WO2023035851A1

WO2023035851A1 - Heating assembly and preparation method therefor, and aerosol generating device

Info

Publication number: WO2023035851A1
Application number: PCT/CN2022/111890
Authority: WO
Inventors: 刘宇航; 张蛟; 金鹤; 牛永斌; 李欢喜; 周宏明
Original assignee: 深圳麦克韦尔科技有限公司
Priority date: 2021-09-08
Filing date: 2022-08-11
Publication date: 2023-03-16
Also published as: CN216293048U

Abstract

A heating assembly (1) and a preparation method therefor, and an aerosol generating device (100). The heating assembly (1) comprises a heating pipe (10). The heating pipe (10) comprises a base pipe (11), a dielectric layer (12) covering an outer surface of the base pipe (11), and a heating circuit (13) arranged on the dielectric layer (12), wherein a heating cavity (110) for accommodating an aerosol generating substrate (200) is formed in the base pipe (11), and both an outer contour and an inner contour of a cross section of the base pipe (11) are non-circular. By means of the structure of the heating assembly (1), flexible design of the heating circuit (13) on the non-circular base pipe (11) can be realized, and full coverage or partial coverage of the heating circuit (13) on the surface of the base pipe (11) can be realized.

Description

Heating component and its preparation method and aerosol generating device

technical field

The invention relates to the field of atomization, more specifically, to a heating assembly and an aerosol generating device.

Background technique

The heat-not-burn atomizing device is an aerosol generating device that heats the atomized material to form an inhalable aerosol by means of low-temperature heat-not-burn. At present, the heating methods of aerosol generating devices are usually tubular peripheral heating or central embedded heating. Wherein, tubular peripheral heating means that the heating element surrounds the aerosol generating matrix. Existing heating components usually include a heating tube and a heating circuit arranged on the outer surface of the heating tube. The heating tube is usually designed as a hollow circular tube. After inserting the aerosol-generating matrix, the circle where the contour line of the cross-section of the aerosol-generating matrix is located coincides with or is tangent to the circle on the inner wall of the heating tube, and the aerosol-generating matrix will not be significantly squeezed. However, there is a sudden change in the cross-sectional shape. The heating circuit is mostly made by resistance wire technology, and the molding process method is single.

technical problem

The technical problem to be solved by the present invention is to provide an improved heating assembly and an aerosol generating device with the heating assembly for the above-mentioned defects of the prior art.

technical solution

The technical solution adopted by the present invention to solve the technical problem is: construct a heating assembly, the heating assembly includes a heating tube; the heating tube includes a base tube, a medium layer coated on the outer surface of the base tube, and a For the heating circuit of the medium layer, a heating cavity for accommodating the aerosol generating substrate is formed in the base tube, and the outer and inner profiles 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 tape and then sintering it.

In some embodiments, the tape is cast by casting.

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

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

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

In some embodiments, the heating tube further includes an infrared radiation layer disposed on the inner surface of the base tube, and the base tube is made of metal or ceramics with high thermal conductivity.

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

In some embodiments, the cross-sectional outer and inner contours of the base tube are substantially Rello polygonal.

In some embodiments, the Lello polygons include Lello triangles, Lello pentagons, or Lello heptagons.

In some embodiments, rounded corners are formed at the joints of every two arc-shaped sides of the Lello polygon.

In some embodiments, the curved sides of the Lello polygon are used to squeeze the aerosol-generating substrate.

In some embodiments, the heating assembly further includes a guide component connected to the heating tube, and an introduction cavity for introducing the aerosol-generating substrate communicated with the heating cavity is formed in the guide component.

In some embodiments, the introduction cavity has a first end away from the heating cavity and a second end close to the heating cavity, and the cross-sectional area of the introduction cavity at the first end is larger than that at the second end. The cross-sectional area of both ends.

In some embodiments, the introduction cavity has a gradual transition from the first end to the second end.

The present invention also provides an aerosol generating device, comprising the heating assembly described in any one of the above.

Beneficial effect

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

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a schematic diagram of the three-dimensional structure of the heating assembly in the first embodiment of the present invention;

Fig. 2 is a schematic diagram of an exploded structure of the heating assembly shown in Fig. 1;

Fig. 3 is a structural schematic diagram during the molding process of the heating assembly shown in Fig. 1;

Fig. 4 is a schematic cross-sectional view of the substrate tube in Fig. 2 when the aerosol-generating substrate is contained;

Fig. 5 is a schematic diagram of a cross-sectional profile of the heating chamber in Fig. 4;

Fig. 6 is the ternary phase diagram of BaO-A12O3-SiO2;

7 is a schematic cross-sectional view of a substrate tube of a heating assembly in a second embodiment of the present invention;

Fig. 8 is a schematic perspective view of the three-dimensional structure of the heating assembly in the third embodiment of the present invention;

Fig. 9 is a cross-sectional schematic diagram during the molding process of the heating assembly shown in Fig. 8;

Fig. 10 is a schematic perspective view of the three-dimensional structure of the heating assembly in the fourth embodiment of the present invention;

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

Fig. 12 is a schematic cross-sectional view of the substrate tube in Fig. 10;

Fig. 13 is a schematic perspective view of the three-dimensional structure of the heating assembly in the fifth embodiment of the present invention;

Fig. 14 is a schematic cross-sectional view of the substrate tube in Fig. 13;

Fig. 15 is a schematic diagram of a three-dimensional structure of an aerosol generating device inserted with an aerosol generating substrate in some embodiments of the present invention;

Fig. 16 is a schematic longitudinal sectional view of the aerosol generating device shown in Fig. 15 when an aerosol generating substrate is inserted.

Embodiments of the present invention

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners 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. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" The orientation or positional relationship indicated by , "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship that is usually placed when the product of the present invention is used, and is only for the convenience of describing the present invention. The invention and the simplified description do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the present invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element. 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. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions are for the purpose of illustration only and are not intended to represent the only embodiment.

1-5 show the heating assembly 1 in the first embodiment of the present invention, the heating assembly 1 includes a heating tube 10, and a heating cavity 110 for accommodating and heating an aerosol generating substrate 200 is formed in the heating tube 10 . The heating tube 10 may include a base tube 11 , a dielectric layer 12 covering the surface of the base tube 11 , and a heating circuit 13 disposed on the dielectric layer 12 .

The base pipe 11 is in a hollow tubular shape, and the inner wall of the base pipe 11 defines a heating cavity 110 . Both the outer profile and the inner profile of the cross-section of the base pipe 11 can be non-circular, such as polygonal, and the polygonal shape includes but not limited to triangle, square, trapezoid, pentagon and so on. Preferably, the base tube 11 is approximately a Lello polygonal tube, that is, the cross-sectional outer profile and inner profile of the base tube 11 are approximately a Lello polygon, for example, a Lello triangle, a Lello pentagon, or a Lello seven. polygon etc. The Lello polygon is a curve of equal width and has an odd number of curved sides. The odd number of curved inner walls of the base tube 11 can squeeze the aerosol-generating substrate 200 accommodated in the base tube 11 and can have a closer relationship with the aerosol-generating substrate 200. Large contact area. In addition, since the Lello polygon has the same width in any direction, the substrate tube 11 can keep the width constant during one plane rotation.

The cross-sectional inner contour line of the substrate tube 11 , that is, the cross-sectional contour line of the heating cavity 110 has a maximum inscribed circle C1 . The diameter 2R of the largest inscribed circle C1 is smaller than the outer diameter of the aerosol-generating substrate 200 before being squeezed. In some embodiments, the diameter 2R of the largest inscribed circle may be 0.2-2.0 mm smaller than the outer diameter of the aerosol-generating substrate 200 before being squeezed. The diameter 2R of the largest inscribed circle C1 may be 3-9 mm, preferably 4-7 mm. When the aerosol-generating substrate 200 is inserted into the heating chamber 110 , at least part of the cavity wall of the heating chamber 110 can press the aerosol-generating substrate 200 , prompting the aerosol-generating substrate 200 to deform radially inward. FIG. 4 is a cross-sectional view of the roughly cylindrical aerosol-generating substrate 200 housed in the base tube 11 , where the dotted line represents the outline of the cross-section of the aerosol-generating substrate 200 before being squeezed. After the aerosol generating matrix 200 is squeezed and deformed, the distance from its radial surface to the center is reduced, thereby shortening the heat conduction distance. At the same time, the air inside the aerosol generating substrate 200 is squeezed out, and the density of the atomized substrate in the aerosol generating substrate 200 increases, thereby improving the heat conduction efficiency and improving the large temperature difference and low heat transfer efficiency of the aerosol generating substrate 200. , The problem of long warm-up time. It can be understood that the more edges there are in the cross-sectional profile of the heating cavity 110 , the closer the cross-sectional profile of the heating cavity 110 is to a circle. In order to effectively squeeze the aerosol-generating substrate 200 to a certain extent, the number of edges of the cross-sectional profile of the heating chamber 110 should not be too many. Preferably, the base tube 11 is a triangular Lello tube or a five-edge Lello tube. In this embodiment, the base tube 11 is a Lyro triangular tube.

The maximum distance L between the center of the largest inscribed circle C1 and the cross-sectional outline of the heating chamber 110 is greater than the radius R of the largest inscribed circle C1 . When the aerosol-generating substrate 200 is housed in the heating chamber 110, at least one airflow channel 111 for gas circulation may be formed between the outer wall surface of the aerosol-generating substrate 200 and the wall of the heating chamber 110. The channel 111 can extend along the axial direction of the heating chamber 110, so as to ensure smooth air flow during suction. In some embodiments, the maximum distance L from the center of the maximum inscribed circle C1 to the cross-sectional outline of the heating cavity 110 may be greater than 2mm, preferably 3-5mm. In this embodiment, there are three airflow channels 111 , and the three airflow channels 111 are respectively located at the joints of every two arc-shaped sides of the heating cavity 110 .

The dielectric layer 12 can be formed by wrapping the film tape 120 on the outer surface of the base tube 11 and then sintering, wherein the film tape 120 can be a cast film tape formed by tape casting. Specifically, during the process of manufacturing the heating element 1 , the base pipe 11 can be rotated under the action of a force, and the rolled film tape 120 for forming the medium layer 12 can be adhered. Since the outer contour of the cross section of the base tube 11 is an equal-width curve, the base tube 11 is always kept tangent to the rolled film tape 120 during the rotation process, which is conducive to the removal of air bubbles in the roll film process, can effectively avoid roll film bubbles, and improve It can also avoid defects such as tearing of the film due to unstable pressure during the film rolling process. In addition, rounded corners 112 can also be provided at the joints of every two arc-shaped sides of the cross-sectional profile of the base pipe 11. Through proper chamfering, the smoothness of the joints can be improved while maintaining the feature of equal width. Thereby further improving process stability and yield.

The heating circuit 13 can be formed by printing the conductive paste 130 on the film tape 120 and then sintering. The film tape 120 printed with the conductive paste 130 is coated on the outer surface of the base tube 11 , and the dielectric layer 12 formed after sintering is pasted on the outer surface of the base tube 11 . The design of the heating circuit 13 is flexible. The heating circuit 13 can be located on the outer surface of the dielectric layer 12, or between the inner surface of the dielectric layer 12 and the outer surface of the base tube 11. In addition, the heating circuit 13 can also be placed on the surface of the base tube 11. full or partial coverage.

In this embodiment, the heating component 1 is heated by pure resistance conduction heating. The heating circuit 13 is located outside the base tube 11. After the heating circuit 13 is energized and generates heat, it transfers heat from the outer surface of the base tube 11 to the aerosol-generating substrate 200 housed in the base tube 11 to heat the aerosol-generating substrate 200. . The base pipe 11 can be made of metal or non-metal material with high thermal conductivity, which is beneficial to the rapid transfer of heat, and the temperature field uniformity of the base pipe 11 is better under rapid temperature rise. Wherein, the metal material with high thermal conductivity may be stainless steel, aluminum or aluminum alloy, copper or copper alloy, etc., for example, 430 stainless steel. The non-metallic material with high thermal conductivity can be ceramics, such as aluminum oxide, silicon carbide, aluminum nitride, silicon nitride and the like.

The dielectric layer 12 has good insulation and can meet the requirements of thick film printing and sintering to form an effective circuit connection. The dielectric material selected for the dielectric layer 12 needs to have a good co-firing matching with the conductive paste printed on the surface, and have good thermal matching and thermal shock resistance. In addition, the dielectric material can be sintered and bonded to the base material surface of the base tube 11 at low temperature, and the thermal expansion coefficient of the dielectric material matches the thermal expansion coefficient of the base material of the base tube 11 . In this embodiment, the base tube 11 is made of 430 stainless steel substrate, and the dielectric layer 12 is made of dielectric glass.

Further, the dielectric layer 12 also has a certain ability to resist mechanical shock and thermal shock, which can be obtained by adding oxides to the base glass, such as oxides of Fe, Co, Ni, etc., for example, adding oxides to the base glass Add Co2O3. Adding oxides such as Fe, Co, and Ni to the matrix glass can improve the wettability between the dielectric layer 12 and the stainless steel substrate. During the firing process, these elements can form chemical bonds with the stainless steel substrate to increase the bonding strength.

Based on the thermal expansion matching requirements of the dielectric layer 12 and the stainless steel substrate, you can choose to add the BaO-Al2O3-SiO2 system to the base glass, or use CaO to replace part of the BaO system, and the thermal expansion coefficient of the dielectric layer 12 can be adjusted. As shown in Figure 6, according to the ternary phase diagram of BaO-A12O3-SiO2, the main component ratio can be selected near the barium feldspar region, and the approximate ratio between barium-aluminum-silicon oxide in dielectric glass can be: 30-60% BaO, 10-30% A12O3, 15-50% SiO2. The dielectric glass may also include crystal nucleating agents, such as one or more of TiO2, ZrO2, CaF2 and the like. In addition, the dielectric glass can also include alkali metal oxides and alkaline earth metal oxides, such as Na2O, K2O, CaO, MgO, BaO, Al2O3, ZnO, etc., as glass performance adjustment functions. The melting temperature of the glass and the B2O3 to adjust the softening temperature of the glass. In some embodiments, the approximate composition ratio of the dielectric glass is: 75-90% matrix glass, 5-10% B2O3, 1-3% crystal nucleating agent, 0.5-2% Fe, Co, Ni Oxides, 3-10% other alkali metal oxides and alkaline earth metal oxides. The low-temperature treatment temperature of the dielectric layer 12 can be 800-900°C. The dielectric layer 12 can be combined with the stainless steel substrate and can withstand the 350°C room temperature water quenching test, and can withstand the long-term cycle of rising to 350°C for 2 minutes and then cooling for 1 minute. Tested 8000 times.

FIG. 7 shows a schematic cross-sectional view of the base tube 11 in the second embodiment of the present invention. The main difference between it and the first embodiment is that the cross-sectional profile of the base tube 11 in this embodiment is a Relot triangle, and each There is a direct connection between the two arc-shaped sides, that is, no chamfering is performed at the junction of the two arc-shaped sides, so that a sharp corner is formed at the junction of the two arc-shaped sides.

Figures 8-9 show the heating assembly 1 in the third embodiment of the present invention. The main difference between it and the first embodiment is that the heating assembly 1 in this embodiment is a Lello pentacle tube, and the transverse direction of the substrate tube 11 is The outer and inner contours of the section are all Lello pentagons. In addition, the intersection of every two arc-shaped sides of the cross-sectional profile of the base tube 11 can be properly rounded to improve the smoothness of the intersection.

10-12 show the heating assembly 1 in the fourth embodiment of the present invention. The main difference between it and the first embodiment is that the heating assembly 1 in this embodiment also includes an upper part of the heating tube 10 for introducing air. The guide part 20 of the aerosol-generating substrate 200 and the supporting wall 30 covering the bottom of the heating tube 10 are used for axially supporting and positioning the aerosol-generating substrate 200 . The guide part 20, the heating tube 10, and the supporting wall 30 can be integrally formed, or can be formed separately and then assembled together.

In addition, in this embodiment, the base tube 11 is a regular triangular tube, that is, the inner and outer profiles of the cross-section of the base tube 11 are both regular triangular prisms, which have three straight edges. Rounded corners 112 may also be provided at the junction of every two edges of the cross-sectional profile of the base tube 11 to improve the smoothness of the junction. It can be understood that, in other embodiments, the cross-sectional inner and outer contours of the base tube 11 can also be regular quadrilaterals, regular pentagons, regular hexagons and other regular polygons. In order to effectively squeeze the aerosol-generating substrate 200 to a certain extent, the number of edges of the cross-sectional profile of the substrate tube 11 should not be too many, and in some embodiments, the number of edges may be 3-7.

In addition, the heating assembly 1 in this embodiment can adopt the combined heating method of resistance conduction and infrared radiation, and the heating tube 10 includes an infrared radiation layer 14 in addition to the above-mentioned base tube 11 , dielectric layer 12 and heating circuit 13 . The infrared radiation layer 14 can be disposed on the inner surface of the base tube 11, and at this time, the base tube 11 can be made of metal or non-metal material with high thermal conductivity. Wherein, the metal material with high thermal conductivity may be stainless steel, aluminum or aluminum alloy, copper or copper alloy, etc., for example, 430 stainless steel. The non-metallic material with high thermal conductivity can be ceramics, such as aluminum oxide, silicon carbide, aluminum nitride, silicon nitride and the like. In other embodiments, the infrared radiation layer 14 can also be disposed on the outer surface of the base tube 11 , and in this case, the base tube 11 can be made of materials such as quartz with high infrared transmittance.

The supporting wall 30 covers the opening of the lower end of the heating tube 10 and can 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 boss 31 and the heating tube 10 and/or the supporting wall 30 can be integrally formed, or they can be formed separately and then assembled together by welding or the like. In this embodiment, there is one limiting boss 31 , and the one limiting boss 31 can be formed by bending upwards of the supporting wall 30 integrally and can coincide with the central axis of the supporting wall 30 . The top surface of the limiting boss 31 is a plane, and the lower end surface of the aerosol-generating substrate 200 can abut against the at least one limiting boss 31 to achieve supporting positioning. 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 arranged along the periphery of the supporting wall 30. Set to evenly spaced.

The guide part 20 is in the shape of a hollow tube, and the inner wall of the guide part 20 defines an introduction cavity 210 for introducing the aerosol generating matrix 200 . The introduction chamber 210 has a first end 211 away from the heating tube 10 and a second end 212 close to the heating tube 10 . The cross-sectional area of the introduction cavity 210 at the first end 211 is larger than the cross-sectional area at the second end 212, and the cross-sectional area of the introduction cavity 210 at the first end 211 is not smaller than that of the aerosol-generating substrate 200 before being squeezed. cross-sectional area. In this embodiment, the cross-sectional shape of the introduction cavity 210 at the first end 211 corresponds to the cross-sectional shape of the aerosol generating matrix 200, that is, the cross-sectional shape of the introduction cavity 210 at the first end 211 is circular. , and the cross-sectional area of the introduction cavity 210 at the first end 211 is larger than the cross-sectional area of the aerosol-generating substrate 200 before being squeezed, which facilitates the smooth introduction of the aerosol-generating substrate 200 into the heating element 1 .

The cross-sectional shape of the introduction cavity 210 at the second end 212 matches the cross-sectional shape of the heating cavity 110 , and is different from the cross-sectional shape of the first end 211 . In this embodiment, the cross-sectional shape of the introduction cavity 210 at the second end 212 is roughly a regular triangular prism connected by a circular arc transition. The second end 212 of the leading cavity 210 is connected with the upper end of the heating cavity 110 , and the cross-sectional size of the second end 212 of the leading cavity 210 is consistent with the cross-sectional size of the heating cavity 110 . The introduction cavity 210 can adopt a gradual transition from the first end 211 to the second end 212, that is, the cross section of the introduction cavity 210 gradually changes from a circle at the first end 211 to a regular triangular prism consistent with the cross section of the heating tube 10. cavity 110. The aerosol-generating substrate 200 is smoothly inserted into the heating tube 10 through the guiding function of the guiding member 20 , and at the same time is 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 accommodated in the heating tube 10, three airflow passages 111 may be formed between the outer wall of the aerosol-generating substrate 200 and the wall of the heating chamber 110, and the three airflow passages 111 are respectively located in the heating chamber. 110 every two edge joints.

13-14 show the heating assembly 1 in the fifth embodiment of the present invention. The main difference between it and the fourth embodiment is that the cross-sectional outer contour and inner contour of the base pipe 11 in this embodiment are both racetrack circles. Shape, the diameter 2R of the largest inscribed circle C1 of the cross-sectional outline of the heating chamber 110 is consistent with the minor axis length of the circular cross-section inner contour of the runway, and the center of the largest inscribed circle C1 reaches the cross-sectional outline of the heating chamber 110 The maximum distance L corresponds to the radius of the major axis of the inner profile of the circular cross-section of the runway. When the aerosol-generating substrate 200 is accommodated in the heating chamber 110, two airflow passages 111 may be formed between the outer wall of the aerosol-generating substrate 200 and the wall of the heating chamber 110, and the two airflow passages 111 are located in the heating chamber respectively. 110 on either side of the major axis. It can be understood that, in other embodiments, the cross section of the heating cavity 110 may also be other non-circular, for example, axisymmetric non-circular.

Correspondingly, the cross-sectional shape of the second end 212 of the introduction chamber 210 communicating with the heating chamber 110 is a racetrack circle consistent with the cross-sectional shape of the heating chamber 110 . The cross-sectional shape of the first end 211 of the introduction cavity 210 may be circular, and the cross-sectional shape of the introduction cavity 210 gradually changes from a circle at the first end 211 to a racetrack circle at the second end 212 .

In addition, in this embodiment, several through holes 113 communicating with the heating chamber 110 and the introduction chamber 210 may also be opened on the heating assembly 1 . The through hole 113 can be opened at any position of the heating assembly 1 as required. For example, the through hole 113 can be opened on the side wall of the guide component 20 and/or the heating tube 10 , and/or, the through hole 113 can also be opened on the support wall 30 and/or the limiting boss 31 . The shape, size and quantity of the through holes 113 are not limited.

15-16 show an aerosol generating device 100 in some embodiments of the present invention. The aerosol generating device 100 may be roughly rectangular and columnar and may include a housing 2, a heating assembly 1 and a main board disposed in the housing 2. 3 and battery 4. Wherein, the heating assembly 1 can adopt the heating assembly structure in any of the above-mentioned embodiments. It can be understood that, in other embodiments, the aerosol generating device 100 is not limited to be in the shape of a rectangular column, and it can also be in other shapes such as a square column, a cylinder, an ellipse column, and the like.

The top of the housing 2 is provided with a socket 20 for inserting the aerosol generating substrate 200. The cross-sectional shape and size of the socket 20 are compatible with the cross-sectional shape and size of the aerosol generating substrate 200. The aerosol generating substrate 200 can be inserted through the socket. 20 is inserted into the heating component 1 and contacts the inner wall of the heating component 1 . After the heating component 1 is energized and generates heat, it can transfer heat to the aerosol generating substrate 200 , so as to realize the baking and heating of the aerosol generating substrate 200 . The main board 3 is electrically connected to the battery 4 and the heating assembly 1 respectively. A related control circuit is arranged on the main board 3 , and the on-off connection between the battery 4 and the heating assembly 1 can be controlled by the switch 5 provided on the casing 2 . A dustproof cover 6 for covering or exposing the socket 20 may also be provided on the top of the housing 2 . When the aerosol generating device 100 is not needed, the dust-proof cover 6 can be pushed to cover the socket 20 to prevent dust from entering the socket 20 . When needed, push the dust-proof cover 6 to expose the socket 20 so that the aerosol-generating substrate 200 can be inserted through the socket 20 .

The aerosol-generating substrate 200 may include an outer covering 210 and an atomizing substrate 220 disposed on the inner bottom of the outer covering 210 . Wherein, the outer wrapping layer 210 may be outer wrapping paper. The atomized substrate 220 can be a material used for medical treatment or health preservation, for example, plant-like materials such as plant roots, stems, leaves, etc. in solid sheet or filament form. The aerosol generating device 100 bakes and heats the aerosol generating substrate 200 inserted therein at a low temperature, so as to release the aerosol extract in the atomized substrate 220 without burning. Further, the aerosol generating substrate 200 may also include a hollow supporting section 230 , a cooling section 240 and a filtering section 250 arranged in the outer cladding 210 and sequentially arranged above the atomizing substrate 220 in the longitudinal direction. The cross-sectional shape of the aerosol-generating substrate 200 is not limited to being circular, and it can also be in other shapes such as ellipse, square, and polygon.

Above embodiment has only expressed the specific implementation manner of the present invention, and its description is comparatively specific and detailed, but can not therefore be interpreted as the limitation of patent scope of the present invention; It should be pointed out that, for those of ordinary skill in the art, in Under the premise of not departing from the concept of the present invention, the above-mentioned technical features can be freely combined, and some deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations made with the scope of the claims of the present invention All modifications and modifications shall fall within the scope of the claims of the present invention.

Claims

A heating assembly, characterized in that it includes a heating tube (10); the heating tube (10) includes a base tube (11), a medium layer (12) coated on the outer surface of the base tube (11), and a device In the heating circuit (13) of the medium layer (12), a heating cavity (110) for accommodating the aerosol generating substrate (200) is formed in the base tube (11), and the transverse direction of the base tube (11) Both the outer and inner contours of the section are non-circular.
The heating assembly according to claim 1, characterized in that, the base pipe (11) is made of stainless steel base material, and the medium layer (12) is made of dielectric glass.
The heating assembly according to claim 1, characterized in that, the coefficient of thermal expansion of the medium layer (12) matches the coefficient of thermal expansion of the base pipe (11).
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), and the base tube (11) adopts Made of high thermal conductivity metal or ceramics.
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), and the base tube (11) adopts Made of quartz glass.
The heating assembly according to claim 1, characterized in that, the cross-sectional outer contour and inner contour of the base pipe (11) are Rello polygonal.
The heating assembly according to claim 6, wherein the Lello polygons include Lello triangles, Lello pentagons or Lello heptagons.
The heating assembly according to claim 6, characterized in that, rounded corners (112) are formed at the joints of every two arc sides of the Lello polygon.
The heating assembly according to any one of claims 1-8, characterized in that, the heating assembly further comprises a guide part (20) connected to the heating pipe (10), and the guide part (20) is formed inside There is an introduction chamber (210) communicating with the heating chamber (110) for introducing the aerosol generating matrix (200).
The heating assembly according to claim 9, characterized in that, the introduction cavity (210) has a first end (211) away from the heating cavity (110) and a second end close to the heating cavity (110) (212), the cross-sectional area of the introduction cavity (210) at the first end (211) is larger than the cross-sectional area at the second end (212).
The heating assembly according to claim 10, characterized in that, the introduction cavity (210) has a gradual transition from the first end (211) to the second end (212).
An aerosol generating device, characterized by comprising the heating assembly according to any one of claims 1-11.
A method for preparing a heating element, comprising:

providing a base tube (11), the base tube (11) has a non-circular cross-sectional outer profile and inner profile;

Prepare film tape (120);

forming a heating circuit pattern on the film tape (120);

Wrapping the film tape (120) formed with the heating circuit pattern on the outer surface of the base tube (11) to obtain a semi-finished heating tube;

Sintering the semi-finished heating tube to obtain a heating tube (10);

Wherein, the film strip (120) forms a dielectric layer (12) after sintering, and the heating circuit pattern forms a heating circuit (13) after sintering.
The preparation method according to claim 13, characterized in that the step of preparing the film tape (120) comprises:

The film tape (120) is produced by tape casting.
The preparation method according to claim 13, characterized in that, the step of forming the heating circuit pattern on the film tape (120) comprises:

Printing conductive paste (130) on the film tape (120) to form the heating circuit pattern.