CN217958771U - Aerosol generating device and heating assembly thereof - Google Patents

Abstract

The utility model relates to an aerosol generation device and heating element thereof, be formed with the heating chamber that is used for holding aerosol generation substrate in the heating element, the cross section profile in heating chamber includes the orientation at least one spill profile of the axis in heating chamber, at least one spill profile is configured to be used for the extrusion aerosol generation substrate. When the aerosol generating substrate is inserted into the heating assembly, the aerosol generating substrate can be extruded by the cavity wall surface where the concave profile is located, air inside the aerosol generating substrate is extruded and discharged, the heat conduction efficiency is improved, and meanwhile, the heat conduction distance from the outer surface of the aerosol generating substrate to the center of the aerosol generating substrate is reduced, so that the problems of large surface-core temperature difference, low heat conduction efficiency and long preheating time of the aerosol generating substrate are solved.

Description

Aerosol generating device and heating assembly thereof

Technical Field

The utility model relates to an atomizing field, more specifically say, relate to an aerosol produces device and heating element thereof.

Background

A heat non-combustion type atomizing device is an aerosol-generating device that generates an aerosol by heating an aerosol-generating substrate in a non-combustion manner by low-temperature heating. At present, the atomizing device of the non-combustion type usually adopts tubular peripheral heating or central embedded heating. Wherein tubular peripheral heating means that the heating element surrounds the aerosol-generating substrate. In the existing aerosol generating device adopting a tubular peripheral heating mode, a heating component of the aerosol generating device is generally designed to be in a hollow round tubular shape, after an aerosol generating substrate is inserted, a circle on which a cross-sectional contour line of the aerosol generating substrate is located is contacted and coincided with or tangent to the inner wall of the heating component, and the aerosol generating substrate is heated by the heating component to generate aerosol. This structure has at least the following disadvantages: the heat transfer path through which heat is transferred from the heating element to the centre of the aerosol-generating substrate is long, the thermal efficiency is low, resulting in a large temperature difference at the centre of the aerosol-generating substrate, and in addition, the air content within the aerosol-generating substrate is high, which also results in low heat transfer efficiency, long warm-up time, and slow smoking rate.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the present invention is to provide an improved heating assembly and an aerosol generating device having the same, which are directed to the above-mentioned defects of the prior art.

The utility model provides a technical scheme that its technical problem adopted is: constructing a heating assembly having a heating chamber formed therein for containing an aerosol-generating substrate, the heating chamber having a cross-sectional profile comprising at least one concave profile towards a central axis of the heating chamber, the at least one concave profile being configured for compressing the aerosol-generating substrate.

In some embodiments, the cross-sectional profile of the heating chamber further comprises at least one connecting profile connected to the at least one concave profile, the furthest distance between the at least one connecting profile and the central axis of the heating chamber being greater than the radius of the aerosol generating substrate.

In some embodiments, the at least one concave profile and the at least one connecting profile are both smoothly curved and the at least one concave profile is smoothly connected with the at least one connecting profile.

In some embodiments, the at least one concave profile comprises a plurality of concave profiles evenly spaced along a circumference of the heating chamber; the at least one connecting profile comprises a plurality of connecting profiles evenly spaced along the circumference of the heating cavity.

In some embodiments, the at least one concave profile comprises two concave profiles, the two concave profiles being oppositely disposed in a circumferential direction of the heating cavity; the at least one connecting profile comprises two connecting profiles which are oppositely arranged in the circumferential direction of the heating cavity; the two concave profiles and the two connecting profiles are both arc profiles.

In some embodiments, the two concave profiles have a radius of curvature greater than the radius of curvature of the two connecting profiles.

In some embodiments, in a state in which the heating chamber contains the aerosol-generating substrate, at least one air flow passage is defined between the at least one connecting profile and an outer surface of the aerosol-generating substrate.

In some embodiments, the heating assembly includes a heating tube and a heat generating layer disposed on the heating tube; the heating pipe is the tubulose, the internal face of heating pipe defines out the heating chamber.

In some embodiments, the heat generating layer includes a heat generating portion disposed corresponding to the at least one concave profile and a conductive portion disposed corresponding to the at least one connection profile, and the resistivity of the heat generating portion is greater than the resistivity of the conductive portion.

In some embodiments, the heat generating layer comprises at least two parallel heating tracks, at least two heating tracks being distributed along the axial direction and/or the circumferential direction of the heating tube.

In some embodiments, the heating assembly further comprises an infrared layer disposed on the heating tube.

In some embodiments, the heating assembly further comprises a soaking layer disposed on the heating tube.

In some embodiments, the infrared layer is disposed on the inner side of the heating tube, the soaking layer is disposed on the outer side of the heating tube, and the heat generating layer is disposed on the outer side of the soaking layer;

the heating assembly further comprises a medium layer arranged between the heat equalizing layer and the heating layer.

In some embodiments, an introduction chamber is also formed within the heating assembly, the introduction chamber being in communication with the heating chamber for introducing the aerosol-generating substrate.

In some embodiments, the introduction chamber has a first end remote from the heating chamber and a second end proximate to the heating chamber, and a closest distance between a cross-sectional profile of the first end of the introduction chamber and a central axis of the introduction chamber is greater than or equal to a radius of the aerosol generating substrate.

In some embodiments, the ingression lumen has a cross-sectional area at the first end that is greater than a cross-sectional area at the second end.

In some embodiments, the cross-sectional profile of the ingression lumen transitions gradually from the first end to the second end.

In some embodiments, the heating assembly further comprises a support wall disposed at one end of the heating chamber for supporting the aerosol generating substrate.

In some embodiments, the support wall comprises an end wall and at least one boss projecting from the end wall towards the heating cavity.

The utility model also provides an aerosol generating device, including above-mentioned arbitrary heating element.

Implement the utility model discloses following beneficial effect has at least: when the aerosol generating substrate is inserted into the heating assembly, the aerosol generating substrate can be extruded by the cavity wall surface where the concave profile is located, air inside the aerosol generating substrate is extruded and discharged, the heat conduction efficiency is improved, and meanwhile, the heat conduction distance from the outer surface of the aerosol generating substrate to the center of the aerosol generating substrate is reduced, so that the problems of large surface-core temperature difference, low heat conduction efficiency and long preheating time of the aerosol generating substrate are solved.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

figure 1 is a schematic perspective view of an aerosol-generating device according to some embodiments of the present invention with an aerosol-generating substrate inserted therein;

figure 2 is a schematic longitudinal cross-sectional view of the aerosol-generating device of figure 1 inserted with an aerosol-generating substrate;

FIG. 3 is a schematic perspective view of the heat generating component of FIG. 2;

FIG. 4 is a top view of the heating assembly shown in FIG. 3;

FIG. 5 isbase:Sub>A schematic longitudinal sectional view A-A of the heating assembly of FIG. 3;

figure 6 is a schematic cross-sectional view B-B of the heating element of figure 3 with an aerosol-generating substrate inserted therein;

fig. 7 is a schematic longitudinal sectional view of a heating assembly according to a first alternative of the present invention;

figure 8 is a side view of a heating assembly in a second alternative of the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, the embodiments of the present invention will 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. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it should 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", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings or the position or positional relationship which the product of the present invention is usually placed when in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

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," and "fixed" are to be construed broadly and may, 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 meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean 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. 1-2 illustrate an aerosol-generating device 100 according to some embodiments of the present invention, wherein the aerosol-generating device 100 is configured to be energized to apply a low-temperature heating bake to the aerosol-generating substrate 70 contained therein, so as to release the active substance from the aerosol-generating substrate 70 in a non-combustible state, thereby forming an aerosol. The aerosol generating device 100 may be generally square cylindrical. It is understood that in other embodiments, the aerosol generating device 100 is not limited to a square cylinder, but may have other shapes such as a cylinder, an elliptic cylinder, and the like.

The aerosol-generating substrate 70 may be cylindrical in shape and comprises a length 71 of atomising substrate. The aerosol matrix segment 71 may comprise one or more of a filamentary, sheet, particulate, powdered, paste-like, or other solid smoking substrate capable of releasing an aerosol extract therefrom upon heating. The aerosol-generating substrate 70 may have a diameter of from 5mm to 9mm, for example 7mm. Further, the aerosol-generating substrate 70 may also comprise a filter section 72, a cooling section 73, a mouthpiece section 74 and an outer wrapper 75. The atomization substrate section 71, the filter section 72, the cooling section 73 and the suction nozzle section 74 are sequentially arranged along the axial direction of the aerosol generation substrate 70, and the outer cladding 75 is wrapped outside the atomization substrate section 71, the filter section 72, the cooling section 73 and the suction nozzle section 74. The filter segment 72 is used for filtering the aerosol, and the gain effect of improving the purity of the aerosol is achieved. The cooling section 73 is used for cooling the aerosol generated by the atomized matrix section 71, and further outputting the aerosol to the suction nozzle section 74, so as to ensure that the aerosol output by the suction nozzle section 74 reaches a proper temperature. It will be appreciated that in other embodiments, the structure of the aerosol-generating substrate 70 is not limited, for example, the aerosol-generating substrate 70 may take other shapes such as an elliptical cylinder; for another example, the filter section 72 and/or the cooling section 73 and/or the mouthpiece section 74 may not be provided in the aerosol-generating substrate 70.

The aerosol generating device 100 may include a heating assembly 10, a housing 20, a battery 30, and a circuit board 40. The heating assembly 10, the battery 30 and the circuit board 40 are all accommodated in the housing 20. The heating assembly 10 is tubular in shape and is adapted to receive and heat the aerosol-generating substrate 70 when energized. The top of the housing 20 is provided with a socket 21 through which socket 21 an aerosol-generating substrate 70 can be inserted into the heating assembly 10, the heating assembly 10 heating the aerosol-generating substrate 70 when energised. The battery 30 is electrically connected to the heating assembly 10 and the circuit board 40, respectively, for supplying power to the heating assembly 10 and the circuit board 40. The circuit board 40 is used for arranging the relevant control circuit.

In some embodiments, the aerosol-generating device 100 may also include a dust cap 50 for covering or uncovering the receptacle 21. When the aerosol generating device 100 is not needed, the dust cap 50 can be pushed to shield the socket 21, so as to prevent dust from entering into the aerosol generating device 100. When required for use, the dust cap 50 is pushed to expose the socket 21 so that the aerosol generating substrate 70 is inserted from the socket 21.

As shown in fig. 3-6, the heating assembly 10 includes a heating tube 12, the heating tube 12 having a hollow tubular shape, an inner wall surface of the heating tube 12 defining a heating chamber 120, the heating chamber 120 being configured to receive and heat the aerosol generating substrate 70. The cross-section of the heating chamber 120 is a non-circular partially concave shape, and the cross-sectional profile of the heating chamber 120 has at least one concave profile 121 that is concave towards a central axis of the heating chamber 120, the at least one concave profile 121 being capable of squeezing the aerosol generating substrate 70 to a greater extent than is possible for heat transfer. The closest distance R between the concave profile 121 and the central axis of the heating chamber 120 satisfies: r < D/2, where D is the diameter of the aerosol-generating substrate 70. In some embodiments, D-2r =0.2mm to 3.5mm, and further, D-2r =0.2mm to 2mm, may ensure that the aerosol-generating substrate 70 has the appropriate amount of compression.

The cross-sectional profile of the heating cavity 120 further comprises at least one connecting profile 122 connected to the at least one concave profile 121. The at least one connecting profile 122 and the at least one concave profile 121 enclose a cross-sectional profile forming a closed or non-closed heating chamber 120. The closest distance between the connecting profile 122 and the central axis of the heating chamber 120 is equal to or greater than the radius of the aerosol generating substrate 70 and the furthest distance L between the connecting profile 122 and the central axis of the heating chamber 120 is greater than the radius D/2 of the aerosol generating substrate 70, for example 2L-D =0.2 mm-3 mm. When the aerosol-generating substrate 70 is received in the heating chamber 120, at least one airflow channel 1220 may be formed between the outer surface of the aerosol-generating substrate 70 and the wall surface of the heating chamber 120 to provide for smooth airflow during smoking. The at least one air flow channel 1220 is arranged in correspondence with the at least one connection profile 122 in the circumferential direction of the heating chamber 120, the at least one air flow channel 1220 may extend in the axial direction of the heating chamber 120.

In some embodiments, the cross-sectional profile of the heating cavity 120 is axisymmetric and has a plurality of concave profiles 121 and a plurality of connecting profiles 122, one connecting profile 122 being connected between each two adjacent concave profiles 121, and one concave profile 121 being connected between each two adjacent connecting profiles 122. The plurality of concave profiles 121 may be evenly spaced around the circumference of the heating chamber 120 to facilitate even squeezing of the aerosol-generating substrate 70 in the circumferential direction.

Specifically, in the present embodiment, the cross-sectional profile of the heating cavity 120 is substantially in the shape of a butterfly, which includes two concave profiles 121 and two connecting profiles 122. The two concave profiles 121 are oppositely disposed, the two connecting profiles 122 are oppositely disposed, and both ends of one connecting profile 122 are respectively connected with one ends of the two concave profiles 121. Two air flow channels 1220 are formed between the two connecting profiles 122 and the outer surface of the aerosol-generating substrate 70. Further, the concave profile 121 is in the shape of a circular arc that is concave towards the heating chamber 120, the connecting profile 122 is in the shape of a circular arc that is convex towards the outside of the heating chamber 120, and the radius of curvature of the concave profile 121 is larger than the radius of curvature of the connecting profile 122, so that the contact area and the heat transfer area between the heating tube 12 and the aerosol-generating substrate 70 can be larger. Further, the concave profile 121 and the connecting profile 122 may be smoothly connected by rounding or the like. The closest distance R between the concave profile 121 and the central axis of the heating chamber 120 may be greater than 2.5mm. It is understood that in other embodiments, the cross-sectional profile of the heating cavity 120 is not limited to be butterfly-shaped, for example, the number of the concave profiles 121 and the connecting profiles 122 may be three or more.

The aerosol generating substrate 70, when inserted into the heating chamber 120, can be pressed by the walls of the heating chamber 120 into a butterfly shape similar to the cross-sectional shape of the heating chamber 120. Figure 6 shows a cross-sectional view of an aerosol-generating substrate 70 having a cylindrical shape when received in the heating chamber 120, wherein the dotted lines indicate the outer contour of the cross-section of the aerosol-generating substrate 70 before it is extruded. The concave profile 121 is capable of squeezing the aerosol-generating substrate 70 to a limited extent and expelling air from within the aerosol-generating substrate segment 71, thereby increasing the heat transfer efficiency of the aerosol-generating substrate segment 71, and furthermore, the heat transfer distance from the outer surface of the aerosol-generating substrate 70 to the center thereof is reduced, thereby improving the problems of large surface-to-core temperature difference, low heat transfer efficiency, long preheating time, and the like of the aerosol-generating substrate 70. The heating element 10 of this embodiment, the smoking fog volume of two preceding mouths and whole fog volume all have apparent increase, and the aerosol releases the active substance more completely, and user experience is good.

In the present embodiment, the shape of the cross-sectional outer contour of the heating tube 12 corresponds to the shape of the cross-sectional contour of the heating chamber 120, and the heating tube 12 has a uniform wall thickness in both its axial and circumferential directions. In other embodiments, the shape of the cross-sectional outer contour of the heating tube 12 may also differ from the shape of the cross-sectional outer contour of the heating chamber 120, and the heating tube 12 may also have a non-uniform wall thickness in its axial and/or circumferential direction.

Further, the heating assembly 10 further includes a guide tube 11 and a support wall 13, and the guide tube 11 and the support wall 13 are respectively disposed at two axial opposite ends of the heating tube 12. A support wall 13 is closed to the lower end of the heating tube 12 and is capable of supporting the aerosol-generating substrate 70 to provide support and retention of the aerosol-generating substrate 70 within the heating chamber 120. The support wall 13 may be formed integrally with the heating tube 12, or may be formed separately from the heating tube 12 and then assembled together.

In some embodiments, the support wall 13 includes a flat end wall 131 and at least one boss 132 protruding from the end wall 131 into the heating chamber 120. When the aerosol-generating substrate 70 is received in the heating chamber 120, the underside of the aerosol-generating substrate 70 may abut against the at least one boss 132, forming an airflow gap between the underside of the aerosol-generating substrate 70 and the end wall 131 for airflow. In this embodiment, there is one boss 132, and the one boss 132 is located at the center of the end wall 131. In other embodiments, there may be more than one boss 132.

The guide tube 11 is disposed at the upper end of the heating tube 12, and may be integrally formed with the heating tube 12, or may be separately formed from the heating tube 12 and then assembled together. The guide tube 11 is tubular with an inner wall defining an inlet chamber 110 for introducing the aerosol-generating substrate 70. The introduction chamber 110 has a first end 111 distal from the heating chamber 120 and a second end 112 proximal to the heating chamber 120. The cross-sectional area of the introduction chamber 110 at the first end 111 is greater than or equal to the cross-sectional area of the aerosol-generating substrate 70 prior to extrusion, or alternatively, the closest distance between the cross-sectional profile of the introduction chamber 110 at the first end 111 and the central axis of the introduction chamber 110 is greater than or equal to the radius of the aerosol-generating substrate 70, facilitating introduction of the aerosol-generating substrate 70.

The cross-sectional shape of the ingression lumen 110 at the first end 111 may have a different shape than both the cross-sectional shape of the aerosol generating substrate 70 and the cross-sectional shape of the heating lumen 120. In this embodiment, the cross-sectional shape of the introduction chamber 110 at the first end 111 is substantially racetrack shaped, and the major axis direction and the minor axis direction thereof coincide with the major axis direction and the minor axis direction of the heating chamber 120, respectively. In other embodiments, the cross-sectional shape of the introduction chamber 110 at the first end 111 may also correspond to the cross-sectional shape of the aerosol-generating substrate 70 or the cross-sectional shape of the heating chamber 120, for example, the cross-sectional shape of the introduction chamber 110 at the first end 111 may be circular or butterfly.

The transverse cross-sectional area of the introduction chamber 110 at the second end 112 is smaller than the transverse cross-sectional area at the first end 111, and the transverse cross-sectional shape of the introduction chamber 110 at the second end 112 is the same as the transverse cross-sectional shape of the heating chamber 120. In this embodiment, the second end 112 of the introduction chamber 110 is directly connected to the upper end of the heating chamber 120, and the cross-sectional dimension of the introduction chamber 110 at the second end 112 is the same as the cross-sectional dimension of the heating chamber 120. The introduction chamber 110 may employ a smooth transition from the first end 111 to the second end 112 so that the aerosol-generating substrate 70 can be smoothly inserted into the heating tube 12. Specifically, in the present embodiment, the cross-sectional shape of the introduction chamber 110 gradually changes from a racetrack shape at the first end 111 to a butterfly shape at the second end 112, and the introduction chamber is engaged with the heating tube 12 at the second end 112.

In the present embodiment, the shape of the cross-sectional outer profile of the guide tube 11 corresponds to the shape of the cross-sectional profile of the introducing chamber 110, and the guide tube 11 has a uniform wall thickness in both the axial and circumferential directions thereof. In other embodiments, the shape of the cross-sectional outer profile of the guide tube 11 may also be different from the shape of the cross-sectional profile of the ingression lumens 110, and the guide tube 11 may also have a non-uniform wall thickness in its axial and/or circumferential direction.

Further, the outer wall surface of the upper end of the guide tube 11, which is away from the heating tube 12, may also be extended outward to form a flange 113, and the flange 113 may be used for installing and positioning the heating assembly 10 in the housing 20.

In some embodiments, the heating assembly 10 can further include a plurality of through holes communicating with the heating chamber 120 and/or the introduction chamber 110. The plurality of through holes may be opened at any position of the heating assembly 10 as required, for example, they may be opened on the guide tube 11 and/or the heating tube 12 and/or the support wall 13. The shape, size and number of the through holes are not limited.

The heating form of the heating assembly 10 is not limited, and it may be, for example, various heating forms such as resistance conduction heating, infrared radiation heating, electromagnetic induction heating, or composite heating. The heating assembly 10 further includes a heat generating layer 14 disposed on an inner surface and/or an outer surface of the heating tube 12. The heating layer 14 may include a heating film, a heating wire, a heating sheet, or a heating net, which is capable of generating heat when energized.

In the present embodiment, the heat generating layer 14 is a heat generating film and is disposed on the outer surface of the heating tube 12. The heat generating layer 14 generates heat when energized, and transfers the generated heat from the outer surface of the heating tube 12 to the aerosol-generating substrate 70 accommodated in the heating tube 12, thereby heating the aerosol-generating substrate 70. The heating tube 12 can be made of metal or non-metal material with high heat conductivity coefficient, which is beneficial to the rapid heat transfer, and the uniformity of the temperature field of the heating tube 12 is good under the rapid temperature rise. Wherein the higher thermal conductivity metal material may comprise stainless steel, aluminum or an aluminum alloy. The higher thermal conductivity non-metallic material may comprise a ceramic, such as alumina, silicon carbide, aluminum nitride, silicon nitride, and the like. Further, the inner and/or outer surface of the heating tube 12 may also be provided with a soaking layer having a higher thermal conductivity than the heating tube 12, thereby enabling further improved uniformity of heating of the aerosol-generating substrate 70.

In some embodiments, the heat generating layer 14 may include a heat generating portion 141 and a conductive portion 142, and the heat generating portion 141 and the conductive portion 142 are disposed corresponding to the concave profile 121 and the connection profile 122, respectively. The resistivity of the conductive portion 142 is smaller than that of the heat generating portion 141, so that the amount of heat generated by the conductive portion 142 is smaller than that of the heat generating portion 141 at the time of energization, for example, the amount of heat generated by the conductive portion 142 is 1/2 or less of that of the heat generating portion 141. The heat generating portion 141 is mainly used for generating heat, and the conductive portion 142 is mainly used for electrically conducting the heat generating portion 141. Since the concave profile 121 is in close contact with the aerosol-generating substrate 70 and the connection profile 122 is mostly not in contact with the aerosol-generating substrate 70, the energy utilization rate can be greatly improved by designing the heat generation amount of the heat-generating portion 141 to be larger than that of the conductive portion 142.

Fig. 7 shows a heating assembly 10 in a first alternative of the present invention, which is mainly different from the above-mentioned embodiment in that the heating assembly 10 in this embodiment adopts an infrared heating method, and accordingly, the heating assembly 10 further includes an infrared layer 15 disposed on the surface of the heating tube 12. This embodiment does benefit to infrared penetrability heating aerosol and produces substrate 70, forms three-dimensional heating field, can arouse the fragrant smell that aerosol produced substrate 70 better, and the heat utilization efficiency is better, can reduce the energy consumption.

Specifically, in the present embodiment, the infrared layer 15 is provided on the inner surface of the heating tube 12 for generating infrared heat radiation. The heating tube 12 may be made of a metal or non-metal material with a low thermal conductivity to reduce heat conduction and heat loss. It is understood that in other embodiments, the infrared layer 15 can be disposed on the outer surface of the heating tube 12, and in this case, the heating tube 12 can be made of quartz or the like with high infrared transmittance.

Further, the heating assembly 10 may further include a protective layer 16 disposed on the inner surface of the heating tube 12. The protective layer 16 is arranged on the inner side of the infrared layer 15 and may comprise a glass enamel layer or a ceramic coating. The heating tube 12 and the infrared layer 15 are in contact with the aerosol generating substrate 70 through the protective layer 16, the protective layer 16 has high surface smoothness, insertion and extraction of the aerosol generating substrate 70 are facilitated, and the aerosol generating substrate 70 is not easily adhered to the protective layer 16 after heating.

Further, in the present embodiment, the heating assembly 10 further includes a soaking layer 17 disposed on the outer surface of the heating pipe 12 and a medium layer 18 disposed between the soaking layer 17 and the heat generating layer 14. The uniform heating layer 17, the medium layer 18 and the heating layer 14 are sequentially arranged on the outer surface of the heating pipe 12 from inside to outside. The uniform heating layer 17 is made of uniform heating material and is used for homogenizing the temperature field. In some embodiments, the soaking layer 17 may be made of a highly thermally conductive material such as copper or silver. The dielectric layer 18 is used for carrying the heat generating layer 14, and is used for increasing the structural stability of the heat generating layer 14 and preventing the heat generating layer 14 from being separated.

Fig. 8 shows a heating assembly 10 in a second alternative of the present invention, which is different from the above-described embodiment mainly in that the heat generating layer 14 in the present embodiment includes at least two heating traces 140. The at least two heating traces 140 are arranged in parallel, are each connected to the circuit board 40, and are capable of operating individually or simultaneously under the control of the circuit board 40. The at least two heating traces 140 may be distributed along the axial and/or circumferential direction of the heating tube 12, thereby achieving a segmented heating in the axial and/or circumferential direction of the heating tube 12.

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

The above embodiments only express the specific embodiments of the present invention, and the description thereof is 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 modifications and improvements 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 changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (20)

1. A heating assembly, characterized in that a heating chamber (120) for containing an aerosol-generating substrate (70) is formed within the heating assembly (10), the heating chamber (120) having a cross-sectional profile comprising at least one concave profile (121) towards a central axis of the heating chamber (120), the at least one concave profile (121) being configured for squeezing the aerosol-generating substrate (70).

2. A heating assembly according to claim 1, wherein the cross-sectional profile of the heating chamber (120) further comprises at least one connecting profile (122) connected to the at least one concave profile (121), the furthest distance between the at least one connecting profile (122) and the central axis of the heating chamber (120) being greater than the radius of the aerosol generating substrate (70).

3. The heating assembly according to claim 2, characterized in that said at least one concave profile (121), said at least one connecting profile (122) are both smoothly curved and said at least one concave profile (121) is smoothly connected with said at least one connecting profile (122).

4. The heating assembly according to claim 2, wherein the at least one concave profile (121) comprises a plurality of concave profiles (121), the plurality of concave profiles (121) being evenly spaced along a circumference of the heating cavity (120); the at least one connecting profile (122) comprises a plurality of connecting profiles (122), the plurality of connecting profiles (122) being evenly spaced apart along the circumference of the heating cavity (120).

5. The heating assembly according to claim 2, wherein the at least one concave profile (121) comprises two concave profiles (121), the two concave profiles (121) being oppositely arranged in a circumferential direction of the heating cavity (120); the at least one connecting profile (122) comprises two connecting profiles (122), the two connecting profiles (122) are arranged oppositely in the circumferential direction of the heating cavity (120); both the two concave profiles (121) and the two connecting profiles (122) are arc-shaped profiles.

6. The heating assembly according to claim 5, wherein the two concave profiles (121) have a radius of curvature greater than the radius of curvature of the two connecting profiles (122).

7. A heating assembly according to claim 2, wherein in a state in which the heating chamber (120) contains the aerosol generating substrate (70), at least one air flow passage (1220) is defined between the at least one connecting profile (122) and an outer surface of the aerosol generating substrate (70).

8. The heating assembly according to claim 2, characterized in that the heating assembly (10) comprises a heating tube (12) and a heat generating layer (14) arranged on the heating tube (12); the heating pipe (12) is tubular, and the heating cavity (120) is defined by the inner wall surface of the heating pipe (12).

9. The heating assembly according to claim 8, wherein the heat generating layer (14) comprises a heat generating portion (141) arranged in correspondence with the at least one concave profile (121) and a conductive portion (142) arranged in correspondence with the at least one connection profile (122), the resistivity of the heat generating portion (141) being greater than the resistivity of the conductive portion (142).

10. The heating assembly according to claim 8, characterized in that the heat generating layer (14) comprises at least two parallel heating tracks (140), at least two heating tracks (140) being distributed in axial and/or circumferential direction of the heating tube (12).

11. A heating element according to claim 8, characterized in that the heating element (10) further comprises an infrared layer (15) arranged to the heating tube (12).

12. The heating assembly according to claim 11, characterized in that the heating assembly (10) further comprises a soaking layer (17) arranged to the heating tube (12).

13. The heating assembly according to claim 12, wherein the infrared layer (15) is disposed inside the heating tube (12), the soaking layer (17) is disposed outside the heating tube (12), and the heat generating layer (14) is disposed outside the soaking layer (17);

the heating assembly (10) further comprises a medium layer (18) arranged between the heat equalizing layer (17) and the heat generating layer (14).

14. A heating assembly according to any of claims 1 to 13, wherein an introduction chamber (110) is further formed within the heating assembly (10), the introduction chamber (110) being in communication with the heating chamber (120) for introduction of the aerosol generating substrate (70).

15. A heating assembly according to claim 14, wherein the introduction chamber (110) has a first end (111) remote from the heating chamber (120) and a second end (112) proximate to the heating chamber (120), the closest distance between the cross-sectional profile of the first end (111) of the introduction chamber (110) and the central axis of the introduction chamber (110) being greater than or equal to the radius of the aerosol generating substrate (70).

16. The heating assembly according to claim 15, wherein the cross-sectional area of the ingression lumen (110) at the first end (111) is greater than the cross-sectional area at the second end (112).

17. The heating assembly according to claim 16, wherein the cross-sectional profile of the ingression lumen (110) is a gradual transition from the first end (111) to the second end (112).

18. A heating assembly according to any of claims 1 to 13, wherein the heating assembly (10) further comprises a support wall (13) provided at one end of the heating chamber (120) for supporting the aerosol generating substrate (70).

19. The heating assembly according to claim 18, wherein the support wall (13) comprises an end wall (131) and at least one boss (132) protruding from the end wall (131) towards the heating cavity (120).

20. An aerosol generating device comprising a heating assembly (10) according to any of claims 1 to 19.

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