Aerosol-generating device

Abstract

The application relates to an aerosol generating device, which comprises an outer conductor and an inner conductor assembly coaxially arranged in the outer conductor. The outer conductor has a closed end and an open end arranged oppositely, and the inner conductor assembly extends from the closed end to the open end. The length of the inner conductor assembly in the outer conductor is adjustable. In the aerosol generating device, an aerosol generating substrate can be inserted into the outer conductor through the open end and arranged in the inner conductor assembly. Microwaves in the outer conductor can heat the aerosol generating substrate to generate aerosols. As the aerosol generating substrate is continuously heated and atomized, the dielectric properties of the aerosol generating substrate change. By adjusting the length of the inner conductor assembly in the outer conductor, the resonant frequency in the outer conductor can be adjusted to maintain a stable resonant frequency, so that the microwaves in the outer conductor have a high coupling efficiency with the aerosol generating substrate, thereby maintaining a high heating speed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of atomization technology, in particular to an aerosol generating device. BACKGROUND

[0002] An aerosol is a colloidal dispersion system formed by dispersing and suspending small particles of solid or liquid in a gaseous medium. Since aerosols can be absorbed by the human body through the respiratory system, they provide a new type of alternative absorption method for users. An aerosol generating device is a device that forms an aerosol by heating or ultrasonic means from a stored aerosol generating substrate. The aerosol generating substrate can be a liquid, a gel, a paste or a solid. Atomizing these aerosol generating substrates can deliver aerosols for inhalation to users, replacing conventional product forms and absorption methods.

[0003] However, the current aerosol generating device mainly uses heat conduction to heat the aerosol generating substrate, which has the defects of long preheating time and uneven heating. As a new type of heating technology, microwave heating heats the aerosol generating substrate by microwave radiation, has the advantages of fast heating speed and good uniformity, and is gradually applied to aerosol generating devices. However, during the heating process, as the dielectric properties of the aerosol generating substrate change, the heating efficiency gradually decreases, thereby failing to effectively take advantage of the fast heating speed of microwave heating. SUMMARY

[0004] Therefore, it is necessary to provide an aerosol generating device to solve the problem that the heating efficiency of microwave heating gradually decreases as the aerosol generating substrate is consumed.

[0005] According to an aspect of the present application, an aerosol generating device is provided, which includes an outer conductor and an inner conductor assembly coaxially arranged in the outer conductor, the outer conductor having a closed end and an open end arranged opposite to each other, and the inner conductor assembly extending from the closed end towards the open end.

[0006] The length of the inner conductor assembly in the outer conductor is adjustable.

[0007] In one embodiment, the inner conductor assembly includes a conductor piece and an adjusting piece, the conductor piece is arranged at the closed end, and one end of the adjusting piece extends out of one end of the conductor piece away from the closed end.

[0008] The adjusting piece can be relatively close to or away from the open end.

[0009] In one of the embodiments, the conductor member is in a columnar shape, and an accommodation cavity is formed between an end face of the conductor member close to the open end and the open end, and the adjusting member extends into the accommodation cavity.

[0010] In one of the embodiments, one end of the adjusting member away from the open end extends out of the closed end through the conductor member.

[0011] In one of the embodiments, the aerosol generating device further comprises a driving module, which is in transmission connection with one end of the adjusting member extending out of the closed end, and is used to drive the adjusting member to be close to or away from the open end.

[0012] In one of the embodiments, the driving module comprises a driving member and a transmission rod, the driving member is in transmission connection with the adjusting member through the transmission rod, and the transmission rod is retractable in a direction from the closed end to the open end under the drive of the driving member.

[0013] In one of the embodiments, the inner conductor assembly is configured to be able to be relatively close to or away from the open end.

[0014] In one of the embodiments, the aerosol generating device further comprises a driving module, which is in transmission connection with the inner conductor assembly, and is used to drive the inner conductor assembly to be close to or away from the open end.

[0015] In one of the embodiments, the aerosol generating device further comprises:

[0016] a microwave generating module, which is located outside one side of the closed end; and

[0017] a coupling antenna, one end of which is connected to the microwave generating module, and the other end of which extends into the outer conductor through the closed end.

[0018] In one of the embodiments, the aerosol generating device further comprises a power supply unit, which is located outside one side of the closed end, and is in electrical connection with the microwave generating module to supply power for the microwave generating module.

[0019] In one of the embodiments, the aerosol generating device further comprises a reflected wave detection unit, which is used to detect the reflected power in the outer conductor.

[0020] In one of the embodiments, the aerosol generating device further comprises a temperature detection unit, which is used to detect the temperature of the heated object in the outer conductor.

[0021] The aerosol generating device, the aerosol generating substrate can be inserted into the outer conductor through the open end and inserted into the inner conductor assembly, and the microwaves in the outer conductor can heat the aerosol generating substrate to generate aerosol. As the aerosol generating substrate is continuously heated and atomized, the dielectric properties of the aerosol generating substrate change, and by adjusting the length of the inner conductor assembly in the outer conductor, the resonant frequency in the outer conductor can be adjusted to maintain a stable resonant frequency, thereby maintaining a high coupling efficiency between the microwaves in the outer conductor and the aerosol generating substrate, thereby maintaining a high heating speed. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A schematic view of an aerosol generating device according to an embodiment of the present application;

[0023] Figure 2 A schematic view of an aerosol generating device according to an embodiment of the present application; Figure 1 A schematic view of an aerosol generating device according to an embodiment of the present application;

[0024] DETAILED DESCRIPTION

[0025] 100, aerosol generating device; 10, housing; 20, outer conductor; 20a, closed end; 20b, open end; 21, outer conductor bottom wall; 23, outer conductor side wall; 30, inner conductor assembly; 32, conductor piece; 34, adjustment piece; 40, accommodation cavity; 50, control module; 60, driving module; 72, microwave generating module; 74, coupling antenna; 80, power supply unit. DETAILED DESCRIPTION

[0026] To make the above purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below in conjunction with the drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

[0028] In addition, the terms "first", "second", etc. are used only for descriptive purposes and do not connote or imply a relative importance or an ordering between or among the indicated features. Thus, a feature defined with "first", "second", etc. can include at least one of the features, explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is at least two, for example, two, three, etc., unless explicitly specified and limited otherwise.

[0029] In the present application, unless specifically defined and limited otherwise, the terms "mount", "connect", "connection", "fixed", etc. are used broadly and are not limited to the direct and tight connection, but can be removable or integral; can be mechanical connection or electrical connection; can be direct connection or indirect connection through intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0031] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0032] Reference Figure 1 , Figure 1 A schematic diagram of an aerosol generating device in an embodiment of the present application is shown. The aerosol generating device provided in the embodiment of the present application is used to microwave heat an aerosol generating substrate to generate aerosol for a user. The aerosol generating substrate is in the form of a solid, including but not limited to plant materials for medical, health, health, beauty purposes, such as roots, stems, leaves, flowers, buds, seeds, etc. In the following embodiments, the aerosol generating substrate is in a cylindrical structure that can be inserted into the aerosol generating device.

[0033] As described in the background, the commonly used resistance heating is to heat the resistance element by an external power supply, and the heat resistance element transmits heat to the aerosol generating substrate by heat conduction. Therefore, the conventional resistance heating has the following disadvantages: 1. The local position of the aerosol generating substrate in contact with the heating element has a higher temperature, and other positions cannot quickly receive heat, there is a certain temperature gradient, the heating is uneven, and the smoking taste is affected; 2. During the smoking process, the heating element continues to heat up, which has potential safety risks and is easy to produce harmful substances at high temperature; 3. The aerosol generating substrate is in contact with the heating element for a long time, which is easy to accumulate carbon and produce a burnt taste, and cleaning is also very inconvenient; 4. A large temperature difference is needed between the heating element and the heated aerosol generating substrate to shorten the preheating time, resulting in high temperature of the electronic atomization device and high cost of heat insulation.

[0034] Microwave heating is a heating technology that heats the aerosol generating substrate by microwave radiation, so that the aerosol generating substrate generates aerosol by self-dielectric loss heating. Since it does not need a heating body to transfer heat, it can solve the above problems of resistance heating. However, the inventors found during research that microwave heating has selectivity, and there is a corresponding energy coupling between microwaves and the heated object, that is, the efficiency of converting microwave energy into heated energy. Only when the coupling efficiency is high, can the advantages of microwave heating be brought into play.

[0035] During the heating process, the temperature of the aerosol generating substrate is heated from room temperature to above 300℃, and the mass of the aerosol generating substrate is reduced by about 40% after the volatile components are atomized, and carbonization of fibers occurs at the same time. Therefore, the dielectric properties of the aerosol generating substrate change dramatically, the microwave energy cannot always act on the aerosol generating substrate of the same material and dielectric properties, the microwave energy loading cannot always be impedance matched, and the resonant frequency of the heating resonant cavity cannot be maintained at the frequency of the microwave emission source. The microwave coupling efficiency cannot always be maintained at a high level, resulting in a decrease in heating efficiency.

[0036] Please refer to Figure 1 and Figure 2 In order to solve the above problems, it is required that the resonant frequency of the resonant cavity is consistent with the microwave frequency during the entire heating process, so as to ensure a high coupling efficiency, so that the speed advantage of microwave heating can be brought into play. Based on this, the aerosol generating device 100 of the present application comprises a shell 10, an outer conductor 20 and an inner conductor assembly 30. The outer conductor 20 is accommodated in the shell 10, and the inner conductor assembly 30 is coaxially arranged in the outer conductor 20. The outer conductor 20 has a closed end 20a and an open end 20b arranged oppositely. The inner conductor assembly 30 extends from the closed end 20a to the open end 20b, and the length of the inner conductor assembly 30 in the outer conductor 20 is adjustable.

[0037] Thus, the aerosol generating substrate can be inserted into the outer conductor 20 through the open end 20b and disposed in the inner conductor assembly 30, and the microwaves in the outer conductor 20 can heat the aerosol generating substrate to generate aerosol. As the aerosol generating substrate is continuously heated and atomized, the dielectric properties of the aerosol generating substrate change, and by adjusting the length of the inner conductor assembly 30 in the outer conductor 20, the resonant frequency in the outer conductor 20 can be adjusted to maintain a stable resonant frequency, thereby maintaining a high coupling efficiency between the microwaves in the outer conductor 20 and the aerosol generating substrate, thereby maintaining a high heating speed.

[0038] Specifically, the shell 10 has an open-ended cylindrical structure, including a shell 10 bottom wall and a shell 10 side wall extending from the edge of the shell 10 bottom wall in the same direction, and the end of the shell 10 side wall away from the shell 10 bottom wall forms an opening communicating with the external environment. In the following examples, the axial direction of the shell 10 is defined as the first direction. It can be understood that the shape of the shell 10 is not limited and can be set as needed to meet different requirements.

[0039] The outer conductor 20 is received in the end of the shell 10 away from the shell 10 bottom wall, and the outer conductor 20 has an open-ended cylindrical structure, the central axis of the outer conductor 20 coincides with the central axis of the shell 10, and the outer conductor 20 includes an outer conductor bottom wall 21 and an outer conductor side wall 23 extending from the edge of the outer conductor bottom wall 21 in the same direction. The outer conductor 20 has a closed end 20a at one end of the outer conductor bottom wall 21, and the end of the outer conductor 20 away from the outer conductor bottom wall 21 extends out of the opening of the shell 10 to form an open end 20b communicating with the external environment.

[0040] In some embodiments, the inner conductor assembly 30 includes a conductor piece 32 and an adjusting piece 34. The conductor piece 32 is fixedly arranged at the closed end 20a, and one end of the adjusting piece 34 extends out of the end of the conductor away from the closed end 20a. The adjusting piece 34 can move relative to the conductor piece 32 to relatively approach or move away from the open end 20b.

[0041] Specifically, the conductor piece 32 protrudes at the center position of the side of the outer conductor bottom wall 21 where the outer conductor side wall 23 is provided, and the conductor piece 32 has a columnar shape coaxial with the outer conductor 20. The outer contour of the cross section perpendicular to the axial direction of the conductor piece 32 is circular or polygonal. The end surface of the conductor piece 32 near the open end 20b forms a receiving cavity 40 for accommodating the aerosol generating substrate between the end surface and the open end 20b.

[0042] Further, the outer conductor 20 and the conductor piece 32 are integrally formed, and the outer conductor 20 and the conductor piece 32 are each formed of one or more of copper, aluminum, or stainless steel or other metal materials or other non-metal conductive materials. In this way, the outer conductor 20 and the conductor piece 32 jointly define a coaxial resonant cavity, which has the advantages of small volume and large power, thereby reducing the overall volume of the aerosol generating device 100 and improving the portability of the aerosol generating device 100.

[0043] It can be understood that in some other embodiments, the outer conductor 20 and the conductor piece 32 can also be made of conductive materials or non-conductive materials by providing a conductive layer on the outer wall surface of the outer conductor 20 and the conductor piece 32, which can be, for example, a gold plating, silver plating, or copper plating.

[0044] The adjusting piece 34 is formed of copper, aluminum, stainless steel, graphite, or other conductive materials, and the adjusting piece 34 has a needle-like structure or a sheet-like structure. One end of the adjusting piece 34 is connected to the conductor piece 32, and the other end of the adjusting piece 34 extends into the accommodating cavity 40. In this way, one end of the adjusting piece 34 can extend into the inside of the aerosol generating substrate inserted into the accommodating cavity 40, so that the microwave energy is further transmitted from the conductor piece 32 to the aerosol generating substrate for resonant heating.

[0045] Since the microwave heating electric field is concentrated near the top end of the adjusting piece 34 toward the open end 20b of the outer conductor 20, according to electromagnetic field theory, the dielectric properties of the aerosol generating substrate in this region have a greater impact on the resonant frequency in the outer conductor 20. At the same time, the aerosol generating substrate in this region is heated faster and is more likely to be burnt, thereby affecting the user's smoking experience.

[0046] During the heating process, as the temperature of the aerosol generating substrate rises and the moisture and substances are lost, the dielectric loss gradually decreases, and the resonant frequency in the outer conductor 20 moves to a higher frequency. Therefore, the adjusting piece 34 can be controlled to gradually move toward the open end 20b of the outer conductor 20, so that the frequency in the outer conductor 20 shifts to a lower frequency, and the microwave field strength gradually moves toward the open end 20b of the outer conductor 20 as the adjusting piece 34 moves.

[0047] In this way, the resonant frequency in the outer conductor 20 can always be within the ideal range, so that the coupling efficiency of the microwave and the outer conductor 20 is always maintained above 96%, ensuring a high heating efficiency and a low energy consumption throughout the heating process. Moreover, since the microwave field strength gradually moves toward the open end 20b of the outer conductor 20 as the adjusting piece 34 moves, the aerosol generating substrate can be heated in different regions, thereby avoiding the situation where a certain part of the aerosol generating substrate is always in a high field strength region and is burnt due to excessively high temperature, and improving the smoking taste and smoking consistency.

[0048] Please continue to refer to Figure 2 , the aerosol generating device 100 further comprises a control module 50 and a driving module 60, both of which are accommodated in the shell 10 and arranged adjacent to the outer conductor 20 in the axial direction of the shell 10, the control module 50 is in communication connection with the driving module 60, the driving module 60 is located outside the closed end 20a of the outer conductor 20, one end of the adjusting member 34 passes through the conductor member 32 and the outer conductor bottom wall 21 in the first direction in turn, thereby extending out of the closed end 20a of the outer conductor 20 to be in transmission connection with the driving module 60, the driving module 60 can drive the adjusting member 34 to approach or move away from the open end 20b under the control of the control module 50. In this way, the working state of the driving module 60 can be controlled by the control module 50, that is, the length of the adjusting member 34 extending into the outer conductor 20 can be adjusted, and then the length of the inner conductor assembly 30 in the outer conductor 20 is changed, so that the resonant frequency in the outer conductor 20 is changed, and then the coupling efficiency between the microwave and the outer conductor 20 is maintained. In some embodiments, the driving module 60 includes a driving member and a transmission rod, the output end of the driving member is connected to the adjusting member 34 through the transmission rod, and the transmission rod can be continuously or intermittently telescopic in the direction from the closed end 20a to the open end 20b under the drive of the driving member, so as to adjust the length of the adjusting member 34 extending into the outer conductor 20. It can be understood that the control module 50 can control the telescopic direction, telescopic frequency and telescopic amplitude of the adjusting member 34 by controlling the working state of the driving member, so as to accurately control the length of the adjusting member 34 extending into the outer conductor 20. It should be noted that the specific structure of the transmission rod does not belong to the main point of the present application, and therefore will not be described here. Structures that can be telescopic under the drive of the driving member can be applied to the transmission rod.

[0049] In some other embodiments, one end of the adjusting member 34 extending towards the closed end 20a of the outer conductor 20 is completely accommodated in the conductor member 32, and one end of the driving module 60 can extend into the conductor member 32 to be in transmission connection with the adjusting member 34.

[0050] In some other embodiments, the inner conductor assembly 30 is configured to be capable of relatively approaching or moving away from the open end 20b of the outer conductor 20, that is, the inner conductor assembly 30 is movably connected to the outer conductor 20, the inner conductor assembly 30 is in transmission connection with the driving module 60, and the inner conductor assembly 30 can be integrally moved relative to the outer conductor 20 to approach or move away from the open end 20b under the drive of the driving module 60.

[0051] The aerosol generating device 100 further comprises a microwave generating module 72 and a coupling antenna 74. The microwave generating module 72 is accommodated in one end of the housing 10 and located outside one side of the closed end 20a of the outer conductor 20, and is located on one side of the control module 50 in the radial direction of the housing 10 and is in communication connection with the control module 50, for generating microwaves under the control of the control module 50. The coupling antenna 74 has a columnar structure, one end of the coupling antenna 74 is connected to the microwave generating module 72, and the other end extends into the outer conductor 20 along the first direction through the closed end 20a of the outer conductor 20. In this way, under the control of the control module 50, the microwaves generated by the microwave generating module 72 are fed into the outer conductor 20 through the coupling antenna 74.

[0052] In a specific embodiment, the microwave generating module 72 is formed by a magnetron or a solid-state source, and the frequency can be selected from the frequencies between 433 MHZ and 24.5 GHZ that can be used for microwave heating, and preferably 2.45 GHZ and 5.8 GHZ. Among them, the solid-state source can realize low-voltage battery power supply (such as 12-48V), and at the same time, the volume is smaller, and the low-power output control is more accurate.

[0053] In some embodiments, the aerosol generating device 100 further comprises a power supply unit 80, which is accommodated in one end of the housing 10 and located outside one side of the closed end 20a, and the power supply unit 80 is located on the side of the control module 50 away from the microwave generating module 72 in the radial direction of the housing 10, and the power supply unit 80 is in electrical connection with the microwave generating module 72 to supply power to the microwave generating module 72. As a preferred embodiment, the power supply unit 80 comprises a rechargeable battery, so that the aerosol generating device 100 can be externally connected to a power source to repeatedly charge the power supply unit 80.

[0054] In some embodiments, the aerosol generating device 100 further comprises a reflected wave detection unit (not shown), which is integrated in the microwave generating module 72, and the reflected wave detection unit is used to detect the reflected power in the outer conductor 20 and feedback to the control module 50. When the coupling efficiency of the microwave and the outer conductor 20 changes, the intuitive manifestation is the change of the reflected power in the outer conductor 20. The greater the deviation of the resonant frequency in the outer conductor 20 compared with the frequency of the microwave generated by the microwave generator, the lower the coupling efficiency and the greater the reflected power.

[0055] In this way, by detecting the reflected power in the outer conductor 20 through the reflected wave detection unit, the coupling efficiency of the microwave and the outer conductor 20 can be monitored in real time, and the control module 50 can control the driving module 60 to adjust the length of the inner conductor assembly 30 extending into the outer conductor 20 according to the reflected power in the outer conductor 20. In order to achieve ideal heating efficiency, the reflected power is not more than 4% by controlling the length of the inner conductor assembly 30 extending into the outer conductor 20, so that the coupling efficiency is not less than 96%.

[0056] In some other embodiments, the aerosol generating device 100 further comprises a temperature detecting unit (not shown in the figure) which is communicatively connected with the control module 50 and is configured to detect the temperature of the heated substance (i.e. the aerosol generating substrate) in the accommodating cavity 40 and feed back to the control module 50. The control module 50 can control the driving module 60 to adjust the length of the adjusting member 34 extending into the outer conductor 20 according to the temperature of the aerosol generating substrate.

[0057] Specifically, the temperature detecting unit can be a thermocouple temperature sensor, a TCR temperature sensor, an optical fiber temperature sensor, or an infrared temperature sensor, etc.

[0058] In some embodiments, the outer conductor 20 is provided with air inlet holes (not shown in the figure) which are in communication with the atmosphere. In this way, the air in the ambient environment can enter the shell 10, then enter the outer conductor 20 through the air inlet holes, and finally carry the aerosol generated by heating the aerosol generating substrate out of the open end 20b of the outer conductor 20 for the user to smoke. It can be understood that the number and position of the air inlet holes are not limited, and in some embodiments, the air inlet holes are provided on the outer conductor bottom wall 21 of the outer conductor 20.

[0059] The above-mentioned aerosol generating device 100 can adjust the length of the inner conductor assembly 30 in the outer conductor 20 in real time, thereby adjusting the resonant frequency of the outer conductor 20 in real time, so as to prevent the resonant frequency in the outer conductor 20 from drifting with the change of the dielectric property of the aerosol generating substrate during the heating process, thereby reducing the coupling efficiency of the microwave and the resonant frequency. Moreover, the position of the microwave field intensity region can also be changed to realize the zoned and segmented heating of the aerosol generating substrate, thereby improving the taste and consistency.

[0060] The technical features of the above-mentioned embodiments can be combined in any manner. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0061] The above-mentioned embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An aerosol-generating device, characterized by, The aerosol generating device comprises a microwave generating module, a coupling antenna, an outer conductor and an inner conductor assembly coaxially arranged in the outer conductor, the outer conductor has an opposite closed end and an open end, the inner conductor assembly comprises a conductor piece and an adjusting piece, the conductor piece is arranged at the closed end, the conductor piece is columnar, an end face of the conductor piece close to the open end and the open end form a receiving cavity, one end of the adjusting piece extends out of one end of the conductor piece away from the closed end and extends into the receiving cavity, one end of the adjusting piece away from the open end extends out of the closed end through the conductor piece, the microwave generating module is located outside one side of the closed end, one end of the coupling antenna is connected to the microwave generating module, and the other end extends into the outer conductor through the closed end; The outer conductor and the conductor piece jointly define a resonant cavity, and the length of the inner conductor assembly in the outer conductor is adjustable to adjust the resonant frequency of the resonant cavity.

2. The aerosol-generating device of claim 1, wherein, The aerosol generating device further comprises a driving module, the driving module is drivingly connected to one end of the adjusting piece extending out of the closed end, and is used for driving the adjusting piece to be close to or away from the open end.

3. The aerosol-generating device of claim 2, wherein, The driving module comprises a driving piece and a transmission rod, the driving piece is drivingly connected to the adjusting piece through the transmission rod, and the transmission rod can be telescoped in a direction from the closed end to the open end under the drive of the driving piece.

4. The aerosol-generating device of claim 1, wherein, The inner conductor assembly is configured to be capable of being relatively close to or away from the open end.

5. The aerosol-generating device of claim 4, wherein, The aerosol generating device further comprises a driving module, the driving module is drivingly connected to the inner conductor assembly, and the driving module is used for driving the inner conductor assembly to be close to or away from the open end.

6. The aerosol-generating device of claim 1, wherein, The aerosol generating device further comprises a power supply unit, the power supply unit is located outside one side of the closed end, the power supply unit is electrically connected with the microwave generating module to supply power for the microwave generating module.

7. The aerosol-generating device of claim 1, wherein, The aerosol generating device further comprises a reflected wave detection unit, the reflected wave detection unit is used for detecting the reflected power in the outer conductor.

8. The aerosol-generating device of claim 1, wherein, The aerosol generating device further comprises a temperature detection unit, the temperature detection unit is used for detecting the temperature of the heated object in the outer conductor.

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