CN216293048U

CN216293048U - Heating assembly and aerosol generating device

Info

Publication number: CN216293048U
Application number: CN202122166828.2U
Authority: CN
Inventors: 刘宇航; 张蛟; 金鹤; 牛永斌; 李欢喜; 周宏明
Original assignee: Shenzhen Smoore Technology Ltd
Current assignee: Shenzhen Smoore Technology Ltd
Priority date: 2021-09-08
Filing date: 2021-09-08
Publication date: 2022-04-15
Anticipated expiration: 2031-09-08
Also published as: WO2023035851A1

Abstract

The utility model relates to a heating component and an aerosol generating device. The heating tube comprises a base tube, a medium layer and a heating circuit, the medium layer is wrapped on the outer surface of the base tube, the heating circuit is arranged on the medium layer, a heating cavity used for containing aerosol-generated substrate is formed in the base tube, and the outer contour and the inner contour of the cross section of the base tube are both non-circular. The structure of the heating assembly can realize flexible design of the heating circuit on the non-circular base pipe, and can realize full coverage or partial coverage of the heating circuit on the surface of the base pipe.

Description

Heating assembly and aerosol generating device

Technical Field

The utility model relates to the field of atomization, in particular to a heating assembly and an aerosol generating device.

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. Currently, the heating mode of the aerosol generating device is generally tubular peripheral heating or central embedded heating. Wherein tubular peripheral heating means that the heating element surrounds the aerosol-generating substrate. Existing heating assemblies typically include a heating tube and a heating circuit disposed on an outer surface of the heating tube. The heating tube is usually designed into a hollow round tube shape, after the aerosol generating substrate is inserted, the circle of the contour line of the cross section of the aerosol generating substrate is contacted and superposed or tangent with the circle of the inner wall of the heating tube, and the aerosol generating substrate cannot be obviously extruded to cause the condition of sudden change of the cross section shape. The heating line is mostly manufactured by adopting a resistance wire process, and the forming process mode is single.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to an improved heating assembly and an aerosol generating device having the same, which overcome the above-mentioned disadvantages of the prior art.

The technical scheme adopted by the utility model for solving the technical problems is as follows: constructing a heating assembly comprising a heating tube; the heating tube comprises a base tube, a medium layer and a heating circuit, the medium layer is wrapped on the outer surface of the base tube, the heating circuit is arranged on the medium layer, a heating cavity used for containing aerosol-generated substrate is formed in the base tube, and the outer contour and the inner contour of the cross section of the base tube are both non-circular.

In some embodiments, the dielectric layer is sintered integrally with the base tube.

In some embodiments, the dielectric layer is formed by rolling a film strip and then sintering.

In some embodiments, the film strip is formed by casting.

In some embodiments, the heating circuit is formed by printing conductive paste on the dielectric layer and then sintering the printed conductive paste.

In some embodiments, the base tube is made of a stainless steel base material, and the medium layer is made of medium glass.

In some embodiments, the dielectric layer has a coefficient of thermal expansion that matches a coefficient of thermal expansion of the base tube.

In some embodiments, the heating tube further comprises an infrared radiation layer disposed on an inner surface of the base tube, and the base tube is made of a highly thermally conductive metal or ceramic.

In some embodiments, the heating tube further comprises an infrared radiation layer disposed on an outer surface of the base tube, and the base tube is made of quartz glass.

In some embodiments, the cross-sectional outer and inner profiles of the substrate tube are substantially in the shape of a reuleaux polygon.

In some embodiments, the lyocell polygon comprises a lyocell triangle, a lyocell pentagon, or a lyocell heptagon.

In some embodiments, each intersection of two curved sides of the lyocell polygon is rounded.

In some embodiments, the arcuate edge of the lyocell polygon is used to compress the aerosol-generating substrate.

In some embodiments, the heating assembly further comprises a guide member connected to the heating tube, the guide member having an introduction chamber formed therein in communication with the heating chamber for introducing the aerosol-generating substrate.

In some embodiments, the ingression lumen has a first end distal from the heating lumen and a second end proximal to the heating lumen, the ingression lumen having a cross-sectional area at the first end that is greater than a cross-sectional area at the second end.

In some embodiments, the ingression lumen transitions from the first end to the second end.

The utility model also provides an aerosol generating device comprising a heating assembly as described in any of the above.

The implementation of the utility model has at least the following beneficial effects: the structure of the heating assembly can realize flexible design of the heating circuit on the non-circular base pipe, and can realize full coverage or partial coverage of the heating circuit on the surface of the base pipe.

Drawings

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

FIG. 1 is a perspective view of a heating element according to a first embodiment of the present invention;

FIG. 2 is an exploded view of the heating assembly of FIG. 1;

FIG. 3 is a schematic illustration of the heating assembly of FIG. 1 during a molding process;

figure 4 is a schematic cross-sectional view of the base tube of figure 2 containing an aerosol-generating substrate;

FIG. 5 is a schematic cross-sectional profile of the heating chamber of FIG. 4;

FIG. 6 is a ternary phase diagram of BaO-A12O3-SiO 2;

FIG. 7 is a schematic cross-sectional view of a substrate tube of a heating assembly according to a second embodiment of the utility model;

FIG. 8 is a perspective view of a heating element according to a third embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of the heating assembly of FIG. 8 during a molding process;

FIG. 10 is a perspective view of a heating element according to a fourth embodiment of the present invention;

FIG. 11 is a schematic longitudinal cross-sectional view of the heating assembly shown in FIG. 10;

FIG. 12 is a schematic cross-sectional view of the base tube of FIG. 10;

FIG. 13 is a perspective view of a heating element according to a fifth embodiment of the present invention;

FIG. 14 is a schematic cross-sectional view of the base tube of FIG. 13;

figure 15 is a schematic perspective view of an aerosol-generating device according to some embodiments of the utility model inserted with an aerosol-generating substrate;

figure 16 is a schematic longitudinal cross-sectional view of the aerosol-generating device of figure 15 inserted with an aerosol-generating substrate.

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. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings or the orientations and positional relationships that the products of the present invention will ordinarily place when in use, and are used merely for convenience in describing and simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Fig. 1-5 show a heating assembly 1 according to a first embodiment of the utility model, the heating assembly 1 comprising a heating tube 10, a heating cavity 110 being formed within the heating tube 10 for receiving and heating an aerosol-generating substrate 200. The heating pipe 10 may include a base pipe 11, a medium layer 12 coated on the surface of the base pipe 11, and a heating circuit 13 disposed on the medium layer 12.

The substrate tube 11 is tubular with a hollow interior, and the inner wall surface of the substrate tube 11 defines a heating chamber 110. The cross-sectional outer and inner profiles of the substrate tube 11 may each be non-circular, such as a polygon, including but not limited to a triangle, square, trapezoid, pentagon, etc. Preferably, the base tube 11 is substantially a reuleaux polygonal tube, i.e. the cross-sectional outer and inner profile of the base tube 11 are both substantially reuleaux polygons, such as reuleaux triangle, reuleaux pentagon or reuleaux heptagon, etc. The lyocell polygon is an equal-width curve and has an odd number of arc-shaped sides, and the odd number of arc-shaped inner wall surfaces of the base tube 11 can press the aerosol-generating substrate 200 accommodated in the base tube 11 and can have a larger contact area with the aerosol-generating substrate 200. Furthermore, since the lyocell polygon has the same width in any direction, the base tube 11 can maintain a constant width during one-plane rotation.

The cross-sectional inner contour of the substrate tube 11, i.e., the cross-sectional contour of the heating cavity 110, has a maximum inscribed circle C1. The diameter 2R of the maximum inscribed circle C1 is smaller than the outer diameter of the aerosol-generating substrate 200 before being pressed. In some embodiments, the diameter 2R of the largest inscribed circle may be 0.2-2.0mm smaller than the outer diameter of the aerosol-generating substrate 200 before being extruded. The maximum inscribed circle C1 may have a diameter 2R of 3 to 9mm, preferably 4 to 7 mm. Upon insertion of the aerosol generating substrate 200 into the heating chamber 110, at least part of the chamber wall of the heating chamber 110 is able to compress the aerosol generating substrate 200, causing the aerosol generating substrate 200 to deform radially inwardly. Fig. 4 is a cross-sectional view of a generally cylindrical aerosol-generating substrate 200 housed within the substrate tube 11, wherein the dotted line represents the outer contour of the cross-section of the aerosol-generating substrate 200 before extrusion. After the aerosol-generating substrate 200 is crushed and deformed, the radial surface-to-center distance is reduced, thereby shortening the heat transfer distance. Meanwhile, the air inside the aerosol-generating substrate 200 is extruded and discharged, and the density of the atomized substrate inside the aerosol-generating substrate 200 is increased, so that the heat conduction efficiency can be improved, and the problems of large surface temperature difference, low heat conduction efficiency and long preheating time of the aerosol-generating substrate 200 are solved. It will be appreciated that the greater the number of edges of the cross-sectional profile of the heating chamber 110, the closer the cross-sectional profile of the heating chamber 110 approaches a circle. In order to effectively provide some compression of the aerosol-generating substrate 200, the number of edges of the cross-sectional profile of the heating chamber 110 should not be excessive. Preferably, the base tube 11 is a rilo triangular tube or a rilo pentagonal tube. In this embodiment, the base tube 11 is a lyocell tube.

The maximum distance L from the center of the maximum inscribed circle C1 to the cross-sectional profile line of the heating cavity 110 is greater than the radius R of the maximum inscribed circle C1. When the aerosol-generating substrate 200 is received in the heating chamber 110, at least one airflow channel 111 may be formed between the outer wall surface of the aerosol-generating substrate 200 and the wall surface of the heating chamber 110, and the at least one airflow channel 111 may extend in the axial direction of the heating chamber 110, so as to ensure smooth airflow during smoking. In some embodiments, the maximum distance L from the center of the maximum inscribed circle C1 to the cross-sectional profile of the heating cavity 110 may be greater than 2mm, preferably 3-5 mm. In this embodiment, there are three air flow passages 111, and the three air flow passages 111 are respectively located at the junction of every two arc-shaped edges of the heating cavity 110.

The medium layer 12 may be formed by winding the film tape 120 around the outer surface of the substrate tube 11 and then sintering, wherein the film tape 120 may be a casting film tape formed by casting. Specifically, during the manufacturing of the heating module 1, the base pipe 11 may be rotated under a force to adhere the roll film tape 120 for forming the medium layer 12. Because the outer contour of the cross section of the base pipe 11 is an equal-width curve, the base pipe 11 always keeps tangent with the film rolling belt 120 in the rotating process, so that the bubble removal in the film rolling process is facilitated, the film rolling bubbles can be effectively avoided, the yield is improved, and the defects of film rolling, film pulling, cracking and the like caused by unstable pressure in the film rolling process can be avoided. In addition, a rounding off angle 112 can be arranged at the joint of every two arc edges of the cross section outline of the base pipe 11, and the rounding off degree of the joint is improved through proper rounding off, and meanwhile, the equal-width characteristic is kept, so that the process stability and the yield are further improved.

The heating line 13 may be formed by printing the conductive paste 130 on the film tape 120 and then sintering the printed conductive paste. The film tape 120 printed with the conductive paste 130 is wrapped on the outer surface of the base pipe 11, and the medium layer 12 formed after sintering is attached to the outer surface of the base pipe 11. The heating circuit 13 is flexible in design, the heating circuit 13 can be positioned on the outer surface of the medium layer 12, or positioned between the inner surface of the medium layer 12 and the outer surface of the substrate tube 11, and in addition, the heating circuit 13 can be completely covered or partially covered on the surface of the substrate tube 11.

In the present embodiment, the heating assembly 1 is heated by pure resistance conduction heating. The heating circuit 13 is located outside the base tube 11, and the heating circuit 13 heats the aerosol-generating substrate 200 by transferring heat from the outer surface of the base tube 11 to the aerosol-generating substrate 200 accommodated in the base tube 11 after being energized to generate heat. The substrate tube 11 can be made of metal or nonmetal materials with high heat conductivity coefficient, which is beneficial to the rapid heat transfer, and the uniformity of the temperature field of the substrate tube 11 is better under the rapid temperature rise. The metal material with high thermal conductivity may be stainless steel, aluminum or aluminum alloy, copper or copper alloy, etc., preferably 430 stainless steel. The high thermal conductivity non-metallic material may be a ceramic, such as alumina, silicon carbide, aluminum nitride, silicon nitride, and the like.

The dielectric layer 12 has good insulation properties and can be used to form effective circuit connections by thick film printing and sintering. The dielectric material selected by the dielectric layer 12 needs to have good co-firing matching with the conductive paste printed on the surface, and has good thermal matching and thermal shock resistance. In addition, the dielectric material can be sintered and combined with the surface of the base material of the base pipe 11 at a low temperature, and the thermal expansion coefficient of the dielectric material is matched with that of the base material of the base pipe 11. In this embodiment, the base tube 11 is made of 430 stainless steel base material, and the medium layer 12 is made of medium glass.

Preferably, the dielectric layer 12 also has a certain resistance to mechanical and thermal shock, which can be obtained by adding oxides, such as oxides of Fe, Co, Ni, etc., to the base glass, such as Co2O 3. The addition of Fe, Co, Ni and other oxides to the base glass can improve the wettability of the dielectric layer 12 and the stainless steel substrate, and these elements can form a chemical bond with the stainless steel substrate during the firing process to improve the bonding strength.

Based on the requirement of thermal expansion matching of the dielectric layer 12 and the stainless steel substrate, a BaO-A12O3-SiO2 system can be added into the substrate glass or a system of CaO replacing part of BaO can be selected, and the thermal expansion coefficient of the dielectric layer 12 can be adjusted. As shown in FIG. 6, according to the ternary phase diagram of BaO-A12O3-SiO2, the proportion of the main components can be selected near the celsian region, and the approximate proportion of barium-aluminum-silicon-oxide in the dielectric glass can be as follows: 30-60% of BaO, 10-30% of A12O3 and 15-50% of SiO 2. The dielectric glass may further include a crystal nucleating agent, such as one or more of TiO2, ZrO2, CaF2, and the like. In addition, the dielectric glass can also comprise alkali metal oxides, alkaline earth metal oxides and the like which are used for regulating the glass performance, such as Na2O, K2O, CaO, MgO, BaO, Al2O3, ZnO and the like, and further can also comprise B2O3 which is used for reducing the melting temperature of the glass and regulating the softening temperature of the glass. In some embodiments, the dielectric glass has a composition ratio of: 75-90% of base glass, 5-10% of B2O3, 1-3% of nucleating agent, 0.5-2% of oxides of Fe, Co and Ni, and 3-10% of other alkali metal oxides and alkaline earth metal oxides. The low-temperature treatment temperature of the dielectric layer 12 is preferably 800-900 ℃, the dielectric layer 12 can be combined with a stainless steel substrate and can endure a 350 ℃ room temperature water quenching test, and the low-temperature treatment temperature can withstand 8000 times of long-time cyclic test of raising the temperature to 350 ℃ and then lowering the temperature for 1min for 2 min.

Figure 7 shows a schematic cross-sectional view of a substrate tube 11 according to a second embodiment of the utility model, which differs from the first embodiment mainly in that the substrate tube 11 according to the present embodiment has a cross-sectional profile in the shape of a reuleaux triangle, and in that there is a direct connection between each two curved sides, i.e. no chamfer at the junction of the two curved sides, so that there is a sharp corner at the junction.

Fig. 8 to 9 show a heating element 1 according to a third embodiment of the present invention, which differs from the first embodiment mainly in that the heating element 1 according to the present embodiment is a prolate tube, and the cross-sectional outer contour and the inner contour of the substrate tube 11 are both prolate pentagons. In addition, the junction of every two arc-shaped sides of the cross-sectional profile of the base pipe 11 can be properly rounded, improving the smoothness of the junction.

Fig. 10-12 show a heating assembly 1 according to a fourth embodiment of the utility model, which differs from the first embodiment mainly in that the heating assembly 1 according to the present embodiment further comprises a guiding member 20 located at an upper portion of the heating tube 10 for guiding an aerosol-generating substrate 200 and a support wall 30 covering a bottom portion of the heating tube 10 for axial supporting positioning of the aerosol-generating substrate 200. The guide member 20, the heating tube 10, and the support wall 30 may be integrally formed, or may be separately formed and then assembled.

Furthermore, in the present embodiment, the base tube 11 is a regular triangular tube, i.e. both the inner contour and the outer contour of the cross section of the base tube 11 are regular triangular prisms, which have three straight edges. The junction of each two edges of the cross-sectional profile of the substrate tube 11 may also be provided with a rounded corner 112 to improve the smoothness of the junction. It is understood that in other embodiments, the inner and outer cross-sectional profiles of the base pipe 11 may be other regular polygons such as a regular quadrangle, a regular pentagon, and a regular hexagon. In order to effectively provide some compression of the aerosol-generating substrate 200, the number of edges of the cross-sectional profile of the base tube 11 is not necessarily excessive, and in some embodiments may be 3-7.

In addition, the heating assembly 1 in this embodiment may adopt a heating mode of resistance conduction and infrared radiation combined heating, and the heating tube 10 includes an infrared radiation layer 14 in addition to the base tube 11, the medium layer 12 and the heating circuit 13. The infrared radiation layer 14 may be disposed on the inner surface of the substrate tube 11, and in this case, the substrate tube 11 may be made of a metal or non-metal material having a high thermal conductivity. The metal material with high thermal conductivity may be stainless steel, aluminum or aluminum alloy, copper or copper alloy, etc., preferably 430 stainless steel. The high thermal conductivity non-metallic material may be a ceramic, such as alumina, silicon carbide, aluminum nitride, silicon nitride, and the like. In other embodiments, the infrared radiation layer 14 may be disposed on the outer surface of the substrate tube 11, and in this case, the substrate tube 11 may be made of quartz or the like with high infrared transmittance.

The support wall 30 covers the lower opening of the heating tube 10 and may be integrally formed with the heating tube 10. The inner side wall of the heating tube 10 and/or the upper side wall of the support wall 30 may also be provided with at least one limiting boss 31 for limiting the aerosol-generating substrate 200. The at least one limiting projection 31 and the heating tube 10 and/or the support wall 30 may be integrally formed, or they may be separately formed and then assembled together by welding or the like. In this embodiment, there is one limiting projection 31, and the one limiting projection 31 may be integrally formed by bending the supporting wall 30 upward and may coincide with the central axis of the supporting wall 30. The top surface of the limiting projection 31 is a plane, and the lower end surface of the aerosol-generating substrate 200 can be supported and positioned against the at least one limiting projection 31. In other embodiments, there may be two or more limiting bosses 31, and the two or more limiting bosses 31 may be distributed on the periphery of the supporting wall 30 and may be uniformly spaced along the circumference of the supporting wall 30.

The guide member 20 is tubular with a hollow interior, and the inner wall surface of the guide member 20 defines an introduction chamber 210 for introducing the aerosol-generating substrate 200. The introduction chamber 210 has a first end 211 distal from the heating tube 10 and a second end 212 proximal to the heating tube 10. The cross-sectional area of the ingression lumen 210 at the first end 211 is greater than the cross-sectional area at the second end 212 and the cross-sectional area of the ingression lumen 210 at the first end 211 is not less than the cross-sectional area of the aerosol-generating substrate 200 prior to extrusion. In this embodiment, the cross-sectional shape of the introduction chamber 210 at the first end 211 corresponds to the cross-sectional shape of the aerosol generating substrate 200, i.e. the cross-sectional shape of the introduction chamber 210 at the first end 211 is circular and the cross-sectional area of the introduction chamber 210 at the first end 211 is larger than the cross-sectional area of the aerosol generating substrate 200 before it is squeezed, facilitating a smooth introduction of the aerosol generating substrate 200 into the heating assembly 1.

The shape of the cross-section of the ingression lumen 210 at the second end 212 matches the cross-sectional shape of the heating lumen 110 and is different from the cross-sectional shape of the first end 211. In this embodiment, the cross-sectional shape of the ingression lumen 210 at the second end 212 is generally a right triangular prism with a rounded transition. The second end 212 of the introduction chamber 210 is coupled to the upper end of the heating chamber 110 and the second end 212 of the introduction chamber 210 has a cross-sectional dimension that corresponds to the cross-sectional dimension of the heating chamber 110. The introduction chamber 210 may have a gradual transition from the first end 211 to the second end 212, i.e., the cross-section of the introduction chamber 210 gradually changes from a circular shape at the first end 211 to a regular triangular shape corresponding to the cross-section of the heating tube 10, and then joins the heating chamber 110. The aerosol-generating substrate 200 is smoothly inserted into the heating tube 10 via the guiding function of the guiding member 20 while being pressed radially inward by the heating tube 10 into a triangular shape similar to the cross-sectional shape of the heating chamber 110. When the aerosol-generating substrate 200 is received in the heating tube 10, three air flow passages 111 may be formed between the outer wall surface of the aerosol-generating substrate 200 and the wall surface of the heating chamber 110, and the three air flow passages 111 are respectively located at the connection of every two edges of the heating chamber 110.

Figures 13 to 14 show a heating module 1 according to a fifth embodiment of the utility model which differs from the fourth embodiment primarily in that the substrate tube 11 in this embodiment is of racetrack circular cross-section both in its outer and inner profile, the largest inscribed circle C1 of the cross-sectional profile of the heating chamber 110 has a diameter 2R which corresponds to the length of the minor axis of the racetrack circular cross-sectional inner profile and the largest distance L from the centre of this inscribed circle C1 to the cross-sectional profile of the heating chamber 110 corresponds to the radius of the major axis of the racetrack circular cross-sectional inner profile. When the aerosol-generating substrate 200 is received in the heating chamber 110, two air flow passages 111 may be formed between the outer wall surface of the aerosol-generating substrate 200 and the wall surface of the heating chamber 110, the two air flow passages 111 being located on either side of the long axis of the heating chamber 110. It will be appreciated that in other embodiments the cross-section of the heating chamber 110 may be other non-circular shapes, preferably axisymmetric non-circular shapes.

Accordingly, the cross-sectional shape of the second end 212 of the introduction chamber 210 communicating with the heating chamber 110 is a racetrack circle that conforms to the cross-sectional shape of the heating chamber 110. The cross-sectional shape of the first end 211 of the ingression lumen 210 may be circular and the cross-sectional shape of the ingression lumen 210 tapers from the circular shape of the first end 211 to a racetrack circular shape of the second end 212.

In addition, in the embodiment, the heating module 1 may further have a plurality of through holes 113 communicating with the heating cavity 110 and the introducing cavity 210. The through hole 113 may be opened at any position of the heating element 1 as required. For example, the through hole 113 may be opened on the side wall of the guide member 20 and/or the heating pipe 10, and/or the through hole 113 may be opened on the support wall 30 and/or the limit projection 31. The shape, size and number of the through holes 113 are not limited.

Figures 15-16 illustrate an aerosol generating device 100 according to some embodiments of the utility model, which aerosol generating device 100 may be generally rectangular in cylindrical shape and may include a housing 2 and a heating assembly 1, a main board 3 and a battery 4 disposed within the housing 2. The heating element 1 may adopt the heating element structure in any of the above embodiments. It is understood that in other embodiments, the aerosol generating device 100 is not limited to being rectangular and cylindrical, but may be other shapes such as square, cylindrical, elliptical, etc.

The top of the housing 2 is provided with a socket 20 for insertion of an aerosol generating substrate 200, the cross-sectional shape and dimensions of the socket 20 being adapted to the cross-sectional shape and dimensions of the aerosol generating substrate 200, the aerosol generating substrate 200 being insertable into the heating assembly 1 via the socket 20 into contact with the inner wall surface of the heating assembly 1. The heating assembly 1, when energised to generate heat, can transfer heat to the aerosol-generating substrate 200 to effect a toasting heating of the aerosol-generating substrate 200. The mainboard 3 is respectively electrically connected with the battery 4 and the heating assembly 1. The main board 3 is provided with a related control circuit, and the on-off between the battery 4 and the heating element 1 can be controlled by a switch 5 arranged on the shell 2. The top of the housing 2 may also be provided with a dust cover 6 for covering or uncovering the socket 20. When the aerosol generating device 100 is not required to be used, the dust cap 6 can be pushed to shield the socket 20, so as to prevent dust from entering the socket 20. When required for use, the dust cap 6 is pushed to expose the socket 20 so that the aerosol generating substrate 200 is inserted from the socket 20.

The aerosol-generating substrate 200 may comprise an outer wrapper 210 and an aerosol-generating substrate 220 disposed at the bottom within the outer wrapper 210. Wherein the outer wrapper 210 may be an outer wrapper. The nebulized matrix 220 may be a material used for medical or health purposes, for example, a plant-based material such as solid sheet or filament plant roots, stems, leaves, and the like. The aerosol-generating device 100 applies low-temperature baking heating to the aerosol-generating substrate 200 inserted therein to release the aerosol extract in the nebulized substrate 220 in a non-combustible state. Further, the aerosol-generating substrate 200 may further comprise a hollow support section 230, a cooling section 240 and a filtering section 250 disposed in the outer wrapper 210 and longitudinally above the aerosol-generating substrate 220 in that order. The cross-sectional shape of the aerosol-generating substrate 200 is also not limited to being circular, but may be oval, square, polygonal, and the like.

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.

Claims

1. A heating assembly, characterized by comprising a heating tube (10); the heating pipe (10) comprises a base pipe (11), a medium layer (12) coated on the outer surface of the base pipe (11) and a heating circuit (13) arranged on the medium layer (12), a heating cavity (110) used for containing aerosol generating substrates (200) is formed in the base pipe (11), and the outer contour and the inner contour of the cross section of the base pipe (11) are non-circular.

2. The heating assembly according to claim 1, characterized in that the medium layer (12) is sintered in one piece with the base tube (11).

3. The heating assembly of claim 1, wherein the dielectric layer (12) is formed by rolling a film tape (120) and then sintering.

4. The heating assembly according to claim 3, wherein the film strip (120) is formed by casting.

5. The heating element according to claim 1, wherein the heating line (13) is formed by printing a conductive paste (130) on the dielectric layer (12) and then sintering.

6. The heating assembly according to claim 1, wherein the base tube (11) is made of a stainless steel base material and the dielectric layer (12) is made of a dielectric glass.

7. The heating assembly according to claim 1, characterized in that the coefficient of thermal expansion of the dielectric layer (12) is matched to the coefficient of thermal expansion of the base tube (11).

8. The heating assembly according to claim 1, characterized in that the heating tube (10) further comprises an infrared radiation layer (14) arranged on the inner surface of the base tube (11), the base tube (11) being made of a highly heat conductive metal or ceramic.

9. The heating assembly according to claim 1, characterized in that the heating tube (10) further comprises an infrared radiation layer (14) arranged on the outer surface of the base tube (11), the base tube (11) being made of quartz glass.

10. The heating assembly according to claim 1, characterized in that the cross-sectional outer and inner contours of the substrate tube (11) are substantially of a reuleaux polygon.

11. The heating assembly of claim 10, wherein the lyocell polygon comprises a lyocell triangle, a lyocell pentagon, or a lyocell heptagon.

12. The heating assembly of claim 10, wherein each intersection of two arcuate sides of said reuleaux polygon is formed with a rounded corner (112).

13. A heating assembly according to claim 10, wherein the arcuate sides of the lyocell polygon are adapted to compress the aerosol-generating substrate (200).

14. A heating assembly according to any of claims 1-13, further comprising a guiding member (20) connected to the heating tube (10), wherein an introduction chamber (210) communicating with the heating chamber (110) for introducing the aerosol generating substrate (200) is formed in the guiding member (20).

15. The heating assembly of claim 14, wherein the ingression lumen (210) has a first end (211) distal from the heating lumen (110) and a second end (212) proximal to the heating lumen (110), the ingression lumen (210) having a cross-sectional area at the first end (211) that is greater than a cross-sectional area at the second end (212).

16. The heating assembly of claim 15, wherein the ingression lumen (210) is a gradual transition from the first end (211) to the second end (212).

17. An aerosol generating device comprising a heating assembly according to any one of claims 1 to 16.