CN118120971A

CN118120971A - Gas mist generating device and heater for gas mist generating device

Info

Publication number: CN118120971A
Application number: CN202211531384.0A
Authority: CN
Inventors: 张淑媛; 徐中立; 李永海
Original assignee: Shenzhen FirstUnion Technology Co Ltd
Current assignee: Shenzhen FirstUnion Technology Co Ltd
Priority date: 2022-12-01
Filing date: 2022-12-01
Publication date: 2024-06-04
Also published as: WO2024114367A1

Abstract

The application provides an aerosol-generating device and a heater for the aerosol-generating device; wherein the aerosol-generating device comprises: a heater for insertion into the aerosol-generating article for heating; the heater includes: a housing including a free front end and a distal end facing away from each other in a length direction, and a cavity extending between the free front end and the distal end; a porous matrix extending within the cavity; a heating coil positioned within the cavity and disposed at least partially around the porous matrix. The above aerosol-generating device, the heating coil of the heater being arranged around the porous substrate, is advantageous in terms of increasing the length of the high temperature region of the heater and reducing power consumption.

Description

Gas mist generating device and heater for gas mist generating device

Technical Field

The embodiment of the application relates to the technical field of heating non-combustion gas mist generation, in particular to a gas mist generation device and a heater for the same.

Background

Smoking articles (e.g., cigarettes, cigars, etc.) burn tobacco during use to produce tobacco smoke. Attempts have been made to replace these tobacco-burning products by making products that release the compounds without burning.

An example of such a product is a heating device that releases a compound by heating rather than burning a material. For example, the material may be tobacco or other non-tobacco products that may or may not contain nicotine. In known technology, CN202010054217.6 patent application proposes heating tobacco products with a heater that encapsulates a helical heating wire inside an outer sleeve to generate aerosols.

Disclosure of Invention

One embodiment of the application provides an aerosol-generating device configured to heat an aerosol-generating article to generate an aerosol; comprising the following steps: a heater for insertion into the aerosol-generating article for heating; the heater includes:

a housing including free front and rear ends facing away from each other in a length direction, and a cavity extending between the free front and rear ends;

A porous matrix extending within the cavity;

A heating coil is positioned within the cavity and disposed at least partially around the porous matrix.

In some implementations, the porous matrix has an apparent density of between 1g/cm ³～3g/cm³.

In some implementations, the material of the porous matrix has a thermal conductivity of 1-25W/m.k.

In some implementations, the porous matrix has a porosity of between 30 and 80%.

In some implementations, the micropores in the porous matrix have a pore size of 10 to 2000 μm.

In some implementations, the porous matrix includes porous ceramic and/or porous glass.

In some implementations, the porous matrix does not include an elemental substance of the metal.

In some implementations, the heating coil includes, in an axial direction thereof, a first end proximate the free front end, and a second end proximate the end;

the heater further includes: a first conductive pin and a second conductive pin for powering the heating coil; wherein,

The first conductive pin is connected with the first end and extends at least partially from the first end to the outside of the tail end; the second conductive pin is connected to the second end and extends at least partially from the second end to outside the terminal.

In some implementations, the porous matrix is tubular and defines through-holes extending longitudinally therethrough;

The first conductive pin is at least partially located within the via.

In some implementations, the porous matrix has a wall thickness greater than 0.2mm.

In some implementations, the heater further comprises:

a filler located within the cavity of the housing and at least partially filled between the heating coil and the housing; the coefficient of thermal expansion of the filler is not less than 8 ppm/. Degree.C.

In some implementations, the filler includes at least one of glass powder, barium oxide powder, silicon dioxide powder, boron oxide powder, aluminum oxide powder, or magnesium oxide powder.

In some implementations, the heating coil is capable of generating heat due to resistive joule heat when a direct current flows therethrough; the heating coil and the housing are thermally conductive to each other such that the housing is capable of heating by receiving heat from the heating coil to heat the aerosol-generating article.

In some implementations, the heating coil is arranged to generate a varying magnetic field when an alternating current is flowing through it;

the housing is configured to be penetrable by a varying magnetic field to generate heat to heat the aerosol-generating article.

Yet another embodiment of the present application also proposes a heater for an aerosol-generating device, comprising:

A housing configured as a pin or needle and including free front and rear ends facing away from each other in a length direction, and a cavity extending between the free front and rear ends;

A porous matrix extending within the cavity;

The above aerosol-generating device, the heating coil of the heater being arranged around the porous substrate, is advantageous in terms of increasing the length of the high temperature region of the heater and reducing power consumption.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

FIG. 1 is a schematic diagram of an aerosol-generating device according to an embodiment;

FIG. 2 is a schematic diagram of one embodiment of the heater of FIG. 1;

FIG. 3 is an exploded view of the heater of FIG. 2 from one perspective;

FIG. 4 is a cross-sectional electron microscope view of a heater prepared in one embodiment;

FIG. 5 is an electron microscope scan of a cross section of a substrate in one embodiment;

FIG. 6 is a graph of temperature field test results for a heater during heating in one embodiment;

FIG. 7 is a length comparison chart of the high temperature region when the heaters in the examples and comparative examples are heated;

Fig. 8 is a schematic view of a heating profile for heating an aerosol-generating article according to a predetermined time in one embodiment;

FIG. 9 is a graph showing the comparison of the power consumption when the heater is heated according to a predetermined curve in the idle state of the heater in the examples and the comparative examples;

fig. 10 is the result of the temperature test at the case surface B1 in the examples and comparative examples.

Detailed Description

In order that the application may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

An embodiment of the present application proposes an aerosol-generating device, which may be constructed as shown in fig. 1, comprising:

a chamber having an opening 40; in use, the aerosol-generating article 1000 can be removably received within or removed from the chamber through the opening 40 of the chamber;

A heater 30 extending at least partially within the chamber, inserted into the aerosol-generating article 1000 when the aerosol-generating article 1000 is received within the chamber, for heating, such that the aerosol-generating article 1000 releases a plurality of volatile compounds, and such volatile compounds are formed by a heat treatment alone;

A battery cell 10 for supplying power;

a circuit 20 for conducting current between the cell 10 and the heater 30.

In a preferred embodiment, the heater 30 is generally in the shape of a pin or rod or column or sheet or plate, which is further advantageous for insertion into the aerosol-generating article 1000; meanwhile, the heater 30 may have a length of about 12 to 20mm and an outer diameter size of about 2 to 4 mm.

Further in an alternative implementation, the aerosol-generating article 1000 preferably employs tobacco-containing materials that release volatile compounds from a matrix upon heating; or may be a non-tobacco material capable of being heated and thereafter adapted for electrical heating for smoking. The aerosol-generating article 1000 preferably employs a solid matrix, which may comprise one or more of powders, granules, shredded strips, ribbons or flakes of one or more of vanilla leaves, tobacco leaves, homogenized tobacco, expanded tobacco; or the solid substrate may contain additional volatile flavour compounds, whether tobacco or not, to be released when the substrate is heated.

And in some implementations, when the aerosol-generating article 1000 portion is heated inside the aerosol-generating device, the aerosol-generating article 1000 portion is exposed outside the aerosol-generating device, e.g., the filter mouthpiece is located outside the aerosol-generating device, for user-aspiration to be facilitated.

In practice, heater 30 may generally include a resistive heating element, an auxiliary substrate to assist in resistive heating element fixation preparation, and the like. For example, in some implementations, the resistive heating element is in the shape or form of a helical coil. Or in yet other implementations, the resistive heating element is in the form of a conductive trace bonded to the substrate. Or in yet other implementations the resistive heating element is in the shape of a sheet.

Further figures 2-4 show schematic views of a heater 30 of one embodiment; the heater 30 of this embodiment includes a free front end 311 and a rear end 312 that are opposed in the length direction; wherein the free front end 311 is tapered tip for insertion into the aerosol-generating article 1000; specifically, the heater 30 includes:

A housing 31 configured in the shape of a pin or a needle or a column or a bar; and the opposite ends of the housing 31 in the length direction define a free front end 311 and a distal end 312, respectively, which form the heater 30; and, a cavity extending between free front end 311 and distal end 312 is provided within housing 31. Wherein the cavity forms an opening or mouth at end 312 to facilitate assembly of the functional components therein.

In this embodiment, the housing 31 is provided with:

A porous substrate 313 configured to extend in a length direction of the housing 31; the porous substrate 313 can be configured to be tubular in a specific shape; and, the porous substrate 313 is made of an insulating material, such as ceramic, glass, or the like.

A heating coil 32 surrounding and bonded to the porous substrate 313; and is supported by the porous substrate 313 so as to be stably held in the cavity of the housing 31.

In some implementations, the housing 31 has a length of 12-20 mm; the housing 31 has an outer diameter of about 2.0 to 2.8mm and a wall thickness of about 0.1 to 0.3 mm; the inner diameter of the cavity of the housing 31 is about 1.5 to 2.1mm and the length of the cavity is about 12 to 18mm. And in some implementations, the housing 31 is made of stainless steel, such as 340 grade or 304 grade stainless steel, or the like. Or in yet other variations, the housing 31 may also comprise ceramic or the like.

As further shown in fig. 2 to 3, the heating coil 32 is configured in the form of a spiral heating wire or a helical coil extending along a part of the axial direction of the housing 31.

In the implementation shown in fig. 2, the heating coil 32 is fully assembled and held within the cavity of the housing 31, and the heating coil 32 and the housing 31 are thermally conductive to each other after assembly.

And in practice, the heating coil 32 is a resistive heating coil that generates heat by resistive joule heat when a direct current flows through the heating coil 32. In an alternative implementation, the heating coil 32 is fabricated from a metallic material, a metallic alloy, graphite, carbon, a conductive ceramic, or a cermet composite having suitable resistance. Suitable metals or alloy materials include at least one of nickel, cobalt, zirconium, titanium, nickel alloys, cobalt alloys, zirconium alloys, titanium alloys, nichrome, nickel-iron alloys, iron-chromium-aluminum alloys, iron-manganese-aluminum alloys, or stainless steel, among others.

In an embodiment, the housing 31 is made of a thermally conductive metal or alloy material, such as stainless steel. And, the heating coil 32 is insulated from the inner surface of the cavity of the housing 31. And in this implementation, the housing 31 is capable of heating the aerosol-generating article 1000 by receiving the resistive joule heat of the heating coil 32.

Alternatively, in still other variations, the heating coil 32 can be provided with an alternating current by the circuit 20, thereby causing the heating coil 32 to generate a varying magnetic field when the alternating current flows. And, the outer shell 31 is made of a sensitive material, such as 430 grade stainless steel, nickel-iron alloy, etc., so that the outer shell 31 can be penetrated by a varying magnetic field to induce heat generation, thereby heating the aerosol-generating article 1000.

According to the embodiment shown in fig. 3 and 4, the cross-sectional shape of the wire material of the heating coil 32 configured in the form of a solenoid coil is a wide or flat shape other than a conventional circular shape. In the preferred embodiment shown in fig. 2, the wire material of the heating coil 32 has a cross-section with a dimension extending in the longitudinal direction that is greater than a dimension extending in the radial direction perpendicular to the longitudinal direction, so that the wire material of the heating coil 32 has a flat rectangular shape in cross-section. Briefly, the heating coil 32 of the above construction is in the form of a wire material that is completely or at least flattened in comparison to a conventional helical heating coil formed from a circular cross-section wire. Thus, the wire material extends in the radial direction to a lesser extent. By this measure, the energy loss in the heating coil 32 can be reduced. In particular, the transfer of heat generated by the heating coil 32 in the radial direction toward the housing 31 can be promoted.

In other alternative implementations, the heating coil 32 may also be formed from conventional wire material having a circular cross-section.

And in the above implementation, the helical heating coil 32 has about 6 to 18 turns and a length of about 8 to 15 mm. And, the outer diameter of the heating coil 32 is not more than 1.9mm at maximum, for example, the outer diameter of the heating coil 32 may be 1.6 to 1.9mm.

And in some implementations, the spacing between adjacent turns of the heater coil 32 is constant; for example, in some implementations, the spacing between adjacent turns of the heater coil 32 is in the range of 0.025-0.3 mm; for example, in some implementations, the spacing between adjacent turns of the heater coil 32 is in the range of 0.05-0.15 mm.

With further reference to fig. 2 and 3, the heater 30 further includes:

A first conductive pin 321 and a second conductive pin 322 for powering the heating coil 32. On the electrical connection, first and second ends of the heating coil 32 configured as a solenoid coil are connected to the first and second conductive pins 321 and 322, respectively, in the axial direction to form conduction. The heating coil 32 is connected to the first conductive pin 321 near the first end of the free front end 311 by soldering or the like to form conduction. A second end of the heating coil 32 near the tip 312 is directly connected to the second conductive pin 322 by soldering or the like to form conduction.

Further in some implementations, the first conductive pin 321 and the second conductive pin 322 are elongated wires. The first conductive pin 321 and the second conductive pin 322 are made of a metal wire having low resistivity, such as nickel wire, silver-plated nickel wire, copper wire, nickel-plated copper wire, or the like. And after assembly, the first conductive pin 321 and the second conductive pin 322 are each connected to the circuit 20 for conducting current over the heating coil 32.

And the porous substrate 313 has through holes 314 penetrating in the longitudinal direction; after assembly, the first conductive pin 321 is a through hole 314 that extends through or passes through the porous substrate 313; the first conductive pin 321 extends from the heating coil 32 near the first end of the free front end 311, through the through hole 314 of the porous substrate 313, and then extends to the outside of the tail end 312. And, the first conductive pin 321 and/or the second conductive pin 322 have a diameter of about 0.2-0.45 mm; for example, in one particular implementation, the first conductive pin 321 and/or the second conductive pin 322 have a diameter of 0.25 mm.

Further in the above implementation, the porous substrate 313 has a length of about 8-15 mm and an outer diameter of about 1.0-1.5 mm. And, the through-holes 314 of the porous substrate 313 have a diameter of about 0.5 mm. The tubular porous substrate 313 has a wall thickness of greater than 0.2mm; for example, in a specific implementation, a wall thickness of 0.5mm for the tubular porous substrate 313 is advantageous for maintaining the strength of the porous substrate 313.

And in practice, the porous substrate 313 is substantially the same length as the heating coil 32. And in practice, a spacing is maintained between the second end of the heating coil 32 and the tip 312; for example, the second end of the heating coil 32 is spaced from the tip 312 by a distance of about 3-8 mm. And, porous substrate 313 and tip 312 also have a spacing therebetween of about 3-8 mm.

And further referring to fig. 2-4, the heater 30 further includes:

Flange 34, comprising a heat resistant ceramic, an organic polymer such as PEEK, or the like; a flange 34 surrounds or is bonded to the housing 31 and is disposed proximate the end 31. Further in practice, the aerosol-generating device enables stable installation or assembly of the heater 30 by clamping or securing the flange 34. And in some implementations, flange 34 is molded from the above materials around housing 31.

And in the implementation shown in fig. 2, flange 34 is clear of heating coil 32; and in some implementations, the flange 34 is maintained at a spacing of at least 1mm from the front of the heating coil 32. Or flange 34 is positioned between heating coil 32 and end 312. And, a flange 34 surrounding the ring shape of the housing 31; and flange 34 has a thickness of about 2-5 mm.

And in practice, porous matrix 313 comprises a porous body material; for example, in some implementations, the tubular porous substrate 313 includes porous glass, porous ceramics such as porous alumina ceramics, porous zirconia ceramics, and the like. And, the tubular porous substrate 313 does not include an element of metal; or porous substrate 313 does not include an alloy.

And in practice, porous matrix 313 has a porosity of about 30-80%. Or in some implementations, the porous matrix 313 has a porosity of about 50-70%. Or in a particular embodiment, porous substrate 313 has a porosity of 65%.

And in practice, the pore size of the micropores in the porous substrate 313 is 10 to 2000 μm. Or in still other implementations, the pores in porous matrix 313 have a pore size of 200-800 μm. And in practice, as shown in FIG. 5, the average pore size of the micropores in porous substrate 313 is 500 to 1000 μm. Or in still other implementations, the pores of the porous body material of the porous substrate 313 have a pore size of 20-500 μm; and in practice, the average pore size of the micropores in porous matrix 313 is between 20 and 100 μm. Or in still other embodiments, the average pore size of the micropores in porous matrix 313 is between 30 and 80 μm.

And in some implementations, the porous matrix 313 is formed by mixing ceramic raw materials, pore formers, and other material components with organic aids to form a moldable slurry, and then injection molding the moldable slurry in a mold to form a tubular green body and sintering the tubular green body. During sintering, the pore-forming agent decomposes or volatilizes thereby defining the interior microporous pores that form the tubular porous matrix 313.

Alternatively, in some implementations, porous matrix 313 is formed by mixing a precursor comprising a decomposable ceramic material with an organic promoter, molding to form a green body, and then sintering. During sintering, the decomposable ceramic material precursor, such as calcium carbonate, borax, can decompose to generate a significant amount of gas evolved, and the green body containing the ceramic material precursor during sintering shrinks, thereby forming a significant amount of microporous pores within the sintered porous matrix 313.

And in some implementations, the above porous substrate 313 includes at least one of alumina, silica, boria, calcia, zirconia, and the like.

And in some implementations, the apparent density of porous substrate 313 is 1g/cm ³～3g/cm³. Wherein the term "apparent density" is a physical term referring to the ratio of the mass to the apparent volume of the object being described. For the above tubular porous substrate 313, since a large number of pores exist inside, the above "apparent density" refers to the ratio of the mass of the tubular porous substrate 313 to the apparent volume of the tubular shape. The apparent density of the porous matrix 313 of the porous alumina ceramic body containing 65% or more porosity is about 1.43g/cm ³, as compared to the density of the alumina dense ceramic material, which typically does not contain pores inside, which is 3.95g/cm ³. Or in still other embodiments, when the porous substrate 313 is made of a porous ceramic material or a porous glass material that meets REACH restriction material standards (e.g., GB/T39498-2020), FDA requirements, and halogen-free standards, the apparent density of the porous substrate 313 is 1.5-2 g/cm ³.

In some implementations, the material of porous matrix 313 has a thermal conductivity of between 1 and 25W/m.K. For example, the thermal conductivity of glass is about 1W/m.K, and the thermal conductivity of alumina ceramic is about 20W/m.K.

And in some implementations, the cavity of the housing 31 is also filled with a filler for filling the gaps outside the porous substrate 313 and the heating coil 32, which is advantageous for improving heat utilization. In some implementations, the filler may include an inorganic glass cement such as sodium silicate, aluminum silicate, and the like; or in still other implementations, the filler may include at least one of glass powder, barium oxide powder, silicon dioxide powder, boron oxide powder, aluminum oxide powder, magnesium oxide powder, and the like; the filler has an initial melting point of not less than 500 ℃ and a thermal expansion coefficient of not less than 8 ppm/DEG C, preferably 10 to 13 ppm/DEG C.

Further FIG. 6 illustrates a temperature field profile of heater 30 as detected by thermal infrared imager FOTRIC, 616 during operation in one embodiment. In the heater 30 to be tested, the length of the housing 31 made of 304 stainless steel was 15mm, the outer diameter was 2.1mm, the length of the tapered tip was 2.5mm, the length of the cavity of the housing 31 was 13mm, and the inner diameter was 1.8mm; the heating coil 32 is made of stainless steel, the number of turns is 9, the length of the heating coil 32 is 9.0+/-0.5 mm, the outer diameter is 1.6mm, the extension dimension of the wire material of the heating coil 32 along the axial direction is 0.8mm, and the extension dimension along the radial direction is 0.2mm; the porous substrate 313 is made of ceramic mixed by porous alumina, silica and boron oxide, the outer diameter of the tubular substrate 31 is 1.4mm, the inner diameter is 0.5mm, and the length is equal to the length of the heating coil 32; the flange 34 is made of PEEK and has a thickness of 3mm. Further referring to FIG. 6, the thermal infrared imager FOTRIC exhibits a temperature field distribution as shown in FIG. 616 when the heater 30 is maintained at 350℃ during heating, the high temperature region (340-350℃ region) is closer to the free front end 311 and has a length D1 of about 4.5 mm.

Further, a comparative graph of the length test result of the high temperature zone when the heater is heated at the same predetermined temperature of 350 c in the comparative example and the example is shown in fig. 7; wherein, in the heater of comparative example 1 in fig. 7, the base is not contained, and the heating coil 32 is directly fitted into the housing 31; a dense matrix of dense alumina and a ceramic mixed with silica and boron oxide was used in the heater of comparative example 2; the porous substrate 313 in the heater of example 1 was made of the same material as that of comparative example 2 and had a porosity of about 60%. The length of the high temperature zone of the heater 30 of example 1, comparative example 1 and comparative example 2 was monitored by thermal infrared imager FOTRIC616,616, 10 samples each were taken and the results were counted. From the statistical result of fig. 7, the length average value of the high temperature region of the heater of comparative example 1 was 3.92mm, and the uniformity difference of 10 samples was large (corresponding to the bar graph of comparative example 1 in fig. 7); the average value of the length of the high temperature region of the heater of comparative example 2 was 4.75mm, and the consistency of 10 samples was better than that of comparative example 1 (corresponding to the bar graph of comparative example 2 in fig. 7); the length average value of the high temperature region of the heater 30 of example 1 was 4.585mm, which was higher than that of comparative example 1 and slightly lower than that of comparative example 2, and the consistency of 10 samples was better than that of comparative example 1 (corresponding to the bar chart of example 1 in fig. 7). Thus, when the porous substrate 313 is present in the heating coil 32, it is advantageous to make the temperature distribution of the heater 30 more uniform for promoting the extension of the high temperature region.

Further fig. 8 shows a schematic diagram of a heating profile of the aerosol-generating article 1000 over a predetermined time in one embodiment. Wherein in fig. 8, the predetermined time is set based on the amount of aerosol that the aerosol-generating article 1000 is capable of generating, and the length of time the user is willing to accept to draw (e.g., about 225 s); the heating profile having a predetermined time includes:

time stage S1 (0-t 1 time, which may be about 10S, for example): quickly heating from room temperature to a first target temperature T1 for preheating; a first target temperature, for example 380 ℃;

Time stage S2 (t 1-t2 time, which may be about 5S, for example): from the first target temperature T1 to a second target temperature T2, for example 350 ℃;

Time stage S3 (t 2-t3 time, which may be, for example, about 210S): the aerosol-generating article 1000 is heated to generate an aerosol for inhalation substantially maintained at the second target temperature T2; after the suction is completed, the power supply to the heater 30 is stopped, and the air is cooled.

Further fig. 9 shows the power consumption monitoring results required to heat 225s to the end of each of the curves shown in fig. 8 under no load (without the aerosol-generating article 1000) with the heaters 30 of comparative example 1, comparative example 2 and example 1, respectively. According to the graph shown in fig. 9, the average power consumption of 10 samples in which the heater without the base body of comparative example 1 completed heating was 137.37mWh, and the difference in power consumption between 10 samples was at most 3.8mWh; the average power consumption of 10 samples heated by the heater containing the dense matrix in comparative example 2 was 141.86mWh, and the difference in power consumption between 10 samples was 2.2mWh at the maximum; the average power consumption of 10 samples heated by the heater containing the porous substrate 313 of the porous ceramic in example 1 was 136.28mWh, and the difference in power consumption between 10 samples was 3.2mWh at the maximum. Thus, when a dense substrate exists in the heating coil 32, more power consumption is required.

Further, the temperature sampling results of the surfaces of the housings 31 of the heaters 30 of comparative example 1, comparative example 2 and example 1 at a distance of 11mm from the free front end 311 during heating are shown in fig. 10; the surface of the housing 31 is the position B1 in fig. 2 at a distance of 11mm from the free front end 311, specifically the position B1 in the preparation of the heater 30 is the position of the injection molded flange 34. As can be seen from the results of fig. 10, the average temperature of the heater 30 of 10 samples in example 1 at the B1 position was 286.15 ℃, the average temperature of the heater 30 of 10 samples lower than that in comparative example 1 at the B1 position was 292.45 ℃, and the average temperature of the heater 30 of 10 samples in comparative example 2 at the B1 position was 292.15 ℃. The temperature of the heater 30 at the B1 position in example 1 was about 6 c lower than the temperatures of comparative example 1 and comparative example 2. And as can also be seen in fig. 6, the temperature of the surface of the flange 34 of zirconia during heating is about 105-110 c.

Further, as can be seen from the above, when the porous substrate 313 of porous ceramic is disposed in the heater 30 in embodiment 1, the span of the high temperature region can be longer, the power consumption can be relatively lower, and the temperature can be transferred to the flange 34 relatively less, which is advantageous for improving the temperature uniformity of the heating region, and reducing the power consumption and the heat transfer to the flange 34.

Further, when the heater 30 of comparative example 1, comparative example 2 and example 1 was combined with the aerosol-generating article 1000, the power consumption monitoring results required for heating 225s to the end of each according to the curve shown in fig. 8 were as follows:

From the results of the above test, the heater 30 of comparative example 2 containing a dense matrix increased in power consumption by about 36J as compared with the heater 30 of comparative example 1 containing no matrix; the heater 30 of example 1 containing the porous substrate 313 was reduced in energy consumption by about 26J as compared with comparative example 2.

It should be noted that the description of the application and the accompanying drawings show preferred embodiments of the application, but are not limited to the embodiments described in the description, and further, that modifications or variations can be made by a person skilled in the art from the above description, and all such modifications and variations are intended to fall within the scope of the appended claims.

Claims

1. An aerosol-generating device configured to heat an aerosol-generating article to generate an aerosol; characterized by comprising the following steps: a heater for insertion into the aerosol-generating article for heating; the heater includes:

A porous matrix extending within the cavity;

2. The aerosol-generating device of claim 1, wherein the porous substrate has an apparent density of between 1g/cm ³～3g/cm³.

3. An aerosol-generating device according to claim 1 or 2, wherein the material of the porous matrix has a thermal conductivity of from 1 to 25W/m.k.

4. An aerosol-generating device according to claim 1 or claim 2, wherein the porous substrate has a porosity of from 30 to 80%.

5. The aerosol-generating device according to claim 1 or 2, wherein the micropores in the porous matrix have a pore size of 10 to 2000 μm.

6. Aerosol-generating device according to claim 1 or 2, characterized in that the porous substrate comprises porous ceramic and/or porous glass.

7. The aerosol-generating device according to claim 1 or 2, wherein the porous matrix does not comprise a simple substance of a metal.

8. An aerosol-generating device according to any one of claims 1 to 3, wherein the heating coil comprises, in an axial direction thereof, a first end adjacent the free front end and a second end adjacent the end;

9. The aerosol-generating device of claim 8, wherein the porous substrate is tubular and defines a through-hole extending longitudinally therethrough;

The first conductive pin is at least partially located within the via.

10. The aerosol-generating device of claim 8, wherein the porous substrate has a wall thickness of greater than 0.2mm.

11. The aerosol-generating device of claim 1 or 2, wherein the heater further comprises:

12. The aerosol generating device of claim 11, wherein the filler comprises at least one of glass powder, barium oxide powder, silica powder, boron oxide powder, alumina powder, or magnesia powder.

13. The aerosol-generating device according to claim 1 or 2, wherein the heating coil is capable of generating heat due to resistive joule heat when a direct current flows therethrough; the heating coil and the housing are thermally conductive to each other such that the housing is capable of heating by receiving heat from the heating coil to heat the aerosol-generating article.

14. Aerosol-generating device according to claim 1 or 2, characterized in that the heating coil is arranged to generate a varying magnetic field when an alternating current is flowing through it;

15. A heater for an aerosol-generating device, comprising:

A porous matrix extending within the cavity;