Microwave heating assembly and aerosol generating device

Abstract

The invention discloses a microwave heating assembly and an aerosol generating device. The microwave heating assembly comprises a first outer conductor, a first inner conductor and an impedance matching structure, the first outer conductor is cylindrical and comprises a closed end and an open end, and a cavity is defined between the closed end and the open end; the first inner conductor is arranged in the cavity; the impedance matching structure is arranged outside the cavity and is connected with the first inner conductor. The impedance matching structure is arranged outside the cavity, so that the size of the cavity is reduced, the size of the first outer conductor is reduced, the size of the microwave heating assembly is reduced, and miniaturization of the aerosol generating device is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic atomization devices, and in particular to a microwave heating component and an aerosol generating device. Background Art

[0002] The heating temperature of heat-not-burn technology is generally between 50°C and 350°C. Compared with ordinary combustible cigarettes, heat-not-burn cigarettes can significantly reduce the release of harmful substances in tobacco while retaining the taste of traditional cigarettes. One of the heating forms is microwave heating, which has the advantages of high heating efficiency and fast aerosol generation. Existing aerosol generating devices with microwave heating usually include an outer conductor unit and an inner conductor unit. The inner conductor unit and the aerosol generating matrix to be heated and atomized are placed together in the cavity defined by the outer conductor unit. The principle of microwave heating involves impedance matching. The meaning of impedance matching is that the characteristic impedance of the transmission line is equal to the load impedance in magnitude and the same in phase. At this time, the energy on the transmission line is transmitted to the load with almost no reflection. Due to the requirement of impedance matching, the inner conductor unit needs to have sufficient volume and length, so that the inner conductor unit occupies a relatively large space in the cavity, which is not conducive to the miniaturization of the aerosol generating device. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an improved microwave heating component and an aerosol generating device, which is conducive to the miniaturization of the aerosol generating device.

[0004] The technical solution adopted by the present invention to solve its technical problems is: to provide a microwave heating component, which includes a first outer conductor, a first inner conductor and an impedance matching structure; the first outer conductor is in a cylindrical shape and includes a closed end and an open end, and a cavity is defined between the closed end and the open end; the first inner conductor is arranged in the cavity; the impedance matching structure is arranged outside the cavity and is connected to the first inner conductor.

[0005] Preferably, the impedance matching structure surrounds the first outer conductor;

[0006] And / or, the impedance matching structure is a flexible structure.

[0007] Preferably, the impedance matching structure is in a strip shape and has a central axis, and the impedance matching structure includes at least one inductance enhancement section and / or at least one capacitance enhancement section along the extension direction of the central axis.

[0008] Preferably, the impedance matching structure further has a cross-section perpendicular to the central axis, and the impedance matching structure includes a second inner conductor, a second outer conductor coaxially arranged, and a dielectric layer arranged between the second inner conductor and the second outer conductor along its cross-section direction;

[0009] The dielectric layer at the inductance enhancement section is air;

[0010] The outer diameter of the dielectric layer at the capacitance enhancement section is greater than the diameter of the second inner conductor and less than the standard outer diameter.

[0011] Preferably, the inductance enhancement section and the capacitance enhancement section are arranged alternately.

[0012] Preferably, the impedance matching structure further includes at least one standard characteristic impedance section along the extension direction of the central axis; the standard characteristic impedance section is connected to the inductance enhancement section and / or the capacitance enhancement section.

[0013] Preferably, the first inner conductor includes a first end connected to the impedance matching structure and a second end far from the impedance matching structure;

[0014] The second end of the first inner conductor is closer to the bottom wall of the cavity than its first end; and / or,

[0015] The extension trajectory of the first inner conductor from its first end to its second end is a straight line, a curve, or a combination of a straight line and a curve.

[0016] Preferably, the first inner conductor is in a long strip shape and includes at least two conductor segments;

[0017] When the first inner conductor includes two conductor segments, the two conductor segments are joined at an angle;

[0018] When the first inner conductor includes more than two conductor segments, each conductor segment is connected in sequence, and an angle is formed between adjacent two conductor segments.

[0019] Preferably, the microwave heating assembly further includes a fixing seat for accommodating the aerosol generating matrix; the fixing seat is arranged in the cavity.

[0020] The present invention also provides an aerosol generating device, which includes a microwave generating unit and the microwave heating assembly according to any one of the above, and the microwave heating assembly further includes a microwave feeding unit connected between the impedance matching structure and the microwave generating unit, and the microwave feeding unit feeds the microwave generated by the microwave generating unit into the accommodating cavity.

[0021] The present invention has at least the following beneficial effects: The present invention arranges the impedance matching structure outside the accommodating cavity, which is beneficial to reducing the volume of the accommodating cavity, thereby being beneficial to reducing the volume of the first outer conductor, that is, being beneficial to reducing the volume of the microwave heating assembly, and thus being beneficial to the miniaturization of the aerosol generating device. Description of the Drawings

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. In the accompanying drawings:

[0023] Figure 1 is a schematic diagram of the overall structure of the microwave heating component according to the first embodiment of the present invention;

[0024] Figure 2 is Figure 1 a top view structural diagram;

[0025] Figure 3 is Figure 2 a sectional view taken along line A-A in

[0026] Figure 4 is a longitudinal sectional structural diagram of the microwave heating component according to the second embodiment of the present invention;

[0027] Figure 5 is Figure 1 a cross-sectional structural diagram of the impedance matching structure of the microwave heating component shown;

[0028] Figure 6 is Figure 1 a schematic diagram of the impedance matching model of the microwave heating component shown;

[0029] Figure 7 is Figure 1 a structural diagram of the impedance matching structure of the microwave heating component shown;

[0030] Figure 8 is a reflection coefficient diagram of the aerosol generating device according to an embodiment of the present invention;

[0031] Figure 9 is a schematic diagram of the electric field intensity distribution of the aerosol generating device according to an embodiment of the present invention;

[0032] Figure 10 is a structural diagram of the impedance matching structure of the microwave heating component according to the third embodiment of the present invention;

[0033] Figure 11 is a structural diagram of the impedance matching structure of the microwave heating component according to the fourth embodiment of the present invention;

[0034] Figure 12 is Figure 1 an exploded structural diagram of the microwave heating component shown. Detailed implementation manners

[0035] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0036] The terms "first", "second", etc. are only for facilitating the description of the present technical solution, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Please refer to Figures 1 to 3 , the aerosol generating device provided by the present invention includes a microwave generating unit (not shown) and a microwave heating assembly 1. The microwave heating assembly 1 can utilize microwaves to heat an aerosol generating substrate 2 (not shown) to atomize and generate an aerosol for the user to inhale. In some embodiments, the aerosol generating substrate 2 is a solid aerosol generating substrate 2 such as a processed plant leaf product. It can be understood that, in other embodiments, the aerosol generating substrate 2 can also be a liquid aerosol generating substrate 2.

[0038] As Figure 3 shown, in the first embodiment of the present invention, the microwave heating assembly 1 includes a first outer conductor 10, a first inner conductor 110, and an impedance matching structure 111. The first outer conductor 10 is in a cylindrical shape, which includes a closed end 10b and an open end 10a, and a cavity 101 is defined between its closed end 10b and open end 10a. The first inner conductor 110 is disposed in the cavity 101. The impedance matching structure 111 is disposed outside the cavity 101 and is connected to the first inner conductor 110. Further, the microwave heating assembly 1 further includes a microwave feeding unit (not shown), and the microwave feeding unit is connected between the impedance matching structure 111 and the microwave generating unit.

[0039] When the aerosol generating device is in use, the aerosol generating substrate 2 is loaded into the cavity 101. The microwave feeding unit feeds the microwaves generated by the microwave generating unit into the cavity 101 through the first inner conductor 110. The fed microwaves can continuously oscillate in the cavity 101, and the aerosol generating substrate 2 is exposed to the microwave field in the cavity 101 and is heated and atomized by the microwaves to generate an aerosol for the user to inhale.

[0040] Specifically, the microwave feeding unit may include a radio frequency connector (not shown). The radio frequency connector can be connected to the impedance matching structure 111, so that the microwaves generated by the microwave generating unit can be transmitted into the cavity 101 sequentially through the impedance matching structure 111 and the first inner conductor 110. The radio frequency connector can be a standard SMP-JYD radio frequency connector.

[0041] The first outer conductor 10 can be processed from a metallic material or other highly conductive materials. For example, the first outer conductor 10 can include one or more of gold, silver, copper, aluminum, iron, gold-containing alloys, aluminum-containing alloys, copper-containing alloys, iron-containing alloys, stainless steel, etc. Alternatively, the first outer conductor 10 can also include a non-metallic main body and a metallic coating provided on the outer layer of the non-metallic main body.

[0042] Specifically, the first inner conductor 110 is used to form a microwave field, and the impedance matching structure 111 is used to achieve impedance matching between the cavity 101 and the microwave generating unit. It should be noted that the meaning of impedance matching is that the characteristic impedance of the transmission line is equal to the load impedance in magnitude and the same in phase. At this time, the energy on the transmission line is transmitted to the load with almost no reflection. Generally, the impedance matching structure 111 needs to have a sufficient length to achieve impedance matching. Moreover, in the prior art, the inner conductor unit (which has an impedance matching section) and the aerosol generating matrix are usually arranged together in the cavity defined by the outer conductor unit, so that the cavity in the prior art has a relatively large volume. In particular, in the present invention, the impedance matching structure 111 is arranged outside the cavity 101, which is beneficial to reducing the volume of the cavity 101. Through experiments, the volume of the cavity 101 of the present invention can be reduced to 11 mm (length) * 9 mm (width) * 27.5 mm (height) = 2722.5 (mm 3 ), compared with the volume of the cavity defined by the outer conductor unit in the prior art, the volume of the cavity 101 of the present invention is reduced by a lot. After reducing the volume of the cavity 101, it is beneficial to reduce the volume of the first outer conductor 10, thereby beneficial to reducing the volume of the microwave heating assembly 1, and ultimately beneficial to the miniaturization of the aerosol generating device.

[0043] Specifically, as Figure 1 shown in the first embodiment, the impedance matching structure 111 surrounds the first outer conductor 10. Again, as Figure 4 shown in the second embodiment, the impedance matching structure 111 can also be arranged on one side of the first outer conductor 10. According to specific requirements, the relative positional relationship between the impedance matching structure 111 and the first outer conductor 10 can be flexibly set to achieve the purpose of optimizing the spatial layout and minimizing the size of the aerosol generating device to the greatest extent.

[0044] The impedance matching structure 111 is strip-shaped and has a central axis and a cross-section, and the extending direction of its central axis is perpendicular to its cross-section.

[0045] To achieve impedance matching between the cavity 101 and the microwave feeding unit, the impedance matching structure 111 includes at least one inductance enhancement section 1111 and / or at least one capacitance enhancement section 1110 along the extension direction of its central axis. That is, the impedance matching structure 111 may include at least one inductance enhancement section 1111, may include at least one capacitance enhancement section 1110, or may simultaneously have an inductance enhancement section 1111 and a capacitance enhancement section 1110. The inductance enhancement section 1111 and the capacitance enhancement section 1110 may be alternately arranged. For example, one inductance enhancement section 1111 is connected between two adjacent capacitance enhancement sections 1110; or, one capacitance enhancement section 1110 is connected between two adjacent inductance enhancement sections 1111. As Figure 1 shown in the first embodiment, two capacitance enhancement sections 1110 and one inductance enhancement section 1111 are provided. The inductance enhancement section 1111 is connected between the two capacitance enhancement sections 1110. One end of one capacitance enhancement section 1110 away from the inductance enhancement section 1111 is connected to the RF connector of the microwave feeding unit, and the other end of the other capacitance enhancement section 1110 away from the inductance enhancement section 1111 is connected to the first inner conductor 110.

[0046] Both the capacitance enhancement section 1110 and the inductance enhancement section 1111 can be formed by structurally modifying a coaxial cable. Therefore, the impedance matching structure 111 can be a flexible structure to facilitate flexible adjustment of the arrangement of the impedance matching structure 111. However, the impedance matching structure 111 is not limited to being a flexible structure and can also be a rigid structure, such as a metal tubular structure.

[0047] Specifically, as Figure 5 shown, similar to the structure of a coaxial cable, the impedance matching structure 111 may include a second inner conductor 111a, a second outer conductor 111c, and a dielectric layer 111b disposed between the second inner conductor 111a and the second outer conductor 111c, which are coaxially arranged along its cross-sectional direction. As Figure 3 shown, along the axial direction of the impedance matching structure 111, one end of the second inner conductor 111a is conductively connected to an RF connector (not shown); the other end of the second inner conductor 111a is connected to the first inner conductor 110. The second outer conductor 111c is mechanically and / or electrically connected to the first outer conductor 10. The material of the second outer conductor 111c may be set with reference to the first outer conductor 10.

[0048] In particular, the dielectric layer 111b at the inductance enhancement section 1111 is air. That is, the dielectric layer 111b between the second inner conductor 111a and the second outer conductor 111c can be directly removed, and air is used as the dielectric layer 111b, so that the parasitic inductance of the inductance enhancement section 1111 is enhanced in the microwave frequency band. Specifically, according to the basic principles of electromagnetic fields and electromagnetic waves, by removing the dielectric layer 111b between the second inner conductor 111a and the second outer conductor 111c, the capacitance per unit length of this section of the line can be reduced, making the inductance enhancement section 1111 can be used as a higher impedance part and equivalent to a series inductor, thereby enhancing the parasitic inductance of the inductance enhancement section 1111 in the microwave frequency band.

[0049] The outer diameter b of the dielectric layer 111b at the capacitance enhancement section 1110 is greater than the diameter a0 of the second inner conductor 111a and less than the standard outer diameter b0.

[0050] The standard outer diameter b0 can be calculated by Equation (1):

[0051]

[0052] In Equation (1), Z0 is the characteristic impedance of the coaxial cable, with the unit of Ω; is the relative permittivity of the dielectric layer 111b; a0 is the diameter of the second inner conductor 111a. Z0 can adopt the characteristic impedance of the standard coaxial cable, that is, Z0 can take the value of 50 Ω. According to Equation (1), after determining the coaxial cable characteristic impedance Z0, the relative permittivity of the dielectric layer 111b, and the diameter a0 of the second inner conductor 111a, the standard outer diameter b0 can be obtained. And the outer diameter b of the dielectric layer 111b at the capacitance enhancement section 1110 should be less than the standard outer diameter b0 of this dielectric layer 111b, that is, a0 < b < b0. That is, the outer diameter b of the dielectric layer 111b at the capacitance enhancement section 1110 is appropriately reduced on the basis of the standard outer diameter b0 to enhance its parasitic capacitance in the microwave frequency band. Specifically:

[0053] Please refer to Equation (2):

[0054]

[0055] In Equation (2), C is the capacitance, l is the length, which can take the unit length, that is, l = 1; is the relative permittivity of the dielectric layer 111b; b is the outer diameter of the dielectric layer 111b, and a is the diameter of the second inner conductor 111a. It can be seen from Equation (2) that when the outer diameter b of the dielectric layer 111b decreases, the capacitance C will increase accordingly. Therefore, according to the basic principles of electromagnetic fields and electromagnetic waves, after reducing the outer diameter b of the dielectric layer 111b at the capacitance enhancement section 1110, the parasitic capacitance of the capacitance enhancement section 1110 can be enhanced in the microwave frequency band.

[0056] Please refer to together Figure 6 , by setting the capacitance enhancement section 1110 and the inductance enhancement section 1111, the parasitic capacitance and parasitic inductance of the impedance matching structure 111 can be adjusted, so as to achieve impedance matching between the cavity 101 and the microwave feeding unit. At the same time, the impedance matching structure 111 can be arranged outside the cavity 101, thereby reducing the volume of the cavity 101, which is beneficial to the miniaturization of the aerosol generating device.

[0057] Furthermore, along the extending direction of its central axis, the impedance matching structure 111 may further include at least one standard characteristic impedance section 1112. The standard characteristic impedance section 1112 is connected to the inductance enhancement section 1111 and / or the capacitance enhancement section 1110. Specifically, the standard characteristic impedance section 1112 may be only connected to the inductance enhancement section 1111, or only connected to the capacitance enhancement section 1110, or may be respectively connected to the inductance enhancement section 1111 and the capacitance enhancement section 1110.

[0058] Furthermore, as Figure 1 shown, in the first embodiment, one of the standard characteristic impedance sections 1112 includes a first end for connecting to the microwave feeding unit and a second end for connecting to the inductance enhancement section 1111 or the capacitance enhancement section 1110. That is, the standard characteristic impedance section 1112 serves as a transition connection between the inductance enhancement section 1111 (or capacitance enhancement section 1110) and the RF connector of the microwave feeding unit. The standard characteristic impedance section 1112 meets the design of a standard coaxial cable. Specifically, the outer diameter of the dielectric layer 111b of the standard characteristic impedance section 1112 is the standard outer diameter b0 obtained by formula (1), so that the standard characteristic impedance section 1112 can be directly connected to a standard SMP-JYD RF connector. The characteristic impedance of the standard characteristic impedance section 1112 may be 50Ω.

[0059] As Figure 3 and Figure 7 shown, in the first embodiment, the first inner conductor 110 includes a first end 1101 connected to the impedance matching structure 111 and a second end 1102 far from the impedance matching structure 111. The second end 1102 of the first inner conductor 110 is closer to the bottom wall 101a of the cavity 101 than its first end 1101. Specifically, the first end 1101 of the first inner conductor 110 is connected to the second inner conductor 111a of the impedance matching structure 111.

[0060] Specifically, the end of the second end 1102 of the first inner conductor 110 is its terminal end, which is the part with the most concentrated energy and the largest electric field strength on the first inner conductor 110. Therefore, the part of the aerosol - generating substrate 2 corresponding to the second end 1102 of the first inner conductor 110 is a region with a higher temperature and more prone to charring. In addition, in order to reduce the draw resistance and lower the temperature of the aerosol, there is an air - intake channel in the cavity 101. This air - intake channel extends upward from the bottom of the aerosol - generating substrate 2. Under the action of the user's suction, an upward - flowing air current is formed, and this air current is mixed with the aerosol generated after the aerosol - generating substrate 2 is heated and atomized, so as to achieve the purpose of reducing the draw resistance and lowering the temperature of the aerosol. Therefore, setting the second end 1102 of the first inner conductor 110 close to the bottom wall 101a of the cavity 101 can distribute the high - temperature area at the bottom of the aerosol - generating substrate 2. Cooperating with the air current in the air - intake channel, it can promote the heat to disperse from bottom to top, make full use of the heat flow, and thus is conducive to achieving a more uniform thermal - field distribution and reducing the risk of local charring.

[0061] Please refer to Figure 8 and Figure 9 , Figure 8 which shows the reflection - coefficient diagram of the aerosol - generating device according to the first embodiment of the present invention, characterizing that its designed operating frequency can reach 2.45 GHz. Figure 9 which shows the contour map of the electric - field strength distribution of the microwave - heating component according to the first embodiment of the present invention. Among them, the region characterized by the dotted line shows a shape with a larger lower - part area and a smaller upper - part area, indicating that the electric - field strength in the lower part is larger and the electric - field strength in the upper part is smaller, so that the highest - temperature region is located at the bottom of the aerosol - generating substrate 2, and the heat disperses from bottom to top, making the thermal - field distribution more uniform.

[0062] Further, as Figure 7 and Figure 11 shown, the extending trajectory of the first inner conductor 110 from its first end 1101 to its second end 1102 can be a straight line, a curve, or a combination of a straight line and a curve.

[0063] Further, in the first embodiment as Figure 7 shown, the extending trajectory of the first inner conductor 110 from its first end 1101 to its second end 1102 is a straight line. Or, as in the fourth embodiment shown in Figure 11 , at least part of the extending trajectory of the first inner conductor 110 between its first end 1101 and its second end 1102 is a curve. Of course, in other embodiments, the extending trajectory of the first inner conductor 110 between its first end 1101 and its second end 1102 can also be entirely a curve. The part of the extending trajectory of the first inner conductor 110 that is a curve is simply referred to as the curved part. The curved part of the first inner conductor 110 can bring a wider heated area to the aerosol - generating substrate 2.

[0064] Specifically, the cavity 101 includes a first accommodating area adapted to the volume of the aerosol - generating substrate 2 accommodated therein, and a second accommodating area provided on one side of the accommodating area. The first inner conductor 110 is disposed in the second accommodating area. The first accommodating area is the space of the cavity 101 occupied when the aerosol - generating substrate 2 is placed in the cavity 101. That is, the size of the first accommodating area is consistent with the volume of the aerosol - generating substrate 2 loaded into the cavity 101.

[0065] The curved portion of the first inner conductor 110 can be arranged corresponding to the first accommodating area to specifically bring a wider heating area for the aerosol - generating substrate 2. Specifically, the length of the curved portion of the first inner conductor 110 can be equal to the length of the first accommodating area, and the upper end of the curved portion can be flush with the upper end of the first accommodating area, and the lower end of the curved portion can be flush with the upper end of the first accommodating area. In this way, a wider heating area can be more specifically brought for the aerosol - generating substrate 2.

[0066] As Figure 7 、 Figure 10 and Figure 11 shown, the first inner conductor 110 is in a long - strip shape and includes at least two conductor segments 1103. As Figure 7 shown in the first embodiment, the first inner conductor 110 includes two conductor segments 1103, and the two conductor segments 1103 are joined at an angle. That is, the two conductor segments 1103 are joined together, and an angle is formed between the two conductor segments 1103. As Figure 10 shown in the third embodiment, the first inner conductor 110 includes three conductor segments 1103, and the three conductor segments 1103 are joined in sequence, and an angle is formed between adjacent two conductor segments 1103.

[0067] Specifically, as Figure 7 shown in the first embodiment, an angle of 90° is formed between the two conductor segments 1103. In this way, the first inner conductor 110 is generally in an L - shape. The first end 1101 of the first inner conductor 110 is located on one of the conductor segments 1103; the second end 1102 of the first inner conductor 110 is located on the other conductor segment 1103. And, the conductor segment 1103 where the second end 1102 of the first inner conductor 110 is located is below the aerosol - generating substrate 2.

[0068] As Figure 10In the third embodiment shown, a 90° angle is formed between two adjacent conductor segments 1103. Thus, the first inner conductor 110 is generally U-shaped. In this embodiment, the three conductor segments 1103 are respectively a first conductor segment 11031, a second conductor segment 11032, and a third conductor segment 11033 that are connected in sequence. The first end 1101 of the first inner conductor 110 is located on the first conductor segment 11031; the second end 1102 of the first inner conductor 110 is located on the third conductor segment 11033. Moreover, the third conductor segment 11033 is located on the side of the aerosol generating substrate 2. Therefore, the second end 1102 of the first inner conductor 110 is also located on the side of the aerosol generating substrate 2.

[0069] It can be understood that the angle formed between the two conductor segments 1103 is not limited to 90°, and this angle can be greater than 0° and less than or equal to 90 degrees.

[0070] It can be seen that by adjusting the number of conductor segments 1103 and the angle between adjacent conductor segments 1103, the relative position between the end (tip) of the second end 1102 of the first inner conductor 110 and the aerosol generating substrate 2 can be flexibly adjusted to adjust the thermal field distribution around the aerosol generating substrate and reduce the risk of local charring. The first inner conductor 110 can be a long cylindrical body to facilitate the bending of the first inner conductor 110 into multiple conductor segments 1103.

[0071] Furthermore, as Figure 12 shown, in the first embodiment, the microwave heating assembly 1 further includes a fixing seat 13 disposed in the cavity 101. This fixing seat 13 is used to accommodate the aerosol generating substrate 2 to prevent condensate, e-liquid, etc. generated at the aerosol generating substrate 2 from contaminating the inner wall surface of the first outer conductor 10. That is, the aerosol generating substrate 2 is fixed in the cavity 101 through the fixing seat 13. Specifically, the fixing seat 13 and the cavity 101 can be detachably connected, so that it is convenient for the user to take out the fixing seat 13 and facilitate the cleaning or replacement of the fixing seat 13. In addition, after a part of the space is formed between the aerosol generating substrate 2 and the inner wall surface of the fixing seat 13, an air inlet channel can be formed to reduce the suction resistance and lower the temperature of the aerosol. The first fixing seat 13 can be made of polytetrafluoroethylene material. Of course, in other embodiments, the fixing seat 13 and the cavity 101 can also be non-detachably connected. Or, the fixing seat 13 can also be not provided, and the aerosol generating substrate 2 can be directly placed in the cavity 101. The fixing seat 13 can be made of polytetrafluoroethylene, PEEK, quartz, alumina ceramic or composite wave-transparent material.

[0072] As Figure 1 and Figure 3As shown, in the first embodiment, the first accommodating region has a top edge and a bottom edge in the longitudinal direction. Since the first accommodating region is the space of the cavity 101 occupied when the aerosol generating substrate 2 is placed in the cavity 101, the top edge of the first accommodating region can be understood as the top surface of the aerosol generating substrate 2 accommodated therein. In particular, the end surface of the open end 10a of the first outer conductor 10 is higher than the top edge of the first accommodating region. That is, when the aerosol generating substrate 2 is placed in the cavity 101, the end surface of the open end 10a of the first outer conductor 10 is higher than the top surface of the aerosol generating substrate 2. In this way, the part of the first outer conductor 10 that is higher than the first accommodating region (aerosol generating substrate 2) can act as a cutoff waveguide to reduce electromagnetic leakage. Further, as Figure 1 and Figure 3 shown, a through hole 102 is formed in the first outer conductor 10, and the first inner conductor 110 penetrates through the through hole 102 and extends into the cavity 101.

[0073] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present invention patent; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A microwave heating component (1), characterized in that, It includes a first outer conductor (10), a first inner conductor (110), and an impedance matching structure (111); the first outer conductor (10) is cylindrical and includes a closed end (10b) and an open end (10a), and a cavity (101) is defined between the closed end (10b) and the open end (10a); the first inner conductor (110) is disposed in the cavity (101); the impedance matching structure (111) is disposed outside the cavity (101) and is connected to the first inner conductor (110).

2. The microwave heating component (1) according to claim 1, characterized in that, The impedance matching structure (111) surrounds the first outer conductor (10); and / or, the impedance matching structure (111) is a flexible structure.

3. The microwave heating component (1) according to claim 1, characterized in that, The impedance matching structure (111) is strip-shaped and has a central axis. Along the extending direction of the central axis, the impedance matching structure (111) includes at least one inductance enhancement section (1111) and / or at least one capacitance enhancement section (1110).

4. The microwave heating component (1) according to claim 3, characterized in that, The impedance matching structure (111) also has a cross-section perpendicular to the central axis. Along its cross-sectional direction, the impedance matching structure (111) includes a second inner conductor (111a), a second outer conductor (111c) coaxially arranged, and a dielectric layer (111b) disposed between the second inner conductor (111a) and the second outer conductor (111c); The dielectric layer (111b) at the inductance enhancement section (1111) is air; The outer diameter (b) of the dielectric layer (111b) at the capacitance enhancement section (1110) is greater than the diameter (a0) of the second inner conductor (111a) and less than the standard outer diameter (b0).

5. The microwave heating component (1) according to claim 3, characterized in that, The inductance enhancement section (1111) and the capacitance enhancement section (1110) are alternately arranged.

6. The microwave heating component (1) according to claim 3, characterized in that, Along the extending direction of the central axis, the impedance matching structure (111) further includes at least one standard characteristic impedance section (1112); the standard characteristic impedance section (1112) is connected to the inductance enhancement section (1111) and / or the capacitance enhancement section (1110).

7. The microwave heating component (1) according to any one of claims 1 to 5, characterized in that, The first inner conductor (110) includes a first end (1101) connected to the impedance matching structure (111) and a second end (1102) far from the impedance matching structure (111); The second end (1102) of the first inner conductor (110) is closer to the bottom wall (101a) of the cavity (101) than its first end (1101); and / or, The extending trajectory of the first inner conductor (110) from its first end (1101) to its second end (1102) is a straight line, a curve, or a combination of a straight line and a curve.

8. The microwave heating component (1) according to any one of claims 1 to 5, characterized in that, The first inner conductor (110) is strip-shaped and includes at least two conductor segments (1103); When the first inner conductor (110) includes two such conductor segments (1103), the two conductor segments (1103) are joined at an angle; When the first inner conductor (110) includes two or more of the conductor segments (1103), the conductor segments (1103) are connected in sequence, and an included angle is formed between two adjacent conductor segments (1103).

9. The microwave heating component (1) according to any one of claims 1 to 5, characterized in that, The microwave heating assembly (1) further includes a fixing base (13) for accommodating the aerosol generating substrate (2); the fixing base (13) is disposed in the cavity (101).

10. An aerosol generating device, characterized in that, Comprising a microwave generating unit and the microwave heating assembly (1) according to any one of claims 1 to 9, the microwave heating assembly (1) further includes a microwave feeding unit connected between the impedance matching structure (111) and the microwave generating unit, and the microwave feeding unit feeds the microwave generated by the microwave generating unit into the cavity (101).

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