Radio frequency heating assembly and aerosol generating device

Abstract

The utility model provides a radio frequency heating assembly and an aerosol generating device. The radio frequency heating assembly is used for the aerosol generating device. Wherein the radio frequency heating assembly comprises a radio frequency radiator with a resonant cavity, the radio frequency radiator is provided with a transmission joint, and the transmission joint is used for receiving a radio frequency signal; the resonant cavity comprises an inner area and a peripheral area surrounding the inner area, the inner area is provided with a containing cavity used for containing a heated medium, and the containing cavity is further provided with an opening communicating the containing cavity to the outside; the peripheral area is provided with at least three dielectric bodies which are evenly distributed, and cavities are formed in the dielectric bodies. The radio frequency heating assembly is provided with the dielectric body, and the dielectric body can provide a capacitance value for the resonant cavity, so that the resonant cavity can still keep a proper resonant frequency when the size of the device is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of radio frequency microwaves, and in particular relates to a radio frequency heating component and an aerosol generating device. Background Art

[0002] An aerosol generating device refers to a device that can form an aerosol from an atomizable medium by heating or ultrasound. Current aerosol generating devices mainly use heat conduction to heat the aerosol generating matrix, which has defects such as long preheating time and uneven heating. Microwave heating is a new heating technology. The general principle is: microwaves are fed from one end and then resonate in the resonator; it has the advantages of fast heating speed and good uniformity. In related technologies, microwave heating devices usually use a 1 / 4 wavelength microwave resonant cavity to send microwave energy into the aerosol matrix through an inner conductor pin; due to the limitation of the λ / 4 wavelength principle, the height of the cavity is generally above 30 mm, which means that the device size is large and it is difficult to meet user needs. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a radio frequency heating component and an aerosol generating device, aiming to solve the problem of large size of the heating device of the aerosol generating device in the related art.

[0004] In order to solve the above technical problems, the utility model is implemented as follows: on the one hand, a radio frequency heating component is provided for an aerosol generating device, the radio frequency heating component includes a radio frequency radiator forming a resonant cavity, the radio frequency radiator is provided with a transmission connector, the transmission connector is used to receive radio frequency signals; the resonant cavity includes an internal area and a peripheral area surrounding the internal area, the internal area is provided with a receiving cavity for accommodating a heated medium, the receiving cavity has an opening connecting the receiving cavity to the outside; the peripheral area is provided with at least three evenly distributed dielectrics, and a cavity is formed in the dielectric.

[0005] Furthermore, the radio frequency radiator includes a first conductor and a second conductor connected to the transmission connector, the second conductor and the first conductor jointly define an inner area and an outer area, a gap is formed between the second conductor and the first conductor, and the gap is located in the resonant cavity.

[0006] Furthermore, the second conductor member includes an inner tube arranged in the resonance cavity, the first conductor member is fixed in the resonance cavity, the first conductor member and the inner tube together form a partition wall separating the internal area and the peripheral area in the resonance cavity, and a gap is formed between the first conductor member and the inner tube.

[0007] Further, the cavity is filled with a filling matrix or air.

[0008] Furthermore, the filling matrix is ​​a metal oxide or an alloy of metal oxides.

[0009] Furthermore, the metal oxide is one of Al2O3, HfO2, ZrO2, La2O3, TiO2, and Ta2O5.

[0010] Furthermore, the dielectric bodies are distributed symmetrically, and / or the dielectric bodies are distributed in a ring shape.

[0011] Furthermore, the heated medium is in the shape of a hollow cylinder, and the dielectric bodies are distributed in a circular ring shape.

[0012] Furthermore, the cross-sectional shape of the cavity in the axial direction is one of a circle, an ellipse, and a polygon.

[0013] Furthermore, a fixing piece is provided on the isolation wall, and the receiving cavity is formed inside the fixing piece.

[0014] Furthermore, the transmission connector is also connected to an antenna structure, and the antenna structure is used to transmit the radio frequency signal received by the transmission connector to the first conductor or the second conductor.

[0015] On the other hand, an aerosol generating device is provided, comprising a power source, a radio frequency source and the radio frequency heating component as described in the first aspect above; wherein the radio frequency source is used to send a radio frequency signal to the radio frequency heating component.

[0016] Compared with the prior art, the radio frequency heating component and aerosol generating device in the utility model have the following beneficial effects: in the resonant cavity, a dielectric body evenly distributed on the periphery of the heated medium is provided, which can provide additional capacitance for the resonant cavity, thereby increasing the capacitance value in the resonant cavity, so that even if the size of the radio frequency heating component is reduced (the inductance is reduced), the resonant frequency of the resonant cavity can still be maintained at a reasonable level. It can be seen that the structure of the radio frequency heating component is set in this way in the present application, while ensuring its excellent working efficiency, the overall size of the radio frequency heating component and the aerosol generating device can be made smaller, which is conducive to improving the refinement of the device and can better meet people's diverse aesthetic needs and carrying needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the radio frequency heating assembly in the embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the radio frequency heating component in the embodiment of the utility model from a top view.

[0019] In the accompanying drawings, each figure mark represents: 1. RF radiator; 11. first conductor; 12. second conductor; 121. inner tube; 13. resonant cavity; 131. receiving cavity; 14. gap; 15. fixing part; 2. dielectric body; 21. filling matrix; 3. transmission joint; 31. antenna structure; 4. adjustment component; 5. heated medium. DETAILED DESCRIPTION

[0020] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] In the related art, the resonance condition of the radio frequency heating atomization device is usually:

[0024]

[0025] Among them, λ r is the resonant wavelength, l is the length of the inner conductor, and p is a positive integer. When the RF heating atomization device uses a 2.45GHz resonant cavity, the maximum physical length of the inner conductor can be calculated to be 30mm. However, in order to reduce the radiation loss at the open end, the outer conductor should be extended to form a quasi-circular waveguide cutoff section, and the TM02 To TM 01 The cutoff wavelength of the mode is: b~6.2b (b is the distance from the outer wall of the inner conductor to the inner wall of the outer conductor in the cavity, usually 3~5mm), so the cutoff wavelength of the circular waveguide at 2.45GHz is calculated to be: 3~13.05mm. It can be seen that the total length of the device needs to be 33~43.05mm, which is large in size, and the sophistication and portability are difficult to meet people's requirements.

[0026] In order to solve the above-mentioned problems in the related art, the embodiments of the present application provide a radio frequency heating component and an aerosol generating device.

[0027] Example:

[0028] like Figure 1 and 2 As shown, in this embodiment, the RF heating component is used in an aerosol generating device, and the RF heating component includes a RF radiator 1 with a resonant cavity 13 formed therein, and a transmission connector 3 is arranged on the RF radiator 1, and the transmission connector 3 is used to receive a RF signal; the resonant cavity 13 includes an inner area and a peripheral area surrounding the inner area, and the inner area is provided with a receiving cavity 131 for accommodating a heated medium 5, and the receiving cavity 131 has an opening connecting the receiving cavity 131 to the outside; and the peripheral area is provided with at least three evenly distributed dielectric bodies 2, and a cavity is formed in the dielectric body 2.

[0029] Specifically, the dielectric 2 can be a cylindrical component made of a high dielectric material, which can provide additional capacitance for the resonant cavity 13. Due to the presence of the dielectric 2, when the device size is appropriately reduced (the length of the resonant cavity 13 is reduced), the resonant cavity 13 can still maintain a suitable resonant frequency during operation. Compared with the design of a traditional resonant cavity 13 with one end open, the RF heating component of this embodiment can better constrain the electromagnetic energy within the required heating range, and can also make the size of the resonant cavity 13 smaller. In the specific implementation process, by adjusting the capacitance value in the above manner, the length of the resonant cavity can be controlled within 2 to 10 mm, and the device is exquisite and compact, so as to better meet the diverse aesthetic needs and carrying needs of users.

[0030] In this embodiment, the RF radiator 1 includes a first conductor 11 and a second conductor 12 connected to the transmission connector 3. The second conductor 12 and the first conductor 11 jointly define an internal area and a peripheral area. A gap 14 is formed between the second conductor 12 and the first conductor 11, and the gap 14 is located in the resonant cavity 13.

[0031] In some embodiments, one of the first conductor 11 and the second conductor 12 can be a radiator and the other can be a zero potential reference. Figure 1As shown, in a specific embodiment, the first conductor 11 is a zero potential reference member, and the second conductor 12 is a radiator. The gap 14 formed between the first conductor 11 and the second conductor 12 can concentrate the electromagnetic field distribution, and the gap 14 is arranged inside the resonant cavity 13, so that the generated high-frequency electromagnetic field can be completely confined in the resonant cavity 13 and coupled with the heated medium 5, which greatly improves the heating efficiency. In this embodiment, in this embodiment, the dielectric 2 and the gap 14 can provide additional capacitance value for the resonant cavity 13. The resonant frequency formula of the resonant cavity 13 is expressed as:

[0032]

[0033] Among them, f r represents the resonant frequency; L' represents the inductance, which is related to the size of the resonant cavity 13; C1 represents the capacitance value provided by the gap 14 to the resonant cavity 13; C2 represents the sum of the capacitance values ​​provided by each dielectric body 2 to the resonant cavity. It can be seen that the existence of each dielectric body 2 and the gap 14 increases the capacitance value in the resonant cavity 13, and even if the size of the resonant cavity is reduced, the resonant frequency of the resonant cavity 13 can still be maintained at a reasonable level.

[0034] Furthermore, in this embodiment, the second conductor 12 includes an inner tube 121 arranged in the resonance cavity 13, the first conductor 11 is fixed in the resonance cavity 13, the first conductor 11 and the inner tube 121 together form a partition wall separating the internal area and the peripheral area in the resonance cavity 13, and the gap 14 is formed between the first conductor 11 and the inner tube 121.

[0035] Specifically, the radiator (second conductor 12) includes an outer tube, a connecting ring connected to the top of the outer tube and extending inward, and an inner tube 121 extending from the inner edge of the connecting ring to the bottom. The inner tube 121 and the first conductor 11 are spaced and facing each other in the resonant cavity 13, thereby forming a gap 14; so that the first conductor 11 and the second conductor 12 can be enclosed to form a resonant cavity 13 with two chambers, that is, an inner cavity (accommodating cavity 131) corresponding to the internal area and an outer cavity corresponding to the peripheral area are formed, and the outer cavity can be provided with a dielectric 2, so that the capacitance value of the resonant cavity 13 can be increased. A structure similar to a capacitor is formed between the first conductor 11 and the inner tube 121, which can generate a high-frequency electromagnetic field in the resonant cavity 13 to achieve heating of the heated medium 5.

[0036] In this embodiment, the RF radiator 1 can be a metal shell component, and the resonant cavity 13 is a metal cavity enclosed by the metal shell component. The metal shell can be made of a metal element such as copper, aluminum, or other high-conductivity materials. The transmission connector 3 is also connected to an antenna structure 31, and the antenna structure 31 is used to transmit the RF signal received by the transmission connector 3 to the first conductor 11 or the second conductor 12, that is, to transmit the RF signal to the radiator. The transmission connector 3 can be an SMA connector, which is used to connect the RF source and the antenna structure 31 so that the high-frequency electromagnetic energy emitted by the RF source reaches the second conductor 12. The antenna structure 31 can connect the electromagnetic energy to the second conductor 12 with an impedance matching of 50Ohm, so that a signal loop can be formed between the transmission interface, the antenna structure 31, the second conductor 12, and the first conductor 11, and an electric field distribution is generated in the resonant cavity 13, so that the heated medium is heated and an aerosol is generated. That is, when working, the RF source inputs a high-power RF band electromagnetic wave signal to the antenna structure 31 through the SMA connector; the antenna structure 31 is coupled with the second conductor 12, and then an electromagnetic field distribution is generated in the heated medium 5 in the resonant cavity 13 (at this time, the fully enclosed shell structure formed by the second conductor 12 can confine the high-frequency electromagnetic field to the target heating area in the resonant cavity 13), so that the high-frequency electromagnetic field can cause the heated medium 5 to quickly generate heat and produce aerosol within 0.5 to 1 second based on the dielectric heating principle, with fast heat generation and high heating efficiency.

[0037] In this embodiment, the cavity is filled with a filling matrix 21 or air. That is, the cavity can be a dielectric cavity, and only air is retained inside. Even if the size of the resonant cavity 13 is reduced to a certain extent, the resonant cavity 13 can still maintain a suitable resonant frequency during operation. The filling matrix 21 can be a high dielectric material, or a material with a high specific heat capacity and a high dielectric constant. It is understandable that in the actual implementation process, whether to add the filling matrix 21 and how much filling medium to add can be determined based on factors such as the system RF signal size and the simulation situation, and no limitation is made here.

[0038] Further, in the present embodiment, the filling matrix 21 is a metal oxide or an alloy of metal oxides. Metal oxides have a high dielectric constant, so that the capacitance of the dielectric 2 is improved. Such an arrangement can make the volume of the radio frequency heating component smaller while ensuring the excellent heating performance of the radio frequency heating component. Further, the metal oxide can be one of Al2O3, HfO2, ZrO2, La2O3, TiO2, and Ta2O5. Of course, in some specific embodiments, the metal oxide filled in each cavity can also be any combination of two or more of Al2O3, HfO2, ZrO2, La2O3, TiO2, and Ta2O5, which is not limited here. The cross-sectional shape of the cavity in the axial direction is one of circular, elliptical, and polygonal, preferably circular, that is, the dielectric 2 is cylindrical. Of course, in some embodiments, the cross-sectional shape of the cavity in the axial direction can also be a triangle, a quadrilateral, etc., which is not limited here.

[0039] The heated medium 5 in this embodiment can be a cylinder or a hollow cylinder, with a simple overall structure and easy insertion. The shape of the heated medium 5 is preferably a hollow cylinder, and a dielectric material can be arranged inside the hollow cylinder. At the same time, the heated medium 5 also exists as a matrix for aerosol generation, and can achieve self-heating and generate aerosol in the electromagnetic field. Specifically, the heated medium 5, as a load of the radio frequency aerosol generating device, can form an overall system with the coupled metal cavity, so that the resonant cavity 13 has a suitable resonant frequency and generates aerosols quickly and evenly. Furthermore, corresponding to the shape of the heated medium 5, each dielectric 2 can be symmetrically distributed, and / or each dielectric 2 is distributed in a ring shape. It is conducive to forming the required electric field in the resonant cavity 13. In this embodiment, the heated medium 5 is a hollow cylindrical shape, and correspondingly, each dielectric 2 is distributed in a circular ring shape.

[0040] In this embodiment, a fixing member 15 is also provided on the isolation wall, and the receiving cavity 131 is formed on the inner side of the fixing member 15. Specifically, a limiting groove is provided on the inner side of the isolation wall, and the fixing member 15 is embedded in the limiting groove, and the receiving groove is formed by the isolation wall and the positioning member 3. The fixing member 15, the first conductor member 11, and the inner cylinder 121 are coaxially arranged, and the limiting groove includes grooves respectively provided on the first conductor member 11 and the inner cylinder 121. One end of the fixing member 15 is fixed with the groove on the first conductor member 11, and the other end is fixed with the groove on the inner cylinder 121. The existence of the fixing member 15 can stabilize the heated medium 5, and at the same time ensure the stable heat transfer in the resonant cavity 13 during the heating process, thereby ensuring the stability of the resonant frequency. The fixing member 15 can be made of high temperature resistant and low dielectric loss materials such as ceramics, PEEK, PI, PTFE, and quartz glass, or can be made of dielectric substrate materials such as Rogers4350 and FR-4 to provide additional capacitance, further reducing the physical size of the radio frequency heating component.

[0041] In this embodiment, the aerosol generating device includes a power supply, a radio frequency source, and a radio frequency heating component; wherein the power supply can supply power to the aerosol generating device; the radio frequency source can generate a stable output, radio frequency band electromagnetic wave high-power signal (that is, the above-mentioned radio frequency signal) through the DC signal of the power supply, and send the radio frequency signal to the radio frequency heating component. When working, the power supply and the radio frequency source are connected and conductive, and the basic power and DC signal generated by the power supply are converted by the radio frequency source into a high-power radio frequency band electromagnetic wave signal; then the high-power radio frequency band electromagnetic wave signal is input into the antenna structure 31; the antenna structure 31 is coupled with the metal cavity (the coupling effect is determined by the final electric field distribution and return loss), and an electromagnetic field distribution is generated in the heated medium 5. The high-frequency electromagnetic field causes the heated medium 5 to self-generate heat and generate aerosol within 0.5 to 1 second based on the dielectric heating principle.

[0042] In some specific embodiments, the radio frequency heating component can also be provided with a temperature sensor and an adjustment component 4. The adjustment component 4 can make the heated medium 5 and the receiving cavity 131 move relative to each other. After one heating (time is about 0.3 to 1.5 seconds), the temperature of the aerosol generating device is collected by the temperature sensor. When the temperature value of the aerosol generating device reaches the temperature threshold (for example, 25°C to 50°C), the adjustment component 4 can be controlled to move the heated medium 5, so that the heating area of ​​the heated medium 5 is changed from the current heating section to the section to be heated adjacent to the current heating section, and then the section to be heated can be heated, thereby achieving uniform segmented heating and high heating efficiency. It can be understood that in some specific embodiments, a plurality of heating sections can be divided along the axial direction of the heated medium, such as two, three, four, five, etc., which are not limited here; each time, one of the heating sections is concentratedly heated, and the heating effect is good.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A radio frequency heating assembly for an aerosol generating device, characterized in that: It includes a radio frequency radiator with a resonant cavity, the radio frequency radiator is provided with a transmission connector, and the transmission connector is used to receive radio frequency signals; the resonant cavity includes an inner area and a peripheral area surrounding the inner area, the inner area is provided with a receiving cavity for receiving a heated medium, and the receiving cavity has an opening connected to the outside; the peripheral area is provided with at least three evenly distributed dielectrics, and a cavity is formed in the dielectric.

2. The radio frequency heating assembly according to claim 1, characterized in that: The radio frequency radiator includes a first conductor and a second conductor connected to the transmission connector, the second conductor and the first conductor jointly define the inner area and the outer area, a gap is formed between the second conductor and the first conductor, and the gap is located in the resonant cavity.

3. The radio frequency heating assembly according to claim 2, characterized in that: The second conductor member includes an inner cylinder arranged in the resonance cavity, the first conductor member is fixed in the resonance cavity, the first conductor member and the inner cylinder together form a partition wall separating the inner area from the outer area in the resonance cavity, and the gap is formed between the first conductor member and the inner cylinder.

4. The radio frequency heating assembly according to claim 1, characterized in that: The cavity is filled with a filling matrix or air.

5. The radio frequency heating assembly according to claim 4, characterized in that: The filling matrix is ​​a metal oxide or an alloy of metal oxides.

6. The radio frequency heating assembly according to claim 5, characterized in that: The metal oxide is one of Al2O3, HfO2, ZrO2, La2O3, TiO2, and Ta2O5.

7. The radio frequency heating assembly according to claim 1, characterized in that: The dielectric bodies are symmetrically distributed, and / or the dielectric bodies are distributed in a ring shape.

8. The radio frequency heating assembly according to claim 7, characterized in that: The heated medium is in the shape of a hollow cylinder, and the dielectric bodies are distributed in a circular ring shape.

9. The radio frequency heating assembly according to claim 1, characterized in that: The cross-sectional shape of the cavity in the axial direction is one of a circle, an ellipse and a polygon.

10. The radio frequency heating assembly according to claim 3, characterized in that: A fixing piece is also arranged on the isolation wall, and the receiving cavity is formed inside the fixing piece.

11. The radio frequency heating assembly according to claim 2, characterized in that: The transmission connector is also connected to an antenna structure, and the antenna structure is used to transmit the radio frequency signal received by the transmission connector to the first conductor or the second conductor.

12. An aerosol generating device, characterized in that: It comprises a power supply, a radio frequency source, and a radio frequency heating component as described in any one of claims 1 to 11, wherein the radio frequency source is used to send a radio frequency signal to the radio frequency heating component.

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