CN114209096A

CN114209096A - Atomizing device and microwave heating assembly

Info

Publication number: CN114209096A
Application number: CN202111660686.3A
Authority: CN
Inventors: 杜靖
Original assignee: Shenzhen Maishi Technology Co Ltd
Current assignee: Shenzhen Maishi Technology Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-03-22

Abstract

The invention relates to an atomization device and a microwave heating assembly, wherein the microwave heating assembly comprises a cavity, a conductor column and a microwave feed-in device; the cavity is cylindrical, the bottom of the cavity is closed, and a feed-in hole is formed in the side wall of the cavity; the conductor column is arranged at the bottom in the cavity and is connected with the bottom of the cavity and conducts electricity; the microwave feed-in device is inserted into the cavity through the feed-in hole and is in contact conduction with the inner wall surface of the cavity and/or the surface of the conductor post so as to feed microwaves into the cavity; a dielectric body is arranged between the outer wall surface of the conductor column and the inner wall surface of the cavity. The microwave heating component can reduce the length of the resonant cavity by filling the high dielectric material in the cavity, realizes the reduction of the volume of the cavity, is beneficial to the miniaturization of the atomization device, puts aerosol forming substrate in the cavity, utilizes microwave to carry out microwave heating on the aerosol forming substrate, reduces the harm of harmful substances in tobacco to smokers, does not generate a high-temperature combustion cracking process, reduces the release amount of tar and harmful substances in the tobacco, and reduces the harm of second-hand smoke.

Description

Atomizing device and microwave heating assembly

Technical Field

The invention relates to the field of atomization, in particular to an atomization device and a microwave heating assembly.

Background

The heating temperature for heating the non-combustible smoking substrate is generally between 250 ℃ and 350 ℃, compared with the common burning cigarette, the heating of the non-combustible smoking substrate can greatly reduce the harm of harmful substances in the tobacco to smokers while keeping the taste of the traditional cigarette, and does not generate the high-temperature burning cracking process, thereby reducing the release amount of tar and the harmful substances in the tobacco, and greatly reducing the harm of second-hand smoke.

The volume of common microwave heating is large, and the common microwave heating is not beneficial to being applied to the field of atomizing devices with requirements on the volume.

Disclosure of Invention

The present invention is directed to an atomizer and a microwave heating assembly, which are provided to overcome the above-mentioned drawbacks of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a microwave heating assembly comprising a cavity, a conductor column and a microwave feed-in device;

the cavity is cylindrical, the bottom of the cavity is closed, and a feed-in hole is formed in the side wall of the cavity;

the conductor column is arranged at the bottom in the cavity and is connected with the bottom of the cavity and is conductive;

the microwave feed-in device is inserted into the cavity through the feed-in hole and is in contact conduction with the inner wall surface of the cavity and/or the surface of the conductor post so as to feed microwaves into the cavity;

and a dielectric body is arranged between the outer wall surface of the conductor column and the inner wall surface of the cavity.

Preferably, the cavity is made of conductive metal.

Preferably, a first conductive layer is coated on an inner wall surface of the cavity.

Preferably, the conductor column is of a hollow or solid structure, and the outer wall is conductive.

Preferably, the conductor pillar is a conductive material.

Preferably, the outer wall surface of the conductor pillar is coated with a second conductive layer.

Preferably, the microwave feeding device is in a straight shape, and one end of the microwave feeding device is in contact conduction with the side wall surface of the conductor pillar.

Preferably, the microwave feeding device is L-shaped, and one end of the microwave feeding device is in contact conduction with the bottom surface of the cavity.

Preferably, the dielectric body is lower than the conductor pillar, or flush with the conductor pillar, or higher than the conductor pillar, and lower than the cavity, or flush with the cavity height, or higher than the cavity.

Preferably, the inner ring of the dielectric body is provided with a positioning part protruding towards the middle part.

Preferably, the positioning part is a rib.

Preferably, the material of the dielectric body includes one or a combination of at least 2 of alumina, corundum, mullite, forsterite, magnesia, zirconia, silica, zircon, boron nitride, aluminum nitride, spodumene, BaTiO3 ceramic having an epsilon of 30 to 40, MgTiO3, CaTiO3 ceramic, SrTiO3, Ba (Zn, Nb) O3, Ba (Sr, Ta) O3, and BaO-Nd2O3-TiO2, BaO-Sm2O3-TiO2 rare earth mixed crystal having an epsilon of 70 to 90.

Preferably, a temperature measuring device for measuring temperature is further arranged in the cavity.

Preferably, the conductor column is provided with a receiving hole in the middle, and the temperature measuring device is inserted in the receiving hole.

Preferably, the temperature measuring device comprises a hollow probe and a temperature measuring component, the temperature measuring component is inserted in the probe, and the outer end of the probe is closed.

Preferably, the temperature measurement assembly comprises a thermocouple or an optical fiber.

Preferably, the probe is in ohmic contact with the conductor pillar.

Preferably, the chamber is further provided with a fixing means for fixing the aerosol-forming substrate, the fixing means being of a material which is permeable to microwaves.

Preferably, the material of the fixing means has a loss tangent of less than 0.1.

Preferably, the fixing device is made of plastic.

An atomizing device comprises the microwave heating assembly.

The implementation of the atomization device and the microwave heating assembly of the invention has the following beneficial effects: the microwave heating component can reduce the length of the resonant cavity by filling the high dielectric material in the cavity, thereby realizing the reduction of the cavity volume, being beneficial to the miniaturization of the atomization device, putting aerosol into the cavity to form a substrate, utilizing microwave to carry out microwave heating on the aerosol forming substrate, greatly reducing the harm of harmful substances in tobacco to smokers, not generating the pyrolysis process of high-temperature combustion, reducing the release amount of tar and harmful substances in tobacco, and greatly reducing the harm of second-hand smoke.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic block diagram of an atomizing device in an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a microwave heating assembly in an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of the microwave heating assembly of FIG. 1;

FIG. 4 is a schematic diagram of a microwave heating cavity;

FIG. 5 is a schematic view of the dielectric body being higher than the conductor post;

FIG. 6 is a schematic view of a dielectric body below a conductor post;

figure 7 is a schematic diagram of a dielectric with a conductor pillar level flush.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1, the atomizing device in a preferred embodiment of the present invention includes a microwave heating assembly 10, a control module 20, a battery module 30, and a microwave generating device 40, wherein the battery module 30 is electrically connected to the control module 20 and the microwave generating device 40 to supply power to the control module 20 and the microwave generating device 40, so that the microwave feeding device 40 generates microwaves, and the control module 20 is configured to control parameters such as microwave power, heating time, start-stop interval, and the like output by the microwave generating device 40.

As shown in connection with fig. 2, an aerosol-forming substrate, a microwave heating assembly 10, comprises a cavity 1, into which a cavity 1 may be inserted an aerosol-forming substrate 7, which may be tobacco or the like, a conductor column 2, and a microwave feedthrough 3. The microwave generating device 40 is connected to the microwave feed-in 3, and the microwave feed-in 3 is disposed between the microwave generating device 40 and the cavity 1, and is used for transmitting the microwaves generated by the microwave generating device 40 into the cavity 1, and heating the aerosol-forming substrate 7 in the cavity 1 by the microwaves.

The cavity 1 is cylindrical, one end of the cavity is closed, and a feed hole 11 is formed in the side wall of the cavity 1. The conductor post 2 is arranged at the bottom in the cavity 1, and the conductor post 2 is connected with the bottom of the cavity 1 and conducts electricity.

The microwave feeding device 3 is inserted into the cavity 1 through the feeding hole 11 and is in contact conduction with the inner wall surface of the cavity 1 and/or the surface of the conductor post 2 to feed microwaves into the cavity 1.

Preferably, in this embodiment, a dielectric 4 is provided between the outer wall surface of the conductor post 2 and the inner wall surface of the cavity 1.

As shown in connection with fig. 4, the resonant cavity operates according to the following λ/4 resonant cavity principle:

the lambda/4 coaxial resonant cavity is formed by a coaxial line with one end short-circuited and one end open-circuited,

the open end of the lambda/4 coaxial resonant cavity is realized by using a section of circular waveguide in a cut-off state, and according to the boundary conditions of two end faces, the cavity length l is equal to lambda₀Odd multiples of/4, i.e. l ═ 2 p-1. lambda.₀]And/4 (p is 1,2,3, …). Thus, the resonance wavelength of the λ/4 coaxial resonator is:

the quality factor of the lambda/4 coaxial line resonant cavity is as follows:

the difference between the lambda/4 coaxial resonant cavity and the lambda/2 coaxial resonant cavity is that the conductor loss of one end face is reduced.

The choice of the transverse dimensions of the λ/2 and λ/4 coaxial resonators is determined by the following conditions:

(1) and in order to ensure that the coaxial resonant cavity works in a TEM mode without high order mode requirements:

π(d+D)/2＜λ_0minnamely: pi (a + b)2 < lambda_0min；

(2) To ensure a higher Q of the resonant cavity for the coaxial line₀The values should be taken as:

2 is less than or equal to (D/D) is less than or equal to 6), namely 2 is less than or equal to (b/a) is less than or equal to 6;

(3) and for the lambda/4 coaxial resonant cavity, the circular waveguide at the open end is also ensured to be in a cut-off state, and the following requirements are met: 1.71D < lambda_0minI.e. 3.41b < lambda_0min。

From the equation for the length of the cavity, l, the minimum size of the λ/4 coaxial cavity is approximately 1/4 for the electromagnetic wavelength. The wavelength of 2.45GHz electromagnetic wave in air is about 12.24cm, and l is about 3.06cm, if l is to be shortened, the wavelength of electromagnetic wave needs to be shortened, and the wavelength of electromagnetic wave in material can be calculated according to the following formula:

for the dielectric material, μ r is typically l, and as ∈ r is larger, the wavelength is shorter, l can also be designed to be shorter, and thus miniaturization of the cavity 1 can be achieved.

The microwave heating component 10 can reduce the length of the resonant cavity by filling the high dielectric material in the cavity 1, thereby realizing the reduction of the volume of the cavity 1, being beneficial to the miniaturization of the atomization device, putting the aerosol forming substrate 7 in the cavity, utilizing the microwave to carry out microwave heating on the aerosol forming substrate 7, greatly reducing the harm of harmful substances in tobacco to smokers, not generating the pyrolysis process of high temperature combustion, thereby reducing the release amount of tar and harmful substances in tobacco, and greatly reducing the harm of second-hand smoke.

In some embodiments, the chamber 1 is made of conductive metal, typically aluminum, copper, gold, silver, stainless steel, etc. In other embodiments, the inner wall surface of the chamber 1 may be coated with a first conductive layer 12, such as gold plating, silver plating, copper plating, etc.

Further, in some embodiments, the conductor column 2 is a hollow or solid structure, and the outer wall is conductive, so as to form microwave radiation in the cavity 1 after the microwave is fed into the cavity 1.

The conductive post 2 is made of a conductive material, and preferably, may be made of a conductive metal material or other high-conductivity material.

In other embodiments, the conductor pillar 2 may also be a non-metal material, and the outer wall surface of the conductor pillar 2 is coated with a second conductive layer 21, and the second conductive layer 21 is a metal-plated thin film layer, such as gold plating, silver plating, copper plating, and the like.

In some embodiments, as shown in fig. 3, the microwave feedthrough 3 is a generally coaxial connector, one end of which is connected to the microwave source and microwave generating device 40, and the other end of which is inserted into the cavity 1 through the feedthrough. Generally, the microwave feeding device 3 may be a straight-line type, and one end inserted into the cavity 1 is in contact with the sidewall surface of the conductive pillar 2.

As shown in fig. 5, in other embodiments, the microwave feeding device 3 may also be L-shaped, and one end inserted into the cavity 1 is in contact with and conducted with the bottom surface of the cavity 1. Alternatively, the shape of the end of the microwave feeding device 3 inserted into the cavity 1 may be other shapes such as an arc shape, and the microwave feeding device may be in contact with the inner wall surface of the cavity 1 or the outer wall surface of the conductor post 2.

In some embodiments, the dielectric 4 is lower than the conductive post 2 as shown in fig. 6, the dielectric 4 can be flush with the conductive post 2 as shown in fig. 7, the dielectric 4 can be higher than the conductive post 2 and lower than the cavity 1 as shown in fig. 3 and 5, and the dielectric 4 can be flush with the cavity 1 or higher than the cavity 1 in other embodiments.

As shown in fig. 3 and 5, when the dielectric body 4 is higher than the conductor column 2 and lower than the cavity 1, or the dielectric body 4 is flush with the cavity 1, or the dielectric body 4 is higher than the cavity 1, the dielectric body 4 also has the function of fixing the aerosol-forming substrate 7, i.e. the inner aperture of the dielectric body 4 is slightly larger than the diameter of the aerosol-forming substrate 7, so that the aerosol-forming substrate 7 is inserted into the inner aperture of the dielectric body 4 for fixing.

Preferably, a positioning portion (not shown) protruding toward the center is provided on the inner periphery of the dielectric body 4, and the aerosol-forming substrate 7 inserted into the dielectric body 4 can be positioned and engaged. The positioning portions are generally ribs and ridges, and can fix the aerosol-forming substrate 7 and form a gas passage between the inner wall surface of the dielectric body 4 and the aerosol-forming substrate 7 to allow the flow of the flue gas.

In other embodiments, as shown in fig. 6 and 7, when the dielectric body 4 is lower than the conductive post 2 or flush with the conductive post 2, and the aerosol-forming substrate 7 is not easily fixed by the dielectric body 4, a fixing device 5 for fixing the aerosol-forming substrate 7 may be further provided in the chamber 1, and the fixing device 5 may be made of a material that can penetrate microwaves to atomize the aerosol-forming substrate 7 with microwaves.

Further, the loss tangent of the material of the fixing device 5 is less than 0.1, and the material of the fixing device 5 is plastic. In particular, it may be peek, i.e. polyetheretherketone.

In some embodiments, the material of the dielectric body 4 may include alumina, corundum, mullite, forsterite, magnesia, zirconia, silica, zircon, boron nitride, aluminum nitride, spodumene, various glass dielectric materials, etc., BaTiO3 ceramic material with an epsilon of 30 to 40, MgTiO3, CaTiO3 ceramic material, SrTiO3, Ba (Zn, Nb) O3, Ba (Sr, Ta) O3, and one or a combination of at least 2 of BaO-Nd2O3-TiO2, BaO-Sm2O3-TiO2 rare earth mixed crystal system with an epsilon of 70 to 90.

Preferably, the material of the dielectric body 4 is alumina or zirconia.

As shown in fig. 3, 5, 6 and 7, in order to more accurately grasp the atomization temperature of the aerosol-forming substrate 7 in the chamber 1 and allow the user to make a timely action adjustment according to the temperature, a temperature measuring device 6 for measuring the temperature of the aerosol-forming substrate inserted into the chamber is further provided in the chamber 1. Preferably, the middle part of the conductor column 2 is provided with an accommodating hole 22, and the temperature measuring device 6 is inserted into the accommodating hole 22 to sense the temperature value at the middle part of the cavity 1.

Further, in this embodiment, the temperature measuring device 6 includes a hollow probe 61 and a temperature measuring component 62, the temperature measuring component 62 is inserted into the probe 61, and the outer end of the probe 61 is closed. Typically, the temperature sensing assembly 62 includes a thermocouple or an optical fiber, preferably a thermocouple.

The central probe allows the use of a thermocouple (ptc/ntc) for temperature measurement, the sheath probe 61 of the temperature measuring device 6 being in ohmic contact with the conductor post 2.

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

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A microwave heating assembly is characterized by comprising a cavity (1), a conductor column (2) and a microwave feed-in device (3);

the cavity (1) is cylindrical, the bottom of the cavity is closed, and a feed-in hole (11) is formed in the side wall of the cavity (1);

the conductor column (2) is arranged at the bottom in the cavity (1), and the conductor column (2) is connected with the bottom of the cavity (1) and conducts electricity;

the microwave feed-in device (3) is inserted into the cavity (1) through the feed-in hole (11) and is in contact conduction with the inner wall surface of the cavity (1) and/or the surface of the conductor post (2) so as to feed microwaves into the cavity (1);

and a dielectric body (4) is arranged between the outer wall surface of the conductor column (2) and the inner wall surface of the cavity (1).

2. Microwave heating assembly according to claim 1, characterized in that the cavity (1) is of an electrically conductive metal material.

3. Microwave heating assembly according to claim 1, characterized in that a first electrically conductive layer (12) is provided coated on the inner wall surface of the cavity (1).

4. Microwave heating assembly according to claim 1, characterized in that the conductor column (2) is of hollow or solid construction and the outer wall is electrically conductive.

5. Microwave heating assembly according to claim 4, characterized in that the conductor column (2) is of an electrically conductive material.

6. Microwave heating assembly according to claim 4, characterized in that the outer wall surface of the conductor column (2) is coated with a second electrically conductive layer (21).

7. Microwave heating element according to claim 1, characterized in that the microwave feedthrough (3) is in the shape of a straight line and has one end in contact with the side wall surface of the conductor pillar (2).

8. Microwave heating assembly according to claim 1, characterized in that the microwave feedthrough (3) is L-shaped with one end in contact with the bottom surface of the cavity (1).

9. A microwave heating assembly according to any of claims 1 to 8, characterized in that the dielectric body (4) is lower than the conductor pillar (2), or flush with the conductor pillar (2), or higher than the conductor pillar (2), and lower than the cavity (1), or level with the cavity (1), or higher than the cavity (1).

10. Microwave heating assembly according to claim 9, characterized in that the inner circumference of the dielectric body (4) is provided with a centrally protruding positioning portion.

11. A microwave heating assembly as in claim 10 wherein the locating portions are ribs and ribs.

12. A microwave heating element according to any of claims 1 to 8, wherein the material of the dielectric body (4) comprises one or a combination of at least 2 of alumina, corundum, mullite, forsterite, magnesia, zirconia, silica, zircon, boron nitride, aluminum nitride, spodumene, BaTiO 3-based porcelain having an ε of 30 to 40, MgTiO3, CaTiO 3-based porcelain, SrTiO3, Ba (Zn, Nb) O3-based, Ba (Sr, Ta) O3-based, and BaO-Nd2O3-TiO2, BaO-Sm2O3-TiO2 rare earth mixed crystal system having an ε of 70 to 90.

13. A microwave heating assembly according to any of claims 1 to 8, characterized in that a temperature measuring device (6) for measuring temperature is further arranged in the cavity (1).

14. Microwave heating assembly according to claim 13, characterized in that a receiving hole (22) is opened in the middle of the conductor column (2), and the temperature measuring device (6) is inserted into the receiving hole (22).

15. Microwave heating assembly according to claim 13, characterized in that the temperature measuring device (6) comprises a hollow probe (61) and a temperature measuring assembly (62), the temperature measuring assembly (62) being inserted in the probe (61), the outer end of the probe (61) being closed.

16. Microwave heating assembly according to claim 15, wherein the thermometric assembly (62) comprises a thermocouple or an optical fiber.

17. Microwave heating assembly according to claim 15, characterized in that the probe (61) is in ohmic contact with the conductor column (2).

18. A microwave heating assembly according to any of claims 1 to 8, characterized in that the chamber (1) is further provided with fixing means (5) for fixing an aerosol-forming substrate (7), the fixing means (5) being made of a material which is permeable to microwaves.

19. A microwave heating assembly according to claim 18, characterized in that the loss tangent of the material of the fixing means (5) is less than 0.1.

20. A microwave heating assembly according to claim 18, characterized in that the fixing means (5) is made of plastic.

21. An atomising device comprising a microwave heating assembly according to any of claims 1 to 20.