposed inside the substrate tube 11, an infrared radiation layer 15 disposed inside the electrothermal layer 14, and two electrode leads 16 electrically connected to the electrothermal layer 14. The heating tube 1 may be in a circular tube shape, and in other embodiments, it may also be in other shapes such as an oval tube shape, a square tube shape, and the like.

The base pipe 11 can be in a shape of a circular pipe and can be made of high-thermal-resistance porous ceramic materials such as porous diatomite and the like, and has the functions of heat insulation and insulation. Fe may be used for the infrared radiation layer 15₂O₃、MnO₂、Co₂O₃、ZrO₂、SiO₂、SiC、TiO₂、Al₂O₃、CeO₂、La₂O₃MgO, cordierite, perovskite. The thickness of the infrared radiation layer 15 may be 10 to 200um, preferably 10 to 80 um.

The thickness of the electrothermal layer 14 may be 20-100um, preferably 20-60 um. The electrothermal layer 14 may include conductive traces 141 disposed on the inner side wall of the substrate tube 11 and a heating film 142 disposed on the inner side wall of the substrate tube 11. The conductive lines 141 are primarily used to form a suitable conductive trace pattern to distribute the heating zones as desired. The heating film 142 is mainly used for heating after being electrified. The conductive circuit 141 and the heating film 142 can be made of different materials by silk-screen printing or PVD deposition. The conductive circuit 141 can be made of a material with a relatively low resistivity and less heat generation, and the heating film 142 can be made of a material with a relatively high resistivity and more heat generation.

As shown in fig. 4 to 5, the heat generating tube 1 can be manufactured by the following method:

s1, preparing a tubular blank body 10;

and S2, sintering and molding the tubular blank 10.

The tubular blank 10 may include a tubular substrate blank 110, a tubular electrothermal blank layer 140 disposed inside the tubular substrate blank 110, and a tubular infrared radiation blank layer 150 disposed inside the tubular electrothermal blank layer 140. The tubular base body blank 110, the tubular electrothermal blank layer 140, and the tubular infrared radiation blank layer 150 are sintered to form the base tube 11, the electrothermal layer 14, and the infrared radiation layer 15, respectively. The sintering temperature may be 600-1600 ℃. The two electrode leads 16 can be deposited or welded on the outer end faces of the two ends of the heating tube 1 by PVD before or after sintering.

Further, step S1 may include:

s101, preparing a sheet-shaped matrix blank 110 through a tape casting process, wherein the thickness of the sheet-shaped matrix blank 110 can be 0.6-3 mm;

s102, preparing a sheet-shaped electric heating blank layer 140 on the sheet-shaped substrate blank 110 through a silk-screen printing or PVD (physical vapor deposition) deposition process;

s103, preparing a sheet infrared radiation blank layer 150 on the sheet electric heating blank layer 140 through silk-screen printing or PVD deposition or tape casting;

s104, the sheet-shaped substrate blank 110, the sheet-shaped electric heating blank layer 140 and the sheet-shaped infrared radiation blank layer 150 are curled into a tubular shape through the mandrel 170 so as to respectively form the tubular substrate blank 110, the tubular electric heating blank layer 140 and the tubular infrared radiation blank layer 150, and the tubular infrared radiation blank layer 150 is positioned at the inner side.

In another embodiment, as shown in FIGS. 6-7, the tubular blank 10 may further include a tubular primer layer 180 disposed between the tubular substrate blank 110 and the tubular electrothermal blank layer 140. The tubular base body blank 110 and the tubular primer layer 180 together form the base tube 11 after sintering.

The tubular blank 10 may also be prepared by the following method:

s111, preparing a thin sheet-shaped base coat blank 180 for priming through a tape casting process, wherein the thickness of the sheet-shaped base coat blank 180 can be 10-40 um;

s112, preparing a sheet-shaped electric heating blank layer 140 on the sheet-shaped priming coat blank body 180 through a silk-screen printing or PVD (physical vapor deposition) deposition process;

s113, preparing a sheet infrared radiation blank layer 150 on the sheet electric heating blank layer 140 through silk-screen printing or PVD deposition or tape casting;

s114, curling the sheet-shaped base coat blank 180, the sheet-shaped electric heating blank layer 140 and the sheet-shaped infrared radiation blank layer 150 into a tubular shape through a mandrel 170 so as to respectively form a tubular base coat 180, a tubular electric heating blank layer 140 and a tubular infrared radiation blank layer 150, and enabling the tubular infrared radiation blank layer 150 to be positioned on the inner side;

s115, placing the tubular base coat blank 180, the tubular electric heating blank layer 140 and the tubular infrared radiation blank layer 150 into a mold for injection molding, and forming an outer layer to form the tubular base body blank 110, wherein the thickness of the tubular base body blank 110 can be 0.6-3 mm.

According to the method, the sheet-shaped base coat blank 180 is cast for base coating, so that the total thickness is thinner when the pipe is curled, and the curling butt joint process is relatively easy to control.

Fig. 8 to 9 show a heat generating tube 1 in a second embodiment of the present invention, and compared with the first embodiment, the heat generating tube 1 in this embodiment further includes a reflective layer 12 and an insulating layer 13. The reflecting layer 12, the insulating layer 13, the electrothermal layer 14 and the infrared radiation layer 15 are arranged inside the substrate tube 11 in sequence.

The reflecting layer 12 is arranged on the inner side wall of the substrate tube 11, and SnO can be adopted₂Radical, In₂O₃The base, ZnO base and composite doping materials thereof, and the like, and the reflecting layer 12 can be 10-200um thick. An insulating layer 13 disposed on the reflective layer 12 and the electrothermal layer14 to insulate the reflective layer 12 from the electrothermal layer 14. The insulating layer 13 can be ZrO or SiO₂、Al₂O₃The thickness of the non-conductive slurry or powder can be 5-40um, preferably 5-20 um.

As shown in fig. 10 to 11, the heat generating tube 1 can be manufactured by the following method:

s1, preparing a tubular blank body 10;

and S2, sintering and molding the tubular blank 10.

The tubular blank 10 may include a tubular substrate blank 110, a tubular reflective blank layer 120 disposed inside the tubular substrate blank 110, a tubular insulating blank layer 130 disposed inside the tubular reflective blank layer 120, a tubular electrothermal blank layer 140 disposed inside the tubular insulating blank layer 130, and a tubular infrared radiation blank layer 150 disposed inside the tubular electrothermal blank layer 140. The tubular substrate body 110, the tubular reflective blank layer 120, the tubular insulating blank layer 130, the tubular electrothermal blank layer 140, and the tubular infrared radiation blank layer 150 are sintered to form the substrate tube 11, the reflective layer 12, the insulating layer 13, the electrothermal layer 14, and the infrared radiation layer 15, respectively. The sintering temperature may be 600-1600 ℃.

Further, step S1 may include:

s121, preparing a sheet matrix blank 110 through a tape casting process;

s122, preparing a sheet-shaped reflecting blank layer 120 on the sheet-shaped substrate blank 110 through a tape casting or spraying process;

s123, preparing a sheet-shaped insulating blank layer 130 on the sheet-shaped reflecting blank layer 120 through a tape casting or spraying or silk-screen process;

s124, preparing a sheet-shaped electric heating blank layer 140 on the sheet-shaped insulating blank layer 130 through a silk-screen or PVD (physical vapor deposition) deposition process;

s125, preparing a sheet infrared radiation blank layer 150 on the sheet electric heating blank layer 140 through silk-screen printing or PVD deposition or tape casting;

s126, the sheet-shaped substrate blank 110, the sheet-shaped reflection blank layer 120, the sheet-shaped insulation blank layer 130, the sheet-shaped electric heating blank layer 140 and the sheet-shaped infrared radiation blank layer 150 are curled into a tubular shape through the mandrel 170 so as to respectively form the tubular substrate blank 110, the tubular reflection blank layer 120, the tubular insulation blank layer 130, the tubular electric heating blank layer 140 and the tubular infrared radiation blank layer 150, and the tubular infrared radiation blank layer 150 is positioned at the inner side.

As shown in fig. 12-13, the tubular blank 10 can also be prepared by:

s131, preparing a sheet-shaped reflecting blank layer 120 through a tape casting process;

s132, preparing a sheet-shaped insulating blank layer 130 on the sheet-shaped reflecting blank layer 120 through a tape casting or spraying or silk-screen process;

s133, preparing a sheet-shaped electric heating blank layer 140 on the sheet-shaped insulating blank layer 130 through a silk-screen or PVD (physical vapor deposition) deposition process;

s134, preparing a sheet infrared radiation blank layer 150 on the sheet electric heating blank layer 140 through silk-screen printing or PVD deposition or tape casting;

s135, curling the sheet-shaped reflecting blank layer 120, the sheet-shaped insulating blank layer 130, the sheet-shaped electric heating blank layer 140 and the sheet-shaped infrared radiation blank layer 150 into a tubular shape through a mandrel 170 so as to respectively form a tubular reflecting blank layer 120, a tubular insulating blank layer 130, a tubular electric heating blank layer 140 and a tubular infrared radiation blank layer 150;

s136, placing the tubular reflecting blank layer 120, the tubular insulating blank layer 130, the tubular electric heating blank layer 140 and the tubular infrared radiation blank layer 150 into a mould to be injected and molded into an outer layer to form the tubular base body blank 110.

As shown in fig. 14, the present invention further provides an aerosol generating device, which may be substantially square-cylindrical and includes a housing 2, a heat generating tube 1 disposed in the housing 2, and a battery disposed in the housing 2 and electrically connected to the heat generating tube 1. The aerosol-generating substrate 3 may be inserted into the housing 2 from the top of the housing 2 and extend into the heat generating tube 1. The heating tube 1 is electrified and heated to bake and heat the aerosol generating substrate 3, and aerosol which can be sucked by a user is formed. In some embodiments, the aerosol-generating substrate 3 may be a tobacco rod. It will be appreciated that the aerosol generating device is not limited to a square cylindrical shape, and may be other shapes such as a cylindrical shape.

The heating tube 1 of the present invention has at least the following advantages:

1. the heating tube 1 is integrally formed in a sintering mode, so that the structure is simple, and the reliability is high;

2. the electric heating layer 14 and the infrared radiation layer 15 are arranged on the inner surface of the substrate tube 11, the electric heating layer 14 and the infrared radiation layer 15 are in direct contact with each other to excite radiation, so that the radiation heating ratio is greatly improved, the heating conduction distance and the radiation distance between the electric heating layer 14 and the infrared radiation layer 15 and the aerosol generating substrate 3 are shortened, and the heating efficiency and the heating uniformity are improved;

3. the reflecting layer 12 is arranged in the base tube 11, radiation is directly reflected in the base tube 11, the radiation is reduced to escape to the outer side of the base tube 11, the surface temperature of the heating tube 1 is reduced, the improvement of the overall performance of the aerosol generating device and the use experience feeling are facilitated, meanwhile, the radiation divergence range is reduced, and the radiation utilization rate is improved.

It is to be understood that the above-described respective technical features may be used in any combination without limitation.

The above examples only express the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.