WO2022161052A1 - Aerosol generating device - Google Patents

Abstract

An aerosol generating device (10), comprising a heating base (17) and a heating member (19), wherein the heating base (17) is provided with a heating cavity (173); the heating member (19) is used for accommodating and heating an aerosol generating matrix (11); the heating member (19) is arranged in the heating cavity (173); the heating member (19) comprises a first side wall (191); a first airflow channel (21) is formed between the first side wall (191) and an inner surface of the heating cavity (173); an inner surface of the first side wall (191) is provided with protrusions (193); a second airflow channel (20) is formed between the first side wall (191) and the aerosol generating matrix (11) by the protrusions (193); and the first airflow channel (21) and the second airflow channel (20) both lead to the bottom of the heating cavity (173) from the outside of the aerosol generating device (10). The aerosol generating device (10) can solve the problem of the temperature of the inner periphery and of the outer periphery not being uniform when an aerosol generating matrix is heated.

Description

aerosol generating device

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority based on Chinese patent application 2021202863453 filed on January 29, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of aerosol generation, and in particular, to an aerosol generation device.

Background technique

Traditional products generate aerosols by burning, and a large amount of harmful substances are easily volatilized under the high temperature of over 800°C. In order to meet people's needs and at the same time reduce the harm caused by harmful substances caused by combustion, "heat-not-burn" type aerosol generating devices came into being.

The "heat-not-burn" aerosol-generating device generates aerosol by heating and baking different forms of aerosol-generating substrates (such as grass-like materials), and transmits the aerosol to the user for inhalation. This "heat-not-burn" method allows the aerosol-generating substrate to be heated only at a relatively low temperature (200°C-400°C), without burning and without generating an open flame, effectively avoiding the aerosol-generating substrate caused by Generation of harmful substances.

The current "heat-not-burn" aerosol generating device usually adopts electromagnetic induction heating or resistance material heating. In the electromagnetic induction heating, coils are arranged around the heating element containing the aerosol-generating substrate, and the heating element is heated by electromagnetic induction and conducts the heat to the aerosol-generating substrate, and the aerosol-generating substrate is baked and heated.

The aerosol-generating substrate typically forms a tight fit with the heating element for baking heating. Due to the fast heating efficiency of electromagnetic induction, the heating element can reach a very high temperature in an instant, and the outer periphery of the aerosol-generating matrix in direct contact with the heating element can easily reach a high temperature, but the aerosol-generating matrix has low internal heat transfer efficiency, resulting in internal gas The baking of the sol-generating substrate is insufficient, and the temperature distribution of the inner and outer periphery of the aerosol-generating substrate is not uniform.

SUMMARY OF THE INVENTION

The aerosol generating device provided by the present application can solve the problem of uneven temperature between the inner and outer periphery when the aerosol generating substrate is heated.

In order to solve the above technical problems, a technical solution adopted in the present application is to provide an aerosol generating device. The aerosol generating device includes a heating seat and a heating element. The heating base has a heating cavity; the heating element is used for accommodating and heating the aerosol generating substrate, and the heating element is arranged in the heating cavity; the heating element includes a first side wall, and a first airflow is formed between the first side wall and the inner surface of the heating cavity channel; the inner surface of the first side wall is provided with a protrusion, and the protrusion forms a second airflow channel between the first side wall and the aerosol generating substrate, and the first airflow channel and the second airflow channel are both formed by the outside of the aerosol generating device to the bottom of the heating chamber.

Wherein, the ratio of the area of the surface of the protrusion for contacting with the aerosol-generating substrate to the area of the inner surface of the first side wall is 5%-15%.

Among them, the maximum height of the protrusion is 2mm-5mm.

Wherein, the first side wall is arranged in a ring shape; the protrusions are spirally arranged on the inner surface of the first side wall; or, a plurality of strip-shaped protrusions are arranged on the inner surface of the first side wall at intervals along the circumferential direction; Arc-shaped protrusions are arranged at intervals on the inner surface of the first side wall along the circumferential direction; or, a plurality of point-shaped protrusions are distributed on the inner surface of the first side wall in an array; or, a plurality of annular protrusions Spaced on the inner surface of the first side wall along the axial direction, each annular protrusion has a slot or a through hole.

Wherein, the concave part of the first side wall constitutes the protrusion.

Wherein, the first side wall is annularly arranged, and the heating element and the heating seat are arranged coaxially.

Wherein, the heating seat includes a second side wall, a first limiting member is arranged between the first side wall and the second side wall, and the first limiting member makes the space between the first side wall and the second side wall arranged , so that a first airflow channel is formed between the first side wall and the inner surface of the heating cavity.

Wherein, the protrusion on the outer surface of the first side wall forms the first limiting member; and/or the protrusion on the inner surface of the second side wall forms the first limiting member.

Wherein, the heating seat includes a second side wall and a bottom wall, and the second side wall and bottom wall form a heating cavity; a third airflow channel is formed between the bottom wall and the aerosol generating substrate, and the third airflow channel is connected with the first airflow channel and the The second airflow channel communicates with each other.

Wherein, a first limiting member is provided between the first side wall and the second side wall, and the first limiting member is used for limiting the heating member, so that the third airflow channel is communicated with the first airflow channel.

Wherein, the first side wall is in contact with the bottom wall, and the end of the first side wall close to the bottom wall has an opening, so that the third airflow channel communicates with the first airflow channel.

Wherein, the bottom wall or the second side wall or the first side wall is provided with a second limiting member; the second limiting member separates the aerosol generating substrate and the bottom wall to form a third airflow channel.

The beneficial effects of this application are:

In the aerosol generating device provided by the present application, the aerosol generating device provides a first airflow channel and a second airflow channel on both sides of the heating element, and the convex arrangement in the second airflow channel directs the heating element to the aerosol generating substrate. The heat transfer mode changes from heat conduction to the combined action of heat conduction and heat convection, and heat convection is the dominant heat transfer mode. The heat transfer efficiency of heat convection is lower than that of heat conduction, so it can effectively slow down the heat transfer speed of heat from the heating element to the periphery of the aerosol-generating substrate; at the same time, the cold airflow passes through the first airflow channel and the second airflow channel, so that the first airflow The heating rate of the air in the channel and the second airflow channel is slower, so that the heat transfer rate of the heating element to the outer periphery of the aerosol generating substrate is similar to the heat transfer rate from the outer periphery of the aerosol generating substrate to the interior, thereby effectively making the aerosol generating substrate. The temperature difference between the inner and outer circumferences is reduced, which solves the problem of uneven temperature between the inner and outer circumferences when the aerosol-generating substrate is heated.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic structural diagram of an aerosol generating device provided by the application;

2 is a schematic cross-sectional structure diagram of the aerosol generating device provided by the application;

Fig. 3 is the enlarged structure schematic diagram of A place in Fig. 2;

Fig. 4 is a kind of structural representation of the aerosol generating device and the aerosol generating substrate assembly provided by the application;

Fig. 5 is a kind of sectional structure schematic diagram of the aerosol generating device provided by the application and the aerosol generating substrate assembly;

6 is another schematic cross-sectional structure diagram of the aerosol generating device and the aerosol generating substrate assembly provided by the application;

7 is a schematic diagram of the flow path of the airflow in the aerosol generating device provided by the application;

8 is a schematic structural diagram of a heating element provided by the application;

FIG. 9 is another schematic structural diagram of the heating element provided by the application;

FIG. 10 is another schematic structural diagram of the heating element provided by the application;

11 is another schematic structural diagram of the heating element provided by the application;

FIG. 12 is another schematic structural diagram of the heating element provided by the application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

In the following description, for purposes of illustration and not limitation, specific details such as specific system structures, interfaces, techniques, etc. are set forth in order to provide a thorough understanding of the present application.

The term "and/or" in this article is only an association relationship to describe the associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and A and B exist independently B these three cases. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship. Also, "multiple" herein means two or more than two.

The terms "first", "second" and "third" in this application are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as "first", "second", "third" may expressly or implicitly include at least one of said features. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined. All directional indications (such as up, down, left, right, front, rear...) in the embodiments of the present application are only used to explain the relative positional relationship between components under a certain posture (as shown in the accompanying drawings). , motion situation, etc., if the specific posture changes, the directional indication also changes accordingly. The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes Other steps or components inherent to these processes, methods, products or devices.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are they separate or alternative embodiments that are mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

The present application will be described in detail below with reference to the accompanying drawings and embodiments.

It should be noted in advance that, in general, the outer part of the aerosol-generating substrate has a shell. For example, a paper package is provided on the outside, but in order to simplify the description of the embodiment, the aerosol-generating substrate described below generally refers to an aerosol-generating substrate including a casing.

Please refer to FIGS. 1 to 4 . FIG. 1 is a schematic structural diagram of the aerosol generating device 10 provided by the present application, FIG. 2 is a cross-sectional structural schematic diagram of the aerosol generating device 10 in FIG. 1 , and FIG. 3 is A in FIG. 2 . 4 is an enlarged schematic structural diagram of the aerosol generating device 10 and the aerosol generating substrate 11 in cooperation.

In this embodiment, an aerosol generating device 10 is provided, and the aerosol generating device 10 can be used to heat and bake the aerosol generating substrate 11 and generate aerosol for the user to inhale. The aerosol generating device 10 includes a housing 12 and a heating switch 13 . The heating switch 13 is provided on the outer surface of the housing 12 for controlling the activation and deactivation of the aerosol generating device 10 . The various components of the aerosol generating device 10 are housed in the housing 12 . In this embodiment, the shape of the housing 12 is cylindrical, and in other embodiments, the housing 12 may also have other shapes. The housing 12 may be made of the same material or may be made of multiple materials. For example, the housing 12 includes an outer plastic layer and an inner metal layer, and only the outer plastic layer is accessible to a user during use. The heat generated inside the aerosol generating device 10 is evenly distributed in the metal inner layer through the rapid heat conduction property of the metal, so as to prevent the plastic outer layer from being overheated and scalded by the user, and also prevent the plastic outer layer from softening.

The aerosol generating device 10 further includes an atomizer 14 , a battery assembly 15 and a controller 16 , and the atomizer 14 and the battery assembly 15 are electrically connected. Specifically, the top of the casing 12 has a first opening 121, the interior of the casing 12 has an installation cavity 122, the atomizer 14 and the battery assembly 15 are both arranged in the installation cavity 122, and the atomizer 14 is arranged in the battery assembly 15 close to the first opening 121. one side of the opening 121 . The atomizer 14 is used for heating and baking the aerosol-generating substrate 11 to generate aerosol, and the battery assembly 15 is used for supplying power to the atomizer 14 .

Further, the atomizer 14 includes a heating base 17 , a coil 18 and a heating element 19 . The controller 16 is disposed on the side of the battery assembly 15 close to the first opening 121 , and the controller 16 is electrically connected to the coil 18 , the heating switch 13 and the battery assembly 15 . The controller 16 is used to control the start and stop of the electromagnetic induction heating of the coil 18 and the heating element 19, and can control parameters such as heating power and temperature. When the user needs to use the aerosol generating device 10, the heating switch 13 of the housing 12 can be pressed. When the controller 16 receives the user's request for use, the controller 16 controls the battery assembly 15 to supply power to the coil 18, so that the coil 18 and the heating element 19 are electromagnetically induced The aerosol is heated to generate the substrate; when the user presses the heating switch 13 of the housing 12 again, the controller 16 receives the user's request to stop using, controls the battery assembly 15 to stop supplying power to the coil 18, and the coil 18 stops working. The controller 16 also has other functions, which will not be described in detail here.

The heating seat 17 is used to fix the aerosol-generating substrate 11 . The heating seat 17 is disposed at one end of the installation cavity 122 close to the first opening 121 , and the heating seat 17 has a bottom wall 171 and a second side wall 172 . In this embodiment, the second side wall 172 of the heating seat 17 is annularly arranged and has a cylindrical shape. The second side wall 172 is arranged at one end of the bottom wall 171 close to the first opening 121 . The second side wall 172 is connected to the heating seat 17 . The bottom wall 171 of the heating chamber 173 is surrounded. The thickness of the bottom wall 171 is greater than that of the second side wall 172 , so that the structural strength of the heating seat 17 is higher. Further, the second side wall 172 and the bottom wall 171 are integrally formed, and the materials of the second side wall 172 and the bottom wall 171 may be thermally conductive materials such as metal or alloy.

The top of the second side wall 172 of the heating seat 17 abuts against the top of the housing 12 , and the heating seat 17 is disposed coaxially with the housing 12 . One end of the second side wall 172 close to the first opening 121 has a second opening 174 . The diameter of the second opening 174 is greater than or equal to the diameter of the first opening 121 . Therefore, the heating seat 17 separates the installation cavity 122 from the heating cavity 173 , and the heating The cavity 173 communicates with the outside of the aerosol generating device 10 through the second opening 174 and the first opening 121 . In this embodiment, the diameter of the second opening 174 is the same as that of the first opening 121 and smaller than the inner diameter of the second side wall 172, and the shapes of the second opening 174 and the first opening 121 are both circular. In other embodiments, the heating seat 17 is not limited to the structure described in this embodiment.

The coil 18 is used to heat the aerosol-generating substrate 11 . In this embodiment, the coil 18 is sleeved on the outer periphery of the second side wall 172 of the heating base 17 to heat the aerosol-generating substrate 11 in the heating element 19 . In this embodiment, the coil 18 is a helically wound coil, and the changing magnetic field generated after the coil is energized penetrates the metal heating element 19 to generate eddy currents to make the metal heating element 19 generate heat and heat the aerosol-generating substrate. In other embodiments, other heating methods may also be used to heat the aerosol generating substrate 11, such as resistance wires.

The heating element 19 is arranged in the heating chamber 173 . The heating element 19 includes a first side wall 191 . Further, the first side wall 191 of the heating element 19 is annularly arranged, and one end of the first side wall 191 close to the second opening 174 has a third opening 192 , so that the heating element 19 has a third opening 192 . The inside communicates with the heating chamber 173 and communicates with the outside of the aerosol generating device 10 .

Please refer to FIG. 4 , FIG. 5 and FIG. 6 , the heating element 19 is used to accommodate and heat the aerosol generating substrate 11 , and the aerosol generating substrate 11 can be arranged inside the heating element 19 . When the user uses the aerosol generating device 10, the aerosol generating substrate 11 is inserted into the first opening 121 of the aerosol generating device 10, and is disposed in the second opening 174 of the heating base 17 and the third opening 192 of the heating element 19 in sequence. Inside the heat conductor.

In this embodiment, the shape of the heating element 19 may be a cylindrical shape, of course, it may also be other shapes, such as a quasi-cylindrical shape, a cube, and the like. The heating element 19 is arranged coaxially with the heating base 17 . Thereby, the coil 18 can uniformly heat the outer circumference of the first side wall 191 , which in turn can uniformly heat the outer circumference of the aerosol-generating substrate 11 .

Please refer to FIG. 3 and FIG. 7 . FIG. 7 is a schematic diagram of the flow path of the airflow in the aerosol generating device 10 provided by the present application. Further, the inner surface of the first side wall 191 of the heating element 19 is provided with a protrusion 193 . A part of the surface of the protrusion 193 is in contact with the outer periphery of the aerosol-generating substrate 11 , and heat is transferred to the aerosol-generating substrate 11 by thermal conduction. When the aerosol generating substrate 11 is disposed inside the heating element 19, the protrusions 193 of the first side wall 191 can make a gap between the aerosol generating substrate 11 and the inner surface of the first side wall 191, and form the second airflow channel 20 . The second airflow channel 20 leads from the outside of the aerosol generating device 10 to the bottom of the heating chamber 173 , so that air flows into the second airflow channel 20 from the third opening 192 and flows to the bottom of the heating chamber 173 through the second airflow channel 20 , and finally flows to the end of the aerosol generating substrate 11 facing away from the third opening 192 . When the air flows through the protrusions 193 on the first side wall 191 , the air flows from both sides of the protrusions 193 to the bottom of the aerosol-generating substrate 11 .

There is a gap between the outer surface of the first side wall 172 and the inner surface of the heating cavity 173 , so that the outer surface of the first side wall 172 and the inner surface of the heating cavity 173 form the first airflow channel 21 . The first airflow channel 21 leads from the outside of the aerosol generating device 10 to the bottom of the heating chamber 173 , so that air flows into the second airflow channel 20 from the second opening 174 , and flows to the bottom of the heating chamber 173 through the second airflow channel 20 , and finally flows to the end of the aerosol generating substrate 11 facing away from the third opening 192 .

In this embodiment, the arrangement of the second airflow channel 20 and the protrusions 193 changes the heat transfer mode from the heating element 19 to the aerosol generating substrate 11 from heat conduction to the combined action of heat conduction and heat convection, and heat convection dominates the heat transfer Way. The heat transfer efficiency of heat convection is lower than that of heat conduction, so it can effectively slow down the heat transfer rate of heat from the heating element 19 to the periphery of the aerosol generating substrate 11; The heat transfer rate from the outer circumference of the generating matrix 11 to the interior is similar, thereby effectively reducing the temperature difference between the inner and outer circumferences of the aerosol generating matrix 11, and solving the problem of uneven temperature between the inner and outer circumferences when the aerosol generating matrix 11 is heated.

Disposing the first airflow channel 21 and the second airflow channel 20 on both sides of the heating element 19 can make the heating rate of the air in the first airflow channel 21 and the second airflow channel 20 slower, and the air flow from the outside of the aerosol generating device 10 The first airflow channel 21 and the second airflow channel 20 flow to the bottom of the heating chamber 173, and the heat in the first airflow channel 21 and the second airflow channel 20 is taken away, so that the heat generated by the heating element 19 and the first side wall 191 The amount of heat radiated to the inner surface of the heating seat 17 is reduced. Therefore, the heat transfer speed to the outer periphery of the aerosol generating substrate 11 is slower, the temperature difference between the outer periphery and the interior of the aerosol generating substrate 11 is smaller, and the uniformity of the temperature distribution between the inner and outer periphery of the aerosol generating substrate 11 is better, which solves the problem of aerosol generation. The problem of uneven temperature between the inner and outer periphery when the substrate is heated.

In addition, the cold air flows through the first airflow channel 21 and the second airflow channel 20 to take away part of the heat in the first airflow channel 21 and the second airflow channel 20, so that the heating chamber 173 is transferred to the housing 12 of the aerosol generating device 10 The heat of the aerosol generating device 10 can thus be thermally insulated.

Moreover, arranging the first airflow channel 21 and the second airflow channel 20 on both sides of the heating element 19 can increase the flow of the airflow in the heating cavity 173 , and the airflow can simultaneously flow from both sides of the first side wall 191 . As a result, the suction resistance inside the aerosol generating device 10 is smaller, and it is easier for the user to draw when using the aerosol generating device 10 .

The arrangement of the protrusions 193 can also reduce the contact area between the heating element 19 and the aerosol generating substrate 11 , and the aerosol condensate is less likely to adhere to the first side wall 191 , thereby reducing the adhesion of stains on the heating element 19 . In one embodiment, when the shell of the aerosol-generating substrate 11 is the outer wall of paper, the arrangement of the protrusions 193 can also reduce the contact area between the heating element 19 and the outer wall of the paper, thereby preventing the outer wall of the paper from being baked due to overheating. Prevent the formation of pungent odors, making the user experience better.

In one embodiment, the area of the surface of the protrusion 193 for contacting the aerosol-generating substrate 11 and the area of the inner surface of the first sidewall 191 is 5%-15%, for example, the ratio may be 5% %, 10% or 15%. The surface of the protrusions 193 for contacting the aerosol-generating substrate 11 refers to the surface where the aerosol-generating substrate 11 is provided in the heating element 19 , and the protruding end of the protrusions 193 contacts the aerosol-generating substrate 11 . The smaller the area ratio of the contact surface to the inner surface of the first side wall 191 , that is, the smaller the heat transfer area for heat conduction, the smaller the proportion of heat conduction compared to heat convection in the common heat transfer mode. When the area ratio is between 5% and 15%, heat convection is the main heat transfer mode in the common heat transfer mode, and the heat transfer rate of heat to the aerosol generating substrate 11 is greatly reduced. Due to the decrease in the heat transfer rate between the aerosol generating substrate 11 and the first side wall 191 , the heat transfer rate of the heating element 19 to the outer periphery of the aerosol generating substrate 11 is gradually similar to the heat transfer rate from the outer periphery of the aerosol generating substrate 11 to the interior. , the temperature difference between the inner and outer circumferences of the aerosol-generating substrate 11 will be reduced, effectively solving the problem of uneven temperature distribution inside and outside the aerosol-generating substrate 11 when heated; The heat transfer speed between the heating element 19 and the outer periphery of the aerosol generating substrate 11, and the temperature difference between the inside and outside of the aerosol generating substrate 11 after heating for a period of time tends to 0, and the temperature distribution between the inner and outer periphery is more uniform.

The area ratio of the contact surface to the inner surface of the first side wall 191 cannot be too high or too low. Too high area ratio will reduce the proportion of heat convection in the common heat transfer method, and cannot reduce the amount of heat to the aerosol. The heat transfer rate of the matrix 11 is generated; if the area ratio is too low, the proportion of heat conduction will be too low, and the heating effect will be poor.

In this embodiment, a portion of the first side wall 191 is concave toward the aerosol generating substrate 11 to form a protrusion 193 . In this way, by using a mold, the protrusions 193 are formed by punching from the outer surface of the first side wall 191 to the inside of the first side wall 191 . The processing technology of the protrusions 193 is simple and the cost is low. In other embodiments, the protrusions 193 may be protrusions, and the protrusions are disposed on the inner surface of the first sidewall 191 . The bump can be made of the same material as the first side wall 191, and the bump and the first side wall 191 are integrally formed; the bump can also be different from the material of the first side wall 191, and the bump can be made of a material with poor thermal conductivity. to make. Therefore, when heat is transferred from the bumps 193 to the aerosol-generating substrate 11 by means of thermal conduction, the thermal conductivity of the bumps is poor, and the heat conduction speed will be reduced, which can make the heat transfer from the heating element 19 to the outer periphery of the aerosol-generating substrate 11 possible. The speed is closer to the heat transfer speed from the outer circumference of the aerosol generating substrate 11 to the inside, thereby effectively reducing the temperature difference between the inner and outer circumferences of the aerosol generating substrate 11 and making the inner and outer circumferences more uniform.

In one embodiment, the protrusions 193 have a maximum height of 2mm-5mm. The maximum height of the protrusion 193 refers to the maximum height of the protrusion 193 relative to the inner surface of the first side wall 191 . Adjusting the maximum height of the protrusions 193 can adjust the width of the gap between the heating element 19 and the aerosol generating substrate 11 , thereby controlling the size of the airflow in the second airflow channel 20 to adjust the suction resistance. The smaller the maximum height of the protrusion 193 is, the greater the suction resistance is; on the contrary, the larger the maximum height of the protrusion 193 is, the smaller the suction resistance is.

The number of protrusions 193 may be one or more, one protrusion 193 may be spirally arranged on the inner surface of the first side wall 191 , and a plurality of protrusions 193 may be distributed on the inner surface of the first side wall 191 in the circumferential direction , and/or, a plurality of protrusions 193 are distributed on the inner surface of the first side wall 191 in the axial direction. The greater the number of protrusions 193, the greater the proportion of heat conduction between the heating element 19 and the aerosol-generating substrate 11 to the combined heat transfer of heat conduction and heat convection. When the number of the protrusions 193 is three or more, the plurality of protrusions 193 can be evenly spaced along the circumferential direction, and the plurality of protrusions 193 are in contact with the periphery of the aerosol-generating substrate 11 , so that the aerosol-generating substrate 11 is affected Limit.

The shape of the protrusion 193 may be a regular shape, such as a strip shape, a dot shape, a ring shape, etc., or an irregular shape. In this application, Figures 8 to 11 provide four heating elements 19 having protrusions 193 of different shapes and distributions.

The protrusions 193 in FIG. 8 are strip-shaped, and the strip-shaped protrusions 193 extend from the third opening 192 to an end away from the third opening 192 , that is, extend from the top to the bottom of the first side wall 191 ; a plurality of strip-shaped protrusions The protrusions 193 are distributed on the inner surface of the first side wall 191 at intervals along the circumferential direction. Specifically, the four strip-shaped protrusions 193 are evenly distributed on the inner surface of the first side wall 191 in the circumferential direction. The extending direction of the strip-shaped protrusions 193 may be parallel to the axial direction of the heating element 19 .

The protrusions 193 in FIG. 9 are arc-shaped. One end of the arc-shaped protrusions 193 extends to the other end in the circumferential direction. , the four arc-shaped protrusions 193 are evenly distributed on the inner surface of the first side wall 191 in the circumferential direction; the distribution of the protrusions 193 in FIG. an arc-shaped protrusion 193 . A plurality of annular protrusions 193 may be arranged at intervals in the axial direction of the heating element 19 , and each annular protrusion 193 has a slot or a through hole to form the second airflow channel 20 .

The protrusions 193 in FIG. 10 are point-shaped, and the point-shaped protrusions 193 are distributed on the inner surface of the first side wall 191 in an array. On the inner surface, in other embodiments, the point-like protrusions 193 may also be irregularly distributed on the inner surface of the first side wall 191 . The plurality of point-shaped protrusions 193 may be distributed in multiple rows, each row of point-shaped protrusions 193 is arranged along the axial direction of the heating element 19 , and the multiple rows of point-shaped protrusions 193 are arranged at intervals in the circumferential direction of the heating element 19 . .

The protrusions 193 in FIGS. 11 and 12 are helical, FIG. 11 is a front view of the heating element 19 provided with the helical protrusions 193 , and FIG. 12 is a schematic structural diagram of the heating element 19 provided with the helical protrusions 193 . The helical protrusion 193 in this embodiment is a non-closed ring, so that the second airflow channel 20 can be formed between the inner surface of the first side wall 191 and the aerosol-generating substrate 11, and leads to the aerosol-generating substrate from the third opening 192 One end of 11 facing away from the third opening 192 . In other embodiments, the helical protrusions 193 may also be distributed on the inner surface of the first side wall 191 along the axial direction.

In summary, the shape and distribution of the protrusions 193 should be such that the second airflow channel 20 is formed between the inner surface of the heating element 19 and the aerosol generating substrate 11, and the second airflow channel 20 leads from the top of the heating element 19 to the aerosol generating substrate Bottom of substrate 11. In other embodiments, the shape and distribution of the protrusions 193 are not limited to the above-mentioned manners, and may also be other manners.

Referring to FIG. 7 , in one embodiment, a first limiting member 22 is provided between the outer surface of the first side wall 191 and the inner surface of the second side wall 172 , and the first limiting member 22 connects the heating element 19 The first airflow channel 21 is formed between the first side wall 191 and the inner surface of the heating cavity 173 .

In this embodiment, the first limiting member 22 is annularly sleeved on the outer surface of the first side wall 191, so that there is a gap between the first side wall 191 and the heating cavity 173, so that the first A first airflow channel 21 is formed between the side wall 191 and the inner surface of the heating cavity 173 . The first limiting member 22 has ventilation holes. The ventilation holes on the first limiting member 22 enable the airflow to flow in from the second opening 174 and then flow through the first airflow channel 21 through the ventilation holes of the first limiting member 22 . , and finally flows to the bottom end of the aerosol-generating substrate 11 .

The number of the first limiting member 22 may be one or more. In the present embodiment, the number of the first limiting members 22 is two, which are respectively disposed at one end close to the second opening 174 and one end away from the second opening 174 to limit the upper and lower ends of the heating member 19 at the same time, so that the airflow The first airflow channel 21 can flow from the upper end of the heating member 19 , and can flow into the bottom of the aerosol-generating substrate 11 from the lower end of the heating member 19 .

The first limiting member 22 can be a rubber ring, and the first limiting member 22 can be fixed between the heating base 17 and the heating member 19 by means of tight fitting and bonding, and/or the outer surface of the heating member 19 is protruded There is a first limiting member 22, the first limiting member 22 is integrally formed with the outer surface of the heating member 19; and/or, the inner surface of the heating cavity 173 is protruded with a first limiting member 22, the first limiting member 22 The inner surface of the heating cavity 173 is integrally formed. In the manner in which the first limiting member 22 is protruded on the inner surface of the heating cavity 173 or the outer surface of the heating member 19 , the shape and distribution of the first limiting member 22 are the same as the setting method of the protrusion 193 above, that is, the protrusion 193 is disposed on the outer surface of the heating element 19 to form the first limiting element 22 , and the shape and distribution of the first limiting element 22 will not be described here.

In one embodiment, there is a gap between the bottom wall 171 and the aerosol generating substrate 11, and a third airflow channel 23 is formed between the bottom wall 171 and the aerosol generating substrate 11, and the third airflow channel 23 is connected with the first airflow channel 21 and The second airflow channel 20 communicates with each other. The arrangement of the third airflow channel 23 enables the airflow passing through the first airflow channel 21 and the second airflow channel 20 to finally flow to the end of the aerosol generating substrate 11 away from the third opening 192 .

In one embodiment, the first side wall 191 abuts against the bottom wall 171 , the end of the first side wall 191 close to the bottom wall 171 has an opening, and the opening penetrates the first side wall 191 and communicates with the third airflow channel 23 and the The first airflow channel 21 , so that the airflow of the first airflow channel 21 can pass to the third airflow channel 23 and finally flow to the end of the aerosol generating substrate 11 away from the third opening 192 .

In this embodiment, a first limiting member 22 is provided between the first side wall 191 and the second side wall 172 , and the first limiting member 22 is used to limit the radial direction of the heating member 19 in the heating cavity 173 , so that the first side wall 191 and the bottom wall 171 are spaced apart, so that the third airflow channel 23 is communicated with the first airflow channel 21; the airflow of the first airflow channel 21 can lead to the third airflow channel 23, and finally flows to the One end of the aerosol-generating substrate 11 facing away from the third opening 192 .

In this embodiment, the end of the bottom wall 171 opposite to the second opening 174 is protruded with a second limiting member 176 , the second limiting member 176 has a through hole, and the end of the heating member 19 opposite to the third opening 192 has a first Four openings 194 . The second limiting member 176 is used to limit the axial direction of the aerosol generating substrate 11 in the heating chamber 173 . The aerosol-generating substrate 11 is inserted into the heating cavity 173 and abuts against the second limiting member 176, so that there is a gap between the bottom of the aerosol-generating substrate 11 and the inner surface of the bottom wall 171, and a third airflow channel 23 is formed, and the airflow can be The first airflow channel 21 and the second airflow channel 20 flow into the third airflow channel, and finally flow to the bottom of the aerosol-generating substrate 11 .

In the manner in which the second limiting member 176 is disposed on the bottom wall 171 , part or all of the second limiting member 176 extends into the fourth opening 194 and abuts the bottom of the aerosol generating substrate 11 , or the second limiting member One end of 176 close to the fourth opening 194 is flush with the fourth opening 194 and abuts the bottom of the aerosol-generating substrate 11 . That is, the maximum height of the second limiting member 176 is higher than or equal to the maximum distance between the fourth opening 194 and the bottom of the heating cavity 173 . Therefore, the end of the aerosol-generating substrate 11 away from the fourth opening 194 can be disposed inside the heating element 19 , and the first airflow channel 21 and the second airflow channel 20 can be more fully utilized, so that the overall temperature of the aerosol-generating substrate 11 can be The distribution is more even. The maximum height of the second limiting member 176 is also not likely to be too high, as long as the aerosol generating substrate 11 can be sufficiently baked and the first airflow channel 21 and the second airflow channel 20 can be fully utilized.

In other embodiments, the second limiting member 176 may be protruded from one end of the first side wall 191 close to the bottom wall 171 , and the second limiting member 176 abuts against the bottom surface of the aerosol generating substrate 11 , so that the aerosol generating substrate 11 is confined in the heating element 19; the first limiting element 22 limits the axial direction of the heating element 19 in the heating chamber 173, and meanwhile the aerosol generating substrate 11 is confined in the heating chamber 173, so that the There is a gap between the bottom and the inner surface of the bottom wall 171, and a third airflow channel 23 is formed, and the airflow can flow into the third airflow channel from the first airflow channel 21 and the second airflow channel 20, and finally flow to the aerosol generating substrate 11. bottom.

In other embodiments, the second limiting member 176 may be protruded from one end of the second side wall 172 close to the bottom wall 171 . The second limiting member 176 abuts against the bottom surface of the aerosol-generating substrate 11 and the end of the first side wall 191 close to the bottom wall 171 , that is, the second limiting member 176 simultaneously limits the aerosol-generating substrate 11 and the heating member 19 during heating Axial direction in cavity 173 . In this embodiment, the second limiting member 176 forms a gap between the bottom of the aerosol generating substrate 11 and the inner surface of the bottom wall 171, and forms the third airflow channel 23; at the same time, the first side wall 191 and the bottom wall 171 There is a gap therebetween, so that the airflow can flow from the first airflow channel 21 into the third airflow channel, and finally flow to the bottom of the aerosol-generating substrate 11 .

The above are only the embodiments of the present application, and are not intended to limit the scope of the patent of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, or directly or indirectly applied in other related technical fields, All are similarly included in the scope of patent protection of the present application.

Claims (12)

An aerosol generating device, comprising: Heating base with heating cavity; a heating element for accommodating and heating the aerosol generating substrate, the heating element is arranged in the heating cavity; The heating element includes a first side wall, and a first airflow channel is formed between the first side wall and the inner surface of the heating cavity; the inner surface of the first side wall is provided with a protrusion, and the protrusion A second airflow channel is formed between the first side wall and the aerosol generating substrate, and both the first airflow channel and the second airflow channel lead to the heating chamber from the outside of the aerosol generating device bottom of. The aerosol-generating device according to claim 1, wherein the area of the surface of the protrusion for contacting the aerosol-generating substrate with the area of the inner surface of the first side wall is 5%- 15%. The aerosol generating device according to claim 1, wherein the protrusion has a maximum height of 2mm-5mm. The aerosol generating device according to claim 1, wherein the first side wall is arranged in a ring shape; the protruding spiral is arranged on the inner surface of the first side wall; The protrusions are arranged at intervals on the inner surface of the first side wall along the circumferential direction; or, a plurality of arc-shaped projections are arranged at intervals on the inner surface of the first side wall along the circumferential direction; or, a plurality of The dot-shaped protrusions are distributed on the inner surface of the first side wall in an array; The annular protrusion has a slot or a through hole. The aerosol generating device of claim 1, wherein the first sidewall portion is concave to form the protrusion. The aerosol generating device according to claim 1, wherein the first side wall is annularly arranged, and the heating element and the heating base are arranged coaxially. The aerosol generating device according to claim 1, wherein the heating seat comprises a second side wall, a first limiting member is provided between the first side wall and the second side wall, and the first stopper is provided between the first side wall and the second side wall. A limiting member is spaced between the first side wall and the second side wall, so that a first airflow channel is formed between the first side wall and the inner surface of the heating cavity. The aerosol generating device according to claim 7, wherein the outer surface of the first side wall is convex to form the first limiting member; and/or the inner surface of the second side wall is convex to form the first limiter. The aerosol generating device according to claim 1, wherein the heating base comprises a second side wall and a bottom wall, and the second side wall and the bottom wall surround the heating chamber; the bottom wall A third airflow channel is formed between the aerosol generating substrate and the third airflow channel, and the third airflow channel is communicated with the first airflow channel and the second airflow channel. The aerosol generating device according to claim 9, wherein a first limiting member is provided between the first side wall and the second side wall, and the first limiting member is used to limit the a heating element to communicate the third airflow channel with the first airflow channel. The aerosol generating device according to claim 9, wherein the first side wall abuts against the bottom wall, and an end of the first side wall close to the bottom wall has an opening, so that the The third airflow channel communicates with the first airflow channel. The aerosol generating device according to any one of claims 9-11, wherein the bottom wall or the first side wall or the second side wall is provided with a second limit member; the second limit A spacer separates the aerosol-generating substrate and the bottom wall to form the third airflow channel.

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